/* ============================================================
   T-Data Technology — Design System
   Dark tech theme: deep navy + energy green
   ============================================================ */

:root {
  --bg: #0a1628;
  --bg-soft: #0d1c33;
  --card: #10203a;
  --card-hover: #14284a;
  --line: rgba(148, 197, 255, 0.14);
  --line-strong: rgba(148, 197, 255, 0.28);

  --green: #22d3a5;
  --green-soft: rgba(34, 211, 165, 0.12);
  --cyan: #38bdf8;
  --cyan-soft: rgba(56, 189, 248, 0.12);

  --text: #e8f1fb;
  --text-dim: #9fb3cc;
  --text-faint: #64789a;

  --radius: 14px;
  --radius-lg: 22px;
  --maxw: 1180px;
  --header-h: 72px;

  --font-latin: "Inter", "Noto Sans Thai", -apple-system, "Segoe UI", sans-serif;
  --font-thai: "Noto Sans Thai", "Inter", -apple-system, sans-serif;
  --font-zh: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans Thai", sans-serif;
}

html[lang="th"] { font-family: var(--font-thai); line-height: 1.75; }
html[lang="en"] { font-family: var(--font-latin); line-height: 1.65; }
html[lang="zh"] { font-family: var(--font-zh); line-height: 1.75; }

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

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

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--header-h);
  background: rgba(10, 22, 40, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center; gap: 28px;
}
.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-img { height: 52px; width: auto; mix-blend-mode: screen; }
.logo-text { display: flex; flex-direction: column; line-height: 1.1; }
.logo-text b { font-size: 19px; letter-spacing: 0.06em; color: #fff; }
.logo-text b .accent { color: var(--green); }
.logo-text span { font-size: 10.5px; letter-spacing: 0.22em; color: var(--text-faint); text-transform: uppercase; }

.main-nav { margin-left: auto; }
.main-nav ul { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  display: block; padding: 9px 13px; border-radius: 9px;
  font-size: 14.5px; color: var(--text-dim); transition: 0.2s;
}
.main-nav a:hover { color: #fff; background: rgba(255, 255, 255, 0.05); }
.main-nav a.active { color: var(--green); background: var(--green-soft); }
.main-nav a.nav-cta {
  color: #06281e; background: var(--green); font-weight: 600; margin-left: 8px;
}
.main-nav a.nav-cta:hover { background: #3ce0b6; color: #06281e; }

.lang-switch {
  flex-shrink: 0; position: relative;
}
.lang-switch select {
  appearance: none; -webkit-appearance: none;
  background: transparent; color: var(--text-dim);
  border: 1px solid var(--line-strong); border-radius: 9px;
  padding: 7px 28px 7px 12px; font-size: 12.5px; font-family: inherit;
  min-width: 96px; text-overflow: ellipsis;
  cursor: pointer; transition: 0.2s; white-space: nowrap;
}
.lang-switch select:hover { color: #fff; border-color: var(--cyan); }
.lang-switch select:focus { outline: none; border-color: var(--cyan); color: var(--cyan); }
.lang-switch select option { background: var(--card); color: var(--text); }
.lang-switch::after {
  content: ""; position: absolute; right: 11px; top: 50%;
  width: 7px; height: 7px; pointer-events: none;
  border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor;
  transform: translateY(-70%) rotate(45deg); opacity: 0.7;
}

.nav-toggle {
  display: none; margin-left: auto; background: none; border: 1px solid var(--line-strong);
  border-radius: 9px; width: 42px; height: 38px; cursor: pointer; position: relative;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 10px; width: 20px; height: 2px;
  background: var(--text); transition: 0.25s;
}
.nav-toggle span { top: 18px; }
.nav-toggle span::before { top: -6px; left: 0; }
.nav-toggle span::after { top: 6px; left: 0; }
body.nav-open .nav-toggle span { background: transparent; }
body.nav-open .nav-toggle span::before { top: 0; transform: rotate(45deg); }
body.nav-open .nav-toggle span::after { top: 0; transform: rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative; padding: calc(var(--header-h) + 90px) 0 100px;
  overflow: hidden; text-align: center;
  background: url("../img/hero-bg.jpg") center 30% / cover no-repeat;
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(180deg,
    rgba(10, 22, 40, 0.62) 0%,
    rgba(10, 22, 40, 0.5) 45%,
    rgba(10, 22, 40, 0.78) 82%,
    #0a1628 100%);
}
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(700px 380px at 18% 8%, rgba(34, 211, 165, 0.13), transparent 65%),
    radial-gradient(760px 420px at 85% 20%, rgba(56, 189, 248, 0.12), transparent 65%),
    radial-gradient(900px 500px at 50% 115%, rgba(34, 211, 165, 0.08), transparent 70%);
}
.hero-grid {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: 0.5;
  background-image:
    linear-gradient(rgba(148, 197, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 197, 255, 0.05) 1px, transparent 1px);
  background-size: 52px 52px;
  mask-image: radial-gradient(ellipse 75% 65% at 50% 35%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 75% 65% at 50% 35%, #000 30%, transparent 75%);
}
.hero .container { position: relative; z-index: 1; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--green); background: var(--green-soft);
  border: 1px solid rgba(34, 211, 165, 0.3); border-radius: 999px;
  padding: 7px 16px; margin-bottom: 26px;
}
.eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px var(--green); }

