/* ===== local fonts ===== */
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url("../font/jetbrainsmono-400.woff2") format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 700; font-display: swap; src: url("../font/jetbrainsmono-700.woff2") format("woff2"); }
@font-face { font-family: "Orbitron"; font-style: normal; font-weight: 500; font-display: swap; src: url("../font/orbitron-500.woff2") format("woff2"); }
@font-face { font-family: "Orbitron"; font-style: normal; font-weight: 700; font-display: swap; src: url("../font/orbitron-700.woff2") format("woff2"); }
@font-face { font-family: "Orbitron"; font-style: normal; font-weight: 900; font-display: swap; src: url("../font/orbitron-900.woff2") format("woff2"); }

/* ===== reset / variables ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #050816;
  --bg-2: #0a0f24;
  --surface: rgba(20, 30, 65, 0.4);
  --surface-2: rgba(30, 45, 90, 0.6);
  --border: rgba(120, 150, 255, 0.18);
  --border-hover: rgba(0, 255, 229, 0.5);

  --neon: #00ffe5;
  --neon-2: #b46bff;
  --neon-3: #ff2eb5;
  --neon-4: #6ee7ff;
  --gold: #ffd86b;
  --green: #2bff88;

  --text: #e8ecff;
  --text-2: #a6b0d8;
  --text-3: #6e779e;

  --font-sans: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  --font-display: "Orbitron", var(--font-sans);

  --radius: 14px;
  --radius-sm: 10px;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input { font-family: inherit; color: inherit; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; position: relative; z-index: 2; }

/* ===== background layers ===== */
#bgCanvas {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
}
.bg-grid {
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  background-image:
    linear-gradient(rgba(120,150,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120,150,255,0.06) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
}
.bg-orb {
  position: fixed; border-radius: 50%; pointer-events: none; z-index: 0;
  filter: blur(120px); opacity: 0.5;
}
.bg-orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, var(--neon-2), transparent 60%);
  top: -100px; left: -150px;
  animation: float1 18s ease-in-out infinite;
}
.bg-orb-2 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, var(--neon), transparent 60%);
  bottom: -200px; right: -200px;
  animation: float2 22s ease-in-out infinite;
}
@keyframes float1 {
  0%,100% { transform: translate(0,0); }
  50% { transform: translate(80px, 60px); }
}
@keyframes float2 {
  0%,100% { transform: translate(0,0); }
  50% { transform: translate(-100px, -50px); }
}

/* ===== navbar ===== */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(5, 8, 22, 0.7);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px; gap: 16px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 800; font-size: 18px;
  letter-spacing: 1px;
}
.logo-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--neon), var(--neon-2));
  border-radius: 8px; color: #000; font-size: 18px;
  box-shadow: 0 0 20px rgba(0,255,229,0.4);
}
.logo-text b {
  background: linear-gradient(90deg, var(--neon), var(--neon-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu { display: flex; gap: 4px; flex: 1; justify-content: center; }
.nav-link {
  font-family: var(--font-mono);
  padding: 8px 14px; border-radius: 6px;
  font-size: 13px; color: var(--text-2);
  transition: all .2s;
  position: relative;
}
.nav-link:hover { color: var(--neon); }
.nav-link.active {
  color: var(--neon);
  background: rgba(0,255,229,0.08);
  text-shadow: 0 0 8px rgba(0,255,229,0.6);
}
.nav-toggle { display: none; font-size: 26px; color: var(--text); }

.btn-wallet {
  padding: 9px 18px; border-radius: 8px;
  font-family: var(--font-mono); font-size: 13px; font-weight: 600;
  background: linear-gradient(135deg, rgba(0,255,229,0.15), rgba(180,107,255,0.15));
  border: 1px solid var(--border);
  color: var(--neon);
  transition: all .2s;
}
.btn-wallet:hover {
  border-color: var(--neon);
  box-shadow: 0 0 16px rgba(0,255,229,0.35);
}

