/* ===== 基础变量与重置 ===== */
:root {
    --color-primary: #f59e0b;
    --color-primary-dark: #d97706;
    --color-primary-light: #fbbf24;
    --color-accent: #06b6d4;
    --color-bg: #0a0e17;
    --color-bg-alt: #111827;
    --color-bg-card: #1a1f2e;
    --color-bg-card-hover: #222840;
    --color-text: #e5e7eb;
    --color-text-dim: #9ca3af;
    --color-text-muted: #6b7280;
    --color-border: #1f2937;
    --color-border-light: #374151;
    --gradient-primary: linear-gradient(135deg, #f59e0b, #fbbf24);
    --gradient-accent: linear-gradient(135deg, #06b6d4, #3b82f6);
    --gradient-hero: linear-gradient(135deg, #0a0e17 0%, #1a1f2e 50%, #0f172a 100%);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-card-hover: 0 8px 40px rgba(245, 158, 11, 0.1);
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 通用组件 ===== */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--color-text-dim);
    max-width: 560px;
    margin: 0 auto;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #1a1a2e;
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(245, 158, 11, 0.45);
}

.btn-outline {
    border: 1.5px solid var(--color-border-light);
    color: var(--color-text);
    background: transparent;
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.btn-block {
    width: 100%;
}

/* ===== 导航栏 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(10, 14, 23, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 18px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.logo-icon {
    font-size: 1.6rem;
    color: var(--color-primary);
}

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: 36px;
}

.nav-link {
    font-size: 0.95rem;
    color: var(--color-text-dim);
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 1px;
    transition: var(--transition);
}

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

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

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

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

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(245, 158, 11, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(245, 158, 11, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 70%);
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
}

.hero-glow-1 {
    width: 600px;
    height: 600px;
    background: var(--color-primary);
    top: -200px;
    right: -200px;
    animation: float 8s ease-in-out infinite;
}

.hero-glow-2 {
    width: 400px;
    height: 400px;
    background: var(--color-accent);
    bottom: -100px;
    left: -100px;
    animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -30px) scale(1.05); }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
}

.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.25);
    border-radius: 50px;
    font-size: 0.9rem;
    color: var(--color-primary-light);
    margin-bottom: 28px;
    animation: fadeInUp 0.6s ease-out;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
    animation: fadeInUp 0.6s ease-out 0.15s both;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--color-text-dim);
    line-height: 1.8;
    margin-bottom: 40px;
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
    animation: fadeInUp 0.6s ease-out 0.45s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 56px;
    animation: fadeInUp 0.6s ease-out 0.6s both;
}

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== 核心功能 ===== */
.features {
    padding: 120px 0;
    background: var(--color-bg-alt);
}

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

.feature-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition);
}

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

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(245, 158, 11, 0.1);
    border-radius: var(--radius);
    margin-bottom: 20px;
    color: var(--color-primary);
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: rgba(245, 158, 11, 0.2);
}

.feature-icon svg {
    width: 32px;
    height: 32px;
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--color-text);
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--color-text-dim);
    line-height: 1.7;
}

/* ===== 工作流程 ===== */
.workflow {
    padding: 120px 0;
}

.workflow-steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    max-width: 1000px;
    margin: 0 auto;
}

.step {
    flex: 1;
    text-align: center;
    padding: 0 16px;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: #1a1a2e;
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 20px;
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.3);
}

.step-content h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.step-content p {
    font-size: 0.9rem;
    color: var(--color-text-dim);
    line-height: 1.6;
}

.step-connector {
    width: 60px;
    height: 2px;
    background: var(--gradient-primary);
    margin-top: 30px;
    flex-shrink: 0;
    opacity: 0.4;
}

/* ===== 平台优势 ===== */
.advantages {
    padding: 120px 0;
    background: var(--color-bg-alt);
}

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

.advantage-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
}

.advantage-item:hover {
    border-color: var(--color-border-light);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
}

.advantage-icon {
    font-size: 2.2rem;
    margin-bottom: 16px;
}

.advantage-item h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.advantage-item p {
    font-size: 0.9rem;
    color: var(--color-text-dim);
    line-height: 1.6;
}

/* ===== 联系我们 ===== */
.contact {
    padding: 120px 0;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.contact-info h2 {
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 800;
    margin-bottom: 16px;
}

.contact-info > p {
    color: var(--color-text-dim);
    font-size: 1.05rem;
    margin-bottom: 36px;
    line-height: 1.7;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-item {
    display: flex;
    gap: 12px;
    align-items: baseline;
}

.contact-label {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    min-width: 40px;
}

.contact-value {
    font-size: 1rem;
    color: var(--color-text);
}

.contact-form {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-input {
    width: 100%;
    padding: 14px 18px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
    outline: none;
}

.form-input::placeholder {
    color: var(--color-text-muted);
}

.form-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    padding: 56px 0 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 48px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--color-border);
}

.footer-brand {
    max-width: 280px;
}

.footer-brand .logo-icon {
    font-size: 1.4rem;
    color: var(--color-primary);
    display: inline-block;
    margin-bottom: 8px;
}

.footer-brand .logo-text {
    font-size: 1.3rem;
    font-weight: 700;
    display: block;
    margin-bottom: 8px;
}

.footer-brand p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    gap: 72px;
}

.footer-col h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--color-text);
}

.footer-col a {
    display: block;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 10px;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding: 24px 0;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.footer-bottom p {
    line-height: 1.6;
}

.beian-link {
    color: var(--color-text-muted);
    transition: var(--transition);
}

.beian-link:hover {
    color: var(--color-primary);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .workflow-steps {
        flex-wrap: wrap;
        gap: 24px;
    }

    .step-connector {
        display: none;
    }

    .step {
        flex: 0 0 calc(50% - 12px);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 260px;
        height: 100vh;
        background: var(--color-bg-card);
        flex-direction: column;
        padding: 80px 32px 32px;
        gap: 24px;
        transition: var(--transition);
        border-left: 1px solid var(--color-border);
    }

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

    .menu-toggle {
        display: flex;
        z-index: 1001;
    }

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

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

    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .hero-stats {
        gap: 32px;
        flex-wrap: wrap;
    }

    .footer-content {
        flex-direction: column;
        gap: 32px;
    }

    .footer-links {
        gap: 40px;
    }

    .step {
        flex: 0 0 100%;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
    }

    .hero-stats {
        gap: 24px;
    }

    .stat-item {
        flex: 0 0 calc(50% - 12px);
    }
}