/* ============================================================
   信锐正 SynReagen — Ultrapure DCA Deblock
   Stylesheet: base + 3 themes (A Clinical Blue / B Life Science
   Green / C Ink Navy & Gold) + responsive.
   ============================================================ */

/* ---------- Tokens & themes ---------- */
:root,
[data-theme="a"] {
  --brand: #15569e;
  --brand-ink: #0e2e54;
  --accent: #2f86d4;
  --tint: #eef4fb;
  --tint-2: #e0ebf7;
  --chart-1: #15569e;
  --chart-2: #d6863a;
  --logo-bg: #15569e;
  --logo-fg: #ffffff;
  --on-brand: #ffffff;
  --ring: rgba(21, 86, 158, .28);
  --logo-sq: #1f4e8f;
  --logo-s: #bcd6ef;
  --logo-syn: #16294a;
  --logo-reagen: #2f6fb3;
  --font-display: var(--font-sans);
}

[data-theme="b"] {
  --brand: #3c7d5d;
  --brand-ink: #234f3a;
  --accent: #6cbb47;
  --tint: #eef5f0;
  --tint-2: #dcecdf;
  --chart-1: #3c7d5d;
  --chart-2: #d6863a;
  --logo-bg: #3c7d5d;
  --logo-fg: #ffffff;
  --on-brand: #ffffff;
  --ring: rgba(60, 125, 93, .26);
  --logo-sq: #3c7d5f;
  --logo-s: #aed5bf;
  --logo-syn: #1d4634;
  --logo-reagen: #3f8463;
  --font-display: var(--font-sans);
}

[data-theme="c"] {
  --brand: #16284a;
  --brand-ink: #101d38;
  --accent: #b6914e;
  --tint: #f7f1e6;
  --tint-2: #efe6d3;
  --chart-1: #b6914e;
  --chart-2: #44567a;
  --logo-bg: transparent;
  --logo-fg: #16284a;
  --on-brand: #f6efe1;
  --ring: rgba(182, 145, 78, .32);
  --logo-sq: #16233f;
  --logo-s: #caa86a;
  --logo-syn: #16233f;
  --logo-reagen: #b6914e;
  --font-display: var(--font-serif);
}

:root {
  --text: #1b2430;
  --muted: #5b6878;
  --line: #e5e9ef;
  --bg: #ffffff;
  --card: #ffffff;
  --maxw: 1180px;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(16, 36, 64, .06), 0 4px 14px rgba(16, 36, 64, .05);
  --shadow-md: 0 8px 30px rgba(16, 36, 64, .10);
  --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-serif: 'Playfair Display', 'Noto Serif SC', 'Songti SC', Georgia, serif;
}

/* ---------- Reset / base ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { margin: 0; line-height: 1.2; font-weight: 700; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: var(--brand); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: 999px; font-weight: 600; font-size: 15px;
  cursor: pointer; border: 1.5px solid transparent; transition: transform .15s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--brand); color: var(--on-brand); box-shadow: 0 6px 18px var(--ring); }
.btn-primary:hover { background: var(--brand-ink); }
[data-theme="c"] .btn-primary { color: #f6efe1; }
[data-theme="c"] .btn-primary:hover { background: var(--brand-ink); border-color: var(--accent); }
.btn-ghost { background: transparent; color: var(--brand); border-color: var(--ring); }
.btn-ghost:hover { background: var(--tint); }
.btn-block { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .25s ease;
}
.site-header.scrolled { box-shadow: var(--shadow-sm); }
.header-inner { display: flex; align-items: center; gap: 20px; height: 70px; }

.logo { display: inline-flex; align-items: center; gap: 11px; }
.logo-mark svg { width: 44px; height: 44px; }
.lm-bg { fill: var(--logo-sq); }
.lm-s { fill: none; stroke: var(--logo-s); stroke-width: 6.4; stroke-linecap: round; stroke-linejoin: round; }
.lm-node { fill: var(--logo-s); }
.logo-text { display: flex; flex-direction: column; line-height: 1.04; }
.logo-word { font-family: var(--font-sans); font-weight: 700; font-size: 21px; letter-spacing: -.02em; }
.logo-word .lw-1 { color: var(--logo-syn); }              /* "syn" */
.logo-word .lw-2 { color: var(--logo-reagen); }           /* "reagen" */
.logo-cn { font-size: 10.5px; letter-spacing: .34em; color: #97a0a6; font-weight: 600; margin-top: 2px; }

