/* ============================================================
   DTNS HTTP Proxy — project site
   dark technical theme · no external dependencies
   ============================================================ */

:root {
  --bg: #05080d;
  --bg-2: #070d16;
  --panel: #0a1420;
  --panel-2: #0c1826;
  --line: rgba(126, 170, 210, 0.14);
  --line-strong: rgba(126, 170, 210, 0.28);
  --text: #e9f0f8;
  --muted: #8fa3ba;
  --dim: #63768c;
  --mint: #42e8b4;
  --mint-deep: #1bbf8f;
  --blue: #6cb6ff;
  --amber: #ffbf69;
  --red: #ff8791;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --r: 18px;
  --wrap: 1160px;
  --nav-h: 72px;
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  background: var(--bg);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: transparent;
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: rgba(66, 232, 180, 0.26); color: #fff; }

a { color: inherit; }

img, svg { max-width: 100%; }

code, pre, kbd { font-family: var(--mono); }

code {
  font-size: 0.88em;
  color: #b9f5e2;
  background: rgba(66, 232, 180, 0.07);
  border: 1px solid rgba(66, 232, 180, 0.1);
  border-radius: 5px;
  padding: 1px 5px;
}

:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 300;
  padding: 9px 16px;
  border-radius: 7px;
  background: var(--mint);
  color: #04130d;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 12px; }

/* ---------- background ---------- */

.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(900px 500px at 78% -10%, rgba(108, 182, 255, 0.07), transparent 65%),
    radial-gradient(800px 480px at 12% 2%, rgba(66, 232, 180, 0.08), transparent 62%),
    linear-gradient(180deg, #05080d 0%, #05080d 70%, #060b13 100%);
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(126, 170, 210, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(126, 170, 210, 0.055) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(ellipse 90% 55% at 50% 0%, #000 0%, transparent 78%);
  mask-image: radial-gradient(ellipse 90% 55% at 50% 0%, #000 0%, transparent 78%);
}

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
}
.glow-a {
  width: 480px;
  height: 480px;
  top: -180px;
  left: 8%;
  background: radial-gradient(circle, rgba(66, 232, 180, 0.16), transparent 70%);
}
.glow-b {
  width: 520px;
  height: 520px;
  top: -60px;
  right: -80px;
  background: radial-gradient(circle, rgba(108, 182, 255, 0.13), transparent 70%);
}

/* ---------- layout helpers ---------- */

.wrap {
  width: min(var(--wrap), calc(100% - 56px));
  margin-inline: auto;
}

.section {
  padding-top: 118px;
  scroll-margin-top: calc(var(--nav-h) + 20px);
}

.eyebrow {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mint);
}

.section-head {
  max-width: 760px;
  margin-bottom: 46px;
}

.section-head h2 {
  margin: 0 0 18px;
  font-size: clamp(1.9rem, 3.4vw, 2.85rem);
  line-height: 1.16;
  letter-spacing: -0.025em;
  font-weight: 700;
}

.section-head > p:last-child {
  margin: 0;
  max-width: 66ch;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.85;
}

/* ---------- nav ---------- */

.nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 120;
  background: rgba(5, 8, 13, 0.62);
  -webkit-backdrop-filter: blur(16px) saturate(120%);
  backdrop-filter: blur(16px) saturate(120%);
  border-bottom: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease;
}
.nav.scrolled {
  background: rgba(5, 8, 13, 0.86);
  border-bottom-color: var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: var(--nav-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  flex: none;
}
.brand-mark {
  width: 29px;
  height: 29px;
  color: var(--mint);
  filter: drop-shadow(0 0 12px rgba(66, 232, 180, 0.25));
}
.brand-text {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.13em;
}
.brand-sub {
  color: var(--dim);
  font-weight: 500;
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
}
.nav-links a {
  position: relative;
  color: var(--muted);
  font-size: 13.5px;
  text-decoration: none;
  transition: color 0.2s ease;
}
.nav-links a:hover { color: var(--text); }
.nav-links a.active { color: var(--text); }
.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -7px;
  height: 2px;
  border-radius: 2px;
  background: var(--mint);
  box-shadow: 0 0 10px rgba(66, 232, 180, 0.6);
}
.nav-links .nav-cta {
  padding: 8px 16px;
  border: 1px solid rgba(66, 232, 180, 0.32);
  border-radius: 999px;
  background: rgba(66, 232, 180, 0.07);
  color: var(--mint);
  font-size: 13px;
  transition: background 0.2s ease, border-color 0.2s ease;
}
.nav-links .nav-cta:hover {
  background: rgba(66, 232, 180, 0.14);
  border-color: rgba(66, 232, 180, 0.55);
}
.nav-links .nav-cta.active::after { display: none; }

