:root {
    color-scheme: light dark;
    --color-background: #f8fafc;
    --color-background-tint-top: rgba(99, 102, 241, 0.08);
    --color-background-tint-side: rgba(241, 245, 249, 0.92);
    --color-surface: rgba(255, 255, 255, 0.96);
    --color-surface-strong: #ffffff;
    --color-surface-muted: #f1f5f9;
    --color-surface-secondary: #ffffff;
    --color-surface-edge: rgba(255, 255, 255, 0.7);
    --color-border: rgba(148, 163, 184, 0.22);
    --color-border-strong: rgba(148, 163, 184, 0.36);
    --color-border-soft: rgba(226, 232, 240, 0.94);
    --color-text-strong: #0f172a;
    --color-text-muted: #475569;
    --color-label-muted: #475569;
    --color-primary: #4f46e5;
    --color-primary-hover: #4338ca;
    --color-primary-foreground: #ffffff;
    --color-link: #4338ca;
    --color-pill-text: #4338ca;
    --color-support-text: #4f46e5;
    --color-accent-surface: rgba(79, 70, 229, 0.08);
    --color-accent-border: rgba(79, 70, 229, 0.12);
    --color-brand-ring-shadow: rgba(15, 23, 42, 0.12);
    --color-preview-shell: #111827;
    --color-preview-border: rgba(15, 23, 42, 0.08);
    --color-preview-toolbar-bg: #f8fafc;
    --color-preview-toolbar-border: rgba(15, 23, 42, 0.08);
    --color-preview-toolbar-text: #475569;
    --color-preview-frame-loading: #eef2f7;
    --color-focus-ring: #ff9f1c;
    --shadow-elevation: 0 14px 34px rgba(15, 23, 42, 0.06);
    --radius-large: 20px;
    --radius-medium: 14px;
    --font-body: Inter, "Avenir Next", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: Inter, "Avenir Next", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-background: #141417;
        --color-background-tint-top: rgba(99, 102, 241, 0.18);
        --color-background-tint-side: rgba(39, 39, 46, 0.78);
        --color-surface: rgba(30, 30, 36, 0.96);
        --color-surface-strong: #1b1b21;
        --color-surface-muted: #2b2b34;
        --color-surface-secondary: #24242c;
        --color-surface-edge: rgba(255, 255, 255, 0.05);
        --color-border: rgba(113, 113, 122, 0.46);
        --color-border-strong: rgba(165, 180, 252, 0.24);
        --color-border-soft: rgba(63, 63, 70, 0.82);
        --color-text-strong: #fafafa;
        --color-text-muted: #b8b8c6;
        --color-label-muted: #a1a1aa;
        --color-primary: #4f46e5;
        --color-primary-hover: #6366f1;
        --color-primary-foreground: #ffffff;
        --color-link: #c7d2fe;
        --color-pill-text: #c7d2fe;
        --color-support-text: #c7d2fe;
        --color-accent-surface: rgba(99, 102, 241, 0.16);
        --color-accent-border: rgba(165, 180, 252, 0.18);
        --color-brand-ring-shadow: rgba(99, 102, 241, 0.28);
        --color-preview-shell: #0b0b10;
        --color-preview-border: rgba(113, 113, 122, 0.6);
        --color-preview-toolbar-bg: #1b1b21;
        --color-preview-toolbar-border: rgba(255, 255, 255, 0.06);
        --color-preview-toolbar-text: #b8b8c6;
        --color-preview-frame-loading: #0f0f13;
        --shadow-elevation: 0 18px 44px rgba(0, 0, 0, 0.38);
    }
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    min-height: 100%;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at top right, var(--color-background-tint-top), transparent 34%),
        radial-gradient(circle at left center, var(--color-background-tint-side), transparent 40%),
        linear-gradient(180deg, var(--color-background) 0%, var(--color-background) 100%);
    color: var(--color-text-strong);
    font-family: var(--font-body);
    line-height: 1.6;
}

.page {
    width: min(1200px, calc(100% - 2rem));
    margin: 0 auto;
    padding: 1rem 0 3rem;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.9rem 0.2rem 1rem;
    margin-bottom: 0.9rem;
    border-bottom: 1px solid var(--color-border-soft);
}

.brand-link {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    color: var(--color-text-strong);
    font-weight: 700;
    text-decoration: none;
}

.brand-mark {
    width: 2rem;
    height: 2rem;
    border-radius: 999px;
    border: 3px solid var(--color-primary);
    box-shadow: inset 0 0 0 2px var(--color-brand-ring-shadow);
}

