/* ============ Reset & Base ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Rajdhani', 'Noto Sans SC', -apple-system, sans-serif;
  background: #05060a;
  color: #d8e3f5;
  line-height: 1.6;
  overflow-x: hidden;
  cursor: default;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul, ol { list-style: none; }

:root {
  --bg: #05060a;
  --bg-2: #0b0e16;
  --bg-3: #131722;
  --line: #1f2734;
  --text: #d8e3f5;
  --muted: #7a8aa3;
  --acc: #00e5ff;
  --acc-2: #7c5dff;
  --acc-3: #ff3864;
  --grad: linear-gradient(135deg, #00e5ff 0%, #7c5dff 60%, #ff3864 100%);
  --glow: 0 0 40px rgba(0, 229, 255, 0.4);
}

::selection { background: var(--acc); color: #000; }

/* ============ Loader ============ */
.loader {
  position: fixed; inset: 0; z-index: 9999;
  background: #000;
  display: grid; place-items: center;
  transition: opacity .8s ease, visibility .8s;
}
.loader.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.loader-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0,229,255,.15) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,255,.15) 1px, transparent 1px);
  background-size: 60px 60px;
  mask: radial-gradient(ellipse at center, #000 30%, transparent 75%);
  -webkit-mask: radial-gradient(ellipse at center, #000 30%, transparent 75%);
  animation: gridmove 8s linear infinite;
}
@keyframes gridmove {
  0% { background-position: 0 0; }
  100% { background-position: 60px 60px; }
}
.loader-text { text-align: center; z-index: 1; }
.loader-h {
  font-family: 'Orbitron', sans-serif;
  font-size: 64px; font-weight: 900;
  letter-spacing: 12px;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  display: block;
}
.loader-sub {
  display: block; margin-top: 8px;
  color: var(--muted); letter-spacing: 6px; font-size: 12px;
  font-family: 'Orbitron', sans-serif;
}
.loader-bar {
  width: 280px; height: 2px; margin: 24px auto 0;
  background: rgba(255,255,255,0.06); overflow: hidden;
}
.loader-bar-fill {
  height: 100%; width: 0;
  background: var(--grad);
  animation: barfill 1.6s ease-out forwards;
}
@keyframes barfill { to { width: 100%; } }

/* ============ Nav ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 18px 0;
  transition: backdrop-filter .3s, background .3s, padding .3s;
}
.nav.scrolled {
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(5, 6, 10, 0.75);
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}
.nav-inner {
  max-width: 1400px; margin: 0 auto; padding: 0 32px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-mark { color: var(--acc); display: flex; }
.logo-text {
  font-family: 'Orbitron', sans-serif;
  font-weight: 900; font-size: 20px; letter-spacing: 2px;
}
.logo-text em {
  font-style: normal; font-weight: 500;
  color: var(--muted); margin-left: 6px; font-size: 14px;
}
.nav-links { display: flex; gap: 36px; }
.nav-links a {
  position: relative; font-size: 15px; font-weight: 500;
  color: #aab8cc; transition: color .25s;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -6px; left: 0;
  width: 0; height: 2px; background: var(--acc);
  transition: width .3s ease;
}
.nav-links a:hover { color: var(--acc); }
.nav-links a:hover::after { width: 100%; }
.btn-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px; font-weight: 700; font-size: 14px;
  background: var(--grad); color: #000; border-radius: 2px;
  letter-spacing: 1px;
  transition: transform .2s, box-shadow .2s;
  position: relative; overflow: hidden;
}
.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 229, 255, 0.4);
}
.btn-cta::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,.4) 50%, transparent 70%);
  transform: translateX(-120%);
  transition: transform .6s;
}
.btn-cta:hover::before { transform: translateX(120%); }

