/* ========================================
   歌词打轴器 - 公共样式表
   ======================================== */

:root {
    --primary-color: #4a90e2;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
    --text-color: #1f2937;
    --text-secondary: #6b7280;
    --highlight-color: #dbeafe;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

/* ========================================
   通用组件样式
   ======================================== */

.card {
    background: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
}

.section-title::before {
    content: "";
    display: inline-block;
    width: 4px;
    height: 20px;
    background-color: var(--primary-color);
    margin-right: 0.5rem;
    border-radius: 2px;
}

.btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background-color: white;
    border-radius: 0.375rem;
    cursor: pointer;
    font-size: 0.875rem;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.btn-secondary { background-color: #6b7280; color: white; border-color: #6b7280; }
.btn-success { background-color: var(--success-color); color: white; border-color: var(--success-color); }
.btn-warning { background-color: var(--warning-color); color: white; border-color: var(--warning-color); }
.btn-danger { background-color: var(--danger-color); color: white; border-color: var(--danger-color); }

.btn:hover {
    opacity: 0.9;
}

/* ========================================
   表单与输入样式
   ======================================== */

textarea {
    width: 100%;
    min-height: 120px;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-family: inherit;
    resize: vertical;
    font-size: 0.9rem;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.file-input-hidden { display: none; }
.file-label {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: 0.375rem;
    cursor: pointer;
    font-size: 0.875rem;
    text-align: center;
    transition: background-color 0.2s;
}

.file-label:hover { background-color: #357abd; }

/* ========================================
   Toast 提示样式
   ======================================== */

.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    padding: 12px 20px;
    border-radius: 8px;
    color: white;
    font-size: 0.9rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    animation: slideIn 0.3s ease;
    max-width: 300px;
}

.toast.success { background-color: #10b981; }
.toast.error { background-color: #ef4444; }
.toast.warning { background-color: #f59e0b; }
.toast.info { background-color: #4a90e2; }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes slideOut {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(100%); opacity: 0; }
}

/* ========================================
   可访问性样式
   ======================================== */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ========================================
   警告与消息样式
   ======================================== */

.warning {
    color: var(--warning-color);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.message {
    padding: 0.75rem 1rem;
    border-radius: 0.375rem;
    margin-top: 1rem;
    font-size: 0.875rem;
}

.message.success {
    background-color: #d1fae5;
    color: #065f46;
}

.message.error {
    background-color: #fee2e2;
    color: #991b1b;
}