:root {
  color-scheme: light;
  --ink: #14233b;
  --ink-strong: #0b1730;
  --muted: #63718a;
  --line: #e4eaf2;
  --paper: #ffffff;
  --soft: #f4f7fb;
  --navy: #0b1730;
  --navy-light: #132748;
  --blue: #3767f5;
  --blue-dark: #2451dc;
  --cyan: #58d6d1;
  --green: #38b89b;
  --font: 'Be Vietnam Pro', 'Manrope', sans-serif;
  --radius: 18px;
  --shadow: 0 18px 50px rgba(19, 39, 72, 0.1);
  --ease: 220ms ease;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 90px; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--font); font-size: 15px; line-height: 1.75; -webkit-font-smoothing: antialiased; }
body, button, input, select, textarea { font-family: var(--font); }
button, input, select, textarea { font-size: inherit; }
a { color: inherit; text-decoration: none; }
button { color: inherit; }
img, svg { display: block; max-width: 100%; }
::selection { color: #fff; background: var(--blue); }
.container { width: min(1180px, calc(100% - 48px)); margin-inline: auto; }

/* Header and navigation */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.94); border-bottom: 1px solid rgba(222,230,240,.85); backdrop-filter: blur(16px); transition: box-shadow var(--ease); }
.site-header.scrolled { box-shadow: 0 8px 28px rgba(12,31,61,.08); }
.navbar { min-height: 78px; display: flex; align-items: center; gap: 30px; }
.brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; }
.brand-mark { width: 42px; height: 42px; display: grid; place-items: center; overflow: hidden; background: #f4f7fc; border: 1px solid #e6ebf4; border-radius: 13px; flex: 0 0 42px; }
.brand-symbol { width: 100%; height: 100%; object-fit: contain; }
.brand-mark > span { color: #89e4dd; }
.brand-copy { display: grid; line-height: 1.35; }
.brand-copy strong { color: var(--ink-strong); font-size: 14px; font-weight: 800; }
.brand-copy small { color: #8390a5; font-size: 10px; font-weight: 600; letter-spacing: .015em; }
.nav-menu { display: flex; align-items: center; justify-content: flex-end; gap: clamp(16px, 2.4vw, 34px); margin-left: auto; }
.nav-menu > a { color: #526079; font-size: 12px; font-weight: 600; transition: color var(--ease); }
.nav-menu > a:hover { color: var(--blue); }
.nav-menu .nav-cta { display: inline-flex; align-items: center; gap: 9px; padding: 10px 15px; color: var(--blue); background: #f0f4ff; border-radius: 9px; }
.nav-menu .nav-cta:hover { color: #fff; background: var(--blue); }
.nav-cta i { font-size: 10px; }
.language-switch { display: inline-flex; gap: 2px; padding: 3px; background: #f2f5fa; border: 1px solid #e7ebf2; border-radius: 9px; flex: 0 0 auto; }
.language-option { min-width: 32px; padding: 6px 7px; color: #77839a; background: transparent; border: 0; border-radius: 6px; font-size: 10px; font-weight: 800; cursor: pointer; transition: all var(--ease); }
.language-option.language-chinese { min-width: 39px; }
.language-option:hover { color: var(--ink); }
.language-option.active { color: #fff; background: var(--navy); box-shadow: 0 2px 6px rgba(11,23,48,.16); }
.language-option:focus-visible, .menu-toggle:focus-visible, a:focus-visible, button:focus-visible { outline: 3px solid rgba(55,103,245,.5); outline-offset: 3px; }
.menu-toggle { display: none; }
body.menu-open { overflow: hidden; }

/* Hero */
.hero { position: relative; overflow: hidden; color: #fff; background: radial-gradient(ellipse at 80% 30%, rgba(49,112,207,.23), transparent 36%), linear-gradient(115deg, #0a162d 2%, #0e1e3c 58%, #102b50 100%); }
.hero::before { position: absolute; inset: 0; content: ''; opacity: .18; pointer-events: none; background-image: linear-gradient(rgba(164,195,235,.13) 1px, transparent 1px), linear-gradient(90deg, rgba(164,195,235,.13) 1px, transparent 1px); background-size: 54px 54px; mask-image: linear-gradient(90deg, transparent 5%, #000 100%); }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.02fr .98fr; align-items: center; gap: clamp(42px, 7vw, 100px); min-height: 580px; padding-top: 68px; padding-bottom: 55px; }
