/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4a90e2;
    --primary-dark: #357abd;
    --secondary-color: #50c878;
    --accent-color: #ff6b6b;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --background-light: #f8f9fa;
    --background-white: #ffffff;
    --border-color: #e9ecef;
    --shadow-light: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 20px rgba(0,0,0,0.15);
    --shadow-heavy: 0 8px 30px rgba(0,0,0,0.2);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-light);
    scroll-behavior: smooth;
}

/* 动画效果 */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition);
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes slideInFromLeft {
    0% { transform: translateX(-100%); opacity: 0; }
    100% { transform: translateX(0); opacity: 1; }
}

@keyframes slideInFromRight {
    0% { transform: translateX(100%); opacity: 0; }
    100% { transform: translateX(0); opacity: 1; }
}

@keyframes fadeInUp {
    0% { transform: translateY(30px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px 0;
    position: relative;
}

/* 导航栏 */
.navbar {
    background: var(--background-white);
    padding: 1rem 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.navbar.scrolled {
    padding: 0.5rem 0;
    box-shadow: var(--shadow-medium);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo:hover {
    color: var(--primary-dark);
    transform: scale(1.05);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
}

.nav-link:hover {
    color: var(--primary-color);
    background: rgba(74, 144, 226, 0.1);
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: var(--transition);
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 80%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-toggle:hover {
    background: rgba(74, 144, 226, 0.1);
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition);
    border-radius: 2px;
}

header {
    background-color: var(--background-white);
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
}

.hamburger-bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px 0;
    background-color: var(--primary-color);
    transition: var(--transition);
}

nav {
    transition: var(--transition);
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
}

nav ul li {
    margin-left: 25px;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 5px 0;
}

nav ul li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--primary-color);
    transition: var(--transition);
}

nav ul li a:hover::after,
nav ul li a.active::after {
    width: 100%;
}

nav ul li a:hover,
nav ul li a.active {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--background-white);
    padding: 140px 0 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="%23ffffff" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
    opacity: 0.4;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -80px;
    left: -80px;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    z-index: 0;
}

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

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
    text-shadow: 0 4px 8px rgba(0,0,0,0.3);
    animation: fadeInUp 1s ease-out;
}

.hero p {
    font-size: 1.4rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-highlights {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 2rem 0;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
    opacity: 0.9;
}

.highlight-item::before {
    content: '✓';
    color: var(--secondary-color);
    font-weight: bold;
    font-size: 1.2rem;
}

.cta-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 3rem;
    animation: fadeInUp 1s ease-out 0.6s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 4rem;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease-out 0.8s both;
}

.stat-item {
    text-align: center;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    min-width: 120px;
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.15);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    display: block;
    color: var(--background-white);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 1px;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border: none;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    line-height: 1.5;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    min-width: 160px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.6s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--background-white);
    box-shadow: var(--shadow-light);
    border: 2px solid transparent;
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-medium);
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
}

.btn-secondary {
    background: transparent;
    color: var(--background-white);
    border: 2px solid var(--background-white);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: var(--background-white);
    color: var(--primary-color);
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-light);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    position: relative;
}

.btn-outline::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: var(--primary-color);
    transition: width 0.3s ease;
    z-index: -1;
}

.btn-outline:hover {
    color: var(--background-white);
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-light);
}

.btn-outline:hover::after {
    width: 100%;
}

.btn-success {
    background: linear-gradient(135deg, var(--secondary-color), #45b049);
    color: var(--background-white);
    box-shadow: var(--shadow-light);
}

.btn-success:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-medium);
}

.btn-large {
    padding: 18px 40px;
    font-size: 1.1rem;
    min-width: 200px;
}

.btn-small {
    padding: 10px 24px;
    font-size: 0.9rem;
    min-width: 120px;
}

.cta-button {
    background-color: var(--white);
    color: var(--primary-color);
    padding: 16px 36px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: bold;
    font-size: 1.1em;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background-color: rgba(0, 123, 255, 0.1);
    transition: var(--transition);
    z-index: -1;
}

.cta-button:hover::before {
    width: 100%;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.cta-button:active {
    transform: scale(0.98);
}

.hero .cta-button,
.hero .qq-group-button {
    background-color: var(--secondary-color);
    color: var(--background-white);
    padding: 15px 35px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: bold;
    font-size: 1.1em;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    margin: 8px;
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
    border: 2px solid var(--secondary-color);
}

.hero .cta-button:hover,
.hero .qq-group-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.hero .qq-group-button:hover {
    background-color: #45b049;
    border-color: #45b049;
    color: var(--background-white);
}

.hero .app-showcase-img {
    margin-top: 40px;
    max-width: 80%;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.section {
    padding: 80px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.section-title {
    font-size: 2.2em;
    margin-bottom: 15px;
    color: var(--text-color);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
}

