/* ============ 公开着陆页 · 潜航叙事 ============ */
html { scroll-behavior: smooth; }
body.landing { background: var(--navy-950); overflow-x: hidden; }

/* ---------- 海图纸经纬底纹 + 深潜渐暗 ---------- */
.sea {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(138, 230, 232, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(138, 230, 232, 0.045) 1px, transparent 1px);
  background-size: 72px 72px;
}
.sea::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(1100px 520px at 72% -8%, rgba(47, 191, 196, 0.09), transparent 62%);
}
/* 海洋悬浮微粒 */
.sea .mote {
  position: absolute; width: 3px; height: 3px; border-radius: 50%;
  background: rgba(138, 230, 232, 0.35);
  animation: mote-drift linear infinite;
}
@keyframes mote-drift {
  from { transform: translateY(105vh); opacity: 0; }
  12% { opacity: 0.6; }
  88% { opacity: 0.5; }
  to { transform: translateY(-8vh); opacity: 0; }
}

.landing main { position: relative; z-index: 1; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 28px; }

/* ---------- 顶部导航 ---------- */
.lnav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(7, 21, 39, 0.72);
  border-bottom: 1px solid var(--line-dark-2);
}
.lnav__inner { max-width: 1120px; margin: 0 auto; padding: 12px 28px; display: flex; align-items: center; gap: 26px; }
.lnav__brand { display: flex; align-items: center; gap: 10px; }
.lnav__brand img { width: 30px; height: 30px; border-radius: 7px; }
.lnav__brand .cn { font-size: 15px; font-weight: 700; letter-spacing: 1px; line-height: 1; }
.lnav__links { display: flex; gap: 4px; margin-left: auto; }
.lnav__links a { padding: 7px 13px; border-radius: var(--radius-md); font-size: 13px; color: var(--text-mid); }
.lnav__links a:hover { color: var(--text-hi); background: var(--navy-850); }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-radius: var(--radius-md);
  font-size: 14px; font-weight: 600; transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}
.btn--primary {
  background: var(--sonar-500); color: #04222b;
  box-shadow: 0 0 0 1px rgba(79, 214, 218, 0.4), 0 4px 18px rgba(47, 191, 196, 0.25);
}
.btn--primary:hover { transform: translateY(-1px); background: var(--sonar-400); }
.btn--ghost { border: 1px solid var(--line-dark-2); color: var(--text-mid); }
.btn--ghost:hover { color: var(--sonar-400); border-color: rgba(47, 191, 196, 0.45); }
.btn--sm { padding: 8px 16px; font-size: 13px; }

/* ---------- 潜深标尺（右缘滚动进度） ---------- */
.depth-gauge {
  position: fixed; right: 22px; top: 50%; transform: translateY(-50%);
  z-index: 15; display: flex; flex-direction: column; gap: 30px;
}
.depth-gauge::before {
  content: ""; position: absolute; left: 3.5px; top: 6px; bottom: 6px;
  width: 1px; background: var(--line-dark-2);
}
.depth-stop { position: relative; display: flex; align-items: center; gap: 10px; cursor: pointer; }
.depth-stop .tick { width: 8px; height: 8px; border-radius: 50%; background: var(--navy-700); border: 1px solid var(--line-dark-2); transition: background 0.25s, box-shadow 0.25s; }
.depth-stop .lbl {
  position: absolute; right: 18px; white-space: nowrap;
  font-family: var(--font-mono); font-size: 10.5px; color: var(--text-low);
  opacity: 0; transform: translateX(4px); transition: opacity 0.2s, transform 0.2s;
}
.depth-stop:hover .lbl { opacity: 1; transform: none; }
.depth-stop.is-active .tick { background: var(--sonar-500); box-shadow: 0 0 10px rgba(47, 191, 196, 0.7); }
.depth-stop.is-active .lbl { opacity: 1; transform: none; color: var(--sonar-400); }

