/**
 * 智学AI教学系统 - 统一样式
 * Apple-inspired Glass Morphism Design
 */

/* ============================================
   CSS变量 - 全局配置 (Apple风格)
   ============================================ */
:root {
    /* Apple风格颜色 */
    --bg-base: #f5f5f7;
    --bg-elevated: rgba(255, 255, 255, 0.72);
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --text-tertiary: #a1a1a6;
    --accent-blue: #0071e3;
    --accent-blue-hover: #0077ed;
    --success: #34c759;
    --warning: #ff9500;
    --danger: #ff3b30;
    --glass-bg: rgba(255, 255, 255, 0.64);
    --glass-border: rgba(0, 0, 0, 0.06);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);

    /* 兼容旧变量 */
    --primary: #0071e3;
    --primary-dark: #0077ed;
    --primary-light: #4da3ff;
    --secondary: #34c759;
    --accent: #ff9500;
    --bg: #f5f5f7;
    --bg-sidebar: rgba(255, 255, 255, 0.8);
    --card: rgba(255, 255, 255, 0.72);
    --text: #1d1d1f;
    --text-light: #86868b;
    --text-muted: #a1a1a6;
    --border: rgba(0, 0, 0, 0.06);
    --border-focus: var(--accent-blue);

    /* 间距 */
    --input-height: 48px;
    --input-padding-x: 16px;
    --input-padding-y: 12px;
    --input-border-radius: 12px;
    --input-border-width: 1px;

    /* 按钮 */
    --btn-height: 48px;
    --btn-padding-x: 24px;
    --btn-padding-y: 14px;
    --btn-border-radius: 12px;

    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', 'Noto Sans SC', sans-serif;
    --font-display: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', 'Noto Sans SC', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}

/* ============================================
   表单元素统一样式
   ============================================ */

/* 输入框 */
input[type="text"],
input[type="password"],
input[type="number"],
input[type="email"],
input[type="tel"],
input[type="date"],
input[type="time"],
select,
textarea {
    width: 100%;
    height: var(--input-height);
    padding: var(--input-padding-y) var(--input-padding-x);
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--text);
    background: var(--card);
    border: var(--input-border-width) solid var(--border);
    border-radius: var(--input-border-radius);
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    appearance: none;
    -webkit-appearance: none;
}

/* 输入框聚焦状态 */
input[type="text"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="date"]:focus,
input[type="time"]:focus,
select:focus,
textarea:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.1);
}

/* 输入框placeholder */
input::placeholder,
textarea::placeholder {
    color: var(--text-light);
    opacity: 0.7;
}

/* 文本域 */
textarea {
    height: auto;
    min-height: 100px;
    resize: vertical;
    line-height: 1.6;
}

/* 下拉选择框 */
select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748B' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
    cursor: pointer;
}

/* ============================================
   按钮统一样式
   ============================================ */

/* 基础按钮 */
button,
.btn,
.action-btn,
.history-btn,
.copy-btn,
.generate-btn,
.primary-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: var(--btn-height);
    padding: var(--btn-padding-y) var(--btn-padding-x);
    font-size: 0.95rem;
    font-weight: 600;
    font-family: inherit;
    color: white;
    background: var(--primary);
    border: none;
    border-radius: var(--btn-border-radius);
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
}

button:hover,
.btn:hover,
.action-btn:hover,
.history-btn:hover,
.copy-btn:hover,
.generate-btn:hover,
.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 113, 227, 0.3);
}

button:active,
.btn:active,
.action-btn:active,
.history-btn:active,
.copy-btn:active,
.generate-btn:active,
.primary-btn:active {
    transform: translateY(0);
}

button:disabled,
.btn:disabled,
.action-btn:disabled,
.history-btn:disabled,
.copy-btn:disabled,
.generate-btn:disabled,
.primary-btn:disabled {
    background: var(--text-light);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* 次要按钮 */
.btn-secondary,
.action-btn,
.history-btn {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover,
.action-btn:hover,
.history-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: none;
}

/* 成功按钮 */
.btn-success {
    background: var(--secondary);
}

.btn-success:hover {
    background: #059669;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

/* 危险按钮 */
.btn-danger {
    background: var(--danger);
}

.btn-danger:hover {
    background: #DC2626;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

/* 小按钮 */
.btn-sm,
button.btn-sm {
    height: 36px;
    padding: 8px 16px;
    font-size: 0.85rem;
}

/* 大按钮 */
.btn-lg {
    height: 52px;
    padding: 14px 28px;
    font-size: 1.05rem;
}

/* ============================================
   生成按钮特殊样式
   ============================================ */
.generate-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

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

/* 卡片基础样式见下方「玻璃态卡片基础样式」章节 */

/* ============================================
   表单组
   ============================================ */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

/* ============================================
   徽章/标签
   ============================================ */
.card-badge {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    border-radius: 24px;
    font-size: 0.8rem;
    font-weight: 700;
}

.card-badge.pending {
    background: #FFF3E0;
    color: #E65100;
}

.card-badge.doing {
    background: #FFF8E1;
    color: #F57C00;
}

.card-badge.done {
    background: #E8F5E9;
    color: #2E7D32;
}

/* ============================================
   加载动画
   ============================================ */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: inline-block;
}

