/* ═══════════════════════════════════════════════════════
   PDF Cover Changer — Apple Liquid Glass
   ═══════════════════════════════════════════════════════ */

/* ── Tokens ─────────────────────────────────────────── */
:root {
    --bg: #f7f7f9;
    --bg: oklch(97% 0.006 260);
    --bg-secondary: #e8e8ec;
    --bg-secondary: oklch(93% 0.008 260);
    --bg-mesh-1: rgba(226, 228, 238, 0.5);
    --bg-mesh-1: oklch(94% 0.02 240 / 0.5);
    --bg-mesh-2: rgba(232, 228, 240, 0.3);
    --bg-mesh-2: oklch(95% 0.018 300 / 0.3);
    --bg-mesh-3: rgba(228, 236, 234, 0.25);
    --bg-mesh-3: oklch(96% 0.015 180 / 0.25);
    --surface: rgba(255, 255, 255, 0.72);
    --surface: oklch(100% 0 0 / 0.72);
    --surface-hover: rgba(255, 255, 255, 0.82);
    --surface-hover: oklch(100% 0 0 / 0.82);
    --surface-solid: #fafafa;
    --surface-solid: oklch(98% 0.004 260);
    --fg: #2b2b2d;
    --fg: oklch(17% 0.016 260);
    --muted: #75757a;
    --muted: oklch(46% 0.016 260);
    --muted-2: #9999a0;
    --muted-2: oklch(60% 0.012 260);
    --border: rgba(255, 255, 255, 0.55);
    --border: oklch(100% 0 0 / 0.55);
    --border-strong: rgba(218, 218, 224, 0.8);
    --border-strong: oklch(88% 0.01 260 / 0.8);
    --accent: #0071e3;
    --accent: oklch(57% 0.20 258);
    --accent-hover: #005bb5;
    --accent-hover: oklch(52% 0.22 258);
    --accent-soft: #e8f0fe;
    --accent-soft: oklch(94% 0.04 258);
    --success: #2e8b57;
    --success: oklch(52% 0.17 155);
    --success-soft: #e8f5ee;
    --success-soft: oklch(94% 0.04 155);
    --danger: #e53e3e;
    --danger: oklch(55% 0.22 25);
    --danger-soft: #fee2e2;
    --danger-soft: oklch(94% 0.04 25);
    --warning: #dd6b20;
    --warning: oklch(60% 0.20 85);
    --warning-soft: #fef3c7;
    --warning-soft: oklch(95% 0.05 85);
    --purple: #7b2cbf;
    --purple: oklch(55% 0.18 300);
    --purple-soft: #f0e8f8;
    --purple-soft: oklch(94% 0.04 300);
    --on-accent: #ffffff;
    --on-accent: oklch(100% 0 0);

    --glass-blur: blur(28px) saturate(1.8);
    --glass-bg: oklch(100% 0 0 / 0.68);
    --glass-bg-strong: oklch(100% 0 0 / 0.80);
    --glass-border: 1px solid oklch(100% 0 0 / 0.50);
    --glass-shadow: 0 2px 20px oklch(0% 0 0 / 0.06), 0 0.5px 0.5px oklch(0% 0 0 / 0.04);
    --glass-shadow-lg: 0 8px 40px oklch(0% 0 0 / 0.08), 0 2px 8px oklch(0% 0 0 / 0.04);
    --glass-shadow-xl: 0 16px 64px oklch(0% 0 0 / 0.10), 0 4px 16px oklch(0% 0 0 / 0.06);
    --glass-highlight: inset 0 1px 0 oklch(100% 0 0 / 0.6);

    --font-display: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', system-ui, sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Inter', system-ui, sans-serif;
    --font-mono: 'SF Mono', ui-monospace, 'JetBrains Mono', 'Cascadia Code', Menlo, monospace;

    --fs-h1: clamp(34px, 5vw, 56px);
    --fs-h2: clamp(24px, 3.2vw, 36px);
    --fs-h3: 19px;
    --fs-lead: 17px;
    --fs-body: 15px;
    --fs-sm: 13px;
    --fs-xs: 11px;
    --gap-xs: 6px;
    --gap-sm: 10px;
    --gap-md: 18px;
    --gap-lg: 28px;
    --gap-xl: 48px;
    --gap-2xl: 80px;
    --container: 1080px;
    --gutter: 24px;
    --radius: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --radius-pill: 999px;
}