/* ===== hero ===== */
.hero {
  padding: 100px 0 80px;
  text-align: center;
  position: relative;
}
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 18px;
  background: rgba(0,255,229,0.08);
  border: 1px solid rgba(0,255,229,0.3);
  border-radius: 50px;
  font-family: var(--font-mono); font-size: 12px;
  color: var(--neon);
  margin-bottom: 28px;
}
.dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 10px var(--green);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%,100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.9); }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 6.5vw, 78px);
  font-weight: 900; letter-spacing: 2px;
  line-height: 1.05;
  margin-bottom: 24px;
}
.hero-title .grad {
  background: linear-gradient(90deg, var(--neon) 0%, var(--neon-2) 50%, var(--neon-3) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 24px rgba(180,107,255,0.4));
}

/* glitch effect */
.glitch {
  position: relative; display: inline-block;
  color: var(--text);
}
.glitch::before, .glitch::after {
  content: attr(data-text);
  position: absolute; left: 0; top: 0; width: 100%;
  overflow: hidden;
}
.glitch::before {
  color: var(--neon);
  transform: translate(-2px, 0);
  clip-path: polygon(0 0, 100% 0, 100% 45%, 0 45%);
  animation: glitch1 4s infinite linear alternate-reverse;
}
.glitch::after {
  color: var(--neon-3);
  transform: translate(2px, 0);
  clip-path: polygon(0 60%, 100% 60%, 100% 100%, 0 100%);
  animation: glitch2 3s infinite linear alternate-reverse;
}
@keyframes glitch1 {
  0%,90%,100% { transform: translate(-2px, 0); }
  92% { transform: translate(-4px, -1px); }
  94% { transform: translate(1px, 1px); }
}
@keyframes glitch2 {
  0%,88%,100% { transform: translate(2px, 0); }
  90% { transform: translate(4px, 1px); }
  93% { transform: translate(-1px, -1px); }
}

.hero-sub {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--text-2);
  margin-bottom: 32px;
  letter-spacing: 0.5px;
}

.hero-notice {
  display: inline-flex; align-items: center; gap: 14px;
  max-width: 780px;
  background: rgba(255,216,107,0.06);
  border: 1px solid rgba(255,216,107,0.25);
  padding: 14px 22px;
  border-radius: 10px;
  font-size: 13.5px; line-height: 1.7;
  margin-bottom: 36px;
  text-align: left;
  color: var(--text-2);
}
.hero-notice b { color: var(--gold); }
.notice-tag {
  font-family: var(--font-mono);
  background: var(--gold); color: #000;
  padding: 3px 10px; border-radius: 4px; font-size: 11px; font-weight: 700;
  flex-shrink: 0;
}

.hero-cta {
  display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
  margin-bottom: 64px;
}

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px; border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 14px; font-weight: 700;
  letter-spacing: 0.5px;
  transition: all .2s;
  position: relative;
  text-transform: uppercase;
}
.btn-primary {
  background: linear-gradient(135deg, var(--neon) 0%, var(--neon-2) 100%);
  color: #000;
  box-shadow: 0 0 24px rgba(0,255,229,0.4), 0 0 48px rgba(180,107,255,0.25);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 32px rgba(0,255,229,0.6), 0 0 64px rgba(180,107,255,0.4);
}
.btn-ghost {
  background: rgba(255,255,255,0.03);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--neon);
  color: var(--neon);
  box-shadow: 0 0 16px rgba(0,255,229,0.3);
}
.btn-lg { padding: 18px 40px; font-size: 15px; }
.btn-sm { padding: 6px 14px; font-size: 11px; }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 16px; max-width: 800px; margin: 0 auto;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 14px;
  backdrop-filter: blur(10px);
  transition: all .2s;
}
.stat:hover {
  border-color: var(--neon);
  transform: translateY(-3px);
  box-shadow: 0 0 24px rgba(0,255,229,0.2);
}
.stat b {
  display: block;
  font-family: var(--font-display); font-weight: 800;
  font-size: 32px;
  background: linear-gradient(135deg, var(--neon), var(--neon-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}
.stat b small { font-size: 16px; }
.stat span {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--text-3); letter-spacing: 0.5px;
}