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.02);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 16px;
  height: 1.5px;
  margin: 5px auto;
  background: var(--text);
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav.open .nav-toggle span:first-child { transform: translateY(3.25px) rotate(45deg); }
.nav.open .nav-toggle span:last-child { transform: translateY(-3.25px) rotate(-45deg); }

/* ---------- hero ---------- */

.hero {
  display: grid;
  grid-template-columns: 1.06fr 0.94fr;
  align-items: center;
  gap: 56px;
  padding-top: 152px;
  padding-bottom: 8px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  padding: 7px 13px;
  border: 1px solid rgba(66, 232, 180, 0.2);
  border-radius: 999px;
  background: rgba(66, 232, 180, 0.055);
  color: #9fe9d1;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.dot {
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 0 rgba(66, 232, 180, 0.55);
  animation: pulse 2.4s ease-out infinite;
}

h1 {
  margin: 24px 0 0;
  font-size: clamp(2.5rem, 5.1vw, 4.15rem);
  line-height: 1.1;
  letter-spacing: -0.035em;
  font-weight: 700;
}

.grad {
  background: linear-gradient(100deg, var(--mint) 8%, #8ff0d7 46%, var(--blue) 96%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.lede {
  margin: 24px 0 0;
  max-width: 37em;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.9;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 10px;
  font-size: 14.5px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.btn svg { width: 17px; height: 17px; }
.btn-primary {
  background: var(--mint);
  color: #03130d;
  box-shadow: 0 10px 34px -12px rgba(66, 232, 180, 0.75);
}
.btn-primary:hover {
  transform: translateY(-1px);
  background: #5cf0c2;
  box-shadow: 0 14px 40px -12px rgba(66, 232, 180, 0.9);
}
.btn-ghost {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text);
}
.btn-ghost:hover {
  border-color: rgba(126, 170, 210, 0.5);
  background: rgba(255, 255, 255, 0.04);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 38px 0 0;
  padding: 0;
  list-style: none;
  font-size: 12.5px;
  color: var(--dim);
}
.hero-meta li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 20px;
  border-left: 1px solid var(--line);
}
.hero-meta li:first-child { padding-left: 0; border-left: 0; }
.hero-meta span {
  color: #c7d6e5;
  font-family: var(--mono);
  font-size: 11.5px;
}

/* ---------- terminal ---------- */

.hero-visual {
  position: relative;
  padding: 14px 0;
}

.term {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  background: linear-gradient(165deg, #0a1522 0%, #060b13 62%);
  box-shadow:
    0 44px 110px -38px rgba(0, 0, 0, 0.95),
    0 0 0 1px rgba(255, 255, 255, 0.02) inset,
    0 1px 0 rgba(255, 255, 255, 0.05) inset;
}

.term-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.018);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--dim);
}
.dots { display: inline-flex; gap: 6px; }
.dots i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #ff6b6b;
  opacity: 0.75;
}
.dots i:nth-child(2) { background: #ffd166; }
.dots i:nth-child(3) { background: #4ade80; }
.term-title { margin-left: 4px; letter-spacing: 0.04em; }
.term-pill {
  margin-left: auto;
  padding: 2px 8px;
  border: 1px solid rgba(66, 232, 180, 0.3);
  border-radius: 4px;
  color: var(--mint);
  font-size: 9.5px;
  letter-spacing: 0.12em;
}

.term-body {
  min-height: 220px;
  padding: 20px 20px 10px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 2.05;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.term-line {
  display: block;
  opacity: 0;
  transform: translateY(4px);
  animation: lineIn 0.26s ease forwards;
}
.tl-cmd { color: #dfe9f4; }
.tl-cmd::before { content: "$ "; color: var(--mint); }
.tl-info { color: #8fc7ff; }
.tl-ok { color: var(--mint); }
.tl-dim { color: #73879d; }
.tl-warn { color: var(--amber); }
.caret {
  display: inline-block;
  width: 7px;
  height: 13px;
  margin-left: 2px;
  vertical-align: -2px;
  background: var(--mint);
  animation: blink 1.1s steps(1) infinite;
}