/* ── Dark theme ─────────────────────────────────────── */
[data-theme="dark"] {
    --bg: #242428;
    --bg: oklch(14% 0.014 260);
    --bg-secondary: #2a2a30;
    --bg-secondary: oklch(17% 0.016 260);
    --bg-mesh-1: rgba(50, 48, 70, 0.3);
    --bg-mesh-1: oklch(20% 0.03 240 / 0.3);
    --bg-mesh-2: rgba(45, 42, 60, 0.2);
    --bg-mesh-2: oklch(18% 0.025 300 / 0.2);
    --bg-mesh-3: rgba(40, 48, 46, 0.15);
    --bg-mesh-3: oklch(16% 0.02 180 / 0.15);
    --surface: rgba(55, 55, 65, 0.65);
    --surface: oklch(22% 0.014 260 / 0.65);
    --surface-hover: rgba(65, 65, 75, 0.75);
    --surface-hover: oklch(26% 0.014 260 / 0.75);
    --surface-solid: #2e2e34;
    --surface-solid: oklch(18% 0.014 260);
    --fg: #f2f2f5;
    --fg: oklch(95% 0.006 260);
    --muted: #9999a5;
    --muted: oklch(60% 0.014 260);
    --muted-2: #7a7a85;
    --muted-2: oklch(48% 0.012 260);
    --border: rgba(255, 255, 255, 0.10);
    --border: oklch(100% 0 0 / 0.10);
    --border-strong: rgba(255, 255, 255, 0.16);
    --border-strong: oklch(100% 0 0 / 0.16);
    --accent: #5aa9f5;
    --accent: oklch(68% 0.18 258);
    --accent-hover: #7bbcf7;
    --accent-hover: oklch(73% 0.16 258);
    --accent-soft: rgba(55, 55, 75, 0.5);
    --accent-soft: oklch(22% 0.04 258);
    --success: #5cc98a;
    --success: oklch(68% 0.15 155);
    --success-soft: rgba(45, 65, 55, 0.5);
    --success-soft: oklch(20% 0.04 155);
    --danger: #fc8181;
    --danger: oklch(72% 0.20 25);
    --danger-soft: rgba(65, 45, 45, 0.5);
    --danger-soft: oklch(20% 0.04 25);
    --warning: #fbd38d;
    --warning: oklch(82% 0.18 85);
    --warning-soft: rgba(65, 55, 40, 0.5);
    --warning-soft: oklch(22% 0.05 85);
    --purple: #a56ee0;
    --purple: oklch(68% 0.16 300);
    --purple-soft: rgba(60, 50, 75, 0.5);
    --purple-soft: oklch(22% 0.04 300);
    --on-accent: #ffffff;
    --on-accent: oklch(100% 0 0);

    --glass-bg: rgba(55, 55, 65, 0.55);
    --glass-bg: oklch(22% 0.014 260 / 0.55);
    --glass-bg-strong: rgba(55, 55, 65, 0.70);
    --glass-bg-strong: oklch(22% 0.014 260 / 0.70);
    --glass-border: 1px solid rgba(255, 255, 255, 0.10);
    --glass-border: 1px solid oklch(100% 0 0 / 0.10);
    --glass-shadow: 0 2px 20px rgba(0, 0, 0, 0.3), 0 0.5px 0.5px rgba(0, 0, 0, 0.2);
    --glass-shadow: 0 2px 20px oklch(0% 0 0 / 0.3), 0 0.5px 0.5px oklch(0% 0 0 / 0.2);
    --glass-shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.25);
    --glass-shadow-lg: 0 8px 40px oklch(0% 0 0 / 0.4), 0 2px 8px oklch(0% 0 0 / 0.25);
    --glass-shadow-xl: 0 16px 64px rgba(0, 0, 0, 0.5), 0 4px 16px rgba(0, 0, 0, 0.3);
    --glass-shadow-xl: 0 16px 64px oklch(0% 0 0 / 0.5), 0 4px 16px oklch(0% 0 0 / 0.3);
    --glass-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.08);
    --glass-highlight: inset 0 1px 0 oklch(100% 0 0 / 0.08);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg: #242428;
        --bg: oklch(14% 0.014 260);
        --bg-secondary: #2a2a30;
        --bg-secondary: oklch(17% 0.016 260);
        --bg-mesh-1: rgba(50, 48, 70, 0.3);
        --bg-mesh-1: oklch(20% 0.03 240 / 0.3);
        --bg-mesh-2: rgba(45, 42, 60, 0.2);
        --bg-mesh-2: oklch(18% 0.025 300 / 0.2);
        --bg-mesh-3: rgba(40, 48, 46, 0.15);
        --bg-mesh-3: oklch(16% 0.02 180 / 0.15);
        --surface: rgba(55, 55, 65, 0.65);
        --surface: oklch(22% 0.014 260 / 0.65);
        --surface-hover: rgba(65, 65, 75, 0.75);
        --surface-hover: oklch(26% 0.014 260 / 0.75);
        --surface-solid: #2e2e34;
        --surface-solid: oklch(18% 0.014 260);
        --fg: #f2f2f5;
        --fg: oklch(95% 0.006 260);
        --muted: #9999a5;
        --muted: oklch(60% 0.014 260);
        --muted-2: #7a7a85;
        --muted-2: oklch(48% 0.012 260);
        --border: rgba(255, 255, 255, 0.10);
        --border: oklch(100% 0 0 / 0.10);
        --border-strong: rgba(255, 255, 255, 0.16);
        --border-strong: oklch(100% 0 0 / 0.16);
        --accent: #5aa9f5;
        --accent: oklch(68% 0.18 258);
        --accent-hover: #7bbcf7;
        --accent-hover: oklch(73% 0.16 258);
        --accent-soft: rgba(55, 55, 75, 0.5);
        --accent-soft: oklch(22% 0.04 258);
        --success: #5cc98a;
        --success: oklch(68% 0.15 155);
        --success-soft: rgba(45, 65, 55, 0.5);
        --success-soft: oklch(20% 0.04 155);
        --danger: #fc8181;
        --danger: oklch(72% 0.20 25);
        --danger-soft: rgba(65, 45, 45, 0.5);
        --danger-soft: oklch(20% 0.04 25);
        --warning: #fbd38d;
        --warning: oklch(82% 0.18 85);
        --warning-soft: rgba(65, 55, 40, 0.5);
        --warning-soft: oklch(22% 0.05 85);
        --purple: #a56ee0;
        --purple: oklch(68% 0.16 300);
        --purple-soft: rgba(60, 50, 75, 0.5);
        --purple-soft: oklch(22% 0.04 300);
        --on-accent: #ffffff;
        --on-accent: oklch(100% 0 0);
        --glass-bg: rgba(55, 55, 65, 0.55);
        --glass-bg: oklch(22% 0.014 260 / 0.55);
        --glass-bg-strong: rgba(55, 55, 65, 0.70);
        --glass-bg-strong: oklch(22% 0.014 260 / 0.70);
        --glass-border: 1px solid rgba(255, 255, 255, 0.10);
        --glass-border: 1px solid oklch(100% 0 0 / 0.10);
        --glass-shadow: 0 2px 20px rgba(0, 0, 0, 0.3), 0 0.5px 0.5px rgba(0, 0, 0, 0.2);
        --glass-shadow: 0 2px 20px oklch(0% 0 0 / 0.3), 0 0.5px 0.5px oklch(0% 0 0 / 0.2);
        --glass-shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.25);
        --glass-shadow-lg: 0 8px 40px oklch(0% 0 0 / 0.4), 0 2px 8px oklch(0% 0 0 / 0.25);
        --glass-shadow-xl: 0 16px 64px rgba(0, 0, 0, 0.5), 0 4px 16px rgba(0, 0, 0, 0.3);
        --glass-shadow-xl: 0 16px 64px oklch(0% 0 0 / 0.5), 0 4px 16px oklch(0% 0 0 / 0.3);
        --glass-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.08);
        --glass-highlight: inset 0 1px 0 oklch(100% 0 0 / 0.08);
    }
}

