/* =========================================================
   MUWEN License Studio · Product website
   Static marketing page. No application logic.
   ========================================================= */
:root {
  --bg: #070b14;
  --bg-2: #0a1020;
  --bg-3: #0d1528;
  --card: #0f182b;
  --card-2: #111d34;
  --border: rgba(120, 150, 200, .14);
  --border-strong: rgba(120, 160, 220, .24);
  --text: #edf3ff;
  --muted: #9aabc5;
  --dim: #667895;
  --accent: #5b8cff;
  --cyan: #22d3ee;
  --green: #34d399;
  --amber: #fbbf24;
  --grad: linear-gradient(135deg, #5b8cff 0%, #22d3ee 100%);
  --grad-soft: linear-gradient(135deg, rgba(91, 140, 255, .14), rgba(34, 211, 238, .05));
  --font: "Microsoft YaHei UI", "PingFang SC", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(1000px 600px at 80% -10%, rgba(34, 211, 238, .09), transparent 65%),
    radial-gradient(1000px 700px at 0% 30%, rgba(91, 140, 255, .08), transparent 65%),
    var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
::selection { background: rgba(91, 140, 255, .35); }

* { scrollbar-width: thin; scrollbar-color: #26385a transparent; }
*::-webkit-scrollbar { width: 8px; height: 8px; }
*::-webkit-scrollbar-thumb { background: #26385a; border-radius: 8px; }

.svg-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.icon { width: 18px; height: 18px; fill: currentColor; flex: 0 0 auto; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 28px; }
.section { padding: 104px 0; position: relative; }
.section-alt {
  background:
    linear-gradient(180deg, rgba(11, 18, 34, .82), rgba(8, 13, 24, .92)),
    var(--bg);
  border-top: 1px solid rgba(120, 150, 200, .07);
  border-bottom: 1px solid rgba(120, 150, 200, .07);
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  color: #7dd3e8; font-size: 10px; font-weight: 700;
  letter-spacing: .20em; text-transform: uppercase; margin-bottom: 16px;
}
.eyebrow-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 0 4px rgba(34, 211, 238, .10); }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(40px, 4.8vw, 62px); line-height: 1.14; letter-spacing: -.04em; margin-bottom: 24px; font-weight: 800; }
h2 { font-size: clamp(28px, 3vw, 40px); line-height: 1.22; letter-spacing: -.025em; margin-bottom: 0; font-weight: 800; }
h3 { font-size: 16px; line-height: 1.4; margin-bottom: 8px; font-weight: 700; }
.text-gradient { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ========================= Header ========================= */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(7, 11, 20, .76);
  border-bottom: 1px solid rgba(120, 150, 200, .08);
  backdrop-filter: blur(18px);
}
.header-inner { height: 72px; display: flex; align-items: center; gap: 20px; position: relative; }
.brand { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.brand-logo { width: 34px; height: 34px; border-radius: 9px; box-shadow: 0 8px 24px rgba(34, 211, 238, .16); }
.brand-name { font-size: 14px; font-weight: 800; letter-spacing: .08em; }
.brand-sub { color: var(--dim); font-size: 9.5px; letter-spacing: .12em; border-left: 1px solid var(--border-strong); padding-left: 10px; margin-left: 2px; }
.main-nav { margin-left: auto; display: flex; align-items: center; gap: 28px; }
.main-nav a { color: var(--muted); font-size: 12.5px; transition: color .18s ease; }
.main-nav a:hover { color: var(--text); }
.main-nav .nav-cta {
  display: inline-flex; align-items: center; gap: 7px;
  color: #fff; background: rgba(91, 140, 255, .12);
  border: 1px solid rgba(91, 140, 255, .32);
  border-radius: 8px; padding: 9px 14px; font-size: 12px; font-weight: 600;
}
.main-nav .nav-cta:hover { background: rgba(91, 140, 255, .20); border-color: rgba(91, 140, 255, .50); }
.main-nav .nav-cta .icon { width: 14px; height: 14px; }
.nav-toggle { display: none; }
.nav-toggle-label { display: none; }