/* ============ Hero ============ */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: 120px 32px 80px; overflow: hidden;
  background: radial-gradient(ellipse at top, #0a1428 0%, #05060a 60%);
}
#bg-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
  opacity: 0.5; pointer-events: none;
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0,229,255,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,255,.06) 1px, transparent 1px);
  background-size: 80px 80px;
  mask: radial-gradient(ellipse at 50% 60%, #000 0%, transparent 70%);
  -webkit-mask: radial-gradient(ellipse at 50% 60%, #000 0%, transparent 70%);
  pointer-events: none;
}
.hero-scan {
  position: absolute; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--acc), transparent);
  opacity: 0.6; box-shadow: 0 0 30px var(--acc);
  animation: scan 6s linear infinite;
  pointer-events: none;
}
@keyframes scan {
  0% { top: 0; }
  50% { top: 100%; }
  100% { top: 0; }
}
.hero-content {
  position: relative; z-index: 2; text-align: center;
  max-width: 1100px; width: 100%;
}
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; margin-bottom: 24px;
  border: 1px solid var(--line); border-radius: 100px;
  font-family: 'Orbitron', sans-serif;
  font-size: 11px; letter-spacing: 3px; color: var(--muted);
  background: rgba(0,0,0,0.3); backdrop-filter: blur(8px);
}
.hero-tag .dot {
  width: 8px; height: 8px; border-radius: 50%; background: #4ade80;
  box-shadow: 0 0 12px #4ade80;
  animation: pulse 1.5s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.3); }
}
.hero-title {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(48px, 9vw, 128px);
  font-weight: 900; line-height: 0.95;
  letter-spacing: 2px; margin-bottom: 24px;
}
.hero-title .line { display: block; }
.hero-title .line.accent {
  font-family: 'Noto Sans SC', sans-serif;
  font-size: clamp(32px, 5vw, 64px);
  font-weight: 900;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-top: 6px;
}
.glitch { position: relative; display: inline-block; }
.glitch::before, .glitch::after {
  content: attr(data-text);
  position: absolute; left: 0; top: 0;
  width: 100%; opacity: 0;
}
.glitch::before { color: var(--acc); transform: translate(-3px, 0); }
.glitch::after { color: var(--acc-3); transform: translate(3px, 0); }
.glitch:hover::before, .glitch:hover::after { opacity: 0.7; animation: glitch .4s steps(2) infinite; }
@keyframes glitch {
  0% { transform: translate(-3px, 1px); }
  50% { transform: translate(3px, -1px); }
  100% { transform: translate(-3px, 1px); }
}

.hero-subtitle {
  font-size: clamp(15px, 1.6vw, 19px); color: #95a5be;
  margin-bottom: 40px; line-height: 1.8;
}
.hero-sub-en {
  display: inline-block; margin-top: 6px; font-size: 14px;
  color: var(--muted); letter-spacing: 2px;
  font-family: 'Orbitron', sans-serif;
}

.hero-cta { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; margin-bottom: 80px; }
/* === Primary CTA: 双层卡片按钮 === */
.btn-primary {
  position: relative;
  display: inline-flex; align-items: center; gap: 16px;
  padding: 14px 22px 14px 18px;
  background: linear-gradient(135deg, #00e5ff 0%, #7c5dff 100%);
  color: #000; border-radius: 4px;
  box-shadow:
    0 0 0 1px rgba(0,229,255,0.4),
    0 12px 40px -8px rgba(0,229,255,0.55),
    inset 0 1px 0 rgba(255,255,255,0.4);
  transition: transform .3s cubic-bezier(.2,.7,.3,1.4),
              box-shadow .3s, padding .3s;
  overflow: hidden;
  isolation: isolate;
}
.btn-primary::before {
  content: ''; position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(135deg, #ff3864 0%, #7c5dff 50%, #00e5ff 100%);
  opacity: 0; transition: opacity .4s;
}
.btn-primary:hover {
  transform: translateY(-4px);
  padding-right: 28px;
  box-shadow:
    0 0 0 1px rgba(255,56,100,0.5),
    0 20px 50px -8px rgba(124,93,255,0.7),
    inset 0 1px 0 rgba(255,255,255,0.5);
}
.btn-primary:hover::before { opacity: 1; }
.btn-primary:active { transform: translateY(-1px) scale(0.98); }

.btn-primary .btn-icon {
  flex-shrink: 0;
  background: rgba(0,0,0,0.18);
  padding: 8px; width: 36px; height: 36px;
  border-radius: 4px;
  transition: transform .4s, background .3s;
}
.btn-primary:hover .btn-icon {
  transform: rotate(-12deg) scale(1.1);
  background: rgba(0,0,0,0.28);
}
.btn-primary .btn-text {
  display: flex; flex-direction: column; align-items: flex-start;
  line-height: 1.15; text-align: left;
}
.btn-primary .btn-text em {
  font-style: normal;
  font-family: 'Orbitron', sans-serif;
  font-size: 10px; font-weight: 700;
  letter-spacing: 3px;
  color: rgba(0,0,0,0.65);
  text-transform: uppercase;
}
.btn-primary .btn-text strong {
  font-size: 16px; font-weight: 800; letter-spacing: .5px;
  color: #000; margin-top: 2px;
}
.btn-primary .btn-arrow {
  flex-shrink: 0; font-size: 22px; font-weight: 700;
  transition: transform .35s cubic-bezier(.2,.7,.3,1.4);
  color: rgba(0,0,0,0.85);
}
.btn-primary:hover .btn-arrow { transform: translateX(6px); }