.section-subtitle {
    font-size: 1.1em;
    color: var(--text-light);
    margin-bottom: 50px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    text-align: left;
}

.feature-item {
    background-color: var(--white);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.feature-item .feature-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 15px;
}

.feature-item .icon {
    font-size: 2.5em;
    margin-right: 15px;
    color: var(--primary-color);
    flex-shrink: 0;
}

.feature-item h3 {
    font-size: 1.4em;
    margin: 0;
    color: var(--text-color);
}

.feature-item p {
    font-size: 0.95em;
    color: var(--text-light);
    margin: 0;
}

.app-screenshots {
    background-color: var(--white);
}

.screenshots-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    justify-content: center;
    align-items: center;
    gap: 25px;
    padding: 10px;
}

.screenshots-gallery img {
    height: auto;
    width: 100%;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    max-width: 250px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin: 0 auto;
    object-fit: cover;
    aspect-ratio: 9/16;
    filter: brightness(0.97);
    will-change: transform;
}

.screenshots-gallery img:hover {
    box-shadow: var(--shadow-lg);
    transform: scale(1.05) translateY(-5px);
    filter: brightness(1.03);
    z-index: 2;
}

.testimonials {
    background-color: var(--bg-color);
}

.testimonial-card {
    background-color: var(--white);
    margin-left: auto;
    margin-right: auto;
    border-left: 5px solid var(--primary-color);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 20px;
    max-width: 600px;
    transition: var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.testimonial-card p.quote {
    font-style: italic;
    font-size: 1.05em;
    line-height: 1.7;
    color: var(--text-light);
    margin-bottom: 15px;
}

.testimonial-card p.author {
    font-weight: bold;
    text-align: right;
    font-size: 0.95em;
    color: var(--primary-color);
}

/* 会员权益表格样式 */
.pricing-table {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
    perspective: 1000px;
}

.pricing-plan {
    background-color: var(--white);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    text-align: left;
    transition: var(--transition);
    transform-style: preserve-3d;
    position: relative;
    z-index: 1;
}

.pricing-plan:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-md);
}

.pricing-plan h3 {
    font-size: 1.6em;
    color: var(--primary-color);
    margin-bottom: 15px;
    text-align: center;
}

.pricing-plan .price {
    font-size: 1.2em;
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 20px;
    text-align: center;
}

.pricing-plan ul {
    list-style: none;
    padding: 0;
    margin-bottom: 25px;
}

.pricing-plan ul li {
    margin-bottom: 10px;
    color: var(--text-light);
    display: flex;
    align-items: center;
}

.pricing-plan ul li::before {
    content: '✔️';
    color: var(--secondary-color);
    margin-right: 10px;
    font-size: 1.2em;
}

.pricing-plan ul li.no-feature::before {
    content: '❌';
    color: #dc3545;
}

.pricing-plan .plan-cta-button {
    display: block;
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: var(--transition);
}

.pricing-plan .plan-cta-button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-sm);
}

.pricing-plan.featured {
    border: 2px solid var(--primary-color);
    transform: scale(1.03);
    box-shadow: 0 8px 30px rgba(0, 123, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.pricing-plan.featured::before {
    content: "推荐";
    position: absolute;
    top: 18px;
    right: -32px;
    background-color: #ffc107;
    color: #333;
    padding: 5px 35px;
    font-size: 0.8em;
    font-weight: bold;
    transform: rotate(45deg);
    transform-origin: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    z-index: 1;
    line-height: 1.5;
}

.cta-section {
    background: linear-gradient(135deg, var(--primary-color), #00C6FF);
    color: white;
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -10%;
    right: -10%;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
}

.cta-section::after {
    content: '';
    position: absolute;
    bottom: -15%;
    left: -5%;
    width: 250px;
    height: 250px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
}

.cta-section .cta-button {
    background-color: var(--white);
    color: var(--primary-color);
}

.cta-section .cta-button:hover {
    background-color: #f0f0f0;
}

/* 我们的初心 Section Styling */
.our-story-section {
    background-color: #e9ecef;
    padding: 70px 0;
    position: relative;
}

.our-story-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(circle at 10% 20%, rgba(0, 123, 255, 0.03) 0%, transparent 80%);
    pointer-events: none;
}

.our-story-section .section-title {
    color: var(--primary-dark);
    margin-bottom: 30px;
}

.story-content-wrapper {
    max-width: 850px;
    margin: 0 auto;
    background-color: var(--white);
    padding: 40px 50px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    text-align: left;
    position: relative;
    z-index: 1;
}

.story-content-wrapper p {
    font-size: 1.1em;
    line-height: 1.85;
    color: #454545;
    margin-bottom: 22px;
    text-align: justify;
}