/* ---------- Hero ---------- */
.hero { min-height: 100vh; display: flex; align-items: center; padding: 110px 0 60px; }
.hero__grid { display: grid; grid-template-columns: minmax(0, 1fr) 460px; gap: 48px; align-items: center; }
.hero__quote { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--sonar-400); letter-spacing: 2px; }
.hero__quote::before { content: ""; width: 26px; height: 1px; background: var(--sonar-500); }
.hero__title { margin-top: 18px; font-size: 52px; line-height: 1.22; font-weight: 700; letter-spacing: 2px; }
.hero__title .glow { color: var(--sonar-400); text-shadow: 0 0 26px rgba(47, 191, 196, 0.45); }
.hero__sub { margin-top: 20px; max-width: 520px; font-size: 15px; line-height: 1.9; color: var(--text-mid); }
.hero__cta { margin-top: 32px; display: flex; gap: 14px; }
.hero__stats { margin-top: 46px; display: flex; gap: 38px; }
.hero-stat .num { font-family: var(--font-mono); font-size: 25px; font-weight: 700; color: var(--sonar-300); }
.hero-stat .num small { font-size: 14px; margin-left: 2px; color: var(--text-mid); }
.hero-stat .lbl { margin-top: 4px; font-size: 12px; color: var(--text-low); }

/* 声呐罗盘 */
.scope { position: relative; width: 460px; height: 460px; }
.scope__disc {
  position: absolute; inset: 0; border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 191, 196, 0.1), rgba(7, 21, 39, 0.6) 74%);
  border: 1px solid rgba(47, 191, 196, 0.4);
  box-shadow: 0 0 60px rgba(47, 191, 196, 0.12), inset 0 0 60px rgba(7, 21, 39, 0.6);
}
.scope__ring { position: absolute; border-radius: 50%; border: 1px solid rgba(47, 191, 196, 0.2); }
.scope__ring--1 { inset: 17%; }
.scope__ring--2 { inset: 34%; }
.scope__ring--3 { inset: 8%; border-style: dashed; border-color: rgba(47, 191, 196, 0.14); }
.scope__cross-h, .scope__cross-v { position: absolute; background: rgba(47, 191, 196, 0.16); }
.scope__cross-h { left: 4%; right: 4%; top: 50%; height: 1px; }
.scope__cross-v { top: 4%; bottom: 4%; left: 50%; width: 1px; }
.scope__sweep {
  position: absolute; inset: 1px; border-radius: 50%;
  background: conic-gradient(from 0deg, rgba(79, 214, 218, 0.5), rgba(79, 214, 218, 0.07) 14%, transparent 24%);
  animation: sonar-sweep 7s linear infinite;
  mix-blend-mode: screen;
}
.scope__deg { position: absolute; font-family: var(--font-mono); font-size: 10px; color: rgba(138, 230, 232, 0.4); }
.scope__center {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  display: flex; flex-direction: column; align-items: center; gap: 5px; text-align: center;
}
.scope__center .core {
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--sonar-400); box-shadow: 0 0 16px rgba(79, 214, 218, 0.9);
}
.scope__center .who { font-size: 11.5px; color: var(--text-mid); letter-spacing: 1px; }

/* 回波点：延迟与扫描角同步 */
.blip { position: absolute; left: 50%; top: 50%; }
.blip__dot {
  position: absolute; width: 9px; height: 9px; margin: -4.5px;
  border-radius: 50%; background: var(--amber-400);
  opacity: 0.25; animation: blip-flash 7s linear infinite; animation-delay: var(--d);
}
.blip__dot::after {
  content: ""; position: absolute; inset: -7px; border-radius: 50%;
  border: 1px solid var(--amber-400); opacity: 0;
  animation: blip-echo 7s linear infinite; animation-delay: var(--d);
}
.blip__tag {
  position: absolute; left: 11px; top: -9px; white-space: nowrap;
  font-size: 11px; color: var(--amber-400);
  background: rgba(7, 21, 39, 0.82); border: 1px solid rgba(217, 164, 65, 0.35);
  padding: 2px 8px; border-radius: 9px;
  opacity: 0; animation: blip-tag 7s linear infinite; animation-delay: var(--d);
}
.blip--good .blip__dot, .blip--good .blip__dot::after { background-color: var(--ok-500); border-color: var(--ok-500); }
.blip--good .blip__tag { color: var(--ok-500); border-color: rgba(63, 174, 122, 0.35); }
@keyframes blip-flash { 0%, 2% { opacity: 1; box-shadow: 0 0 14px currentColor; } 26% { opacity: 0.25; box-shadow: none; } 100% { opacity: 0.25; } }
@keyframes blip-echo { 0% { opacity: 0.9; transform: scale(0.4); } 18% { opacity: 0; transform: scale(2.1); } 100% { opacity: 0; } }
@keyframes blip-tag { 0%, 2% { opacity: 1; transform: none; } 42% { opacity: 1; } 54%, 100% { opacity: 0; transform: translateY(2px); } }

