/* ═══════════════════════════════════════
   ConvertStream — Stylesheet
   ═══════════════════════════════════════ */

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

:root {
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.2s ease;

    /* Light theme */
    --bg: #f8fafc;
    --bg-card: #ffffff;
    --bg-hover: #f1f5f9;
    --text: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: rgba(99,102,241,0.1);
    --accent: #06b6d4;
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px rgba(0,0,0,0.04);
    --hero-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a78bfa 100%);
}

[data-theme="dark"] {
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --primary-light: rgba(99,102,241,0.2);
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4);
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background var(--transition), color var(--transition);
}

main { flex: 1; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.hidden { display: none !important; }

/* ── Buttons ──────────────────────────── */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 10px 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--text);
    font-family: var(--font);
    font-size: 14px; font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}
.btn:hover { background: var(--bg-hover); }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-lg { padding: 14px 28px; font-size: 16px; font-weight: 600; }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-ghost { background: transparent; border-color: transparent; }
.btn-ghost:hover { background: var(--bg-hover); }
.btn-icon { width: 40px; height: 40px; padding: 0; border-radius: 50%; }
.btn-success { background: var(--success); color: #fff; border-color: var(--success); }

/* ── Navbar ───────────────────────────── */
.navbar {
    position: sticky; top: 0; z-index: 100;
    background: rgba(248,250,252,0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: background var(--transition);
}
[data-theme="dark"] .navbar { background: rgba(15,23,42,0.85); }

.navbar__inner { display: flex; align-items: center; height: 64px; gap: 24px; }
.navbar__logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-weight: 700; font-size: 18px; }
.navbar__links { display: flex; gap: 24px; margin-left: auto; }
.navbar__links a { text-decoration: none; color: var(--text-secondary); font-size: 14px; font-weight: 500; transition: color var(--transition); }
.navbar__links a:hover { color: var(--primary); }
.navbar__actions { display: flex; gap: 8px; margin-left: 16px; }
.navbar__burger { display: none; }

#lang-label { font-size: 13px; font-weight: 600; }

.mobile-nav { padding: 12px 20px 16px; display: flex; flex-direction: column; gap: 12px; border-bottom: 1px solid var(--border); }
.mobile-nav a { text-decoration: none; color: var(--text); font-weight: 500; padding: 8px 0; }

@media (max-width: 768px) {
    .navbar__links { display: none; }
    .navbar__burger { display: flex; }
}

/* ── Hero ─────────────────────────────── */
.hero {
    background: var(--hero-gradient);
    padding: 60px 0 50px;
    text-align: center;
    color: #fff;
}
.hero h1 { font-size: clamp(28px, 5vw, 44px); font-weight: 700; margin-bottom: 12px; }
.hero__sub { font-size: clamp(16px, 2.5vw, 20px); opacity: 0.9; max-width: 560px; margin: 0 auto; }

/* ── Converter Card ──────────────────── */
.converter-section { padding: 0 0 60px; margin-top: -30px; position: relative; z-index: 10; }
.converter-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 32px;
    border: 1px solid var(--border);
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
}
.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--primary);
    background: var(--primary-light);
}
.drop-zone__icon { color: var(--text-secondary); margin-bottom: 16px; }
.drop-zone.dragover .drop-zone__icon { color: var(--primary); }
.drop-zone__text { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.drop-zone__hint { font-size: 14px; color: var(--text-secondary); }

/* Format Panel */
.format-panel { margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--border); }
.format-row { display: flex; align-items: flex-end; gap: 16px; flex-wrap: wrap; }
.format-group { display: flex; flex-direction: column; gap: 6px; flex: 1; min-width: 140px; }
.format-group label { font-size: 13px; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.5px; }
.format-group select {
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 15px;
    cursor: pointer;
    transition: border-color var(--transition);
}
.format-group select:focus { outline: none; border-color: var(--primary); }
.format-arrow { font-size: 24px; color: var(--text-secondary); padding-bottom: 10px; }

@media (max-width: 640px) {
    .format-row { flex-direction: column; align-items: stretch; }
    .format-arrow { text-align: center; padding: 0; }
    #convert-btn { width: 100%; }
}