.term-foot {
  display: flex;
  gap: 18px;
  padding: 11px 16px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 10px;
  color: var(--dim);
}
.live {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--mint);
}
.live i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 8px rgba(66, 232, 180, 0.8);
  animation: blink 2.2s ease-in-out infinite;
}

.float-chip {
  position: absolute;
  z-index: 2;
  padding: 6px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: #0b1622;
  box-shadow: 0 14px 34px -12px rgba(0, 0, 0, 0.9);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: #b9c9db;
  animation: float 6.5s ease-in-out infinite;
}
.chip-a { top: 4px; right: -16px; }
.chip-b { bottom: 10px; left: -24px; animation-delay: -3.2s; color: #9fe9d1; }

/* ---------- stats ---------- */

.stats-wrap { margin-top: 64px; }

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.stat {
  padding: 24px 26px;
  border-left: 1px solid var(--line);
}
.stat:first-child { border-left: 0; }
.stat dt {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.stat dd {
  display: flex;
  align-items: baseline;
  gap: 5px;
  margin: 6px 0 0;
  font-family: var(--mono);
}
.stat-num {
  color: var(--text);
  font-size: 1.9rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.stat-unit { color: var(--mint); font-size: 12px; }

/* ---------- cards ---------- */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.card {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(14, 25, 39, 0.72), rgba(9, 16, 26, 0.72));
  padding: 28px;
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}
.card:hover {
  transform: translateY(-3px);
  border-color: rgba(66, 232, 180, 0.28);
  background: linear-gradient(180deg, rgba(16, 30, 45, 0.85), rgba(9, 17, 27, 0.85));
}

.card h3 {
  margin: 0 0 10px;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}
.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.num-card {
  display: flex;
  flex-direction: column;
  min-height: 214px;
}
.card-index {
  color: rgba(66, 232, 180, 0.45);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}
.num-card h3 { margin-top: 16px; }

.tag {
  display: inline-flex;
  align-self: flex-start;
  margin-top: auto;
  padding: 4px 8px;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

/* ---------- architecture ---------- */

.arch-panel {
  position: relative;
  overflow: hidden;
  padding: 34px 26px 22px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background:
    radial-gradient(ellipse 60% 80% at 50% -10%, rgba(66, 232, 180, 0.06), transparent 70%),
    linear-gradient(180deg, rgba(12, 22, 35, 0.9), rgba(7, 13, 22, 0.9));
}

.arch-flow {
  display: grid;
  grid-template-columns:
    minmax(0, 1fr) 62px minmax(0, 1fr) 72px minmax(0, 1.06fr) 84px minmax(0, 1fr) 62px minmax(0, 1fr);
  align-items: center;
}

.arch-node {
  position: relative;
  min-height: 148px;
  padding: 20px 8px 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(8, 16, 27, 0.72);
  text-align: center;
  transition: border-color 0.25s ease, background 0.25s ease;
}
.arch-node:hover { border-color: var(--line-strong); background: rgba(11, 22, 35, 0.85); }
.node-server { border-color: rgba(66, 232, 180, 0.24); }
.node-client { border-color: rgba(108, 182, 255, 0.22); }

.node-zone {
  position: absolute;
  top: 7px;
  left: 7px;
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.12em;
}
.node-icon {
  width: 30px;
  height: 30px;
  margin: 5px auto 10px;
  color: #cfe3f5;
}
.node-server .node-icon { color: var(--mint); }
.node-client .node-icon { color: var(--blue); }
.arch-node h3 { margin: 0 0 4px; font-size: 13px; letter-spacing: 0; }
.arch-node p {
  margin: 0;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 9.5px;
  line-height: 1.55;
}

