/* Self-hosted Inter (variable 300-700).
   Google Fonts is unreachable in mainland China and blocked the first paint,
   so the font is served locally from assets/fonts/. */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url('fonts/inter-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url('fonts/inter-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
*, *::before, *::after { margin:0; padding:0; box-sizing: border-box; }

.visually-hidden {
    position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

:root {
    /* Brand — Dassault Systèmes (3DS) inspired blue system */
    --accent: #0072B5;        /* main authoritative blue */
    --accent-deep: #00507F;   /* darker, for pressed / hover base */
    --accent-bright: #009BDE;  /* bright interaction blue (3DS compass) */
    --accent-ink: #003354;
    --accent-tint: #E9F3FA;
    --accent-line: #BEDCEE;

    /* Refined neutrals (cool, sophisticated) */
    --ink: #0B1F2E;
    --text: #45586A;
    --text-soft: #697C8E;
    --muted: #91A3B2;
    --line: #E4EBF1;
    --line-soft: #EEF3F7;

    --white: #FFFFFF;
    --bg-soft: #F5F9FC;
    --bg-band: #EEF5FB;
    --deep: #00263D;

    --shadow-sm: 0 1px 2px rgba(15,30,45,0.04);
    --shadow-card: 0 18px 48px rgba(15,30,45,0.07);
    --shadow-card-hover: 0 26px 60px rgba(12,44,68,0.14);
    --t: 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    color: var(--ink);
    line-height: 1.65;
    background: var(--white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a { text-decoration: none; color: inherit; transition: var(--t); }
ul { list-style: none; }
::selection { background: var(--accent-bright); color: #fff; }

/* Full-width band wrapper */
.band { width: 100%; }
.band-inner { max-width: 1680px; margin:0 auto; padding: 0 6vw; }

/* ============ HEADER ============ */
.site-header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    height: 78px;
    background: rgba(255,255,255,0.82);
    backdrop-filter: blur(22px) saturate(160%);
    -webkit-backdrop-filter: blur(22px) saturate(160%);
    border-bottom: 1px solid rgba(230,236,241,0.7);
    transition: box-shadow 0.3s ease;
}
.site-header > .band-inner {
    height: 100%; display: flex; align-items: center; justify-content: space-between;
}
.site-logo { display: flex; align-items: center; gap: 11px; }
.logo-img { height: 40px; width: auto; display: block; }
.site-nav { display: flex; align-items: center; gap: 0; flex-wrap: wrap; }
.site-nav a { font-size: 0.9rem; color: var(--text); font-weight: 500; position: relative; letter-spacing: 0.2px; }
.site-nav a::after {
    content: ''; position: absolute; bottom: -7px; left: 0; width: 0; height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-bright));
    transition: width 0.35s ease; border-radius: 2px;
}
.site-nav a:hover { color: var(--accent); }
.site-nav a:hover::after { width: 100%; }
.nav-group { display: flex; align-items: center; gap: 22px; padding: 0 30px; position: relative; }
.nav-group:first-child { padding-left: 0; }
.nav-toggle {
    display: none; width: 44px; height: 44px; border: 1px solid var(--line);
    background: transparent; border-radius: 8px; flex-direction: column;
    align-items: center; justify-content: center; gap: 5px; cursor: pointer;
}
.nav-toggle span { display: block; width: 18px; height: 2px; background: var(--ink); border-radius: 2px; }
.nav-toggle:hover span { background: var(--accent); }

/* Scroll-reveal: hidden only when JS is on (.js set in <head>); visible without JS. */
.js .sol-card, .js .ind-card, .js .logo-tile { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
.js .sol-card.in, .js .ind-card.in, .js .logo-tile.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
    .js .sol-card, .js .ind-card, .js .logo-tile { opacity: 1; transform: none; transition: none; }
    .client-track, .client-track--rev, .sysi-track { animation: none !important; }
}