/* ========================= Hero ========================= */
.hero { position: relative; overflow: hidden; padding: 92px 0 84px; }
.hero-glow {
  position: absolute; inset: -20% -10% auto 40%; height: 760px;
  background: radial-gradient(closest-side, rgba(34, 211, 238, .15), transparent 70%);
  filter: blur(10px); pointer-events: none;
}
.hero-grid-bg {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(120, 160, 220, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 160, 220, .055) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,.7), transparent 78%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0,0,0,.7), transparent 78%);
  pointer-events: none;
}
.hero-inner { position: relative; display: grid; grid-template-columns: 1.02fr .98fr; gap: 54px; align-items: center; }
.hero-copy { position: relative; z-index: 2; }
.hero-lead { color: var(--muted); font-size: 16px; line-height: 1.9; max-width: 560px; margin-bottom: 32px; }
.nowrap { white-space: nowrap; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 28px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 46px; padding: 0 20px; border-radius: 9px;
  font-size: 13px; font-weight: 700; border: 1px solid transparent;
  transition: transform .16s ease, filter .16s ease, background .16s ease, border-color .16s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { color: #fff; background: var(--grad); box-shadow: 0 14px 34px rgba(59, 130, 246, .24); }
.btn-primary:hover { filter: brightness(1.06); }
.btn-ghost { color: var(--muted); background: rgba(15, 24, 43, .72); border-color: var(--border-strong); }
.btn-ghost:hover { color: var(--text); background: rgba(17, 29, 52, .9); border-color: rgba(120, 160, 220, .38); }
.btn .icon { width: 16px; height: 16px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 18px; color: var(--dim); font-size: 11.5px; }
.hero-meta span { display: inline-flex; align-items: center; gap: 6px; }
.hero-meta .icon { width: 13px; height: 13px; color: #72c7dd; }

.hero-visual { position: relative; min-height: 520px; display: flex; align-items: center; justify-content: center; }
.visual-aura {
  position: absolute; inset: 5% -8% 0 -8%;
  background: radial-gradient(closest-side, rgba(91, 140, 255, .26), transparent 70%);
  filter: blur(18px); pointer-events: none;
}
.window-card {
  position: relative; z-index: 2; width: 100%; max-width: 620px;
  border: 1px solid rgba(150, 180, 230, .22);
  border-radius: 15px; overflow: hidden;
  background: #0a1222;
  box-shadow: 0 40px 100px rgba(0, 0, 0, .55), 0 0 0 1px rgba(255, 255, 255, .02) inset;
  transform: perspective(1500px) rotateY(-5deg) rotateX(2deg);
  animation: windowIn .9s cubic-bezier(.2, .8, .2, 1) both;
}
.window-bar {
  height: 34px; display: flex; align-items: center; gap: 5px; padding: 0 12px;
  background: #08101d; border-bottom: 1px solid rgba(120, 150, 200, .10);
}
.win-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.win-dot.red { background: #ff5f57; } .win-dot.amber { background: #febc2e; } .win-dot.green { background: #28c840; }
.window-title { margin-left: 8px; color: #6d809e; font-size: 9px; letter-spacing: .04em; }
.window-card img { width: 100%; height: auto; opacity: .96; }
.float-card {
  position: absolute; z-index: 3; display: flex; align-items: center; gap: 9px;
  background: rgba(15, 25, 44, .92); border: 1px solid var(--border-strong);
  border-radius: 11px; padding: 10px 12px; box-shadow: 0 18px 44px rgba(0, 0, 0, .35);
  backdrop-filter: blur(12px); animation: floatCard 6s ease-in-out infinite;
}
.float-card strong { display: block; font-size: 10.5px; line-height: 1.4; }
.float-card span { display: block; color: var(--dim); font-size: 9px; line-height: 1.4; }
.float-icon { width: 28px; height: 28px; border-radius: 8px; display: inline-flex; align-items: center; justify-content: center; flex: 0 0 auto; }
.float-icon.success { color: var(--green); background: rgba(52, 211, 153, .09); }
.float-icon.cyan { color: var(--cyan); background: rgba(34, 211, 238, .09); }
.float-icon.amber { color: var(--amber); background: rgba(251, 191, 36, .09); }
.float-icon .icon { width: 15px; height: 15px; }
.float-sign { top: 6%; right: -4%; }
.float-bind { bottom: 18%; left: -8%; animation-delay: -2s; }
.float-key { bottom: -2%; right: 6%; animation-delay: -4s; }

