:root {
    --primary: #4a7c7d;
    --primary-hover: #3b6566;
    --accent: #8b93cb;
    --text-dark: #2c3e50;
    --text-sub: #5a6e7f;
    --glass-bg: rgba(255, 255, 255, 0.55);
    --glass-solid: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.75);
    --shadow: 0 8px 32px rgba(31, 38, 135, 0.08);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    padding: 0;
    font-family: 'Noto Sans SC', sans-serif;
    min-height: 100vh;
    color: var(--text-dark);
    background: url('../assets/bg-main.jpg') no-repeat center center fixed;
    background-size: cover;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.bg-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(240, 248, 246, 0.35);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: -1;
}

header {
    width: 90%;
    max-width: 1000px;
    margin: 30px auto 20px;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 24px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
}

.avatar-wrapper {
    position: relative;
}

.avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border: 3px solid white;
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
    object-fit: cover;
    transition: transform 0.3s ease;
}

.avatar:hover {
    transform: scale(1.08) rotate(5deg);
}

.vtuber-title {
    margin: 12px 0 4px;
    font-size: 26px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 1px;
}

.vtuber-bio {
    margin: 0 0 20px;
    font-size: 13px;
    color: var(--text-sub);
}

.btn-group {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 96px;
    padding: 9px 24px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid rgba(255, 255, 255, 0.9);
    background: rgba(255, 255, 255, 0.75);
    color: var(--primary);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 4px 14px rgba(74, 124, 125, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.6);
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 124, 125, 0.3);
}

.filter-panel {
    width: 90%;
    max-width: 1000px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 16px 20px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.search-bar {
    width: 100%;
    padding: 10px 16px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    outline: none;
    margin-bottom: 12px;
    transition: border 0.3s;
}

.search-bar:focus {
    border-color: var(--primary);
    background: white;
}

.filter-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
    margin-bottom: 10px;
}

.filter-row select {
    padding: 6px 12px;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.8);
    font-size: 13px;
    color: var(--text-dark);
    outline: none;
    cursor: pointer;
}

.initials-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 8px;
}

.initial-btn {
    border: none;
    background: rgba(255, 255, 255, 0.5);
    color: var(--text-dark);
    width: 26px;
    height: 26px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.initial-btn:hover, .initial-btn.active {
    background: var(--primary);
    color: white;
}

.song-container {
    width: 90%;
    max-width: 1000px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    min-height: 300px;
}

.song-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    padding: 16px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.03);
    transition: all 0.25s ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.song-card:hover {
    transform: translateY(-4px);
    background: var(--glass-solid);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.song-name {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.song-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--text-sub);
}

.song-genre {
    background: rgba(139, 147, 203, 0.15);
    color: var(--accent);
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 500;
}

.pagination {
    display: flex;
    gap: 8px;
    margin: 30px 0 50px;
    align-items: center;
}

.page-btn {
    padding: 6px 12px;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    color: var(--text-dark);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.page-btn:hover, .page-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.page-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.4);
    backdrop-filter: blur(6px);
    z-index: 200;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: white;
    padding: 30px;
    border-radius: 20px;
    text-align: center;
    max-width: 320px;
    width: 80%;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    animation: popIn 0.3s ease;
}

@keyframes popIn {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

#toast {
    visibility: hidden;
    background-color: var(--primary);
    color: #fff;
    text-align: center;
    border-radius: 20px;
    padding: 10px 20px;
    position: fixed;
    z-index: 300;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 13px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    opacity: 0;
    transition: opacity 0.3s, bottom 0.3s;
}

#toast.show {
    visibility: visible;
    opacity: 1;
    bottom: 40px;
}