/* ===== CSS Variables ===== */
:root {
    --primary: #4f6ef7;
    --primary-light: #6b85f9;
    --primary-dark: #3a54d4;
    --secondary: #1a1a2e;
    --secondary-light: #16213e;
    --accent: #e94560;
    --text: #333;
    --text-light: #666;
    --text-lighter: #999;
    --bg: #fff;
    --bg-light: #f8f9fc;
    --bg-dark: #0a0f1e;
    --border: #e8ecf1;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s ease;
    --font: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ===== Reset ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.7; overflow-x: hidden; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ===== Container ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== Section Common ===== */
section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag { display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 3px; color: var(--primary); background: rgba(79,110,247,0.1); padding: 6px 16px; border-radius: 20px; margin-bottom: 16px; }
.section-title { font-size: 36px; font-weight: 700; color: var(--secondary); margin-bottom: 16px; }
.section-desc { font-size: 16px; color: var(--text-light); max-width: 600px; margin: 0 auto; }

/* ===== Animations ===== */
[data-animate] { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
[data-animate].visible { opacity: 1; transform: translateY(0); }

/* ===== Header ===== */
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; padding: 16px 0; transition: var(--transition); }
.header.scrolled { background: rgba(255,255,255,0.92); backdrop-filter: blur(12px); box-shadow: 0 2px 20px rgba(0,0,0,0.06); padding: 10px 0; }
.header-inner { display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 22px; font-weight: 700; color: var(--secondary); }
.logo-icon { color: var(--primary); font-size: 24px; }
.nav { display: flex; gap: 32px; }
.nav-link { font-size: 15px; color: var(--text-light); font-weight: 500; transition: var(--transition); position: relative; }
.nav-link::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--primary); transition: var(--transition); }
.nav-link:hover, .nav-link.active { color: var(--primary); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }
.header-phone { display: inline-flex; align-items: center; gap: 6px; padding: 8px 20px; background: var(--primary); color: #fff; border-radius: 24px; font-size: 14px; font-weight: 500; transition: var(--transition); }
.header-phone:hover { background: var(--primary-dark); transform: translateY(-1px); }
.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(--secondary); transition: var(--transition); border-radius: 2px; }

/* ===== Hero ===== */
.hero { position: relative; height: 100vh; min-height: 600px; overflow: hidden; }
.hero-slider { width: 100%; height: 100%; }
.hero-slide { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; opacity: 0; transition: opacity 0.8s ease; padding: 0 24px; }
.hero-slide.active { opacity: 1; z-index: 1; }
.hero-content { position: relative; z-index: 3; text-align: center; max-width: 700px; padding: 0 20px; }
.hero-title { font-size: 52px; font-weight: 900; color: #fff; line-height: 1.2; margin-bottom: 24px; }
.hero-title .highlight { background: linear-gradient(135deg, var(--primary-light), #a78bfa); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc { font-size: 18px; color: rgba(255,255,255,0.7); margin-bottom: 36px; line-height: 1.8; }
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* Slides with a dedicated visual use separate layout columns. */
.hero-slide--split { gap: clamp(48px, 7vw, 120px); }
.hero-slide--split .hero-content { flex: 0 1 600px; text-align: left; }
.hero-slide--split .hero-btns { justify-content: flex-start; }
.hero-slide--split .hero-visual { position: relative; inset: auto; flex: 0 0 460px; width: 460px; height: 280px; }

/* Hero Visual */
.hero-visual { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; pointer-events: none; z-index: 1; opacity: 0.6; }
.hero-float-card { position: absolute; background: rgba(255,255,255,0.08); backdrop-filter: blur(8px); border: 1px solid rgba(255,255,255,0.12); border-radius: 16px; padding: 16px 20px; display: flex; align-items: center; gap: 10px; color: #fff; font-size: 14px; animation: float 6s ease-in-out infinite; }
.hero-float-card .float-icon { font-size: 28px; }
.card-1 { top: 25%; left: 8%; animation-delay: 0s; }
.card-2 { top: 20%; right: 10%; animation-delay: 1.5s; }
.card-3 { bottom: 28%; left: 12%; animation-delay: 3s; }
.card-4 { bottom: 22%; right: 8%; animation-delay: 4.5s; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* Hero number display */
.hero-number-display { display: flex; gap: 40px; }
.number-ring { text-align: center; color: #fff; }
.number-ring span { display: block; font-size: 42px; font-weight: 900; background: linear-gradient(135deg, var(--primary-light), #a78bfa); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.number-ring small { display: block; font-size: 14px; color: rgba(255,255,255,0.6); margin-top: 4px; }