/* ===== sections ===== */
.flow, .panel { padding: 90px 0; position: relative; }
.section-title {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  text-align: center;
  margin-bottom: 14px;
  letter-spacing: 1.5px;
}
.bracket { color: var(--neon); }
.section-sub {
  text-align: center;
  color: var(--text-2);
  font-size: 14px;
  margin-bottom: 44px;
}
.section-sub b { color: var(--neon); }

/* ===== flow ===== */
.flow-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
}
.flow-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: all .2s;
  position: relative;
  overflow: hidden;
}
.flow-item::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(135deg, transparent, rgba(0,255,229,0.06));
  opacity: 0; transition: opacity .25s;
}
.flow-item:hover { transform: translateY(-4px); border-color: var(--neon); }
.flow-item:hover::before { opacity: 1; }
.flow-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 36px;
  background: linear-gradient(135deg, var(--neon), var(--neon-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 10px;
  letter-spacing: 1px;
}
.flow-text { font-size: 14px; color: var(--text-2); position: relative; z-index: 1; }

/* ===== cards ===== */
.card-grid { display: grid; gap: 20px; margin-bottom: 36px; }
.card-grid.two { grid-template-columns: repeat(2, 1fr); }
.card-grid.three { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  backdrop-filter: blur(12px);
  transition: all .25s;
  position: relative;
  overflow: hidden;
}
.neon-card::before {
  content: "";
  position: absolute; inset: -1px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, transparent, rgba(0,255,229,0.4), transparent);
  opacity: 0; transition: opacity .3s;
  pointer-events: none;
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  padding: 1px;
}
.neon-card:hover::before { opacity: 1; }
.neon-card:hover { transform: translateY(-4px); }

.card-corner {
  position: absolute; top: 0; right: 0;
  width: 30px; height: 30px;
  border-top: 2px solid var(--neon);
  border-right: 2px solid var(--neon);
  opacity: 0.5;
}
.card-corner::after {
  content: ""; position: absolute; bottom: -20px; left: -20px;
  width: 20px; height: 20px;
  border-bottom: 2px solid var(--neon-2);
  border-left: 2px solid var(--neon-2);
  opacity: 0.6;
}
.card-head { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 12px; }
.card-tag {
  font-family: var(--font-mono); font-size: 11px;
  padding: 3px 10px; border-radius: 4px; font-weight: 700; letter-spacing: 0.5px;
}
.card-tag.green { background: rgba(43,255,136,0.15); color: var(--green); border: 1px solid rgba(43,255,136,0.3); }
.card-tag.purple { background: rgba(180,107,255,0.15); color: var(--neon-2); border: 1px solid rgba(180,107,255,0.3); }
.card h3 { font-family: var(--font-display); font-size: 18px; font-weight: 700; color: var(--text); }
.card-price {
  font-family: var(--font-display); font-size: 40px; font-weight: 800;
  background: linear-gradient(135deg, var(--neon), var(--neon-4));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 12px 0;
}
.card-price small { font-size: 16px; color: var(--text-3); font-weight: 600; -webkit-text-fill-color: var(--text-3); }
.card-desc { font-size: 13px; color: var(--text-2); line-height: 1.7; }
.card-icon { font-size: 38px; margin-bottom: 14px; filter: drop-shadow(0 0 10px rgba(0,255,229,0.4)); }
.card p { color: var(--text-2); font-size: 13.5px; }

.service-card { text-align: center; }
.service-card .mono { color: var(--neon); margin: 10px 0 16px; }