/* ============ HERO BAND (white, full screen, centered) ============ */
.hero {
    min-height: 100vh; display: flex; flex-direction: column;
    align-items: center; justify-content: center; text-align: center;
    background: var(--white); position: relative; overflow: hidden;
    padding: 130px 6vw 96px;
}
.hero::before {
    content: ''; position: absolute; top: -180px; right: -180px;
    width: 560px; height: 560px; border-radius: 50%;
    background: radial-gradient(circle, rgba(0,155,222,0.10), transparent 70%);
}
.hero::after {
    content: ''; position: absolute; bottom: -160px; left: -160px;
    width: 500px; height: 500px; border-radius: 50%;
    background: radial-gradient(circle, rgba(0,114,181,0.07), transparent 70%);
}
.hero-inner { position: relative; z-index: 2; max-width: 1000px; width: 100%; }
.hero h1 {
    font-size: clamp(2.9rem, 5.4vw, 5.6rem); font-weight: 300; line-height: 1.06; letter-spacing: -2.4px;
    color: var(--ink); margin-bottom: 30px;
}
.hero h1 strong { font-weight: 700; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero-subtitle {
    font-size: clamp(1.05rem, 1.3vw, 1.28rem); color: var(--text);
    max-width: 680px; margin: 0 auto 46px; line-height: 1.8; font-weight: 400;
}
.hero-actions { display: flex; gap: 16px; align-items: center; justify-content: center; flex-wrap: wrap; }
.btn-primary {
    padding: 16px 42px;
    background: linear-gradient(135deg, var(--accent), var(--accent-bright));
    color: #fff;
    font-size: 0.95rem; font-weight: 600; border-radius: 10px; transition: var(--t);
    display: inline-flex; align-items: center; gap: 10px;
    box-shadow: 0 8px 24px rgba(0,114,181,0.28);
}
.btn-primary:hover { background: linear-gradient(135deg, var(--accent-deep), var(--accent)); transform: translateY(-2px); box-shadow: 0 14px 34px rgba(0,114,181,0.40); }
.btn-secondary {
    padding: 16px 38px; background: transparent; color: var(--ink);
    font-size: 0.95rem; font-weight: 600; border: 1.5px solid var(--line);
    border-radius: 10px; transition: var(--t);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-tint); }

.hero-stats {
    display: flex; gap: 76px; margin-top: 84px; padding-top: 46px;
    border-top: 1px solid var(--line); flex-wrap: wrap; justify-content: center;
}
.hero-stat .stat-number {
    font-size: clamp(2.3rem, 3.5vw, 3.1rem); font-weight: 300; color: var(--ink);
    line-height: 1; letter-spacing: -1.5px;
}
.hero-stat .stat-number strong { font-weight: 700; color: var(--accent); }
.hero-stat .stat-label { font-size: 0.84rem; color: var(--text-soft); margin-top: 11px; letter-spacing: 0.5px; font-weight: 500; }

/* ============ SECTION COMMON ============ */
.section { padding: 140px 0; }
.section-head { text-align: center; margin: 0 auto 84px; max-width: 740px; }
.section-label {
    display: inline-block; font-size: 0.78rem; letter-spacing: 4.5px; text-transform: uppercase;
    color: var(--accent); font-weight: 700; margin-bottom: 20px;
}
.section-title {
    font-size: clamp(2rem, 3.5vw, 3.3rem); font-weight: 300; letter-spacing: -1.2px; color: var(--ink); line-height: 1.18;
}
.section-title strong { font-weight: 700; }
.section-desc {
    font-size: clamp(1rem, 1.1vw, 1.12rem); color: var(--text); margin-top: 20px; line-height: 1.8;
}

/* ============ SOFT BAND (pale blue) ============ */
.band-soft { background: var(--bg-band); }