.arch-link {
  position: relative;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.arch-link .line {
  position: absolute;
  left: 4px;
  right: 4px;
  top: 50%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}
.arch-link .line::after {
  content: "";
  position: absolute;
  right: 0;
  top: -3px;
  border-top: 3.5px solid transparent;
  border-bottom: 3.5px solid transparent;
  border-left: 5px solid var(--line-strong);
}
.arch-link .label {
  position: relative;
  z-index: 1;
  padding: 3px 6px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #08111c;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.arch-link.bridge .line {
  height: 2px;
  background-image: repeating-linear-gradient(90deg, rgba(66, 232, 180, 0.7) 0 5px, transparent 5px 11px);
  background-size: 22px 100%;
  animation: dashMove 1.1s linear infinite;
}
.arch-link.bridge .line::after { border-left-color: rgba(66, 232, 180, 0.8); }
.arch-link.bridge .label {
  border-color: rgba(66, 232, 180, 0.3);
  color: var(--mint);
}

.arch-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
  color: var(--dim);
  font-size: 12px;
  text-align: center;
}
.pulse-dot {
  width: 5px;
  height: 5px;
  flex: none;
  border-radius: 50%;
  background: var(--amber);
}
.arch-note code { font-size: 10.5px; color: #a8c2b9; background: rgba(255, 255, 255, 0.03); border-color: var(--line); }

.steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}
.step {
  display: flex;
  gap: 10px;
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.012);
}
.step-num {
  color: var(--mint);
  font-family: var(--mono);
  font-size: 10px;
  opacity: 0.8;
  padding-top: 2px;
}
.step h3 { margin: 0 0 5px; font-size: 13px; }
.step p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.7; }

/* ---------- features ---------- */

.features { row-gap: 18px; }
.feature { padding: 26px; }
.feature-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}
.feature-icon { width: 26px; height: 26px; color: var(--mint); }
.feature .tag { margin-top: 0; }
.feature h3 { margin: 18px 0 8px; font-size: 1.08rem; }
.feature p { font-size: 13.5px; }

/* ---------- protocol ---------- */

.proto-grid {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 22px;
  align-items: start;
}
.proto-card {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(13, 24, 38, 0.8), rgba(8, 15, 25, 0.8));
}

.frame {
  display: grid;
  grid-template-columns: 1.3fr 0.55fr 0.85fr 0.85fr 1.05fr 2.6fr;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  font-family: var(--mono);
  text-align: center;
}
.fseg {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 5px 13px;
  border-right: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.018);
}
.fseg:last-child { border-right: 0; }
.fseg span { color: var(--text); font-size: 10px; letter-spacing: 0.06em; }
.fseg small { color: var(--dim); font-size: 9px; }
.f-magic { background: rgba(66, 232, 180, 0.1); }
.f-magic span { color: var(--mint); }
.f-ver { background: rgba(108, 182, 255, 0.07); }
.f-payload {
  background-image: repeating-linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.035) 0 6px,
    transparent 6px 12px
  );
}
.frame-note { margin: 14px 0 0; color: var(--dim); font-size: 12px; line-height: 1.75; }

.chips { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 18px; }
.chip {
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.018);
  color: #a9bccf;
  font-family: var(--mono);
  font-size: 10px;
  white-space: nowrap;
}
.chip b { color: var(--mint); font-weight: 500; }
.chip-more { color: var(--dim); border-style: dashed; }

.proto-copy h3 { margin: 2px 0 16px; font-size: 1.3rem; letter-spacing: -0.01em; }

.ticks { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.ticks li {
  position: relative;
  padding-left: 24px;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.8;
}
.ticks li::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 0.55em;
  width: 11px;
  height: 6px;
  border-left: 1.5px solid var(--mint);
  border-bottom: 1.5px solid var(--mint);
  transform: rotate(-45deg);
}
.ticks b { color: var(--text); font-weight: 600; }
.ticks.small li { font-size: 12.5px; }

.callout {
  margin-top: 22px;
  padding: 20px;
  border: 1px solid rgba(255, 191, 105, 0.22);
  border-radius: 14px;
  background: rgba(255, 191, 105, 0.045);
}
.callout-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  color: var(--amber);
  font-size: 13.5px;
  font-weight: 600;
}
.callout-badge {
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--amber);
  color: #1c1305;
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.08em;
}
.callout p { margin: 0; color: #c9b99f; font-size: 12.5px; line-height: 1.85; }
.callout code { color: #ffd9a3; background: rgba(255, 191, 105, 0.08); border-color: rgba(255, 191, 105, 0.14); }

