/* ============================================================
   红鲸科技官网 · iredwhale.com
   纯静态 · 零依赖 · 品牌色取自红鲸 logo
   ============================================================ */

:root {
  --red: #CE3831;
  --red-bright: #E04A42;
  --red-dark: #A32722;
  --blue: #2D5FAB;
  --blue-light: #86BFE8;

  --navy-950: #060F1E;
  --navy-900: #081527;
  --navy-800: #0C1F3A;
  --navy-700: #12294D;

  --ink: #13294A;
  --body-c: #4A5A72;
  --muted: #8492A6;
  --line: #E4EAF2;
  --tint: #F5F7FA;
  --white: #FFFFFF;

  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  --container: 1180px;
  --nav-h: 72px;
  --radius: 18px;
  --shadow-md: 0 8px 30px rgba(12, 31, 58, .08);
  --shadow-lg: 0 24px 60px rgba(12, 31, 58, .14);
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  color: var(--body-c);
  background: var(--white);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: 0; background: none; }

.container {
  width: min(var(--container), calc(100% - 48px));
  margin-inline: auto;
}

h1, h2, h3, h4 { color: var(--ink); line-height: 1.28; font-weight: 700; }

::selection { background: rgba(206, 56, 49, .18); }

/* ---------- 入场动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .8s var(--ease) var(--d, 0s), transform .8s var(--ease) var(--d, 0s);
}
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease);
  white-space: nowrap;
}
.btn:active { transform: scale(.97); }
.btn-lg { padding: 15px 34px; font-size: 16px; }

.btn-primary {
  background: linear-gradient(135deg, var(--red-bright), var(--red-dark));
  color: #fff;
  box-shadow: 0 8px 22px rgba(206, 56, 49, .32);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(206, 56, 49, .42); }

.btn-ghost {
  color: #fff;
  border: 1px solid rgba(255, 255, 255, .38);
  background: rgba(255, 255, 255, .06);
  backdrop-filter: blur(6px);
}
.btn-ghost:hover { background: rgba(255, 255, 255, .14); transform: translateY(-2px); }

.btn-light {
  background: #fff;
  color: var(--navy-800);
  box-shadow: 0 8px 22px rgba(0, 0, 0, .25);
}
.btn-light:hover { transform: translateY(-2px); }

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--red);
  font-weight: 600;
  font-size: 15px;
}
.link-more span { transition: transform .25s var(--ease); }
.link-more:hover span { transform: translateX(5px); }

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  transition: background .35s var(--ease), box-shadow .35s var(--ease), border-color .35s var(--ease);
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(255, 255, 255, .86);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom-color: var(--line);
  box-shadow: 0 4px 24px rgba(12, 31, 58, .06);
}

.nav-inner {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: 32px;
}

.brand { display: flex; align-items: center; gap: 11px; }
.brand-logo { width: 36px; height: 36px; }
.brand-wordmark { height: 22px; width: auto; display: block; }
.brand-text {
  display: flex;
  flex-direction: column;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  line-height: 1.15;
  letter-spacing: .5px;
  transition: color .35s var(--ease);
}
.brand-text small {
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 2.4px;
  color: rgba(255, 255, 255, .55);
  transition: color .35s var(--ease);
}
.nav.scrolled .brand-text { color: var(--ink); }
.nav.scrolled .brand-text small { color: var(--muted); }
.brand-text.light { color: #fff; }
.brand-text.light small { color: rgba(255, 255, 255, .5); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}
.nav-links a[data-nav] {
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
  color: rgba(255, 255, 255, .82);
  transition: color .3s, background .3s;
}
.nav-links a[data-nav]:hover { color: #fff; background: rgba(255, 255, 255, .1); }
.nav.scrolled .nav-links a[data-nav] { color: var(--body-c); }
.nav.scrolled .nav-links a[data-nav]:hover,
.nav.scrolled .nav-links a[data-nav].active { color: var(--red); background: rgba(206, 56, 49, .08); }
.nav-links a[data-nav].active { color: #fff; background: rgba(255, 255, 255, .12); }

.nav-cta { margin-left: 8px; padding: 10px 22px; }
.nav-cta-m { display: none; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  margin-left: auto;
}
.nav-toggle span {
  width: 22px; height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all .3s var(--ease);
}
.nav.scrolled .nav-toggle span, .nav.menu-open .nav-toggle span { background: var(--ink); }

