/* 基础样式 */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #06b6d4;
    --accent: #8b5cf6;
    --background: #0f0f23;
    --surface: #1a1a2e;
    --surface-light: #252542;
    --text: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --border: rgba(255, 255, 255, 0.1);
    --gradient-1: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
    --gradient-2: linear-gradient(135deg, #06b6d4 0%, #6366f1 100%);
    --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

.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, 15, 35, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 20px;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

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

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-size: 15px;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--surface-light);
    border-color: var(--primary);
}

.btn-large {
    padding: 16px 32px;
    font-size: 16px;
}

/* 主视觉区 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 24px 80px;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--primary);
    top: -200px;
    right: -100px;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--secondary);
    bottom: -100px;
    left: -100px;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: var(--accent);
    top: 50%;
    left: 30%;
    opacity: 0.3;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: 100px;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.badge-new {
    background: var(--gradient-2);
    color: white;
    padding: 4px 10px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
}

.hero-title {
    font-size: 64px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
}

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

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

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

.hero-stats {
    display: flex;
    align-items: center;
    gap: 32px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border);
}

/* 聊天预览 */
.hero-visual {
    display: flex;
    justify-content: center;
}

.chat-preview {
    width: 360px;
    background: var(--surface);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--shadow), var(--shadow-glow);
    border: 1px solid var(--border);
}

.chat-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px;
    background: var(--surface-light);
    border-bottom: 1px solid var(--border);
}

.chat-avatar {
    width: 44px;
    height: 44px;
    background: var(--gradient-1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.chat-info {
    flex: 1;
}

.chat-name {
    font-weight: 600;
    font-size: 16px;
}

.chat-status {
    font-size: 13px;
    color: #22c55e;
}

.chat-messages {
    padding: 20px;
    min-height: 280px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.message.received {
    align-items: flex-start;
}

.message.sent {
    align-items: flex-end;
}

.message-bubble {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.5;
}

.message.received .message-bubble {
    background: var(--surface-light);
    border-bottom-left-radius: 4px;
}

.message.sent .message-bubble {
    background: var(--primary);
    border-bottom-right-radius: 4px;
}

.message-time {
    font-size: 11px;
    color: var(--text-muted);
}

.chat-input {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--surface-light);
    border-top: 1px solid var(--border);
}

.input-placeholder {
    flex: 1;
    color: var(--text-muted);
    font-size: 14px;
}

.send-btn {
    width: 36px;
    height: 36px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 功能特色 */
.features {
    padding: 120px 0;
    background: linear-gradient(180deg, var(--background) 0%, var(--surface) 100%);
}

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

.section-tag {
    display: inline-block;
    background: var(--surface-light);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: 100px;
    font-size: 14px;
    color: var(--primary-light);
    margin-bottom: 20px;
}

.section-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

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

.feature-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 32px;
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--surface-light);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-light);
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

/* 下载区域 */
.download {
    padding: 120px 0;
}

.download-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 32px;
    padding: 64px;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 64px;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.download-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: var(--primary);
    border-radius: 50%;
    filter: blur(150px);
    opacity: 0.15;
}

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

.download-content h2 {
    font-size: 40px;
    font-weight: 700;
    margin: 16px 0;
}

.download-content > p {
    color: var(--text-secondary);
    font-size: 18px;
    margin-bottom: 32px;
}

.download-options {
    margin-bottom: 40px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--gradient-1);
    padding: 20px 28px;
    border-radius: 16px;
    text-decoration: none;
    color: white;
    transition: all 0.3s;
}

.download-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}

.download-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.download-info {
    display: flex;
    flex-direction: column;
}

.download-label {
    font-weight: 600;
    font-size: 16px;
}

.download-version {
    font-size: 13px;
    opacity: 0.8;
}

.system-requirements {
    background: var(--surface-light);
    border-radius: 16px;
    padding: 24px;
}

.system-requirements h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.system-requirements ul {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.system-requirements li {
    font-size: 14px;
    color: var(--text-secondary);
    padding-left: 20px;
    position: relative;
}

.system-requirements li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary);
    font-weight: 600;
}

.download-note {
    margin-top: 20px;
    padding: 16px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 12px;
}

.download-note p {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 0;
}

.coming-soon-section {
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.coming-soon-section h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.coming-soon-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.coming-soon-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--surface-light);
    border: 1px solid var(--border);
    border-radius: 12px;
    opacity: 0.7;
    transition: all 0.3s;
}

.coming-soon-item:hover {
    opacity: 1;
    border-color: var(--primary);
}

.platform-icon {
    font-size: 20px;
}

.platform-name {
    flex: 1;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
}

.platform-status {
    font-size: 12px;
    color: var(--text-muted);
    background: var(--surface);
    padding: 4px 10px;
    border-radius: 100px;
    border: 1px solid var(--border);
}

@media (max-width: 768px) {
    .coming-soon-list {
        grid-template-columns: 1fr;
    }
}

.download-visual {
    position: relative;
    z-index: 1;
}

.app-icon-large {
    width: 200px;
    height: 200px;
    background: var(--gradient-1);
    border-radius: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 80px;
    font-weight: 700;
    box-shadow: var(--shadow-glow);
}

/* 关于我们 */
.about {
    padding: 120px 0;
    background: var(--surface);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-text h2 {
    font-size: 40px;
    font-weight: 700;
    margin: 16px 0 24px;
}

.about-text > p {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
}

.about-links {
    display: flex;
    justify-content: center;
    gap: 24px;
}

.link-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--surface-light);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
}

.link-item:hover {
    border-color: var(--primary);
    background: var(--primary);
}

/* 页脚 */
.footer {
    padding: 80px 0 40px;
    background: var(--background);
    border-top: 1px solid var(--border);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 80px;
    margin-bottom: 60px;
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: 16px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text);
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: 12px;
}

.footer-column a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

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

.footer-bottom {
    padding-top: 40px;
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 14px;
}

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

    .hero-title {
        font-size: 48px;
    }

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

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

    .hero-visual {
        display: none;
    }

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

    .download-card {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .download-visual {
        display: none;
    }

    .system-requirements ul {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero {
        padding: 100px 20px 60px;
    }

    .hero-title {
        font-size: 36px;
    }

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

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .stat-divider {
        display: none;
    }

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

    .section-title {
        font-size: 32px;
    }

    .download-card {
        padding: 40px 24px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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