/*
Theme Name: Dachuan Hulian
Theme URI: https://www.dachuan.com
Author: 山西大川互联科技有限公司
Author URI: https://www.dachuan.com
Description: 山西大川互联科技有限公司官方网站主题 - 现代简约商务风格
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: dachuan
Tags: one-column, custom-menu, featured-images, translation-ready, blog
*/

/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    --color-primary: #1a56ff;
    --color-primary-dark: #0d3bbf;
    --color-primary-light: #e8eeff;
    --color-accent: #ff6b35;
    --color-bg: #ffffff;
    --color-bg-warm: #fafaf8;
    --color-bg-card: #f5f5f3;
    --color-text: #1a1a2e;
    --color-text-secondary: #6b7280;
    --color-text-light: #9ca3af;
    --color-border: #e5e7eb;
    --color-dark-bg: #0a1628;
    --color-dark-card: #111d33;
    --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --container-max: 1200px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    font-size: 16px;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul, ol {
    list-style: none;
}

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

/* ========================================
   Header & Navigation
   ======================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transition: var(--transition);
}

.site-header.scrolled {
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--color-text);
}

.site-logo .logo-icon {
    width: 36px;
    height: 36px;
    background: var(--color-primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 800;
    font-size: 1rem;
}

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

.main-nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    position: relative;
    padding: 4px 0;
}

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

.main-nav a:hover {
    color: var(--color-primary);
}

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

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: var(--font-sans);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 4px 16px rgba(26, 86, 255, 0.3);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    box-shadow: 0 6px 24px rgba(26, 86, 255, 0.4);
    transform: translateY(-1px);
}

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

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

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    padding: 10px 16px;
}

.btn-ghost:hover {
    color: var(--color-primary);
}

.btn-large {
    padding: 14px 32px;
    font-size: 1rem;
}

.btn-white {
    background: #fff;
    color: var(--color-primary);
}

.btn-white:hover {
    background: var(--color-primary-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Mobile Menu Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-toggle span {
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    padding: 160px 0 100px;
    background: var(--color-bg);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(26, 86, 255, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -100px;
    left: -100px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(26, 86, 255, 0.04) 0%, transparent 70%);
    pointer-events: none;
}

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

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-badge::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.hero h1 .highlight {
    color: var(--color-primary);
    position: relative;
}

.hero h1 .serif-accent {
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: 700;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 36px;
    max-width: 480px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.hero-stat {
    text-align: left;
}

.hero-stat .stat-number {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.hero-stat .stat-number span {
    color: var(--color-primary);
}

.hero-stat .stat-label {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-top: 2px;
}

/* Hero Right - Floating Cards */
.hero-visual {
    position: relative;
    z-index: 1;
    height: 480px;
}

.hero-card {
    position: absolute;
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 24px;
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.04);
}

.hero-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.hero-card-main {
    top: 20px;
    right: 0;
    width: 320px;
    background: linear-gradient(135deg, var(--color-primary) 0%, #3d72ff 100%);
    color: #fff;
    border: none;
}

.hero-card-main .card-label {
    font-size: 0.8rem;
    opacity: 0.8;
    margin-bottom: 8px;
}

.hero-card-main .card-value {
    font-size: 2.2rem;
    font-weight: 800;
}

.hero-card-main .card-trend {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-top: 8px;
    font-size: 0.85rem;
    background: rgba(255,255,255,0.2);
    padding: 4px 10px;
    border-radius: 50px;
}

.hero-card-stats {
    top: 180px;
    right: 200px;
    width: 200px;
    z-index: 2;
}

.hero-card-stats .mini-chart {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 60px;
    margin-top: 12px;
}

.hero-card-stats .mini-chart .bar {
    flex: 1;
    background: var(--color-primary-light);
    border-radius: 3px;
    transition: var(--transition);
}

.hero-card-stats .mini-chart .bar.active {
    background: var(--color-primary);
}

.hero-card-tech {
    bottom: 40px;
    right: 40px;
    width: 280px;
}

.tech-stack {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.tech-tag {
    padding: 4px 12px;
    background: var(--color-bg-card);
    border-radius: 50px;
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.hero-card-float {
    top: 120px;
    left: 0;
    width: 160px;
    text-align: center;
    z-index: 3;
}

.hero-card-float .float-icon {
    width: 40px;
    height: 40px;
    background: var(--color-primary-light);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 8px;
    font-size: 1.2rem;
}

.hero-card-float .float-value {
    font-size: 1.4rem;
    font-weight: 800;
}

.hero-card-float .float-label {
    font-size: 0.75rem;
    color: var(--color-text-light);
}

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

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

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

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: 50px;
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.02em;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
    line-height: 1.3;
}

.section-header h2 .serif-accent {
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: 700;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ========================================
   Bento Grid - Services
   ======================================== */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: auto auto;
    gap: 20px;
}

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

.bento-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.bento-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

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

.bento-card-large {
    grid-column: span 2;
    grid-row: span 1;
}

.bento-card-tall {
    grid-row: span 2;
}

.bento-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.bento-icon-blue {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.bento-icon-orange {
    background: #fff4ed;
    color: var(--color-accent);
}

