/* ==========================================================================
   Ledger Scrolls - Premium Design System
   "A Library That Cannot Burn"

   Design Philosophy:
   This is technology for truth. The UI must feel like accessing something
   sacred, powerful, and permanent. Think: a vault of eternal knowledge
   meets a modern premium app. Every pixel should whisper authority.
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
    /* Dark Theme (Default) — Deep obsidian vault */
    --color-bg-deep: #08090d;
    --color-bg-primary: #0e1017;
    --color-bg-secondary: #151821;
    --color-bg-tertiary: #1c202d;
    --color-bg-elevated: #232839;

    /* Glass Effect — frosted obsidian */
    --glass-bg: rgba(14, 16, 23, 0.88);
    --glass-border: rgba(255, 255, 255, 0.06);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    --glass-blur: blur(24px);

    /* Accent Colors — burnished gold */
    --color-accent-primary: #d4a855;
    --color-accent-secondary: #c9943e;
    --color-accent-tertiary: #f0d78c;
    --color-accent-glow: rgba(212, 168, 85, 0.25);
    --color-accent-gradient: linear-gradient(135deg, #c9943e 0%, #d4a855 40%, #f0d78c 100%);

    /* Semantic */
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --color-error: #fb7185;
    --color-info: #60a5fa;

    /* Text */
    --color-text-primary: #f0f2f5;
    --color-text-secondary: #9ca3b4;
    --color-text-muted: #5c6478;

    /* Typography */
    --font-display: 'Cinzel', serif;
    --font-body: 'Cormorant Garamond', serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 280ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 450ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Safe areas for notched phones */
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
}

/* Light Theme */
[data-theme="light"] {
    --color-bg-deep: #f6f7fa;
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f1f2f5;
    --color-bg-tertiary: #e4e6eb;
    --color-bg-elevated: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.92);
    --glass-border: rgba(0, 0, 0, 0.06);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --color-text-primary: #1a1d26;
    --color-text-secondary: #4b5568;
    --color-text-muted: #9ca3af;
    --color-accent-primary: #b8860b;
    --color-accent-secondary: #9a7209;
    --color-accent-glow: rgba(184, 134, 11, 0.2);
}

/* Parchment Theme */
[data-theme="parchment"] {
    --color-bg-deep: #f0e2c0;
    --color-bg-primary: #f8f0de;
    --color-bg-secondary: #ede3cc;
    --color-bg-tertiary: #e2d6be;
    --color-bg-elevated: #fdf6e8;
    --glass-bg: rgba(248, 240, 222, 0.92);
    --glass-border: rgba(139, 90, 43, 0.12);
    --glass-shadow: 0 8px 32px rgba(139, 90, 43, 0.12);
    --color-text-primary: #33200c;
    --color-text-secondary: #5c4830;
    --color-text-muted: #8b7355;
    --color-accent-primary: #8b4513;
    --color-accent-secondary: #6b3410;
    --color-accent-tertiary: #d4a855;
    --color-accent-glow: rgba(139, 69, 19, 0.2);
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-tap-highlight-color: transparent;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-deep);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    overscroll-behavior: none;
}

/* --------------------------------------------------------------------------
   Background Animation — Constellation field
   -------------------------------------------------------------------------- */
.background-animation {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
}

.particles {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--color-accent-primary);
    border-radius: 50%;
    opacity: 0;
    animation: float-particle 25s infinite;
}

@keyframes float-particle {
    0% { opacity: 0; transform: translateY(100vh) scale(0); }
    8% { opacity: 0.5; }
    92% { opacity: 0.3; }
    100% { opacity: 0; transform: translateY(-80px) scale(1); }
}

.gradient-overlay {
    position: absolute;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 25% 15%, rgba(212, 168, 85, 0.05) 0%, transparent 55%),
        radial-gradient(ellipse at 75% 85%, rgba(96, 120, 170, 0.035) 0%, transparent 55%);
}

/* --------------------------------------------------------------------------
   App Container
   -------------------------------------------------------------------------- */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
    padding-top: var(--safe-top);
    padding-bottom: calc(72px + var(--safe-bottom));
}

