:root {
  --deep: #062a63;
  --deep-2: #0a3d91;
  --blue: #1a6fd4;
  --azure: #2f95e6;
  --cyan: #6fd0e8;
  --foam: #eaf6ff;
  --ink: #0b1f3a;
  --text: #12233f;
  --text-soft: #5b7089;
  --text-faint: #8aa0b8;
  --line: rgba(20, 80, 160, 0.12);
  --card: rgba(255, 255, 255, 0.72);
  --card-solid: #ffffff;
  --radius: 18px;
  --radius-lg: 26px;
  --shadow: 0 12px 40px rgba(10, 61, 145, 0.1);
  --shadow-hover: 0 22px 70px rgba(10, 61, 145, 0.2);
  --maxw: 1200px;
  --header-h: 64px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Hiragino Sans", "Yu Gothic", "Malgun Gothic", "Apple SD Gothic Neo",
    "Noto Sans CJK SC", "Noto Sans JP", "Noto Sans KR",
    Helvetica, Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  color: var(--text);
  line-height: 1.6;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: linear-gradient(180deg, #f2f9ff 0%, #eaf4ff 40%, #dcecff 100%);
  overflow-x: hidden;
}

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

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 820px; }

/* ============ 海洋背景动画 ============ */
.ocean {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(111, 208, 232, 0.35), transparent 60%),
    radial-gradient(1000px 700px at 10% 110%, rgba(10, 61, 145, 0.28), transparent 60%),
    linear-gradient(180deg, #eaf6ff 0%, #bfe0ff 45%, #7fb6ee 100%);
}
.ocean-light {
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 70%;
  background:
    conic-gradient(from 200deg at 30% 0%, rgba(255,255,255,0.5), transparent 25%),
    conic-gradient(from 160deg at 70% 0%, rgba(255,255,255,0.4), transparent 22%);
  filter: blur(20px);
  opacity: 0.7;
  animation: shimmer 12s ease-in-out infinite;
}
@keyframes shimmer {
  0%, 100% { transform: translateX(-2%) skewX(-2deg); opacity: 0.55; }
  50% { transform: translateX(2%) skewX(2deg); opacity: 0.85; }
}

.bubbles { position: absolute; inset: 0; }
.bubbles span {
  position: absolute;
  bottom: -40px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.9), rgba(255,255,255,0.15) 60%, transparent 70%);
  box-shadow: inset 0 0 6px rgba(255,255,255,0.6);
  animation: rise linear infinite;
  opacity: 0;
}
@keyframes rise {
  0% { transform: translateY(0) translateX(0) scale(0.8); opacity: 0; }
  10% { opacity: 0.8; }
  90% { opacity: 0.6; }
  100% { transform: translateY(-110vh) translateX(30px) scale(1.1); opacity: 0; }
}

.whale {
  position: absolute;
  bottom: 6%;
  left: -260px;
  width: 300px;
  opacity: 0.5;
  filter: drop-shadow(0 20px 30px rgba(6, 42, 99, 0.3));
  animation: swim 34s linear infinite;
}
@keyframes swim {
  0% { transform: translateX(0) translateY(0) rotate(-2deg); }
  50% { transform: translateX(60vw) translateY(-28px) rotate(2deg); }
  100% { transform: translateX(120vw) translateY(0) rotate(-2deg); }
}

/* ============ 导航 ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 100;
  display: flex;
  align-items: center;
  transition: background 0.4s var(--ease), box-shadow 0.4s var(--ease), backdrop-filter 0.4s;
}
.nav.scrolled {
  background: rgba(240, 248, 255, 0.72);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  box-shadow: 0 1px 0 var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo { width: 34px; height: 34px; border-radius: 9px; box-shadow: 0 4px 14px rgba(10,61,145,0.25); }
.brand-name { font-weight: 700; font-size: 20px; letter-spacing: 0.04em; color: var(--deep-2); }
.nav-links { display: flex; gap: 28px; }
.nav-links a { font-size: 15px; color: var(--text-soft); font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--deep-2); }
.nav-actions { display: flex; align-items: center; gap: 12px; flex: none; }