/* ---------- 通用 section ---------- */
.sect { padding: 96px 0; position: relative; }
.sect__kicker { font-family: var(--font-mono); font-size: 12px; color: var(--sonar-400); letter-spacing: 3px; }
.sect__title { margin-top: 10px; font-size: 30px; font-weight: 700; letter-spacing: 1.5px; }
.sect__sub { margin-top: 12px; font-size: 14px; color: var(--text-mid); line-height: 1.8; max-width: 640px; }

/* 滚动浮现 */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- 痛点：声呐回波卡 ---------- */
.pains { margin-top: 44px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.pain {
  position: relative; padding: 20px 22px; border-radius: var(--radius-lg);
  background: var(--navy-900); border: 1px solid var(--line-dark-2);
  overflow: hidden; transition: border-color 0.2s, transform 0.2s;
}
.pain:hover { border-color: rgba(217, 164, 65, 0.4); transform: translateY(-2px); }
.pain__no { font-family: var(--font-mono); font-size: 12px; color: var(--amber-400); }
.pain__name { margin-top: 6px; font-size: 16px; font-weight: 700; }
.pain__txt { margin-top: 8px; font-size: 13px; line-height: 1.8; color: var(--text-mid); }
.pain::after {
  content: ""; position: absolute; right: -34px; top: -34px; width: 96px; height: 96px;
  border-radius: 50%; border: 1px solid rgba(217, 164, 65, 0.18);
  box-shadow: inset 0 0 0 18px rgba(217, 164, 65, 0.04);
}
.pain--wide { grid-column: 1 / -1; }

/* ---------- 模块舱段 ---------- */
.mods { margin-top: 44px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.mod {
  display: block; padding: 22px; border-radius: var(--radius-lg);
  background: var(--navy-900); border: 1px solid var(--line-dark-2);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.mod:hover {
  border-color: rgba(47, 191, 196, 0.5); transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(3, 10, 20, 0.5), 0 0 0 1px rgba(47, 191, 196, 0.12);
}
.mod__icon {
  width: 38px; height: 38px; border-radius: var(--radius-md);
  background: var(--sonar-dim); color: var(--sonar-400);
  display: flex; align-items: center; justify-content: center;
}
.mod__name { margin-top: 14px; font-size: 15.5px; font-weight: 700; }
.mod__txt { margin-top: 8px; font-size: 12.5px; line-height: 1.75; color: var(--text-mid); }
.mod__go { margin-top: 12px; font-size: 12px; color: var(--sonar-400); opacity: 0; transform: translateX(-4px); transition: opacity 0.2s, transform 0.2s; }
.mod:hover .mod__go { opacity: 1; transform: none; }

/* ---------- AI 能力：语义声呐 ---------- */
.ai-band { margin-top: 44px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.ai-item {
  position: relative; display: block; padding: 20px 22px 20px 26px; border-radius: var(--radius-lg);
  background: var(--navy-900); border: 1px solid var(--line-dark-2); overflow: hidden;
  text-decoration: none; color: inherit; transition: border-color 0.2s;
}
.ai-item::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: linear-gradient(180deg, var(--sonar-500), rgba(47, 191, 196, 0.1));
}
.ai-item__name { font-size: 15px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.ai-item__name .icon { color: var(--sonar-400); }
.ai-item:hover { border-color: rgba(47, 191, 196, 0.35); }
.ai-item__txt { margin-top: 8px; font-size: 12.5px; line-height: 1.8; color: var(--text-mid); }
.ai-item__go { margin-top: 10px; font-size: 12px; color: var(--sonar-400); }
.ai-item .scanline {
  position: absolute; left: 0; right: 0; height: 40px; top: -40px;
  background: linear-gradient(180deg, transparent, rgba(47, 191, 196, 0.07), transparent);
  animation: scan-down 4.5s ease-in-out infinite; animation-delay: var(--d, 0s);
  pointer-events: none;
}
@keyframes scan-down { 0%, 55% { top: -40px; } 90%, 100% { top: 110%; } }
.ai-note { margin-top: 18px; font-size: 12.5px; color: var(--text-low); }
.ai-note b { color: var(--amber-400); font-weight: 600; }