.mini-code {
  display: grid;
  gap: 5px;
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 10.5px;
  color: #d8c9b2;
}
.mini-code div { display: flex; flex-wrap: wrap; gap: 10px; }
.mini-code .mc { color: #877559; }
.mini-code .bad { color: var(--red); }
.mini-code .good { color: var(--mint); }

/* ---------- tabs / quick start ---------- */

.tabs {
  display: inline-flex;
  gap: 4px;
  margin-bottom: 22px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.018);
}
.tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 17px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 13px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}
.tab-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 17px;
  height: 17px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 9px;
}
.tab:hover { color: var(--text); }
.tab.active {
  background: rgba(66, 232, 180, 0.11);
  color: #d8fff3;
}
.tab.active .tab-num {
  border-color: rgba(66, 232, 180, 0.55);
  color: var(--mint);
}

.tab-panel[hidden] { display: none; }

.start-grid {
  display: grid;
  grid-template-columns: 1.04fr 0.96fr;
  gap: 18px;
  margin-bottom: 18px;
}
.start-side { padding: 6px 8px; }
.start-side h3 { margin: 0 0 10px; font-size: 1.05rem; }
.start-side p { margin: 0 0 14px; color: var(--muted); font-size: 13.5px; line-height: 1.85; }
.start-side p code { font-size: 0.86em; }

.code {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #060c14;
}
.code-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 14px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.018);
  color: var(--dim);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.03em;
}
.copy {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.copy:hover { color: var(--mint); border-color: rgba(66, 232, 180, 0.35); }
.copy.copied { color: var(--mint); border-color: rgba(66, 232, 180, 0.45); background: rgba(66, 232, 180, 0.08); }

pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  color: #cfe0ef;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.85;
  tab-size: 2;
}
pre .c { color: #5d7187; }
.code.wide { margin-top: 0; }

/* ---------- config tables ---------- */

.config-block {
  overflow: hidden;
  margin-bottom: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(9, 17, 28, 0.55);
}
.config-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.018);
}
.config-head h3 { margin: 0; font-size: 1.02rem; }
.config-head h3 code { margin-left: 6px; font-size: 0.8em; }
.config-head .tag { margin: 0; }

.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 12.5px;
}
th {
  padding: 11px 20px;
  border-bottom: 1px solid var(--line);
  color: var(--dim);
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-align: left;
  text-transform: uppercase;
  white-space: nowrap;
}
td {
  padding: 11px 20px;
  border-bottom: 1px solid rgba(126, 170, 210, 0.065);
  color: #b6c7d8;
  vertical-align: top;
}
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: rgba(66, 232, 180, 0.022); }
td code {
  color: #b9f5e2;
  background: rgba(66, 232, 180, 0.055);
  border-color: rgba(66, 232, 180, 0.08);
  white-space: nowrap;
  font-size: 11.5px;
}
td:nth-child(2) code {
  color: #a9c9e8;
  background: rgba(108, 182, 255, 0.055);
  border-color: rgba(108, 182, 255, 0.08);
}

.inline-tip {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 20px 20px;
  padding: 11px 14px;
  border: 1px solid rgba(255, 191, 105, 0.18);
  border-radius: 10px;
  background: rgba(255, 191, 105, 0.04);
  color: #c9b99f;
  font-size: 12px;
}
.inline-tip svg { width: 17px; height: 17px; flex: none; color: var(--amber); }
.inline-tip p { margin: 0; }
.inline-tip code { color: #ffd9a3; background: rgba(255, 191, 105, 0.07); border-color: rgba(255, 191, 105, 0.12); }

/* ---------- tunnels ---------- */

.tunnel-panel {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(13, 24, 38, 0.78), rgba(8, 15, 25, 0.78));
}
.tunnel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.018);
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--dim);
}
.tunnel-head .live { font-size: 10.5px; }
.tunnel-meta { color: var(--dim); }
.tunnel-table { min-width: 620px; }
.tunnel-table td:first-child code { font-size: 11.5px; }
.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border: 1px solid rgba(66, 232, 180, 0.18);
  border-radius: 999px;
  background: rgba(66, 232, 180, 0.06);
  color: #9fd9c6;
  font-family: var(--mono);
  font-size: 9.5px;
  white-space: nowrap;
}
.status i { width: 4px; height: 4px; border-radius: 50%; background: var(--mint); }
.status-live {
  border-color: rgba(108, 182, 255, 0.25);
  background: rgba(108, 182, 255, 0.08);
  color: #a9cdf5;
}
.status-live i { background: var(--blue); }
.tunnel-foot {
  margin: 0;
  padding: 11px 22px;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-family: var(--mono);
  font-size: 10px;
}
.tunnel-foot code { font-size: 10px; background: transparent; border: 0; padding: 0; color: #9db3c8; }