/* ===== form ===== */
.form-card.glass {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  backdrop-filter: blur(14px);
  position: relative;
}
.form-card.glass::before {
  content: "";
  position: absolute; top: 0; left: 30px; right: 30px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon), transparent);
  opacity: 0.4;
}
.form-label {
  display: block;
  font-family: var(--font-mono); font-size: 12px;
  color: var(--neon); letter-spacing: 0.5px;
  margin: 22px 0 10px;
}
.form-label:first-child { margin-top: 0; }
.form-tip {
  padding: 12px 16px;
  background: rgba(0,255,229,0.08);
  border: 1px solid rgba(0,255,229,0.25);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-2);
  margin-bottom: 4px;
}
.form-tip b { color: var(--neon); }
.form-input {
  width: 100%;
  padding: 14px 16px;
  background: rgba(5,8,22,0.6);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-mono); font-size: 14px;
  color: var(--text);
  transition: all .15s;
}
.form-input:focus {
  outline: none;
  border-color: var(--neon);
  box-shadow: 0 0 0 3px rgba(0,255,229,0.15);
  background: rgba(5,8,22,0.9);
}
.form-input.readonly { color: var(--neon); cursor: not-allowed; }
.form-input::placeholder { color: var(--text-3); }

.pill-group { display: flex; flex-wrap: wrap; gap: 10px; }
.pill {
  padding: 9px 18px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-mono); font-size: 13px;
  color: var(--text-2);
  transition: all .15s;
}
.pill:hover { border-color: var(--neon); color: var(--neon); }
.pill.active {
  background: linear-gradient(135deg, var(--neon), var(--neon-2));
  color: #000;
  border-color: transparent;
  font-weight: 700;
  box-shadow: 0 0 16px rgba(0,255,229,0.4);
}
.pill-custom { color: var(--neon-2); border-color: rgba(180,107,255,0.3); }
.pill-custom.active { background: linear-gradient(135deg, var(--neon-2), var(--neon-3)); color: #fff; }

/* ===== pay box ===== */
.pay-box {
  margin-top: 28px; padding: 24px;
  background: rgba(5,8,22,0.4);
  border: 1px dashed var(--border);
  border-radius: 10px;
  position: relative;
}
.pay-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 0; border-bottom: 1px dashed var(--border);
  gap: 14px; flex-wrap: wrap;
}
.pay-row:last-of-type { border-bottom: none; }
.pay-key {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--text-3); letter-spacing: 0.5px;
}
.pay-val { font-size: 15px; font-weight: 600; color: var(--text); text-align: right; }
.pay-val[data-pay] {
  font-family: var(--font-display); font-size: 22px;
  background: linear-gradient(135deg, var(--neon), var(--neon-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.mono { font-family: var(--font-mono); font-size: 12.5px; word-break: break-all; }
.addr { color: var(--text-2); }
.copy-btn {
  padding: 5px 12px;
  background: rgba(0,255,229,0.1);
  border: 1px solid rgba(0,255,229,0.3);
  border-radius: 4px;
  color: var(--neon);
  font-family: var(--font-mono); font-size: 11px; font-weight: 700;
  margin-left: 8px;
  letter-spacing: 0.5px;
  transition: all .15s;
}
.copy-btn:hover {
  background: var(--neon); color: #000;
  box-shadow: 0 0 10px rgba(0,255,229,0.5);
}

.pay-qr {
  display: flex; align-items: center; gap: 18px;
  margin-top: 18px; padding-top: 18px;
  border-top: 1px dashed var(--border);
}
.qr-img {
  width: 90px; height: 90px; flex-shrink: 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px;
  object-fit: contain;
  box-shadow: 0 0 16px rgba(0,255,229,0.2);
}
.pay-tip { font-size: 13px; color: var(--text-2); line-height: 1.7; }

/* ===== features ===== */
.feature-list {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px;
  max-width: 800px; margin: 0 auto 32px;
}
.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 14px 18px;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-2);
  backdrop-filter: blur(10px);
}

/* ===== exchange ===== */
.rate-bar {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 14px; margin-bottom: 32px;
}
.rate-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
  backdrop-filter: blur(10px);
}
.rate-item span {
  display: block;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--text-3); letter-spacing: 0.5px;
  margin-bottom: 6px;
}
.rate-item b {
  font-family: var(--font-display); font-size: 16px;
  color: var(--neon);
}