.support-pill {
    margin: 0;
    padding: 0.35rem 0.8rem;
    border-radius: 999px;
    background: var(--color-accent-surface);
    border: 1px solid var(--color-accent-border);
    color: var(--color-support-text);
    font-size: 0.92rem;
    font-weight: 600;
}

.viewer-intro,
.preview-card {
    background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-surface-strong) 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-large);
    box-shadow:
        var(--shadow-elevation),
        inset 0 1px 0 var(--color-surface-edge);
}

.viewer-intro {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(340px, 0.85fr);
    gap: 1.5rem;
    align-items: start;
    padding: 1.45rem;
}

.preview-card {
    margin-top: 1rem;
    padding: 1rem;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    margin: 0 0 0.9rem;
    padding: 0.35rem 0.8rem;
    border-radius: 999px;
    background: var(--color-accent-surface);
    border: 1px solid var(--color-accent-border);
    color: var(--color-label-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.78rem;
    font-weight: 700;
}

.intro-copy h1,
.preview-header h2 {
    margin: 0;
    font-family: var(--font-display);
    line-height: 1;
    letter-spacing: -0.045em;
    color: var(--color-text-strong);
}

.intro-copy h1 {
    max-width: 20ch;
    font-size: clamp(1.95rem, 4vw, 3.4rem);
    font-weight: 800;
}

.intro,
.preview-note,
.notice,
.follow-up {
    color: var(--color-text-muted);
}

.intro {
    max-width: 40ch;
    margin: 0.55rem 0 0;
    font-size: 1rem;
}

.headline-accent {
    color: var(--color-primary);
    text-shadow: 0 8px 22px var(--color-background-tint-top);
}

.intro-panel {
    display: grid;
    gap: 0.9rem;
    align-content: start;
    padding: 1.1rem 1.15rem;
    border-radius: var(--radius-medium);
    border: 1px solid var(--color-border-soft);
    background: linear-gradient(180deg, var(--color-surface-secondary) 0%, var(--color-surface) 100%);
    box-shadow: inset 0 1px 0 var(--color-surface-edge);
}

.intro-footnote {
    display: grid;
    gap: 0.45rem;
}

.notice,
.follow-up {
    margin: 0;
    font-size: 0.9rem;
}

.report-summary {
    display: grid;
    gap: 0;
    margin: 0;
    padding: 0;
}

.summary-item {
    display: grid;
    gap: 0.25rem;
    padding: 0.8rem 0;
    border-top: 1px solid var(--color-border-soft);
}

.summary-item:first-child {
    padding-top: 0;
    border-top: 0;
}

.summary-item:last-child {
    padding-bottom: 0;
}

.summary-item dt {
    margin: 0;
    color: var(--color-label-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.74rem;
    font-weight: 700;
}

.summary-item dd {
    margin: 0;
    color: var(--color-text-strong);
    font-size: 0.98rem;
    line-height: 1.45;
}

.actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.85rem;
    width: 100%;
    margin-top: 0.2rem;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 3rem;
    width: 100%;
    padding: 0.8rem 1.35rem;
    border-radius: 999px;
    border: 1px solid transparent;
    text-decoration: none;
    font-weight: 700;
    transition:
        transform 0.18s ease,
        background-color 0.18s ease,
        color 0.18s ease,
        border-color 0.18s ease,
        box-shadow 0.18s ease;
}

.button-primary {
    background: var(--color-primary);
    color: var(--color-primary-foreground);
}

.button-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
}

.button-secondary {
    background: var(--color-surface-secondary);
    border-color: var(--color-border-strong);
    color: var(--color-text-strong);
    box-shadow: inset 0 1px 0 var(--color-surface-edge);
}

.button-secondary:hover {
    border-color: var(--color-primary);
    background: var(--color-accent-surface);
    transform: translateY(-1px);
}

.follow-up-link {
    color: var(--color-link);
    font-weight: 700;
    text-decoration: underline;
    text-underline-offset: 0.18em;
}

.intro-footnote {
    padding-top: 0.9rem;
    border-top: 1px solid var(--color-border-soft);
}

.preview-header {
    display: grid;
    gap: 0.25rem;
    margin-bottom: 0.75rem;
    padding: 0.1rem 0.2rem 0;
}

.preview-header h2 {
    font-size: 1.02rem;
    font-weight: 700;
    letter-spacing: 0.01em;
}