/* File Queue */
.file-queue { margin-top: 24px; display: flex; flex-direction: column; gap: 12px; }
.file-item {
    display: flex; align-items: center; gap: 16px;
    padding: 16px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}
.file-item__icon { font-size: 28px; flex-shrink: 0; }
.file-item__info { flex: 1; min-width: 0; }
.file-item__name { font-weight: 600; font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-item__meta { font-size: 13px; color: var(--text-secondary); }
.file-item__progress { width: 100%; margin-top: 8px; }
.file-item__progress-bar {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}
.file-item__progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    transition: width 0.3s ease;
    width: 0%;
}
.file-item__progress-fill.done { background: var(--success); }
.file-item__progress-fill.error { background: var(--error); }
.file-item__actions { flex-shrink: 0; display: flex; gap: 8px; }
.file-item__status { font-size: 13px; font-weight: 500; }
.file-item__status.uploading { color: var(--primary); }
.file-item__status.converting { color: var(--warning); }
.file-item__status.done { color: var(--success); }
.file-item__status.error { color: var(--error); }
.file-item__remove {
    background: none; border: none; color: var(--text-secondary); cursor: pointer; font-size: 20px; padding: 4px;
    transition: color var(--transition);
}
.file-item__remove:hover { color: var(--error); }

/* ── Formats Section ─────────────────── */
.formats-section { padding: 60px 0; }
.formats-section h2 { text-align: center; font-size: 28px; margin-bottom: 40px; }
.formats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 24px; }
.format-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}
.format-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.format-card__icon { font-size: 40px; margin-bottom: 12px; }
.format-card h3 { font-size: 18px; margin-bottom: 8px; }
.format-card__list { font-size: 13px; color: var(--text-secondary); line-height: 1.8; }

/* ── How It Works ────────────────────── */
.how-section { padding: 60px 0; background: var(--bg-card); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.how-section h2 { text-align: center; font-size: 28px; margin-bottom: 40px; }
.steps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 40px; text-align: center; }
.step__num {
    width: 48px; height: 48px;
    background: var(--hero-gradient);
    color: #fff; font-weight: 700; font-size: 20px;
    border-radius: 50%;
    display: inline-flex; align-items: center; justify-content: center;
    margin-bottom: 16px;
}
.step h3 { font-size: 18px; margin-bottom: 8px; }
.step p { font-size: 14px; color: var(--text-secondary); }

/* ── FAQ ──────────────────────────────── */
.faq-section { padding: 60px 0; }
.faq-section h2 { text-align: center; font-size: 28px; margin-bottom: 40px; }
.faq-list { max-width: 700px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: box-shadow var(--transition);
}
.faq-item[open] { box-shadow: var(--shadow); }
.faq-item summary {
    padding: 16px 20px;
    font-weight: 600; font-size: 15px;
    cursor: pointer;
    list-style: none;
    display: flex; justify-content: space-between; align-items: center;
}
.faq-item summary::after { content: '+'; font-size: 20px; color: var(--text-secondary); transition: transform var(--transition); }
.faq-item[open] summary::after { content: '−'; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item p { padding: 0 20px 16px; font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ── Footer ──────────────────────────── */
.footer { padding: 40px 0; border-top: 1px solid var(--border); margin-top: auto; }
.footer__inner { display: flex; flex-wrap: wrap; gap: 24px; justify-content: space-between; align-items: center; }
.footer__logo { font-weight: 700; font-size: 16px; color: var(--primary); }
.footer__brand p { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }
.footer__links { display: flex; gap: 20px; }
.footer__links a { font-size: 13px; color: var(--text-secondary); text-decoration: none; transition: color var(--transition); }
.footer__links a:hover { color: var(--primary); }
.footer__copy p { font-size: 12px; color: var(--text-secondary); }

/* ── Cookie Banner ───────────────────── */
.cookie-banner {
    position: fixed; bottom: 0; left: 0; right: 0; z-index: 200;
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    box-shadow: 0 -4px 12px rgba(0,0,0,0.1);
    padding: 16px 24px;
    display: flex; align-items: center; justify-content: space-between; gap: 16px;
    flex-wrap: wrap;
}
.cookie-banner p { font-size: 14px; color: var(--text-secondary); flex: 1; min-width: 200px; }
.cookie-actions { display: flex; gap: 8px; }

/* ── Animations ──────────────────────── */
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.file-item { animation: fadeIn 0.3s ease; }

@keyframes spin { to { transform: rotate(360deg); } }
.spinner { animation: spin 0.8s linear infinite; display: inline-block; }