:root {
    --bg-primary: #07080f;
    --bg-secondary: #0d101d;
    --bg-card: rgba(18, 22, 41, 0.85);
    --bg-card-hover: rgba(26, 32, 58, 0.95);
    --bg-card-accent: rgba(24, 20, 52, 0.92);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-purple: #8b5cf6;
    --accent-pink: #ec4899;
    --accent-cyan: #06b6d4;
    --accent-green: #10b981;
    --border-color: rgba(148, 163, 184, 0.16);
    --border-glow: rgba(139, 92, 246, 0.45);
    --grad-main: linear-gradient(135deg, #8b5cf6 0%, #ec4899 50%, #06b6d4 100%);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.55);
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-card: rgba(255, 255, 255, 0.92);
    --bg-card-hover: #ffffff;
    --bg-card-accent: rgba(243, 232, 255, 0.65);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border-color: rgba(15, 23, 42, 0.12);
    --border-glow: rgba(139, 92, 246, 0.4);
    --shadow-lg: 0 16px 36px rgba(15, 23, 42, 0.08);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
}

.topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 64px;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 100;
}

.topbar__left, .topbar__center, .topbar__right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.back-btn {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.86rem;
    font-weight: 600;
    padding: 7px 13px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
}
.back-btn:hover { color: var(--text-primary); border-color: var(--accent-purple); }

.brand-title {
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-btn, .theme-toggle {
    width: 34px; height: 34px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.05rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
.nav-btn:hover, .theme-toggle:hover { border-color: var(--accent-purple); }

.slide-dots { display: flex; align-items: center; gap: 6px; }
.slide-dot {
    width: 8px; height: 8px;
    border-radius: 999px;
    border: none;
    background: var(--border-color);
    cursor: pointer;
    transition: all 0.25s;
}
.slide-dot.active { width: 22px; background: var(--accent-purple); }
.slide-counter { font-size: 0.8rem; color: var(--text-muted); font-weight: 600; min-width: 44px; text-align: center; }

.action-btn {
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 600;
    padding: 8px 14px;
    border-radius: 999px;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.action-btn--apk { border: 1px solid var(--border-color); color: var(--text-primary); background: var(--bg-secondary); }
.action-btn--apk:hover { border-color: var(--accent-cyan); }
.action-btn--web { background: var(--grad-main); color: #fff; font-weight: 700; }

.slides-viewport {
    margin-top: 64px;
    min-height: calc(100vh - 64px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 36px 24px 64px;
}

.slide { display: none; width: 100%; max-width: 1180px; margin: 0 auto; animation: fadeIn 0.35s ease; }
.slide.active { display: flex; flex-direction: column; justify-content: center; }
.slide-inner { width: 100%; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 28px; align-items: center; }
.slide-tag {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 700;
    background: rgba(139, 92, 246, 0.14);
    border: 1px solid var(--border-glow);
    color: var(--accent-purple);
    margin-bottom: 14px;
}

.slide-title {
    font-family: 'Outfit', sans-serif;
    font-size: clamp(2rem, 3.8vw, 3.1rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 14px;
}
.gradient-text {
    background: var(--grad-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.slide-subtitle {
    color: var(--text-secondary);
    font-size: 1.02rem;
    line-height: 1.6;
    max-width: 780px;
    margin-bottom: 24px;
}

.hero-cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 20px; }
.hero-btn {
    text-decoration: none;
    padding: 13px 22px;
    border-radius: 12px;
    font-weight: 700;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: transform 0.2s, box-shadow 0.2s;
}
.hero-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.hero-btn--primary { background: var(--grad-main); color: #fff; }
.hero-btn--apk { background: var(--bg-card); color: var(--text-primary); border: 1px solid var(--border-glow); }

.badge-list { display: flex; flex-wrap: wrap; gap: 8px; }
.badge-pill {
    font-size: 0.78rem;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 22px;
    box-shadow: var(--shadow-lg);
    transition: border-color 0.2s, transform 0.2s;
}
.card:hover { border-color: var(--border-glow); transform: translateY(-2px); }
.card--accent { background: var(--bg-card-accent); border-color: var(--border-glow); }
.card__icon { font-size: 1.8rem; margin-bottom: 10px; }
.card__title { font-family: 'Outfit', sans-serif; font-size: 1.12rem; font-weight: 700; margin-bottom: 8px; }
.card__desc { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.55; }

.check-list { display: flex; flex-direction: column; gap: 10px; }
.check-item { display: flex; align-items: flex-start; gap: 10px; font-size: 0.88rem; color: var(--text-secondary); line-height: 1.5; }
.check-icon { color: var(--accent-green); font-weight: 800; }

.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 24px; }
.stat-box { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 14px; padding: 18px; text-align: center; }
.stat-val { font-family: 'Outfit', sans-serif; font-size: 2rem; font-weight: 800; background: var(--grad-main); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.stat-lbl { color: var(--text-secondary); font-size: 0.82rem; margin-top: 4px; }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

.arch-flow { display: flex; align-items: center; justify-content: center; gap: 14px; margin-bottom: 24px; flex-wrap: wrap; }
.arch-node { background: var(--bg-card); border: 1px solid var(--border-glow); border-radius: 14px; padding: 14px 20px; text-align: center; min-width: 210px; }
.arch-node__title { font-weight: 700; font-size: 0.95rem; }
.arch-node__sub { font-size: 0.78rem; color: var(--text-secondary); margin-top: 4px; }
.arch-arrow { font-size: 1.4rem; color: var(--accent-purple); font-weight: 800; }

.kbd-hint { position: fixed; bottom: 14px; right: 20px; font-size: 0.75rem; color: var(--text-muted); background: var(--bg-card); padding: 6px 12px; border-radius: 999px; border: 1px solid var(--border-color); }

@media (max-width: 1024px) {
    .hero-grid, .grid-4, .stats-row { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .topbar { padding: 0 12px; }
    .brand-title, .kbd-hint { display: none; }
    .hero-grid, .grid-2, .grid-3, .grid-4, .stats-row { grid-template-columns: 1fr; }
}