/* ── Reset & base ───────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font-body);
    font-size: var(--fs-body);
    line-height: 1.6;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
}

/* Mesh gradient background */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background: radial-gradient(ellipse 80% 60% at 20% 10%, var(--bg-mesh-1) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 20%, var(--bg-mesh-2) 0%, transparent 55%),
    radial-gradient(ellipse 70% 60% at 50% 90%, var(--bg-mesh-3) 0%, transparent 50%);
}

img, svg {
    display: block;
    max-width: 100%;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.15s;
}

a:hover {
    color: var(--accent-hover);
}

button {
    font: inherit;
    cursor: pointer;
    touch-action: manipulation;
}

p {
    text-wrap: pretty;
}

h1, h2, h3, h4 {
    text-wrap: balance;
    font-family: var(--font-display);
    letter-spacing: -0.02em;
}

/* ── Layout ─────────────────────────────────────────── */
.container {
    max-width: var(--container);
    margin-inline: auto;
    padding-left: max(var(--gutter), env(safe-area-inset-left));
    padding-right: max(var(--gutter), env(safe-area-inset-right));
}

.section {
    padding-block: clamp(48px, 8vw, var(--gap-2xl));
    position: relative;
    z-index: 1;
}

.stack {
    display: flex;
    flex-direction: column;
}

.stack > * + * {
    margin-top: var(--gap-md);
}

/* ── Typography ─────────────────────────────────────── */
h1 {
    font-size: var(--fs-h1);
    line-height: 1.1;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.03em;
}

h2 {
    font-size: var(--fs-h2);
    line-height: 1.15;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.025em;
}

h3 {
    font-size: var(--fs-h3);
    font-weight: 600;
    line-height: 1.3;
    margin: 0;
}

.lead {
    font-size: var(--fs-lead);
    line-height: 1.6;
    color: var(--muted);
    max-width: 56ch;
    margin: 0;
}

.lead-mt {
    margin: 16px auto 0;
}

.eyebrow {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 0 0 var(--gap-sm);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 5px 14px;
    border-radius: var(--radius-pill);
}

/* ══════════════════════════════════════════════════════
   TOP NAV — Frosted glass bar
   ══════════════════════════════════════════════════════ */
.topnav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: var(--glass-border);
    box-shadow: var(--glass-highlight);
}

.topnav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: 12px;
    padding-left: max(var(--gutter), env(safe-area-inset-left));
    padding-right: max(var(--gutter), env(safe-area-inset-right));
}

.topnav .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--fg);
    text-decoration: none;
    transition: opacity 0.15s;
}

.topnav .logo:hover {
    opacity: 0.8;
}

.topnav .logo em {
    font-style: normal;
    color: var(--accent);
}

.logo-icon {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
}

.topnav nav {
    display: flex;
    gap: var(--gap-lg);
}

.topnav nav a {
    font-size: 14px;
    font-weight: 500;
    color: var(--muted);
    transition: color 0.15s;
    letter-spacing: -0.01em;
}

.topnav nav a:hover {
    color: var(--fg);
}

.topnav-actions {
    display: flex;
    align-items: center;
    gap: 6px;
    position: relative;
}

.topnav-actions .icon-btn,
.topnav-actions .menu-btn {
    position: relative;
}

.topnav-actions .icon-btn::after,
.topnav-actions .menu-btn::after {
    content: attr(title);
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(-4px);
    padding: 6px 10px;
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    color: var(--fg);
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: var(--glass-shadow);
    z-index: 100;
}

.topnav-actions .icon-btn:hover::after,
.topnav-actions .menu-btn:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* Icon buttons */
.icon-btn, .menu-btn {
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: var(--radius);
    border: var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    color: var(--muted);
    transition: all 0.2s;
    box-shadow: var(--glass-shadow);
}

.icon-btn:hover, .menu-btn:hover {
    color: var(--fg);
    border-color: var(--border-strong);
    background: var(--surface-hover);
}

.icon-btn svg, .menu-btn svg, .icon-btn .icon-img, .menu-btn .icon-img {
    width: 16px;
    height: 16px;
}

.icon-img {
    width: 16px;
    height: 16px;
    color: inherit;
    vertical-align: middle;
}