/* Hero tech tags */
.tech-tags { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; max-width: 400px; }
.tech-tag { padding: 8px 18px; background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.15); border-radius: 24px; color: rgba(255,255,255,0.8); font-size: 14px; font-weight: 500; backdrop-filter: blur(4px); }

/* Hero dots & scroll hint */
.hero-dots { position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%); display: flex; gap: 10px; z-index: 10; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,0.3); cursor: pointer; transition: var(--transition); }
.dot.active { background: var(--primary); width: 28px; border-radius: 5px; }
.scroll-hint { position: absolute; bottom: 80px; left: 50%; transform: translateX(-50%); text-align: center; color: rgba(255,255,255,0.5); font-size: 12px; z-index: 10; }
.scroll-arrow { width: 20px; height: 20px; border-right: 2px solid rgba(255,255,255,0.4); border-bottom: 2px solid rgba(255,255,255,0.4); transform: rotate(45deg); margin: 8px auto 0; animation: scrollBounce 2s infinite; }
@keyframes scrollBounce { 0%,100% { transform: rotate(45deg) translateY(0); } 50% { transform: rotate(45deg) translateY(6px); } }

/* ===== Buttons ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 32px; border-radius: 8px; font-size: 15px; font-weight: 600; transition: var(--transition); cursor: pointer; border: none; touch-action: manipulation; -webkit-tap-highlight-color: transparent; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(79,110,247,0.35); }
.btn-outline { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,0.4); }
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: #fff; }
.btn-lg { padding: 14px 40px; font-size: 16px; }
.btn-block { width: 100%; }

/* Enhanced focus for accessibility */
.btn:focus-visible, .nav-link:focus-visible, .filter-btn:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ===== Services ===== */
.services { background: var(--bg-light); }
.services-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.service-card { background: #fff; border-radius: var(--radius); padding: 32px 24px; transition: var(--transition); border: 1px solid var(--border); position: relative; overflow: hidden; }
.service-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--primary), var(--primary-light)); transform: scaleX(0); transition: var(--transition); }
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon { width: 56px; height: 56px; margin-bottom: 20px; color: var(--primary); }
.service-icon svg { width: 100%; height: 100%; }
.service-card h3 { font-size: 18px; font-weight: 600; color: var(--secondary); margin-bottom: 10px; }
.service-card p { font-size: 14px; color: var(--text-light); line-height: 1.7; margin-bottom: 16px; }
.service-link { font-size: 14px; color: var(--primary); font-weight: 500; display: inline-flex; align-items: center; gap: 4px; }
.service-link:hover { gap: 8px; }

/* ===== Advantages ===== */
.advantages { background: #fff; }
.advantages-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.advantage-card { background: var(--bg-light); border-radius: var(--radius); padding: 32px 24px; transition: var(--transition); position: relative; border: 1px solid transparent; }
.advantage-card:hover { border-color: var(--primary); box-shadow: var(--shadow); transform: translateY(-4px); }
.advantage-num { position: absolute; top: 16px; right: 20px; font-size: 48px; font-weight: 900; color: rgba(79,110,247,0.08); line-height: 1; }
.advantage-icon { font-size: 36px; margin-bottom: 16px; }
.advantage-card h3 { font-size: 18px; font-weight: 600; color: var(--secondary); margin-bottom: 10px; }
.advantage-card p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* ===== Process ===== */
.process { background: var(--bg-light); }
.process-steps { display: flex; align-items: flex-start; justify-content: center; gap: 0; flex-wrap: wrap; }
.process-step { text-align: center; flex: 0 0 auto; width: 130px; }
.step-num { width: 48px; height: 48px; border-radius: 50%; background: var(--primary); color: #fff; font-size: 20px; font-weight: 700; display: flex; align-items: center; justify-content: center; margin: 0 auto 12px; }
.step-content h4 { font-size: 15px; font-weight: 600; color: var(--secondary); margin-bottom: 4px; }
.step-content p { font-size: 12px; color: var(--text-light); }
.process-line { width: 40px; height: 2px; background: linear-gradient(90deg, var(--primary), var(--primary-light)); margin-top: 24px; flex-shrink: 0; }

