/* ===== 全局样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --accent: #10b981;
    --bg: #f8fafc;
    --bg-card: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --radius: 12px;
    --radius-sm: 8px;
}

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

a {
    color: var(--primary);
    text-decoration: none;
}

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

/* ===== 导航栏 ===== */
.navbar {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-logo span {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 8px;
    list-style: none;
}

.nav-links a {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    color: var(--text-light);
    font-weight: 500;
    font-size: 14px;
    transition: all 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    background: rgba(37, 99, 235, 0.08);
}

/* ===== 主内容区 ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px;
}

/* ===== 卡片 ===== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 24px;
    border: 1px solid var(--border);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title::before {
    content: '';
    width: 4px;
    height: 20px;
    background: linear-gradient(180deg, var(--primary), var(--accent));
    border-radius: 2px;
}

/* ===== Hero 区域 ===== */
.hero {
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 50%, #10b981 100%);
    color: white;
    border-radius: var(--radius);
    padding: 48px;
    margin-bottom: 32px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 300px;
    height: 300px;
    background: rgba(255,255,255,0.05);
    border-radius: 50%;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 12px;
}

.hero p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 24px;
}

.hero-tags {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.hero-tag {
    background: rgba(255,255,255,0.2);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 14px;
    backdrop-filter: blur(10px);
}

/* ===== 网格布局 ===== */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

@media (max-width: 768px) {
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
    .hero {
        padding: 32px 24px;
    }
    .hero h1 {
        font-size: 28px;
    }
}

/* ===== 信息项 ===== */
.info-item {
    display: flex;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.info-item:last-child {
    border-bottom: none;
}

.info-label {
    width: 100px;
    color: var(--text-light);
    font-size: 14px;
    flex-shrink: 0;
}

.info-value {
    flex: 1;
    font-size: 14px;
    font-weight: 500;
}

/* ===== 技能标签 ===== */
.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    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: var(--primary);
    color: white;
}

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

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

.btn-outline:hover {
    background: rgba(37, 99, 235, 0.08);
}

.btn-group {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ===== 代码展示 ===== */
.code-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
    border-bottom: 2px solid var(--border);
    padding-bottom: 0;
}

.code-tab {
    padding: 10px 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-light);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s;
}

.code-tab:hover {
    color: var(--primary);
}

.code-tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.code-block {
    background: #1e293b;
    color: #e2e8f0;
    border-radius: var(--radius-sm);
    padding: 20px;
    overflow-x: auto;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.7;
    display: none;
}

.code-block.active {
    display: block;
}

.code-block .keyword { color: #c084fc; }
.code-block .string { color: #86efac; }
.code-block .comment { color: #64748b; font-style: italic; }
.code-block .function { color: #60a5fa; }
.code-block .number { color: #fbbf24; }

/* ===== 上传区域 ===== */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--bg);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.03);
}

.upload-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.upload-text {
    color: var(--text-light);
    font-size: 14px;
}

.upload-text strong {
    color: var(--primary);
}

/* ===== 结果展示 ===== */
.result-area {
    margin-top: 24px;
    display: none;
}

.result-area.show {
    display: block;
}

.result-image {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
}

.result-label {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 4px;
}

.result-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 16px;
}

.result-confidence {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent);
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    display: inline-block;
}

/* ===== 方案选择 ===== */
.mode-selector {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.mode-option {
    flex: 1;
    padding: 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.mode-option:hover {
    border-color: var(--primary-light);
}

.mode-option.active {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
}

.mode-option h4 {
    font-size: 15px;
    margin-bottom: 4px;
}

.mode-option p {
    font-size: 12px;
    color: var(--text-light);
}

/* ===== 表格 ===== */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.data-table th {
    background: var(--bg);
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--text-light);
    border-bottom: 2px solid var(--border);
}

.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}

.data-table tr:hover td {
    background: rgba(37, 99, 235, 0.02);
}

/* ===== 状态徽章 ===== */
.badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: #f59e0b;
}

.badge-error {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.badge-info {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary);
}

/* ===== 统计卡片 ===== */
.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
    text-align: center;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-light);
}

/* ===== 加载动画 ===== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ===== 页脚 ===== */
.footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 24px;
    text-align: center;
    color: var(--text-light);
    font-size: 13px;
    margin-top: 48px;
}

/* ===== 时间线 ===== */
.timeline {
    position: relative;
    padding-left: 24px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    padding-bottom: 24px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -22px;
    top: 4px;
    width: 12px;
    height: 12px;
    background: var(--primary);
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 0 0 2px var(--primary);
}

.timeline-date {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 4px;
}

.timeline-title {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 4px;
}

.timeline-desc {
    font-size: 14px;
    color: var(--text-light);
}

/* ===== Hero 增强样式 ===== */
.hero-avatar {
    font-size: 64px;
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: 20px;
    opacity: 0.95;
    margin-bottom: 8px;
    font-weight: 500;
}

.hero-desc {
    font-size: 16px;
    opacity: 0.85;
    margin-bottom: 24px;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    flex-wrap: wrap;
}

.hero-actions .btn {
    padding: 12px 24px;
    font-size: 15px;
}

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

.hero-actions .btn-primary:hover {
    background: rgba(255,255,255,0.9);
    color: var(--primary-dark);
}

.hero-actions .btn-outline {
    background: transparent;
    color: white;
    border: 1px solid rgba(255,255,255,0.5);
}

.hero-actions .btn-outline:hover {
    background: rgba(255,255,255,0.1);
    color: white;
}

/* ===== 课程卡片网格 ===== */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

.course-item {
    background: var(--bg);
    border-radius: var(--radius-sm);
    padding: 20px 16px;
    border: 1px solid var(--border);
    transition: all 0.2s;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 80px;
}

.course-item:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.1);
    transform: translateY(-2px);
}

.course-name {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text);
    line-height: 1.4;
}

.course-tag {
    display: inline-block;
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent);
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    align-self: flex-start;
}

/* ===== 项目列表卡片 ===== */
.project-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.project-card {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--bg);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
    transition: all 0.2s;
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
}

.project-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: translateX(4px);
}

.project-card.project-completed {
    border-left: 4px solid var(--accent);
}

.project-card.project-planned {
    border-left: 4px solid #f59e0b;
    opacity: 0.85;
}

.project-card.project-planned:hover {
    opacity: 1;
}

.project-status {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 12px;
}

.project-completed .project-status {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent);
}

.project-planned .project-status {
    background: rgba(245, 158, 11, 0.1);
    color: #f59e0b;
}

.project-icon {
    font-size: 48px;
    flex-shrink: 0;
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.project-info {
    flex: 1;
    min-width: 0;
}

.project-name {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
}

.project-desc {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 12px;
}

.project-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.project-tags span {
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary);
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.project-arrow {
    font-size: 24px;
    color: var(--text-light);
    flex-shrink: 0;
    transition: all 0.2s;
}

.project-card:hover .project-arrow {
    color: var(--primary);
    transform: translateX(4px);
}

.project-planned .project-arrow {
    font-size: 13px;
    color: #f59e0b;
    background: rgba(245, 158, 11, 0.1);
    padding: 4px 10px;
    border-radius: 12px;
}

@media (max-width: 768px) {
    .project-card {
        flex-direction: column;
        text-align: center;
    }
    .project-tags {
        justify-content: center;
    }
    .project-arrow {
        display: none;
    }
    .course-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}