.menu-btn {
    display: none;
}

/* ══════════════════════════════════════════════════════
   LANGUAGE DROPDOWN
   ══════════════════════════════════════════════════════ */
.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 160px;
    background: var(--glass-bg-strong);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius);
    box-shadow: var(--glass-shadow-lg);
    padding: 6px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    z-index: 1000;
}

.lang-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 8px;
    color: var(--fg);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.15s;
}

.lang-option:hover {
    background: var(--surface-hover);
    color: var(--accent);
}

.lang-option[aria-current="true"] {
    background: var(--accent-soft);
    color: var(--accent);
}

.lang-flag {
    font-size: 18px;
    line-height: 1;
}

.lang-name {
    white-space: nowrap;
}

/* ══════════════════════════════════════════════════════
   HERO
   ══════════════════════════════════════════════════════ */
.hero {
    padding-block: clamp(56px, 10vw, 100px) clamp(40px, 6vw, 64px);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero .badge {
    margin-bottom: var(--gap-md);
}

.hero h1 {
    margin-bottom: var(--gap-md);
}

.hero h1 span {
    color: var(--accent);
}

.hero .lead {
    margin: 0 auto var(--gap-lg);
}

.hero-features {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--gap-lg);
    flex-wrap: wrap;
    margin-top: var(--gap-lg);
}

.hero-feat {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: var(--fs-sm);
    color: var(--muted);
}

.hero-feat svg {
    width: 18px;
    height: 18px;
    color: var(--success);
    flex-shrink: 0;
}

/* ══════════════════════════════════════════════════════
   FORGE — The main workspace
   ══════════════════════════════════════════════════════ */
#forge {
    padding-block: clamp(48px, 8vw, 80px);
}

.forge-workspace {
    max-width: 780px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.forge-header {
    text-align: center;
    max-width: 48ch;
    margin: 0 auto var(--gap-xl);
}

.forge-header h2 {
    margin-bottom: var(--gap-sm);
}

/* Glass panel wrapping the two slots */
.forge-panel {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--glass-shadow-xl), var(--glass-highlight);
    padding: var(--gap-xl) var(--gap-lg);
    position: relative;
    overflow: hidden;
}

/* Connector between two slots */
.forge-connector {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: var(--gap-md) 0;
}

.forge-connector-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent-soft);
    display: grid;
    place-items: center;
    color: var(--accent);
    font-size: 18px;
    font-weight: 600;
    flex-shrink: 0;
}

.forge-connector-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
}

/* Two-slot grid */
.forge-slots {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--gap-lg);
}

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

    .forge-connector {
        margin: var(--gap-sm) 0;
    }

    .book-container-pdf {
        --book-width: 140px;
        --book-height: 196px;
    }

    .result-book .book-container {
        --book-width: 160px;
        --book-height: 224px;
    }

    .result-book-glow {
        width: 180px;
    }
}

/* ── Upload slot (glass card) ───────────────────────── */
.slot {
    position: relative;
    background: var(--surface);
    border: 1.5px dashed var(--border-strong);
    border-radius: var(--radius-lg);
    padding: 36px 20px 32px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    min-height: 280px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    touch-action: manipulation;
    overflow: hidden;
}

.slot:hover, .slot.dragover {
    border-color: var(--accent);
    background: var(--surface-hover);
    box-shadow: 0 0 0 4px var(--accent-soft), var(--glass-shadow-lg);
    transform: translateY(-2px);
}

.slot[data-type="img"]:hover, .slot[data-type="img"].dragover {
    border-color: var(--purple);
    box-shadow: 0 0 0 4px var(--purple-soft), var(--glass-shadow-lg);
}

.slot.loaded {
    border-style: solid;
    border-color: var(--border-strong);
    padding: 16px;
    background: var(--glass-bg-strong);
    box-shadow: var(--glass-shadow-lg);
}

.slot.loaded[data-type="pdf"] {
    border-color: var(--accent);
}

.slot.loaded[data-type="img"] {
    border-color: var(--purple);
}

.slot input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    z-index: 2;
}

.slot.loaded input[type="file"] {
    cursor: pointer;
}

/* Empty state */
.slot-icon {
    width: 52px;
    height: 52px;
    color: var(--muted-2);
    margin-bottom: 4px;
}

.slot-label {
    font-family: var(--font-display);
    font-size: 15px;
    font-weight: 600;
    color: var(--fg);
    letter-spacing: -0.01em;
}

.slot-hint {
    max-width: 80%;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--muted-2);
    letter-spacing: 0.04em;
}

.slot.loaded .slot-icon,
.slot.loaded .slot-label,
.slot.loaded .slot-hint {
    display: none;
}

/* ── Replace overlay (hover on loaded slot) ─────────── */
.slot-replace {
    display: none;
    position: absolute;
    inset: 0;
    z-index: 3;
    align-items: center;
    justify-content: center;
    background: oklch(0% 0 0 / 0.45);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border-radius: calc(var(--radius-lg) - 1px);
    opacity: 0;
    transition: opacity 0.25s;
    cursor: pointer;
}

.slot-replace-inner {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    background: oklch(100% 0 0 / 0.92);
    border-radius: var(--radius-pill);
    font-size: 14px;
    font-weight: 600;
    color: oklch(20% 0 0);
    box-shadow: 0 4px 16px oklch(0% 0 0 / 0.2);
}

.slot-replace-inner svg {
    width: 16px;
    height: 16px;
}

.slot.loaded .slot-replace {
    display: flex;
}

.slot.loaded:hover .slot-replace {
    opacity: 1;
}

/* Slot check mark */
.slot-check {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--success);
    color: oklch(100% 0 0);
    display: none;
    place-items: center;
    font-size: 12px;
    font-weight: 700;
    z-index: 4;
    box-shadow: 0 2px 8px oklch(52% 0.17 155 / 0.3);
}

