:root {
    --primary: #10b981;
    --primary-hover: #059669;
    --text-main: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.85);
    --glass-bg: rgba(20, 25, 30, 0.45);
    --glass-border: rgba(255, 255, 255, 0.15);
    --glass-shadow: rgba(0, 0, 0, 0.4);
    --overlay-bg: rgba(0, 0, 0, 0.25);
    --hover-bg: rgba(255, 255, 255, 0.15);
    --text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

body.light-theme {
    --primary: #10b981;
    --primary-hover: #059669;
    --text-main: #1f2937;
    --text-muted: #374151;
    --glass-bg: rgba(255, 255, 255, 0.65);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: rgba(0, 0, 0, 0.1);
    --overlay-bg: rgba(255, 255, 255, 0.1);
    --hover-bg: rgba(0, 0, 0, 0.08);
    --text-shadow: 0 1px 2px rgba(255,255,255,0.7);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body {
    min-height: 100vh;
    color: var(--text-main);
    overflow-x: hidden;
    position: relative;
    transition: color 0.4s ease;
}

#dynamic-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    z-index: -2;
    transition: background-image 0.5s ease-in-out;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--overlay-bg);
    z-index: -1;
    transition: background 0.4s ease;
}

.app-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 4vw;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.glass-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 1rem 2.5rem;
    border-radius: 24px;
    box-shadow: 0 8px 32px var(--glass-shadow);
    margin-bottom: 2.5rem;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    transition: all 0.4s ease;
}

.brand h1 {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: 2px;
    text-shadow: var(--text-shadow);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-links {
    display: flex;
    gap: 0.5rem;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.4rem;
    border-radius: 30px;
    flex-wrap: wrap;
    justify-content: center;
}

body.light-theme .nav-links {
    background: rgba(255, 255, 255, 0.5);
}

.nav-btn {
    text-decoration: none;
    color: var(--text-main);
    padding: 0.6rem 2.2rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s;
    text-shadow: var(--text-shadow);
    white-space: nowrap;
}

.nav-btn.active {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    text-shadow: none;
}

.theme-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    padding: 0.8rem 1.2rem;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px var(--glass-shadow);
}

.theme-btn:hover {
    background: var(--primary);
    color: #fff;
    border-color: transparent;
}

.glass-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 0 10px 40px var(--glass-shadow);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    transition: all 0.4s ease;
}

.content-grid {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 2.5rem;
    flex: 1;
    width: 100%;
}

.player-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    height: fit-content;
    position: sticky;
    top: 2rem;
}

.record-container {
    margin-bottom: 2.5rem;
    width: 260px;
    height: 260px;
}

.record-disc {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: conic-gradient(#111, #222, #111, #222, #111);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 15px 35px rgba(0,0,0,0.6), inset 0 0 15px rgba(255,255,255,0.1);
    animation: spin 12s linear infinite;
    animation-play-state: paused;
    overflow: hidden;
}

.record-disc.custom-disc {
    background: none;
}

.record-disc.custom-disc .record-center {
    width: 30px;
    height: 30px;
    border: 3px solid rgba(255,255,255,0.8);
    background: rgba(0,0,0,0.5);
}

.record-disc.playing {
    animation-play-state: running;
}

.record-center {
    width: 75px;
    height: 75px;
    border-radius: 50%;
    background: var(--primary);
    border: 6px solid #0f0f0f;
    position: relative;
    transition: background 0.4s ease;
}

.record-center::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 14px;
    height: 14px;
    background: #fff;
    border-radius: 50%;
}

.record-disc.custom-disc .record-center::after {
    width: 8px;
    height: 8px;
}

@keyframes spin {
    100% { transform: rotate(360deg); }
}

.track-info {
    text-align: center;
    margin-bottom: 2rem;
    width: 100%;
}

.track-info h2 {
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 0.6rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-shadow: var(--text-shadow);
}

.track-info h3 {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 600;
    text-shadow: var(--text-shadow);
}

.progress-wrapper {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 1.2rem;
    margin-bottom: 2.5rem;
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 0.85rem;
    color: var(--text-main);
    font-weight: 600;
    text-shadow: var(--text-shadow);
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: rgba(150, 150, 150, 0.4);
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.2);
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--primary);
    border-radius: 6px;
    pointer-events: none;
    position: relative;
    transition: background 0.4s ease;
}

.progress-fill::after {
    content: '';
    position: absolute;
    right: -6px;
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    background: #fff;
    border-radius: 50%;
    box-shadow: 0 0 6px rgba(0,0,0,0.4);
}

.controls-wrapper {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.ctrl-btn {
    background: none;
    border: none;
    color: var(--text-main);
    cursor: pointer;
    opacity: 0.85;
    transition: all 0.2s;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.4));
}

body.light-theme .ctrl-btn {
    filter: drop-shadow(0 1px 2px rgba(255,255,255,0.6));
}