.btn-bg {
  position: absolute; inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,.5) 50%, transparent 70%);
  transform: translateX(-100%);
  pointer-events: none;
}
.btn-primary:hover .btn-bg { animation: shine 1.2s; }
@keyframes shine { to { transform: translateX(100%); } }

/* === Ghost button === */
.btn-ghost {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 18px 26px;
  border: 1px solid var(--line);
  color: var(--text);
  background: rgba(0,0,0,0.3);
  backdrop-filter: blur(8px);
  font-weight: 600; font-size: 14px; letter-spacing: 1px;
  border-radius: 4px;
  transition: all .3s;
  position: relative; overflow: hidden;
}
.btn-ghost::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, rgba(0,229,255,0.1), transparent);
  transform: translateX(-100%);
  transition: transform .5s;
}
.btn-ghost:hover {
  border-color: var(--acc); color: var(--acc);
  transform: translateY(-3px);
}
.btn-ghost:hover::after { transform: translateX(100%); }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 16px; max-width: 800px; margin: 0 auto;
}
.stat {
  position: relative; padding: 20px 16px;
  background: rgba(11, 14, 22, 0.5); backdrop-filter: blur(12px);
  border: 1px solid var(--line);
  text-align: center; overflow: hidden;
  transition: border-color .3s, transform .3s;
}
.stat:hover { border-color: var(--acc); transform: translateY(-4px); }
.stat::before {
  content: ''; position: absolute; top: 0; left: -100%;
  width: 100%; height: 2px; background: var(--grad);
  transition: left .5s;
}
.stat:hover::before { left: 0; }
.stat b {
  font-family: 'Orbitron', sans-serif;
  display: block; font-size: 36px; font-weight: 900;
  background: var(--grad); -webkit-background-clip: text;
  background-clip: text; -webkit-text-fill-color: transparent;
}
.stat b.stat-text {
  font-size: 32px;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: arrowBounce 1.6s ease-in-out infinite;
}
@keyframes arrowBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
.stat span {
  display: block; margin-top: 4px;
  color: var(--muted); font-size: 12px; letter-spacing: 1px;
}

.hero-scroll {
  position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%);
  text-align: center; color: var(--muted);
  font-family: 'Orbitron', sans-serif;
  font-size: 10px; letter-spacing: 4px;
}
.scroll-line {
  width: 1px; height: 40px; margin: 8px auto 0;
  background: linear-gradient(to bottom, var(--acc), transparent);
  animation: scrollDown 2s ease-in-out infinite;
}
@keyframes scrollDown {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ============ Section common ============ */
section { padding: 120px 32px; position: relative; }
.sec-head { max-width: 1400px; margin: 0 auto 80px; text-align: center; }
.sec-head.center { text-align: center; }
.sec-tag {
  display: inline-block; margin-bottom: 16px;
  font-family: 'Orbitron', sans-serif;
  font-size: 11px; letter-spacing: 4px;
  color: var(--acc);
}
.sec-tag.center { display: block; }
.sec-head h2 {
  font-family: 'Noto Sans SC', sans-serif;
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 900; line-height: 1.2; margin-bottom: 12px;
}
.sec-head h2 em {
  font-style: normal;
  background: var(--grad); -webkit-background-clip: text;
  background-clip: text; -webkit-text-fill-color: transparent;
}
.sec-head p { color: var(--muted); font-size: 16px; }