.main-nav { display: flex; gap: 26px; margin-left: 10px; }
.main-nav a { font-size: 15px; font-weight: 500; color: var(--text); position: relative; padding: 4px 0; }
.main-nav a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px; height: 2px;
  background: var(--accent); transition: right .25s ease;
}
.main-nav a:hover { color: var(--brand); }
.main-nav a:hover::after { right: 0; }

.header-actions { display: flex; align-items: center; gap: 12px; margin-left: auto; }
/* Theme switcher hidden — site locked to B (green). A/C themes kept in code, just not exposed. */
.theme-switch { display: none; gap: 7px; padding: 5px 8px; border: 1px solid var(--line); border-radius: 999px; }
.theme-switch .dot { width: 16px; height: 16px; border-radius: 50%; border: 2px solid transparent; cursor: pointer; padding: 0; transition: transform .15s ease; }
.theme-switch .dot:hover { transform: scale(1.12); }
.dot-a { background: #15569e; }
.dot-b { background: #1f8a5b; }
.dot-c { background: linear-gradient(135deg, #16284a 55%, #b6914e 55%); }
.theme-switch .dot.active { border-color: var(--text); box-shadow: 0 0 0 2px #fff inset; }

.lang-toggle {
  font-family: var(--font-sans); min-width: 42px; height: 36px; padding: 0 12px;
  border: 1px solid var(--line); border-radius: 999px; background: #fff; cursor: pointer;
  font-weight: 700; font-size: 14px; color: var(--brand); transition: background .2s, border-color .2s;
}
.lang-toggle:hover { background: var(--tint); border-color: var(--ring); }
.header-cta { padding: 9px 18px; font-size: 14px; }

.menu-btn { display: none; width: 42px; height: 38px; border: 1px solid var(--line); border-radius: 10px; background: #fff; cursor: pointer; flex-direction: column; gap: 4px; align-items: center; justify-content: center; }
.menu-btn span { display: block; width: 18px; height: 2px; background: var(--text); transition: .25s; }
.menu-btn[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-btn[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; }
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(1100px 520px at 78% -8%, var(--tint-2), transparent 60%),
    linear-gradient(180deg, var(--tint) 0%, #fff 72%);
}
.hero-inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center;
  padding: 72px 24px 64px;
}
.hero-eyebrow { font-size: 12.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--brand); font-weight: 700; margin-bottom: 16px; }
.badge {
  display: inline-block; font-size: 12.5px; font-weight: 700; letter-spacing: .08em;
  color: var(--brand); background: var(--tint); border: 1px solid var(--ring);
  padding: 6px 14px; border-radius: 999px; margin-bottom: 16px;
}
.hero-title {
  font-family: var(--font-display); font-size: clamp(40px, 6vw, 66px); line-height: 1.04;
  letter-spacing: -.01em; color: var(--brand-ink); margin-bottom: 8px; font-weight: 800;
}
[data-theme="c"] .hero-title { font-weight: 700; }
.hero-sub { font-size: clamp(18px, 2.4vw, 24px); color: var(--accent); font-weight: 600; margin-bottom: 20px; }
[data-theme="c"] .hero-sub { font-family: var(--font-serif); font-style: italic; }
.hero-lead { font-size: 17px; color: var(--muted); max-width: 46ch; margin-bottom: 24px; }
.hero-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }
.chip {
  font-size: 13px; font-weight: 600; color: var(--text); background: #fff;
  border: 1px solid var(--line); border-radius: 8px; padding: 7px 13px; box-shadow: var(--shadow-sm);
  font-variant-numeric: tabular-nums;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; }