@keyframes windowIn { from { opacity: 0; transform: perspective(1500px) rotateY(-10deg) rotateX(4deg) translateY(18px); } to { opacity: 1; transform: perspective(1500px) rotateY(-5deg) rotateX(2deg) translateY(0); } }
@keyframes floatCard { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

/* ========================= Trust ========================= */
.trust-strip { border-top: 1px solid rgba(120, 150, 200, .08); border-bottom: 1px solid rgba(120, 150, 200, .08); background: rgba(8, 13, 24, .7); }
.trust-inner { min-height: 66px; display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.trust-label { color: #7e91ae; font-size: 10px; letter-spacing: .14em; font-weight: 700; text-transform: uppercase; margin-right: 8px; }
.trust-item { color: #9bacc7; font-size: 11.5px; }
.trust-dot { width: 3px; height: 3px; border-radius: 50%; background: #354866; }

/* ========================= Section heading ========================= */
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 40px; margin-bottom: 44px; }
.section-head > div { max-width: 760px; }
.section-head > p { max-width: 390px; color: var(--muted); font-size: 13px; line-height: 1.8; margin: 0 0 4px; }
.section-lead { color: var(--muted); font-size: 14.5px; line-height: 1.9; margin: 20px 0 0; }

/* ========================= Features ========================= */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.feature-card {
  padding: 24px; border-radius: 13px;
  background: linear-gradient(180deg, rgba(17, 29, 52, .72), rgba(13, 21, 38, .72));
  border: 1px solid var(--border);
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
}
.feature-card:hover { transform: translateY(-3px); border-color: rgba(91, 140, 255, .30); background: linear-gradient(180deg, rgba(20, 34, 61, .85), rgba(14, 24, 43, .85)); }
.feature-icon {
  width: 38px; height: 38px; border-radius: 10px; display: inline-flex; align-items: center; justify-content: center;
  color: var(--cyan); background: rgba(34, 211, 238, .07); border: 1px solid rgba(34, 211, 238, .12);
  margin-bottom: 18px;
}
.feature-icon .icon { width: 19px; height: 19px; }
.feature-card h3 { font-size: 15px; margin-bottom: 7px; }
.feature-card p { margin: 0; color: var(--muted); font-size: 11.5px; line-height: 1.8; }

.stat-strip {
  margin-top: 20px; display: grid; grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border); border-radius: 13px; overflow: hidden;
  background: rgba(10, 16, 30, .6);
}
.stat { padding: 22px 20px; border-right: 1px solid var(--border); }
.stat:last-child { border-right: 0; }
.stat strong { display: block; font-size: 28px; line-height: 1.1; letter-spacing: -.02em; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { display: block; color: var(--dim); font-size: 10.5px; margin-top: 5px; }

/* ========================= Workflow ========================= */
.workflow { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.workflow-line { position: absolute; top: 33px; left: 10%; right: 10%; height: 1px; background: linear-gradient(90deg, transparent, rgba(91, 140, 255, .5), rgba(34, 211, 238, .5), transparent); }
.workflow-step { position: relative; padding: 0 8px; }
.workflow-num { color: #4f6688; font-family: var(--mono); font-size: 10px; letter-spacing: .12em; margin-bottom: 14px; }
.workflow-icon {
  width: 48px; height: 48px; border-radius: 13px; display: flex; align-items: center; justify-content: center;
  color: var(--cyan); background: #0e1a2e; border: 1px solid rgba(91, 140, 255, .22);
  position: relative; z-index: 2; margin-bottom: 18px;
}
.workflow-icon .icon { width: 22px; height: 22px; }
.workflow-step h3 { font-size: 14px; }
.workflow-step p { color: var(--muted); font-size: 11.5px; line-height: 1.8; margin: 0; }
.role-strip { margin-top: 46px; display: flex; align-items: stretch; gap: 14px; }
.role-card { flex: 1; padding: 20px 22px; border: 1px solid var(--border); border-radius: 12px; background: rgba(12, 20, 36, .58); }
.role-tag { display: inline-block; color: var(--cyan); font-size: 9px; letter-spacing: .12em; border: 1px solid rgba(34, 211, 238, .18); background: rgba(34, 211, 238, .06); padding: 2px 7px; border-radius: 5px; margin-bottom: 8px; }
.role-card strong { display: block; font-size: 13px; }
.role-card p { color: var(--dim); font-size: 10.5px; line-height: 1.7; margin: 4px 0 0; }
.role-arrow { display: flex; align-items: center; color: #3d5476; }
.role-arrow .icon { width: 20px; height: 20px; }