.hero-copy { max-width: 630px; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; color: #536a91; font-size: 10px; font-weight: 800; letter-spacing: .13em; line-height: 1.4; }
.eyebrow-light { color: #9bb0d0; }
.eyebrow-line { width: 25px; height: 2px; background: var(--blue); border-radius: 3px; }
.eyebrow-light .eyebrow-line { background: var(--cyan); }
.status-dot { width: 7px; height: 7px; flex: 0 0 7px; background: #59d4bd; border-radius: 50%; box-shadow: 0 0 0 4px rgba(89,212,189,.12); }
.hero h1 { display: grid; gap: 1px; margin: 25px 0 20px; color: #fff; font-size: clamp(42px, 5vw, 67px); font-weight: 800; letter-spacing: -.065em; line-height: 1.14; }
.hero-highlight { color: #86e1dc; }
.hero-lead { max-width: 610px; margin: 0; color: #b5c2d7; font-size: clamp(14px, 1.4vw, 16px); line-height: 1.9; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; margin-top: 31px; }
.button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; gap: 12px; padding: 11px 17px; border: 1px solid transparent; border-radius: 9px; font-size: 12px; font-weight: 700; transition: transform var(--ease), box-shadow var(--ease), color var(--ease), background var(--ease); cursor: pointer; }
.button:hover { transform: translateY(-2px); }
.button i { font-size: 11px; }
.button-primary { color: #fff; background: var(--blue); box-shadow: 0 10px 24px rgba(55,103,245,.25); }
.button-primary:hover { background: #4775ff; box-shadow: 0 14px 28px rgba(55,103,245,.34); }
.button-quiet { color: #e1e8f4; border-color: rgba(193,210,235,.22); background: rgba(255,255,255,.04); }
.button-quiet:hover { border-color: rgba(193,210,235,.48); background: rgba(255,255,255,.08); }
.hero-assurance { display: flex; align-items: flex-start; gap: 9px; margin-top: 24px; color: #9aacc6; font-size: 11px; }
.hero-assurance i { margin-top: 4px; color: #76dfcf; font-size: 13px; }

/* Architecture illustration */
.hero-visual { position: relative; min-height: 400px; display: grid; place-items: center; }
.visual-glow { position: absolute; width: min(420px, 85%); aspect-ratio: 1; border-radius: 50%; background: radial-gradient(circle, rgba(54,123,220,.25), rgba(54,123,220,.03) 62%, transparent 72%); filter: blur(5px); }
.architecture-card { position: relative; z-index: 2; width: min(445px, 100%); padding: 21px; background: linear-gradient(150deg, rgba(28,50,83,.92), rgba(14,30,55,.9)); border: 1px solid rgba(174,201,236,.2); border-radius: 17px; box-shadow: 0 30px 80px rgba(0,0,0,.28), inset 0 1px 0 rgba(255,255,255,.06); backdrop-filter: blur(12px); transform: perspective(1100px) rotateY(-5deg) rotateX(2deg); }
.architecture-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; padding-bottom: 16px; border-bottom: 1px solid rgba(205,220,242,.12); }
.architecture-top > div { display: grid; gap: 4px; }
.tiny-label, .floating-note small { color: #7e96b9; font-size: 8px; font-weight: 800; letter-spacing: .13em; }
.architecture-top strong { color: #f0f5fc; font-size: 13px; font-weight: 700; }
.live-pill { display: inline-flex; align-items: center; gap: 7px; padding: 6px 8px; color: #a8e6d9; background: rgba(52,174,147,.12); border: 1px solid rgba(91,215,183,.16); border-radius: 20px; font-size: 9px; font-weight: 700; white-space: nowrap; }
.live-pill .status-dot { width: 5px; height: 5px; flex-basis: 5px; box-shadow: none; }
.architecture-flow { display: grid; grid-template-columns: .7fr 50px 1.2fr; align-items: center; gap: 10px; padding: 20px 0; }
.architecture-node { min-width: 0; display: flex; align-items: center; gap: 10px; padding: 12px 10px; color: #d4dfef; background: rgba(9,22,44,.64); border: 1px solid rgba(168,193,227,.13); border-radius: 10px; font-size: 10px; font-weight: 600; }