/* ============ CORE SOLUTIONS (Four Business Directions) ============ */
#solutions { padding: 92px 0; }
.solutions-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.sol-card {
    background: var(--white); border: 1px solid var(--line);
    border-radius: 18px; padding: 42px 44px; position: relative; overflow: hidden;
    transition: var(--t); box-shadow: var(--shadow-card); cursor: default;
}
.sol-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--accent-bright));
    transform: scaleX(0); transform-origin: left; transition: transform 0.4s ease;
    border-radius: 18px 18px 0 0;
}
.sol-card:hover { border-color: var(--accent-line); box-shadow: var(--shadow-card-hover); transform: translateY(-6px); }
.sol-card:hover::before { transform: scaleX(1); }
.sol-card h3 { font-size: clamp(1.2rem, 1.55vw, 1.42rem); font-weight: 600; color: var(--ink); margin-bottom: 14px; letter-spacing: -0.3px; }
.sol-card p { font-size: 0.98rem; color: var(--text); line-height: 1.76; margin-bottom: 22px; }
.sol-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.sol-tag {
    padding: 6px 15px; background: var(--accent-tint); border: 1px solid var(--accent-line);
    border-radius: 8px; font-size: 0.8rem; color: var(--accent-deep); font-weight: 500;
}
/* "learn more" links that jump to level-2 pages */
.learn-more {
    display: inline-flex; align-items: center; gap: 8px;
    margin-top: 22px; font-size: 0.9rem; font-weight: 600; color: var(--accent);
}
.learn-more .arrow { transition: transform 0.3s ease; }
.sol-card:hover .learn-more .arrow,
.ind-card:hover .learn-more .arrow,
.sysi-head:hover .learn-more .arrow { transform: translateX(6px); }

/* ============ LOGO WALL (shared) ============ */
.logo-wall { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.logo-tile {
    background: var(--white); border: 1px solid var(--line);
    border-radius: 14px; min-height: 132px;
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 9px;
    padding: 24px 20px; transition: var(--t); cursor: default; text-align: center;
}
.logo-tile:hover { border-color: var(--accent-line); background: var(--accent-tint); transform: translateY(-5px); box-shadow: var(--shadow-card); }
.logo-mark {
    font-size: 1.32rem; font-weight: 700; letter-spacing: 0.3px; color: var(--ink);
    transition: var(--t); line-height: 1.15;
}
.logo-tile:hover .logo-mark { color: var(--accent); }
.logo-caption { font-size: 0.68rem; letter-spacing: 1.6px; text-transform: uppercase; color: var(--muted); transition: var(--t); }
.logo-tile:hover .logo-caption { color: var(--accent-deep); }

/* ============ CLIENT MARQUEE (auto-scroll, pause on hover) ============ */
.client-marquee {
    display: flex; flex-direction: column; gap: 14px;
    overflow: hidden;
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
    mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.client-track {
    display: flex; gap: 14px; width: max-content;
    animation: marquee-left 46s linear infinite;
}
.client-track--rev { animation: marquee-right 46s linear infinite; animation-delay: -23s; }
.client-marquee:hover .client-track { animation-play-state: paused; }
.client-logo {
    width: 184px; height: 84px; flex: 0 0 auto;
    display: flex; align-items: center; justify-content: center;
    background: var(--white); border: 1px solid var(--line); border-radius: 12px;
    font-size: 1.05rem; font-weight: 700; letter-spacing: 0.3px; color: var(--ink);
    transition: var(--t);
}
.client-logo:hover { border-color: var(--accent-line); color: var(--accent); background: var(--accent-tint); }
@keyframes marquee-right { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@keyframes marquee-left  { from { transform: translateX(-50%); } to { transform: translateX(0); } }

/* ============ SYSTEM INTEGRATION STRIP (within solutions) ============ */
.sysi { margin-top: 26px; padding-top: 24px; border-top: 1px solid var(--line); }
.sysi-head { margin-bottom: 16px; text-align: center; }
.sysi-title { font-size: clamp(1.1rem, 1.5vw, 1.35rem); font-weight: 600; color: var(--ink); letter-spacing: -0.3px; }
.sysi-marquee {
    overflow: hidden;
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
    mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
}
.sysi-track { display: flex; gap: 18px; width: max-content; animation: marquee-left 42s linear infinite; }
.sysi-marquee:hover .sysi-track { animation-play-state: paused; }
.sysi-slide {
    flex: 0 0 auto; width: 268px; height: 150px; border-radius: 14px;
    background: linear-gradient(135deg, var(--accent-tint), #ffffff);
    border: 1px solid var(--line);
    display: flex; align-items: center; justify-content: center; text-align: center;
    color: var(--accent-deep); font-weight: 600; font-size: 1rem; letter-spacing: 0.4px;
    transition: var(--t); text-decoration: none;
}
.sysi-slide:hover { border-color: var(--accent-line); box-shadow: var(--shadow-card-hover); transform: translateY(-4px); color: var(--accent); }
.sysi-img { flex: 0 0 auto; width: 268px; height: 150px; object-fit: cover; border-radius: 14px; border: 1px solid var(--line); }
@media (max-width: 600px) {
    .sysi-slide, .sysi-img { width: 210px; height: 124px; font-size: 0.9rem; }
}