.ctrl-btn:hover {
    opacity: 1;
    transform: scale(1.1);
}

.play-btn {
    width: 72px;
    height: 72px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    transition: all 0.3s;
    filter: none;
}

body.light-theme .play-btn {
    filter: none;
}

.play-btn:hover {
    background: var(--primary-hover);
    transform: scale(1.05);
}

.mode-btn {
    font-size: 1.4rem;
    font-weight: 700;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--hover-bg);
    border: 1px solid var(--glass-border);
    filter: none;
}

.mode-btn:hover {
    background: var(--primary);
    color: #fff;
    border-color: transparent;
}

.speed-select {
    background: var(--hover-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    padding: 0.4rem 0.6rem;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    transition: all 0.3s;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23999'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    padding-right: 1.4rem;
}

.speed-select:hover {
    background-color: var(--primary);
    color: #fff;
    border-color: transparent;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23fff'/%3E%3C/svg%3E");
}

.speed-select option {
    background: #1a1a2e;
    color: #fff;
}

body.light-theme .speed-select {
    color: var(--text-main);
}

body.light-theme .speed-select option {
    background: #fff;
    color: #1f2937;
}

.volume-wrapper {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 1.2rem;
    padding: 0 1rem;
    color: var(--text-main);
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.4));
}

body.light-theme .volume-wrapper {
    filter: drop-shadow(0 1px 2px rgba(255,255,255,0.6));
}

.volume-wrapper input {
    flex: 1;
    height: 5px;
    -webkit-appearance: none;
    background: rgba(150, 150, 150, 0.4);
    border-radius: 3px;
    outline: none;
}

.volume-wrapper input::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: var(--text-main);
    cursor: pointer;
    transition: background 0.4s ease;
}

.playlist-panel {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 200px);
}

.search-box {
    margin-bottom: 1.5rem;
}

.search-box input {
    width: 100%;
    padding: 1.2rem 1.5rem;
    background: var(--hover-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    color: var(--text-main);
    font-size: 1rem;
    font-weight: 500;
    outline: none;
    transition: all 0.3s;
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-box input:focus {
    background: rgba(0, 0, 0, 0.4);
    border-color: var(--primary);
}

body.light-theme .search-box input:focus {
    background: rgba(255, 255, 255, 0.9);
}

.list-container {
    flex: 1;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.list-container::-webkit-scrollbar {
    width: 8px;
}

.list-container::-webkit-scrollbar-thumb {
    background: rgba(150, 150, 150, 0.5);
    border-radius: 4px;
}

.track-item {
    display: flex;
    align-items: center;
    padding: 1rem 1.2rem;
    border-radius: 16px;
    margin-bottom: 0.8rem;
    cursor: pointer;
    background: var(--hover-bg);
    transition: all 0.2s;
    border: 1px solid transparent;
}

.track-item:hover {
    transform: translateX(5px);
    background: rgba(150, 150, 150, 0.25);
}

.track-item.active {
    background: rgba(150, 150, 150, 0.25);
    border-left: 5px solid var(--primary);
    border-radius: 12px;
}

.item-index {
    width: 40px;
    font-family: ui-monospace, SFMono-Regular, monospace;
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 600;
    text-shadow: var(--text-shadow);
    flex-shrink: 0;
}

.track-item.active .item-index {
    color: var(--primary);
    text-shadow: none;
}

.item-info {
    flex: 1;
    overflow: hidden;
    min-width: 0;
}

.item-info h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.3rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-shadow: var(--text-shadow);
}

.item-info p {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
    text-shadow: var(--text-shadow);
}

.fav-btn {
    background: none;
    border: none;
    font-size: 1.4rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.3rem 0.5rem;
    transition: all 0.2s;
    opacity: 0.5;
    flex-shrink: 0;
}

.fav-btn:hover {
    opacity: 1;
    transform: scale(1.2);
}

.fav-btn.active {
    color: #ef4444;
    opacity: 1;
}

.comment-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--text-muted);
    cursor: pointer;
    opacity: 0.6;
    transition: all 0.2s;
    padding: 0.2rem 0.4rem;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.comment-btn:hover {
    opacity: 1;
    transform: scale(1.2);
    color: var(--primary);
}

.site-footer {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 2.5rem 0 1rem;
    margin-top: auto;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-main);
    letter-spacing: 1px;
    text-shadow: var(--text-shadow);
    text-align: center;
}

@media (max-width: 900px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
    .player-panel {
        position: relative;
        top: 0;
    }
    .playlist-panel {
        height: 500px;
    }
    .glass-nav {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem 1.5rem;
    }
    .header-actions {
        width: 100%;
        justify-content: center;
    }
    .brand h1 {
        font-size: 1.4rem;
    }
    .nav-btn {
        padding: 0.5rem 1.2rem;
        font-size: 0.85rem;
    }
    .glass-panel {
        padding: 1.5rem;
    }
    .record-container {
        width: 200px;
        height: 200px;
        margin-bottom: 1.5rem;
    }
    .track-info h2 {
        font-size: 1.3rem;
    }
    .controls-wrapper {
        gap: 1.5rem;
        margin-bottom: 1.5rem;
    }
    .play-btn {
        width: 60px;
        height: 60px;
    }
    .progress-wrapper {
        margin-bottom: 1.5rem;
    }
    .theme-btn {
        top: 10px;
        right: 10px;
        padding: 0.5rem 0.8rem;
        font-size: 0.8rem;
    }
    .app-wrapper {
        padding: 1rem 3vw;
    }
    .item-info h4 {
        font-size: 0.95rem;
    }
    .track-item {
        padding: 0.8rem 1rem;
    }
}