.architecture-node i { color: #8aaafa; font-size: 13px; }
.architecture-node b { margin-left: auto; color: #6f87a9; font-size: 9px; font-weight: 600; }
.node-client { min-height: 54px; flex-direction: column; justify-content: center; gap: 4px; text-align: center; }
.node-client i { color: #7de0d3; }
.flow-line { position: relative; height: 1px; background: rgba(105,153,215,.35); }
.flow-line::before, .flow-line::after { position: absolute; top: -15px; left: 0; width: 100%; height: 30px; border-top: 1px solid rgba(105,153,215,.2); border-bottom: 1px solid rgba(105,153,215,.2); content: ''; }
.flow-line span { position: absolute; z-index: 1; top: -2px; left: 40%; width: 5px; height: 5px; background: var(--cyan); border-radius: 50%; box-shadow: 0 0 10px var(--cyan); }
.node-stack { display: grid; gap: 8px; }
.architecture-footer { display: flex; justify-content: space-between; gap: 10px; padding-top: 13px; border-top: 1px solid rgba(205,220,242,.12); }
.architecture-footer > span { display: inline-flex; align-items: center; gap: 7px; color: #9eb0ca; font-size: 9px; }
.architecture-footer i { color: #74d9ca; font-size: 10px; }
.floating-note { position: absolute; z-index: 3; right: -10px; bottom: 15px; display: flex; align-items: center; gap: 11px; padding: 12px 15px; color: #eaf1fb; background: #193456; border: 1px solid rgba(170,201,235,.2); border-radius: 12px; box-shadow: 0 16px 34px rgba(2,11,24,.25); }
.note-icon { width: 34px; height: 34px; display: grid; place-items: center; color: #86e5da; background: rgba(90,209,195,.1); border-radius: 9px; }
.floating-note > span:last-child { display: grid; gap: 3px; }
.floating-note strong { font-size: 10px; }
.visual-orbit { position: absolute; border: 1px solid rgba(129,169,224,.16); border-radius: 50%; transform: rotate(-25deg); }
.orbit-one { width: 470px; height: 165px; }
.orbit-two { width: 390px; height: 120px; transform: rotate(35deg); }
.hero-bottom { position: relative; z-index: 1; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-top: 22px; padding-bottom: 24px; border-top: 1px solid rgba(188,209,239,.15); }
.hero-bottom > span { color: #8296b5; font-size: 8px; font-weight: 800; letter-spacing: .14em; }
.audience-chips { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }
.audience-chips span { padding: 6px 10px; color: #b2c2d9; background: rgba(255,255,255,.045); border: 1px solid rgba(193,210,235,.12); border-radius: 20px; font-size: 9px; font-weight: 600; }

/* Shared sections */
.section { padding: 100px 0; }
.section-heading { max-width: 720px; margin-bottom: 43px; }
.section-heading h2, .process-intro h2 { max-width: 730px; margin: 15px 0 12px; color: var(--ink-strong); font-size: clamp(29px, 3.5vw, 43px); font-weight: 800; letter-spacing: -.05em; line-height: 1.25; }
.section-heading > p, .process-intro > p { max-width: 650px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.9; }
.services-section { background: #fff; }
.services-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; }
.service-card { min-height: 270px; display: flex; flex-direction: column; align-items: flex-start; padding: 23px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease); }
.service-card:last-child { grid-column: 2; }
.service-card:hover { transform: translateY(-5px); border-color: #cdd8f5; box-shadow: var(--shadow); }
.service-card-top { width: 100%; display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 19px; }
.service-icon { width: 42px; height: 42px; display: grid; place-items: center; color: var(--blue); background: #eef3ff; border-radius: 12px; font-size: 16px; }
.service-index { color: #a2adbf; font-size: 10px; font-weight: 800; letter-spacing: .08em; }
.service-card h3 { margin: 0 0 9px; color: var(--ink-strong); font-size: 16px; font-weight: 800; letter-spacing: -.02em; }