.slot.loaded .slot-check {
    display: grid;
}

/* ── Book preview ───────────────────────────────────── */
.book-preview {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    width: 100%;
}

.slot.loaded .book-preview {
    display: flex;
}

/* ── 2D Book ────────────────────────────────────────── */
.book-container {
    display: flex;
    justify-content: center;
}

.book-container-pdf {
    --book-width: 160px;
    --book-height: 224px;
}

.book-container-result {
    --book-width: 220px;
    --book-height: 308px;
}

.book {
    width: var(--book-width);
    height: var(--book-height);
    position: relative;
    border-radius: 3px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1),
    0 10px 20px rgba(0, 0, 0, 0.15),
    0 20px 40px rgba(0, 0, 0, 0.1);
    animation: book-enter 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

@keyframes book-enter {
    from {
        transform: translateY(20px) scale(0.95);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.book:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.15),
    0 15px 30px rgba(0, 0, 0, 0.2),
    0 25px 50px rgba(0, 0, 0, 0.15);
}

.book-cover-front {
    width: 100%;
    height: 100%;
    position: relative;
}

.book-cover-front img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* ── Cover loading state ────────────────────────────── */
.cover-loading {
    position: absolute;
    inset: 0;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, oklch(90% 0.02 260), oklch(85% 0.03 280));
    gap: 12px;
}

.cover-loading.show {
    display: flex;
}

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid oklch(90% 0.02 260 / 0.3);
    border-top-color: oklch(57% 0.20 258);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    font-size: 11px;
    font-weight: 500;
    color: var(--muted);
    letter-spacing: 0.02em;
}

.book-cover-front::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg,
    rgba(255, 255, 255, 0.15) 0%,
    transparent 50%,
    rgba(0, 0, 0, 0.05) 100%);
    pointer-events: none;
}

/* Book spine effect - 2D */
.book::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 12px;
    height: 100%;
    background: linear-gradient(to right,
    rgba(0, 0, 0, 0.35) 0%,
    rgba(0, 0, 0, 0.15) 30%,
    rgba(255, 255, 255, 0.08) 45%,
    rgba(0, 0, 0, 0.05) 55%,
    transparent 100%);
    z-index: 1;
    pointer-events: none;
}

/* Book spine crease line */
.book::after {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(to bottom,
    transparent 0%,
    rgba(0, 0, 0, 0.15) 5%,
    rgba(0, 0, 0, 0.25) 15%,
    rgba(0, 0, 0, 0.3) 50%,
    rgba(0, 0, 0, 0.25) 85%,
    rgba(0, 0, 0, 0.15) 95%,
    transparent 100%);
    z-index: 2;
    pointer-events: none;
}

.book-filename {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--muted);
    word-break: break-all;
    max-width: 200px;
    text-align: center;
}

/* ── Picture frame preview (image slot loaded) ──────── */
.frame-preview {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    width: 100%;
}

.slot.loaded .frame-preview {
    display: flex;
}

.frame-art {
    position: relative;
    background: oklch(100% 0 0);
    border-radius: 4px;
    padding: 10px;
    box-shadow: var(--glass-shadow-lg),
    inset 0 0 0 1px oklch(90% 0.01 260);
    max-width: 180px;
    max-height: 220px;
}

[data-theme="dark"] .frame-art {
    background: oklch(24% 0.01 260);
    box-shadow: var(--glass-shadow-lg),
    inset 0 0 0 1px oklch(30% 0.01 260);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .frame-art {
        background: oklch(24% 0.01 260);
        box-shadow: var(--glass-shadow-lg),
        inset 0 0 0 1px oklch(30% 0.01 260);
    }
}

.frame-art img {
    width: 100%;
    height: 100%;
    max-height: 190px;
    object-fit: cover;
    border-radius: 2px;
    display: block;
}

.frame-filename {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--muted);
    word-break: break-all;
    max-width: 180px;
    text-align: center;
}

/* ── Forge actions ──────────────────────────────────── */
.forge-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    margin-top: var(--gap-lg);
}

.forge-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 48px;
    background: var(--accent);
    color: var(--on-accent);
    border: none;
    border-radius: var(--radius-pill);
    font-family: var(--font-display);
    font-size: 16px;
    font-weight: 600;
    letter-spacing: -0.01em;
    transition: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 0 4px 16px oklch(57% 0.20 258 / 0.3);
    position: relative;
    overflow: hidden;
}

.forge-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, oklch(100% 0 0 / 0.15) 0%, transparent 50%);
    border-radius: inherit;
    pointer-events: none;
}

.forge-btn:hover:not(:disabled) {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 28px oklch(57% 0.20 258 / 0.4);
    background: var(--accent-hover);
}

.forge-btn:active:not(:disabled) {
    transform: translateY(0) scale(0.98);
}

.forge-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    box-shadow: none;
}

.forge-btn svg {
    width: 18px;
    height: 18px;
    position: relative;
    z-index: 1;
}

.forge-btn span {
    position: relative;
    z-index: 1;
}

.forge-btn.loading {
    animation: btn-pulse 1.5s ease-in-out infinite;
}

@keyframes btn-pulse {
    0%, 100% {
        box-shadow: 0 4px 16px oklch(57% 0.20 258 / 0.3);
    }
    50% {
        box-shadow: 0 4px 32px oklch(57% 0.20 258 / 0.6);
    }
}

.forge-reset {
    font-family: var(--font-mono);
    font-size: var(--fs-sm);
    color: var(--muted);
    background: none;
    border: none;
    letter-spacing: 0.02em;
    transition: color 0.15s;
}