.exchange-row {
  display: grid; grid-template-columns: 1fr auto 1fr;
  gap: 18px; align-items: end; margin-bottom: 18px;
}
.exchange-arrow {
  font-size: 36px; color: var(--neon);
  padding-bottom: 14px;
  filter: drop-shadow(0 0 8px rgba(0,255,229,0.6));
}
.exchange-input { position: relative; }
.exchange-input .suffix {
  position: absolute; right: 16px; top: 50%; transform: translateY(-50%);
  font-family: var(--font-mono); font-size: 13px; font-weight: 600;
  color: var(--neon);
}
.exchange-input input { padding-right: 64px; }
.hint { font-family: var(--font-mono); font-size: 11px; color: var(--text-3); margin-top: 8px; }

/* ===== about ===== */
.about-text {
  max-width: 840px; margin: 0 auto 36px;
  font-size: 15.5px; line-height: 2; color: var(--text-2); text-align: center;
}
.about-text b { color: var(--neon); }

.tag-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
  max-width: 900px; margin: 0 auto;
}
.tag-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  text-align: center;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text);
  backdrop-filter: blur(10px);
  transition: all .25s;
}
.tag-item:hover {
  border-color: var(--neon);
  transform: translateY(-3px);
  box-shadow: 0 0 20px rgba(0,255,229,0.2);
}

.cta-center { text-align: center; margin-top: 30px; }

/* ===== footer ===== */
.footer {
  background: linear-gradient(180deg, transparent, rgba(5,8,22,0.9));
  border-top: 1px solid var(--border);
  padding: 60px 0 28px;
  margin-top: 60px;
  position: relative;
}
.footer::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon), transparent);
  opacity: 0.5;
}
.footer-top {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--border);
}
.footer-brand p {
  margin-top: 14px;
  font-size: 13px; line-height: 1.8;
  color: var(--text-2);
}
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--neon); letter-spacing: 1px;
  margin-bottom: 14px;
}
.footer-col li {
  padding: 5px 0; font-size: 13px; color: var(--text-2);
}
.footer-col a { transition: color .15s; }
.footer-col a:hover { color: var(--neon); }
.footer-bottom {
  margin-top: 24px;
  display: flex; justify-content: space-between;
  font-family: var(--font-mono); font-size: 12px;
  color: var(--text-3);
  flex-wrap: wrap; gap: 10px;
}
.status { color: var(--green); }

/* ===== toast ===== */
.toast {
  position: fixed; bottom: 40px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(5,8,22,0.95);
  border: 1px solid var(--neon);
  color: var(--neon);
  font-family: var(--font-mono);
  padding: 12px 22px; border-radius: 8px;
  font-size: 13px;
  opacity: 0; pointer-events: none;
  transition: all .25s;
  z-index: 200;
  box-shadow: 0 0 24px rgba(0,255,229,0.4);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===== responsive ===== */
@media (max-width: 980px) {
  .nav-menu {
    position: absolute; top: 68px; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: rgba(5,8,22,0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 10px 20px; display: none;
  }
  .nav-menu.open { display: flex; }
  .nav-link { padding: 12px 14px; }
  .nav-toggle { display: block; }
  .btn-wallet { display: none; }
  .hero-stats, .flow-grid, .feature-list, .tag-grid,
  .card-grid.two, .card-grid.three, .rate-bar, .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
  .exchange-row { grid-template-columns: 1fr; }
  .exchange-arrow { transform: rotate(90deg); padding: 0; text-align: center; }
}
@media (max-width: 560px) {
  .hero { padding: 60px 0 50px; }
  .hero-stats, .flow-grid, .feature-list, .tag-grid,
  .card-grid.two, .card-grid.three, .rate-bar, .footer-top {
    grid-template-columns: 1fr;
  }
  .pay-qr { flex-direction: column; align-items: flex-start; }
  .hero-notice { flex-direction: column; align-items: flex-start; }
}