.hero h1 {
  font-size: clamp(34px, 5.4vw, 60px); font-weight: 800; line-height: 1.16;
  letter-spacing: -0.01em; max-width: 900px; margin: 0 auto 22px;
}
.hero h1 .grad {
  background: linear-gradient(92deg, var(--green) 10%, var(--cyan) 90%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .lead {
  font-size: clamp(16px, 2vw, 19px); color: var(--text-dim);
  max-width: 720px; margin: 0 auto 38px;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- Page hero (subpages) ---------- */
.page-hero {
  position: relative; padding: calc(var(--header-h) + 64px) 0 58px;
  text-align: center; overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.page-hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(620px 300px at 22% 0%, rgba(34, 211, 165, 0.11), transparent 65%),
    radial-gradient(620px 320px at 80% 10%, rgba(56, 189, 248, 0.1), transparent 65%);
}
.page-hero .container { position: relative; }
.page-hero h1 { font-size: clamp(30px, 4.2vw, 46px); font-weight: 800; margin-bottom: 14px; }
.page-hero .lead { color: var(--text-dim); font-size: 17px; max-width: 760px; margin: 0 auto; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 30px; border-radius: 12px; font-size: 15.5px; font-weight: 600;
  transition: 0.22s; cursor: pointer; border: 1px solid transparent;
}
.btn-primary { background: var(--green); color: #06281e; }
.btn-primary:hover { background: #3ce0b6; transform: translateY(-2px); box-shadow: 0 10px 30px rgba(34, 211, 165, 0.28); }
.btn-ghost { border-color: var(--line-strong); color: var(--text); }
.btn-ghost:hover { border-color: var(--green); color: var(--green); background: var(--green-soft); }

/* ---------- Sections ---------- */
.section { padding: 92px 0; }
.section.alt { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { text-align: center; max-width: 780px; margin: 0 auto 56px; }
.section-head .kicker {
  font-size: 13px; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--green); margin-bottom: 14px; display: block;
}
.section-head h2 { font-size: clamp(26px, 3.6vw, 38px); font-weight: 800; line-height: 1.25; margin-bottom: 16px; }
.section-head p { color: var(--text-dim); font-size: 16.5px; }

/* ---------- Cards / Grids ---------- */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 30px 28px; transition: 0.25s; position: relative; overflow: hidden;
}
.card:hover { border-color: var(--line-strong); background: var(--card-hover); transform: translateY(-4px); }
.card .icon {
  width: 52px; height: 52px; margin-bottom: 20px; font-size: 0;
  background: none; overflow: hidden; flex-shrink: 0;
}
.card .icon img { width: 52px; height: 52px; border-radius: 13px; display: block; }
.card h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.card p { color: var(--text-dim); font-size: 14.5px; }
.card .num {
  font-size: 13px; font-weight: 700; color: var(--cyan); letter-spacing: 0.1em; margin-bottom: 12px; display: block;
}

/* Scenario cards */
.scenario-card { padding: 0; }
.scenario-card .scene-img {
  width: 100%; height: 150px; object-fit: cover; display: block;
  transition: transform 0.4s ease;
}
.scenario-card:hover .scene-img { transform: scale(1.06); }
.scenario-card h3 { margin: 20px 24px 0; }
.scenario-card p { margin: 10px 24px 0; }
.scenario-card .metric {
  margin: 18px 24px 26px; padding-top: 16px; border-top: 1px dashed var(--line-strong);
  display: flex; align-items: baseline; gap: 8px;
}
.scenario-card .metric b { font-size: 26px; font-weight: 800; color: var(--green); white-space: nowrap; flex-shrink: 0; }
.scenario-card .metric span { font-size: 13px; color: var(--text-dim); }

/* ---------- Stats band ---------- */
.stats-band {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px;
  background: linear-gradient(160deg, rgba(34, 211, 165, 0.07), rgba(56, 189, 248, 0.06));
  border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 44px 36px;
}
.stat { text-align: center; }
.stat b { font-size: clamp(30px, 4vw, 44px); font-weight: 800; color: var(--green); display: block; line-height: 1.1; }
.stat b .unit { font-size: 0.55em; color: var(--cyan); }
.stat span { display: block; margin-top: 8px; color: var(--text-dim); font-size: 14px; }

