/* ══════════════════════════════════════════
   QSaver — Modern Video Downloader UI v4
   Light theme default + dark mode toggle
   ══════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

/* ── Light Theme (default) ── */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fb;
    --bg-card: #ffffff;
    --bg-card-hover: #f3f4f8;
    --bg-hero: linear-gradient(175deg, #f0f2ff 0%, #e8ecff 50%, #dfe4ff 100%);
    --bg-input: #f4f5f7;
    --bg-input-focus: #ffffff;
    --border: #e2e5ed;
    --border-hover: #c9cdd8;
    --text-primary: #1a1d26;
    --text-secondary: #5f6777;
    --text-muted: #8c94a6;
    --accent: #6c4cff;
    --accent-light: #8568ff;
    --accent-bg: rgba(108, 76, 255, 0.06);
    --accent-bg-hover: rgba(108, 76, 255, 0.12);
    --accent-glow: rgba(108, 76, 255, 0.12);
    --accent-glow-strong: rgba(108, 76, 255, 0.2);
    --accent-border: rgba(108, 76, 255, 0.25);
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.1);
    --shadow-glow: 0 0 40px rgba(108,76,255,0.08);
    --header-bg: rgba(255,255,255,0.85);
    --overlay-bg: rgba(0,0,0,0.3);
    --overlay-card-bg: #ffffff;
    --overlay-card-border: var(--border);
    --footer-bg: #f8f9fb;
    --result-thumb-bg: #f0f1f5;
    --nav-active-text: #fff;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    color-scheme: light;
}

/* ── Dark Theme ── */
[data-theme="dark"] {
    --bg-primary: #0a0d14;
    --bg-secondary: #10131c;
    --bg-card: rgba(255,255,255,0.035);
    --bg-card-hover: rgba(255,255,255,0.06);
    --bg-hero: linear-gradient(175deg, #0a0d14 0%, #0f1225 50%, #141835 100%);
    --bg-input: rgba(255,255,255,0.05);
    --bg-input-focus: rgba(255,255,255,0.07);
    --border: rgba(255,255,255,0.07);
    --border-hover: rgba(255,255,255,0.14);
    --text-primary: #f0f2f5;
    --text-secondary: #8b95a5;
    --text-muted: #5a6375;
    --accent: #7c5cfc;
    --accent-light: #9d85fc;
    --accent-bg: rgba(124,92,252,0.08);
    --accent-bg-hover: rgba(124,92,252,0.15);
    --accent-glow: rgba(124,92,252,0.12);
    --accent-glow-strong: rgba(124,92,252,0.25);
    --accent-border: rgba(124,92,252,0.3);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 8px 32px rgba(0,0,0,0.4);
    --shadow-lg: 0 16px 48px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 40px rgba(124,92,252,0.1);
    --header-bg: rgba(10,13,20,0.85);
    --overlay-bg: rgba(0,0,0,0.6);
    --overlay-card-bg: #151a2e;
    --overlay-card-border: rgba(124,92,252,0.15);
    --footer-bg: rgba(0,0,0,0.25);
    --result-thumb-bg: #111;
    --nav-active-text: #fff;
    color-scheme: dark;
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    min-height: 100vh;
    min-height: 100dvh;
    transition: background-color 0.3s ease, color 0.3s ease;
}
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-light); }
img { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; }
.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* ── Header ── */
.header {
    background: var(--header-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background var(--transition), border-color var(--transition);
}
.header .container {
    display: flex;
    align-items: center;
    height: 60px;
    gap: 12px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    flex-shrink: 0;
    letter-spacing: -0.3px;
}
.logo:hover { color: var(--text-primary); text-decoration: none; }
.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--accent), #6366f1);
    color: #fff;
    border-radius: 10px;
    font-size: 14px;
    box-shadow: 0 2px 12px var(--accent-glow);
    transition: transform var(--transition);
}
.logo:hover .logo-icon { transform: scale(1.05); }