/* hero structure card */
.struct-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 22px;
  padding: 30px 26px 20px; box-shadow: var(--shadow-md); position: relative;
}
.struct-card::before {
  content: ""; position: absolute; left: 24px; top: 0; width: 56px; height: 4px; border-radius: 0 0 4px 4px; background: var(--accent);
}
.dca-struct { width: 100%; height: auto; margin: 6px auto 4px; }
.dca-struct .bond line { stroke: var(--text); stroke-width: 2.4; stroke-linecap: round; }
.dca-struct .atom text { font-family: var(--font-sans); font-weight: 600; font-size: 24px; fill: var(--text); }
.dca-struct .atom .atom-h { font-size: 17px; fill: var(--muted); }
.struct-cap { text-align: center; font-size: 13px; color: var(--muted); margin-top: 6px; }

/* ---------- Stat band ---------- */
.stat-band { background: var(--brand-ink); color: var(--on-brand); }
[data-theme="c"] .stat-band { background: var(--brand); }
.stat-inner { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; padding: 40px 24px; }
.stat { position: relative; padding-left: 4px; }
.stat::before { content: ""; display: block; width: 40px; height: 4px; border-radius: 3px; background: var(--accent); margin-bottom: 16px; }
.stat-val { font-family: var(--font-display); font-size: clamp(38px, 5.4vw, 58px); font-weight: 800; line-height: 1; letter-spacing: -.01em; display: flex; align-items: baseline; }
[data-theme="c"] .stat-val { font-weight: 700; }
.stat-val .op { font-size: .62em; font-weight: 600; margin-right: 4px; opacity: .92; }
.stat-val .unit { font-size: .42em; font-weight: 600; margin-left: 4px; opacity: .9; }
.stat-label { font-size: 16px; font-weight: 600; margin-top: 14px; }
.stat-sub { font-size: 11.5px; letter-spacing: .1em; text-transform: uppercase; opacity: .62; margin-top: 4px; }

/* ---------- Sections ---------- */
.section { padding: 80px 0; }
.section-tint { background: var(--tint); }
.section-head { margin-bottom: 40px; max-width: 760px; }
.eyebrow { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); margin-bottom: 10px; position: relative; padding-left: 16px; }
.eyebrow::before { content: ""; position: absolute; left: 0; top: 50%; width: 9px; height: 9px; border-radius: 2px; background: var(--accent); transform: translateY(-50%); }
.section-title { font-family: var(--font-display); font-size: clamp(26px, 3.4vw, 38px); color: var(--brand-ink); font-weight: 800; letter-spacing: -.005em; }
[data-theme="c"] .section-title { font-weight: 700; }
.section-lead { margin-top: 14px; font-size: 16.5px; color: var(--muted); }

/* ---------- Overview ---------- */
.overview-grid { display: grid; grid-template-columns: 1.6fr 1fr; gap: 48px; align-items: start; }
.overview-body { font-size: 17.5px; color: var(--text); line-height: 1.85; }
.overview-points { display: grid; gap: 14px; }
.overview-points li { display: flex; align-items: flex-start; gap: 12px; font-weight: 600; color: var(--text); }
.tick { flex: none; width: 22px; height: 22px; border-radius: 50%; background: var(--tint-2); position: relative; margin-top: 1px; }
.tick::after { content: ""; position: absolute; left: 7px; top: 4px; width: 6px; height: 10px; border: solid var(--brand); border-width: 0 2.4px 2.4px 0; transform: rotate(45deg); }