/* --------------------------------------------------------------------------
   Header — Sleek, minimal, authoritative
   -------------------------------------------------------------------------- */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: var(--safe-top);
    z-index: 100;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
}

.logo-icon {
    font-size: 1.6rem;
    filter: drop-shadow(0 0 10px var(--color-accent-glow));
    animation: gentle-pulse 5s ease-in-out infinite;
}

@keyframes gentle-pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.06); opacity: 0.9; }
}

.logo-text h1 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.connection-pill {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    font-size: 0.72rem;
    cursor: pointer;
    transition: all var(--transition-base);
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    transition: all var(--transition-base);
}

.status-dot.disconnected { background: var(--color-text-muted); }
.status-dot.connecting {
    background: var(--color-warning);
    animation: pulse-dot 1.5s ease-in-out infinite;
}
.status-dot.connected {
    background: var(--color-success);
    box-shadow: 0 0 8px rgba(52, 211, 153, 0.5);
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.status-text {
    color: var(--color-text-secondary);
    font-family: var(--font-mono);
    font-weight: 500;
    letter-spacing: 0.02em;
}

/* --------------------------------------------------------------------------
   Viewer Area
   -------------------------------------------------------------------------- */
.viewer-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--space-md);
    overflow-y: auto;
}

/* Scroll Title Bar */
.scroll-title-bar {
    display: none;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
}

.scroll-title-bar.active {
    display: flex;
}

.btn-back {
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: 1.15rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-back:active {
    transform: scale(0.93);
    background: var(--color-bg-elevated);
}

.scroll-title-bar h2 {
    flex: 1;
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    letter-spacing: 0.02em;
}

.title-actions {
    display: flex;
    gap: 6px;
}

/* --------------------------------------------------------------------------
   Loading State — Scroll Animation
   -------------------------------------------------------------------------- */
.viewer-loading {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-xl);
}

.viewer-loading.hidden {
    display: none;
}

/* Animated Scroll */
.scroll-animation {
    position: relative;
    width: 110px;
    height: 150px;
    margin-bottom: var(--space-lg);
}

.scroll-paper {
    position: absolute;
    top: 20px;
    left: 10px;
    right: 10px;
    bottom: 20px;
    background: linear-gradient(180deg, #f4e4c1 0%, #e8d4a8 100%);
    border-radius: 4px;
    overflow: hidden;
    box-shadow:
        inset 0 0 20px rgba(139, 90, 43, 0.1),
        0 4px 24px rgba(0, 0, 0, 0.35);
}

.scroll-content-preview {
    padding: 14px 10px;
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.scroll-line {
    height: 3px;
    background: rgba(60, 40, 20, 0.12);
    border-radius: 2px;
    animation: scroll-read 2.2s ease-in-out infinite;
}

.scroll-line.short {
    width: 55%;
}

.scroll-line:nth-child(1) { animation-delay: 0s; }
.scroll-line:nth-child(2) { animation-delay: 0.15s; }
.scroll-line:nth-child(3) { animation-delay: 0.3s; }
.scroll-line:nth-child(4) { animation-delay: 0.45s; }
.scroll-line:nth-child(5) { animation-delay: 0.6s; }

@keyframes scroll-read {
    0%, 100% { opacity: 0.25; transform: scaleX(1); }
    50% { opacity: 1; transform: scaleX(1.015); background: rgba(212, 168, 85, 0.35); }
}

.scroll-roller {
    position: absolute;
    left: 0;
    right: 0;
    height: 22px;
    background: linear-gradient(90deg,
        #8b6914 0%,
        #d4a855 20%,
        #f0d78c 50%,
        #d4a855 80%,
        #8b6914 100%
    );
    border-radius: 11px;
    box-shadow:
        0 2px 10px rgba(0, 0, 0, 0.35),
        inset 0 -2px 4px rgba(0, 0, 0, 0.2),
        inset 0 2px 4px rgba(255, 255, 255, 0.3);
}