.nav {
    display: flex;
    gap: 2px;
    flex: 1;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.nav::-webkit-scrollbar { display: none; }
.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition);
    white-space: nowrap;
}
.nav-link:hover {
    background: var(--accent-bg);
    color: var(--text-primary);
    text-decoration: none;
}
.nav-link.active {
    background: var(--accent);
    color: var(--nav-active-text);
    font-weight: 600;
    box-shadow: 0 2px 10px var(--accent-glow);
}

/* ── Theme Toggle ── */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
    color: var(--text-secondary);
}
.theme-toggle:hover {
    background: var(--accent-bg);
    border-color: var(--accent-border);
    color: var(--accent);
}
.theme-toggle svg { width: 20px; height: 20px; transition: transform 0.3s ease; }
.theme-toggle:hover svg { transform: rotate(30deg); }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

.tg-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    background: linear-gradient(135deg, #2563eb, #1d9bf0);
    color: #fff;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition);
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(37,99,235,0.15);
}
.tg-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(37,99,235,0.25);
    color: #fff;
    text-decoration: none;
}

/* ── Hero ── */
.hero {
    position: relative;
    background: var(--bg-hero);
    padding: 60px 0 52px;
    text-align: center;
    overflow: hidden;
    transition: background 0.3s ease;
}
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 600px;
    background: radial-gradient(ellipse, var(--accent-glow) 0%, transparent 65%);
    pointer-events: none;
    opacity: 0.5;
}

.hero h1 {
    position: relative;
    font-size: 42px;
    font-weight: 900;
    margin-bottom: 12px;
    letter-spacing: -0.8px;
    line-height: 1.15;
    color: var(--text-primary);
}
[data-theme="dark"] .hero h1 {
    background: linear-gradient(135deg, #fff 20%, var(--accent-light) 80%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-sub {
    position: relative;
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

/* ── Download Box ── */
.download-box {
    position: relative;
    max-width: 640px;
    margin: 0 auto 24px;
}
.input-row {
    display: flex;
    gap: 0;
    background: var(--bg-input);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 5px;
    transition: all 0.3s ease;
}
.input-row:focus-within {
    border-color: var(--accent-border);
    box-shadow: 0 0 0 4px var(--accent-glow), var(--shadow-md);
    background: var(--bg-input-focus);
}
.url-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 16px;
    padding: 14px 20px;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-primary);
    min-width: 0;
    font-family: inherit;
}
.url-input::placeholder { color: var(--text-muted); }

.fetch-btn {
    padding: 14px 36px;
    background: linear-gradient(135deg, var(--accent), #6366f1);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    box-shadow: 0 4px 16px var(--accent-glow);
    flex-shrink: 0;
    font-family: inherit;
}
.fetch-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px var(--accent-glow-strong);
    filter: brightness(1.08);
}
.fetch-btn:active { transform: translateY(0); }
.fetch-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; filter: none; }

.btn-loader {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2.5px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.error-msg {
    color: var(--error);
    font-size: 14px;
    font-weight: 500;
    margin-top: 14px;
    text-align: center;
    animation: fadeSlideIn 0.3s ease;
}
@keyframes fadeSlideIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── Result Card ── */
.result {
    position: relative;
    max-width: 640px;
    margin: 0 auto;
}
.result-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    text-align: left;
    animation: cardAppear 0.4s cubic-bezier(0.16,1,0.3,1);
    transition: border-color var(--transition), box-shadow var(--transition);
    box-shadow: var(--shadow-sm);
}
.result-card:hover { border-color: var(--border-hover); box-shadow: var(--shadow-md); }

@keyframes cardAppear {
    from { opacity: 0; transform: translateY(16px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.result-thumb {
    position: relative;
    width: 260px;
    min-height: 160px;
    flex-shrink: 0;
    overflow: hidden;
    background: var(--result-thumb-bg);
}
.result-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.result-card:hover .result-thumb img { transform: scale(1.03); }

