/* HEADER COMPONENTS */
.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    white-space: nowrap;
    cursor: pointer;
    justify-self: start;
    /* Force Left */
    transition: gap 0.2s ease, transform 0.2s ease;
}

.logo-brand {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: font-size 0.2s ease;
}

.badge-beta {
    display: inline-block;
    background: var(--accent-alpha-subtle);
    color: var(--accent);
    border: 1px solid var(--accent-alpha-strong);
    padding: 0.2rem 0.45rem;
    border-radius: 12px;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.35px;
    text-transform: uppercase;
    line-height: 1.1;
    position: relative;
    top: 2px;
    -webkit-text-fill-color: currentColor;
    background-clip: border-box;
    -webkit-background-clip: border-box;
    transition: transform 0.2s ease, padding 0.2s ease;
}

.nav-tabs {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.45rem;
    width: 100%;
    max-width: 760px;
    background: var(--bg-secondary);
    padding: 0.35rem;
    border-radius: 0.62rem;
    border: 1px solid var(--border);
    justify-self: center;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.15);
    transition: padding 0.2s ease, box-shadow 0.2s ease;
}

.nav-tab {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    padding: 0.7rem 1rem;
    border-radius: 0.45rem;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.24s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1rem;
    white-space: nowrap;
    text-align: center;
    letter-spacing: 0.005em;
    min-height: var(--min-touch);
    transition: all 0.24s cubic-bezier(0.4, 0, 0.2, 1), padding 0.2s ease, font-size 0.2s ease;
}

.nav-tab:hover {
    color: var(--text-primary);
    border-color: var(--border-alpha-medium);
    background: var(--border-alpha);
}

.nav-tab.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent-alpha-strong);
    box-shadow: 0 1px 4px var(--accent-alpha-subtle);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    justify-self: end;
    /* Force Right in Grid */
    transition: gap 0.2s ease;
}

.auth-section {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.28rem;
    border-radius: 999px;
    background: linear-gradient(180deg, var(--bg-overlay), var(--bg-overlay-light));
    border: 1px solid var(--border-alpha);
    box-shadow: inset 0 1px 0 var(--border-white-subtle);
    transition: padding 0.2s ease, gap 0.2s ease;
}

.sign-in-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: white;
    color: #3c4043;
    border: 1px solid #dadce0;
    border-radius: 24px;
    padding: 8px 16px;
    font-family: 'Google Sans', 'Roboto', sans-serif;
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.24s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    min-height: var(--min-touch);
}

.sign-in-btn:hover {
    background-color: #f7fafe;
    box-shadow: 0 1px 3px 1px rgba(60, 64, 67, 0.15);
    transform: translateY(-1px);
}

.sign-in-btn svg {
    display: block;
}

.sign-in-hidden {
    display: none !important;
}

.header-faq-btn {
    min-width: 4.15rem;
    padding: 0.6rem 1rem;
    border-radius: 999px;
    background: linear-gradient(180deg, var(--bg-surface-alt), var(--bg-overlay));
    border: 1px solid var(--border-alpha);
    color: var(--text-primary);
    box-shadow: inset 0 1px 0 var(--border-white-subtle);
}

.header-faq-btn:hover {
    background: linear-gradient(180deg, var(--bg-surface-alt-heavy), var(--bg-overlay-heavy));
    border-color: var(--border-alpha-medium);
    color: var(--text-primary);
}

body.is-scrolled .logo {
    gap: 0.4rem;
}

body.is-scrolled .logo-brand {
    font-size: 1.08rem;
}

body.is-scrolled .badge-beta {
    padding: 0.1rem 0.3rem;
    transform: translateY(-2px);
    font-size: 0.54rem;
}

body.is-scrolled .nav-tabs {
    padding: 0.18rem;
    gap: 0.26rem;
}

body.is-scrolled .nav-tab {
    padding: 0.36rem 0.62rem;
    font-size: 0.83rem;
    min-height: 2.08rem;
    border-radius: 0.34rem;
}

body.is-scrolled .header-actions {
    gap: 0.62rem;
}

body.is-scrolled .auth-section {
    gap: 0.28rem;
    padding: 0.12rem;
}

body.is-scrolled .header-faq-btn {
    min-width: 3.1rem;
    padding: 0.28rem 0.56rem;
    border-radius: 999px;
}

body.is-scrolled .key-status-indicator {
    gap: 0.38rem;
    min-height: 2.08rem;
    padding: 0.34rem 0.7rem;
    font-size: 0.8rem;
}

body.is-scrolled .key-status-dot {
    width: 0.42rem;
    height: 0.42rem;
}

body.is-scrolled .key-connect-btn {
    min-height: 2.08rem;
    padding: 0.34rem 0.72rem;
    font-size: 0.8rem;
}

@media (max-width: 900px) {
    .logo {
        gap: 0.55rem;
    }

    .logo-brand {
        font-size: 1.24rem;
    }

    .badge-beta {
        padding: 0.16rem 0.38rem;
        font-size: 0.58rem;
    }

    .header-actions {
        gap: 0.72rem;
    }

    .auth-section {
        gap: 0.38rem;
        padding: 0.18rem;
        justify-content: flex-end;
        flex-wrap: nowrap;
    }

    .nav-tabs {
        width: min(100%, 680px);
    }

    .nav-tab {
        font-size: 0.9rem;
        padding: 0.6rem 0.65rem;
    }

    .header-faq-btn {
        min-width: 3.5rem;
        padding: 0.48rem 0.78rem;
    }

    .key-status-indicator,
    .key-connect-btn {
        min-height: 2.3rem;
        padding: 0.48rem 0.78rem;
        font-size: 0.82rem;
    }
}

@media (max-width: 640px) {
    .logo {
        gap: 0.42rem;
    }

    .logo-brand {
        font-size: 1.08rem;
    }

    .badge-beta {
        padding: 0.12rem 0.32rem;
        font-size: 0.54rem;
    }

    .header-actions {
        gap: 0.52rem;
    }

    .auth-section {
        gap: 0.28rem;
        padding: 0.14rem;
    }

    .nav-tab {
        font-size: 0.84rem;
        padding: 0.56rem 0.45rem;
    }

    .header-faq-btn {
        min-width: 3.1rem;
        padding: 0.42rem 0.62rem;
    }

    .key-status-indicator,
    .key-connect-btn {
        gap: 0.34rem;
        min-height: 2.12rem;
        padding: 0.42rem 0.62rem;
        font-size: 0.76rem;
    }
}

.btn-reset-header {
    background: transparent;
    border: 1px solid var(--error);
    color: var(--error);
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.24s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    min-height: var(--min-touch);
}

.btn-reset-header:hover {
    background: var(--accent-alpha-subtle);
}

/* CARDS */
.setup-card {
    width: 100%;
    animation: slideIn 0.3s ease-out;
    display: flex;
    justify-content: center;
}