.spinner-lg {
    width: 48px;
    height: 48px;
    border-width: 4px;
}

/* ============================================
   链接
   ============================================ */
a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* ============================================
   玻璃态卡片基础样式
   ============================================ */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 16px;
    transition: all 0.25s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.glass-card:hover {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
    transform: translateY(-2px);
}

/* 兼容旧.card类 */
.card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: all 0.25s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.card:hover {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--glass-border);
}

.card-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ============================================
   侧边栏导航 - Apple风格
   ============================================ */
.layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 280px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--glass-border);
    padding: 1.5rem;
    position: fixed;
    height: 100vh;
    box-shadow: var(--glass-shadow);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    margin-bottom: 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: 14px;
    border: 1px solid var(--glass-border);
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: var(--accent-blue);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    box-shadow: 0 4px 12px rgba(0, 113, 227, 0.3);
}

.logo-text {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--text-primary);
}

.logo-text span {
    color: var(--accent-blue);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 1rem 1.25rem;
    border-radius: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.25, 0.1, 0.25, 1);
    margin-bottom: 0.375rem;
    font-size: 0.975rem;
    font-weight: 600;
}

.nav-item:hover {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent-blue);
    color: white;
    font-weight: 700;
    box-shadow: 0 4px 16px rgba(0, 113, 227, 0.3);
}

.nav-item .icon,
.nav-item span:first-child {
    font-size: 1.35rem;
}

/* ============================================
   主内容区
   ============================================ */
.main {
    flex: 1;
    margin-left: 280px;
    padding: 2rem;
}

/* ============================================
   响应式 - 移动端适配
   ============================================ */
.menu-toggle {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 200;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--accent-blue);
    color: white;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 113, 227, 0.3);
    align-items: center;
    justify-content: center;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 99;
}

@media (max-width: 768px) {
    .menu-toggle { display: flex; }

    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 150;
    }
    .sidebar.open { transform: translateX(0); }
    .sidebar-overlay.open { display: block; }

    .main {
        margin-left: 0 !important;
        padding: 1rem !important;
        padding-top: 4rem !important;
        max-width: 100% !important;
    }

    .header { padding: 0 1rem !important; }
    .header-content { height: 60px !important; }
    .logo-text { font-size: 1rem !important; }
    .user-name { display: none; }

    .welcome { padding: 1.5rem !important; border-radius: 18px !important; }
    .welcome h1 { font-size: 1.4rem !important; }
    .welcome-stats { gap: 1.5rem !important; flex-wrap: wrap; }
    .welcome-stat .num { font-size: 1.6rem !important; }

    /* 表格横向滚动 */
    .table-wrapper { overflow-x: auto; -webkit-overflow-scrolling: touch; }
    table { min-width: 500px; }

    /* 快捷功能 */
    .quick-grid { grid-template-columns: repeat(2, 1fr) !important; gap: 0.75rem !important; }
    .quick-btn { padding: 1rem 0.5rem !important; }

    .card {
        padding: 1rem;
        border-radius: 14px;
    }

    .form-row { grid-template-columns: 1fr; }

    input, select, textarea {
        font-size: 16px; /* 防止iOS自动缩放 */
    }

    button, .btn {
        height: 44px;
        font-size: 0.9rem;
    }

    /* 所有内联 Grid 布局强制单列 */
    [style*="grid-template-columns"] {
        grid-template-columns: 1fr !important;
    }

    /* 触摸友好的最小点击区域 */
    button, .btn, a, .nav-item, .tab, [onclick] {
        min-height: 44px;
        min-width: 44px;
    }

    /* 安全区域适配（iPhone刘海屏） */
    .header {
        padding-left: max(1rem, env(safe-area-inset-left));
        padding-right: max(1rem, env(safe-area-inset-right));
    }

    .main, .practice-container, .login-container {
        padding-left: max(1rem, env(safe-area-inset-left));
        padding-right: max(1rem, env(safe-area-inset-right));
        padding-bottom: max(1.5rem, env(safe-area-inset-bottom));
    }
}

/* 超小屏幕 */
@media (max-width: 480px) {
    .header {
        padding: 0 0.75rem;
    }
    .header-content {
        height: 52px;
    }
    .logo-icon {
        width: 28px;
        height: 28px;
        font-size: 0.9rem;
        border-radius: 6px;
    }
    .logo-text {
        font-size: 0.85rem;
    }
    .main {
        padding: 4.5rem 0.75rem 1rem;
    }
    .card {
        padding: 0.875rem;
        border-radius: 12px;
    }
    button, .btn {
        height: 42px;
        font-size: 0.85rem;
    }
}



/* 横屏优化 */
@media (max-height: 500px) and (orientation: landscape) {
    .header {
        height: 48px;
    }
    .header-content {
        height: 48px;
    }
    .main {
        padding-top: 4rem;
    }
    .hero {
        padding-top: 4rem;
        padding-bottom: 2rem;
    }
}