.result-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.8);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 6px;
    font-variant-numeric: tabular-nums;
}
.result-info {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}
.result-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}
.result-uploader {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 16px;
    font-weight: 500;
}

/* ── Quality Buttons ── */
.quality-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: auto;
}
.q-btn {
    padding: 9px 18px;
    border: 1.5px solid var(--accent-border);
    background: var(--accent-bg);
    color: var(--accent);
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    font-family: inherit;
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}
.q-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent), #6366f1);
    opacity: 0;
    transition: opacity var(--transition);
    border-radius: inherit;
}
.q-btn:hover::before { opacity: 1; }
.q-btn:hover {
    color: #fff;
    border-color: var(--accent);
    box-shadow: 0 4px 16px var(--accent-glow);
    transform: translateY(-2px);
}
.q-btn span, .q-btn { position: relative; z-index: 1; }
.q-btn.loading { opacity: 0.5; cursor: wait; transform: none !important; }
.q-btn.loading::before { opacity: 0 !important; }

/* ── Platform Icons ── */
.platforms-row {
    display: flex;
    justify-content: center;
    gap: 14px;
    margin-top: 32px;
    position: relative;
}
.platform-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    transition: all var(--transition);
    text-decoration: none;
    box-shadow: var(--shadow-sm);
}
.platform-icon:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-hover);
}
.platform-icon.active {
    background: var(--accent-bg);
    border-color: var(--accent-border);
    box-shadow: 0 0 16px var(--accent-glow);
}
/* TikTok icon color fix */
[data-theme="dark"] .platform-icon svg path[fill="#000"] { fill: #fff; }

/* ── Sections ── */
.section {
    padding: 72px 0;
    position: relative;
}
.section-alt {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.section h2 {
    text-align: center;
    font-size: 30px;
    font-weight: 800;
    margin-bottom: 44px;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

/* ── Steps ── */
.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.step {
    text-align: center;
    padding: 32px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
    box-shadow: var(--shadow-sm);
}
.step:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--border-hover); }

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--accent), #6366f1);
    color: #fff;
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 18px;
    box-shadow: 0 4px 20px var(--accent-glow);
}
.step h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}
.step p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* ── Features ── */
.features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}
.feature {
    text-align: center;
    padding: 28px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
    box-shadow: var(--shadow-sm);
}
.feature:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--border-hover); }
.feature-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-bg);
    border-radius: 16px;
    transition: all var(--transition);
}
.feature:hover .feature-icon {
    box-shadow: 0 0 24px var(--accent-glow);
    transform: scale(1.05);
    background: var(--accent-bg-hover);
}
.feature-icon svg { width: 28px; height: 28px; }
.feature h3 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text-primary);
}
.feature p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.55;
}

/* ── FAQ ── */
.faq { max-width: 700px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-q {
    display: flex;
    width: 100%;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border: none;
    background: none;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    text-align: left;
    transition: color var(--transition);
    font-family: inherit;
    line-height: 1.4;
}
.faq-q:hover { color: var(--accent); }
.faq-q::after {
    content: '+';
    font-size: 24px;
    color: var(--text-muted);
    transition: all 0.3s ease;
    flex-shrink: 0;
    margin-left: 16px;
    font-weight: 300;
    line-height: 1;
}
.faq-q.open::after { transform: rotate(45deg); color: var(--accent); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-a.open { max-height: 300px; }
.faq-a p, .faq-a div {
    padding: 0 0 20px;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.75;
}

/* ── Footer ── */
.footer {
    background: var(--footer-bg);
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    padding: 52px 0 28px;
    transition: background var(--transition);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 36px;
}
.footer h4 {
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 14px;
}
.footer p { font-size: 14px; line-height: 1.65; }
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 10px; }
.footer ul a {
    color: var(--text-muted);
    font-size: 14px;
    transition: color var(--transition);
}
.footer ul a:hover { color: var(--accent); }
.tg-btn-small {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    padding: 9px 18px;
    background: linear-gradient(135deg, #2563eb, #1d9bf0);
    color: #fff;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    transition: all var(--transition);
}
.tg-btn-small:hover { transform: translateY(-1px); text-decoration: none; color: #fff; }
.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
}