.scroll-progress {
  position: absolute;
  left: 0; bottom: -1px;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--red), var(--red-bright));
  transition: width .1s linear;
}

/* ---------- 主视觉 ---------- */
.hero {
  position: relative;
  background:
    radial-gradient(1100px 500px at 78% -10%, rgba(45, 95, 171, .5), transparent 60%),
    linear-gradient(168deg, var(--navy-950) 0%, var(--navy-900) 45%, var(--navy-700) 100%);
  color: #fff;
  padding: calc(var(--nav-h) + clamp(56px, 10vh, 110px)) 0 clamp(120px, 15vh, 170px);
  overflow: hidden;
}
#oceanCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.hero-glow {
  position: absolute;
  width: 560px; height: 560px;
  border-radius: 50%;
  right: -120px; top: 8%;
  background: radial-gradient(circle, rgba(134, 191, 232, .16), transparent 65%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
  align-items: center;
  gap: 48px;
}

.hero-eyebrow {
  font-size: 13px;
  letter-spacing: 3px;
  font-weight: 600;
  color: var(--blue-light);
  margin-bottom: 22px;
}
.hero h1 {
  color: #fff;
  font-size: clamp(2.35rem, 5.2vw, 3.9rem);
  letter-spacing: 1px;
  margin-bottom: 24px;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(120deg, #FF7A6E, var(--red-bright) 55%, #FFB199);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.hero-sub {
  max-width: 560px;
  font-size: 17px;
  color: rgba(255, 255, 255, .78);
  margin-bottom: 38px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* 红鲸浮动 */
.hero-whale {
  position: relative;
  display: grid;
  place-items: center;
}
.whale-svg {
  width: min(340px, 70%);
  overflow: visible; /* 喷水水滴贴着 viewBox 顶边，动画上移时不能被裁切 */
  filter: drop-shadow(0 30px 50px rgba(0, 0, 0, .4));
  animation: whaleFloat 6s ease-in-out infinite;
}
@keyframes whaleFloat {
  0%, 100% { transform: translateY(0) rotate(-1.2deg); }
  50% { transform: translateY(-16px) rotate(1.6deg); }
}
.spout {
  transform-box: fill-box;
  transform-origin: 50% 100%;
  animation: spout 3.2s ease-in-out infinite;
}
.spout-a { animation-delay: .0s; }
.spout-b { animation-delay: .35s; }
.spout-c { animation-delay: .7s; }
@keyframes spout {
  0%, 100% { transform: translateY(0) scale(1); opacity: 1; }
  40% { transform: translateY(-7px) scale(1.12); opacity: .85; }
  60% { transform: translateY(-4px) scale(1.05); }
}
.whale-ring {
  position: absolute;
  bottom: -6%;
  width: 78%;
  aspect-ratio: 3.4 / 1;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(134, 191, 232, .28), transparent 68%);
  animation: ringPulse 6s ease-in-out infinite;
}
@keyframes ringPulse {
  0%, 100% { transform: scale(1); opacity: .8; }
  50% { transform: scale(.86); opacity: .5; }
}

/* 三大业务入口 */
.hero-pillars {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: clamp(56px, 8vh, 90px);
}
.pillar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 22px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, .14);
  background: rgba(255, 255, 255, .06);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform .3s var(--ease), background .3s, border-color .3s;
}
.pillar:hover {
  transform: translateY(-5px);
  background: rgba(255, 255, 255, .11);
  border-color: rgba(255, 255, 255, .3);
}
.pillar-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--blue-light);
  letter-spacing: 1px;
  font-family: var(--mono);
}
.pillar-body { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.pillar-body strong { color: #fff; font-size: 16px; }
.pillar-body small { color: rgba(255, 255, 255, .6); font-size: 12.5px; letter-spacing: .3px; }
.pillar-arrow {
  margin-left: auto;
  color: rgba(255, 255, 255, .5);
  transition: transform .3s var(--ease), color .3s;
}
.pillar:hover .pillar-arrow { transform: translateX(4px); color: var(--red-bright); }

/* ---------- 资质带 ---------- */
.creds {
  background: var(--white);
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
}
.creds-mask, .partners-mask {
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.creds-track {
  display: flex;
  gap: 14px;
  width: max-content;
  animation: marquee 46s linear infinite;
}
.creds-mask:hover .creds-track { animation-play-state: paused; }
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
.cred {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 20px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--tint);
  color: var(--ink);
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
}
.cred i {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 3px rgba(206, 56, 49, .15);
}