.story-content-wrapper p:last-child {
    margin-bottom: 0;
}

.app-name-highlight {
    color: var(--primary-color);
    font-weight: bold;
    position: relative;
    display: inline-block;
}

.app-name-highlight::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
    transform: scaleX(0);
    transition: transform 0.3s ease;
    transform-origin: right;
}

.app-name-highlight:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.highlight-feature {
    color: var(--secondary-color);
}

.story-content-wrapper strong,
.story-content-wrapper .app-name-highlight {
    color: var(--primary-color);
    font-weight: 600;
}

.story-content-wrapper .highlight-feature {
    font-weight: 500;
    color: var(--secondary-color);
}

.story-content-wrapper ul {
    list-style: none;
    padding-left: 0;
    margin: 25px 0;
}

.story-content-wrapper ul li {
    font-size: 1.05em;
    color: var(--text-color);
    margin-bottom: 15px;
    padding-left: 30px;
    position: relative;
    line-height: 1.7;
}

.story-content-wrapper ul li::before {
    content: '🌟';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2em;
    color: #ffc107;
}

.story-content-wrapper .final-cta {
    font-weight: bold;
    text-align: center;
    margin-top: 30px;
    font-size: 1.15em;
    color: var(--primary-dark);
}

footer {
    background-color: #343a40;
    color: #adb5bd;
    padding: 40px 0;
    text-align: center;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
}

footer .container {
    font-size: 0.9em;
}

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

footer a:hover {
    text-decoration: underline;
}

footer .footer-links {
    margin-bottom: 10px;
}

footer .footer-links a {
    margin: 0 10px;
    color: #ced4da;
    transition: var(--transition);
    position: relative;
    padding: 3px 0;
}

footer .footer-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: 0;
    left: 0;
    background-color: #fff;
    transition: var(--transition);
}

footer .footer-links a:hover::after {
    width: 100%;
}

footer .footer-links a:hover {
    color: rgba(255, 255, 255, 0.8);
}

/* FAQ样式 */
.faq {
    padding: 80px 0;
    background: var(--background-white);
}

.faq h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: var(--text-primary);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    box-shadow: var(--shadow-light);
}

.faq-question {
    padding: 1.5rem;
    background: var(--background-light);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--text-primary);
    transition: var(--transition);
}

.faq-question:hover {
    background: rgba(74, 144, 226, 0.1);
}

.faq-toggle {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    background: var(--background-white);
    color: var(--text-secondary);
    line-height: 1.6;
}

.faq-item.active .faq-answer {
    padding: 1.5rem;
    max-height: 200px;
}

.faq-item.active .faq-question {
    background: var(--primary-color);
    color: var(--background-white);
}

.faq-item.active .faq-toggle {
    color: var(--background-white);
}

/* 功能对比样式 */
.comparison-section {
    padding: 80px 0;
    background: var(--background-light);
}

.comparison-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 1200px;
    margin: 0 auto;
    align-items: start;
}

.app-card {
    background: var(--background-white);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    height: 100%;
}

.app-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.highlight-card {
    border: 3px solid var(--primary-color);
    position: relative;
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.05), rgba(80, 200, 120, 0.05));
}

.highlight-card::before {
    content: '';
    position: absolute;
    top: -3px;
    left: -3px;
    right: -3px;
    bottom: -3px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--border-radius);
    z-index: -1;
}

.app-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.app-header h3 {
    font-size: 1.8rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.recommended-badge {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--background-white);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.common-badge {
    background: var(--text-secondary);
    color: var(--background-white);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.features-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    border-radius: 8px;
    transition: var(--transition);
}

.highlight-card .feature-item {
    background: rgba(74, 144, 226, 0.05);
}

.highlight-card .feature-item:hover {
    background: rgba(74, 144, 226, 0.1);
}

.app-card:not(.highlight-card) .feature-item {
    background: var(--background-light);
}

.app-card:not(.highlight-card) .feature-item:hover {
    background: rgba(127, 140, 141, 0.1);
}

.feature-icon {
    font-size: 1.5rem;
    font-weight: bold;
    min-width: 30px;
    text-align: center;
}

.feature-icon.cross {
    color: var(--accent-color);
}

.feature-icon.warning {
    color: #f39c12;
}

.feature-content {
    flex: 1;
}

.feature-content strong {
    display: block;
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.feature-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.4;
    margin: 0;
}

/* 旧的表格样式保留以防其他地方使用 */
.comparison-table {
    max-width: 1000px;
    margin: 0 auto;
    background: var(--background-white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
    padding: 1rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
    background: var(--primary-color);
    color: var(--background-white);
    font-weight: 600;
}

.comparison-table tr:nth-child(even) {
    background: var(--background-light);
}

