/* ============================================
   报销啦 - 主样式表
   配色：#3b82f6 (品牌蓝) + 白色 + 渐变强调
   ============================================ */

/* ---------- CSS 变量 ---------- */
:root {
    --primary: #1e3a5f;
    --primary-dark: #0f2440;
    --primary-light: #2d5a8e;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: #eff6ff;
    --orange: #f97316;
    --orange-hover: #ea580c;
    --green: #22c55e;
    --green-light: #f0fdf4;
    --red: #ef4444;
    --red-light: #fef2f2;
    --yellow: #eab308;
    --yellow-light: #fefce8;
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --text: #1e293b;
    --text-light: #64748b;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: all 0.3s ease;
}

/* ---------- Reset ---------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--text);
    background: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    display: block;
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    white-space: nowrap;
}

.btn-lg {
    padding: 14px 36px;
    font-size: 1.05rem;
    border-radius: var(--radius-lg);
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    color: var(--accent);
    border-color: var(--accent);
}

.btn-outline:hover {
    background: var(--accent);
    color: var(--white);
    transform: translateY(-2px);
}

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

.btn-white:hover {
    background: var(--gray-100);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline-white {
    background: transparent;
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.6);
}

.btn-outline-white:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--white);
    transform: translateY(-2px);
}

/* ---------- 导航栏 ---------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.3rem;
    color: var(--accent);
}

.logo-icon {
    font-size: 1.8rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--gray-700);
    position: relative;
    transition: var(--transition);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--accent);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: 16px;
}

.nav-actions .btn {
    padding: 8px 20px;
    font-size: 0.9rem;
}

/* 移动端菜单按钮 */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    transition: var(--transition);
}

.mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ---------- Hero 区 ---------- */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #0f2440 0%, #1a3a6b 40%, #1e5ab5 100%);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.2) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -20%;
    left: -5%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(34, 197, 94, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInUp 0.8s ease;
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 24px;
}

.hero-highlight {
    background: linear-gradient(90deg, #60a5fa, #22c55e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 36px;
    line-height: 1.8;
}

.text-bold {
    font-weight: 700;
    color: var(--white);
}

.hero-btns {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.hero-btns .btn-outline {
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.5);
}

.hero-btns .btn-outline:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--white);
    color: var(--white);
}

.hero-platforms {
    display: flex;
    gap: 16px;
    align-items: center;
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

.platform-badge {
    background: rgba(255, 255, 255, 0.1);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
}

/* Hero 截图模拟 - 报销管理界面 */
.hero-image {
    animation: fadeInUp 1s ease;
}

.hero-screenshot {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.screenshot-toolbar {
    display: flex;
    gap: 8px;
    align-items: center;
    padding: 12px 16px;
    background: var(--gray-100);
    border-bottom: 1px solid var(--gray-200);
}

.screenshot-title {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-left: 8px;
    font-weight: 500;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #22c55e; }

.screenshot-body {
    padding: 16px;
}

/* 报销汇总卡片 */
.mock-expense {
    font-size: 0.8rem;
    color: var(--text);
}

.expense-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 16px;
}

.summary-card {
    background: var(--gray-50);
    border-radius: var(--radius);
    padding: 12px;
    text-align: center;
    border: 1px solid var(--gray-100);
}

.summary-label {
    font-size: 0.7rem;
    color: var(--gray-500);
    margin-bottom: 6px;
}

.summary-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent);
}

.summary-value.pending {
    color: var(--orange);
}

.summary-value.approved {
    color: var(--green);
}

/* 报销表格 */
.expense-table {
    margin-bottom: 16px;
}

.expense-header,
.expense-row {
    display: grid;
    grid-template-columns: 2fr 0.8fr 1fr 0.8fr;
    gap: 4px;
    padding: 8px 4px;
    align-items: center;
}

.expense-header {
    background: var(--gray-100);
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.72rem;
    color: var(--gray-600);
}

.expense-row {
    border-bottom: 1px solid var(--gray-50);
    font-size: 0.76rem;
}

.expense-col {
    padding: 4px 2px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.col-wide {
    font-weight: 500;
}

.amount {
    font-weight: 600;
    color: var(--accent);
}

/* 状态标签 */
.status-tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.7rem;
    font-weight: 500;
}

.status-tag.approved {
    background: var(--green-light);
    color: var(--green);
}

.status-tag.pending {
    background: var(--yellow-light);
    color: #ca8a04;
}

.status-tag.rejected {
    background: var(--red-light);
    color: var(--red);
}