/* ========================= Security ========================= */
.security-inner { display: grid; grid-template-columns: 1fr 1.04fr; gap: 70px; align-items: center; }
.security-copy h2 { margin-bottom: 18px; }
.check-list { list-style: none; margin: 26px 0 0; padding: 0; display: flex; flex-direction: column; gap: 13px; }
.check-list li { display: flex; gap: 9px; color: var(--muted); font-size: 12.5px; line-height: 1.75; }
.check-list .icon { width: 15px; height: 15px; color: var(--green); margin-top: 4px; }
.check-list strong { color: #cfdcf0; font-weight: 600; }
.security-note { margin-top: 26px; display: flex; gap: 9px; padding: 13px 14px; border-left: 2px solid rgba(251, 191, 36, .55); background: rgba(251, 191, 36, .04); }
.security-note .icon { width: 15px; height: 15px; color: var(--amber); margin-top: 3px; }
.security-note p { margin: 0; color: #a9a07c; font-size: 10.5px; line-height: 1.7; }
.security-diagram { position: relative; display: grid; grid-template-columns: 1fr 50px 1fr; grid-template-rows: auto auto; gap: 14px; align-items: center; }
.diagram-card { padding: 20px; border: 1px solid var(--border); border-radius: 13px; background: linear-gradient(160deg, #111d34, #0c1526); }
.diagram-card.issuer { border-color: rgba(91, 140, 255, .28); box-shadow: 0 20px 60px rgba(41, 80, 160, .14); }
.diagram-head { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 10px; margin-bottom: 13px; }
.diagram-icon { width: 26px; height: 26px; border-radius: 7px; background: #162744; display: inline-flex; align-items: center; justify-content: center; color: var(--cyan); }
.diagram-icon .icon { width: 14px; height: 14px; }
.diagram-card strong { display: block; font-family: var(--mono); font-size: 11.5px; margin-bottom: 5px; }
.diagram-card p { color: var(--dim); font-size: 10px; margin: 0 0 12px; }
.diagram-chip { display: inline-block; color: var(--green); background: rgba(52, 211, 153, .06); border: 1px solid rgba(52, 211, 153, .14); border-radius: 5px; padding: 2px 7px; font-size: 9px; }
.diagram-card.issuer .diagram-chip { color: var(--accent); background: rgba(91, 140, 255, .08); border-color: rgba(91, 140, 255, .18); }
.diagram-arrow { display: flex; flex-direction: column; align-items: center; gap: 5px; color: #516886; font-size: 8px; letter-spacing: .08em; }
.diagram-arrow .icon { width: 17px; height: 17px; }
.diagram-code { grid-column: 1 / -1; padding: 16px 18px; border: 1px solid var(--border); border-radius: 11px; background: rgba(8, 14, 26, .8); }
.diagram-code-title { color: #657b9d; font-size: 9px; letter-spacing: .12em; text-transform: uppercase; margin-bottom: 9px; }
.payload-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 5px 0; border-bottom: 1px dashed rgba(120, 150, 200, .09); font-size: 10px; color: var(--dim); }
.payload-row:last-child { border-bottom: 0; }
.payload-row b { color: #a8c2e2; font-family: var(--mono); font-weight: 500; }