.forge-reset:hover {
    color: var(--fg);
}

/* ══════════════════════════════════════════════════════
   RESULT — Book with new cover + download
   ══════════════════════════════════════════════════════ */
.result {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    text-align: center;
    padding: var(--gap-xl) 0;
}

.result.show {
    display: flex;
}

.result-glass {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--glass-shadow-xl), var(--glass-highlight);
    padding: var(--gap-xl) var(--gap-lg);
    max-width: 420px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.result-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: var(--fs-xs);
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--success);
    background: var(--success-soft);
    padding: 5px 14px;
    border-radius: var(--radius-pill);
}

.result-badge svg {
    width: 14px;
    height: 14px;
}

/* ── Result Book — 2D ───────────────────────────────── */
.result-book {
    display: flex;
    justify-content: center;
}

.result-book .book-container {
    --book-width: 220px;
    --book-height: 308px;
}

.result-book .book {
    animation: result-enter 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes result-enter {
    from {
        transform: translateY(30px) scale(0.9);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.result-book .book:hover {
    transform: translateY(-8px) scale(1.03);
}


/* Success glow under book */
.result-book-glow {
    width: 260px;
    height: 60px;
    background: radial-gradient(ellipse, var(--accent) 0%, transparent 70%);
    opacity: 0.18;
    filter: blur(16px);
    margin-top: -24px;
    animation: glow-pulse 3s ease-in-out infinite;
}

@keyframes glow-pulse {
    0%, 100% {
        opacity: 0.14;
        transform: scale(1);
    }
    50% {
        opacity: 0.26;
        transform: scale(1.06);
    }
}

.result-title {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.result-meta {
    font-family: var(--font-mono);
    font-size: var(--fs-sm);
    color: var(--muted);
}

.dl-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 36px;
    background: var(--success);
    color: oklch(100% 0 0);
    border: none;
    border-radius: var(--radius-pill);
    font-family: var(--font-display);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.01em;
    transition: all 0.2s;
    box-shadow: 0 4px 16px oklch(52% 0.17 155 / 0.3);
}

.dl-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px oklch(52% 0.17 155 / 0.45);
}

.dl-btn svg {
    width: 16px;
    height: 16px;
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    background: transparent;
    color: var(--accent);
    border: 1.5px solid var(--accent);
    border-radius: var(--radius-pill);
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: -0.01em;
    transition: all 0.2s;
}

.btn-outline:hover {
    background: var(--accent);
    color: var(--on-accent);
    transform: translateY(-1px);
}

/* ══════════════════════════════════════════════════════
   DEVICES
   ══════════════════════════════════════════════════════ */
.dev-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

@media (max-width: 920px) {
    .dev-grid {
        grid-template-columns: 1fr;
    }
}

.dev-card {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 28px 22px 24px;
    transition: all 0.25s;
    box-shadow: var(--glass-shadow), var(--glass-highlight);
}

.dev-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--glass-shadow-lg), var(--glass-highlight);
    border-color: var(--accent);
}

.dev-card-badge {
    position: absolute;
    top: 12px;
    right: 14px;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 3px 10px;
    border-radius: var(--radius-pill);
}

.dev-card-icon {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    margin-bottom: 16px;
    border: var(--glass-border);
    border-radius: var(--radius);
    color: var(--accent);
    background: var(--accent-soft);
    box-shadow: var(--glass-shadow);
}

.dev-card-icon svg {
    width: 20px;
    height: 20px;
}

.dev-card h3 {
    font-size: 17px;
    font-weight: 600;
    letter-spacing: -0.015em;
    margin-bottom: 8px;
}

.dev-card p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.6;
}

/* ══════════════════════════════════════════════════════
   HOW IT WORKS
   ══════════════════════════════════════════════════════ */
.how-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

@media (max-width: 920px) {
    .how-steps {
        grid-template-columns: 1fr;
    }
}

.step-card {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 32px 22px 24px;
    box-shadow: var(--glass-shadow), var(--glass-highlight);
    transition: all 0.25s;
    overflow: hidden;
}

.step-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
}

.step-card::before {
    position: absolute;
    top: 14px;
    left: 18px;
    width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    background: var(--accent);
    border-radius: 50%;
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 700;
    color: var(--on-accent);
}

.step-card:nth-child(1)::before {
    content: '1';
}

.step-card:nth-child(2)::before {
    content: '2';
}

.step-card:nth-child(3)::before {
    content: '3';
}

.step-card h3 {
    margin-top: 24px;
    margin-bottom: 8px;
    font-family: var(--font-display);
    font-size: 17px;
    font-weight: 600;
}

.step-card p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.6;
}

/* ══════════════════════════════════════════════════════
   FAQ
   ══════════════════════════════════════════════════════ */
.faq-list {
    max-width: 680px;
    margin: 0 auto;
}

.faq-item {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius);
    margin-bottom: 8px;
    box-shadow: var(--glass-shadow), var(--glass-highlight);
    overflow: hidden;
}

.faq-q {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--gap-md);
    width: 100%;
    padding: 16px 20px;
    background: none;
    border: none;
    font-family: var(--font-display);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--fg);
    text-align: left;
    transition: color 0.15s;
    list-style: none;
}

.faq-q::-webkit-details-marker {
    display: none;
}

.faq-q:hover {
    color: var(--accent);
}

.faq-q svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    color: var(--muted-2);
    transition: transform 0.2s;
}

.faq-item[open] .faq-q svg {
    transform: rotate(45deg);
}

.faq-a {
    padding: 0 20px 16px;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.65;
    max-width: 60ch;
}