@media (max-width: 480px) {
    .nav-links {
        gap: 0.3rem;
        padding: 0.3rem;
    }
    .nav-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.78rem;
    }
    .record-container {
        width: 160px;
        height: 160px;
    }
    .controls-wrapper {
        gap: 1rem;
    }
    .play-btn {
        width: 52px;
        height: 52px;
    }
    .play-btn svg {
        width: 28px;
        height: 28px;
    }
    .mode-btn {
        width: 34px;
        height: 34px;
        font-size: 1.1rem;
    }
    .glass-panel {
        padding: 1.2rem;
        border-radius: 16px;
    }
    .search-box input {
        padding: 0.8rem 1rem;
        font-size: 0.9rem;
    }
    .playlist-panel {
        height: 400px;
    }
    .brand h1 {
        font-size: 1.2rem;
    }
    .glass-nav {
        padding: 0.8rem 1rem;
        border-radius: 16px;
        margin-bottom: 1.5rem;
    }
    .progress-wrapper {
        gap: 0.6rem;
        font-size: 0.75rem;
    }
    .volume-wrapper {
        padding: 0 0.5rem;
    }
    .track-item {
        padding: 0.6rem 0.8rem;
        margin-bottom: 0.5rem;
        border-radius: 12px;
    }
    .item-index {
        width: 30px;
        font-size: 0.85rem;
    }
    .item-info h4 {
        font-size: 0.88rem;
    }
    .item-info p {
        font-size: 0.78rem;
    }
    .fav-btn {
        font-size: 1.2rem;
        padding: 0.2rem 0.3rem;
    }
    .site-footer {
        padding: 1.5rem 0 0.5rem;
        font-size: 0.85rem;
    }
    .speed-select {
        padding: 0.3rem 0.4rem;
        font-size: 0.75rem;
        border-radius: 8px;
        padding-right: 1.2rem;
    }
}

.comments-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: 0 8px 32px var(--glass-shadow);
}
.comments-section h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-main);
}
.comment-sort-bar {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}
.comment-sort-btn {
    padding: 0.4rem 1rem;
    border: none;
    border-radius: 16px;
    background: var(--hover-bg);
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}
.comment-sort-btn.active {
    background: var(--primary);
    color: #fff;
}
.comment-input-area {
    display: flex;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
    align-items: flex-start;
}
.comment-input-area textarea {
    flex: 1;
    padding: 0.8rem 1rem;
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    background: var(--hover-bg);
    color: var(--text-main);
    font-size: 0.9rem;
    resize: vertical;
    min-height: 60px;
    max-height: 150px;
    outline: none;
    transition: border-color 0.2s;
}
.comment-input-area textarea:focus {
    border-color: var(--primary);
}
.comment-input-area button {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.2s;
}
.comment-input-area button:hover {
    background: var(--primary-hover);
}
.comment-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.comment-item {
    background: var(--hover-bg);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    padding: 1rem 1.2rem;
}
.comment-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.6rem;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
}
.comment-user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.comment-username {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-main);
}
.comment-ip-badge {
    padding: 0.12rem 0.45rem;
    border-radius: 6px;
    background: rgba(16, 185, 129, 0.12);
    color: var(--primary);
    font-size: 0.7rem;
    font-weight: 600;
}
.comment-time {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-left: auto;
}
.comment-content {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-main);
    margin-bottom: 0.6rem;
    word-break: break-all;
}
.comment-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}
.comment-actions button {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.8rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    transition: color 0.2s;
    font-weight: 600;
}
.comment-actions button:hover {
    color: var(--primary);
}
.comment-actions button.liked {
    color: #ef4444;
}
.comment-replies {
    margin-top: 0.8rem;
    padding-left: 1.2rem;
    border-left: 2px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}
.comment-reply-item {
    padding: 0.8rem 1rem;
    background: rgba(255,255,255,0.05);
    border-radius: 10px;
}
.comment-reply-input {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.6rem;
    align-items: center;
}
.comment-reply-input input {
    flex: 1;
    padding: 0.5rem 0.8rem;
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    background: var(--hover-bg);
    color: var(--text-main);
    font-size: 0.85rem;
    outline: none;
}
.comment-reply-input input:focus {
    border-color: var(--primary);
}
.comment-reply-input button {
    padding: 0.5rem 0.8rem;
    border: none;
    border-radius: 10px;
    background: var(--primary);
    color: #fff;
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
}
.comment-login-tip {
    text-align: center;
    padding: 1.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}
.comment-empty {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}