/* ---------- Technology / Why purity ---------- */
.tech-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: stretch; }
.tech-body { font-size: 17px; color: var(--text); line-height: 1.85; }
.tech-body b { color: var(--brand); }
.mech { margin-top: 26px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm); }
.mech-title { font-size: 13px; font-weight: 700; letter-spacing: .04em; color: var(--muted); margin-bottom: 16px; }
.mech-row { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; }
.mech-step { background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; text-align: center; min-width: 96px; }
.mech-formula { display: block; font-weight: 700; color: var(--text); font-size: 16px; }
.mech-label { display: block; font-size: 11.5px; color: var(--muted); margin-top: 3px; }
.mech-by { background: #fff5ea; border-color: #f0d4ad; }
[data-theme="c"] .mech-by { background: var(--tint); border-color: var(--ring); }
.mech-by .mech-formula { color: #c87a25; }
[data-theme="c"] .mech-by .mech-formula { color: var(--accent); }
.mech-arrow { display: flex; flex-direction: column; align-items: center; min-width: 60px; }
.mech-reagent { font-size: 12px; font-weight: 700; color: var(--brand); }
.mech-arrow svg { width: 56px; height: 18px; }
.mech-arrow svg line { stroke: var(--accent); stroke-width: 2.2; }
.mech-arrow svg polygon { fill: var(--accent); }
.mech-reagent-sub { font-size: 10.5px; color: var(--muted); }
.mech-plus { font-size: 20px; color: var(--muted); font-weight: 600; }
.mech-note { font-size: 13.5px; color: var(--muted); margin-top: 16px; line-height: 1.6; }

/* chart */
.chart-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm); display: flex; flex-direction: column; }
.chart-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 6px; }
.chart-title { font-size: 15.5px; font-weight: 700; color: var(--text); }
.chart-note { font-size: 12px; color: var(--muted); }
.chart { width: 100%; height: auto; }
.chart .grid line { stroke: var(--line); stroke-width: 1; stroke-dasharray: 3 4; }
.chart .axis-x { stroke: var(--muted); stroke-width: 1.4; }
.chart .axis-label-x text, .chart .axis-label-y text { font-size: 12px; fill: var(--muted); }
.chart .axis-label-x text { text-anchor: middle; }
.chart .axis-label-y text { text-anchor: end; }
.chart .axis-caption { font-size: 12px; fill: var(--muted); text-anchor: middle; }
.chart .series-area { fill: var(--chart-1); opacity: .10; }
.chart .series-1 { fill: none; stroke: var(--chart-1); stroke-width: 3; stroke-linecap: round; }
.chart .series-2 { fill: none; stroke: var(--chart-2); stroke-width: 2.6; stroke-dasharray: 7 6; stroke-linecap: round; }
.chart .pt-1 { fill: var(--chart-1); }
.chart .pt-2 { fill: var(--chart-2); }
.chart-legend { display: flex; gap: 20px; margin-top: 12px; flex-wrap: wrap; }
.chart-legend .lg { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }
.chart-legend .lg i { width: 20px; height: 3px; border-radius: 2px; }
.chart-legend .lg-1 i { background: var(--chart-1); }
.chart-legend .lg-2 i { background: var(--chart-2); }

/* ---------- Advantages ---------- */
.adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.adv-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px; box-shadow: var(--shadow-sm); transition: transform .2s ease, box-shadow .2s ease, border-color .2s; position: relative; overflow: hidden; }
.adv-card::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--accent); transform: scaleY(0); transform-origin: top; transition: transform .25s ease; }
.adv-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--ring); }
.adv-card:hover::before { transform: scaleY(1); }
.adv-num { font-family: var(--font-display); font-size: 28px; font-weight: 800; color: var(--tint-2); display: block; margin-bottom: 8px; }
[data-theme="c"] .adv-num { color: var(--accent); opacity: .55; }
.adv-card h3 { font-size: 18px; color: var(--brand-ink); margin-bottom: 8px; }
.adv-card p { font-size: 14.5px; color: var(--muted); }

/* ---------- Applications ---------- */
.apps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.app-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 22px; box-shadow: var(--shadow-sm); transition: transform .2s ease, box-shadow .2s ease; }
.app-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.app-ico { width: 56px; height: 56px; border-radius: 14px; background: var(--tint); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.app-ico svg { width: 32px; height: 32px; fill: none; stroke: var(--brand); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.app-tag { display: inline-block; font-size: 11.5px; font-weight: 700; letter-spacing: .06em; color: var(--brand); background: var(--tint); padding: 3px 10px; border-radius: 999px; margin-bottom: 10px; }
.app-card h3 { font-size: 17px; color: var(--brand-ink); margin-bottom: 8px; }
.app-card p { font-size: 14px; color: var(--muted); }