/* ============ Features ============ */
.features { background: linear-gradient(180deg, #05060a 0%, #08101e 50%, #05060a 100%); }
.feature-grid {
  max-width: 1400px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.feature-card {
  position: relative; padding: 32px;
  background: linear-gradient(160deg, rgba(15,20,32,0.95) 0%, rgba(8,12,20,0.95) 100%);
  border: 1px solid var(--line);
  transition: transform .4s, border-color .4s;
  overflow: hidden; cursor: default;
}
.feature-card:hover {
  transform: translateY(-8px);
  border-color: var(--acc);
}
.feature-card.big { grid-column: span 2; grid-row: span 1; }
.card-glow {
  position: absolute; top: -100px; right: -100px;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(0,229,255,0.18) 0%, transparent 60%);
  pointer-events: none;
  transition: transform .6s;
}
.feature-card:hover .card-glow { transform: scale(1.5); }
.card-icon {
  width: 48px; height: 48px; color: var(--acc);
  margin-bottom: 20px;
  filter: drop-shadow(0 0 8px rgba(0,229,255,0.4));
  transition: transform .4s;
}
.feature-card:hover .card-icon { transform: rotate(8deg) scale(1.1); }
.feature-card h3 {
  font-size: 20px; font-weight: 700; margin-bottom: 10px;
  color: #fff;
}
.feature-card p { color: #95a5be; font-size: 14px; line-height: 1.7; }
.card-list { margin-top: 16px; display: flex; flex-direction: column; gap: 6px; }
.card-list li {
  font-size: 13px; color: #aab8cc;
  padding-left: 18px; position: relative;
}
.card-list li::before {
  content: '▸'; position: absolute; left: 0; color: var(--acc);
}

/* ============ Showcase ============ */
.showcase {
  background: radial-gradient(ellipse at right, #0e1828 0%, #05060a 70%);
}
.showcase-stage {
  max-width: 1400px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px;
  align-items: center;
}
/* === 战术 mock (Canvas + HUD + 数据流) === */
.tac-mock {
  aspect-ratio: 1;
  position: relative;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(0,229,255,0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 80%, rgba(124,93,255,0.08) 0%, transparent 50%),
    linear-gradient(135deg, #04070d 0%, #000 100%);
  border: 1px solid var(--line);
  box-shadow:
    0 30px 80px -20px rgba(0,229,255,0.25),
    inset 0 0 80px rgba(0,229,255,0.06);
  overflow: hidden;
}
.tac-frame { position: absolute; inset: 0; }
.tac-canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  cursor: crosshair;
}

/* HUD 角线 */
.hud-corner {
  position: absolute; width: 28px; height: 28px;
  border: 2px solid var(--acc);
  pointer-events: none;
}
.hud-corner.tl { top: 14px; left: 14px; border-right: none; border-bottom: none; }
.hud-corner.tr { top: 14px; right: 14px; border-left: none; border-bottom: none; }
.hud-corner.bl { bottom: 60px; left: 14px; border-right: none; border-top: none; }
.hud-corner.br { bottom: 60px; right: 14px; border-left: none; border-top: none; }

/* HUD 文本块 */
.tac-hud-tl, .tac-hud-tr, .tac-hud-br {
  position: absolute;
  font-family: 'Orbitron', sans-serif;
  font-size: 11px; color: var(--acc);
  pointer-events: none; z-index: 2;
}
.tac-hud-tl { top: 24px; left: 50px; }
.tac-hud-tr { top: 24px; right: 50px; text-align: right; }
.tac-hud-br { bottom: 80px; right: 28px; text-align: right; }

.hud-label {
  font-size: 9px; letter-spacing: 3px;
  color: var(--muted); margin-bottom: 6px;
}
.hud-row {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 4px; font-size: 11px;
  letter-spacing: 1px;
}
.tac-hud-tr .hud-row { justify-content: flex-end; }
.hud-row b {
  color: var(--muted); font-weight: 500;
  font-size: 10px; letter-spacing: 2px;
}
.hud-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 10px #4ade80;
  animation: pulse 1.2s infinite;
}
.hud-big {
  font-size: 38px; font-weight: 900;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}

