/* ========================================
   AIVisual - 专业图片视频编辑软件官网样式
   ======================================== */

/* 基础变量 */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #06b6d4;
    --accent: #f59e0b;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --gray: #64748b;
    --gray-light: #94a3b8;
    --light: #f8fafc;
    --white: #ffffff;
    --gradient-1: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
    --gradient-2: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--dark);
    color: var(--light);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

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

/* ========================================
   导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
    will-change: transform;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.5rem;
}

.logo-icon {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text {
    color: var(--white);
}

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

.nav-links a {
    color: var(--gray-light);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--white);
}

.nav-cta {
    background: var(--gradient-1);
    color: var(--white) !important;
    padding: 10px 24px;
    border-radius: 50px;
    font-weight: 600 !important;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -5px rgba(99, 102, 241, 0.4);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--white);
    transition: all 0.3s ease;
}

/* ========================================
   英雄区域
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    padding: 120px 24px 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.3), transparent),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(6, 182, 212, 0.2), transparent),
        radial-gradient(ellipse 50% 30% at 20% 60%, rgba(139, 92, 246, 0.2), transparent);
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--white);
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--gray-light);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-icon {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: var(--gradient-1);
    color: var(--white);
    box-shadow: 0 10px 30px -5px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 40px -5px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-download {
    background: var(--gradient-2);
    color: var(--white);
    padding: 18px 48px;
    font-size: 1.1rem;
    box-shadow: 0 10px 30px -5px rgba(6, 182, 212, 0.4);
}

.btn-download:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 40px -5px rgba(6, 182, 212, 0.5);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--gray-light);
    font-size: 0.9rem;
}

.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator {
    width: 24px;
    height: 40px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    position: relative;
}

.scroll-indicator::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--primary-light);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0.5; transform: translateX(-50%) translateY(8px); }
}

/* ========================================
   核心卖点
   ======================================== */
.highlights {
    padding: 100px 0;
    background: var(--dark-light);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.highlight-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    transition: all 0.3s ease;
}

.highlight-card:hover {
    transform: translateY(-5px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: var(--shadow-xl);
}

.highlight-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    background: var(--gradient-1);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
}

.highlight-icon svg {
    width: 32px;
    height: 32px;
    color: var(--white);
}

.highlight-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--white);
}

.highlight-card p {
    color: var(--gray-light);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ========================================
   功能特性
   ======================================== */
.features {
    padding: 120px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-tag {
    display: inline-block;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-light);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 16px;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

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

.features-grid {
    display: flex;
    flex-direction: column;
    gap: 100px;
}

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

.feature-card.reverse {
    direction: rtl;
}

.feature-card.reverse > * {
    direction: ltr;
}

.feature-image {
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.feature-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-placeholder,
.batch-placeholder {
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.video-icon,
.batch-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-icon svg {
    width: 32px;
    height: 32px;
    color: var(--white);
    margin-left: 4px;
}

.batch-icon svg {
    width: 32px;
    height: 32px;
    color: var(--white);
}

.video-placeholder span,
.batch-placeholder span {
    color: var(--gray-light);
    font-size: 1.1rem;
}

.batch-stats {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 8px;
}

.batch-stat {
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary-light);
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
}

.batch-stat-sep {
    color: var(--gray);
    font-weight: 500;
}

.feature-content {
    padding: 20px 0;
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    color: var(--primary-light);
}

.feature-content h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.feature-content > p {
    color: var(--gray-light);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 24px;
}

.feature-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.feature-list li {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-light);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

/* ========================================
   效果展示
   ======================================== */
.showcase {
    padding: 120px 0;
    background: var(--dark-light);
}

.showcase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.showcase-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.3s ease;
}

.showcase-item:hover {
    transform: translateY(-5px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: var(--shadow-xl);
}

.showcase-images {
    aspect-ratio: 4/3;
    overflow: hidden;
}

.showcase-images img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.showcase-item:hover .showcase-images img {
    transform: scale(1.05);
}

.showcase-label {
    padding: 16px 20px;
    font-weight: 600;
    color: var(--white);
    background: rgba(0, 0, 0, 0.3);
}

/* 轮播样式 */
.carousel {
    position: relative;
    overflow: hidden;
}

.carousel-track {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.carousel-slide.active {
    opacity: 1;
    position: relative;
}

.carousel-dots {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 10;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: all 0.3s ease;
}

.dot.active {
    background: var(--white);
    transform: scale(1.2);
}

.dot:hover {
    background: rgba(255, 255, 255, 0.8);
}

/* 图片放大模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
    animation: zoomIn 0.3s ease;
}