/* ===== Cases ===== */
.cases { background: #fff; }
.cases-filter { display: flex; gap: 12px; justify-content: center; margin-bottom: 40px; flex-wrap: wrap; }
.filter-btn { padding: 8px 24px; border: 1px solid var(--border); border-radius: 24px; background: #fff; color: var(--text-light); font-size: 14px; cursor: pointer; transition: var(--transition); }
.filter-btn:hover, .filter-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card { border-radius: var(--radius); overflow: hidden; background: #fff; border: 1px solid var(--border); transition: var(--transition); }
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.case-card.hidden { display: none; }
.case-img { height: 200px; display: flex; align-items: center; justify-content: center; position: relative; }
.case-img-text { color: #fff; font-size: 20px; font-weight: 700; text-shadow: 0 2px 8px rgba(0,0,0,0.2); }
.case-info { padding: 20px; }
.case-tag { display: inline-block; font-size: 12px; color: var(--primary); background: rgba(79,110,247,0.1); padding: 4px 12px; border-radius: 12px; margin-bottom: 10px; }
.case-info h3 { font-size: 16px; font-weight: 600; color: var(--secondary); margin-bottom: 6px; }
.case-info p { font-size: 13px; color: var(--text-lighter); }

/* ===== About ===== */
.about { background: var(--bg-light); }
.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-lead { font-size: 20px; font-weight: 600; color: var(--secondary); line-height: 1.6; margin-bottom: 20px; }
.about-text p { font-size: 15px; color: var(--text-light); margin-bottom: 16px; line-height: 1.8; }
.about-highlights { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 24px; }
.highlight-item { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text); }
.highlight-icon { color: var(--primary); font-size: 12px; }
.about-img-grid { display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: auto auto; gap: 16px; }
.about-img-item { border-radius: var(--radius); overflow: hidden; min-height: 140px; display: flex; align-items: center; justify-content: center; }
.about-img-item.img-large { grid-row: span 2; min-height: 300px; }
.img-placeholder { text-align: center; color: #fff; }
.img-placeholder svg { width: 48px; height: 48px; margin: 0 auto 12px; }
.img-placeholder span { display: block; font-size: 14px; opacity: 0.7; }

/* ===== Tech Stack ===== */
.tech-stack { background: #fff; }
.tech-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.tech-group { background: var(--bg-light); border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); transition: var(--transition); }
.tech-group:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.tech-group h4 { font-size: 15px; font-weight: 600; color: var(--secondary); margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.tech-items { display: flex; flex-wrap: wrap; gap: 8px; }
.tech-item { padding: 4px 12px; background: #fff; border: 1px solid var(--border); border-radius: 6px; font-size: 13px; color: var(--text-light); transition: var(--transition); }
.tech-item:hover { border-color: var(--primary); color: var(--primary); }

/* ===== CTA ===== */
.cta { background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-light) 100%); padding: 80px 0; }
.cta-content { text-align: center; }
.cta-content h2 { font-size: 36px; font-weight: 700; color: #fff; margin-bottom: 16px; line-height: 1.4; }
.cta-content p { font-size: 16px; color: rgba(255,255,255,0.6); margin-bottom: 32px; }
.cta-btns { display: flex; gap: 16px; justify-content: center; }