/* 底部数据流 */
.tac-stream {
  position: absolute; left: 14px; right: 14px; bottom: 14px;
  height: 36px;
  display: flex; align-items: center; gap: 12px;
  padding: 0 14px;
  border: 1px solid rgba(0,229,255,0.25);
  background: rgba(0,0,0,0.6);
  font-family: 'Orbitron', monospace;
  font-size: 11px; color: var(--acc);
  z-index: 2;
}
.stream-label, .stream-rate {
  flex-shrink: 0; font-weight: 700;
  font-size: 10px; letter-spacing: 2px;
  color: var(--muted);
}
.stream-rate { color: var(--acc); }
.stream-rate span {
  font-size: 13px; font-weight: 900;
  margin-right: 2px;
}
.stream-track {
  flex: 1; overflow: hidden;
  height: 100%; display: flex; align-items: center;
  position: relative;
  mask: linear-gradient(90deg, transparent 0%, #000 8%, #000 92%, transparent 100%);
  -webkit-mask: linear-gradient(90deg, transparent 0%, #000 8%, #000 92%, transparent 100%);
}
.stream-text {
  white-space: nowrap;
  font-family: 'Courier New', monospace;
  font-size: 12px; letter-spacing: 1.5px;
  color: rgba(0,229,255,0.85);
  text-shadow: 0 0 6px rgba(0,229,255,0.5);
}

.showcase-text h3 {
  font-size: 32px; font-weight: 900;
  margin-bottom: 16px; color: #fff;
  font-family: 'Noto Sans SC', sans-serif;
}
.showcase-text p { color: #95a5be; margin-bottom: 24px; line-height: 1.8; }
.showcase-text ul { display: flex; flex-direction: column; gap: 12px; }
.showcase-text li {
  display: flex; align-items: center; gap: 12px;
  color: #aab8cc; font-size: 15px;
}
.dot-g {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--acc); box-shadow: 0 0 8px var(--acc);
}

/* ============ Tech ============ */
.tech { background: #06080e; }
.tech-table {
  max-width: 900px; margin: 0 auto;
  border: 1px solid var(--line);
}
.tech-row {
  display: grid; grid-template-columns: 220px 1fr;
  padding: 22px 28px;
  border-bottom: 1px solid var(--line);
  transition: background .3s;
}
.tech-row:last-child { border-bottom: none; }
.tech-row:hover { background: rgba(0,229,255,0.04); }
.tech-row b {
  color: var(--acc);
  font-family: 'Orbitron', sans-serif;
  font-size: 13px; letter-spacing: 1px;
}
.tech-row span { color: #d8e3f5; font-weight: 500; }

/* ============ Download ============ */
.download {
  background: linear-gradient(180deg, #06080e 0%, #0a1428 50%, #06080e 100%);
  position: relative;
}
.dl-bg {
  position: absolute; inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(0,229,255,0.1) 0%, transparent 60%);
  pointer-events: none;
}
.dl-inner {
  position: relative; max-width: 720px; margin: 0 auto;
  text-align: center;
}
.dl-inner h2 {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 900; line-height: 1.2; margin-bottom: 12px;
}
.dl-inner h2 em {
  font-style: normal;
  background: var(--grad); -webkit-background-clip: text;
  background-clip: text; -webkit-text-fill-color: transparent;
}
.dl-sub { color: var(--muted); margin-bottom: 40px; }

.dl-form {
  display: flex; gap: 12px; flex-wrap: wrap;
  margin-bottom: 16px;
}
.dl-input-wrap {
  flex: 1; min-width: 280px; position: relative;
  border: 1px solid var(--line); background: rgba(0,0,0,0.5);
  display: flex; align-items: center;
  transition: border-color .3s, box-shadow .3s;
}
.dl-input-wrap:focus-within {
  border-color: var(--acc);
  box-shadow: 0 0 24px rgba(0,229,255,0.2);
}
.dl-key-icon {
  margin-left: 14px; color: var(--muted);
  flex-shrink: 0;
}
.dl-input-wrap input {
  flex: 1; padding: 18px 16px;
  background: transparent; border: none; outline: none;
  color: #fff; font-family: 'Rajdhani', monospace;
  font-size: 16px; letter-spacing: 1px;
}
.dl-input-wrap input::placeholder { color: #5a6a82; }

.dl-btn {
  padding: 0 32px; min-width: 180px;
  background: var(--grad); color: #000;
  font-weight: 700; font-size: 16px; letter-spacing: 1px;
  position: relative; overflow: hidden;
  transition: transform .2s, box-shadow .3s;
}
.dl-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0,229,255,0.4);
}
.dl-btn:disabled { opacity: 0.6; cursor: wait; }
.dl-btn-loading { display: none; }
.dl-btn.loading .dl-btn-text { display: none; }
.dl-btn.loading .dl-btn-loading {
  display: inline-flex; align-items: center;
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.dl-result {
  margin-top: 20px; min-height: 24px;
  font-size: 14px;
}
.dl-result.success {
  padding: 16px; background: rgba(74,222,128,0.08);
  border: 1px solid rgba(74,222,128,0.4); color: #4ade80;
}
.dl-result.error {
  padding: 16px; background: rgba(255,56,100,0.08);
  border: 1px solid rgba(255,56,100,0.4); color: #ff6b8e;
}
.dl-result a { color: var(--acc); text-decoration: underline; }