.footer-buffer-setup {
    padding-bottom: clamp(6.15rem, 13vh, 9.15rem);
}

.footer-buffer-faq {
    padding-bottom: clamp(3.4rem, 7.5vh, 5.6rem);
}

.footer-buffer-home {
    padding-bottom: clamp(3.1rem, 6.2vh, 4.9rem);
}

.card {
    --card-accent: var(--accent-alpha-medium);
    background: var(--bg-card-gradient);
    border: 1px solid var(--border-card);
    border-radius: 1rem;
    padding: 2.25rem;
    width: 100%;
    box-shadow: var(--shadow-card);
    box-sizing: border-box;
    position: relative;
    overflow: hidden;
    transition: border-color 0.24s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.24s cubic-bezier(0.4, 0, 0.2, 1), transform 0.24s cubic-bezier(0.4, 0, 0.2, 1);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5rem;
    background:
        linear-gradient(180deg, var(--border-white-subtle) 0%, transparent 28%),
        linear-gradient(180deg, var(--card-accent) 0%, var(--bg-overlay-light) 42%, transparent 100%);
    opacity: 0.24;
    transition: opacity 0.32s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    border: 1px solid transparent;
    box-shadow: inset 0 0 0 1px transparent;
    opacity: 0;
    transition: opacity 0.24s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.24s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.24s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.card:hover {
    border-color: var(--border-alpha-medium);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-1px);
}

.card:hover::before {
    opacity: 0.24;
}

.card:hover::after {
    opacity: 1;
    border-color: var(--accent-alpha-subtle);
    box-shadow: inset 0 0 0 1px var(--border-white-subtle);
}

/* AI Glass Card (Neural Glass) */
.card-ai {
    --card-accent: var(--accent-alpha-strong);
    background: var(--bg-card);
    /* Fallback */
    background: linear-gradient(145deg,
            var(--bg-surface-alt) 0%,
            var(--bg-overlay-heavy) 100%);
    backdrop-filter: blur(12px) saturate(180%);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    border: 1px solid var(--border-alpha);
    border-top: 1px solid var(--border-alpha-medium);
    border-radius: 16px;
    box-shadow: var(--shadow-card);
    transition: transform 0.24s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.24s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.24s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-ai:hover {
    border-color: var(--indigo-500);
    box-shadow: var(--shadow-elevated), 0 0 30px var(--accent-alpha-subtle);
    transform: translateY(-2px);
}

.card h3 {
    margin-top: 0;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
    font-weight: 600;
}

.confirm-dialog-root {
    position: fixed;
    inset: 0;
    z-index: 2200;
    align-items: center;
    justify-content: center;
}

.confirm-dialog-backdrop {
    position: absolute;
    inset: 0;
    background: var(--bg-scrim-heavy);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.confirm-dialog-card {
    position: relative;
    z-index: 1;
    width: min(28rem, calc(100vw - 2rem));
    border: 1px solid var(--border-alpha-medium);
    border-radius: 1rem;
    background: linear-gradient(180deg, var(--bg-overlay-heavy), var(--bg-secondary));
    box-shadow: var(--shadow-elevated);
    padding: 1.25rem;
}

.confirm-dialog-header {
    margin-bottom: 0.65rem;
}

.confirm-dialog-title {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.15rem;
}

.confirm-dialog-message {
    margin: 0 0 1.1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    white-space: pre-line;
}

.confirm-dialog-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

.confirm-dialog-btn {
    appearance: none;
    border: 1px solid transparent;
    border-radius: 0.7rem;
    min-width: 6.75rem;
    padding: 0.75rem 1.25rem;
    font-size: 0.92rem;
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    transition: transform 0.24s cubic-bezier(0.4, 0, 0.2, 1), background 0.24s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.24s cubic-bezier(0.4, 0, 0.2, 1), color 0.24s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.24s cubic-bezier(0.4, 0, 0.2, 1);
    min-height: var(--min-touch);
}

.confirm-dialog-btn:hover {
    transform: translateY(-1px);
}

.confirm-dialog-btn:focus-visible {
    outline: 2px solid var(--accent-alpha-strong);
    outline-offset: 2px;
}

.confirm-dialog-btn-secondary {
    background: var(--bg-overlay);
    border-color: var(--border-alpha-medium);
    color: var(--text-primary);
}

.confirm-dialog-btn-secondary:hover {
    background: var(--bg-surface-alt-heavy);
    border-color: var(--border-alpha-strong);
}

.confirm-dialog-btn-primary {
    background: linear-gradient(135deg, var(--indigo-600), var(--indigo-500));
    border-color: var(--accent-alpha-strong);
    color: #fff;
    box-shadow: 0 10px 24px rgba(79, 70, 229, 0.28);
}

.confirm-dialog-btn-primary:hover {
    filter: brightness(1.08);
}

.confirm-dialog-btn-danger {
    background: linear-gradient(135deg, #dc2626, #ef4444);
    border-color: rgba(239, 68, 68, 0.68);
    color: #fff;
    box-shadow: 0 10px 24px rgba(220, 38, 38, 0.22);
}

.confirm-dialog-btn-danger:hover {
    filter: brightness(1.06);
}

body.confirm-dialog-open {
    overflow: hidden;
}

/* ADVICE CARD STYLES */
.advice-card {
    --card-accent: var(--accent-alpha-strong);
    /* Migrate to card-ai style or keep distinct? Keeping distinct but aligned */
    background: linear-gradient(145deg, var(--bg-surface-alt), var(--bg-overlay-heavy));
    border: 1px solid var(--accent-alpha-medium);
}

/* AI Gradient Text (Generative Glow) */
.ai-gradient-text {
    background: linear-gradient(to right,
            var(--cyan-400),
            var(--indigo-500),
            var(--cyan-400));
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: shine 4s linear infinite;
}

/* AI Button */
.btn-ai {
    background: linear-gradient(135deg, var(--indigo-600), var(--indigo-500));
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    font-weight: 500;
    box-shadow: 0 0 15px var(--accent-alpha-medium);
    cursor: pointer;
    transition: all 0.2s;
}

.btn-ai:hover {
    box-shadow: 0 0 25px var(--accent-alpha-strong);
    filter: brightness(1.1);
    transform: translateY(-2px);
}

/* WORKFLOW STEPS */
.workflow-steps {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: nowrap;
    /* Enforce single line */
    gap: 1rem;
    margin-top: 2rem;
    overflow-x: auto;
    /* Allow horizontal scroll on mobile */
    padding-bottom: 0.5rem;
    /* Space for scrollbar */
}

/* ... existing step item code ... */
.step-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    flex: 1;
    min-width: 140px;
}

.step-icon {
    width: 48px;
    height: 48px;
    background: var(--indigo-500);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin-bottom: 1rem;
    font-size: 1.25rem;
    box-shadow: 0 0 10px var(--accent-glow);
}

.step-text {
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--text-primary);
}

.step-arrow {
    color: var(--text-secondary);
    font-size: 2rem;
}

.step-sub {
    font-size: 0.8rem;
    color: var(--indigo-400);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
    display: block;
    opacity: 0.9;
    margin-bottom: 0.3rem;
}

.step-text strong {
    font-size: 1.1rem;
    display: block;
    margin-bottom: 0rem;
}