.service-card p { margin: 0 0 16px; color: var(--muted); font-size: 11px; line-height: 1.8; }
.text-link { display: inline-flex; align-items: center; gap: 8px; margin-top: auto; color: var(--blue); font-size: 10px; font-weight: 800; }
.text-link i { transition: transform var(--ease); }
.text-link:hover i { transform: translateX(4px); }
.service-featured { background: linear-gradient(145deg, #f9fbff, #f2f6ff); border-color: #dce5fb; }

/* Expertise */
.expertise-section { position: relative; overflow: hidden; color: #fff; background: #0e1b34; }
.expertise-section::after { position: absolute; right: -220px; bottom: -400px; width: 700px; height: 700px; border: 1px solid rgba(133,172,226,.1); border-radius: 50%; content: ''; box-shadow: 0 0 0 60px rgba(133,172,226,.025), 0 0 0 120px rgba(133,172,226,.02); }
.expertise-layout { position: relative; z-index: 1; display: grid; grid-template-columns: .9fr 1.1fr; align-items: center; gap: clamp(40px, 8vw, 115px); }
.expertise-copy h2, .contact-copy h2 { margin: 17px 0 14px; color: #fff; font-size: clamp(30px, 3.6vw, 45px); font-weight: 800; letter-spacing: -.05em; line-height: 1.25; }
.expertise-copy > p, .contact-copy > p { margin: 0; color: #a8b7cf; font-size: 12px; line-height: 1.95; }
.button-light { margin-top: 25px; color: #172849; background: #fff; }
.button-light:hover { color: #fff; background: var(--blue); }
.expertise-panel { padding: 8px 23px; background: rgba(255,255,255,.045); border: 1px solid rgba(193,210,235,.12); border-radius: 15px; }
.profile-card { position: relative; width: min(100%, 410px); justify-self: center; padding: 11px; overflow: hidden; background: rgba(255,255,255,.07); border: 1px solid rgba(193,210,235,.18); border-radius: 19px; box-shadow: 0 25px 65px rgba(0,0,0,.25); }
.profile-section .profile-heading { display: grid; gap: 0; margin-top: 19px; font-size: clamp(37px, 4.2vw, 53px); letter-spacing: -.06em; line-height: 1.13; }
.profile-name { color: #86e1dc; text-shadow: 0 8px 32px rgba(74,202,194,.14); }
.profile-section .expertise-copy > p:first-of-type { max-width: 555px; color: #bdcadd; font-size: 13px; line-height: 1.95; }
.profile-section .expertise-copy > p.profile-note { max-width: 520px; margin-top: 18px; padding: 10px 0 10px 14px; color: #e0eafa; border-left: 2px solid #72d8cf; font-size: 11px; line-height: 1.8; }
.profile-skills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.profile-skills > span { display: inline-flex; align-items: center; gap: 8px; padding: 8px 10px; color: #d6e2f2; background: rgba(255,255,255,.055); border: 1px solid rgba(193,210,235,.14); border-radius: 8px; font-size: 9px; font-weight: 600; }
.profile-skills i { color: #81e0d6; font-size: 10px; }
.profile-photo-frame { width: 100%; aspect-ratio: 4 / 5; max-height: 465px; overflow: hidden; background: #e6e9f0; border: 1px solid rgba(255,255,255,.22); border-radius: 12px; }
.profile-photo-frame img { width: 100%; height: 100%; object-fit: cover; object-position: center 18%; transition: transform 450ms cubic-bezier(.2,.7,.25,1); }
.profile-card:hover .profile-photo-frame img { transform: scale(1.025); }
.profile-card-caption { display: grid; gap: 4px; padding: 15px 8px 8px; }
.profile-status { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 4px; color: #8fa5c3; font-size: 8px; font-weight: 800; letter-spacing: .1em; }
.profile-status .status-dot { width: 6px; height: 6px; flex-basis: 6px; box-shadow: none; }
.profile-card-caption > strong { color: #fff; font-size: 15px; font-weight: 800; }
.profile-card-caption > span:last-child { color: #aab9cf; font-size: 9px; }
.profile-decoration { position: absolute; top: 25px; right: 25px; display: flex; align-items: center; gap: 7px; padding: 8px 10px; color: #d4e3f7; background: rgba(11,23,48,.76); border: 1px solid rgba(255,255,255,.18); border-radius: 9px; backdrop-filter: blur(8px); font-size: 9px; }