.scroll-roller.top {
    top: 0;
    animation: roller-spin 3s linear infinite;
}

.scroll-roller.bottom {
    bottom: 0;
    animation: roller-spin 3s linear infinite reverse;
}

@keyframes roller-spin {
    0% { background-position: 0 0; }
    100% { background-position: 100px 0; }
}

/* Loading is active state */
.viewer-loading.loading .scroll-animation {
    animation: scroll-unfurl 0.8s ease-out forwards;
}

@keyframes scroll-unfurl {
    0% { transform: scaleY(0.3); opacity: 0.4; }
    100% { transform: scaleY(1); opacity: 1; }
}

.loading-text {
    font-family: var(--font-body);
    font-size: 1.05rem;
    font-style: italic;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
    min-height: 1.5em;
}

/* Progress Section */
.scroll-progress {
    width: 100%;
    max-width: 300px;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.scroll-progress.active {
    opacity: 1;
}

.progress-pages {
    display: flex;
    justify-content: center;
    align-items: baseline;
    gap: 4px;
    margin-bottom: var(--space-sm);
    font-family: var(--font-mono);
}

.current-page {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--color-accent-primary);
    text-shadow: 0 0 24px var(--color-accent-glow);
    transition: all var(--transition-fast);
}

.current-page.pulse {
    animation: page-pulse 0.3s ease;
}

@keyframes page-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

.page-divider {
    color: var(--color-text-muted);
    font-size: 1.1rem;
}

.total-pages {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
}

.progress-track {
    height: 4px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--color-accent-gradient);
    border-radius: var(--radius-full);
    transition: width var(--transition-fast);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: shimmer 2s infinite;
}

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

.progress-status {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    text-align: center;
    font-family: var(--font-mono);
}

/* --------------------------------------------------------------------------
   Viewer Content
   -------------------------------------------------------------------------- */
.viewer-content {
    display: none;
    flex-direction: column;
    gap: var(--space-md);
}

.viewer-content.active {
    display: flex;
    flex: 1;
}

.viewer-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.viewer-content video {
    width: 100%;
    max-height: 60vh;
    border-radius: var(--radius-md);
    background: #000;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.viewer-content pre,
.viewer-content .text-content {
    padding: var(--space-lg);
    background: var(--color-bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.7;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 65vh;
    overflow-y: auto;
}

.viewer-content iframe {
    width: 100%;
    height: 65vh;
    border: none;
    border-radius: var(--radius-md);
    background: white;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* --------------------------------------------------------------------------
   Metadata — Sleek collapsible panel
   -------------------------------------------------------------------------- */
.scroll-metadata {
    display: none;
    margin-top: var(--space-lg);
    padding-top: var(--space-md);
}

.scroll-metadata.active {
    display: block;
}

.metadata-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.88rem;
    letter-spacing: 0.02em;
    transition: all var(--transition-fast);
}

.toggle-arrow {
    transition: transform var(--transition-base);
    font-size: 0.7rem;
    opacity: 0.6;
}

.scroll-metadata.collapsed .toggle-arrow {
    transform: rotate(-90deg);
}

.metadata-content {
    padding: var(--space-md);
    background: var(--color-bg-primary);
    border: 1px solid var(--glass-border);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.scroll-metadata.collapsed .metadata-content {
    display: none;
}

.metadata-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-sm);
}

.metadata-item {
    display: flex;
    flex-direction: column;
    gap: 3px;
    padding: var(--space-xs) 0;
}

.metadata-label {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
}

.metadata-value {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--color-text-primary);
    word-break: break-all;
}

.metadata-value.hash {
    font-size: 0.68rem;
    color: var(--color-accent-primary);
    opacity: 0.9;
}

/* --------------------------------------------------------------------------
   Bottom Navigation — Floating, premium
   -------------------------------------------------------------------------- */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-md);
    padding: 10px var(--space-lg);
    padding-bottom: calc(10px + var(--safe-bottom));
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-top: 1px solid var(--glass-border);
    z-index: 200;
}

.nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-btn:active {
    transform: scale(0.93);
}