@media (max-width: 600px) {
    .step-arrow {
        display: none;
    }

    .workflow-steps {
        flex-direction: column;
        gap: 2rem;
    }
}

/* MATERIAL CARD STYLES */
.material-card {
    --card-accent: rgba(16, 185, 129, 0.78);
    border-top: 4px solid var(--success-green);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: relative;
}

.material-card-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.material-card-topbar h3 {
    margin: 0;
    border-bottom: none;
    padding-bottom: 0;
}

.material-panel {
    position: relative;
}

.panel-fullscreen-btn {
    appearance: none;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    border: 1px solid var(--border-alpha-medium);
    border-radius: 999px;
    background: var(--bg-overlay);
    color: var(--text-secondary);
    padding: 0.55rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    transition: background 0.24s cubic-bezier(0.4, 0, 0.2, 1), color 0.24s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.24s cubic-bezier(0.4, 0, 0.2, 1), transform 0.24s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    min-height: var(--min-touch);
}

.panel-fullscreen-btn:hover {
    background: var(--bg-surface-alt-heavy);
    color: var(--text-primary);
    border-color: var(--border-alpha-strong);
    transform: translateY(-1px);
}

.panel-fullscreen-btn:focus-visible {
    outline: 2px solid var(--accent-alpha-strong);
    outline-offset: 2px;
}

.panel-fullscreen-btn.is-active {
    color: #fff;
    background: linear-gradient(135deg, var(--indigo-600), var(--indigo-500));
    border-color: var(--accent-alpha-strong);
}

.panel-fullscreen-icon {
    flex-shrink: 0;
}

/* ... material grid ... */
.material-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    height: 620px;
    min-height: 0;
    align-items: stretch;
    overflow: hidden;
}

/* Prevent long content from forcing grid columns wider than the card. */
.material-grid > * {
    min-width: 0;
}

.material-expand-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1700;
    background: var(--bg-scrim-heavy);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.summary-section,
.chat-section {
    min-width: 0;
    min-height: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    font-family: var(--font-body);
}

.summary-output-wrap {
    position: relative;
    flex: 1 1 auto;
    width: 100%;
    height: 100%;
    max-width: 100%;
    min-width: 0;
    min-height: 0;
}

.summary-box {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1rem;
    width: 100%;
    height: 100%;
    min-height: 0;
    overflow-y: auto;
    overflow-x: hidden;
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-secondary);
    font-family: var(--font-body);
}

.summary-status {
    margin: 0;
}

.summary-inline-trigger {
    appearance: none;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font: inherit;
    font-weight: 700;
    text-decoration: underline;
    text-underline-offset: 2px;
    cursor: pointer;
    padding: 0;
}

.summary-inline-trigger:hover {
    color: var(--accent);
}

.summary-inline-trigger:focus-visible {
    outline: 2px solid var(--accent-alpha-strong);
    outline-offset: 2px;
    border-radius: 3px;
}

.summary-phase-text {
    min-height: 1.1rem;
    margin: 0 0 0.7rem 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.summary-status-info {
    color: var(--text-secondary);
}

.summary-status-success {
    color: var(--text-primary);
}

.summary-status-error {
    color: var(--error-soft);
}

.summary-status-loading {
    font-style: italic;
    animation: summary-pulse 1.2s ease-in-out infinite;
}

.summary-phase-text.is-flashing {
    animation: summary-pulse 1.2s ease-in-out infinite;
}

@keyframes summary-pulse {
    0%,
    100% {
        opacity: 0.45;
    }

    50% {
        opacity: 1;
    }
}

.summary-output-resizer {
    position: absolute;
    width: 14px;
    height: 14px;
    right: 6px;
    bottom: 6px;
    cursor: nwse-resize;
    opacity: 0.7;
    border-right: 2px solid var(--border-alpha-strong);
    border-bottom: 2px solid var(--border-alpha-strong);
    border-radius: 2px;
    z-index: 2;
}

.summary-output-resizer::after {
    content: '';
    position: absolute;
    right: 2px;
    bottom: 2px;
    width: 7px;
    height: 7px;
    border-right: 2px solid var(--border-alpha-medium);
    border-bottom: 2px solid var(--border-alpha-medium);
}

.summary-meta {
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    opacity: 0.9;
    font-family: var(--font-body);
}

.summary-text {
    color: var(--text-primary);
    overflow-wrap: anywhere;
    word-break: break-word;
    max-width: 100%;
}

.summary-text * {
    max-width: 100%;
}

.summary-text h1,
.summary-text h2,
.summary-text h3,
.chat-msg h1,
.chat-msg h2,
.chat-msg h3 {
    margin: 0.35rem 0 0.5rem 0;
    line-height: 1.25;
    font-family: var(--font-body);
    font-weight: 600;
}

.summary-text h1,
.chat-msg h1 {
    font-size: 1.1rem;
}

.summary-text h2,
.chat-msg h2 {
    font-size: 1rem;
}

.summary-text h3,
.chat-msg h3 {
    font-size: 0.95rem;
}

.summary-text p,
.chat-msg p {
    margin: 0 0 0.45rem 0;
}

.summary-text p:last-child,
.chat-msg p:last-child {
    margin-bottom: 0;
}

.summary-text ul,
.chat-msg ul {
    margin: 0 0 0.45rem 1.1rem;
    padding: 0;
}

.summary-text code,
.chat-msg code {
    background: rgba(148, 163, 184, 0.16);
    padding: 0.1rem 0.25rem;
    border-radius: 0.25rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* Timeline Styles (Learning Pathway) */
.timeline-path {
    position: relative;
    padding-left: 2rem;
    border-left: 2px solid var(--slate-700);
}

.timeline-node {
    position: relative;
    margin-bottom: 2rem;
}

.timeline-node::before {
    content: '';
    position: absolute;
    left: -2.6rem;
    top: 0.25rem;
    width: 1.2rem;
    height: 1.2rem;
    background: var(--slate-900);
    border: 2px solid var(--slate-500);
    border-radius: 50%;
    transition: all 0.3s ease;
}

.timeline-node.active::before {
    background: var(--cyan-400);
    border-color: var(--cyan-400);
    box-shadow: 0 0 10px var(--cyan-400);
}

.timeline-node.completed::before {
    background: var(--success-green);
    border-color: var(--success-green);
}

/* CHAT SECTION */
.chat-section {
    height: 100%;
    min-height: 0;
    overflow: visible;
    display: flex;
    justify-content: center;
}

.material-chat-shell {
    flex: 1 1 auto;
    width: min(100%, 920px);
    min-height: 0;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    margin: 0 auto;
    overflow: visible;
}

.material-card.material-expand-active {
    position: fixed;
    inset: 1rem;
    z-index: 1800;
    margin: 0;
    overflow: hidden;
    box-shadow: var(--shadow-elevated);
}

.material-card.material-expand-active {
    width: auto;
    max-width: none;
    height: auto;
    background: linear-gradient(180deg, var(--bg-overlay-heavy), var(--bg-primary));
}

.material-card.material-expand-active .material-grid {
    flex: 1 1 auto;
    height: auto !important;
    min-height: 0;
}

.material-card.material-expand-active .summary-output-resizer {
    display: none;
}

body.material-expand-open {
    overflow: hidden;
}

.chat-history {
    flex: 1 1 auto;
    min-height: 0;
    width: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 0.75rem;
    overflow-y: auto;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
}

