:root {
    --bg: #0f1420;
    --bg-panel: rgba(18, 29, 45, 0.82);
    --text: #e8edf4;
    --muted: #9bb0c8;
    --line: rgba(145, 173, 203, 0.22);
    --accent: #19b6b3;
    --accent-2: #ffd166;
    --danger: #ff7b72;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 20% 20%, rgba(35, 106, 178, 0.22), transparent 45%),
        radial-gradient(circle at 80% 85%, rgba(14, 166, 131, 0.22), transparent 40%),
        linear-gradient(150deg, #070b12 0%, #0b1321 45%, #0f1a2b 100%);
}

.bg-glow {
    position: fixed;
    width: 38vw;
    height: 38vw;
    filter: blur(55px);
    opacity: 0.24;
    pointer-events: none;
    z-index: 0;
}

.bg-glow-a {
    top: -12vw;
    left: -6vw;
    background: #2a9df4;
}

.bg-glow-b {
    right: -10vw;
    bottom: -12vw;
    background: #13d6b1;
}

.page {
    position: relative;
    z-index: 1;
    max-width: 980px;
    margin: 0 auto;
    padding: 28px 20px 42px;
}

.hero {
    margin-bottom: 18px;
}

.back-link {
    display: inline-block;
    margin-bottom: 14px;
    color: var(--accent-2);
    text-decoration: none;
    font-weight: 600;
}

.back-link:hover {
    text-decoration: underline;
}

.hero h1 {
    margin: 0;
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    letter-spacing: 0.03em;
}

.hero p {
    margin: 10px 0 0;
    color: var(--muted);
    line-height: 1.65;
}

.composer-card,
.status-card,
.queue-card,
.result-card {
    background: var(--bg-panel);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 20px;
    backdrop-filter: blur(12px);
    margin-top: 16px;
}

.song-form {
    display: grid;
    gap: 10px;
}

.content-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(280px, 1fr);
    gap: 16px;
    align-items: start;
}

.side-panel {
    display: grid;
    gap: 16px;
}

.song-form label {
    color: #cce1f3;
    font-size: 0.95rem;
    font-weight: 600;
}

.song-form input,
.song-form textarea,
.song-form select {
    width: 100%;
    border: 1px solid rgba(132, 170, 208, 0.35);
    border-radius: 12px;
    background: rgba(9, 16, 28, 0.78);
    color: #eaf6ff;
    font-size: 0.96rem;
    padding: 12px 14px;
    resize: vertical;
}

.song-form input:focus,
.song-form textarea:focus,
.song-form select:focus {
    outline: 2px solid rgba(25, 182, 179, 0.45);
    border-color: rgba(25, 182, 179, 0.9);
}

.param-grid {
    margin-top: 8px;
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.field-wrap {
    display: grid;
    gap: 8px;
}

.actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 8px;
}

button {
    border: 0;
    border-radius: 999px;
    padding: 11px 22px;
    font-size: 0.96rem;
    font-weight: 700;
    cursor: pointer;
    color: #07221f;
    background: linear-gradient(110deg, #31dec0, #9dffce);
    transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

button:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(50, 222, 192, 0.25);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

button.secondary {
    color: #ffe3bf;
    background: linear-gradient(110deg, #9a6027, #db8c3f);
}

.status-card h2,
.queue-card h2,
.result-card h2 {
    margin: 0 0 10px;
    font-size: 1.2rem;
}

#status-text {
    margin: 0;
    color: #e5f4ff;
}

.status-extra {
    margin-top: 6px;
    font-size: 0.9rem;
    color: #9fb4c9;
}

.queue-card p {
    margin: 7px 0;
    color: #c8dbef;
    font-size: 0.95rem;
}

.queue-actions {
    margin: 2px 0 10px;
}

.queue-refresh-btn {
    font-size: 0.84rem;
    padding: 8px 14px;
}

.queue-main {
    font-size: 1rem;
}

.queue-main strong {
    color: #9dffce;
}

.queue-update {
    margin-top: 12px;
    color: #8fa8c0;
    font-size: 0.85rem;
}

.result-card audio {
    width: 100%;
    margin: 12px 0;
}

.download-link {
    display: inline-block;
    color: var(--accent-2);
    text-decoration: none;
    font-weight: 600;
}

.download-link:hover {
    text-decoration: underline;
}

.hidden {
    display: none;
}

.error {
    color: var(--danger);
}

@media (max-width: 720px) {
    .page {
        padding: 20px 14px 36px;
    }

    .content-grid {
        grid-template-columns: 1fr;
    }

    .composer-card,
    .status-card,
    .queue-card,
    .result-card {
        padding: 16px;
    }

    .actions {
        flex-direction: column;
    }

    .actions button {
        width: 100%;
    }

    .param-grid {
        grid-template-columns: 1fr;
    }
}