.profile-decoration i { color: #80e1d7; }
.expertise-row { display: grid; grid-template-columns: 43px 1fr 14px; align-items: center; gap: 14px; padding: 20px 2px; border-bottom: 1px solid rgba(193,210,235,.1); }
.expertise-icon { width: 39px; height: 39px; display: grid; place-items: center; color: #85e1d7; background: rgba(97,203,190,.09); border: 1px solid rgba(97,203,190,.13); border-radius: 10px; font-size: 14px; }
.expertise-row > div { display: grid; gap: 3px; }
.expertise-row small { color: #8098ba; font-size: 8px; font-weight: 800; letter-spacing: .12em; }
.expertise-row strong { color: #f0f5fc; font-size: 12px; font-weight: 700; }
.expertise-row p { margin: 0; color: #9eafc8; font-size: 10px; }
.row-arrow { color: #7288a8; font-size: 10px; }
.technology-note { display: flex; gap: 10px; padding: 17px 2px 12px; color: #9eafc8; font-size: 9px; line-height: 1.7; }
.technology-note i { margin-top: 3px; color: #7f9dff; }

/* Audience */
.audience-section { background: var(--soft); }
.audience-section .section-heading { margin-inline: auto; text-align: center; }
.audience-section .section-heading h2, .audience-section .section-heading > p { margin-inline: auto; }
.audience-section .section-heading .eyebrow { justify-content: center; }
.audience-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); align-items: stretch; gap: 16px; }
.audience-card { padding: 25px; background: #fff; border: 1px solid #e6ebf3; border-radius: var(--radius); box-shadow: 0 8px 22px rgba(21,42,74,.025); }
.audience-card-featured { border-color: #d3def9; box-shadow: 0 12px 32px rgba(48,89,191,.08); }
.audience-label { display: inline-block; color: #7787a3; font-size: 8px; font-weight: 800; letter-spacing: .12em; }
.audience-icon { width: 43px; height: 43px; display: grid; place-items: center; margin: 20px 0 13px; color: #3868eb; background: #eff3ff; border-radius: 12px; }
.audience-card h3 { margin: 0 0 9px; color: var(--ink-strong); font-size: 16px; font-weight: 800; line-height: 1.45; letter-spacing: -.03em; }
.audience-card p { min-height: 76px; margin: 0; color: var(--muted); font-size: 10px; line-height: 1.9; }
.audience-card ul { display: grid; gap: 8px; margin: 18px 0 0; padding: 14px 0 0; list-style: none; border-top: 1px solid #edf0f5; }
.audience-card li { display: flex; align-items: center; gap: 8px; color: #50617d; font-size: 10px; font-weight: 600; }
.audience-card li i { color: #34a98d; font-size: 10px; }

/* Process */
.process-section { padding: 95px 0; background: #fff; }
.process-layout { display: grid; grid-template-columns: .8fr 1.2fr; align-items: start; gap: clamp(40px, 9vw, 130px); }
.process-intro h2 { font-size: clamp(30px, 3.5vw, 42px); }
.process-list { display: grid; }
.process-step { display: grid; grid-template-columns: 42px 1fr; gap: 17px; padding: 0 0 23px; }
.process-step + .process-step { padding-top: 22px; border-top: 1px solid var(--line); }
.process-step > span { width: 35px; height: 35px; display: grid; place-items: center; color: var(--blue); background: #eff3ff; border-radius: 10px; font-size: 10px; font-weight: 800; }
.process-step h3 { margin: 0 0 5px; color: var(--ink-strong); font-size: 13px; font-weight: 800; }
.process-step p { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.8; }

/* Contact and footer */
.contact-section { padding: 92px 0; color: #fff; background: linear-gradient(125deg, #0c1931, #10294b); }
.contact-layout { display: grid; grid-template-columns: .88fr 1.12fr; align-items: start; gap: clamp(38px, 7vw, 95px); }
.contact-copy { padding-top: 13px; }
.contact-copy h2 { font-size: clamp(32px, 3.7vw, 46px); }
.contact-copy > p { max-width: 470px; }
.contact-direct { display: grid; gap: 13px; margin-top: 29px; }