.chat-msg {
    padding: 0.5rem 1rem;
    border-radius: 1rem;
    margin-bottom: 0.5rem;
    max-width: min(100%, 58rem);
    width: auto;
    font-size: 0.9rem;
    line-height: 1.4;
    white-space: normal;
    word-break: break-word;
    overflow-wrap: anywhere;
    font-family: var(--font-body);
}

.chat-msg.ai {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    align-self: flex-start;
    width: auto;
    max-width: min(85%, 58rem);
    border-bottom-left-radius: 2px;
    color: var(--text-primary);
}

.chat-msg.user {
    background: var(--indigo-500);
    color: white;
    align-self: flex-end;
    max-width: min(85%, 40rem);
    margin-left: auto;
    border-bottom-right-radius: 2px;
    box-shadow: none;
}

.chat-msg.user + .chat-msg.ai,
.chat-msg.user + .chat-msg.ai.chat-status {
    margin-top: 0.6rem;
}

.chat-msg.chat-status {
    color: var(--text-muted);
    font-style: italic;
    animation: chat-pulse 1.2s ease-in-out infinite;
    display: inline-flex;
    align-items: center;
    gap: 0.2rem;
}

.chat-status-dots {
    display: inline-flex;
    align-items: center;
    letter-spacing: 0.05em;
}

.chat-status-dots span {
    opacity: 0.25;
    animation: chat-dot-blink 1.15s infinite;
}

.chat-status-dots span:nth-child(2) {
    animation-delay: 0.18s;
}

.chat-status-dots span:nth-child(3) {
    animation-delay: 0.36s;
}

@keyframes chat-pulse {
    0%,
    100% {
        opacity: 0.45;
    }

    50% {
        opacity: 1;
    }
}

@keyframes chat-dot-blink {
    0%,
    80%,
    100% {
        opacity: 0.25;
    }

    40% {
        opacity: 1;
    }
}

.chat-input-area {
    flex: 0 0 auto;
    display: flex;
    gap: 0.5rem;
    align-items: stretch;
    width: min(100%, 58rem);
    max-width: 100%;
    min-width: 0;
    align-self: flex-start;
    overflow: visible;
}

.material-summary-btn {
    position: absolute;
    left: 0.72rem;
    bottom: 1.08rem;
    width: 42px !important;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0;
    border-radius: 50%;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1;
    z-index: 2;
    box-shadow: 0 10px 24px rgba(2, 8, 23, 0.26), inset 0 0 0 1px var(--border-white-subtle);
}

.material-summary-btn:hover {
    color: var(--accent);
}

.material-summary-btn:focus-visible {
    outline: 2px solid var(--accent-alpha-strong);
    outline-offset: 2px;
}

.material-summary-btn:disabled {
    opacity: 0.72;
    cursor: progress;
}

.material-summary-tooltip {
    position: absolute;
    left: 0;
    top: calc(100% + 0.72rem);
    bottom: auto;
    transform: translateY(-4px);
    opacity: 0;
    pointer-events: none;
    white-space: nowrap;
    padding: 0.48rem 0.72rem;
    border-radius: 0.8rem;
    border: 1px solid var(--border-alpha-medium);
    background: linear-gradient(180deg, var(--bg-surface-alt-heavy), var(--bg-overlay-heavy));
    color: var(--text-primary);
    font-size: 0.76rem;
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: 0.01em;
    box-shadow: var(--shadow-card-hover);
    transition: opacity 0.16s ease, transform 0.16s ease;
}

.material-summary-tooltip::after {
    content: '';
    position: absolute;
    left: 1rem;
    bottom: 100%;
    width: 10px;
    height: 10px;
    transform: translateY(55%) rotate(45deg);
    border-top: 1px solid var(--border-alpha-medium);
    border-left: 1px solid var(--border-alpha-medium);
    background: var(--bg-surface-alt-heavy);
}

.material-summary-btn:hover .material-summary-tooltip,
.material-summary-btn:focus-visible .material-summary-tooltip {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 720px) {
    .material-grid {
        height: 560px;
    }
}

.chat-input-wrap {
    position: relative;
    flex: 1 1 auto;
    min-width: 0;
    overflow: visible;
}

#materialGrid.material-grid {
    overflow: visible;
}

#chatInput {
    width: 100%;
    height: 118px;
    min-height: 84px;
    max-height: 360px;
    padding: 0.9rem 1rem 4.1rem 1rem;
    border-radius: 1.2rem;
    border: 1px solid var(--border-alpha-medium);
    background: linear-gradient(180deg, var(--bg-surface-alt), var(--bg-overlay-heavy));
    color: var(--text-primary);
    resize: none;
    overflow-y: auto;
    overflow-x: hidden;
    line-height: 1.5;
    font-family: inherit;
    font-size: 16px !important;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    max-width: 100%;
    box-shadow: inset 0 1px 0 var(--border-white-subtle);
}

#chatInput:focus,
#chatInput:focus-visible {
    outline: none;
    border-color: var(--accent-alpha-strong);
    box-shadow: 0 0 0 3px var(--accent-alpha-subtle);
}

/* Keep rendered display math inside cards by allowing local horizontal scroll. */
.summary-box .katex-display,
.chat-history .katex-display {
    overflow-x: auto;
    overflow-y: hidden;
    max-width: 100%;
}

.btn-icon {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 0.6rem 0.8rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    transition: all 0.2s ease;
}

.btn-icon:hover {
    background: var(--border-alpha);
    color: var(--text-primary);
    border-color: var(--border-alpha-strong);
}

/* FAQ CARD */
.faq-card {
    --card-accent: rgba(245, 158, 11, 0.75);
    border-top: 4px solid var(--warning-amber);
}

.faq-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.faq-item {
    margin: 0;
    padding: 1rem 1.1rem;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    background: linear-gradient(180deg, var(--bg-overlay-light), var(--bg-surface-alt));
    min-height: 130px;
    transition: border-color 0.2s ease, background 0.2s ease;
}

.faq-item:hover {
    border-color: color-mix(in srgb, var(--warning-amber) 45%, transparent);
    background: linear-gradient(180deg, var(--bg-surface-alt), var(--bg-surface-alt-heavy));
}

.faq-item h4 {
    margin: 0 0 0.45rem 0;
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.35;
}

.faq-item p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.45;
}

@media (max-width: 980px) {
    .faq-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .faq-list {
        grid-template-columns: 1fr;
    }

    .faq-item {
        min-height: 0;
    }
}

/* FILE MANAGER STYLES */
.file-card {
    --card-accent: rgba(99, 102, 241, 0.78);
    border-top: 4px solid var(--indigo-500);
}

.file-list-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1rem;
}

.file-item {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    transition: border-color 0.2s ease, background 0.2s ease;
}

.file-item-enhanced {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--accent);
}

.file-link {
    flex-grow: 1;
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: 1rem;
}