.comparison-table .check {
    color: var(--secondary-color);
    font-size: 1.2rem;
    font-weight: bold;
}

.comparison-table .cross {
    color: var(--accent-color);
    font-size: 1.2rem;
    font-weight: bold;
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: var(--background-white);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
    box-shadow: var(--shadow-medium);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
}

/* 移动端适配 */
@media (max-width: 992px) {
    .section {
        padding: 60px 0;
    }
    
    .features-grid,
    .pricing-table {
        gap: 20px;
    }
    
    .screenshots-gallery {
        gap: 15px;
    }
}

@media (max-width: 768px) {
    .container {
        width: 95%;
        padding: 0 10px;
    }

    .logo {
        font-size: 1.3em;
        max-width: 60%;
    }

    .hero {
        padding: 120px 0 80px;
        min-height: 90vh;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1.2rem;
        padding: 0 15px;
    }
    
    .hero-highlights {
        flex-direction: column;
        gap: 1rem;
    }

    .hero-stats {
        gap: 1.5rem;
    }

    .stat-item {
        min-width: 100px;
    }

    .stat-number {
        font-size: 2rem;
    }
    
    .hero .cta-button,
    .hero .qq-group-button {
        padding: 12px 25px;
        font-size: 1em;
        display: block;
        margin: 10px auto;
        max-width: 80%;
        border: 2px solid var(--secondary-color);
        background-color: var(--secondary-color);
        color: var(--background-white);
    }

    .hero .qq-group-button:hover {
        background-color: #45b049;
        border-color: #45b049;
        color: var(--background-white);
    }

    .section {
        padding: 50px 0;
    }
    
    .section-title {
        font-size: 1.8em;
    }
    
    .section-subtitle {
        font-size: 1em;
        margin-bottom: 30px;
    }

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

    .pricing-table {
        grid-template-columns: 1fr;
    }

    .screenshots-gallery {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
    
    .screenshots-gallery img {
        max-width: 100%;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--background-white);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: 2rem;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-medium);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: 1rem 0;
    }

    .nav-link {
        font-size: 1.2rem;
        color: var(--text-primary);
    }
    
    header nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background-color: var(--white);
        box-shadow: var(--shadow-lg);
        padding: 80px 20px 20px;
        transition: right 0.3s ease;
        z-index: 1000;
    }
    
    header.nav-active nav {
        right: 0;
    }
    
    header.nav-active .hamburger-bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    header.nav-active .hamburger-bar:nth-child(2) {
        opacity: 0;
    }
    
    header.nav-active .hamburger-bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    nav ul {
        flex-direction: column;
        align-items: flex-start;
    }
    
    nav ul li {
        margin: 15px 0;
        width: 100%;
    }
    
    nav ul li a {
        display: block;
        padding: 10px 0;
        font-size: 1.1em;
    }

    .nav-toggle span {
        transition: 0.3s;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

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

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .comparison-container {
         grid-template-columns: 1fr;
         gap: 2rem;
     }

     .app-card {
         padding: 1.5rem;
     }

     .app-header h3 {
         font-size: 1.5rem;
     }

     .feature-item {
         padding: 0.8rem;
     }

     .feature-item .feature-header {
         display: flex;
         align-items: center;
         margin-bottom: 10px;
     }

     .feature-item .icon {
         font-size: 2rem;
         margin-right: 10px;
         flex-shrink: 0;
     }

     .feature-item h3 {
         font-size: 1.2rem;
         margin: 0;
     }

     .feature-item p {
         margin: 0;
         font-size: 0.9rem;
     }

     .feature-icon {
         font-size: 1.3rem;
         min-width: 25px;
     }

     .feature-content strong {
         font-size: 1rem;
     }

     .feature-content p {
         font-size: 0.85rem;
     }

     .comparison-table {
         overflow-x: auto;
     }

    .faq-question {
        padding: 1rem;
        font-size: 0.9rem;
    }

    .faq-answer {
        padding: 0 1rem;
    }

    .faq-item.active .faq-answer {
        padding: 1rem;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 1.3rem;
    }
    
    .story-content-wrapper {
        padding: 30px 20px;
    }
}

@media (max-width: 480px) {
    .container {
        width: 95%;
    }
    
    .logo {
        font-size: 1.2em;
        max-width: 50%;
    }
    
    .hero h1 {
        font-size: 1.8em;
    }
    
    .section-title {
        font-size: 1.6em;
    }
    
    .feature-item,
    .pricing-plan {
        padding: 20px;
    }
    
    .screenshots-gallery {
        grid-template-columns: 1fr 1fr;
    }
    
    .story-content-wrapper p {
        font-size: 1em;
        line-height: 1.7;
    }
    
    .story-content-wrapper ul li {
        font-size: 1em;
    }
}