/* ---------- Pain points ---------- */
.pain-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 26px; }
.pain-item {
  display: flex; gap: 11px; align-items: flex-start; font-size: 14.5px; color: var(--text-dim);
  padding: 10px 0; border-bottom: 1px dashed var(--line);
}
.pain-item::before {
  content: "✕"; flex-shrink: 0; width: 21px; height: 21px; border-radius: 6px;
  background: rgba(248, 113, 113, 0.12); color: #f87171; font-size: 11px; font-weight: 700;
  display: flex; align-items: center; justify-content: center; margin-top: 2px;
}
.fix-item { display: flex; gap: 11px; align-items: flex-start; font-size: 14.5px; color: var(--text-dim); padding: 10px 0; }
.fix-item::before {
  content: "✓"; flex-shrink: 0; width: 21px; height: 21px; border-radius: 6px;
  background: var(--green-soft); color: var(--green); font-size: 12px; font-weight: 800;
  display: flex; align-items: center; justify-content: center; margin-top: 2px;
}

/* ---------- Split layout (text + visual) ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split.rev .split-visual { order: -1; }
.split h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; margin-bottom: 18px; }
.split p { color: var(--text-dim); margin-bottom: 16px; }
.split-visual {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 28px;
}

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-lg); }
table.compare { width: 100%; border-collapse: collapse; min-width: 640px; }
table.compare th, table.compare td { padding: 16px 20px; text-align: left; font-size: 14.5px; border-bottom: 1px solid var(--line); }
table.compare thead th { background: var(--bg-soft); color: var(--text); font-weight: 700; font-size: 14px; }
table.compare tbody td { color: var(--text-dim); }
table.compare tbody tr:last-child td { border-bottom: none; }
table.compare td.good, table.compare td.good b { color: var(--green); }
table.compare tbody tr:hover td { background: rgba(255, 255, 255, 0.02); }

/* ---------- Timeline ---------- */
.timeline { position: relative; max-width: 860px; margin: 0 auto; }
.timeline::before {
  content: ""; position: absolute; left: 27px; top: 8px; bottom: 8px; width: 2px;
  background: linear-gradient(var(--green), var(--cyan));
}
.tl-item { position: relative; padding: 0 0 34px 78px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item .dot {
  position: absolute; left: 14px; top: 0; width: 28px; height: 28px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--green); color: var(--green);
  display: flex; align-items: center; justify-content: center; font-size: 12.5px; font-weight: 800;
}
.tl-item h3 { font-size: 17.5px; font-weight: 700; margin-bottom: 6px; }
.tl-item p { color: var(--text-dim); font-size: 14.5px; }
.tl-item .when { font-size: 12.5px; color: var(--cyan); font-weight: 600; letter-spacing: 0.06em; }

/* ---------- Diagram (SVG) ---------- */
.diagram {
  background: linear-gradient(170deg, #0e1e38, #0b1830);
  border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 30px;
}
.diagram svg { width: 100%; height: auto; }
.diagram .caption { text-align: center; color: var(--text-faint); font-size: 13px; margin-top: 16px; }

/* ---------- Steps / process ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; counter-reset: step; }
.step { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 28px; position: relative; }
.step::before {
  counter-increment: step; content: "0" counter(step);
  font-size: 15px; font-weight: 800; color: var(--green); letter-spacing: 0.08em;
  display: block; margin-bottom: 14px;
}
.step h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.step p { color: var(--text-dim); font-size: 14.5px; }

/* ---------- Case cards ---------- */
.case-card { display: flex; flex-direction: column; gap: 14px; }
.case-card .tag {
  align-self: flex-start; font-size: 12px; font-weight: 600; letter-spacing: 0.06em;
  color: var(--cyan); background: var(--cyan-soft); border-radius: 999px; padding: 5px 12px;
}
.case-card .big { font-size: 34px; font-weight: 800; color: var(--green); line-height: 1; }
.case-card .big small { font-size: 15px; color: var(--cyan); font-weight: 600; }

/* ---------- Feature highlight ---------- */
.badge-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.badge {
  font-size: 13px; color: var(--text-dim); border: 1px solid var(--line-strong);
  border-radius: 999px; padding: 7px 15px; display: inline-flex; align-items: center; gap: 7px;
}
.badge::before { content: "✓"; color: var(--green); font-weight: 800; }

/* ---------- CTA band ---------- */
.cta-band {
  text-align: center; padding: 66px 40px; border-radius: var(--radius-lg);
  background:
    radial-gradient(500px 240px at 20% 0%, rgba(34, 211, 165, 0.16), transparent 65%),
    radial-gradient(500px 240px at 80% 100%, rgba(56, 189, 248, 0.14), transparent 65%),
    var(--card);
  border: 1px solid var(--line-strong);
}
.cta-band h2 { font-size: clamp(24px, 3.4vw, 36px); font-weight: 800; margin-bottom: 14px; }
.cta-band p { color: var(--text-dim); margin-bottom: 30px; }

