/**
 * 高考学习系统 - 现代深色主题样式表
 */

/* ========== CSS 变量 ========== */
:root {
    --bg: #0f172a;
    --bg-secondary: #1e293b;
    --surface: rgba(255,255,255,0.07);
    --surface-hover: rgba(255,255,255,0.1);
    --surface-active: rgba(255,255,255,0.12);
    --border: rgba(255,255,255,0.1);
    --border-light: rgba(255,255,255,0.06);

    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --accent: #0ea5e9;
    --accent-hover: #0284c7;
    --accent-dim: #6366f1;

    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 10px;
    --radius-xs: 8px;
    --radius-round: 8px;

    --shadow: 0 8px 32px rgba(0,0,0,0.3);
    --shadow-sm: 0 4px 16px rgba(0,0,0,0.2);

    --font: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont,
             'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ========== 基础重置 ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }

.uni-body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--text-secondary); }

/* ========== 容器 ========== */
.uni-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* ========== 卡片 ========== */
.uni-card {
    background: var(--surface);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    padding: 24px;
    transition: all 0.3s ease;
}
.uni-card:hover {
    background: var(--surface-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.uni-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.uni-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
    background: var(--surface-active);
    color: var(--accent);
}

.uni-card-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text);
}

/* ========== 头部面板 ========== */
.uni-header {
    text-align: center;
    padding: 48px 24px;
    background: linear-gradient(135deg, rgba(14,165,233,0.2) 0%, rgba(99,102,241,0.2) 100%);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    margin-bottom: 32px;
    border: 1px solid var(--border);
}
.uni-header h1 {
    font-size: 2.5rem;
    margin-bottom: 16px;
    font-weight: 700;
}
.uni-header-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* ========== 按钮 ========== */
.uni-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-round);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    text-decoration: none;
    color: white;
    background: var(--accent-dim);
    transition: all 0.2s ease;
}
.uni-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.uni-btn-primary { background: var(--accent); color: white; }
.uni-btn-primary:hover { background: var(--accent-hover); }
.uni-btn-secondary { background: var(--accent-dim); }

/* ========== 统计卡片网格 ========== */
.uni-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.uni-stat-card {
    background: var(--surface);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    padding: 24px;
    text-align: center;
    transition: all 0.3s ease;
}
.uni-stat-card:hover {
    background: var(--surface-hover);
    transform: translateY(-2px);
}

.uni-stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
}
.uni-stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 8px;
}

/* ========== 进度条 ========== */
.uni-progress-bar {
    width: 100%;
    height: 8px;
    background: var(--surface-active);
    border-radius: 4px;
    overflow: hidden;
}
.uni-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-dim));
    width: 0%;
    transition: width 0.3s ease;
}

/* ========== 标签/徽章 ========== */
.uni-badge {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 500;
    background: var(--surface-active);
    color: var(--text-secondary);
}

/* ========== 表单 ========== */
.uni-input, .uni-select {
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    font-size: 0.9rem;
    color: var(--text);
    background: var(--surface);
    transition: all 0.2s ease;
}
.uni-input:focus, .uni-select:focus {
    border-color: var(--accent);
    outline: none;
    box-shadow: 0 0 0 3px rgba(14,165,233,0.2);
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .uni-container { padding: 15px; }
    .uni-header h1 { font-size: 1.8rem; }
    .uni-stats-grid { grid-template-columns: 1fr 1fr; }
    .uni-stat-value { font-size: 1.8rem; }
    .uni-card { padding: 20px; }
}