/* ══════════════════════════════════════════
   Breadcrumbs
   ══════════════════════════════════════════ */
.breadcrumbs {
    padding: 12px 0;
    font-size: 13px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
}
.breadcrumbs a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition);
}
.breadcrumbs a:hover { color: var(--accent); }
.breadcrumb-sep {
    margin: 0 8px;
    color: var(--text-muted);
    opacity: 0.5;
}

/* ══════════════════════════════════════════
   Guide Pages
   ══════════════════════════════════════════ */
.guide-hero { padding: 48px 0 36px; }
.guide-hero h1 { font-size: 36px; }

.guide-meta {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-top: 20px;
    flex-wrap: wrap;
}
.guide-meta-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 6px 14px;
    border-radius: var(--radius-sm);
}
.guide-meta-item svg { opacity: 0.7; }

.guide-steps {
    max-width: 700px;
    margin: 0 auto;
}
.guide-step {
    display: flex;
    gap: 20px;
    margin-bottom: 32px;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}
.guide-step:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.guide-step-num {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    min-width: 48px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--accent), #6366f1);
    color: #fff;
    font-size: 20px;
    font-weight: 800;
    box-shadow: 0 4px 16px var(--accent-glow);
}
.guide-step-content h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.guide-step-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}
.guide-tip {
    margin-top: 12px;
    padding: 10px 14px;
    background: var(--accent-bg);
    border-left: 3px solid var(--accent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}
.guide-tip strong { color: var(--accent); }

.guide-content {
    max-width: 700px;
    margin: 0 auto;
}
.guide-content h2 {
    font-size: 24px;
    font-weight: 800;
    margin: 36px 0 16px;
    color: var(--text-primary);
    text-align: left;
}
.guide-content h2:first-child { margin-top: 0; }
.guide-content p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 14px;
}
.guide-content ul, .guide-content ol {
    padding-left: 24px;
    margin-bottom: 16px;
}
.guide-content li {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 8px;
}
.guide-content li strong { color: var(--text-primary); }

/* ══════════════════════════════════════════
   Download Overlay
   ══════════════════════════════════════════ */
#downloadOverlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
    animation: overlayFadeIn 0.25s ease;
}
@keyframes overlayFadeIn { from { opacity: 0; } to { opacity: 1; } }

.dl-overlay-backdrop {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: var(--overlay-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}
.dl-overlay-card {
    position: relative;
    background: var(--overlay-card-bg);
    border: 1px solid var(--overlay-card-border);
    border-radius: var(--radius-xl);
    padding: 40px 44px;
    text-align: center;
    max-width: 400px;
    width: 90%;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    animation: dlCardAppear 0.35s cubic-bezier(0.16,1,0.3,1);
}
@keyframes dlCardAppear {
    from { opacity: 0; transform: translateY(20px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.dl-spinner-ring {
    width: 56px;
    height: 56px;
    margin: 0 auto 24px;
}
.dl-spinner-ring svg {
    width: 100%;
    height: 100%;
    animation: spin 1.2s linear infinite;
}
.dl-spinner-ring circle {
    fill: none;
    stroke: var(--accent);
    stroke-width: 3;
    stroke-dasharray: 130;
    stroke-dashoffset: 40;
    stroke-linecap: round;
}

.dl-overlay-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.dl-overlay-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 6px;
    line-height: 1.55;
}
.dl-overlay-status {
    font-size: 13px;
    font-weight: 600;
    color: var(--warning);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}
.dl-overlay-status .pulse-dot {
    width: 8px;
    height: 8px;
    background: var(--warning);
    border-radius: 50%;
    animation: pulse 1.5s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(0.8); }
}

.dl-progress-track {
    width: 100%;
    height: 4px;
    background: var(--bg-input);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 24px;
}
.dl-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 2px;
    transition: width 30s linear;
}