.dl-meta {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px; margin-top: 32px;
  background: var(--line);
  border: 1px solid var(--line);
}
.dl-meta > div {
  padding: 18px; background: var(--bg-2);
  text-align: center;
}
.dl-meta b {
  display: block; color: var(--muted);
  font-size: 11px; letter-spacing: 2px;
  font-family: 'Orbitron', sans-serif;
  margin-bottom: 6px;
}
.dl-meta span { font-size: 14px; font-weight: 600; color: #fff; }

.dl-tips {
  margin-top: 40px; text-align: left;
  padding: 24px; border: 1px dashed var(--line);
  background: rgba(0,0,0,0.3);
}
.dl-tips h4 {
  color: var(--acc); margin-bottom: 12px;
  font-family: 'Orbitron', sans-serif;
  font-size: 13px; letter-spacing: 2px;
}
.dl-tips ol { padding-left: 20px; color: #aab8cc; font-size: 14px; line-height: 1.9; }
.dl-tips ol li { list-style: decimal; }
.dl-tips a { color: var(--acc); }

/* ============ FAQ ============ */
.faq { background: #06080e; }
.faq-list {
  max-width: 900px; margin: 0 auto;
  display: flex; flex-direction: column; gap: 12px;
}
.faq-list details {
  border: 1px solid var(--line);
  background: rgba(11, 14, 22, 0.5);
  transition: border-color .3s;
}
.faq-list details[open] { border-color: var(--acc); }
.faq-list summary {
  padding: 20px 24px; cursor: pointer;
  font-size: 16px; font-weight: 600;
  display: flex; justify-content: space-between; align-items: center;
  list-style: none;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary i {
  font-style: normal; color: var(--acc);
  font-size: 22px; transition: transform .3s;
}
.faq-list details[open] summary i { transform: rotate(45deg); }
.faq-list p {
  padding: 0 24px 20px; color: #95a5be; line-height: 1.8;
  border-top: 1px solid rgba(31,39,52,0.5);
  padding-top: 16px;
}

/* ============ Footer ============ */
.ft {
  padding: 40px 32px; border-top: 1px solid var(--line);
  background: #03050a;
}
.ft-inner {
  max-width: 1400px; margin: 0 auto;
  display: flex; flex-wrap: wrap; gap: 24px;
  justify-content: space-between; align-items: center;
}
.ft-logo { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 14px; }
.ft-logo .logo-mark { color: var(--acc); }
.ft-links { display: flex; gap: 28px; }
.ft-links a { color: var(--muted); font-size: 14px; transition: color .25s; }
.ft-links a:hover { color: var(--acc); }
.ft-warn { color: #5a6a82; font-size: 12px; }

/* ============ Animations ============ */
[data-anim] {
  opacity: 0; transform: translateY(40px);
  transition: opacity .8s ease, transform .8s ease;
}
[data-anim="fade-up"].in { opacity: 1; transform: translateY(0); }
[data-anim="zoom-in"] { transform: scale(0.92); }
[data-anim="zoom-in"].in { opacity: 1; transform: scale(1); }

/* ============ 全局光标光晕 ============ */
.cursor-glow {
  position: fixed; left: 0; top: 0;
  width: 480px; height: 480px;
  margin: -240px 0 0 -240px;
  background: radial-gradient(circle, rgba(0,229,255,0.10) 0%, transparent 60%);
  pointer-events: none; z-index: 1;
  transform: translate3d(-1000px, -1000px, 0);
  transition: opacity .4s;
  mix-blend-mode: screen;
  will-change: transform;
}
@media (max-width: 768px) { .cursor-glow { display: none; } }

/* ============ 顶部滚动进度条 ============ */
.scroll-progress {
  position: fixed; top: 0; left: 0; right: 0;
  height: 2px; z-index: 200;
  background: var(--grad);
  transform-origin: 0 50%;
  transform: scaleX(0);
  box-shadow: 0 0 12px rgba(0,229,255,0.6);
  transition: transform .1s ease-out;
}