/* ---------- 通用 Section ---------- */
.section { padding: clamp(80px, 11vh, 130px) 0; }
.section-tint { background: var(--tint); }

.section-head { max-width: 720px; margin-bottom: clamp(44px, 6vh, 70px); }
.eyebrow {
  font-size: 12.5px;
  letter-spacing: 3px;
  font-weight: 700;
  color: var(--red);
  margin-bottom: 14px;
}
.eyebrow.light { color: var(--blue-light); }
.section-head h2 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); margin-bottom: 16px; }
.section-lede { font-size: 16.5px; color: var(--muted); }
.m-only { display: none; }

/* ---------- 业务板块 ---------- */
.biz { padding: clamp(48px, 7vh, 84px) 0; }
.biz-alt { background: var(--tint); }
.biz-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(40px, 5vw, 76px);
  align-items: center;
}
.biz-grid-flip .biz-copy { order: 2; }
.biz-grid-flip .biz-visual { order: 1; }

.biz-num {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--red);
  letter-spacing: 2px;
  margin-bottom: 10px;
}
.biz h3 { font-size: clamp(1.5rem, 2.6vw, 2rem); margin-bottom: 12px; }
.biz-tagline { font-size: 16.5px; font-weight: 600; color: var(--blue); margin-bottom: 16px; }
.biz-badge {
  display: inline-block;
  padding: 7px 16px;
  border-radius: 999px;
  background: linear-gradient(120deg, rgba(45, 95, 171, .1), rgba(134, 191, 232, .18));
  border: 1px solid rgba(45, 95, 171, .25);
  color: var(--blue);
  font-size: 13.5px;
  font-weight: 700;
  margin-bottom: 18px;
}
.biz-copy > p { margin-bottom: 22px; }

.biz-points { display: grid; gap: 14px; margin-bottom: 28px; }
.biz-points li {
  position: relative;
  padding-left: 26px;
  font-size: 15px;
  color: var(--body-c);
}
.biz-points li::before {
  content: "";
  position: absolute;
  left: 0; top: 9px;
  width: 9px; height: 9px;
  border-radius: 3px;
  background: linear-gradient(135deg, var(--red-bright), var(--red-dark));
  transform: rotate(45deg);
}
.biz-points strong {
  display: block;
  color: var(--ink);
  font-size: 15.5px;
  margin-bottom: 1px;
}

.biz-cta-row { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }

/* 面板通用 */
.panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.panel-caption {
  padding: 14px 22px 18px;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
  border-top: 1px dashed var(--line);
}

/* SDK 流向图 */
.panel-diagram { padding-top: 10px; }
.sdk-diagram { width: 100%; height: auto; }
.sdk-diagram .wire {
  fill: none;
  stroke: #C9D6E8;
  stroke-width: 1.6;
  stroke-dasharray: 5 6;
  animation: wireFlow 1.4s linear infinite;
}
@keyframes wireFlow { to { stroke-dashoffset: -22; } }
.sdk-diagram .node rect { fill: #F2F6FB; stroke: #D4DFEE; stroke-width: 1.4; }
.sdk-diagram .node-ad rect { fill: #FFFFFF; }
.sdk-diagram .node-title { font-size: 17px; font-weight: 700; fill: var(--ink); font-family: var(--font); }
.sdk-diagram .node-title.sm { font-size: 14px; }
.sdk-diagram .node-sub { font-size: 13px; fill: var(--muted); font-family: var(--font); }
.sdk-diagram .node-chips { font-size: 11.5px; fill: var(--muted); letter-spacing: 1px; font-family: var(--font); }
.sdk-diagram .hub-title { font-size: 15px; font-weight: 700; fill: #fff; font-family: var(--font); }
.sdk-diagram rect.hub-rect {
  fill: url(#hubGrad);
  stroke: none;
  filter: drop-shadow(0 6px 14px rgba(206, 56, 49, .35));
}
.sdk-diagram rect.hub-pulse {
  fill: none;
  stroke: var(--red);
  stroke-width: 1.5;
  opacity: 0;
  animation: hubPulse 2.6s ease-out infinite;
  transform-box: fill-box;
  transform-origin: center;
}
@keyframes hubPulse {
  0% { opacity: .7; transform: scale(1); }
  70%, 100% { opacity: 0; transform: scale(1.22); }
}
.sdk-diagram .dot {
  fill: var(--red-bright);
  filter: drop-shadow(0 0 4px rgba(224, 74, 66, .8));
  opacity: 0;
}
@supports (offset-path: path("M0,0 L10,10")) {
  .sdk-diagram .dot { opacity: 1; }
  .dot-in { offset-path: path("M150,190 C 195,190 205,190 240,190"); animation: travel 1.6s linear infinite; fill: var(--blue-light); }
  .dot-o1 { offset-path: path("M330,190 C 380,190 380,80  420,80");  animation: travel 2.2s linear infinite; }
  .dot-o2 { offset-path: path("M330,190 C 380,190 380,153 420,153"); animation: travel 2.2s linear infinite .55s; }
  .dot-o3 { offset-path: path("M330,190 C 380,190 380,227 420,227"); animation: travel 2.2s linear infinite 1.1s; }
  .dot-o4 { offset-path: path("M330,190 C 380,190 380,300 420,300"); animation: travel 2.2s linear infinite 1.65s; }
}
@keyframes travel {
  0% { offset-distance: 0%; opacity: 0; }
  12% { opacity: 1; }
  88% { opacity: 1; }
  100% { offset-distance: 100%; opacity: 0; }
}