/* ========================= Gallery ========================= */
.gallery { display: grid; grid-template-columns: 1.35fr 1fr; grid-template-rows: auto auto; gap: 14px; }
.gallery figure { margin: 0; border: 1px solid var(--border); border-radius: 13px; overflow: hidden; background: #0a1222; }
.gallery-main { grid-row: span 2; }
.gallery a { display: block; position: relative; }
.gallery img { width: 100%; height: 100%; object-fit: cover; object-position: top left; transition: transform .4s ease, filter .4s ease; }
.gallery figure:not(.gallery-main) img { height: 220px; }
.gallery-main img { min-height: 454px; }
.gallery a:hover img { transform: scale(1.015); filter: brightness(1.06); }
.gallery figcaption { display: flex; align-items: center; gap: 9px; padding: 12px 14px; border-top: 1px solid var(--border); color: var(--muted); font-size: 10.5px; background: rgba(10, 17, 31, .9); }
.gallery figcaption span { color: var(--cyan); font-family: var(--mono); font-size: 9px; letter-spacing: .08em; }

/* ========================= Developers ========================= */
.developer-inner { display: grid; grid-template-columns: .92fr 1.08fr; gap: 64px; align-items: center; }
.dev-points { display: grid; grid-template-columns: 1fr; gap: 12px; margin: 28px 0; }
.dev-points > div { display: flex; align-items: baseline; gap: 12px; padding-bottom: 11px; border-bottom: 1px solid rgba(120, 150, 200, .10); }
.dev-points strong { flex: 0 0 140px; color: #d5e2f5; font-size: 12px; }
.dev-points span { color: var(--dim); font-size: 10.5px; }
.code-window { border: 1px solid var(--border-strong); border-radius: 14px; overflow: hidden; background: #070d18; box-shadow: 0 28px 80px rgba(0, 0, 0, .35); }
.code-bar { height: 36px; display: flex; align-items: center; gap: 5px; padding: 0 13px; background: #0a111e; border-bottom: 1px solid var(--border); }
.code-bar span:last-child { margin-left: 8px; color: #657b9d; font-family: var(--mono); font-size: 9px; }
.code-window pre { margin: 0; padding: 24px 22px; overflow: auto; color: #c6d8ef; font-family: var(--mono); font-size: 12px; line-height: 1.9; }
.c-key { color: #8fb4ff; } .c-num { color: #f4b46a; }
.code-foot { display: flex; justify-content: space-between; gap: 12px; padding: 11px 16px; border-top: 1px solid var(--border); color: #506784; font-family: var(--mono); font-size: 8.5px; letter-spacing: .04em; }

/* ========================= Use cases ========================= */
.use-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.use-card { padding: 24px 20px; border: 1px solid var(--border); border-radius: 12px; background: rgba(13, 22, 39, .66); }
.use-icon { width: 36px; height: 36px; border-radius: 10px; display: inline-flex; align-items: center; justify-content: center; color: var(--cyan); background: rgba(34, 211, 238, .07); margin-bottom: 16px; }
.use-icon .icon { width: 18px; height: 18px; }
.use-card h3 { font-size: 14px; }
.use-card p { color: var(--dim); font-size: 10.5px; line-height: 1.8; margin: 0; }

/* ========================= FAQ ========================= */
.faq-inner { display: grid; grid-template-columns: 300px 1fr; gap: 70px; align-items: start; }
.faq-intro { position: sticky; top: 100px; }
.faq-intro p { color: var(--muted); font-size: 12.5px; line-height: 1.8; margin-top: 16px; }
.faq-list { display: flex; flex-direction: column; gap: 9px; }
.faq-item { border: 1px solid var(--border); border-radius: 11px; background: rgba(13, 22, 39, .62); padding: 0 18px; }
.faq-item summary { list-style: none; cursor: pointer; padding: 15px 0; color: #d4e1f3; font-size: 12.5px; font-weight: 600; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; color: var(--cyan); font-family: var(--mono); font-size: 16px; font-weight: 400; }
.faq-item[open] summary::after { content: "−"; }
.faq-item p { margin: 0 0 16px; color: var(--muted); font-size: 11.5px; line-height: 1.85; max-width: 680px; }