.dl-overlay-cancel {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 10px 28px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}
.dl-overlay-cancel:hover {
    background: var(--accent-bg);
    color: var(--text-primary);
    border-color: var(--accent-border);
}

/* Success state */
.dl-overlay-card.success .dl-spinner-ring svg { animation: none; }
.dl-overlay-card.success .dl-spinner-ring circle {
    stroke: var(--success);
    stroke-dasharray: 160;
    stroke-dashoffset: 0;
    transition: all 0.5s ease;
}
.dl-overlay-card.success .dl-overlay-status { color: var(--success); }
.dl-overlay-card.success .dl-overlay-status .pulse-dot { background: var(--success); animation: none; }
.dl-overlay-card.success .dl-progress-bar {
    width: 100% !important;
    background: var(--success);
    transition: width 0.5s ease;
}

/* ══════════════════════════════════════════
   Responsive — Tablet
   ══════════════════════════════════════════ */
@media (max-width: 768px) {
    .container { padding: 0 16px; }
    .header .container { height: 52px; gap: 8px; }
    .logo { font-size: 17px; }
    .logo-icon { width: 32px; height: 32px; font-size: 12px; border-radius: 8px; }
    .nav-link { padding: 7px 12px; font-size: 13px; }
    .tg-btn { padding: 7px 14px; font-size: 12px; }
    .theme-toggle { width: 36px; height: 36px; }
    .theme-toggle svg { width: 18px; height: 18px; }

    .hero { padding: 40px 0 36px; }
    .hero h1 { font-size: 28px; }
    .hero-sub { font-size: 15px; margin-bottom: 28px; }

    .input-row { flex-direction: column; padding: 4px; border-radius: var(--radius-md); }
    .url-input { padding: 16px; font-size: 16px; }
    .fetch-btn { width: 100%; padding: 16px; border-radius: var(--radius-sm); font-size: 16px; min-height: 52px; }

    .result-card { flex-direction: column; }
    .result-thumb { width: 100%; height: 200px; }
    .result-info { padding: 16px; }
    .q-btn { min-height: 44px; padding: 10px 16px; font-size: 14px; }

    .steps { grid-template-columns: 1fr; gap: 12px; }
    .features { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .section { padding: 52px 0; }
    .section h2 { font-size: 24px; margin-bottom: 32px; }
    .platforms-row { gap: 10px; margin-top: 24px; }
    .platform-icon { width: 44px; height: 44px; }

    .guide-hero h1 { font-size: 26px; }
    .guide-step { flex-direction: column; gap: 14px; }
    .guide-meta { gap: 10px; }
    .guide-meta-item { font-size: 12px; padding: 5px 10px; }
    .guide-content h2 { font-size: 20px; }

    #downloadOverlay { align-items: flex-end; }
    .dl-overlay-card {
        max-width: 100%;
        width: 100%;
        border-radius: var(--radius-xl) var(--radius-xl) 0 0;
        padding: 32px 24px calc(24px + env(safe-area-inset-bottom));
        animation: dlSlideUp 0.35s cubic-bezier(0.16,1,0.3,1);
    }
    @keyframes dlSlideUp { from { transform: translateY(100%); } to { transform: translateY(0); } }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 24px; }
    .features { grid-template-columns: 1fr; }
    .q-btn { padding: 9px 14px; font-size: 13px; min-height: 44px; }
    .tg-btn { display: none; }
    .nav-link { padding: 7px 10px; font-size: 12px; }
}

@media (hover: none) and (pointer: coarse) {
    .q-btn { min-height: 48px; }
    .q-btn:active { transform: scale(0.96) !important; }
    .fetch-btn:active { transform: scale(0.97); }
    .step:hover, .feature:hover { transform: none; }
}

@supports (padding: max(0px)) {
    .header .container {
        padding-left: max(16px, env(safe-area-inset-left));
        padding-right: max(16px, env(safe-area-inset-right));
    }
}