/* 窗口面板（微软流程） */
.window-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--line);
  background: #FAFBFD;
}
.window-bar span { width: 11px; height: 11px; border-radius: 50%; background: #E4EAF2; }
.window-bar span:nth-child(1) { background: #FF5F57; }
.window-bar span:nth-child(2) { background: #FEBC2E; }
.window-bar span:nth-child(3) { background: #28C840; }
.window-bar em {
  margin-left: 10px;
  font-style: normal;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: .5px;
}
.window-bar.dark { background: #0D1626; border-bottom-color: rgba(255,255,255,.08); }
.window-bar.dark span { opacity: .9; }
.window-bar.dark em { color: rgba(255,255,255,.45); }

.ms-steps { padding: 18px 22px 10px; display: grid; gap: 4px; }
.ms-steps li {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 11px 14px;
  border-radius: 12px;
  transition: background .4s var(--ease), transform .4s var(--ease);
}
.ms-steps li b {
  flex: none;
  width: 30px; height: 30px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  background: var(--tint);
  border: 1px solid var(--line);
  transition: all .4s var(--ease);
}
.ms-steps li strong { display: block; font-size: 15px; color: var(--ink); line-height: 1.4; }
.ms-steps li small { font-size: 12.5px; color: var(--muted); }
.ms-steps li.active { background: rgba(45, 95, 171, .07); transform: translateX(4px); }
.ms-steps li.active b {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
  box-shadow: 0 0 0 4px rgba(45, 95, 171, .18);
}
.ms-steps li.done b {
  background: rgba(45, 95, 171, .12);
  border-color: transparent;
  color: var(--blue);
}
.ms-progress {
  height: 4px;
  margin: 10px 22px 22px;
  border-radius: 4px;
  background: var(--tint);
  overflow: hidden;
}
.ms-progress span {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--blue), var(--blue-light));
  transition: width .8s var(--ease);
}

/* AI 深色板块 */
.biz-dark {
  background:
    radial-gradient(900px 420px at 12% 0%, rgba(45, 95, 171, .35), transparent 60%),
    linear-gradient(160deg, var(--navy-900), var(--navy-800) 60%, var(--navy-700));
  color: rgba(255, 255, 255, .78);
  padding: clamp(72px, 10vh, 110px) 0;
}
.biz-dark h3 { color: #fff; }
.biz-dark .biz-tagline { color: var(--blue-light); }
.biz-dark .biz-num { color: var(--red-bright); }

.ai-products { display: grid; gap: 14px; margin-bottom: 20px; }
.ai-product {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 20px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, .14);
  background: rgba(255, 255, 255, .05);
  transition: transform .3s var(--ease), background .3s, border-color .3s;
}
.ai-product:hover {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, .09);
  border-color: rgba(134, 191, 232, .5);
}
.ai-product strong {
  color: #fff;
  font-size: 16px;
  letter-spacing: .3px;
}
a.ai-product strong::after {
  content: "↗";
  margin-left: 8px;
  font-size: 13px;
  color: var(--blue-light);
}
.ai-product span { font-size: 13.5px; color: rgba(255, 255, 255, .62); }