/* ===== Contact ===== */
.contact { background: var(--bg-light); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info { display: flex; flex-direction: column; gap: 24px; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-icon { font-size: 28px; flex-shrink: 0; }
.contact-item h4 { font-size: 15px; font-weight: 600; color: var(--secondary); margin-bottom: 4px; }
.contact-item p { font-size: 14px; color: var(--text-light); }
.contact-notice { background: #fff; border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); margin-top: 8px; }
.contact-notice h4 { font-size: 15px; font-weight: 600; color: var(--secondary); margin-bottom: 16px; }
.notice-steps { display: flex; gap: 12px; flex-wrap: wrap; }
.notice-step { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text-light); }
.notice-step span { width: 24px; height: 24px; border-radius: 50%; background: var(--primary); color: #fff; font-size: 12px; font-weight: 700; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.contact-form { background: #fff; border-radius: var(--radius); padding: 32px; border: 1px solid var(--border); }
.contact-form h3 { font-size: 20px; font-weight: 600; color: var(--secondary); margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 12px 16px; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 14px; font-family: var(--font); transition: var(--transition); background: #fff; color: var(--text); }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,110,247,0.1); }
.form-group textarea { resize: vertical; }
.form-group select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23999' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px; }

/* ===== Footer ===== */
.footer { background: var(--secondary); color: rgba(255,255,255,0.6); padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo { color: #fff; margin-bottom: 16px; }
.footer-brand p { font-size: 14px; line-height: 1.8; margin-bottom: 16px; }
.footer-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.footer-tags span { padding: 4px 12px; background: rgba(255,255,255,0.08); border-radius: 4px; font-size: 12px; }
.footer-links h4 { color: #fff; font-size: 15px; font-weight: 600; margin-bottom: 16px; }
.footer-links a { display: block; font-size: 14px; color: rgba(255,255,255,0.5); padding: 4px 0; transition: var(--transition); }
.footer-links a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding: 20px 0; text-align: center; font-size: 13px; }
.footer-service-phone { display: inline-block; margin-bottom: 8px; color: rgba(255,255,255,0.72); text-decoration: none; transition: var(--transition); }
.footer-service-phone:hover { color: #fff; }

.contact-dock { position: fixed; top: 50%; right: 24px; z-index: 990; width: 64px; box-sizing: border-box; padding: 4px; border: 1px solid transparent; border-radius: 30px; background: transparent; box-shadow: none; transform: translateY(-50%); transition: width 0.28s cubic-bezier(.2,.8,.2,1), background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease; }
.contact-dock:has(.contact-dock-wechat:hover), .contact-dock:has(.contact-dock-wechat:focus-within) { width: 226px; border-color: rgba(148,163,184,0.18); background: rgba(15,23,42,0.94); box-shadow: 0 10px 30px rgba(2,6,23,0.28); backdrop-filter: blur(14px); }
.contact-dock[hidden], .contact-dock-item[hidden] { display: none; }
.contact-dock-item { position: relative; width: 56px; margin-left: auto; }
.contact-dock-item + .contact-dock-item { margin-top: 10px; }
.contact-dock-button { position: relative; z-index: 2; display: flex; width: 56px; height: 56px; align-items: center; justify-content: center; padding: 0; border: 0; border-radius: 50%; color: #fff; background: var(--primary); box-shadow: 0 6px 18px rgba(79,110,247,0.28); cursor: pointer; transition: background 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease; }
.contact-dock-button:hover, .contact-dock-button:focus-visible { color: #fff; background: var(--primary-dark); box-shadow: 0 8px 22px rgba(79,110,247,0.38); transform: translateY(-1px); outline: none; }
.contact-dock-button svg { width: 32px; height: 32px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.contact-dock-wechat .contact-dock-button svg { width: 32px; height: 32px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.contact-dock-wechat .icon-eye { fill: currentColor; stroke: none; }
.contact-dock-panel { position: absolute; top: 50%; right: 64px; z-index: 1; display: flex; align-items: center; justify-content: center; min-height: 56px; padding: 0 12px; border: 0; border-radius: 0; color: #e5e7eb; background: transparent; box-shadow: none; opacity: 0; visibility: hidden; clip-path: inset(0 0 0 100%); transform: translateY(-50%); transform-origin: right center; transition: opacity 0.18s ease 0.06s, clip-path 0.24s cubic-bezier(.2,.8,.2,1) 0.04s, visibility 0.24s; pointer-events: none; white-space: nowrap; }
.contact-dock-item:hover .contact-dock-panel, .contact-dock-item:focus-within .contact-dock-panel { opacity: 1; visibility: visible; clip-path: inset(0); }
.contact-dock-number { min-width: 176px; font-size: 20px; font-weight: 700; letter-spacing: 0; }
.contact-dock-phone .contact-dock-panel { right: 48px; min-height: 56px; padding: 0 28px 0 20px; border: 0; border-radius: 28px 0 0 28px; color: #fff; background: var(--primary); box-shadow: -8px 8px 22px rgba(79,110,247,0.24); }
.contact-dock-qr { flex-direction: column; gap: 5px; width: 142px; padding: 0; font-size: 12px; }
.contact-dock-wechat .contact-dock-panel { top: 61px; }
.contact-dock-qr strong { font-weight: 500; color: rgba(255,255,255,0.72); }
.contact-dock-qr img { display: block; width: 108px; height: 108px; padding: 4px; border-radius: 6px; background: #fff; object-fit: contain; }

