:root {
    --bg-gradient: linear-gradient(135deg, #07070a 0%, #11111d 100%);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --accent: #38bdf8;
    --text: #f8fafc;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: -apple-system, sans-serif; -webkit-tap-highlight-color: transparent; }
body { background: var(--bg-gradient); color: var(--text); padding-bottom: 180px; min-height: 100vh; background-attachment: fixed; }

.glass-panel { background: var(--glass-bg); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border: 1px solid var(--glass-border); border-radius: 28px; box-shadow: 0 15px 35px rgba(0,0,0,0.4); }

header { padding: 30px 20px 15px; text-align: center; position: sticky; top: 0; z-index: 100; background: rgba(10, 10, 15, 0.8); backdrop-filter: blur(15px); }
header h1 { font-size: 1.6rem; font-weight: 800; color: #fff; text-shadow: 0 0 20px rgba(56, 189, 248, 0.4); }

.container { padding: 15px; }
.tabs { display: flex; padding: 5px; margin-bottom: 25px; border-radius: 50px; }
.tab-btn { flex: 1; background: none; border: none; color: #94a3b8; padding: 12px; font-weight: 700; border-radius: 50px; transition: 0.3s; }
.tab-btn.active { background: rgba(255,255,255,0.1); color: var(--accent); }

.media-grid { display: grid; gap: 20px; }
.media-card { background: var(--glass-bg); border-radius: 32px; overflow: hidden; border: 1px solid var(--glass-border); position: relative; }

/* Ẩn hoàn toàn thẻ audio/video controls mặc định trắng nhở nhạt */
video::-webkit-media-controls, audio::-webkit-media-controls { display: none !important; }
video { width: 100%; display: block; background: #000; aspect-ratio: 16/9; object-fit: cover; }

/* Custom Player Controls thay thế */
.custom-player-ui { position: absolute; top: 0; left: 0; right: 0; height: 160px; display: flex; justify-content: center; align-items: center; background: rgba(0,0,0,0.4); opacity: 0; transition: 0.3s; }
.media-card:hover .custom-player-ui { opacity: 1; }
.play-circle { width: 60px; height: 60px; border-radius: 50%; background: rgba(255,255,255,0.2); backdrop-filter: blur(5px); display: flex; justify-content: center; align-items: center; font-size: 1.5rem; color: #fff; border: 1px solid rgba(255,255,255,0.5); cursor: pointer; }

.media-info { padding: 20px; z-index: 2; position: relative; }
.media-info h3 { font-size: 1.1rem; margin-bottom: 5px; }
.audio-btn { background: var(--accent); color: #000; border: none; padding: 10px; border-radius: 14px; margin-top: 10px; width: 100%; font-weight: 700; cursor: pointer; }

.music-art { padding: 50px; text-align: center; background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(139, 92, 246, 0.2)); font-size: 4rem; position: relative; }

#mini-player { position: fixed; bottom: 95px; left: 15px; right: 15px; display: flex; align-items: center; padding: 12px; z-index: 150; }
.mini-art { width: 48px; height: 48px; border-radius: 15px; background: var(--accent); display: flex; justify-content: center; align-items: center; font-size: 1.5rem; }
.mini-info { flex: 1; margin-left: 12px; overflow: hidden; }
.mini-title { font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mini-controls { display: flex; gap: 10px; }
.mini-btn { background: none; border: none; color: #fff; font-size: 1.4rem; cursor: pointer; }

.tools-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
.tool-item { padding: 25px 10px; text-align: center; cursor: pointer; }

.bottom-nav { position: fixed; bottom: 15px; left: 15px; right: 15px; display: flex; justify-content: space-around; padding: 15px; z-index: 200; }
.nav-item { color: #94a3b8; font-size: 0.7rem; font-weight: 700; text-align: center; }
.nav-item.active { color: var(--accent); }

/* --- CSS BẢNG THÔNG BÁO CUSTOM CHUẨN SẾP --- */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.6); backdrop-filter: blur(8px); z-index: 9999; display: none; justify-content: center; align-items: center; padding: 20px; }
.modal-overlay.active { display: flex; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.alert-box { width: 100%; max-width: 320px; padding: 25px; text-align: center; transform: scale(0.9); animation: popUp 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; }
@keyframes popUp { to { transform: scale(1); } }
.alert-header { font-size: 1.1rem; font-weight: 800; color: var(--accent); margin-bottom: 12px; border-bottom: 1px solid var(--glass-border); padding-bottom: 10px; }
.alert-body { font-size: 0.95rem; line-height: 1.6; margin-bottom: 25px; color: #e2e8f0; }
.alert-btn { background: var(--accent); color: #000; border: none; padding: 12px 30px; border-radius: 20px; font-weight: 800; width: 100%; cursor: pointer; }

.modal-content { width: 100%; max-width: 350px; padding: 30px; }
.glass-input { width: 100%; background: rgba(0,0,0,0.5); border: 1px solid var(--glass-border); color: #fff; padding: 15px; border-radius: 18px; margin-bottom: 12px; }
.btn { flex: 1; padding: 15px; border-radius: 18px; border: none; font-weight: 800; cursor: pointer; }
.btn-primary { background: var(--accent); }
.btn-cancel { background: #333; color: #fff; }
.btn-success { background: #10b981; }