/* ============ INDUSTRY GRID (pale blue) ============ */
.ind-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.ind-card {
    background: var(--white); border: 1px solid var(--line);
    border-radius: 18px; padding: 38px 34px; position: relative; overflow: hidden;
    transition: var(--t); box-shadow: var(--shadow-card);
}
.ind-card::before {
    content: ''; position: absolute; top:0; left:0; right:0; height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-bright));
    transform: scaleX(0); transform-origin: left; transition: transform 0.4s ease;
}
.ind-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-5px); }
.ind-card:hover::before { transform: scaleX(1); }
.ind-card h3 { font-size: 1.18rem; font-weight: 600; color: var(--ink); margin-bottom: 12px; letter-spacing: -0.2px; }
.ind-card p { font-size: 0.92rem; color: var(--text-soft); line-height: 1.75; margin-bottom: 18px; }
.ind-tags { display: flex; flex-wrap: wrap; gap: 9px; }
.ind-tag {
    padding: 5px 13px; background: var(--bg-soft); border: 1px solid var(--line);
    border-radius: 7px; font-size: 0.76rem; color: var(--text-soft); font-weight: 500; transition: var(--t);
}
.ind-card:hover .ind-tag { border-color: var(--accent-line); color: var(--accent); background: var(--accent-tint); }

/* ============ FOOTER (deep navy, 3 nav columns + compact contact card with phones, socials, QR) ============ */
/* Kept in sync with assets/site.css footer block so the home page matches every other page. */
.site-footer { background: var(--deep); color: rgba(255,255,255,0.78); padding: 64px 0 28px; }
.footer-top { display: grid; grid-template-columns: 1fr 1fr 1fr 1.35fr; gap: 44px; padding-bottom: 44px; border-bottom: 1px solid rgba(255,255,255,0.1); align-items: start; }
.footer-col h4 { font-size: 0.95rem; font-weight: 600; color: #fff; margin: 0 0 18px; letter-spacing: 0.3px; }
.footer-col ul { display: flex; flex-direction: column; gap: 12px; margin: 0; padding: 0; list-style: none; }
.footer-col a { font-size: 0.86rem; color: rgba(255,255,255,0.62); transition: var(--t); }
.footer-col a:hover { color: #fff; }
/* --- Contact card (matches the Chinese site footer) --- */
.footer-contact { display: flex; flex-direction: column; gap: 12px; }
.footer-contact p.c-phone { margin: 0; display: flex; align-items: baseline; gap: 10px; line-height: 1.45; }
.footer-contact .lbl { font-size: 0.72rem; letter-spacing: 1.4px; text-transform: uppercase; color: rgba(255,255,255,0.5); min-width: 44px; }
.footer-contact .tel-link {
    color: var(--accent-bright);
    font-size: 1.05rem;
    font-weight: 600;
    text-decoration: none;
    letter-spacing: 0.2px;
}
.footer-contact .tel-link:hover { color: #fff; text-decoration: underline; }
/* 3 round social icons (mirrors Chinese footer) */
.footer-contact .footer-social { display: flex; gap: 14px; margin-top: 6px; }
.footer-contact .social-ic {
    width: 38px; height: 38px; border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.18); background: rgba(255,255,255,0.04);
    display: flex; align-items: center; justify-content: center;
    color: rgba(255,255,255,0.78); transition: var(--t);
}
.footer-contact .social-ic svg { width: 18px; height: 18px; fill: currentColor; display: block; }
.footer-contact .social-ic:hover { background: var(--accent); border-color: var(--accent); color: #fff; transform: translateY(-3px); box-shadow: 0 8px 20px rgba(0,114,181,0.42); }
/* WeChat QR (or graceful placeholder when image missing) */
.footer-contact .footer-qr {
    display: inline-flex; align-self: flex-start;
    margin-top: 12px; background: #fff; padding: 6px;
    border-radius: 6px; transition: var(--t);
}
.footer-contact .footer-qr img { display: block; width: 132px; height: 132px; object-fit: contain; }
.footer-contact .footer-qr:hover { transform: translateY(-2px); box-shadow: 0 12px 24px rgba(0,0,0,0.3); }
/* Fallback when QR image fails to load: render a neutral placeholder block */
.footer-contact .footer-qr.qr-fallback { background: rgba(255,255,255,0.06); padding: 28px 18px; color: rgba(255,255,255,0.45); font-size: 0.78rem; letter-spacing: 1px; }
.footer-contact .qr-hint { margin: 10px 0 0; font-size: 0.78rem; color: rgba(255,255,255,0.5); letter-spacing: 0.4px; }
/* Bottom legal / copyright strip */
.footer-bot { display: flex; justify-content: space-between; align-items: center; padding-top: 24px; font-size: 0.8rem; color: rgba(255,255,255,0.5); flex-wrap: wrap; gap: 12px; }
.footer-bot a { color: rgba(255,255,255,0.34); }
.footer-bot a:hover { color: rgba(255,255,255,0.66); }
.footer-legal { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.footer-legal .legal-links a { color: rgba(255,255,255,0.34); }
.footer-legal .legal-links a:hover { color: rgba(255,255,255,0.66); }