/* OCR扫描动画 */
.ocr-scanner {
    margin-top: 12px;
    padding: 10px;
    background: linear-gradient(135deg, #eff6ff, #f0fdf4);
    border-radius: var(--radius);
    border: 1px dashed var(--accent);
}

.ocr-invoice {
    position: relative;
    background: var(--white);
    border-radius: 6px;
    padding: 12px;
    border: 1px solid var(--gray-200);
    overflow: hidden;
}

.invoice-title {
    font-size: 0.8rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 6px;
    color: var(--accent);
}

.invoice-code {
    font-size: 0.65rem;
    color: var(--gray-400);
    text-align: center;
    margin-bottom: 8px;
}

.invoice-items {
    border-top: 1px solid var(--gray-100);
    padding-top: 8px;
}

.invoice-item {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    padding: 3px 0;
}

.ocr-scan-line {
    position: absolute;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent);
    opacity: 0.7;
    box-shadow: 0 0 8px rgba(59, 130, 246, 0.5);
    animation: scanDown 2s ease-in-out infinite;
}

.ocr-badge {
    text-align: center;
    margin-top: 8px;
    font-size: 0.75rem;
    color: var(--accent);
    font-weight: 600;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes scanDown {
    0%, 100% { top: 10%; }
    50% { top: 80%; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ---------- Section 通用 ---------- */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto;
}

.text-left {
    text-align: left;
    margin: 0 0 16px 0;
}

/* ---------- 核心功能 ---------- */
.features {
    background: var(--gray-50);
}

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

.feature-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 32px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--gray-100);
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent);
}

.feature-card-ai {
    border: 2px solid var(--accent);
    background: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--primary-dark);
}

.feature-desc {
    font-size: 0.95rem;
    color: var(--gray-500);
    line-height: 1.7;
}

.feature-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: linear-gradient(135deg, #f97316, #ef4444);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* ---------- 报销流程 ---------- */
.workflow {
    background: var(--white);
}

.workflow-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.workflow-step {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: 40px 28px;
    text-align: center;
    flex: 1;
    min-width: 240px;
    max-width: 300px;
    transition: var(--transition);
    border: 1px solid var(--gray-100);
    position: relative;
}

.workflow-step:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.step-number {
    position: absolute;
    top: 16px;
    left: 20px;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--gray-200);
}

.step-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.step-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--primary-dark);
}

.step-desc {
    font-size: 0.95rem;
    color: var(--gray-500);
    line-height: 1.7;
}

.workflow-arrow {
    font-size: 2rem;
    color: var(--accent);
    font-weight: 700;
}

.workflow-cta {
    text-align: center;
}

/* ---------- AI/OCR 智能识别 ---------- */
.ai-section {
    background: linear-gradient(135deg, #0f2440 0%, #1e3a5f 100%);
    color: var(--white);
}

.ai-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.ai-text .section-title {
    color: var(--white);
}

.ai-text .section-subtitle {
    color: rgba(255, 255, 255, 0.7);
}

.badge-ai {
    display: inline-block;
    background: rgba(59, 130, 246, 0.2);
    color: #60a5fa;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.ai-features-list {
    margin: 32px 0;
}

.ai-features-list li {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    align-items: flex-start;
}

.ai-check {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    background: rgba(34, 197, 94, 0.2);
    color: #22c55e;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 0.9rem;
    font-weight: 700;
    margin-top: 2px;
}

.ai-features-list strong {
    display: block;
    font-size: 1.05rem;
    margin-bottom: 4px;
}

.ai-features-list p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

/* AI 演示卡片 */
.ai-demo-card {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
}

.ai-chat-header {
    padding: 14px 20px;
    background: rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-weight: 600;
    font-size: 0.95rem;
}

.ai-chat-body {
    padding: 20px;
}

.ai-msg {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 12px;
    font-size: 0.9rem;
    line-height: 1.5;
    max-width: 85%;
}

.ai-msg.user {
    background: rgba(59, 130, 246, 0.3);
    margin-left: auto;
    text-align: right;
    border-radius: var(--radius) var(--radius) 4px var(--radius);
}

.ai-msg.bot {
    background: rgba(255, 255, 255, 0.1);
    margin-right: auto;
    border-radius: var(--radius) var(--radius) var(--radius) 4px;
}

.ai-project-preview {
    margin-top: 12px;
    padding: 12px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
}

.ai-task-row {
    padding: 6px 0;
    font-size: 0.85rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.ai-task-row:last-child {
    border-bottom: none;
}

.ai-task-row.done {
    color: #22c55e;
}

.ai-task-row.active {
    color: #f97316;
}

.ai-chat-input {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 16px;
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius);
}