.contact-direct a { display: inline-flex; align-items: center; gap: 11px; width: fit-content; color: #d2deee; font-size: 11px; font-weight: 600; transition: color var(--ease); }
.contact-direct a:hover { color: #83e2d7; }
.contact-direct i { width: 17px; color: #77d9cd; text-align: center; }
.contact-form { padding: 27px; color: var(--ink); background: #fff; border: 1px solid rgba(225,234,246,.8); border-radius: 16px; box-shadow: 0 25px 70px rgba(0,0,0,.18); }
.form-heading { margin-bottom: 20px; }
.form-heading h3 { margin: 0 0 4px; color: var(--ink-strong); font-size: 17px; font-weight: 800; letter-spacing: -.03em; }
.form-heading p { margin: 0; color: #8894a8; font-size: 10px; }
.form-row { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 13px; }
.form-field { display: grid; gap: 6px; margin-bottom: 13px; }
.form-field label { color: #465571; font-size: 10px; font-weight: 700; }
.form-field input, .form-field select, .form-field textarea { width: 100%; min-width: 0; padding: 11px 12px; color: #182943; background: #fbfcfe; border: 1px solid #dfe5ee; border-radius: 8px; outline: none; font-size: 10px; transition: border-color var(--ease), box-shadow var(--ease), background var(--ease); }
.form-field input, .form-field select { min-height: 42px; }
.form-field textarea { min-height: 92px; resize: vertical; line-height: 1.6; }
.form-field input::placeholder, .form-field textarea::placeholder { color: #9aa5b6; }
.form-field input:focus, .form-field select:focus, .form-field textarea:focus { background: #fff; border-color: #7896fb; box-shadow: 0 0 0 3px rgba(55,103,245,.12); }
.submit-button { width: 100%; justify-content: space-between; min-height: 45px; margin-top: 1px; border: 0; }
.submit-button:disabled { cursor: wait; opacity: .7; transform: none; }
.form-success { display: none; align-items: center; gap: 8px; margin: 12px 0 0; padding: 10px 12px; color: #176f5a; background: #eaf8f3; border: 1px solid #c9eddf; border-radius: 8px; font-size: 10px; }
.form-success.show { display: flex; }
.botcheck { position: absolute; left: -9999px; }
.site-footer { padding: 23px 0; background: #091428; }
.footer-inner { display: flex; align-items: center; gap: 25px; }
.footer-brand .brand-mark { width: 36px; height: 36px; font-size: 13px; }
.footer-wordmark { width: 112px; height: 112px; flex: 0 0 112px; padding: 5px; object-fit: contain; background: #fff; border: 1px solid #e5eaf2; border-radius: 14px; }
.footer-brand .brand-copy strong { color: #ecf2fb; font-size: 12px; }
.footer-brand .brand-copy small { color: #8192ad; }
.footer-inner > p { max-width: 420px; margin: 0 auto 0 0; color: #8c9bb2; font-size: 9px; }
.copyright { flex: 0 0 auto; color: #71819b; font-size: 9px; }
.back-to-top { position: fixed; right: 22px; bottom: 82px; z-index: 30; width: 40px; height: 40px; display: grid; place-items: center; color: #fff; background: var(--blue); border: 0; border-radius: 10px; box-shadow: 0 8px 20px rgba(35,77,187,.28); opacity: 0; pointer-events: none; transform: translateY(8px); transition: all var(--ease); cursor: pointer; }
.back-to-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }

/* Floating quick contact */
.quick-contact { position: fixed; right: 22px; bottom: 20px; z-index: 60; display: flex; flex-direction: column; align-items: flex-end; gap: 12px; }
.quick-contact-toggle { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 0 17px; color: #fff; background: linear-gradient(135deg, #3767f5, #244fd0); border: 1px solid rgba(255,255,255,.18); border-radius: 15px; box-shadow: 0 12px 30px rgba(35,77,187,.32); font-size: 12px; font-weight: 800; cursor: pointer; transition: transform var(--ease), box-shadow var(--ease), background var(--ease); }
.quick-contact-toggle:hover { transform: translateY(-2px); box-shadow: 0 16px 34px rgba(35,77,187,.4); }
