:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-dark: #0b0f19;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --accent: #ec4899;
    --accent-glow: rgba(236, 72, 153, 0.3);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* 动态背景发光 */
.background-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-glow) 0%, rgba(99, 102, 241, 0.05) 50%, transparent 70%);
    top: -200px;
    right: -200px;
    z-index: 0;
    border-radius: 50%;
    animation: pulse 10s infinite alternate ease-in-out;
}

@keyframes pulse {
    0% { transform: scale(1) translate(0, 0); }
    100% { transform: scale(1.2) translate(-50px, 50px); }
}

.container {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

header {
    text-align: center;
}

header h1 {
    font-size: 3rem;
    font-weight: 600;
    background: linear-gradient(to right, #fff, #a5b4fc, var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
}

header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

main {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 30px;
}

@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }
}

/* 玻璃拟态面板 */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 30px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-panel:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.upload-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.upload-area {
    border: 2px dashed var(--glass-border);
    border-radius: 16px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.3s ease, background-color 0.3s ease;
}

.upload-area:hover, .upload-area.drag-over {
    border-color: var(--primary);
    background-color: rgba(99, 102, 241, 0.05);
}

.upload-area .icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.upload-area p {
    color: var(--text-muted);
}

.upload-area span {
    color: var(--primary);
    font-weight: 600;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

select {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 12px;
    color: var(--text-main);
    font-family: inherit;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
    color: white;
    border: none;
    padding: 14px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.3s ease, transform 0.2s ease;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
}

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

.file-info {
    font-size: 0.9rem;
    color: var(--text-muted);
    word-break: break-all;
}

.result-section h2 {
    margin-bottom: 20px;
    font-weight: 600;
}

.status-message {
    color: var(--text-muted);
    text-align: center;
    padding: 40px;
}

#paper {
    background: white; /* 乐谱显示区域需要白底以保证清晰度 */
    color: black; /* 设置默认文字颜色为黑色 */
    border-radius: 16px;
    padding: 20px;
    min-height: 300px;
    display: none; /* 初始隐藏 */
}

/* 修复乐谱灰蒙蒙的问题，强制 SVG 元素使用黑色 */
#paper svg {
    fill: black;
    stroke: black;
}

#paper text {
    fill: black !important;
    stroke: none !important;
}

#paper path {
    stroke: black !important;
    fill: black !important;
}

footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: auto;
}