/* Secondary buttons — compact, understated */
.nav-btn-secondary {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--glass-border);
}

.nav-btn-secondary .nav-icon {
    font-size: 1.15rem;
}

.nav-btn-secondary .nav-label {
    display: none;
}

/* Primary button — the centrepiece */
.nav-btn-primary {
    flex-direction: row;
    gap: var(--space-sm);
    padding: 10px var(--space-xl);
    background: var(--color-accent-gradient);
    color: #12151c;
    border-radius: var(--radius-full);
    font-weight: 700;
    box-shadow:
        0 4px 20px var(--color-accent-glow),
        0 0 0 1px rgba(212, 168, 85, 0.2);
    position: relative;
    overflow: hidden;
}

.nav-btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 30%, rgba(255,255,255,0.15) 50%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.nav-btn-primary:active {
    box-shadow: 0 2px 12px var(--color-accent-glow);
}

.nav-btn-primary .nav-icon {
    font-size: 1.35rem;
}

.nav-btn-primary .nav-label {
    font-size: 0.95rem;
    font-weight: 700;
    font-family: var(--font-display);
    letter-spacing: 0.03em;
}

/* --------------------------------------------------------------------------
   Drawer (Bottom Sheet) — Premium glass panel
   -------------------------------------------------------------------------- */
.drawer {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 300;
}

.drawer.active {
    display: block;
}

.drawer-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(6px);
    animation: fade-in 0.2s ease;
}

@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

.drawer-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    max-height: 88vh;
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    display: flex;
    flex-direction: column;
    animation: slide-up 0.35s cubic-bezier(0.32, 0.72, 0, 1);
    padding-bottom: var(--safe-bottom);
    border: 1px solid var(--glass-border);
    border-bottom: none;
    box-shadow: 0 -8px 40px rgba(0, 0, 0, 0.4);
}

@keyframes slide-up {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

.drawer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--glass-border);
    flex-shrink: 0;
    position: relative;
}

.drawer-header::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 36px;
    height: 4px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
}

.drawer-header h3 {
    font-family: var(--font-display);
    font-size: 1.05rem;
    letter-spacing: 0.03em;
}

.drawer-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md) var(--space-lg);
    -webkit-overflow-scrolling: touch;
}

/* --------------------------------------------------------------------------
   Library Drawer — The heart of the experience
   -------------------------------------------------------------------------- */
.search-box {
    margin-bottom: var(--space-md);
    position: relative;
}

.search-input {
    width: 100%;
    padding: 10px var(--space-lg);
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    outline: none;
    transition: all var(--transition-base);
}

.search-input:focus {
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
    background: var(--color-bg-tertiary);
}

.search-input::placeholder {
    color: var(--color-text-muted);
    font-style: italic;
}

.category-chips {
    display: flex;
    gap: var(--space-sm);
    overflow-x: auto;
    padding-bottom: var(--space-sm);
    margin-bottom: var(--space-md);
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.category-chips::-webkit-scrollbar {
    display: none;
}

.category-chip {
    flex-shrink: 0;
    padding: 6px var(--space-md);
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    background: var(--color-bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.category-chip:active {
    transform: scale(0.96);
}

.category-chip.active {
    color: var(--color-text-primary);
    background: var(--color-bg-elevated);
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 1px var(--color-accent-glow);
}

.scroll-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.scroll-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.scroll-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--color-accent-gradient);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.scroll-item:active {
    transform: scale(0.98);
    background: var(--color-bg-tertiary);
}

.scroll-item-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.scroll-item-info {
    flex: 1;
    min-width: 0;
}

.scroll-item-title {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 3px;
    line-height: 1.3;
    letter-spacing: 0.01em;
}

.scroll-item-meta {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.72rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

.scroll-item-type {
    padding: 2px 8px;
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent-primary);
    background: rgba(212, 168, 85, 0.1);
    border: 1px solid rgba(212, 168, 85, 0.15);
    border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   Settings Drawer
   -------------------------------------------------------------------------- */
.settings-section {
    margin-bottom: var(--space-xl);
}