/* ---------- Specifications ---------- */
.specs-grid { display: grid; grid-template-columns: 1.7fr 1fr; gap: 32px; align-items: start; }
.specs-table-wrap { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.specs-table { width: 100%; border-collapse: collapse; }
.specs-table th { background: var(--brand-ink); color: var(--on-brand); text-align: left; font-size: 13.5px; letter-spacing: .03em; padding: 15px 22px; font-weight: 700; }
[data-theme="c"] .specs-table th { background: var(--brand); color: #f6efe1; }
.specs-table td { padding: 14px 22px; border-top: 1px solid var(--line); font-size: 15px; vertical-align: top; }
.specs-table td:first-child { font-weight: 600; color: var(--text); width: 52%; }
.specs-table td:last-child { color: var(--muted); }
.specs-table tbody tr:nth-child(even) { background: var(--tint); }
.specs-table tr.row-hl td:last-child { color: var(--brand); font-weight: 700; }
.specs-facts { background: var(--brand-ink); color: var(--on-brand); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow-md); }
[data-theme="c"] .specs-facts { background: var(--brand); }
.specs-facts dl { margin: 0 0 20px; display: grid; gap: 16px; }
.specs-facts dl > div { display: flex; flex-direction: column; gap: 3px; border-bottom: 1px solid rgba(255,255,255,.14); padding-bottom: 14px; }
.specs-facts dl > div:last-child { border-bottom: none; padding-bottom: 0; }
.specs-facts dt { font-size: 12px; letter-spacing: .04em; opacity: .68; text-transform: uppercase; }
.specs-facts dd { margin: 0; font-size: 16px; font-weight: 600; }
.specs-facts .btn-primary { background: #fff; color: var(--brand); }
.specs-facts .btn-primary:hover { background: var(--tint); }
[data-theme="c"] .specs-facts .btn-primary { background: var(--accent); color: #fff; }

/* ---------- Packaging & quality ---------- */
.pack-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.pack-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px; box-shadow: var(--shadow-sm); }
.pack-ico { width: 54px; height: 54px; border-radius: 14px; background: var(--tint); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.pack-ico svg { width: 30px; height: 30px; fill: none; stroke: var(--brand); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.pack-card h3 { font-size: 16.5px; color: var(--brand-ink); margin-bottom: 8px; }
.pack-card p { font-size: 14px; color: var(--muted); }
.safety-note { display: flex; align-items: flex-start; gap: 12px; margin-top: 28px; background: #fff8ee; border: 1px solid #f0dcb8; border-radius: 12px; padding: 16px 18px; font-size: 14px; color: #7a5a23; }
[data-theme="c"] .safety-note { background: var(--tint); border-color: var(--ring); color: var(--brand-ink); }
.safety-ico { flex: none; width: 22px; height: 22px; border-radius: 50%; background: #e8a33d; color: #fff; font-weight: 800; display: flex; align-items: center; justify-content: center; font-size: 14px; }
[data-theme="c"] .safety-ico { background: var(--accent); }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: center; }
.about-body { font-size: 17px; color: var(--text); line-height: 1.85; margin-top: 18px; }
.placeholder-note { margin-top: 14px; font-size: 13px; color: var(--muted); background: var(--tint); border: 1px dashed var(--ring); border-radius: 8px; padding: 8px 12px; display: inline-block; }
.about-badges { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.about-badge { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; box-shadow: var(--shadow-sm); border-left: 4px solid var(--accent); }
.about-badge strong { display: block; font-size: 16px; color: var(--brand-ink); margin-bottom: 4px; }
.about-badge span { font-size: 13.5px; color: var(--muted); }