/* ============ NOSCRIPT FALLBACK ============ */
.noscript-content { max-width: 900px; margin: 0 auto; padding: 60px 6vw; }
.noscript-content h1 { font-size: 1.8rem; margin-bottom: 16px; }
.noscript-content h2 { font-size: 1.2rem; margin: 28px 0 12px; }
.noscript-content ul { list-style: disc; padding-left: 22px; }
.noscript-content li { margin-bottom: 8px; line-height: 1.7; }

/* ============ RESPONSIVE ============ */
@media (max-width: 1280px) {
    .band-inner { padding: 0 5vw; }
    .hero-stats { gap: 54px; }
    /* Mid width: 3 nav cols + slightly wider contact card */
    .footer-top { grid-template-columns: 1fr 1fr 1fr 1.55fr; gap: 36px; }
}
@media (max-width: 1024px) {
    .logo-wall { grid-template-columns: repeat(2, 1fr); }
    .ind-grid { grid-template-columns: repeat(2, 1fr); }
    /* Footer: 2 equal columns, contact spans full width */
    .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
    .footer-col { grid-column: auto; }
    .footer-col.footer-contact { grid-column: 1 / -1; max-width: 420px; }
}
@media (max-width: 768px) {
    .band-inner, .hero { padding-left: 22px; padding-right: 22px; }
    .nav-toggle { display: inline-flex; }
    .site-nav {
        position: fixed; top: 78px; left: 0; right: 0; z-index: 999;
        display: none; flex-direction: column; align-items: stretch; gap: 0;
        background: rgba(255,255,255,0.98); border-bottom: 1px solid var(--line);
        box-shadow: 0 18px 40px rgba(15,30,45,0.12); padding: 12px 22px 18px;
    }
    .site-nav.open { display: flex; }
    .site-nav .nav-group { flex-direction: column; align-items: stretch; gap: 2px; padding: 0; }
    .site-nav a { display: block; padding: 13px 4px; font-size: 1rem; }
    .site-nav a::after { display: none; }
    body.nav-open { overflow: hidden; }
    .hero h1 { font-size: 2.4rem; }
    .hero-subtitle { font-size: 1rem; }
    .hero-stats { flex-wrap: wrap; gap: 30px; }
    .section { padding: 76px 0; }
    .section-title { font-size: 1.9rem; }
    .logo-wall { grid-template-columns: 1fr; }
    .ind-grid { grid-template-columns: 1fr; }
    .solutions-grid { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr; }
    .footer-bot { flex-direction: column; gap: 16px; text-align: center; }
    .footer-legal, .footer-social { justify-content: center; }
    .client-logo { width: 150px; height: 72px; font-size: 0.95rem; }
}
.noscript-content { padding: 40px; font-size: 1rem; }