.ai-chat-input span {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
}

.ai-chat-input button {
    background: var(--accent);
    color: white;
    border: none;
    padding: 6px 16px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.85rem;
}

/* ---------- 版本更新 ---------- */
.updates {
    background: var(--gray-50);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gray-200);
    border-radius: 2px;
}

.timeline-item {
    display: flex;
    gap: 24px;
    margin-bottom: 36px;
    position: relative;
}

.timeline-dot {
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 6px;
    position: relative;
    z-index: 1;
    margin-left: 14px;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
}

.timeline-content {
    background: var(--white);
    padding: 24px 28px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    flex: 1;
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.timeline-content:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(4px);
}

.timeline-date {
    font-size: 0.85rem;
    color: var(--gray-400);
    margin-right: 8px;
}

.timeline-version {
    display: inline-block;
    background: var(--accent);
    color: white;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.timeline-content h4 {
    font-size: 1.1rem;
    margin: 12px 0 8px;
    color: var(--primary-dark);
}

.timeline-content p {
    font-size: 0.9rem;
    color: var(--gray-500);
    line-height: 1.7;
}

/* ---------- 适用场景 ---------- */
.scenarios {
    background: var(--white);
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.scenario-card {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: 28px 20px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--gray-100);
    cursor: pointer;
}

.scenario-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
    background: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
}

.scenario-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.scenario-card span {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-dark);
}

/* ---------- 数据统计 ---------- */
.stats {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    padding: 80px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-item {
    color: var(--white);
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    background: linear-gradient(90deg, #60a5fa, #22c55e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-percent {
    font-size: 1.5rem;
}

.stat-label {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 8px;
}

.stat-plus {
    display: inline-block;
    color: #22c55e;
    font-weight: 800;
    font-size: 2rem;
    margin-left: 2px;
    -webkit-text-fill-color: #22c55e;
}

/* ---------- CTA ---------- */
.cta-section {
    background: linear-gradient(135deg, var(--accent) 0%, #2563eb 50%, #1d4ed8 100%);
    color: var(--white);
    text-align: center;
    padding: 80px 0;
}

.cta-section h2 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 36px;
}

.cta-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ---------- Footer ---------- */
.footer {
    background: var(--primary-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    color: var(--white);
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-col a {
    display: block;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    margin-bottom: 12px;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--accent);
    transform: translateX(4px);
}

.footer-col p {
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom p {
    margin-bottom: 4px;
}

/* ---------- 动画 ---------- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-btns {
        justify-content: center;
    }

    .hero-platforms {
        justify-content: center;
    }

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

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .ai-content {
        grid-template-columns: 1fr;
    }

    .ai-demo-card {
        max-width: 500px;
        margin: 0 auto;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .scenarios-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header {
        padding: 0;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: var(--shadow-xl);
        transform: translateY(-120%);
        transition: transform 0.3s ease;
        border-bottom: 1px solid var(--gray-200);
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .nav-actions {
        flex-direction: column;
        width: 100%;
        margin-left: 0;
    }

    .nav-actions .btn {
        width: 100%;
        text-align: center;
    }

    .mobile-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 2rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .workflow-steps {
        flex-direction: column;
    }

    .workflow-arrow {
        transform: rotate(90deg);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }

    .stat-number {
        font-size: 2.2rem;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .scenarios-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .section-title {
        font-size: 1.7rem;
    }

    section {
        padding: 60px 0;
    }

    .hero {
        padding: 120px 0 50px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6rem;
    }

    .hero-btns {
        flex-direction: column;
    }

    .btn-lg {
        width: 100%;
    }

    .expense-summary {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }

    .timeline::before {
        left: 8px;
    }

    .timeline-dot {
        margin-left: 0;
    }

    .container {
        padding: 0 16px;
    }
}

/* ============================================
   博客列表页
   ============================================ */

/* 页面头部 */
.page-hero {
    padding: 140px 0 60px;
    background: linear-gradient(135deg, #0f2440 0%, #1a3a6b 40%, #1e5ab5 100%);
    color: var(--white);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.2) 0%, transparent 70%);
    border-radius: 50%;
}

.page-hero-title {
    font-size: 2.4rem;
    font-weight: 800;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}

.page-hero-desc {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.7);
    position: relative;
    z-index: 1;
}

/* 分类标签 */
.blog-section {
    padding: 60px 0 100px;
    background: var(--gray-50);
}

.blog-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
    justify-content: center;
}

.blog-tab {
    padding: 10px 24px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 24px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.blog-tab:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.blog-tab.active {
    background: var(--accent);
    color: var(--white);
    border-color: var(--accent);
}