.file-link:hover {
    color: var(--cyan-400);
    text-decoration: underline;
}

.toggle-label.file-enhanced-toggle {
    margin: 0;
    padding: 0.32rem 0.5rem;
    gap: 0.45rem;
    border: 1px solid var(--border);
    border-radius: 0.55rem;
    background: var(--bg-overlay-light);
    color: var(--text-secondary);
    font-size: 0.78rem;
    line-height: 1;
}

.toggle-label.file-enhanced-toggle:hover {
    background: var(--bg-surface-alt);
}

.toggle-label.file-enhanced-toggle.active {
    color: var(--accent);
    border-color: var(--accent-alpha-strong);
    background: var(--accent-alpha-subtle);
}

.toggle-label.file-enhanced-toggle .toggle-input {
    width: 38px;
    height: 21px;
}

.toggle-label.file-enhanced-toggle .toggle-input::after {
    top: 2px;
    left: 2px;
    width: 15px;
    height: 15px;
}

.toggle-label.file-enhanced-toggle .toggle-input:checked::after {
    transform: translateX(17px);
}

.file-enhanced-text {
    font-weight: 600;
    letter-spacing: 0.01em;
}

.upload-zone-mini {
    border: 2px dashed var(--border);
    padding: 1.15rem 1.25rem;
    text-align: center;
    border-radius: 0.85rem;
    cursor: pointer;
    background: linear-gradient(135deg, var(--bg-overlay), var(--bg-surface-alt));
    transition: border-color 0.24s cubic-bezier(0.4, 0, 0.2, 1), transform 0.24s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.24s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
}

.upload-zone-mini:hover {
    border-color: var(--accent-alpha-strong);
    transform: translateY(-1px);
    box-shadow: var(--shadow-card-hover);
}


/* SCIENCE / ADVICE GRID */
.science-item {
    background: linear-gradient(160deg, var(--bg-overlay), var(--bg-surface-alt));
    border: 1px solid var(--border-card);
    border-radius: 0.9rem;
    padding: 1.5rem;
    box-shadow: var(--shadow-card);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.science-item:hover {
    border-color: var(--accent-alpha-medium);
    background: linear-gradient(160deg, var(--bg-surface-alt), var(--bg-surface-alt-heavy));
    box-shadow: var(--shadow-card-hover);
}

.science-item.active {
    border-color: var(--accent);
    background: linear-gradient(160deg, var(--bg-surface-alt-heavy), var(--bg-overlay-heavy));
    box-shadow: var(--shadow-card-hover);
}

.science-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.science-header h4 {
    color: var(--accent);
    margin: 0;
    font-size: 1.1rem;
}

.science-sub {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-weight: bold;
    display: block;
    margin-top: 0.25rem;
    transition: color 0.2s;
}

.science-item.active .science-sub {
    color: var(--text-primary);
}

.toggle-icon {
    font-size: 1.2rem;
    color: var(--text-secondary);
    transition: transform 0.3s ease;
}

.science-item.active .toggle-icon {
    transform: rotate(180deg);
    color: var(--accent);
}

.science-details {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: all 0.4s ease-out;
    margin-top: 0;
}

.science-item.active .science-details {
    max-height: 300px;
    /* ample space */
    opacity: 1;
    margin-top: 1rem;
    border-top: 1px solid var(--border-white-subtle);
    padding-top: 1rem;
}

.science-details p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.citation-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-primary);
    text-decoration: none;
    background: var(--border-white-subtle);
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    transition: background 0.2s;
}

.citation-link:hover {
    background: var(--accent-alpha-subtle);
    color: var(--accent);
}

/* BUILDER / QUIZ CARD */
.builder-stage {
    position: relative;
}

.builder-card {
    --card-accent: rgba(167, 139, 250, 0.78);
    border-top: 4px solid #a78bfa;
}

.builder-title-group {
    margin-bottom: 1.35rem;
    max-width: 320px;
}

.builder-title-input {
    max-width: 320px;
}

.builder-config-layout {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem 1.75rem;
    margin-bottom: 1.6rem;
    align-items: stretch;
}

.builder-config-column {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-width: 0;
}

.builder-panel {
    margin: 0;
    padding: 0.85rem 1rem;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    background: linear-gradient(180deg, var(--bg-overlay-light), var(--bg-surface-alt));
}

.builder-panel label {
    margin-bottom: 0.45rem;
}

.builder-panel input[type="range"] {
    margin-top: 0.2rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.form-group {
    margin-bottom: 1rem;
}

.builder-count-grid {
    margin-bottom: 0;
    gap: 0.9rem;
}

.builder-count-grid .form-group {
    margin-bottom: 0;
}

.builder-limit-note {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.35rem;
}

.builder-output-toggle {
    margin-top: 0;
}

.builder-output-select {
    margin: 0.85rem 0 0;
}

.builder-select {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 0.65rem;
    background: var(--bg-input);
    color: var(--text-primary);
    padding: 0.7rem 0.8rem;
    font: inherit;
}

.builder-select:focus,
.builder-select:focus-visible {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 2px var(--accent-alpha-subtle);
}

.builder-output-title {
    color: var(--text-secondary);
    font-size: 0.86rem;
    margin-bottom: 0.45rem;
    font-weight: 500;
}

.builder-toggle-label {
    padding: 0;
    margin: 0;
    align-items: flex-start;
    color: var(--text-primary);
    font-size: 0.9rem;
    line-height: 1.35;
}

.builder-toggle-label:hover {
    background: transparent;
}

.builder-toggle-label .toggle-input {
    margin-top: 1px;
}

.builder-toggle-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1rem;
    margin-top: 0.5rem;
}

.builder-toggle-row .toggle-label {
    margin: 0;
    border: 1px solid var(--border);
    background: var(--bg-overlay-light);
    padding: 0.5rem 0.65rem;
}

.builder-toggle-row .toggle-label:hover {
    background: var(--bg-surface-alt);
}

.builder-instructions-panel {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.builder-section-label {
    font-weight: 600;
    color: var(--text-primary);
}

.builder-textarea {
    flex-grow: 1;
    width: 100%;
    min-height: 220px;
    border-radius: 0.65rem;
    padding: 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    resize: vertical;
    box-sizing: border-box;
    line-height: 1.55;
}

.builder-actions {
    margin-top: 1.4rem;
    width: 100%;
    display: flex;
    justify-content: center;
}

.builder-actions .btn {
    max-width: 340px;
}

@media (max-width: 900px) {
    .builder-title-group {
        max-width: none;
    }

    .builder-title-input {
        max-width: none;
    }

    .builder-config-layout {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .builder-textarea {
        min-height: 180px;
    }

    .builder-actions .btn {
        max-width: none;
    }
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

input[type="range"],
input[type="number"],
input[type="text"] {
    width: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 0.5rem;
    box-sizing: border-box;
}

/* BUTTONS */
.btn {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--accent);
    color: white;
    box-shadow: 0 0 15px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 25px var(--accent-glow);
}

.btn-infinite {
    background: linear-gradient(135deg, #ec4899, #8b5cf6);
    color: white;
}

.btn-infinite:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 25px rgba(236, 72, 153, 0.5);
}