.ai-industries {
  font-size: 14px;
  color: rgba(255, 255, 255, .75);
  margin-bottom: 26px;
}
.ai-industries span { color: var(--blue-light); font-weight: 600; }

/* 终端 */
.panel-terminal {
  background: #0B1322;
  border-color: rgba(255, 255, 255, .1);
  box-shadow: 0 30px 70px rgba(0, 0, 0, .5);
}
.terminal {
  padding: 22px 24px 28px;
  min-height: 300px;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.9;
  color: #C8D6EA;
  white-space: pre-wrap;
  word-break: break-all;
}
.terminal .caret {
  display: inline-block;
  width: 8px; height: 16px;
  background: var(--blue-light);
  vertical-align: -2px;
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ---------- 为什么是红鲸 ---------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.why-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 28px;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .35s;
}
.why-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.why-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: var(--red);
  background: linear-gradient(135deg, rgba(206, 56, 49, .1), rgba(206, 56, 49, .04));
  margin-bottom: 20px;
}
.why-icon svg { width: 26px; height: 26px; }
.why-card h3 { font-size: 18px; margin-bottom: 10px; }
.why-card p { font-size: 14.5px; color: var(--body-c); }

/* ---------- 发展历程 ---------- */
.section-dark {
  background:
    radial-gradient(1000px 400px at 85% 110%, rgba(45, 95, 171, .3), transparent 60%),
    linear-gradient(180deg, var(--navy-950), var(--navy-900));
  color: rgba(255, 255, 255, .75);
}
.section-dark h2 { color: #fff; }
.section-dark .section-lede { color: rgba(255, 255, 255, .5); }

.timeline-wrap { position: relative; }
.timeline {
  display: flex;
  gap: 0;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  padding: 20px max(calc((100vw - var(--container)) / 2), 24px) 36px;
  scroll-padding-inline: max(calc((100vw - var(--container)) / 2), 24px);
  cursor: grab;
  scrollbar-width: none;
}
.timeline::-webkit-scrollbar { display: none; }
.timeline.dragging { cursor: grabbing; scroll-snap-type: none; }

.tl-item {
  position: relative;
  flex: 0 0 300px;
  padding: 0 34px 0 0;
  scroll-snap-align: start;
  user-select: none;
}
.tl-item::before {
  content: "";
  position: absolute;
  left: 0; right: 0;
  top: 86px;
  height: 1px;
  background: linear-gradient(90deg, rgba(134, 191, 232, .35), rgba(134, 191, 232, .12));
}
.tl-year {
  display: block;
  font-family: var(--mono);
  font-size: 40px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 1px;
  margin-bottom: 18px;
}
.tl-dot {
  position: absolute;
  top: 80px;
  left: 0;
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--navy-900);
  border: 3px solid var(--blue-light);
  box-shadow: 0 0 0 5px rgba(134, 191, 232, .12);
}
.tl-item p {
  margin-top: 40px;
  font-size: 14.5px;
  color: rgba(255, 255, 255, .68);
  max-width: 250px;
}
.tl-now .tl-year {
  background: linear-gradient(120deg, #FF7A6E, var(--red-bright));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.tl-now .tl-dot {
  border-color: var(--red-bright);
  box-shadow: 0 0 0 5px rgba(224, 74, 66, .2);
  animation: nowPulse 2.4s ease-out infinite;
}
@keyframes nowPulse {
  0% { box-shadow: 0 0 0 4px rgba(224, 74, 66, .3); }
  70%, 100% { box-shadow: 0 0 0 12px rgba(224, 74, 66, 0); }
}
.tl-now p { color: #fff; }

.tl-nav {
  display: flex;
  gap: 12px;
  width: min(var(--container), calc(100% - 48px));
  margin: 4px auto 0;
}
.tl-btn {
  width: 46px; height: 46px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, .22);
  color: #fff;
  font-size: 17px;
  transition: all .3s var(--ease);
}
.tl-btn:hover { background: rgba(255, 255, 255, .1); border-color: rgba(255, 255, 255, .5); }

/* ---------- 合作生态 ---------- */
.partners-track {
  display: flex;
  gap: 18px;
  width: max-content;
  animation: marquee 38s linear infinite;
  padding: 6px 0;
}
.partners-mask:hover .partners-track { animation-play-state: paused; }
.partner {
  padding: 20px 40px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #fff;
  font-size: 17px;
  font-weight: 700;
  color: #9AA7B8;
  white-space: nowrap;
  letter-spacing: .5px;
  transition: color .3s, border-color .3s, transform .3s var(--ease), box-shadow .3s;
}
.partner:hover {
  color: var(--ink);
  border-color: #CBD6E4;
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.partners-note {
  text-align: center;
  font-size: 12.5px;
  color: var(--muted);
  margin-top: 26px;
}