/* 文章卡片列表 */
.blog-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.blog-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: grid;
    grid-template-columns: 280px 1fr;
    border: 1px solid var(--gray-100);
}

.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent);
}

.blog-card-image {
    overflow: hidden;
    background: var(--gray-100);
}

.blog-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.blog-card:hover .blog-card-image img {
    transform: scale(1.05);
}

.blog-card-body {
    padding: 24px 28px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.blog-card-category {
    display: inline-block;
    background: var(--accent-light);
    color: var(--accent);
    padding: 3px 12px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.blog-card-date {
    font-size: 0.85rem;
    color: var(--gray-400);
}

.blog-card-title {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.5;
    margin-bottom: 10px;
}

.blog-card-title a {
    color: var(--primary-dark);
    transition: var(--transition);
}

.blog-card-title a:hover {
    color: var(--accent);
}

.blog-card-excerpt {
    font-size: 0.92rem;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card-footer {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--gray-400);
}

.blog-card-author {
    font-weight: 500;
}

/* 分页 */
.blog-pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 48px;
}

.pagination-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    background: var(--white);
    color: var(--gray-600);
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.pagination-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.pagination-btn.active {
    background: var(--accent);
    color: var(--white);
    border-color: var(--accent);
}

.pagination-btn.next {
    width: auto;
    padding: 0 16px;
}

/* ============================================
   文章详情页
   ============================================ */

/* 文章头部 */
.article-hero {
    padding: 140px 0 50px;
    background: linear-gradient(135deg, #0f2440 0%, #1a3a6b 40%, #1e5ab5 100%);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.article-hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.2) 0%, transparent 70%);
    border-radius: 50%;
}

.article-hero-inner {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.article-meta-top {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.article-back {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    transition: var(--transition);
}

.article-back:hover {
    color: var(--white);
}

.article-category-tag {
    display: inline-block;
    background: rgba(59, 130, 246, 0.3);
    color: #60a5fa;
    padding: 4px 14px;
    border-radius: 14px;
    font-size: 0.85rem;
    font-weight: 600;
}

.article-title {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.4;
    margin-bottom: 20px;
}

.article-info {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

/* 文章正文区域 */
.article-section {
    padding: 50px 0 80px;
    background: var(--white);
}

.article-container {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 60px;
    align-items: start;
}

.article-content {
    max-width: 780px;
}

.article-lead {
    font-size: 1.15rem;
    color: var(--gray-600);
    line-height: 1.9;
    margin-bottom: 32px;
    padding-left: 20px;
    border-left: 4px solid var(--accent);
}

.article-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin: 40px 0 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--gray-100);
}

.article-content h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin: 28px 0 12px;
}

.article-content p {
    font-size: 1rem;
    color: var(--gray-600);
    line-height: 1.9;
    margin-bottom: 16px;
}

.article-content ul {
    margin-bottom: 16px;
    padding-left: 0;
    list-style: none;
}

.article-content ul li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 10px;
    font-size: 1rem;
    color: var(--gray-600);
    line-height: 1.8;
}

.article-content ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
}

.article-content strong {
    color: var(--primary-dark);
    font-weight: 600;
}

/* 高亮引用块 */
.article-highlight-box {
    background: linear-gradient(135deg, #eff6ff, #ffffff);
    border: 1px solid var(--accent);
    border-left: 4px solid var(--accent);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    margin: 24px 0;
}

.article-highlight-box h4 {
    font-size: 1.05rem;
    color: var(--accent);
    margin-bottom: 8px;
}

.article-highlight-box p {
    margin-bottom: 0;
}

.article-highlight-box-green {
    background: linear-gradient(135deg, #f0fdf4, #ffffff);
    border-color: var(--green);
    border-left-color: var(--green);
}

.article-highlight-box-green h4 {
    color: var(--green);
}

/* 表格 */
.article-table-wrapper {
    overflow-x: auto;
    margin: 20px 0 24px;
}

.article-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.article-table thead {
    background: var(--primary-dark);
    color: var(--white);
}

.article-table th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
}

.article-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-100);
    color: var(--gray-600);
}

.article-table tbody tr:hover {
    background: var(--gray-50);
}

/* 文章CTA */
.article-cta {
    background: linear-gradient(135deg, var(--accent) 0%, #2563eb 100%);
    color: var(--white);
    border-radius: var(--radius-xl);
    padding: 36px 32px;
    text-align: center;
    margin: 40px 0 32px;
}

.article-cta h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--white);
}

.article-cta p {
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 24px;
}

.article-cta-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 文章标签 */
.article-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--gray-100);
}

.article-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--gray-50);
    color: var(--gray-500);
    border-radius: 20px;
    font-size: 0.85rem;
    transition: var(--transition);
    cursor: pointer;
}