/* ========================= Contact ========================= */
.contact-section { padding: 40px 0 100px; }
.contact-card {
  position: relative; overflow: hidden;
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 30px; align-items: center;
  padding: 58px 58px;
  border: 1px solid rgba(120, 170, 240, .25); border-radius: 20px;
  background:
    radial-gradient(700px 400px at 85% 20%, rgba(34, 211, 238, .14), transparent 65%),
    linear-gradient(130deg, #16284a 0%, #0d1830 55%, #0b1424 100%);
  box-shadow: 0 40px 100px rgba(0, 0, 0, .35);
}
.contact-glow { position: absolute; width: 460px; height: 460px; right: -80px; bottom: -220px; background: radial-gradient(closest-side, rgba(91, 140, 255, .22), transparent 70%); }
.contact-copy { position: relative; z-index: 2; }
.contact-copy h2 { margin-bottom: 16px; }
.contact-copy > p { color: var(--muted); font-size: 13px; line-height: 1.9; max-width: 520px; }
.contact-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.contact-note { color: #607590 !important; font-size: 10px !important; margin-top: 20px !important; }
.contact-art { position: relative; min-height: 260px; z-index: 2; display: flex; align-items: center; justify-content: center; }
.contact-ring { position: absolute; border-radius: 50%; border: 1px solid rgba(120, 180, 240, .15); }
.ring-1 { width: 230px; height: 230px; }
.ring-2 { width: 300px; height: 300px; border-style: dashed; opacity: .6; }
.contact-shield {
  width: 96px; height: 96px; border-radius: 28px; display: flex; align-items: center; justify-content: center;
  color: #b9f2fb; background: linear-gradient(145deg, rgba(91, 140, 255, .35), rgba(34, 211, 238, .18));
  border: 1px solid rgba(160, 230, 255, .35);
  box-shadow: 0 20px 50px rgba(34, 211, 238, .18);
}
.contact-shield .icon { width: 48px; height: 48px; }
.contact-chip { position: absolute; padding: 8px 11px; border-radius: 9px; background: rgba(9, 17, 32, .85); border: 1px solid rgba(120, 160, 220, .24); color: #7f9dc0; font-size: 8px; line-height: 1.4; text-align: center; letter-spacing: .04em; }
.contact-chip b { color: #c9e9f5; font-size: 10px; font-weight: 600; }
.c1 { top: 12px; right: 10px; } .c2 { bottom: 18px; left: 0; } .c3 { bottom: 36px; right: 4px; }

/* ========================= Footer ========================= */
.site-footer { border-top: 1px solid rgba(120, 150, 200, .09); background: #060a12; padding: 34px 0; }
.footer-inner { display: flex; align-items: center; gap: 34px; flex-wrap: wrap; }
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-logo { width: 28px; height: 28px; border-radius: 8px; }
.footer-brand strong { display: block; font-size: 11.5px; }
.footer-brand span { display: block; color: var(--dim); font-size: 9px; margin-top: 1px; }
.footer-links { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.footer-links a { color: var(--dim); font-size: 10px; }
.footer-links a:hover { color: var(--muted); }
.footer-meta { margin-left: auto; text-align: right; color: #40536e; font-size: 9px; }
.footer-meta span { display: block; line-height: 1.8; }

/* ========================= Responsive ========================= */
@media (max-width: 1080px) {
  .hero-inner { gap: 34px; }
  .hero-visual { min-height: 450px; }
  .float-bind { left: -2%; }
  .float-sign { right: 0; }
  .security-inner, .developer-inner { gap: 42px; }
  .faq-inner { grid-template-columns: 250px 1fr; gap: 40px; }
  .contact-card { padding: 44px; }
}