/* ══════════════════════════════════════════════════════
   CTA
   ══════════════════════════════════════════════════════ */
.cta-strip {
    text-align: center;
    padding-block: clamp(56px, 9vw, 100px);
}

.cta-glass {
    text-align: center;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--glass-shadow-xl), var(--glass-highlight);
    padding: var(--gap-xl) var(--gap-lg);
    max-width: 560px;
    margin: 0 auto;
}

.cta-glass h2 {
    margin-bottom: var(--gap-sm);
}

.cta-glass .lead {
    margin: 0 auto var(--gap-lg);
}

/* ══════════════════════════════════════════════════════
   FOOTER
   ══════════════════════════════════════════════════════ */
.pagefoot {
    padding-block: var(--gap-xl);
    padding-left: max(var(--gutter), env(safe-area-inset-left));
    padding-right: max(var(--gutter), env(safe-area-inset-right));
    color: var(--muted);
    font-size: var(--fs-sm);
    border-top: var(--glass-border);
    position: relative;
    z-index: 1;
}

/* ══════════════════════════════════════════════════════
   CANVAS (particles only)
   ══════════════════════════════════════════════════════ */
#particles {
    position: fixed;
    inset: 0;
    z-index: 100;
    pointer-events: none;
    display: none;
}

#particles.active {
    display: block;
}

/* ── Accessibility ──────────────────────────────────── */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

:focus {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 6px;
}

.forge-btn:focus-visible, .dl-btn:focus-visible, .btn-outline:focus-visible {
    outline-offset: 4px;
    box-shadow: 0 0 0 4px var(--accent-soft);
}

.slot:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
    border-color: var(--accent);
}

details summary:focus-visible {
    outline-offset: 4px;
}

/* ── Mobile hamburger ───────────────────────────────── */
@media (max-width: 640px) {
    :root {
        --gutter: 16px;
    }

    .menu-btn {
        display: grid;
    }

    .topnav nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--glass-bg-strong);
        backdrop-filter: var(--glass-blur);
        -webkit-backdrop-filter: var(--glass-blur);
        border-bottom: var(--glass-border);
        flex-direction: column;
        padding: 8px max(var(--gutter), env(safe-area-inset-left)) 16px;
        gap: 0;
        box-shadow: var(--glass-shadow-xl);
    }

    .topnav nav.open {
        display: flex;
    }

    .topnav nav a {
        padding: 14px 0;
        border-bottom: 1px solid var(--border);
        font-size: 15px;
    }

    .topnav nav a:last-child {
        border-bottom: none;
    }

    .topnav-inner {
        position: relative;
    }
}

/* ── Mobile: always-visible replace hint ───────────── */
@media (hover: none) and (pointer: coarse) {
    .slot.loaded .slot-replace {
        display: flex;
        opacity: 1;
        background: linear-gradient(to top, oklch(0% 0 0 / 0.55) 0%, oklch(0% 0 0 / 0.2) 60%, transparent 100%);
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        align-items: flex-end;
        padding-bottom: 12px;
    }

    .slot-replace-inner {
        padding: 8px 18px;
        font-size: 12px;
        background: oklch(100% 0 0 / 0.85);
        box-shadow: 0 2px 10px oklch(0% 0 0 / 0.15);
    }

    .slot.loaded {
        padding-bottom: 52px;
    }
}

/* ── Animations ─────────────────────────────────────── */
@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result.show {
    animation: fade-in-up 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ══════════════════════════════════════════════════════
   SHARE SECTION
   ══════════════════════════════════════════════════════ */
.share-strip {
    text-align: center;
    max-width: 560px;
    margin: 0 auto;
}

.share-btns {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 10px 18px;
    border-radius: var(--radius-pill);
    font-size: var(--fs-sm);
    font-weight: 600;
    border: 1px solid var(--border-strong);
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--fg);
    text-decoration: none;
    transition: all 0.2s;
    box-shadow: var(--glass-shadow);
    cursor: pointer;
}

.share-btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--glass-shadow-lg);
    color: var(--fg);
}

.share-x:hover {
    border-color: oklch(45% 0.02 0);
    background: oklch(20% 0.02 0);
    color: oklch(100% 0 0);
}

.share-fb:hover {
    border-color: oklch(50% 0.18 260);
    background: oklch(50% 0.18 260);
    color: oklch(100% 0 0);
}

.share-reddit:hover {
    border-color: oklch(58% 0.20 25);
    background: oklch(58% 0.20 25);
    color: oklch(100% 0 0);
}

.share-li:hover {
    border-color: oklch(50% 0.14 260);
    background: oklch(50% 0.14 260);
    color: oklch(100% 0 0);
}

.share-copy:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.share-copy.copied {
    border-color: var(--success);
    color: var(--success);
}

@media (max-width: 640px) {
    .share-btns {
        gap: 8px;
    }

    .share-btn {
        padding: 9px 14px;
        font-size: 12px;
    }

    .share-btn span {
        display: none;
    }

    .share-btn svg {
        width: 18px;
        height: 18px;
    }
}

/* ══════════════════════════════════════════════════════
   FOOTER — Two-column grid
   ══════════════════════════════════════════════════════ */
.foot-grid {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--gap-xl);
    flex-wrap: wrap;
}

.foot-brand {
    flex: 1 1 300px;
}

.foot-links {
    display: flex;
    align-items: center;
    gap: var(--gap-lg);
    flex-wrap: wrap;
}

.foot-links a {
    font-size: var(--fs-sm);
    color: var(--muted);
    transition: color 0.15s;
    text-decoration: none;
}