/* ---------- 成效指标 ---------- */
.metrics { margin-top: 44px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.metric {
  padding: 24px 20px; text-align: center; border-radius: var(--radius-lg);
  background: var(--navy-900); border: 1px solid var(--line-dark-2);
}
.metric__num { font-family: var(--font-mono); font-size: 38px; font-weight: 700; color: var(--sonar-300); }
.metric__num small { font-size: 17px; color: var(--text-mid); margin-left: 2px; }
.metric__num .arrow { color: var(--text-low); font-size: 22px; margin: 0 4px; }
.metric__lbl { margin-top: 8px; font-size: 12.5px; color: var(--text-mid); }

/* ---------- 产品预览 ---------- */
.preview { margin-top: 48px; perspective: 1300px; }
.preview__frame {
  border-radius: 14px; overflow: hidden;
  border: 1px solid rgba(47, 191, 196, 0.28);
  box-shadow: 0 30px 80px rgba(2, 8, 16, 0.7), 0 0 0 1px rgba(7, 21, 39, 0.8), 0 0 44px rgba(47, 191, 196, 0.1);
  transform: rotateX(6deg); transform-origin: center top;
  transition: transform 0.5s ease;
}
.preview:hover .preview__frame { transform: rotateX(0deg); }
.preview__bar {
  display: flex; align-items: center; gap: 6px;
  padding: 10px 14px; background: var(--navy-850); border-bottom: 1px solid var(--line-dark-2);
}
.preview__bar i { width: 9px; height: 9px; border-radius: 50%; background: var(--navy-600); }
.preview__bar .url {
  margin-left: 12px; flex: 1; text-align: center;
  font-family: var(--font-mono); font-size: 11px; color: var(--text-low);
  background: var(--navy-900); border-radius: 5px; padding: 3px 0;
}
.preview__frame img { display: block; width: 100%; }

/* ---------- CTA 深处 ---------- */
.abyss { padding: 110px 0 90px; text-align: center; position: relative; }
.abyss::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(640px 300px at 50% 62%, rgba(47, 191, 196, 0.1), transparent 68%);
}
.abyss__title { font-size: 34px; font-weight: 700; letter-spacing: 2px; }
.abyss__sub { margin-top: 14px; font-size: 14px; color: var(--text-mid); }
.abyss__cta { margin-top: 32px; display: flex; justify-content: center; gap: 14px; }

/* ---------- 页脚（合规与边界） ---------- */
.lfoot { border-top: 1px solid var(--line-dark-2); padding: 38px 0 44px; position: relative; z-index: 1; }
.lfoot__grid { display: flex; gap: 44px; align-items: flex-start; }
.lfoot__brand { flex: none; display: flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 700; }
.lfoot__brand img { width: 26px; height: 26px; border-radius: 6px; }
.lfoot ul { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 30px; }
.lfoot li { font-size: 12px; color: var(--text-low); line-height: 1.7; display: flex; gap: 8px; }
.lfoot li::before { content: "▪"; color: var(--sonar-500); font-size: 9px; line-height: 2.4; }
.lfoot__meta { margin-top: 26px; font-size: 11.5px; color: var(--text-low); display: flex; justify-content: space-between; }

/* ---------- 响应式 ---------- */
@media (max-width: 1020px) {
  .hero__grid { grid-template-columns: 1fr; }
  .scope { margin: 0 auto; width: 380px; height: 380px; }
  .mods, .metrics { grid-template-columns: repeat(2, 1fr); }
  .depth-gauge { display: none; }
}
@media (max-width: 640px) {
  .hero__title { font-size: 36px; }
  .pains, .ai-band, .mods, .metrics { grid-template-columns: 1fr; }
  .lfoot__grid { flex-direction: column; }
}