/* ==================== 懒人记忆卡片 - 统一风格 ==================== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary: #667eea;
    --primary-dark: #764ba2;
    --accent: #f472b6;
    --text-primary: #333;
    --text-secondary: #666;
    --text-muted: #999;
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --border-color: #e8e8e8;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

html, body { height: 100%; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Microsoft YaHei', sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: var(--bg-color);
}

.main-content {
    flex: 1;
    padding: 20px;
    padding-bottom: 80px;
    background: var(--bg-color);
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

/* 顶部导航 */
.header {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    padding: 15px 20px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: white;
    font-size: 18px;
    font-weight: bold;
    text-decoration: none;
}

/* 底部导航 - 水平排列 */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    padding: 10px 0;
    z-index: 100;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 12px;
    padding: 5px 15px;
}

.nav-item.active {
    color: var(--primary);
}

.nav-item .icon {
    font-size: 22px;
}

/* 卡片样式 */
.card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 15px;
    box-shadow: var(--shadow);
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102,126,234,0.3);
}

.btn-outline {
    background: white;
    color: var(--primary);
    border: 1px solid var(--primary);
}

/* 表单 */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
    font-size: 14px;
    color: var(--text-primary);
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

/* 标签 */
.tag {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0,0,0,0.8);
    color: white;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 14px;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s;
}

.toast.show {
    opacity: 1;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state .icon {
    font-size: 48px;
    margin-bottom: 15px;
}

/* 加载 */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

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