/* ============ 语言切换 ============ */
.lang-switcher { position: relative; z-index: 120; }
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 980px;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line);
  color: var(--deep-2);
  font-size: 13px;
  font-weight: 600;
  backdrop-filter: blur(8px);
  transition: background 0.2s, box-shadow 0.2s, transform 0.2s;
}
.lang-toggle:hover {
  background: #fff;
  box-shadow: 0 6px 18px rgba(10, 61, 145, 0.12);
}
.lang-toggle svg { flex: none; opacity: 0.85; }
.lang-chev { transition: transform 0.25s var(--ease); opacity: 0.7; }
.lang-switcher.open .lang-chev { transform: rotate(180deg); }
.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 168px;
  padding: 6px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(20, 80, 160, 0.12);
  box-shadow: 0 16px 40px rgba(10, 61, 145, 0.18);
  backdrop-filter: blur(16px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s;
}
.lang-switcher.open .lang-menu {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.lang-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 9px 12px;
  border-radius: 10px;
  text-align: left;
  font-size: 14px;
  color: var(--text);
  transition: background 0.15s;
}
.lang-option:hover { background: rgba(47, 149, 230, 0.1); }
.lang-option.active {
  background: rgba(26, 111, 212, 0.12);
  color: var(--deep-2);
  font-weight: 600;
}
.lang-option-short {
  width: 28px;
  flex: none;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--azure);
}
.lang-option-label { flex: 1; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 980px;
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease),
    background 0.25s var(--ease), opacity 0.2s;
  white-space: nowrap;
}
.btn-sm { padding: 9px 18px; font-size: 14px; }
.btn-lg { padding: 15px 34px; font-size: 16px; }
.btn svg { width: 18px; height: 18px; flex: none; }
.btn-primary {
  background: linear-gradient(135deg, var(--azure), var(--deep-2));
  color: #fff;
  box-shadow: 0 10px 30px rgba(10, 61, 145, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px rgba(10, 61, 145, 0.45); }
.btn-ghost {
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--line);
  color: var(--deep-2);
  backdrop-filter: blur(6px);
}
.btn-ghost:hover { background: #fff; transform: translateY(-2px); }
.btn[disabled], .btn.disabled { opacity: 0.5; pointer-events: none; }

/* ============ 通用文字 ============ */
.eyebrow {
  font-size: 13px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--azure);
  font-weight: 700;
}
.h1 { font-size: clamp(38px, 7vw, 82px); font-weight: 800; line-height: 1.02; letter-spacing: -0.02em; }
.h2 { font-size: clamp(28px, 4.4vw, 50px); font-weight: 800; line-height: 1.08; letter-spacing: -0.02em; color: var(--ink); }
.lead { font-size: clamp(16px, 2vw, 20px); color: var(--text-soft); font-weight: 400; }

.section { padding: 96px 0; position: relative; }
.section-soft { background: rgba(255, 255, 255, 0.45); backdrop-filter: blur(4px); }
.section-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.section-head .eyebrow { margin-bottom: 14px; display: block; }
.section-head .h2 { margin-bottom: 16px; }

/* ============ Hero ============ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: var(--header-h);
  text-align: center;
}
.hero-inner { display: flex; flex-direction: column; align-items: center; }
.hero-logo {
  width: 120px; height: 120px;
  border-radius: 28px;
  margin-bottom: 26px;
  box-shadow: 0 20px 60px rgba(10, 61, 145, 0.35);
  animation: floaty 6s ease-in-out infinite;
}
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.hero .eyebrow { margin-bottom: 16px; }
.hero-title {
  font-size: clamp(40px, 8vw, 88px);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #0a3d91 0%, #2f95e6 55%, #6fd0e8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 20px;
}
.hero-sub { font-size: clamp(16px, 2.2vw, 22px); color: var(--text-soft); max-width: 620px; margin-bottom: 34px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; margin-bottom: 22px; }
.hero-note { font-size: 14px; color: var(--text-faint); letter-spacing: 0.03em; }

.wave-wrap { position: absolute; bottom: 0; left: 0; right: 0; line-height: 0; pointer-events: none; }
.wave-svg { width: 100%; height: 110px; }
.wave { fill: rgba(255, 255, 255, 0.55); }
.wave-1 { animation: waveMove 14s ease-in-out infinite alternate; }
.wave-2 { fill: rgba(255, 255, 255, 0.85); animation: waveMove 10s ease-in-out infinite alternate-reverse; }
@keyframes waveMove {
  0% { transform: translateX(-3%); }
  100% { transform: translateX(3%); }
}

/* ============ 下载卡片 ============ */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
  max-width: 960px;
  margin: 0 auto;
}
.dl-card {
  position: relative;
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-lg);
  padding: 30px 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
  overflow: hidden;
}
.dl-card::before {
  content: "";
  position: absolute;
  top: -40%; right: -30%;
  width: 220px; height: 220px;
  background: radial-gradient(circle, rgba(111, 208, 232, 0.35), transparent 70%);
  border-radius: 50%;
}
.dl-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.dl-icon {
  width: 54px; height: 54px;
  border-radius: 15px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--azure), var(--deep-2));
  color: #fff;
  margin-bottom: 18px;
  position: relative;
}
.dl-icon svg { width: 30px; height: 30px; }
.dl-title { font-size: 21px; font-weight: 700; color: var(--ink); margin-bottom: 4px; }
.dl-meta { font-size: 13px; color: var(--text-faint); margin-bottom: 18px; display: flex; gap: 12px; flex-wrap: wrap; }
.dl-meta span { display: inline-flex; align-items: center; gap: 5px; }
.dl-desc { font-size: 14px; color: var(--text-soft); margin-bottom: 22px; min-height: 42px; }
.dl-card .btn { width: 100%; }
.badge-soon {
  position: absolute; top: 22px; right: 22px;
  font-size: 11px; font-weight: 700; letter-spacing: 0.08em;
  padding: 4px 10px; border-radius: 999px;
  background: rgba(10, 61, 145, 0.1); color: var(--deep-2);
}