.settings-section h4 {
    font-family: var(--font-display);
    font-size: 0.92rem;
    margin-bottom: var(--space-md);
    letter-spacing: 0.02em;
}

.toggle-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.toggle-option {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toggle-option:has(input:checked) {
    border-color: var(--color-accent-primary);
}

.toggle-option input {
    width: 18px;
    height: 18px;
    accent-color: var(--color-accent-primary);
}

.toggle-label {
    display: flex;
    flex-direction: column;
}

.toggle-label strong {
    font-size: 0.92rem;
}

.toggle-label small {
    font-size: 0.78rem;
    color: var(--color-text-muted);
}

.input-row {
    display: flex;
    gap: var(--space-sm);
}

.input-row input {
    flex: 1;
    padding: 8px var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    outline: none;
    transition: all var(--transition-fast);
}

.input-row input:focus {
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 2px var(--color-accent-glow);
}

.help-text {
    margin-top: var(--space-sm);
    font-size: 0.78rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

.help-text a {
    color: var(--color-accent-primary);
    text-decoration: none;
}

.help-text a:hover {
    text-decoration: underline;
}

.theme-pills {
    display: flex;
    gap: var(--space-sm);
}

.theme-pill {
    flex: 1;
    padding: 10px var(--space-sm);
    font-family: var(--font-body);
    font-size: 0.85rem;
    text-align: center;
    color: var(--color-text-secondary);
    background: var(--color-bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-pill:active {
    transform: scale(0.96);
}

.theme-pill.active {
    color: var(--color-text-primary);
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 1px var(--color-accent-glow);
}

/* --------------------------------------------------------------------------
   About Drawer — Tell the story
   -------------------------------------------------------------------------- */
.about-hero {
    text-align: center;
    padding: var(--space-xl) 0 var(--space-lg);
}

.about-icon {
    font-size: 3.5rem;
    margin-bottom: var(--space-sm);
    filter: drop-shadow(0 4px 16px var(--color-accent-glow));
}

.about-hero h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: var(--space-xs);
    letter-spacing: 0.04em;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-tagline {
    color: var(--color-text-secondary);
    font-style: italic;
    font-size: 1.05rem;
}

.philosophy-quote {
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-style: italic;
    text-align: center;
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-lg) 0;
    color: var(--color-accent-tertiary);
    border-left: 3px solid var(--color-accent-primary);
    background: linear-gradient(135deg, rgba(212, 168, 85, 0.08) 0%, rgba(212, 168, 85, 0.02) 100%);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.about-section {
    margin-bottom: var(--space-lg);
}

.about-section h4 {
    font-family: var(--font-display);
    font-size: 0.95rem;
    margin-bottom: var(--space-sm);
    letter-spacing: 0.02em;
}

.about-section p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 1rem;
}

.about-section a {
    color: var(--color-accent-primary);
    text-decoration: none;
    border-bottom: 1px solid rgba(212, 168, 85, 0.3);
    transition: border-color var(--transition-fast);
}

.about-section a:hover {
    border-bottom-color: var(--color-accent-primary);
}

.check-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.check-list li {
    padding: 6px 0;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.about-footer {
    text-align: center;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--glass-border);
    color: var(--color-text-muted);
    font-size: 0.88rem;
}

.about-footer a {
    color: var(--color-accent-primary);
    text-decoration: none;
}

.about-footer a:hover {
    text-decoration: underline;
}

/* --------------------------------------------------------------------------
   Modal — Premium overlay
   -------------------------------------------------------------------------- */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 400;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
}

.modal.active {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 420px;
    max-height: 82vh;
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
    overflow: hidden;
    animation: modal-enter 0.3s cubic-bezier(0.32, 0.72, 0, 1);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

@keyframes modal-enter {
    from { opacity: 0; transform: scale(0.94) translateY(16px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--glass-border);
}

.modal-header h3 {
    font-family: var(--font-display);
    font-size: 1.05rem;
    letter-spacing: 0.02em;
}

.modal-body {
    padding: var(--space-lg);
    overflow-y: auto;
    max-height: 62vh;
}

