*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg: #FFFFFF;
    --bg-muted: #FFF7ED;
    --bg-dark: #0F172A;
    --surface: #FFFFFF;
    --surface-soft: #FFF7ED;
    --text: #0F172A;
    --text-muted: #64748B;
    --primary: #F97316;
    --primary-hover: #EA580C;
    --primary-light: #FFEDD5;
    --primary-glow: rgba(249, 115, 22, 0.18);
    --secondary: #EA580C;
    --secondary-hover: #C2410C;
    --secondary-light: #FED7AA;
    --secondary-glow: rgba(234, 88, 12, 0.18);
    --success: #16A34A;
    --warning: #F97316;
    --error: #EF4444;
    --border: #E5E7EB;
    --border-warm: #FED7AA;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius: 16px;
    --radius-lg: 24px;
    --shadow: 0 12px 35px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 22px 60px rgba(15, 23, 42, 0.14);
    --font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --container: 1180px;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #0B1120;
    --bg-muted: #121A2B;
    --bg-dark: #050816;
    --surface: #111827;
    --surface-soft: #182033;
    --text: #F8FAFC;
    --text-muted: #CBD5E1;
    --primary-light: rgba(249, 115, 22, 0.16);
    --secondary-light: rgba(234, 88, 12, 0.2);
    --border: rgba(255, 255, 255, 0.12);
    --border-warm: rgba(254, 215, 170, 0.28);
    --shadow: 0 12px 35px rgba(0, 0, 0, 0.28);
    --shadow-lg: 0 24px 70px rgba(0, 0, 0, 0.34);
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }

img, video { max-width: 100%; height: auto; display: block; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 760px; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-accent { color: var(--primary); }
.text-secondary { color: var(--secondary); }
.lead { font-size: 1.125rem; color: var(--text-muted); margin-top: 12px; line-height: 1.7; }
.mt-lg { margin-top: 48px; }
.mb-lg { margin-bottom: 32px; }

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 24px; border-radius: var(--radius-sm); font-weight: 700; font-size: 0.9375rem;
    border: 2px solid transparent; cursor: pointer; transition: all 0.2s ease;
    font-family: inherit; text-decoration: none;
}
.btn-primary { background: linear-gradient(135deg, #F97316, #EA580C); color: #fff; box-shadow: 0 12px 26px var(--primary-glow); }
.btn-primary:hover { background: linear-gradient(135deg, #EA580C, #C2410C); color: #fff; transform: translateY(-2px); box-shadow: 0 16px 34px var(--primary-glow); }
.btn-secondary { background: linear-gradient(135deg, #F97316, #EA580C); color: #fff; box-shadow: 0 12px 26px var(--secondary-glow); }
.btn-secondary:hover { background: linear-gradient(135deg, #EA580C, #C2410C); color: #fff; transform: translateY(-2px); }
.btn-outline { background: transparent; border-color: var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); transform: translateY(-2px); }
.btn-ghost { background: transparent; color: var(--text-muted); }
.btn-ghost:hover { color: var(--primary); }
.btn-sm { padding: 8px 16px; font-size: 0.875rem; }
.btn-lg { padding: 16px 32px; font-size: 1rem; }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.btn:focus-visible,
a:focus-visible,
button:focus-visible {
    outline: 3px solid var(--primary-glow);
    outline-offset: 3px;
}

.badge {
    display: inline-block; padding: 5px 12px; border-radius: 999px;
    font-size: 0.75rem; font-weight: 600; background: var(--primary-light); color: var(--secondary);
}
.badge-orange { background: var(--secondary-light); color: var(--secondary); }
.badge-success { background: #DCFCE7; color: #166534; }
.badge-preview { background: var(--primary-light); color: var(--secondary); }
.badge-video { background: var(--primary-light); color: var(--primary); }
.badge-text { background: var(--secondary-light); color: var(--secondary); }
.badge-audio { background: #FEF3C7; color: #92400E; }

.alert { padding: 14px 18px; border-radius: var(--radius); margin-bottom: 20px; }
.alert-success { background: #DCFCE7; color: #166534; }
.alert-warning { background: var(--primary-light); color: var(--secondary); }
.alert-error { background: #FEE2E2; color: #991B1B; }

.card { background: var(--surface); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); border: 1px solid var(--border); }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-weight: 500; margin-bottom: 6px; font-size: 0.875rem; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 10px;
    font-family: inherit; font-size: 1rem; background: var(--surface); color: var(--text); transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow);
}

.progress-bar { height: 6px; background: var(--bg-muted); border-radius: 999px; overflow: hidden; margin: 8px 0; }
.progress-bar-lg { height: 10px; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--primary), var(--secondary)); border-radius: 999px; transition: width 0.3s; }
.progress-text { font-size: 0.8125rem; color: var(--text-muted); }

.prose { line-height: 1.8; }
.prose h2 { margin: 32px 0 16px; }
.prose p { margin-bottom: 16px; }
.prose ol, .prose ul { margin: 0 0 16px 24px; }

.back-link { display: inline-block; margin-bottom: 16px; color: var(--text-muted); font-size: 0.875rem; }
.back-link:hover { color: var(--primary); }

.section { padding: 80px 0; }
.section-muted { background: var(--bg-muted); }
.section-dark { background: var(--bg-dark); color: #fff; }
.section-title { font-size: 2rem; font-weight: 700; margin-bottom: 12px; text-align: center; letter-spacing: 0; }
.section-subtitle { color: var(--text-muted); margin-bottom: 48px; text-align: center; max-width: 620px; margin-left: auto; margin-right: auto; font-size: 1.0625rem; }
.section-dark .section-subtitle { color: #A8A29E; }

.section-label {
    display: inline-block; font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.08em; color: var(--secondary); margin-bottom: 12px;
}
.section-header { text-align: center; margin-bottom: 48px; }