/* ============ 右侧节锚 ============ */
.side-rail {
  position: fixed; right: 24px; top: 50%;
  transform: translateY(-50%); z-index: 90;
  display: flex; flex-direction: column; gap: 18px;
}
.side-rail a {
  position: relative;
  width: 28px; height: 28px;
  display: grid; place-items: center;
  cursor: pointer;
}
.side-rail a span {
  width: 8px; height: 8px; border-radius: 50%;
  background: rgba(255,255,255,0.18);
  transition: all .35s cubic-bezier(.2,.7,.3,1.4);
}
.side-rail a:hover span,
.side-rail a.active span {
  background: var(--acc);
  box-shadow: 0 0 12px var(--acc);
  transform: scale(1.4);
}
.side-rail a.active::before {
  content: ''; position: absolute;
  inset: -2px;
  border: 1px solid var(--acc); border-radius: 50%;
  animation: ringPulse 1.6s ease-out infinite;
}
@keyframes ringPulse {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(2.2); opacity: 0; }
}
.side-rail a::after {
  content: attr(data-label);
  position: absolute; right: calc(100% + 12px); top: 50%;
  transform: translateY(-50%) translateX(6px);
  padding: 4px 10px;
  background: rgba(0,229,255,0.95); color: #000;
  font-family: 'Orbitron', sans-serif;
  font-size: 11px; font-weight: 700; letter-spacing: 1px;
  white-space: nowrap; border-radius: 2px;
  opacity: 0; pointer-events: none;
  transition: opacity .25s, transform .25s;
}
.side-rail a:hover::after { opacity: 1; transform: translateY(-50%) translateX(0); }
@media (max-width: 1024px) { .side-rail { display: none; } }

/* ============ 跑马灯 ============ */
.marquee {
  position: relative; overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, #050811, #08111e, #050811);
  padding: 22px 0;
}
.marquee::before, .marquee::after {
  content: ''; position: absolute; top: 0; bottom: 0; width: 120px; z-index: 2;
  pointer-events: none;
}
.marquee::before { left: 0; background: linear-gradient(90deg, #050811, transparent); }
.marquee::after  { right: 0; background: linear-gradient(-90deg, #050811, transparent); }
.marquee-track {
  display: flex; align-items: center; gap: 48px;
  white-space: nowrap; width: max-content;
  animation: marquee 30s linear infinite;
}
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee-track span {
  font-family: 'Orbitron', sans-serif;
  font-size: 36px; font-weight: 900;
  letter-spacing: 4px;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  -webkit-text-stroke: 1px transparent;
  opacity: 0.35;
  transition: opacity .3s;
}
.marquee-track span:hover { opacity: 1; }
.marquee-track i {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--acc);
  box-shadow: 0 0 12px var(--acc);
  flex-shrink: 0;
}
@keyframes marquee {
  to { transform: translateX(-50%); }
}

/* ============ 特性卡 3D 倾斜 ============ */
.feature-card {
  transform-style: preserve-3d;
  transform: perspective(1000px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg));
  transition: transform .15s ease-out, border-color .4s;
  will-change: transform;
}
.feature-card:hover { transform: perspective(1000px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg)) translateY(-6px) translateZ(20px); }
.feature-card .card-icon, .feature-card h3 { transform: translateZ(28px); }

/* 卡片光斑跟随 */
.feature-card::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(400px circle at var(--mx, -200px) var(--my, -200px), rgba(0,229,255,0.13), transparent 50%);
  opacity: 0; transition: opacity .4s;
  pointer-events: none; z-index: 1;
}
.feature-card:hover::before { opacity: 1; }

/* ============ 主 CTA 磁吸 ============ */
.btn-primary { will-change: transform; }

/* ============ Hero parallax helpers ============ */
.hero-content { will-change: transform; }

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .nav-links { display: none; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .feature-card.big { grid-column: span 2; }
  .showcase-stage { grid-template-columns: 1fr; }
  .tac-mock { max-width: 460px; margin: 0 auto; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  section { padding: 80px 20px; }
  .nav-inner { padding: 0 20px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card.big { grid-column: span 1; }
  .dl-meta { grid-template-columns: repeat(2, 1fr); }
  .tech-row { grid-template-columns: 1fr; gap: 6px; }
}