.bento-icon-green {
    background: #ecfdf5;
    color: #059669;
}

.bento-icon-purple {
    background: #f3e8ff;
    color: #7c3aed;
}

.bento-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

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

.bento-features {
    margin-top: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.bento-feature-tag {
    padding: 6px 14px;
    background: var(--color-bg-card);
    border-radius: 50px;
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.bento-card-large .bento-feature-tag:hover {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.bento-visual {
    margin-top: 24px;
    display: flex;
    gap: 12px;
}

.bento-mini-stat {
    flex: 1;
    background: var(--color-bg-card);
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
}

.bento-mini-stat .stat-num {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--color-primary);
}

.bento-mini-stat .stat-txt {
    font-size: 0.75rem;
    color: var(--color-text-light);
    margin-top: 2px;
}

/* ========================================
   Features / Why Choose Us
   ======================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
    text-align: center;
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: var(--color-primary-light);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    color: var(--color-primary);
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: var(--color-primary);
    color: #fff;
    transform: scale(1.05);
}

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

.feature-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ========================================
   Process / How We Work
   ======================================== */
.process-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    position: relative;
}

.process-steps::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 12.5%;
    right: 12.5%;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    z-index: 0;
}

.process-step {
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-number {
    width: 56px;
    height: 56px;
    background: var(--color-primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 800;
    margin: 0 auto 20px;
    box-shadow: 0 4px 16px rgba(26, 86, 255, 0.3);
    border: 4px solid #fff;
}

.process-step h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.process-step p {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ========================================
   CTA Banner
   ======================================== */
.cta-banner {
    background: linear-gradient(135deg, var(--color-dark-bg) 0%, #0e2a5e 50%, var(--color-primary-dark) 100%);
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.cta-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(26, 86, 255, 0.3) 0%, transparent 70%);
    pointer-events: none;
}

.cta-banner::after {
    content: '';
    position: absolute;
    bottom: -50%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(61, 114, 255, 0.2) 0%, transparent 70%);
    pointer-events: none;
}

.cta-inner {
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta-inner h2 {
    font-size: 2.4rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.cta-inner h2 .serif-accent {
    font-family: var(--font-serif);
    font-style: italic;
}

.cta-inner p {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: 36px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.cta-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    align-items: center;
}

.cta-contact-info {
    display: flex;
    gap: 40px;
    justify-content: center;
    margin-top: 40px;
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
}

.cta-contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
    background: var(--color-dark-bg);
    color: rgba(255,255,255,0.6);
    padding: 64px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .site-logo {
    color: #fff;
    margin-bottom: 16px;
}

.footer-brand .site-logo .logo-icon {
    background: var(--color-primary);
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
    max-width: 300px;
}

.footer-col h4 {
    color: #fff;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    font-size: 0.88rem;
    color: rgba(255,255,255,0.5);
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: #fff;
    padding-left: 4px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    font-size: 0.82rem;
}

.footer-bottom a {
    color: rgba(255,255,255,0.4);
}

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

/* ========================================
   Scroll Animations
   ======================================== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero-visual {
        height: 360px;
        display: none;
    }

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

    .bento-card-large {
        grid-column: span 2;
    }

    .bento-card-tall {
        grid-row: span 1;
    }

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

    .process-steps {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .process-steps::before {
        display: none;
    }

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

@media (max-width: 768px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px 24px;
        gap: 16px;
        box-shadow: var(--shadow-md);
        border-top: 1px solid var(--color-border);
    }

    .main-nav.active {
        display: flex;
    }

    .mobile-toggle {
        display: flex;
    }

    .header-cta .btn-outline {
        display: none;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-desc {
        font-size: 1rem;
    }

    .hero-stats {
        gap: 24px;
    }

    .hero-stat .stat-number {
        font-size: 1.4rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
    }

    .section {
        padding: 64px 0;
    }

    .section-header h2 {
        font-size: 1.8rem;
    }

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

    .bento-card-large {
        grid-column: span 1;
    }

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

    .process-steps {
        grid-template-columns: 1fr;
    }

    .cta-inner h2 {
        font-size: 1.8rem;
    }

    .cta-actions {
        flex-direction: column;
    }

    .cta-contact-info {
        flex-direction: column;
        gap: 12px;
        align-items: center;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}

/* ========================================
   WordPress Specific
   ======================================== */
.wp-block-image img {
    border-radius: var(--radius-md);
}

.entry-content {
    max-width: 720px;
    margin: 0 auto;
    padding: 40px 24px;
}

.entry-content h1,
.entry-content h2,
.entry-content h3 {
    margin-top: 2em;
    margin-bottom: 0.5em;
}

.entry-content p {
    margin-bottom: 1.5em;
    line-height: 1.8;
}

/* Page template */
.page-header-section {
    padding: 140px 0 60px;
    background: var(--color-bg-warm);
    text-align: center;
}

.page-header-section h1 {
    font-size: 2.4rem;
    font-weight: 800;
}

/* Particles / Background decoration */
.bg-grid-pattern {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(26, 86, 255, 0.05) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
}