.preview-note {
    margin: 0;
    font-size: 0.9rem;
}

.preview-toolbar {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.55rem 0.85rem;
    background: var(--color-preview-toolbar-bg);
    border-bottom: 1px solid var(--color-preview-toolbar-border);
    color: var(--color-preview-toolbar-text);
    font-size: 0.82rem;
    font-weight: 500;
}

.preview-toolbar-icon {
    flex: none;
    width: 1rem;
    height: 1rem;
    color: var(--color-label-muted);
}

.preview-toolbar-filename {
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--color-text-strong);
    font-weight: 600;
}

.preview-toolbar-hint {
    flex: none;
    color: var(--color-label-muted);
}

.preview-toolbar-action {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    flex: none;
    color: var(--color-link);
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.18s ease, color 0.18s ease;
}

.preview-toolbar-action-icon {
    width: 0.85rem;
    height: 0.85rem;
}

.preview-toolbar-action:hover {
    border-bottom-color: currentColor;
}

.preview-details {
    display: none;
    margin: 0;
}

.preview-summary {
    display: none;
}

.preview-shell {
    overflow: hidden;
    border-radius: calc(var(--radius-large) - 6px);
    border: 1px solid var(--color-preview-border);
    background: var(--color-preview-shell);
    box-shadow: inset 0 1px 0 var(--color-surface-edge);
}

.preview-frame {
    display: block;
    width: 100%;
    min-height: 96vh;
    border: 0;
    background: var(--color-preview-frame-loading);
}

a {
    color: inherit;
}

a:focus-visible,
.button:focus-visible,
.preview-summary:focus-visible {
    outline: 3px solid var(--color-focus-ring);
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    .button {
        transition: none;
    }
}

@media (max-width: 1100px) {
    .viewer-intro {
        grid-template-columns: 1fr;
    }

    .intro-copy h1 {
        max-width: none;
    }
}

@media (max-width: 920px) {
    .viewer-intro {
        gap: 1rem;
    }

    .intro-copy h1 {
        max-width: none;
    }

    .actions {
        grid-template-columns: 1fr;
    }

    .preview-frame {
        min-height: 78vh;
    }
}

@media (max-width: 680px) {
    .page {
        width: min(100% - 1rem, 1120px);
        padding: 0.75rem 0 2rem;
    }

    .topbar {
        flex-direction: column;
        align-items: flex-start;
        padding-bottom: 1rem;
    }

    .viewer-intro,
    .preview-card {
        border-radius: 20px;
    }

    .viewer-intro {
        grid-template-columns: 1fr;
        padding: 1.35rem;
    }

    .preview-card {
        padding: 0.8rem;
    }

    .preview-desktop {
        display: none;
    }

    .preview-details {
        display: block;
    }

    .intro-panel,
    .actions {
        width: 100%;
    }

    .intro-panel {
        gap: 0.85rem;
        padding: 1rem;
    }

    .intro-footnote {
        padding-top: 0.75rem;
    }

    .preview-summary {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        padding: 0.95rem 1rem;
        border-radius: 16px;
        border: 1px solid var(--color-border-strong);
        background: var(--color-surface-secondary);
        color: var(--color-text-strong);
        cursor: pointer;
        font-weight: 700;
        list-style: none;
        transition:
            border-color 0.18s ease,
            background-color 0.18s ease,
            transform 0.18s ease;
    }

    .preview-summary::-webkit-details-marker {
        display: none;
    }

    .preview-summary::after {
        content: "+";
        display: grid;
        place-items: center;
        width: 1.8rem;
        height: 1.8rem;
        border-radius: 999px;
        background: var(--color-accent-surface);
        border: 1px solid var(--color-accent-border);
        color: var(--color-primary);
        font-size: 1.2rem;
        line-height: 1;
    }

    .preview-summary:hover {
        border-color: var(--color-primary);
        background: var(--color-accent-surface);
        transform: translateY(-1px);
    }

    .preview-details[open] .preview-summary::after {
        content: "-";
    }

    .preview-details:not([open]) > .preview-shell {
        display: none;
    }

    .preview-details[open] > .preview-shell {
        margin-top: 0.75rem;
    }

    .preview-frame-mobile {
        min-height: 70vh;
    }

    .preview-toolbar {
        padding: 0.5rem 0.75rem;
        gap: 0.55rem;
        font-size: 0.78rem;
    }

    .preview-toolbar-hint {
        display: none;
    }
}