.modal-content img {
    max-width: 100%;
    max-height: 85vh;
    border-radius: 8px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    color: var(--white);
    font-size: 36px;
    font-weight: 300;
    cursor: pointer;
    transition: color 0.3s ease;
    line-height: 1;
}

.modal-close:hover {
    color: var(--primary-light);
}

.zoomable-image {
    cursor: zoom-in;
    transition: transform 0.3s ease;
}

.zoomable-image:hover {
    transform: scale(1.02);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes zoomIn {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

/* ========================================
   使用教程
   ======================================== */
.tutorial {
    padding: 120px 0;
}

.tutorial-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.tab-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--gray-light);
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

.tab-btn.active {
    background: var(--gradient-1);
    border-color: transparent;
    color: var(--white);
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.step-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: all 0.3s ease;
}

.step-card:hover {
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-3px);
}

.step-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.step-card h4 {
    color: var(--white);
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.step-card p {
    color: var(--gray-light);
    font-size: 0.9rem;
    line-height: 1.6;
}

.feature-tutorials {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.ft-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 28px;
}

.ft-card h5 {
    color: var(--white);
    font-size: 1.1rem;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.ft-card ol {
    padding-left: 20px;
    margin-bottom: 16px;
}

.ft-card li {
    color: var(--gray-light);
    font-size: 0.9rem;
    margin-bottom: 8px;
    line-height: 1.6;
}

.ft-card .tip {
    background: rgba(245, 158, 11, 0.1);
    border-left: 3px solid var(--accent);
    padding: 12px 16px;
    color: var(--accent);
    font-size: 0.85rem;
    border-radius: 0 var(--radius) var(--radius) 0;
}

.video-tips, .batch-tips {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.video-tips h4, .batch-tips h4 {
    color: var(--white);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.video-tips ul {
    padding-left: 20px;
}

.video-tips li {
    color: var(--gray-light);
    margin-bottom: 12px;
    line-height: 1.6;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.tip-item {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.05);
    padding: 16px;
    border-radius: var(--radius);
}

.tip-icon {
    font-size: 1.5rem;
}

.tip-item span:last-child {
    color: var(--gray-light);
    font-size: 0.9rem;
}

.highlight-tip {
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    padding: 16px 20px;
    border-radius: var(--radius);
    color: var(--primary-light);
    font-size: 0.95rem;
}

/* 快捷键 */
.shortcuts {
    margin-top: 60px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.shortcuts h4 {
    color: var(--white);
    text-align: center;
    margin-bottom: 24px;
    font-size: 1.2rem;
}

.shortcuts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
}

.shortcut-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

kbd {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    padding: 6px 12px;
    font-family: inherit;
    font-size: 0.85rem;
    color: var(--white);
    font-weight: 600;
    white-space: nowrap;
}

.shortcut-item span {
    color: var(--gray-light);
    font-size: 0.9rem;
}

/* ========================================
   系统要求
   ======================================== */
.requirements {
    padding: 120px 0;
    background: var(--dark-light);
}

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    max-width: 800px;
    margin: 0 auto;
}

.req-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.req-card.recommended {
    border-color: rgba(99, 102, 241, 0.3);
    background: rgba(99, 102, 241, 0.05);
}

.req-card h4 {
    color: var(--white);
    font-size: 1.25rem;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.req-card.recommended h4::after {
    content: '推荐';
    background: var(--gradient-1);
    color: var(--white);
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: 50px;
    font-weight: 600;
}

.req-card ul {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.req-card li {
    display: flex;
    justify-content: space-between;
    color: var(--gray-light);
    font-size: 0.95rem;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.req-card li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.req-card li span {
    color: var(--white);
    font-weight: 500;
}

/* ========================================
   下载区域
   ======================================== */
.download {
    padding: 120px 0;
    position: relative;
    overflow: hidden;
}

.download::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-1);
    opacity: 0.1;
}

.download-content {
    position: relative;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.download-content h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    color: var(--white);
    margin-bottom: 16px;
}

.download-content > p {
    color: var(--gray-light);
    font-size: 1.1rem;
    margin-bottom: 32px;
}

.download-note {
    color: var(--gray);
    font-size: 0.9rem;
    margin-top: 20px;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--dark-light);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-links {
    display: contents;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand p {
    color: var(--gray-light);
    font-size: 0.95rem;
    line-height: 1.7;
}

.footer-col h5 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: 20px;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-col a {
    color: var(--gray-light);
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer-col a:hover {
    color: var(--primary-light);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    text-align: center;
}

.footer-bottom p {
    color: var(--gray);
    font-size: 0.9rem;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .feature-card {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .feature-card.reverse {
        direction: ltr;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-stats {
        gap: 30px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .features-grid {
        gap: 60px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .shortcuts-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .shortcuts-grid {
        grid-template-columns: 1fr;
    }
}