@media (max-width: 900px) {
  .section { padding: 80px 0; }
  .nav-toggle-label { display: inline-flex; margin-left: auto; align-items: center; justify-content: center; width: 38px; height: 38px; color: var(--muted); cursor: pointer; border: 1px solid var(--border); border-radius: 8px; }
  .nav-toggle-label .icon { width: 19px; height: 19px; }
  .nav-toggle-label .icon-close { display: none; }
  .nav-toggle:checked ~ .nav-toggle-label .icon-menu { display: none; }
  .nav-toggle:checked ~ .nav-toggle-label .icon-close { display: block; }
  .main-nav {
    position: absolute; top: 64px; left: 20px; right: 20px;
    display: none; flex-direction: column; align-items: stretch; gap: 4px;
    padding: 10px; background: rgba(9, 15, 27, .98);
    border: 1px solid var(--border-strong); border-radius: 12px;
    box-shadow: 0 24px 70px rgba(0, 0, 0, .55);
  }
  .nav-toggle:checked ~ .main-nav { display: flex; }
  .main-nav a { padding: 10px 12px; border-radius: 7px; font-size: 12px; }
  .main-nav a:hover { background: rgba(91, 140, 255, .08); }
  .main-nav .nav-cta { justify-content: center; margin-top: 4px; }
  .hero { padding: 64px 0 40px; }
  .hero-inner { grid-template-columns: 1fr; gap: 50px; }
  .hero-copy { max-width: 680px; }
  .hero-visual { min-height: 430px; width: 100%; max-width: 660px; margin: 0 auto; }
  .window-card { transform: none; animation: none; }
  .float-sign { right: 2%; }
  .float-bind { left: 0; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .workflow { grid-template-columns: 1fr 1fr; gap: 32px 20px; }
  .workflow-line { display: none; }
  .security-inner, .developer-inner { grid-template-columns: 1fr; gap: 44px; }
  .security-diagram { order: 2; }
  .gallery { grid-template-columns: 1fr; grid-template-rows: none; }
  .gallery-main { grid-row: auto; }
  .gallery-main img { min-height: 0; }
  .gallery figure:not(.gallery-main) img { height: auto; }
  .use-grid { grid-template-columns: 1fr 1fr; }
  .faq-inner { grid-template-columns: 1fr; gap: 28px; }
  .faq-intro { position: static; }
  .contact-card { grid-template-columns: 1fr; padding: 40px 32px; }
  .contact-art { display: none; }
  .footer-inner { gap: 20px; }
  .footer-meta { margin-left: 0; text-align: left; width: 100%; }
}

@media (max-width: 640px) {
  .container { padding: 0 18px; }
  .section { padding: 64px 0; }
  .header-inner { height: 64px; }
  .brand-sub { display: none; }
  h1 { font-size: clamp(34px, 10vw, 44px); }
  h2 { font-size: clamp(27px, 7vw, 34px); }
  .hero { padding: 48px 0 32px; }
  .hero-lead { font-size: 14px; }
  .hero-meta { gap: 12px; }
  .hero-visual { min-height: 300px; }
  .window-card { border-radius: 11px; }
  .float-card { padding: 8px 9px; }
  .float-card strong { font-size: 9px; }
  .float-card span { font-size: 8px; }
  .float-icon { width: 24px; height: 24px; }
  .float-sign { top: 4%; right: 0; }
  .float-bind { bottom: 10%; left: 0; }
  .float-key { display: none; }
  .trust-inner { gap: 12px; padding: 14px 18px; }
  .trust-label { width: 100%; margin: 0; }
  .trust-dot { display: none; }
  .section-head { display: block; margin-bottom: 30px; }
  .section-head > p { margin-top: 14px; }
  .feature-grid { grid-template-columns: 1fr; gap: 10px; }
  .feature-card { padding: 19px; }
  .stat-strip { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(1), .stat:nth-child(2) { border-bottom: 1px solid var(--border); }
  .workflow { grid-template-columns: 1fr; gap: 26px; }
  .workflow-step { display: grid; grid-template-columns: 42px 1fr; column-gap: 14px; }
  .workflow-num { grid-column: 1 / -1; margin-bottom: 0; }
  .workflow-icon { grid-row: 2 / span 2; width: 42px; height: 42px; margin: 0; }
  .workflow-step h3 { grid-column: 2; margin: 0; }
  .workflow-step p { grid-column: 2; }
  .role-strip { flex-direction: column; }
  .role-arrow { display: none; }
  .check-list li { font-size: 11.5px; }
  .security-diagram { grid-template-columns: 1fr; }
  .diagram-arrow { flex-direction: row; justify-content: center; }
  .diagram-arrow .icon { transform: rotate(90deg); }
  .diagram-code { grid-column: auto; }
  .use-grid { grid-template-columns: 1fr; }
  .dev-points strong { flex-basis: 125px; }
  .code-window pre { font-size: 10px; padding: 18px 14px; }
  .contact-section { padding: 10px 0 70px; }
  .contact-card { padding: 32px 22px; border-radius: 15px; }
  .contact-actions .btn { width: 100%; }
  .faq-item { padding: 0 14px; }
  .footer-links { gap: 12px; }
  .footer-meta { font-size: 8.5px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}