@media (max-width: 768px) {
    .contact-dock { right: 12px; width: 56px; padding: 3px; }
    .contact-dock:has(.contact-dock-wechat:hover), .contact-dock:has(.contact-dock-wechat:focus-within) { width: 210px; }
    .contact-dock-item { width: 50px; }
    .contact-dock-button { width: 50px; height: 50px; }
    .contact-dock-button svg { width: 28px; height: 28px; }
    .contact-dock-wechat .contact-dock-button svg { width: 27px; height: 27px; }
    .contact-dock-panel { right: 57px; }
    .contact-dock-phone .contact-dock-panel { right: 43px; min-height: 50px; }
    .contact-dock-wechat .contact-dock-panel { top: 55px; }
    .contact-dock-number { min-width: 150px; padding: 12px 16px; font-size: 16px; }
    .contact-dock-qr img { width: 102px; height: 102px; }
}

/* ===== Back to Top ===== */
.back-to-top { position: fixed; bottom: 32px; right: 32px; width: 44px; height: 44px; border-radius: 50%; background: var(--primary); color: #fff; border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; opacity: 0; visibility: hidden; transition: var(--transition); box-shadow: 0 4px 12px rgba(79,110,247,0.3); z-index: 999; }
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: translateY(-3px); box-shadow: 0 6px 20px rgba(79,110,247,0.4); }

/* ===== Page Banner ===== */
.page-banner { padding: 140px 0 60px; text-align: center; color: #fff; }
.page-banner-title { font-size: 40px; font-weight: 900; margin-bottom: 12px; }
.page-banner-desc { font-size: 16px; color: rgba(255,255,255,0.6); max-width: 500px; margin: 0 auto; }

/* ===== Service Detail ===== */
.service-detail { padding: 80px 0; }
.service-detail-card { display: flex; gap: 32px; padding: 32px; background: #fff; border-radius: var(--radius); border: 1px solid var(--border); margin-bottom: 24px; transition: var(--transition); }
.service-detail-card:hover { box-shadow: var(--shadow); border-color: var(--primary); }
.service-detail-icon { font-size: 40px; flex-shrink: 0; width: 60px; text-align: center; }
.service-detail-content h2 { font-size: 20px; font-weight: 600; color: var(--secondary); margin-bottom: 10px; }
.service-detail-content p { font-size: 14px; color: var(--text-light); line-height: 1.8; margin-bottom: 16px; }
.service-detail-list { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.service-detail-list li { font-size: 14px; color: var(--text); padding: 6px 0; padding-left: 20px; position: relative; }
.service-detail-list li::before { content: '✓'; position: absolute; left: 0; color: var(--primary); font-weight: 700; }

/* Skip to content link for accessibility */
.skip-link { position: absolute; top: -40px; left: 0; background: var(--primary); color: #fff; padding: 8px; z-index: 10000; transition: top 0.3s; }
.skip-link:focus { top: 0; }

/* Image alt fallback */
img { max-width: 100%; display: block; height: auto; }
img:not([alt]) { outline: 2px dashed #e94560; }