.notice {
  margin: 40px auto 0;
  max-width: 720px;
  display: flex; align-items: center; gap: 12px;
  padding: 16px 20px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px dashed rgba(10, 61, 145, 0.3);
  color: var(--text-soft);
  font-size: 14px;
  text-align: left;
}
.notice-dot {
  flex: none;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--azure);
  box-shadow: 0 0 0 0 rgba(47, 149, 230, 0.5);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(47, 149, 230, 0.5); }
  70% { box-shadow: 0 0 0 10px rgba(47, 149, 230, 0); }
  100% { box-shadow: 0 0 0 0 rgba(47, 149, 230, 0); }
}

/* ============ 特性 ============ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius);
  padding: 28px 24px;
  backdrop-filter: blur(10px);
  transition: transform 0.35s var(--ease);
}
.feature-card:hover { transform: translateY(-5px); }
.feature-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 16px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0a3d91;
  background: linear-gradient(145deg, rgba(47, 123, 214, 0.14), rgba(10, 61, 145, 0.06));
  border: 1px solid rgba(47, 123, 214, 0.18);
}
.feature-icon svg {
  width: 22px;
  height: 22px;
  display: block;
}
.feature-card h3 { font-size: 18px; font-weight: 700; color: var(--ink); margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--text-soft); }

/* ============ 产品系列 ============ */
.series-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 22px;
}
.product-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
  display: flex;
  flex-direction: column;
  color: inherit;
  text-decoration: none;
}
a.product-card { cursor: pointer; }
.product-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
.product-media {
  position: relative;
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(115% 100% at 50% 42%, #ffffff 0%, #f3f8ff 48%, #e2edfb 100%);
  display: grid;
  place-items: center;
  overflow: hidden;
}
.product-media img {
  width: 90%;
  height: 90%;
  object-fit: contain;
  mix-blend-mode: multiply;
  transition: transform 0.5s var(--ease);
}
.product-card:hover .product-media img { transform: scale(1.06) translateY(-4px); }
.product-placeholder {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 28px;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--azure), var(--deep-2));
}
.product-body { padding: 20px 22px 24px; }
.product-en { font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--azure); font-weight: 700; }
.product-name { font-size: 21px; font-weight: 800; color: var(--ink); margin: 2px 0 8px; }
.product-desc { font-size: 13.5px; color: var(--text-soft); }
.product-tag {
  position: absolute; top: 14px; left: 14px; z-index: 2;
  font-size: 11px; font-weight: 700; letter-spacing: 0.06em;
  padding: 5px 12px; border-radius: 999px;
  color: #fff;
  background: linear-gradient(135deg, var(--azure), var(--deep-2));
  box-shadow: 0 6px 16px rgba(10, 61, 145, 0.3);
}

/* ============ FAQ ============ */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 14px;
  overflow: hidden;
  backdrop-filter: blur(8px);
  transition: box-shadow 0.3s;
}
.faq-item.open { box-shadow: var(--shadow); }
.faq-q {
  width: 100%;
  display: flex; align-items: center; justify-content: space-between;
  gap: 14px;
  padding: 20px 22px;
  font-size: 16px; font-weight: 600; color: var(--ink);
  text-align: left;
}
.faq-q .chev { flex: none; transition: transform 0.3s var(--ease); color: var(--azure); }
.faq-item.open .chev { transform: rotate(180deg); }
.faq-a {
  max-height: 0; overflow: hidden;
  padding: 0 22px;
  color: var(--text-soft); font-size: 14.5px;
  transition: max-height 0.4s var(--ease), padding 0.4s var(--ease);
}
.faq-item.open .faq-a { max-height: 240px; padding: 0 22px 20px; }

/* ============ 页脚 ============ */
.footer { padding: 46px 0; border-top: 1px solid var(--line); background: rgba(255,255,255,0.4); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-logo { width: 40px; height: 40px; border-radius: 11px; }
.footer-name { font-weight: 700; color: var(--deep-2); }
.footer-tag { font-size: 13px; color: var(--text-faint); }
.footer-copy { font-size: 13px; color: var(--text-faint); }

/* ============ Reveal 动画 ============ */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); will-change: opacity, transform; }
.reveal.in { opacity: 1; transform: none; }

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  .nav-links { display: none; }
}
@media (max-width: 768px) {
  .section { padding: 68px 0; }
  .container { padding: 0 20px; }
  .section-head { margin-bottom: 40px; }
  .hero-logo { width: 96px; height: 96px; }
  .whale { width: 200px; }
  .footer-inner { flex-direction: column; align-items: flex-start; text-align: left; }
}
@media (max-width: 520px) {
  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; }
  .nav-cta { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}