/* ---------- publish / self-hosted ---------- */

.publish-grid {
  display: grid;
  grid-template-columns: 1.06fr 0.94fr;
  gap: 18px;
  align-items: stretch;
}
.publish-card {
  display: flex;
  flex-direction: column;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(14, 25, 39, 0.75), rgba(9, 16, 26, 0.75));
}
.publish-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
}
.publish-head .tag { margin: 0; }
.publish-map { margin: 0; }
.publish-map > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}
.publish-map > div:first-child { border-top: 1px solid var(--line); }
.publish-map dt {
  flex: none;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
}
.publish-map dd {
  margin: 0;
  color: #c7d6e5;
  font-size: 12.5px;
  text-align: right;
}
.publish-map dd code { font-size: 11px; }
.publish-note {
  margin: 18px 0 0;
  color: var(--dim);
  font-size: 12px;
  line-height: 1.75;
}
.publish-warn {
  margin: 12px 0 0;
  padding: 10px 12px;
  border: 1px solid rgba(255, 191, 105, 0.16);
  border-radius: 8px;
  background: rgba(255, 191, 105, 0.035);
  color: #c9b99f;
  font-size: 11.5px;
  line-height: 1.7;
}

.publish-side {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(13, 24, 38, 0.78), rgba(8, 15, 25, 0.78));
}
.publish-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 14px;
  padding: 22px;
}
.tunnel-count {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--mono);
}
.tunnel-count span {
  color: var(--mint);
  font-size: 2.9rem;
  line-height: 1;
  letter-spacing: -0.03em;
}
.tunnel-count small { color: var(--dim); font-size: 10.5px; letter-spacing: 0.07em; }
.publish-body > p { margin: 0; color: var(--muted); font-size: 12.5px; line-height: 1.75; }
.mini-table {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 9px;
}
.mini-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 11px;
  border-bottom: 1px solid rgba(126, 170, 210, 0.08);
  font-family: var(--mono);
  font-size: 10.5px;
}
.mini-row:last-child { border-bottom: 0; }
.mini-row code {
  padding: 0;
  border: 0;
  background: transparent;
  color: #a9c9e8;
  font-size: 10.5px;
}
.mini-row span { color: var(--dim); }
.mini-label { color: var(--dim) !important; font-size: 10px !important; }
.publish-privacy {
  margin-top: auto !important;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  color: var(--dim) !important;
  font-size: 11px !important;
}
.publish-privacy code { font-size: 10px; }

/* ---------- structure ---------- */

.split-2 {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 20px;
  align-items: start;
}
.split-2 .code pre { font-size: 11.5px; }

.ops { display: grid; gap: 14px; }
.ops-card { padding: 20px 22px; }
.ops-card h3 { margin: 0 0 6px; font-size: 13.5px; }
.ops-card p { font-size: 12.5px; line-height: 1.8; }

.self-note {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 22px;
  padding: 17px 20px;
  border: 1px dashed rgba(66, 232, 180, 0.28);
  border-radius: 14px;
  background: rgba(66, 232, 180, 0.035);
  color: #b7cdc4;
  font-size: 13px;
  line-height: 1.75;
}
.self-badge {
  flex: none;
  padding: 4px 8px;
  border-radius: 5px;
  background: var(--mint);
  color: #04130d;
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
}
.self-note p { margin: 0; }

/* ---------- faq ---------- */

.faq { border-top: 1px solid var(--line); }
details {
  border-bottom: 1px solid var(--line);
}
summary {
  position: relative;
  padding: 19px 44px 19px 0;
  color: var(--text);
  font-size: 14.5px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  transition: color 0.2s ease;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--mint);
  font-family: var(--mono);
  font-size: 19px;
  font-weight: 400;
  transition: transform 0.2s ease;
}
details[open] summary { color: #fff; }
details[open] summary::after { content: "−"; }
summary:hover { color: #fff; }
details p {
  max-width: 72ch;
  margin: 0 0 20px;
  padding-right: 40px;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.85;
}