/* Breadcrumb */
.breadcrumb { display: flex; align-items: center; gap: 8px; margin-bottom: 16px; font-size: 14px; color: rgba(255,255,255,0.5); }
.breadcrumb a { color: rgba(255,255,255,0.6); transition: var(--transition); }
.breadcrumb a:hover { color: #fff; }
.breadcrumb span { opacity: 0.5; }

/* Page inner body */
.page-inner { padding-top: 0; }

/* ===== Section More ===== */
.section-more { text-align: center; margin-top: 40px; }
.btn-outline-dark { background: transparent; color: var(--text); border: 1.5px solid var(--border); }
.btn-outline-dark:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 6px 16px; font-size: 13px; }
.btn-danger { background: #e74c3c; color: #fff; border: none; padding: 6px 16px; font-size: 13px; border-radius: 6px; cursor: pointer; }
.btn-danger:hover { background: #c0392b; }

/* ===== Articles Grid ===== */
.articles-section { padding: 80px 0; background: var(--bg-light); }
.articles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.article-card { background: #fff; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); transition: var(--transition); }
.article-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.article-cover { height: 180px; overflow: hidden; }
.article-cover img { width: 100%; height: 100%; object-fit: cover; }
.article-body { padding: 20px; }
.article-category { display: inline-block; font-size: 12px; color: var(--primary); background: rgba(79,110,247,0.1); padding: 4px 12px; border-radius: 12px; margin-bottom: 10px; }
.article-title { font-size: 16px; font-weight: 600; color: var(--secondary); margin-bottom: 8px; line-height: 1.4; }
.article-summary { font-size: 14px; color: var(--text-light); line-height: 1.6; margin-bottom: 12px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.article-meta { display: flex; gap: 16px; font-size: 12px; color: var(--text-lighter); }
.no-data { text-align: center; padding: 60px 0; color: var(--text-lighter); font-size: 15px; }

/* ===== Form Messages ===== */
.form-message { margin-top: 12px; padding: 12px 16px; border-radius: var(--radius-sm); font-size: 14px; }
.form-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.form-error { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }

/* ===== Admin Styles ===== */
.admin-body { background: #f0f2f5; }
.admin-header { background: #fff; border-bottom: 1px solid var(--border); padding: 12px 0; position: sticky; top: 0; z-index: 100; }
.admin-header-inner { display: flex; align-items: center; gap: 16px; }
.admin-badge { background: var(--primary); color: #fff; padding: 4px 12px; border-radius: 4px; font-size: 13px; font-weight: 500; }
.admin-container { display: flex; max-width: 1400px; margin: 24px auto; padding: 0 24px; gap: 24px; }
.admin-sidebar { width: 200px; flex-shrink: 0; }
.admin-nav { background: #fff; border-radius: var(--radius); padding: 12px; border: 1px solid var(--border); position: sticky; top: 80px; }
.admin-nav-link { display: block; padding: 10px 16px; border-radius: var(--radius-sm); font-size: 14px; color: var(--text-light); transition: var(--transition); margin-bottom: 4px; }
.admin-nav-link:hover { background: var(--bg-light); color: var(--primary); }
.admin-nav-link.active { background: rgba(79,110,247,0.1); color: var(--primary); font-weight: 500; }
.admin-main { flex: 1; min-width: 0; }
.admin-panel { display: none; }
.admin-panel.active { display: block; }
.admin-panel-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.admin-panel-header h2 { font-size: 20px; font-weight: 600; color: var(--secondary); }
.admin-count { font-size: 13px; color: var(--primary); background: rgba(79,110,247,0.1); padding: 4px 12px; border-radius: 12px; }
.admin-form { background: #fff; border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); margin-bottom: 20px; }
.admin-form h3 { font-size: 16px; font-weight: 600; color: var(--secondary); margin-bottom: 20px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.admin-form .form-group { margin-bottom: 16px; }
.admin-form label { display: block; font-size: 13px; font-weight: 500; color: var(--text); margin-bottom: 6px; }
.admin-form-actions { display: flex; gap: 12px; margin-top: 20px; }
.admin-table-wrap { background: #fff; border-radius: var(--radius); border: 1px solid var(--border); overflow-x: auto; }
.admin-table { width: 100%; border-collapse: collapse; }
.admin-table th { padding: 12px 16px; text-align: left; font-size: 13px; font-weight: 600; color: var(--text-light); background: var(--bg-light); border-bottom: 1px solid var(--border); }
.admin-table td { padding: 12px 16px; font-size: 14px; color: var(--text); border-bottom: 1px solid var(--border); }
.admin-table tr:last-child td { border-bottom: none; }
.admin-table .btn { margin-right: 6px; }
.row-unread { background: rgba(79,110,247,0.03); }
.status-badge { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 12px; }
.status-badge.unread { background: #fff3cd; color: #856404; }
.status-badge.read { background: #d4edda; color: #155724; }