.article-tag:hover {
    background: var(--accent-light);
    color: var(--accent);
}

/* 文章导航（上一篇/下一篇） */
.article-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--gray-100);
}

.article-nav-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 16px 20px;
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    border: 1px solid var(--gray-100);
}

.article-nav-item:hover {
    background: var(--accent-light);
    border-color: var(--accent);
    transform: translateX(4px);
}

.article-nav-next {
    text-align: right;
}

.article-nav-next:hover {
    transform: translateX(-4px);
}

.article-nav-label {
    font-size: 0.8rem;
    color: var(--gray-400);
    font-weight: 500;
}

.article-nav-title {
    font-size: 0.92rem;
    color: var(--primary-dark);
    font-weight: 600;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 侧边栏 */
.article-sidebar {
    position: sticky;
    top: 90px;
}

.sidebar-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-100);
}

.sidebar-author {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
}

.sidebar-author-avatar {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, var(--accent), #2563eb);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
}

.sidebar-author h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 2px;
}

.sidebar-author p {
    font-size: 0.85rem;
    color: var(--gray-400);
}

.sidebar-author-desc {
    font-size: 0.9rem;
    color: var(--gray-500);
    line-height: 1.7;
}

.sidebar-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 16px;
}

.sidebar-hot-list {
    list-style: none;
    padding: 0;
}

.sidebar-hot-list li {
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--gray-50);
}

.sidebar-hot-list li:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.sidebar-hot-list a {
    font-size: 0.9rem;
    color: var(--gray-600);
    transition: var(--transition);
    line-height: 1.5;
    display: block;
}

.sidebar-hot-list a:hover {
    color: var(--accent);
}

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

.sidebar-tag {
    display: inline-block;
    padding: 5px 14px;
    background: var(--gray-50);
    color: var(--gray-500);
    border-radius: 16px;
    font-size: 0.82rem;
    transition: var(--transition);
}

.sidebar-tag:hover {
    background: var(--accent);
    color: var(--white);
}

/* ============================================
   响应式 - 博客页
   ============================================ */
@media (max-width: 1024px) {
    .article-container {
        grid-template-columns: 1fr;
    }

    .article-sidebar {
        position: static;
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }

    .sidebar-card {
        margin-bottom: 0;
    }
}

@media (max-width: 768px) {
    .blog-card {
        grid-template-columns: 1fr;
    }

    .blog-card-image {
        height: 200px;
    }

    .page-hero-title {
        font-size: 1.8rem;
    }

    .article-title {
        font-size: 1.6rem;
    }

    .article-info {
        gap: 12px;
    }

    .article-sidebar {
        grid-template-columns: 1fr;
    }

    .article-nav {
        grid-template-columns: 1fr;
    }

    .article-cta-btns {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .blog-tabs {
        gap: 8px;
    }

    .blog-tab {
        padding: 8px 16px;
        font-size: 0.85rem;
    }

    .blog-card-body {
        padding: 16px 18px;
    }

    .blog-card-title {
        font-size: 1.1rem;
    }

    .page-hero {
        padding: 120px 0 40px;
    }

    .article-hero {
        padding: 120px 0 40px;
    }
}

/* ============================================
   首页 - 最新文章板块
   ============================================ */

.home-blog {
    padding: 80px 0 100px;
    background: var(--gray-50);
}

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

.home-blog-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-100);
}

.home-blog-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent);
}

.home-blog-card-img {
    height: 180px;
    overflow: hidden;
    background: var(--gray-100);
}

.home-blog-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.home-blog-card:hover .home-blog-card-img img {
    transform: scale(1.06);
}

.home-blog-card-body {
    padding: 20px 24px 24px;
}

.home-blog-card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.home-blog-category {
    display: inline-block;
    background: var(--accent-light);
    color: var(--accent);
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 0.78rem;
    font-weight: 600;
}

.home-blog-date {
    font-size: 0.82rem;
    color: var(--gray-400);
}

.home-blog-card-body h3 {
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.5;
    margin-bottom: 8px;
}

.home-blog-card-body h3 a {
    color: var(--primary-dark);
    transition: var(--transition);
}

.home-blog-card-body h3 a:hover {
    color: var(--accent);
}

.home-blog-card-body p {
    font-size: 0.88rem;
    color: var(--gray-500);
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.home-blog-more {
    text-align: center;
    margin-top: 40px;
}

@media (max-width: 768px) {
    .home-blog-grid {
        grid-template-columns: 1fr;
    }

    .home-blog {
        padding: 60px 0 70px;
    }
}