.foot-links a:hover {
    color: var(--fg);
}

.foot-feedback-btn {
    font-size: var(--fs-sm);
    color: var(--accent);
    background: none;
    border: none;
    padding: 0;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.15s;
}

.foot-feedback-btn:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* ══════════════════════════════════════════════════════
   FEEDBACK MODAL
   ══════════════════════════════════════════════════════ */
.feedback-overlay {
    position: fixed;
    inset: 0;
    z-index: 50;
    background: oklch(0% 0 0 / 0.45);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--gutter);
}

.feedback-overlay.open {
    display: flex;
}

.feedback-modal {
    background: var(--surface-solid);
    border: var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--glass-shadow-xl);
    width: 100%;
    max-width: 460px;
    position: relative;
    animation: fade-in-up 0.3s ease;
}

.feedback-modal-lark {
    max-width: 680px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

.feedback-lark-container {
    flex: 1;
    max-height: 720px;
    overflow: hidden;
    border-radius: var(--radius-xl);
    position: relative;
}

.feedback-header-mask {
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 60px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: var(--glass-border);
    border-top: none;
    border-right: none;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    z-index: 5;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 12px;
}

.feedback-close-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: var(--surface-hover);
    color: var(--muted);
    cursor: pointer;
    display: grid;
    place-items: center;
    transition: all 0.2s;
    font-size: 18px;
    line-height: 1;
}

.feedback-close-btn:hover {
    background: var(--accent-soft);
    color: var(--accent);
    transform: scale(1.1);
}

.feedback-loading {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    background: var(--surface-solid);
    z-index: 10;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.feedback-loading.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.feedback-spinner {
    position: relative;
    width: 60px;
    height: 60px;
}

.feedback-spinner-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 3px solid transparent;
    animation: feedback-spin 1.5s linear infinite;
}

.feedback-spinner-ring:nth-child(1) {
    border-top-color: var(--accent);
    animation-delay: 0s;
}

.feedback-spinner-ring:nth-child(2) {
    border-right-color: var(--accent-hover, #1558d6);
    animation-delay: 0.15s;
    width: 80%;
    height: 80%;
    top: 10%;
    left: 10%;
}

.feedback-spinner-ring:nth-child(3) {
    border-bottom-color: var(--accent-soft, rgba(26, 109, 255, 0.2));
    animation-delay: 0.3s;
    width: 60%;
    height: 60%;
    top: 20%;
    left: 20%;
}

@keyframes feedback-spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.feedback-loading-text {
    font-size: var(--fs-body);
    color: var(--muted);
    font-weight: 500;
    letter-spacing: 0.5px;
}

.feedback-lark-iframe {
    width: 100%;
    height: 100%;
    min-height: 720px;
    border: none;
    border-radius: var(--radius);
}

/* ══════════════════════════════════════════════════════
   TOAST NOTIFICATION
   ══════════════════════════════════════════════════════ */
.toast-container {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
    width: calc(100% - 32px);
    max-width: 480px;
}

.toast {
    background: var(--surface-solid);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    padding: 14px 20px;
    box-shadow: 0 8px 32px oklch(0% 0 0 / 0.25);
    display: flex;
    align-items: flex-start;
    gap: 12px;
    animation: toast-in 0.3s ease;
    pointer-events: auto;
    font-size: 14px;
    line-height: 1.5;
}

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

.toast-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    margin-top: 1px;
}

.toast-error {
    border-left: 3px solid var(--danger, #e74c3c);
}

.toast-error .toast-icon {
    color: var(--danger, #e74c3c);
}

.toast-warning {
    border-left: 3px solid var(--warning, #f39c12);
}

.toast-warning .toast-icon {
    color: var(--warning, #f39c12);
}

.toast-success {
    border-left: 3px solid var(--success, #27ae60);
}

.toast-success .toast-icon {
    color: var(--success, #27ae60);
}

.toast-msg {
    flex: 1;
    color: var(--fg);
}

.toast-close {
    flex-shrink: 0;
    background: none;
    border: none;
    color: var(--muted);
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    padding: 0;
    width: 20px;
    height: 20px;
    display: grid;
    place-items: center;
    border-radius: 4px;
    transition: color 0.15s;
}

.toast-close:hover {
    color: var(--fg);
}

@keyframes toast-in {
    from {
        opacity: 0;
        transform: translateY(-12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes toast-out {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-12px);
    }
}

/* ══════════════════════════════════════════════════════
   EXTRACTED INLINE STYLES → UTILITY CLASSES
   ══════════════════════════════════════════════════════ */
.text-center {
    text-align: center;
}

.mx-auto {
    margin-left: auto;
    margin-right: auto;
}

.devices-lead {
    text-align: center;
    max-width: 52ch;
    margin: 0 auto;
}

.devices-meta {
    text-align: center;
    max-width: 64ch;
    font-size: 13px;
    color: var(--muted);
    margin: 0 auto;
}

.how-header {
    text-align: center;
    max-width: 40ch;
    margin: 0 auto;
}

.faq-header {
    text-align: center;
    max-width: 36ch;
    margin: 0 auto 40px;
}

.cta-lead {
    margin: 12px auto 28px;
}

.share-lead {
    margin: 8px auto 24px;
}

.hero-lead {
    margin: 8px auto 0;
}

.foot-meta {
    color: var(--muted);
    margin: 6px 0 0;
    font-size: var(--fs-sm);
}

.devices-section-gap > * + * {
    margin-top: 32px;
}

.how-section-gap > * + * {
    margin-top: 40px;
}

.footer-desc {
    color: var(--muted);
    margin: 6px 0 0;
    font-size: var(--fs-sm);
}