/* Upload Area */
.upload-area { background: #fff; border: 2px dashed var(--border); border-radius: var(--radius); padding: 60px 20px; text-align: center; cursor: pointer; transition: var(--transition); }
.upload-area:hover, .upload-area.dragover { border-color: var(--primary); background: rgba(79,110,247,0.02); }
.upload-icon { font-size: 48px; margin-bottom: 12px; }
.upload-area p { font-size: 15px; color: var(--text); margin-bottom: 4px; }
.upload-hint { font-size: 13px; color: var(--text-lighter); }
.upload-preview { background: #fff; border-radius: var(--radius); border: 1px solid var(--border); padding: 24px; margin-top: 20px; text-align: center; }
.upload-preview img { max-width: 300px; max-height: 200px; border-radius: var(--radius-sm); margin-bottom: 16px; }
.upload-result { display: flex; align-items: center; gap: 8px; justify-content: center; }
.upload-result label { font-size: 13px; font-weight: 500; color: var(--text); }
.upload-result input { flex: 1; max-width: 400px; padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 13px; background: var(--bg-light); }
.upload-progress { margin-top: 20px; text-align: center; }
.progress-bar { width: 100%; max-width: 400px; height: 8px; background: var(--bg-light); border-radius: 4px; overflow: hidden; margin: 0 auto 8px; }
.progress-fill { height: 100%; background: var(--primary); border-radius: 4px; transition: width 0.3s; width: 0%; }
#progressText { font-size: 13px; color: var(--text-light); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero-slide--split { gap: 32px; }
    .hero-slide--split .hero-content { flex-basis: 520px; }
    .hero-slide--split .hero-visual { flex-basis: 340px; width: 340px; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .advantages-grid { grid-template-columns: repeat(2, 1fr); }
    .tech-grid { grid-template-columns: repeat(3, 1fr); }
    .process-steps { gap: 8px; }
    .process-line { width: 24px; }
    .process-step { width: 100px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    section { padding: 60px 0; }
    .section-title { font-size: 28px; }
    .section-desc { font-size: 14px; }
    .container { padding: 0 16px; }

    /* Header mobile */
    .nav { position: fixed; top: 0; right: -100%; width: 280px; height: 100vh; background: #fff; flex-direction: column; padding: 80px 24px 24px; gap: 0; transition: right 0.3s ease; box-shadow: -4px 0 20px rgba(0,0,0,0.1); z-index: 1001; }
    .nav.open { right: 0; }
    .nav-link { padding: 14px 0; border-bottom: 1px solid var(--border); font-size: 16px; }
    .header-phone { display: none; }
    .menu-toggle { display: flex; }
    .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 mobile - 关键修复：文字不被遮挡 */
    .hero { min-height: 500px; }
    .hero-content { padding: 0 16px; max-width: 100%; }
    .hero-slide--split { gap: 0; }
    .hero-slide--split .hero-content { flex: 0 1 700px; text-align: center; }
    .hero-slide--split .hero-btns { justify-content: center; }
    .hero-slide--split .hero-visual { display: none; }
    .hero-title { font-size: 28px; margin-bottom: 16px; line-height: 1.3; }
    .hero-desc { font-size: 14px; margin-bottom: 24px; line-height: 1.7; }
    .hero-btns { gap: 12px; }
    .hero-btns .btn { padding: 10px 24px; font-size: 14px; }
    .hero-float-card { display: none !important; }
    .hero-visual { opacity: 0.15; }
    .hero-number-display { gap: 16px; }
    .number-ring span { font-size: 24px; }
    .number-ring small { font-size: 12px; }
    .tech-tags { gap: 6px; max-width: 280px; }
    .tech-tag { padding: 5px 10px; font-size: 11px; }
    .hero-dots { bottom: 24px; }
    .scroll-hint { display: none; }