/* ---------- footer ---------- */

.footer {
  margin-top: 110px;
  padding: 54px 0 22px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(7, 12, 20, 0), rgba(9, 16, 26, 0.7));
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr 1.05fr;
  gap: 40px;
}
.footer-brand p {
  margin: 14px 0 0;
  color: var(--dim);
  font-size: 12.5px;
  line-height: 1.8;
}
.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 9px 24px;
  align-content: start;
  font-size: 12.5px;
}
.footer-links a { color: var(--muted); text-decoration: none; transition: color 0.2s ease; }
.footer-links a:hover { color: var(--mint); }
.footer-meta p {
  margin: 0 0 8px;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 10.5px;
  line-height: 1.8;
}
.footer-meta .live { font-size: 10.5px; }
.footer-publish { margin-top: 14px !important; line-height: 1.9; }
.footer-publish code { font-size: 10px; color: #8fb7a9; background: rgba(66, 232, 180, 0.05); }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-family: var(--mono);
  font-size: 10px;
}
.footer-bottom p { margin: 0; }
.to-top { color: var(--muted); text-decoration: none; transition: color 0.2s ease; }
.to-top:hover { color: var(--mint); }

/* ---------- 404 ---------- */

.notfound {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  text-align: center;
  padding-top: var(--nav-h);
}
.notfound .code-big {
  font-family: var(--mono);
  font-size: clamp(4rem, 14vw, 8rem);
  line-height: 1;
  color: var(--mint);
  letter-spacing: -0.05em;
}
.notfound h1 { margin: 0; font-size: 1.5rem; }
.notfound p { margin: 0; color: var(--muted); font-size: 14px; }
.notfound a.btn { margin-top: 10px; }

/* ---------- reveal ---------- */

html.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
}
html.js .reveal.in {
  opacity: 1;
  transform: none;
}

/* ---------- animations ---------- */

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(66, 232, 180, 0.5); }
  70% { box-shadow: 0 0 0 7px rgba(66, 232, 180, 0); }
  100% { box-shadow: 0 0 0 0 rgba(66, 232, 180, 0); }
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.25; }
}
@keyframes lineIn {
  to { opacity: 1; transform: none; }
}
@keyframes dashMove {
  to { background-position: 22px 0; }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ---------- scrollbar ---------- */

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: #05080d; }
::-webkit-scrollbar-thumb {
  background: rgba(126, 170, 210, 0.22);
  border: 2px solid #05080d;
  border-radius: 8px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(126, 170, 210, 0.35); }

/* ============================================================
   responsive
   ============================================================ */

@media (max-width: 1080px) {
  .hero { gap: 40px; }
  .arch-flow {
    grid-template-columns:
      minmax(0, 1fr) 48px minmax(0, 1fr) 58px minmax(0, 1.05fr) 66px minmax(0, 1fr) 48px minmax(0, 1fr);
  }
  .steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .proto-grid { grid-template-columns: 1fr; }
  .start-grid { grid-template-columns: 1fr; }
  .split-2 { grid-template-columns: 1fr; }
  .ops { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  :root { --nav-h: 64px; }

  .nav-toggle { display: block; }
  .nav-links {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--nav-h);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 14px 24px 24px;
    border-bottom: 1px solid var(--line);
    background: rgba(6, 11, 19, 0.98);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    max-height: calc(100vh - var(--nav-h));
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
  }
  .nav.open .nav-links { opacity: 1; visibility: visible; transform: none; }
  .nav-links a { padding: 10px 2px; font-size: 14px; }
  .nav-links a.active::after { display: none; }
  .nav-links .nav-cta { margin-top: 10px; text-align: center; padding: 10px 16px; }
  .nav-links .nav-cta:hover { background: rgba(66, 232, 180, 0.14); }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 118px;
    gap: 34px;
  }
  .hero-visual { max-width: 600px; }
  .hero-meta { margin-top: 30px; }

  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat:nth-child(3) { border-left: 0; }
  .stat:nth-child(n + 3) { border-top: 1px solid var(--line); }