.btn-reset {
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.35);
    color: rgba(239, 68, 68, 0.78);
    cursor: pointer;
    border-radius: 0.5rem;
    font-weight: 500;
    box-shadow: none;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn-reset:hover {
    background: rgba(239, 68, 68, 0.12);
    color: rgba(239, 68, 68, 0.88);
    border-color: rgba(239, 68, 68, 0.5);
}

.btn-back {
    background: rgba(148, 163, 184, 0.08);
    border: 1px solid rgba(148, 163, 184, 0.35);
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 0.5rem;
    font-weight: 500;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn-back:hover {
    background: rgba(148, 163, 184, 0.14);
    color: var(--text-primary);
    border-color: rgba(148, 163, 184, 0.6);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
}

.btn-secondary:hover {
    background: var(--accent-alpha-subtle);
}

.btn-ghost {
    background: var(--bg-overlay-light);
    color: var(--text-primary);
    border: 1px solid var(--border-alpha-medium);
    padding: 0.625rem 1.25rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.24s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    min-height: var(--min-touch);
}

.btn-ghost:hover {
    background: var(--bg-secondary);
    color: var(--accent);
    border-color: var(--accent);
    box-shadow: 0 0 10px var(--accent-alpha-subtle);
}

#helpToolbar .btn-ghost {
    width: var(--min-touch) !important;
    height: var(--min-touch) !important;
    padding: 0 !important;
    justify-content: center;
}

@keyframes glowPulse {

    0%,
    100% {
        box-shadow: 0 0 5px rgba(16, 185, 129, 0.1);
    }

    50% {
        box-shadow: 0 0 15px rgba(16, 185, 129, 0.3);
    }
}

.btn-close-help:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

@keyframes pulseBlue {

    0%,
    100% {
        box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
    }

    50% {
        box-shadow: 0 0 25px rgba(59, 130, 246, 0.6);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-up {
    animation: fadeInUp 0.6s ease-out backwards;
}

@keyframes shine {
    to {
        background-position: 200% center;
    }
}

@keyframes shake-red {

    0%,
    100% {
        transform: translateX(0);
        border-color: var(--border);
    }

    25% {
        transform: translateX(-3px);
        border-color: #ef4444;
        box-shadow: 0 0 5px rgba(239, 68, 68, 0.3);
    }

    75% {
        transform: translateX(3px);
        border-color: #ef4444;
        box-shadow: 0 0 5px rgba(239, 68, 68, 0.3);
    }
}

.shake-red {
    animation: shake-red 0.3s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
}

/* HERO SECTION */
.hero-section {
    text-align: center;
    padding: 2.5rem 1rem 0.5rem 1rem;
    animation: fadeInUp 0.6s ease-out;
    position: relative;
}

.badge-free {
    display: inline-block;
    background: color-mix(in srgb, var(--success) 10%, transparent);
    /* reduced bg opacity */
    color: var(--success);
    border: 1px solid color-mix(in srgb, var(--success) 60%, transparent);
    /* reduced border opacity */
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin: 0;
    line-height: 1.1;
    letter-spacing: -1px;
    background: var(--gradient-hero-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 8px var(--accent-alpha-medium));
}

.option.option-correct {
    background: var(--feedback-correct-bg);
    border-color: var(--feedback-correct-border);
}

.option.option-wrong {
    background: var(--feedback-wrong-bg);
    border-color: var(--feedback-wrong-border);
}

#statusText.status-glow-success {
    color: var(--success);
    text-shadow: var(--status-glow-success);
}

#statusText.status-glow-blue {
    color: var(--cyan-400);
    text-shadow: var(--status-glow-blue);
}

#statusText.status-glow-warning {
    color: var(--warning-amber);
    text-shadow: var(--status-glow-warning);
}

@media (prefers-color-scheme: light) {
    .badge-beta {
        background: rgba(79, 70, 229, 0.08);
        color: #4338ca;
        border-color: rgba(79, 70, 229, 0.28);
    }

    .badge-free {
        background: rgba(16, 185, 129, 0.12);
        color: #047857;
        border-color: rgba(16, 185, 129, 0.32);
    }

    .btn-ai {
        box-shadow: 0 10px 22px -18px rgba(79, 70, 229, 0.55);
    }

    .btn-ai:hover {
        box-shadow: 0 16px 28px -20px rgba(79, 70, 229, 0.5);
    }

    .logo-text {
        filter: drop-shadow(0 0 4px rgba(79, 70, 229, 0.16));
    }

    #statusText.status-glow-success,
    #statusText.status-glow-blue,
    #statusText.status-glow-warning {
        text-shadow: none;
    }

    ::-webkit-scrollbar-thumb {
        background: #cbd5e1;
    }
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin: 1.5rem auto 2rem auto;
    font-weight: 400;
    max-width: 700px;
    line-height: 1.6;
}

.highlight {
    color: var(--accent);
    font-weight: 600;
}

.btn-hero {
    font-size: 1.1rem;
    padding: 1rem 4rem;
    border-radius: 50px;
    border: none;
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
    transition: all 0.24s cubic-bezier(0.4, 0, 0.2, 1);
    min-width: 280px;
    letter-spacing: 0.5px;
    animation: pulseBlue 3s infinite ease-in-out;
}

.btn-hero:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.6);
}

/* Typewriter Effect */
.typewriter {
    display: inline-block;
    overflow: hidden;
    white-space: nowrap;
    margin: 0 auto;
    border-right: .15em solid transparent;
    /* Default: INVISIBLE */
    max-width: fit-content;
    animation:
        typing 3.5s steps(60, end),
        blink-caret .5s step-end 6;
    /* 3.0s total - Stops before typing ends */
}

@keyframes typing {
    from {
        width: 0
    }

    to {
        width: 100%
    }
}

@keyframes blink-caret {

    from,
    to {
        border-color: transparent
    }

    50% {
        border-color: var(--accent)
    }
}

@media (max-width: 600px) {
    .typewriter {
        white-space: normal;
        border-right: none;
        animation: fadeInUp 0.6s ease-out;
        width: auto;
    }
}

/* Quiz Footer Controls */
.quiz-footer {
    background: var(--bg-primary);
    padding: 0.5rem 1rem;
    border-radius: 99px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    animation: fadeInUp 0.3s ease-out;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--hover);
    color: var(--text-primary);
}

.btn-success {
    background: var(--success);
    color: white;
    border: 1px solid var(--success);
}

.btn-success:hover {
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.4);
}

.btn-danger {
    background: #ef4444;
    color: white;
    border: 1px solid #ef4444;
}

.btn-danger:hover {
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.4);
}

.btn-danger-ghost {
    background: transparent;
    color: var(--error);
    border: 1px solid var(--error);
}

.btn-danger-ghost:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--error);
}

.btn-success-ghost {
    background: transparent;
    color: var(--success);
    border: 1px solid var(--success);
}

.btn-success-ghost:hover {
    background: rgba(34, 197, 94, 0.1);
    border-color: var(--success);
}

/* Card Height Adjustment for Review */
.q-card-interactive {
    min-height: auto;
    /* Fit content */
    width: 100%;
    padding: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

/* Animated Loading Bar (Scanner) */
.weighted-loader {
    width: 100%;
    height: 4px;
    background: rgba(59, 130, 246, 0.1);
    position: relative;
    overflow: hidden;
    border-radius: 4px;
}

