/* ========================================
   链客云 - 智能助贷CRM系统 官网样式
   清爽风格 | Clean & Fresh Design
   ======================================== */

/* === CSS Variables === */
:root {
    --color-primary: #2B7FF5;
    --color-primary-light: #E8F1FE;
    --color-primary-dark: #1A5DC4;
    --color-accent: #10B981;
    --color-accent-light: #D1FAE5;
    --color-text: #1E293B;
    --color-text-secondary: #64748B;
    --color-text-light: #94A3B8;
    --color-bg: #FFFFFF;
    --color-bg-secondary: #F8FAFC;
    --color-bg-tertiary: #F1F5F9;
    --color-border: #E2E8F0;
    --color-white: #FFFFFF;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 4px 10px -6px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 40px -10px rgba(0, 0, 0, 0.1);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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;
}

/* === Header / Navigation === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.header.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
}

.logo-img {
    width: 36px;
    height: 36px;
    object-fit: contain;
    flex-shrink: 0;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-primary), #6366F1);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    flex-shrink: 0;
}

.logo-text {
    letter-spacing: 1px;
}

/* Nav */
.nav-list {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    display: inline-block;
    padding: 8px 18px;
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

/* Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

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

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

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

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

/* === Hero === */
.hero {
    position: relative;
    padding: 140px 0 100px;
    overflow: hidden;
}

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

.hero-content {
    max-width: 560px;
}

.hero-sub {
    display: inline-block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-light);
    padding: 6px 16px;
    border-radius: 20px;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.25;
    color: var(--color-text);
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.hero-title .highlight {
    color: var(--color-primary);
    position: relative;
}

.hero-title .highlight::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 0;
    right: 0;
    height: 8px;
    background: var(--color-primary-light);
    border-radius: 4px;
    z-index: -1;
    opacity: 0.6;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Hero Visual */
.hero-visual {
    display: flex;
    justify-content: center;
}

.hero-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 20px;
    width: 100%;
    max-width: 420px;
    border: 1px solid var(--color-border);
    position: relative;
}

.hero-card::before {
    content: '';
    position: absolute;
    top: -20px;
    right: -20px;
    bottom: -20px;
    left: -20px;
    background: linear-gradient(135deg, var(--color-primary-light), transparent, var(--color-accent-light));
    border-radius: var(--radius-lg);
    z-index: -1;
    opacity: 0.5;
}

.card-header {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
}

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

.dot-red { background: #EF4444; }
.dot-yellow { background: #F59E0B; }
.dot-green { background: #10B981; }

.card-stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
}

.stat-num {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

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

.card-chart {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    height: 120px;
    padding-top: 24px;
}

.card-chart .bar {
    flex: 1;
    background: var(--color-bg-tertiary);
    border-radius: 6px 6px 0 0;
    transition: var(--transition);
}

.card-chart .bar.active {
    background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
}

.hero-bg-shape {
    position: absolute;
    top: -200px;
    right: -100px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-primary-light) 0%, transparent 70%);
    border-radius: 50%;
    z-index: -1;
    opacity: 0.5;
}

/* === Section Common === */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-light);
    padding: 5px 14px;
    border-radius: 20px;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 16px;
    letter-spacing: -0.3px;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* === Features === */
.features {
    background: var(--color-bg-secondary);
}

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

.feature-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: 32px 28px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.35s ease;
}

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

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 52px;
    height: 52px;
    margin-bottom: 20px;
    color: var(--color-primary);
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

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

.feature-desc {
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* === Advantages === */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.advantage-item {
    text-align: center;
    padding: 36px 24px;
    border-radius: var(--radius-md);
    background: var(--color-white);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.advantage-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.advantage-num {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-primary-light);
    margin-bottom: 12px;
    line-height: 1;
}

.advantage-item h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--color-text);
}

.advantage-item p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* === About === */
.about {
    background: var(--color-bg-secondary);
}

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

.about-text .section-tag {
    margin-bottom: 12px;
}

.about-text .section-title {
    font-size: 1.75rem;
    margin-bottom: 24px;
}

.about-text p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-visual {
    display: flex;
    justify-content: center;
}

.about-card {
    background: linear-gradient(135deg, var(--color-primary), #6366F1);
    border-radius: var(--radius-lg);
    padding: 40px 36px;
    display: flex;
    flex-direction: column;
    gap: 28px;
    width: 100%;
    max-width: 340px;
    box-shadow: var(--shadow-xl);
}

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

.about-num {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-white);
    letter-spacing: -1px;
}

.about-label {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.8);
}

/* === Contact === */
.contact-inner {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    background: var(--color-primary-light);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
}

.contact-icon svg {
    width: 22px;
    height: 22px;
}

.contact-item h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--color-text);
}

.contact-item p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* Contact Form */
.contact-form {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 36px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
}

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

.form-input,
.form-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.925rem;
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg-secondary);
    transition: var(--transition);
    outline: none;
}

.form-input:focus,
.form-textarea:focus {
    border-color: var(--color-primary);
    background: var(--color-white);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--color-text-light);
}

.form-textarea {
    resize: vertical;
    margin-bottom: 20px;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 13px 28px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    letter-spacing: 0.3px;
    font-family: var(--font-sans);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), #4F6EF7);
    color: var(--color-white);
    box-shadow: 0 4px 14px rgba(43, 127, 245, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(43, 127, 245, 0.4);
    transform: translateY(-2px);
}

.btn-outline {
    background: var(--color-white);
    color: var(--color-primary);
    border: 1.5px solid var(--color-border);
}

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

.btn-block {
    width: 100%;
}

/* === Footer === */
.footer {
    background: var(--color-text);
    color: var(--color-white);
    padding: 48px 0 32px;
    text-align: center;
}

.footer-top {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding-bottom: 32px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    margin-bottom: 28px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-white);
    transition: var(--transition);
}

.footer-logo:hover {
    opacity: 0.85;
}

.footer-logo-img {
    width: 36px;
    height: 36px;
    object-fit: contain;
    flex-shrink: 0;
}

.footer-slogan {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.925rem;
    line-height: 1.6;
}

.footer-nav {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-nav a {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.55);
    transition: var(--transition);
}

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

.footer-divider {
    color: rgba(255, 255, 255, 0.15);
    font-size: 0.8rem;
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom a {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
    transition: var(--transition);
}

.footer-bottom a:hover {
    color: rgba(255, 255, 255, 0.7);
}

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

    .hero-content {
        max-width: 100%;
        margin: 0 auto;
    }

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

    .hero-visual {
        max-width: 400px;
        margin: 0 auto;
    }

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

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

    .about-inner {
        grid-template-columns: 1fr;
    }

    .about-visual {
        order: -1;
    }

    .contact-inner {
        grid-template-columns: 1fr;
    }

    .footer-top {
        gap: 16px;
    }
}

@media (max-width: 768px) {
    section {
        padding: 72px 0;
    }

    .hero {
        padding: 110px 0 72px;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    /* Mobile Nav */
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-white);
        box-shadow: var(--shadow-xl);
        padding: 100px 32px 32px;
        transition: var(--transition);
        z-index: 1000;
    }

    .nav.open {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        gap: 4px;
    }

    .nav-link {
        display: block;
        padding: 14px 16px;
        font-size: 1rem;
    }

    .menu-toggle {
        display: flex;
    }

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

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

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


}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}