/* ---------- Forms ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-grid .full { grid-column: 1 / -1; }
.field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--text); }
.field label .req { color: var(--green); }
.field input, .field select, .field textarea {
  width: 100%; background: var(--bg-soft); border: 1px solid var(--line-strong);
  border-radius: 11px; padding: 13px 15px; color: var(--text); font-size: 15px;
  font-family: inherit; transition: 0.2s; outline: none;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--green); box-shadow: 0 0 0 3px rgba(34, 211, 165, 0.14);
}
.field textarea { min-height: 130px; resize: vertical; }
.form-note { font-size: 13px; color: var(--text-faint); margin-top: 14px; }
.form-success {
  display: none; text-align: center; padding: 40px 20px;
  background: var(--green-soft); border: 1px solid rgba(34, 211, 165, 0.35); border-radius: var(--radius-lg);
}
.form-success.show { display: block; }
.form-success .icon { font-size: 40px; margin-bottom: 12px; }
.field .err { display: none; color: #f87171; font-size: 12.5px; margin-top: 6px; }
.field.invalid input, .field.invalid textarea, .field.invalid select { border-color: #f87171; }
.field.invalid .err { display: block; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); background: #081220; padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.4fr; gap: 40px; margin-bottom: 44px; }
.footer-grid h4 { font-size: 14px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: #fff; margin-bottom: 16px; }
.footer-grid ul li { margin-bottom: 10px; }
.footer-grid ul a { color: var(--text-dim); font-size: 14px; transition: 0.2s; }
.footer-grid ul a:hover { color: var(--green); }
.footer-about p { color: var(--text-dim); font-size: 14px; margin: 14px 0 0; max-width: 300px; }
.footer-contact li { color: var(--text-dim); font-size: 14px; display: flex; gap: 10px; margin-bottom: 12px; }
.footer-contact .ico { color: var(--green); flex-shrink: 0; }
.footer-contact .ico img { width: 18px; height: 18px; border-radius: 5px; display: block; margin-top: 1px; }
.solution-fig {
  border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--line);
  margin-bottom: 20px; background: var(--card);
}
.solution-fig img { width: 100%; height: auto; display: block; }
/* 场景图片作为整个场景区块的背景（左深右浅，保证文字可读） */
.scene-bg {
  background-image:
    linear-gradient(90deg, rgba(10, 22, 40, .93) 0%, rgba(10, 22, 40, .84) 48%, rgba(10, 22, 40, .58) 100%),
    var(--scene-img);
  background-size: cover;
  background-position: center;
}
#hotel.scene-bg     { --scene-img: url("../img/scenarios/hotel.jpg"); }
#fnb.scene-bg       { --scene-img: url("../img/scenarios/fnb.jpg"); }
#mall.scene-bg      { --scene-img: url("../img/scenarios/mall.jpg"); }
#office.scene-bg    { --scene-img: url("../img/scenarios/office.jpg"); }
#parking.scene-bg   { --scene-img: url("../img/scenarios/parking.jpg"); }
#education.scene-bg { --scene-img: url("../img/scenarios/education.jpg"); }
/* 图文反转的场景（卡片在左、文字在右）：渐变方向也反转，深色一侧始终垫在文字下 */
#fnb.scene-bg, #office.scene-bg, #education.scene-bg {
  background-image:
    linear-gradient(270deg, rgba(10, 22, 40, .93) 0%, rgba(10, 22, 40, .84) 48%, rgba(10, 22, 40, .58) 100%),
    var(--scene-img);
}
.footer-bottom {
  border-top: 1px solid var(--line); padding-top: 24px;
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  color: var(--text-faint); font-size: 13px;
}

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .stats-band { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; gap: 36px; }
  .split.rev .split-visual { order: 0; }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .nav-toggle { display: block; }
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0; margin: 0;
    background: rgba(8, 18, 32, 0.98); border-bottom: 1px solid var(--line);
    padding: 14px 24px 22px; display: none;
  }
  body.nav-open .main-nav { display: block; }
  .main-nav ul { flex-direction: column; align-items: stretch; gap: 2px; }
  .main-nav a { padding: 13px 12px; font-size: 16px; }
  .main-nav a.nav-cta { margin: 10px 0 0; text-align: center; }
  .lang-switch { margin-left: -12px; }
  .grid-2, .grid-3, .grid-4, .steps, .pain-grid, .form-grid { grid-template-columns: 1fr; }
  .stats-band { grid-template-columns: repeat(2, 1fr); padding: 30px 20px; gap: 26px 10px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .hero { padding: calc(var(--header-h) + 60px) 0 70px; }
}