  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .arch-panel { padding: 22px 16px 16px; }
  .arch-flow { grid-template-columns: 1fr; }
  .arch-link { height: 46px; }
  .arch-link .line {
    left: 50%;
    right: auto;
    top: 4px;
    bottom: 4px;
    width: 1px;
    height: auto;
    background: linear-gradient(180deg, transparent, var(--line-strong), transparent);
  }
  .arch-link .line::after {
    right: auto;
    top: auto;
    bottom: 0;
    left: -3px;
    border-top: 5px solid var(--line-strong);
    border-right: 3.5px solid transparent;
    border-left: 3.5px solid transparent;
    border-bottom: 0;
  }
  .arch-link.bridge .line {
    width: 2px;
    background-image: repeating-linear-gradient(180deg, rgba(66, 232, 180, 0.7) 0 5px, transparent 5px 11px);
    background-size: 100% 22px;
    animation-name: dashMoveY;
  }
  .arch-link.bridge .line::after {
    border-top-color: rgba(66, 232, 180, 0.8);
    border-left-color: transparent;
    border-right-color: transparent;
  }
  .arch-node { min-height: 0; padding: 18px 12px 16px; }
  .node-icon { margin-top: 4px; }
  .arch-note { font-size: 11px; }

  .steps { grid-template-columns: 1fr; gap: 8px; }
  .step { padding: 14px 16px; }

  .publish-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .footer-meta { grid-column: 1 / -1; }
}

@keyframes dashMoveY {
  to { background-position: 0 22px; }
}

@media (max-width: 680px) {
  .wrap { width: calc(100% - 32px); }
  .section { padding-top: 88px; }

  .hero { padding-top: 102px; }
  h1 { font-size: clamp(2.15rem, 9vw, 3rem); }
  .lede { font-size: 0.97rem; line-height: 1.85; }
  .hero-meta { gap: 10px 0; }
  .hero-meta li { padding: 0 12px; font-size: 11.5px; }
  .hero-meta span { font-size: 10.5px; }

  .float-chip { display: none; }
  .term-body { min-height: 210px; padding: 16px 15px 8px; font-size: 11px; line-height: 2; }
  .term-foot { gap: 12px; font-size: 9px; }

  .stats-wrap { margin-top: 46px; }
  .stat { padding: 18px 16px; }
  .stat-num { font-size: 1.6rem; }

  .grid-3 { grid-template-columns: 1fr; gap: 12px; }
  .card { padding: 22px; }
  .num-card { min-height: 0; }
  .tag { margin-top: 16px; }

  .section-head { margin-bottom: 34px; }
  .section-head > p:last-child { font-size: 0.94rem; }

  .arch-note { align-items: flex-start; text-align: left; }

  .tabs {
    display: flex;
    width: 100%;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .tabs::-webkit-scrollbar { display: none; }
  .tab { flex: 1 0 auto; justify-content: center; padding: 8px 12px; font-size: 12px; }

  .frame { grid-template-columns: 1.2fr 0.6fr 0.9fr 0.9fr 1fr 2.2fr; }
  .fseg { padding: 14px 3px 10px; }
  .fseg span { font-size: 8.5px; letter-spacing: 0; }
  .fseg small { font-size: 8px; }
  .proto-card { padding: 18px; }
  .chips { gap: 5px; }
  .chip { font-size: 9px; padding: 4px 7px; }

  pre { font-size: 11px; padding: 14px; }
  .config-head { padding: 15px 18px; }
  th, td { padding: 10px 16px; }
  table { min-width: 620px; }
  .inline-tip { margin: 0 14px 16px; }

  .publish-card { padding: 22px; }
  .publish-body { padding: 18px; }
  .tunnel-head { padding: 12px 16px; font-size: 9.5px; }
  .tunnel-meta { display: none; }
  .tunnel-foot { padding: 10px 16px; }

  .ops { grid-template-columns: 1fr; }

  .self-note { flex-direction: column; align-items: flex-start; gap: 10px; }

  summary { padding-right: 32px; font-size: 13.5px; }
  details p { padding-right: 0; font-size: 12.5px; }

  .footer { margin-top: 80px; padding-top: 40px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-meta { grid-column: auto; }
  .footer-bottom { flex-direction: column; align-items: flex-start; margin-top: 28px; }
}

@media (max-width: 420px) {
  .actions { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
  .hero-meta li { padding: 0 10px; }
  .hero-meta li:nth-child(3) { border-left: 0; padding-left: 0; }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  html.js .reveal { opacity: 1; transform: none; }
}