/* ---------- 联系我们 ---------- */
.section-contact { padding-bottom: clamp(80px, 11vh, 120px); }
.contact-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, .6fr);
  gap: 40px;
  align-items: center;
  padding: clamp(40px, 6vw, 72px);
  border-radius: 28px;
  overflow: hidden;
  background:
    radial-gradient(700px 300px at 100% 0%, rgba(134, 191, 232, .2), transparent 55%),
    linear-gradient(135deg, var(--navy-800), var(--navy-700));
  color: rgba(255, 255, 255, .78);
  box-shadow: var(--shadow-lg);
}
.contact-card h2 { color: #fff; font-size: clamp(1.6rem, 3vw, 2.3rem); margin-bottom: 16px; }
.contact-card > .contact-copy > p { max-width: 480px; margin-bottom: 30px; }

.contact-list { display: grid; gap: 16px; }
.contact-list li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
}
.contact-label {
  flex: none;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--blue-light);
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid rgba(134, 191, 232, .35);
}
.contact-list a {
  font-size: 17px;
  font-weight: 600;
  color: #fff;
  border-bottom: 1px dashed rgba(255, 255, 255, .3);
  transition: border-color .3s, color .3s;
}
.contact-list a:hover { color: var(--blue-light); border-bottom-color: var(--blue-light); }
.contact-list span:not(.contact-label) { font-size: 15px; }

.contact-whale { display: grid; place-items: center; }
.contact-whale img {
  width: min(220px, 80%);
  opacity: .95;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, .35));
  animation: whaleFloat 7s ease-in-out infinite;
}

/* ---------- 页脚 ---------- */
.footer {
  background: var(--navy-950);
  color: rgba(255, 255, 255, .55);
  padding: 64px 0 0;
  font-size: 14px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer-brand p { margin-top: 18px; max-width: 260px; }
.footer-col { display: flex; flex-direction: column; gap: 12px; }
.footer-col h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 6px;
}
.footer-col a { transition: color .25s; }
.footer-col a:hover { color: #fff; }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 22px 0 28px;
  border-top: 1px solid rgba(255, 255, 255, .08);
  font-size: 13px;
  color: rgba(255, 255, 255, .38);
}
.footer-bottom a:hover { color: #fff; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-whale { display: none; }
  .hero-sub { max-width: 640px; }
}

@media (max-width: 820px) {
  .m-only { display: inline; }

  .nav-toggle { display: flex; }
  .nav-cta { display: none; }
  .nav-cta-m { display: inline-flex; margin-top: 10px; align-self: flex-start; }
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    margin: 0;
    padding: 18px 24px 26px;
    background: rgba(255, 255, 255, .97);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 30px 40px rgba(12, 31, 58, .12);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .3s var(--ease), transform .3s var(--ease);
  }
  .nav.menu-open .nav-links { opacity: 1; transform: none; pointer-events: auto; }
  .nav.menu-open { background: #fff; border-bottom-color: var(--line); }
  .nav.menu-open .brand-text { color: var(--ink); }
  .nav.menu-open .brand-text small { color: var(--muted); }
  .nav-links a[data-nav] { color: var(--ink) !important; font-size: 16px; padding: 12px 14px; }
  .nav.menu-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav.menu-open .nav-toggle span:nth-child(2) { opacity: 0; }
  .nav.menu-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .hero-pillars { grid-template-columns: 1fr; gap: 12px; }
  .biz-grid { grid-template-columns: 1fr; gap: 34px; }
  .biz-grid-flip .biz-copy { order: 1; }
  .biz-grid-flip .biz-visual { order: 2; }
  .contact-card { grid-template-columns: 1fr; }
  .contact-whale { display: none; }
  .tl-item { flex: 0 0 260px; }
}

@media (max-width: 560px) {
  body { font-size: 15px; }
  .container { width: calc(100% - 40px); }
  .why-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .hero-actions .btn { flex: 1; }
  .terminal { min-height: 260px; font-size: 12.5px; }
  .contact-list a { font-size: 15px; word-break: break-all; }
}