.weighted-loader::after {
    content: '';
    position: absolute;
    width: 30%;
    height: 100%;
    background: linear-gradient(90deg, transparent, #3b82f6, transparent);
    animation: scanner 1.5s infinite ease-in-out;
    transform: translateX(-100%);
}

@keyframes scanner {
    0% {
        transform: translateX(-100%);
    }

    100% {
        transform: translateX(400%);
    }
}

/* Stats Ratio Bar */
.stats-bar {
    width: 100%;
    height: 8px;
    /* Thicker than loader */
    background: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
    display: flex;
    margin-top: 1rem;
}

.stat-segment {
    height: 100%;
    transition: flex 0.3s ease;
}

.stat-segment.correct {
    background: var(--success);
}

.stat-segment.wrong {
    background: #ef4444;
}

.stat-segment.skip {
    background: #3b82f6;
}

/* Blue */
.stat-segment.queue {
    background: #94a3b8;
}

/* Status Pills (Scoreboard) */
.stat-pill {
    padding: 0.25rem 0.75rem;
    border-radius: 99px;
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.stat-pill.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.stat-pill.danger {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.stat-pill.neutral {
    background: rgba(148, 163, 184, 0.1);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

/* Visual Bar */
.visual-bar {
    height: 8px;
    width: 200px;
    background: var(--bg-primary);
    border-radius: 4px;
    overflow: hidden;
}

.batch-progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background-color: var(--success);
    background-image: linear-gradient(45deg,
            rgba(255, 255, 255, 0.15) 25%,
            transparent 25%,
            transparent 50%,
            rgba(255, 255, 255, 0.15) 50%,
            rgba(255, 255, 255, 0.15) 75%,
            transparent 75%,
            transparent);
    background-size: 20px 20px;
    animation: progress-stripes 1s linear infinite;
    box-shadow: 0 0 12px rgba(16, 185, 129, 0.4);
    transition: width 0.25s ease;
    z-index: 5;
}

.weighted-loader-bottom {
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

/* Blue loading stripes */
.loader-scan-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    /* Full Width */
    height: 100%;
    background-color: var(--accent);
    /* Base Blue */
    background-image: linear-gradient(45deg,
            rgba(255, 255, 255, 0.15) 25%,
            transparent 25%,
            transparent 50%,
            rgba(255, 255, 255, 0.15) 50%,
            rgba(255, 255, 255, 0.15) 75%,
            transparent 75%,
            transparent);
    background-size: 20px 20px;
    animation: progress-stripes 1s linear infinite;
    box-shadow: none;
    /* Remove glow if clean look desired, or keep */
}

@keyframes progress-stripes {
    from {
        background-position: 20px 0;
    }

    to {
        background-position: 0 0;
    }
}

@keyframes flashGreen {
    0% {
        box-shadow: inset 0 0 0 0 rgba(0, 255, 100, 0);
    }

    30% {
        box-shadow: inset 0 0 150px 40px rgba(0, 255, 100, 0.15);
    }

    100% {
        box-shadow: inset 0 0 0 0 rgba(0, 255, 100, 0);
    }
}

.correct-flash {
    animation: flashGreen 1s ease-out;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

/* Gray */

/* Modern Toggle Switch */
.toggle-label {
    position: relative;
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
    gap: 0.75rem;
    padding: 0.5rem;
    border-radius: 8px;
    transition: background 0.2s;
}

.toggle-label:hover {
    background: var(--bg-secondary);
}

.toggle-input {
    appearance: none;
    -webkit-appearance: none;
    width: 44px;
    height: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 99px;
    position: relative;
    transition: all 0.3s ease;
    cursor: pointer;
    flex-shrink: 0;
}

.toggle-input::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: var(--text-secondary);
    border-radius: 50%;
    transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.toggle-input:checked {
    background: var(--accent);
    border-color: var(--accent);
}

.toggle-input:checked::after {
    background: white;
    transform: translateX(20px);
}

/* Option Letters */
.opt-letter {
    font-weight: 700;
    color: var(--accent);
    margin-right: 0.5rem;
}

/* API KEY GATE */
.api-key-card {
    --card-accent: rgba(99, 102, 241, 0.72);
    width: 100%;
    max-width: 760px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.setup-stage {
    flex-direction: column;
    gap: 1.5rem;
}

.setup-hero-section {
    padding-top: 0;
}

.setup-hero-title {
    font-size: clamp(2.1rem, 3.9vw, 2.8rem);
}

.setup-hero-subtitle {
    margin-top: 0.8rem;
    margin-bottom: 0.8rem;
    max-width: none;
    white-space: nowrap;
    font-size: 1.05rem;
}

.api-key-title {
    margin: 0;
    padding: 0;
    border: none;
    display: flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 1.45rem;
}

.api-key-card .api-key-title {
    border-bottom: 1px solid var(--border-alpha-strong);
}

.api-key-subtitle {
    margin: 0;
    max-width: none;
    color: var(--text-secondary);
}

.key-setup-alert {
    display: grid;
    gap: 0.28rem;
    padding: 0.85rem 0.95rem;
    border-radius: 0.85rem;
    border: 1px solid rgba(251, 191, 36, 0.36);
    background: linear-gradient(180deg, rgba(251, 191, 36, 0.16), var(--bg-overlay-light));
    color: var(--text-primary);
}

.key-setup-alert strong {
    font-size: 0.96rem;
    font-weight: 700;
}

.key-setup-alert span {
    color: var(--text-secondary);
    line-height: 1.45;
}

.key-steps {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.key-step {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 0.72rem;
    padding: 0.62rem 0.75rem;
    background: linear-gradient(180deg, var(--bg-overlay-light), var(--bg-surface-alt));
}

.key-step-text {
    display: inline-block;
}

.key-step-copy {
    display: grid;
    gap: 0.22rem;
    flex: 1 1 auto;
    min-width: 0;
}

.key-step-title {
    font-weight: 700;
    line-height: 1.35;
}

.key-step-inline-link {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.key-step-inline-link:hover,
.key-step-inline-link:focus-visible {
    color: var(--indigo-600);
}

.key-step-detail {
    color: var(--text-secondary);
    line-height: 1.45;
}

.key-step-num {
    width: 1.32rem;
    height: 1.32rem;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.76rem;
    font-weight: 700;
    color: white;
    background: var(--accent);
    flex-shrink: 0;
    margin-top: 0.1rem;
}

.key-step-link-btn {
    width: 1.95rem;
    height: 1.95rem;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.key-step-link-btn svg {
    display: block;
}

.key-step-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    width: fit-content;
    min-height: 2.15rem;
    margin-top: 0.3rem;
    padding: 0.55rem 0.8rem;
    border: 1px solid var(--accent-alpha-medium);
    border-radius: 0.68rem;
    background: linear-gradient(180deg, var(--accent-alpha-subtle), var(--bg-surface-alt));
    color: var(--accent);
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.key-step-cta:hover,
.key-step-cta:focus-visible {
    border-color: var(--accent-alpha-strong);
    background: linear-gradient(180deg, var(--accent-alpha-subtle), var(--bg-surface-alt-heavy));
    transform: translateY(-1px);
    outline: none;
}