/* --------------------------------------------------------------------------
   Tabs
   -------------------------------------------------------------------------- */
.tabs {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.tab-btn {
    flex: 1;
    padding: var(--space-sm);
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    background: var(--color-bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab-btn.active {
    color: var(--color-text-primary);
    border-color: var(--color-accent-primary);
    background: var(--color-bg-tertiary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* --------------------------------------------------------------------------
   Form Elements
   -------------------------------------------------------------------------- */
.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-xs);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    letter-spacing: 0.02em;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 8px var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    outline: none;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 2px var(--color-accent-glow);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

/* --------------------------------------------------------------------------
   Buttons — Premium feel
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 8px var(--space-md);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn:active {
    transform: scale(0.97);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.btn-primary {
    background: var(--color-accent-gradient);
    color: #12151c;
    border-color: transparent;
    font-weight: 700;
    box-shadow: 0 2px 12px var(--color-accent-glow);
}

.btn-outline {
    background: transparent;
    border-color: var(--color-text-muted);
}

.btn-sm {
    padding: 5px var(--space-sm);
    font-size: 0.85rem;
}

.btn-block {
    width: 100%;
}

.btn-icon {
    width: 38px;
    height: 38px;
    padding: 0;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-primary);
}

.btn-icon:active {
    transform: scale(0.93);
}

.btn-icon:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    transform: none;
}

/* --------------------------------------------------------------------------
   Verification Modal
   -------------------------------------------------------------------------- */
.verification-result {
    text-align: center;
}

.verification-icon {
    font-size: 3.5rem;
    margin-bottom: var(--space-md);
}

.verification-status {
    font-family: var(--font-display);
    font-size: 1.2rem;
    margin-bottom: var(--space-lg);
    letter-spacing: 0.03em;
}

.verification-status.verified { color: var(--color-success); }
.verification-status.failed { color: var(--color-error); }

.hash-comparison {
    text-align: left;
    padding: var(--space-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
}

.hash-row {
    margin-bottom: var(--space-md);
}

.hash-row:last-child {
    margin-bottom: 0;
}

.hash-label {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xs);
}

.hash-value {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    word-break: break-all;
    padding: var(--space-sm);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    line-height: 1.5;
}

/* --------------------------------------------------------------------------
   Toast Notifications — Elegant, non-intrusive
   -------------------------------------------------------------------------- */
.toast-container {
    position: fixed;
    top: calc(60px + var(--safe-top));
    left: var(--space-md);
    right: var(--space-md);
    z-index: 500;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 10px var(--space-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
    animation: toast-enter 0.35s cubic-bezier(0.32, 0.72, 0, 1);
    pointer-events: auto;
    backdrop-filter: blur(12px);
}

@keyframes toast-enter {
    from { opacity: 0; transform: translateY(-16px) scale(0.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.toast.toast-exit {
    animation: toast-exit 0.25s ease forwards;
}

@keyframes toast-exit {
    to { opacity: 0; transform: translateY(-12px) scale(0.96); }
}

.toast-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
}

.toast-message {
    flex: 1;
    font-size: 0.88rem;
    font-weight: 500;
}

.toast.success { border-left: 3px solid var(--color-success); }
.toast.warning { border-left: 3px solid var(--color-warning); }
.toast.error { border-left: 3px solid var(--color-error); }
.toast.info { border-left: 3px solid var(--color-info); }

.toast-close {
    background: none;
    border: none;
    color: var(--color-text-muted);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0 0 0 var(--space-sm);
    flex-shrink: 0;
    line-height: 1;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.toast-close:hover {
    opacity: 1;
    color: var(--color-text-primary);
}

/* --------------------------------------------------------------------------
   Desktop Enhancements
   -------------------------------------------------------------------------- */
@media (min-width: 768px) {
    .app-container {
        max-width: 840px;
        margin: 0 auto;
        padding-bottom: 80px;
    }

    /* Centre drawer on desktop */
    .drawer-content {
        max-height: 82vh;
        max-width: 560px;
        left: 50%;
        transform: translateX(-50%);
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        animation: slide-up-centered 0.35s cubic-bezier(0.32, 0.72, 0, 1);
    }