/* ---------- Contact ---------- */
.section-contact { background: var(--tint); }
.contact-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 32px; align-items: start; }
.inquiry-form { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow-sm); display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field-full { grid-column: 1 / -1; }
.field label { font-size: 13.5px; font-weight: 600; color: var(--text); }
.field label em { color: #d4542f; font-style: normal; }
.field input, .field select, .field textarea {
  font-family: var(--font-sans); font-size: 15px; color: var(--text);
  border: 1px solid var(--line); border-radius: 10px; padding: 11px 13px; background: #fff;
  transition: border-color .2s, box-shadow .2s; width: 100%;
}
.field textarea { resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px var(--ring); }
.field input.invalid, .field select.invalid { border-color: #d4542f; box-shadow: 0 0 0 3px rgba(212,84,47,.16); }
.form-foot { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.form-msg { font-size: 14px; font-weight: 600; }
.form-msg.ok { color: var(--brand); }
.form-msg.err { color: #d4542f; }

.contact-info { background: var(--brand-ink); color: var(--on-brand); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow-md); }
[data-theme="c"] .contact-info { background: var(--brand); }
.contact-info h3 { font-size: 18px; margin-bottom: 18px; }
.contact-info ul { display: grid; gap: 18px; }
.contact-info li { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; align-items: start; }
.ci-ico { grid-row: span 2; width: 36px; height: 36px; border-radius: 10px; background: rgba(255,255,255,.12); display: flex; align-items: center; justify-content: center; font-size: 16px; }
.ci-l { font-size: 12px; opacity: .66; text-transform: uppercase; letter-spacing: .06em; }
.ci-v { font-size: 15px; font-weight: 600; }
.contact-info .placeholder-note { margin-top: 22px; background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.25); color: rgba(255,255,255,.8); }

/* ---------- Footer ---------- */
.site-footer { background: var(--brand-ink); color: rgba(255,255,255,.8); padding: 56px 0 28px; }
[data-theme="c"] .site-footer { background: var(--brand-ink); }
.footer-inner { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 36px; padding-bottom: 36px; border-bottom: 1px solid rgba(255,255,255,.12); }
.footer-brand .lm-bg { fill: var(--logo-s); }
.footer-brand .lm-s { stroke: var(--logo-sq); }
.footer-brand .lm-node { fill: var(--logo-sq); }
.footer-brand .logo-word .lw-1 { color: #fff; }
.footer-brand .logo-word .lw-2 { color: var(--logo-s); }
.footer-brand .logo-cn { color: rgba(255,255,255,.55); }
.footer-tagline { margin-top: 14px; font-size: 14px; max-width: 36ch; color: rgba(255,255,255,.62); }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col h4 { font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: rgba(255,255,255,.5); margin-bottom: 4px; font-weight: 700; }
.footer-col a, .footer-col span { font-size: 14.5px; color: rgba(255,255,255,.82); }
.footer-col a:hover { color: #fff; }
.footer-bottom { padding-top: 24px; display: grid; gap: 8px; }
.footer-bottom p { font-size: 12.5px; color: rgba(255,255,255,.55); line-height: 1.6; }
.footer-rights { font-weight: 600; color: rgba(255,255,255,.7) !important; }
.footer-placeholder { font-style: italic; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 36px; padding-top: 52px; }
  .hero-visual { max-width: 420px; }
  .overview-grid, .tech-grid, .specs-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .adv-grid, .pack-grid { grid-template-columns: repeat(2, 1fr); }
  .apps-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  .main-nav {
    position: fixed; inset: 70px 0 auto 0; flex-direction: column; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line); padding: 8px 24px 18px;
    transform: translateY(-130%); transition: transform .3s ease; box-shadow: var(--shadow-md); margin: 0;
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav a { padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 16px; }
  .main-nav a::after { display: none; }
  .menu-btn { display: flex; }
  .header-cta { display: none; }
  .theme-switch { padding: 4px 6px; }
  .section { padding: 60px 0; }
  .stat-inner { grid-template-columns: 1fr; gap: 28px; }
  .stat { display: flex; flex-direction: column; }
  .inquiry-form { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .container { padding: 0 18px; }
  .adv-grid, .pack-grid, .apps-grid { grid-template-columns: 1fr; }
  .about-badges { grid-template-columns: 1fr; }
  .logo-en { display: none; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation: none !important; }
}