.quick-contact-toggle > i { font-size: 15px; }
.quick-toggle-close { display: none; }
.quick-contact-toggle.is-open .quick-toggle-open { display: none; }
.quick-contact-toggle.is-open .quick-toggle-close { display: inline-block; }
.quick-contact-menu { width: min(290px, calc(100vw - 32px)); display: grid; gap: 6px; padding: 9px; background: #fff; border: 1px solid #e1e7f0; border-radius: 15px; box-shadow: 0 18px 55px rgba(9,27,56,.2); opacity: 1; visibility: visible; transform: translateY(0) scale(1); transform-origin: bottom right; transition: opacity 180ms ease, visibility 180ms ease, transform 180ms ease; }
.quick-contact-menu[aria-hidden="true"] { opacity: 0; visibility: hidden; pointer-events: none; transform: translateY(10px) scale(.97); }
.quick-contact-link { min-width: 0; display: flex; align-items: center; gap: 11px; padding: 10px; color: var(--ink); background: #fff; border-radius: 10px; transition: background var(--ease), transform var(--ease); }
.quick-contact-link:hover { background: #f3f6fb; transform: translateX(-2px); }
.quick-contact-icon { width: 37px; height: 37px; flex: 0 0 37px; display: grid; place-items: center; color: var(--blue); background: #edf2ff; border-radius: 10px; font-size: 14px; }
.quick-phone .quick-contact-icon { color: #16825f; background: #e9f8f1; }
.quick-zalo .quick-contact-icon { color: #1263d5; background: #eaf2ff; }
.quick-email .quick-contact-icon { color: #8056d8; background: #f2edff; }
.quick-contact-link > span:nth-child(2) { min-width: 0; display: grid; gap: 2px; }
.quick-contact-link strong { color: #1b2c47; font-size: 11px; font-weight: 800; }
.quick-contact-link small { overflow-wrap: anywhere; color: #718099; font-size: 9px; line-height: 1.45; }
.quick-external { margin-left: auto; color: #9aa7b9; font-size: 10px; }

/* Motion-safe scroll reveals */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 500ms ease, transform 500ms ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 1020px) {
  .navbar { gap: 18px; }
  .nav-menu { gap: 16px; }
  .nav-menu > a { font-size: 11px; }
  .hero-grid { gap: 36px; }
  .architecture-card { padding: 17px; }
  .services-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .service-card:last-child { grid-column: auto; }
}

@media (max-width: 860px) {
  .container { width: min(100% - 36px, 620px); }
  .navbar { min-height: 68px; gap: 11px; }
  .brand-mark { width: 38px; height: 38px; }
  .brand-copy strong { font-size: 12px; }
  .brand-copy small { font-size: 9px; }
  .menu-toggle { width: 38px; height: 38px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 5px; order: 3; margin-left: auto; padding: 0; background: transparent; border: 1px solid #e6ebf2; border-radius: 9px; cursor: pointer; }
  .menu-toggle span { width: 15px; height: 2px; display: block; background: #253655; border-radius: 3px; transition: transform var(--ease), opacity var(--ease); }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(7px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-7px) rotate(-45deg); }
  .nav-menu { position: absolute; top: calc(100% + 1px); left: 0; right: 0; display: none; align-items: stretch; gap: 3px; margin: 0; padding: 12px 18px 17px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 18px 24px rgba(15,34,63,.08); }
  .nav-menu.is-open { display: flex; flex-direction: column; }
  .nav-menu > a { padding: 10px 8px; font-size: 12px; }
  .nav-menu .nav-cta { justify-content: space-between; margin-top: 4px; padding: 11px 12px; }
  .language-switch { order: 2; margin-left: auto; }
  .language-option.language-chinese { min-width: 36px; }
  .menu-toggle + .nav-menu { order: 4; }
  .hero-grid { grid-template-columns: 1fr; gap: 5px; min-height: 0; padding-top: 59px; padding-bottom: 36px; }
  .hero-copy { max-width: 650px; }