    @keyframes slide-up-centered {
        from { transform: translateX(-50%) translateY(100%); }
        to { transform: translateX(-50%) translateY(0); }
    }

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

    .viewer-content video,
    .viewer-content iframe {
        max-height: 72vh;
    }

    .scroll-list {
        display: flex;
        flex-direction: column;
        gap: var(--space-sm);
    }

    .scroll-item {
        padding: var(--space-md) var(--space-lg);
    }

    .scroll-item-title {
        font-size: 0.95rem;
    }

    .scroll-item-icon {
        font-size: 2rem;
    }
}

@media (min-width: 1024px) {
    .app-container {
        max-width: 920px;
    }

    .bottom-nav {
        max-width: 420px;
        left: 50%;
        transform: translateX(-50%);
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    }

    .drawer-content {
        max-width: 640px;
    }
}

/* --------------------------------------------------------------------------
   Accessibility: Focus-visible styles
   -------------------------------------------------------------------------- */
*:focus-visible {
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 2px;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px var(--color-accent-glow);
}

/* --------------------------------------------------------------------------
   Desktop: Hover States
   -------------------------------------------------------------------------- */
@media (hover: hover) and (pointer: fine) {
    .scroll-item:hover {
        background: var(--color-bg-tertiary);
        border-color: var(--color-accent-primary);
        transform: translateY(-2px);
        box-shadow: 0 6px 24px rgba(0, 0, 0, 0.25);
    }

    .scroll-item:hover::before {
        opacity: 1;
    }

    .category-chip:hover {
        background: var(--color-bg-elevated);
        color: var(--color-text-primary);
        border-color: var(--color-text-muted);
    }

    .nav-btn-secondary:hover {
        background: var(--color-bg-elevated);
        color: var(--color-text-primary);
        border-color: var(--color-text-muted);
    }

    .nav-btn-primary:hover {
        box-shadow: 0 8px 32px var(--color-accent-glow);
        transform: translateY(-1px);
    }

    .nav-btn-primary:hover::before {
        opacity: 1;
    }

    .btn-back:hover {
        background: var(--color-bg-elevated);
        border-color: var(--color-text-muted);
    }

    .btn-icon:hover:not(:disabled) {
        background: var(--color-bg-elevated);
        border-color: var(--color-text-muted);
        transform: scale(1.04);
    }

    .btn:hover:not(:disabled) {
        border-color: var(--color-accent-primary);
    }

    .btn-primary:hover:not(:disabled) {
        box-shadow: 0 4px 20px var(--color-accent-glow);
    }

    .btn-outline:hover:not(:disabled) {
        background: var(--color-bg-tertiary);
        border-color: var(--color-accent-primary);
        color: var(--color-accent-primary);
    }

    .theme-pill:hover {
        background: var(--color-bg-tertiary);
        color: var(--color-text-primary);
        border-color: var(--color-text-muted);
    }

    .metadata-toggle:hover {
        background: var(--color-bg-tertiary);
    }

    .connection-pill:hover {
        background: var(--color-bg-elevated);
        border-color: var(--color-text-muted);
    }
}

/* --------------------------------------------------------------------------
   Drawer: Entrance polish
   -------------------------------------------------------------------------- */
.drawer.active .drawer-backdrop {
    animation: fade-in 0.2s ease forwards;
}

/* --------------------------------------------------------------------------
   Empty State
   -------------------------------------------------------------------------- */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl) var(--space-md);
    text-align: center;
    color: var(--color-text-muted);
}

.empty-state-icon {
    font-size: 2.8rem;
    margin-bottom: var(--space-md);
    opacity: 0.4;
}

.empty-state-text {
    font-family: var(--font-body);
    font-size: 1rem;
    font-style: italic;
    max-width: 260px;
    line-height: 1.5;
}

/* --------------------------------------------------------------------------
   Reduced motion: respect prefers-reduced-motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .particle {
        display: none;
    }
}