    /* Services mobile */
    .services-grid { grid-template-columns: 1fr; gap: 16px; }
    .service-card { padding: 24px 20px; }

    /* Advantages mobile */
    .advantages-grid { grid-template-columns: 1fr; gap: 16px; }
    .advantage-card { padding: 24px 20px; }
    .advantage-num { font-size: 36px; }

    /* Process mobile */
    .process-steps { flex-direction: column; align-items: center; gap: 0; }
    .process-line { width: 2px; height: 20px; margin: 0; }
    .process-step { width: auto; padding: 8px 0; }

    /* Cases mobile */
    .cases-grid { grid-template-columns: 1fr; gap: 16px; }
    .case-img { height: 160px; }
    .cases-filter { gap: 8px; }
    .filter-btn { padding: 6px 16px; font-size: 13px; }

    /* About mobile */
    .about-content { grid-template-columns: 1fr; gap: 32px; }
    .about-highlights { grid-template-columns: 1fr; }
    .about-lead { font-size: 18px; }
    .about-img-grid { grid-template-columns: 1fr; }
    .about-img-item.img-large { grid-row: auto; min-height: 160px; }

    /* Tech mobile */
    .tech-grid { grid-template-columns: 1fr; gap: 16px; }
    .tech-group { padding: 16px; }

    /* CTA mobile */
    .cta { padding: 60px 0; }
    .cta-content h2 { font-size: 24px; }
    .cta-content p { font-size: 14px; }
    .cta-btns { flex-direction: column; align-items: center; }
    .cta-btns .btn { width: 100%; max-width: 280px; }

    /* Contact mobile */
    .contact-grid { grid-template-columns: 1fr; gap: 32px; }
    .form-row { grid-template-columns: 1fr; }
    .contact-form { padding: 24px 20px; }
    .contact-notice { padding: 16px; }
    .notice-steps { flex-wrap: wrap; }

    /* Page Banner mobile */
    .page-banner { padding: 120px 0 40px; }
    .page-banner-title { font-size: 28px; }

    /* Service Detail mobile */
    .service-detail { padding: 60px 0; }
    .service-detail-card { flex-direction: column; gap: 16px; padding: 20px; }
    .service-detail-icon { width: 48px; font-size: 32px; }
    .service-detail-list { grid-template-columns: 1fr; }

    /* Articles mobile */
    .articles-grid { grid-template-columns: 1fr; gap: 16px; }
    .article-body { padding: 16px; }

    /* Section more */
    .section-more { margin-top: 32px; }

    /* Footer mobile */
    .footer { padding: 40px 0 0; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .footer-brand .logo { font-size: 20px; }

    /* Admin mobile */
    .admin-container { flex-direction: column; padding: 0 12px; }
    .admin-sidebar { width: 100%; }
    .admin-nav { display: flex; flex-wrap: wrap; gap: 4px; position: static; }
    .admin-nav-link { padding: 8px 12px; font-size: 13px; }
    .admin-table { font-size: 12px; }
    .admin-table th, .admin-table td { padding: 8px; }
    .admin-form { padding: 16px; }
    .upload-area { padding: 40px 16px; }
}

/* 小屏手机适配 (<=375px) */
@media (max-width: 375px) {
    .hero-title { font-size: 24px; }
    .hero-desc { font-size: 13px; }
    .section-title { font-size: 24px; }
    .page-banner-title { font-size: 24px; }
    .btn { padding: 10px 20px; font-size: 14px; }
    .advantage-icon { font-size: 28px; }
    .tech-group h4 { font-size: 14px; }
}

/* 大屏优化 (>=1440px) */
@media (min-width: 1440px) {
    .container { max-width: 1320px; }
    .hero-title { font-size: 60px; }
    .hero-desc { font-size: 20px; }
    .services-grid-4 { grid-template-columns: repeat(4, 1fr); }
}