  .hero h1 { max-width: 620px; margin-top: 20px; font-size: clamp(39px, 10vw, 58px); }
  .hero-lead { max-width: 590px; font-size: 13px; }
  .hero-visual { min-height: 350px; margin-top: 18px; }
  .architecture-card { width: min(440px, calc(100% - 12px)); transform: none; }
  .floating-note { right: 0; bottom: 0; }
  .orbit-one { width: 90%; }
  .orbit-two { width: 75%; }
  .hero-bottom { align-items: flex-start; flex-direction: column; padding-top: 17px; }
  .audience-chips { justify-content: flex-start; }
  .section { padding: 72px 0; }
  .section-heading { margin-bottom: 30px; }
  .section-heading h2, .process-intro h2 { font-size: clamp(28px, 7vw, 37px); }
  .section-heading > p, .process-intro > p { font-size: 11px; }
  .services-grid { gap: 12px; }
  .service-card { min-height: 0; padding: 19px; }
  .expertise-layout, .process-layout, .contact-layout { grid-template-columns: 1fr; gap: 36px; }
  .expertise-copy { max-width: 600px; }
  .expertise-copy h2, .contact-copy h2 { font-size: clamp(30px, 7vw, 40px); }
  .expertise-panel { padding-inline: 17px; }
  .audience-grid { grid-template-columns: 1fr; gap: 12px; }
  .audience-card { padding: 21px; }
  .audience-card p { min-height: 0; }
  .audience-section .section-heading .eyebrow { max-width: 100%; }
  .process-section { padding: 72px 0; }
  .process-layout { gap: 30px; }
  .contact-section { padding: 72px 0; }
  .contact-layout { gap: 28px; }
  .contact-copy { padding-top: 0; }
  .contact-direct { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .contact-direct a { font-size: 10px; overflow-wrap: anywhere; }
  .footer-inner { flex-wrap: wrap; gap: 15px 22px; }
  .footer-inner > p { order: 3; flex-basis: 100%; }
  .quick-contact { right: 16px; bottom: 16px; }
  .quick-contact-toggle { min-height: 46px; padding-inline: 15px; }
  .back-to-top { right: 16px; bottom: 74px; }
}

@media (max-width: 480px) {
  .container { width: calc(100% - 32px); }
  .navbar { gap: 8px; }
  .brand { gap: 8px; }
  .brand-mark { width: 35px; height: 35px; border-radius: 11px; }
  .brand-copy small { font-size: 8px; }
  .language-option { min-width: 29px; padding-inline: 5px; }
  .hero-grid { padding-top: 48px; }
  .hero h1 { font-size: clamp(36px, 10.5vw, 47px); }
  .hero-actions { align-items: stretch; }
  .hero-actions .button { flex: 1 1 auto; }
  .hero-assurance { font-size: 10px; }
  .hero-visual { min-height: 300px; }
  .architecture-card { padding: 14px; }
  .architecture-flow { grid-template-columns: .68fr 28px 1.25fr; gap: 7px; padding-block: 16px; }
  .architecture-node { gap: 7px; padding: 10px 7px; font-size: 8px; }
  .architecture-node i { font-size: 11px; }
  .node-client { padding-inline: 3px; }
  .architecture-footer > span { font-size: 7px; }
  .floating-note { right: 3px; padding: 9px 11px; }
  .note-icon { width: 29px; height: 29px; }
  .services-grid { grid-template-columns: 1fr; }
  .service-card { padding: 20px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .contact-direct { grid-template-columns: 1fr; }
  .contact-form { padding: 19px; }
  .quick-contact { right: 12px; bottom: 12px; }
  .quick-contact-toggle { min-height: 44px; gap: 8px; padding-inline: 13px; border-radius: 13px; font-size: 11px; }
  .back-to-top { right: 12px; bottom: 68px; width: 38px; height: 38px; }
  .footer-inner { align-items: flex-start; }
  .copyright { margin-left: auto; }
}

@media (max-width: 360px) {
  .navbar { gap: 6px; }
  .brand { gap: 6px; }
  .brand-mark { width: 31px; height: 31px; flex-basis: 31px; }
  .brand-copy strong { font-size: 11px; }
  .brand-copy small { display: none; }
  .language-option { min-width: 26px; padding-inline: 3px; }
  .language-option.language-chinese { min-width: 32px; }
  .menu-toggle { width: 34px; flex: 0 0 34px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}