:root {
    --bg-color: #0d0f14;
    --bg-secondary: #151821;
    --card-bg: #1b1f2a;
    --text-main: #e6e8ec;
    --text-muted: #9aa1ac;
    --accent: #ff3b5c;
    --accent-hover: #ff5878;
    --border-color: #262b38;
    --radius: 14px;
    --transition: 0.25s ease;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
a { text-decoration: none; color: inherit; }

.site-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 50;
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; padding: 18px 24px; }
.logo { font-size: 22px; font-weight: 700; }
.logo span { color: var(--accent); }

nav a { margin-left: 28px; font-weight: 600; color: var(--text-muted); transition: color var(--transition); position: relative; }
nav a:hover, nav a.active { color: var(--text-main); }
nav a::after {
    content: ""; position: absolute; left: 0; bottom: -6px;
    width: 0; height: 2px; background-color: var(--accent); transition: width var(--transition);
}
nav a:hover::after, nav a.active::after { width: 100%; }

.hero {
    padding: 70px 0 40px;
    text-align: center;
    background: linear-gradient(-45deg, #0d0f14, #1a0f16, #0d0f14, #16101a);
    background-size: 400% 400%;
    animation: gradientShift 12s ease infinite;
}
@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
.hero h2, .hero p { opacity: 0; transform: translateY(20px); animation: fadeSlideUp 0.8s ease forwards; }
.hero p { animation-delay: 0.15s; color: var(--text-muted); }
.hero h2 { font-size: 36px; font-weight: 700; margin-bottom: 12px; }
@keyframes fadeSlideUp { to { opacity: 1; transform: translateY(0); } }

.about-section {
    padding: 20px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}
.about-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 40px; align-items: center; }
.about-text h2 { font-size: 28px; margin-bottom: 14px; }
.about-text p { color: var(--text-muted); margin-bottom: 24px; max-width: 560px; }
.stats-row { display: flex; gap: 36px; }
.stat-box { display: flex; flex-direction: column; }
.stat-number { font-size: 30px; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 13px; color: var(--text-muted); }
.about-social { display: flex; flex-direction: column; gap: 12px; }
.social-btn {
    padding: 12px 18px; border-radius: 10px; font-weight: 600; text-align: center; font-size: 14px;
    background-color: var(--card-bg); border: 1px solid var(--border-color);
    transition: transform var(--transition), border-color var(--transition), background-color var(--transition);
}
.social-btn:hover { transform: translateY(-3px); border-color: var(--accent); }
.social-btn.subscribe { background-color: var(--accent); border-color: var(--accent); color: #fff; }
.social-btn.subscribe:hover { background-color: var(--accent-hover); }

.section-title { font-size: 24px; margin-bottom: 24px; }

.video-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 28px; padding: 50px 0 80px; }

.video-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease, box-shadow var(--transition);
}
.video-card.visible { opacity: 1; transform: translateY(0); }
.video-card:hover { transform: translateY(-6px); box-shadow: 0 12px 30px rgba(0,0,0,0.45); }

.thumb-wrapper { position: relative; aspect-ratio: 16/9; overflow: hidden; }
.thumb-wrapper img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform var(--transition); background-color: #1f232e; }
.video-card:hover .thumb-wrapper img { transform: scale(1.06); }

.thumb-wrapper::after {
    content: ""; position: absolute; top: 0; left: -75%; width: 50%; height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255,255,255,0.15), transparent);
    transform: skewX(-20deg); transition: left var(--transition); pointer-events: none;
}
.video-card:hover .thumb-wrapper::after { left: 125%; transition: left 0.7s ease; }

.play-btn {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 54px; height: 54px; border-radius: 50%;
    background-color: rgba(255,59,92,0.9); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; opacity: 0;
    transition: opacity var(--transition), background-color var(--transition);
}
.video-card:hover .play-btn { opacity: 1; animation: pulse 1.4s ease infinite; }
.play-btn:hover { background-color: var(--accent-hover); }
@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(255,59,92,0.55); }
    70% { box-shadow: 0 0 0 12px rgba(255,59,92,0); }
    100% { box-shadow: 0 0 0 0 rgba(255,59,92,0); }
}

.video-info { padding: 16px 18px 20px; }
.video-info h3 {
    font-size: 16px; font-weight: 600; margin-bottom: 8px;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.video-date { font-size: 13px; color: var(--text-muted); }
.error-msg { color: var(--accent); font-weight: 600; padding: 40px 0; }

.site-footer { border-top: 1px solid var(--border-color); padding: 24px 0; text-align: center; color: var(--text-muted); font-size: 14px; }

#back-to-top {
    position: fixed; bottom: 28px; right: 28px; width: 46px; height: 46px; border-radius: 50%;
    background-color: var(--accent); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; cursor: pointer; opacity: 0; pointer-events: none; transform: translateY(10px);
    transition: opacity var(--transition), transform var(--transition), background-color var(--transition);
    z-index: 60;
}
#back-to-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
#back-to-top:hover { background-color: var(--accent-hover); }

.theme-toggle {
    margin-left: 24px; width: 40px; height: 22px; border-radius: 20px;
    background-color: var(--border-color); position: relative; cursor: pointer;
    transition: background-color var(--transition);
}
.theme-toggle::before {
    content: ""; position: absolute; top: 2px; left: 2px; width: 18px; height: 18px; border-radius: 50%;
    background-color: var(--accent); transition: transform var(--transition);
}
body.light-mode .theme-toggle::before { transform: translateX(18px); }

@media (max-width: 768px) {
    .about-grid { grid-template-columns: 1fr; }
    .stats-row { flex-wrap: wrap; gap: 24px; }
}
@media (max-width: 600px) {
    .hero h2 { font-size: 26px; }
    nav a { margin-left: 16px; font-size: 14px; }
}