.key-step-cta svg {
    flex-shrink: 0;
}

.key-step-free {
    margin-bottom: 0;
    margin-left: 0.1rem;
    align-self: center;
    padding: 0.16rem 0.56rem;
    font-size: 0.72rem;
    line-height: 1.1;
    white-space: nowrap;
}

.key-input-wrap {
    position: relative;
}

.key-locked-display {
    min-height: 3.02rem;
    padding: 0.95rem 0.85rem;
    border-radius: 0.7rem;
    border: 1px solid rgba(16, 185, 129, 0.88);
    background: color-mix(in srgb, var(--success) 12%, transparent);
    color: color-mix(in srgb, var(--success) 72%, var(--text-primary));
    font-size: 0.95rem;
    font-weight: 600;
    align-items: center;
    flex: 1 1 auto;
    min-width: 0;
    overflow-x: auto;
    word-break: break-all;
}

.key-connected-row {
    display: flex;
    align-items: center;
    gap: 0.52rem;
}

.key-connected-actions {
    display: inline-flex;
    align-items: center;
    gap: 0.42rem;
}

.key-input-help {
    margin: 0.55rem 0 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.45;
}

.key-input {
    width: 100%;
    padding: 0.95rem 4.7rem 0.95rem 0.85rem;
    border-radius: 0.7rem;
    border: 1px solid var(--border);
    background: var(--bg-input);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.16s ease, box-shadow 0.16s ease, background 0.16s ease;
}

.key-input:focus,
.key-input:focus-visible {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-alpha-subtle);
}

.key-input.is-valid {
    border-color: rgba(16, 185, 129, 0.88);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.21);
}

.key-input.is-invalid {
    border-color: rgba(239, 68, 68, 0.95);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}

.key-checkmark {
    position: absolute;
    right: 2.7rem;
    top: 50%;
    transform: translateY(-50%) scale(0.82);
    transform-origin: center;
    opacity: 0;
    color: var(--success);
    font-size: 1.06rem;
    font-weight: 700;
    pointer-events: none;
}

.key-input.is-valid + .key-checkmark {
    opacity: 1;
    transform: translateY(-50%) scale(1);
    animation: key-check-pop 0.2s ease-out;
}

.key-visibility-toggle {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.8rem;
    height: 1.8rem;
    border: 1px solid var(--border);
    border-radius: 0.45rem;
    background: var(--border-alpha);
    color: var(--text-secondary);
    cursor: pointer;
    transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.key-visibility-toggle:hover {
    background: var(--border-alpha-medium);
    color: var(--text-primary);
    border-color: var(--border-alpha-strong);
}

.key-visibility-toggle:focus,
.key-visibility-toggle:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--accent-alpha-subtle);
}

.key-visibility-toggle .icon-eye-off {
    display: none;
}

.key-visibility-toggle.is-visible .icon-eye {
    display: none;
}

.key-visibility-toggle.is-visible .icon-eye-off {
    display: block;
}

.key-connected-actions .key-visibility-toggle {
    position: static;
    transform: none;
    right: auto;
    top: auto;
}

@keyframes key-check-pop {
    from {
        opacity: 0;
        transform: translateY(-50%) scale(0.68);
    }

    to {
        opacity: 1;
        transform: translateY(-50%) scale(1);
    }
}

.api-key-card-actions {
    display: flex;
    justify-content: flex-start;
}

.key-trust-note {
    margin: 0;
    max-width: none;
    color: var(--text-muted);
    font-size: 0.84rem;
}

.key-delete-btn {
    margin-top: 0;
    white-space: nowrap;
}

.key-status-indicator {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: var(--min-touch);
    padding: 0.58rem 0.95rem;
    border-radius: 999px;
    border: 1px solid rgba(52, 211, 153, 0.4);
    background: linear-gradient(180deg, color-mix(in srgb, var(--success) 16%, transparent), var(--bg-surface-alt));
    color: color-mix(in srgb, var(--success) 78%, var(--text-primary));
    font-size: 0.9rem;
    font-weight: 700;
    line-height: 1;
    letter-spacing: 0.01em;
    box-shadow: inset 0 1px 0 var(--border-white-subtle);
}

.key-status-dot {
    width: 0.52rem;
    height: 0.52rem;
    border-radius: 999px;
    background: var(--success);
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.35);
}

.key-connect-btn {
    border: 1px solid var(--border-alpha-strong);
    border-radius: 999px;
    background: linear-gradient(180deg, var(--bg-surface-alt), var(--bg-overlay));
    color: var(--text-primary);
    padding: 0.58rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.24s cubic-bezier(0.4, 0, 0.2, 1), background 0.24s cubic-bezier(0.4, 0, 0.2, 1), color 0.24s cubic-bezier(0.4, 0, 0.2, 1);
    min-height: var(--min-touch);
    box-shadow: inset 0 1px 0 var(--border-white-subtle);
}

.key-connect-btn:hover {
    border-color: var(--accent-alpha-strong);
    color: var(--accent);
    background: var(--accent-alpha-subtle);
}

.key-status-link {
    cursor: pointer;
    transition: border-color 0.24s cubic-bezier(0.4, 0, 0.2, 1), background 0.24s cubic-bezier(0.4, 0, 0.2, 1), color 0.24s cubic-bezier(0.4, 0, 0.2, 1), transform 0.24s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.24s cubic-bezier(0.4, 0, 0.2, 1);
}

.key-status-link:hover {
    background: linear-gradient(180deg, color-mix(in srgb, var(--success) 20%, transparent), var(--bg-surface-alt-heavy));
    color: color-mix(in srgb, var(--success) 82%, var(--text-primary));
    border-color: rgba(110, 231, 183, 0.62);
    transform: translateY(-1px);
    box-shadow: 0 10px 24px rgba(6, 95, 70, 0.12);
}

.key-status-link:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(110, 231, 183, 0.18);
}

.btn-secondary-sm {
    border: 1px solid rgba(96, 165, 250, 0.56);
    border-radius: 0.58rem;
    background: rgba(59, 130, 246, 0.08);
    color: #bfdbfe;
    padding: 0.56rem 0.9rem;
    font-size: 0.87rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.16s ease, background 0.16s ease, color 0.16s ease;
}

.btn-secondary-sm:hover {
    border-color: rgba(147, 197, 253, 0.9);
    background: rgba(30, 64, 175, 0.22);
    color: #dbeafe;
}

.key-setup-highlight {
    animation: key-setup-pulse 1.35s ease;
}

@keyframes key-setup-pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(59, 130, 246, 0);
        border-color: var(--border);
    }

    40% {
        box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
        border-color: rgba(96, 165, 250, 0.85);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(59, 130, 246, 0);
        border-color: var(--border);
    }
}

@media (max-width: 900px) {
    .api-key-card {
        padding: 1.35rem;
    }

    .setup-hero-subtitle {
        white-space: normal;
        font-size: 1rem;
    }

    .key-status-indicator {
        justify-content: center;
    }
}

/* End of File */