:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --line: #e2e8f0;
  --max-width: 1200px;
  --radius: 16px;
}

body.dark {
  --bg: #0b1220;
  --surface: #111b2e;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --line: #22314d;
  --primary: #3b82f6;
  --primary-dark: #2563eb;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(var(--max-width), calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  --mx: 50%;
  --my: 50%;
  --halo-opacity: 0;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle 260px at var(--mx) var(--my), rgba(56, 189, 248, 0.24), transparent 70%),
    linear-gradient(110deg, transparent 20%, rgba(59, 130, 246, 0.12) 45%, transparent 70%);
  transform: translateX(-120%);
  animation: headerSweep 11s linear infinite;
  opacity: calc(0.7 + var(--halo-opacity));
  transition: opacity 0.25s ease;
}

.site-header::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(37, 99, 235, 0.06) 0px,
    rgba(37, 99, 235, 0.06) 1px,
    transparent 2px,
    transparent 6px
  );
  opacity: 0.16;
}

@keyframes headerSweep {
  0% {
    transform: translateX(-120%);
  }
  100% {
    transform: translateX(160%);
  }
}

body.dark .site-header {
  background: linear-gradient(100deg, rgba(6, 18, 45, 0.96), rgba(15, 34, 80, 0.95), rgba(39, 20, 88, 0.92));
  border-bottom-color: rgba(96, 165, 250, 0.55);
  box-shadow:
    0 0 0 1px rgba(96, 165, 250, 0.18) inset,
    0 12px 34px rgba(37, 99, 235, 0.32),
    0 0 46px rgba(59, 130, 246, 0.22);
}

body.dark .site-header::before {
  background:
    radial-gradient(circle 340px at var(--mx) var(--my), rgba(34, 211, 238, 0.4), transparent 72%),
    linear-gradient(
      110deg,
      transparent 18%,
      rgba(56, 189, 248, 0.34) 42%,
      rgba(167, 139, 250, 0.28) 54%,
      transparent 76%
    );
  opacity: 1;
  animation-duration: 8s;
}

body.dark .site-header::after {
  background-image: repeating-linear-gradient(
    180deg,
    rgba(125, 211, 252, 0.13) 0px,
    rgba(125, 211, 252, 0.13) 1px,
    transparent 2px,
    transparent 5px
  );
  opacity: 0.3;
}

.site-header.header-fx::before {
  opacity: calc(0.95 + var(--halo-opacity));
}

.header-inner {
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.2px;
}

.brand span {
  color: var(--primary);
}

.main-nav {
  display: flex;
  gap: 24px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.main-nav a {
  color: var(--muted);
  font-weight: 500;
  padding: 6px 4px;
  min-width: 118px;
  text-align: center;
}

.main-nav a.active,
.main-nav a:hover {
  color: var(--text);
}

body.dark .main-nav a:hover {
  background: linear-gradient(90deg, rgba(37, 99, 235, 0.34), rgba(124, 58, 237, 0.3));
  color: #ffffff;
  text-shadow: 0 0 10px rgba(147, 197, 253, 0.8);
}

body.dark .main-nav a.active {
  color: #dbeafe;
  background: linear-gradient(90deg, rgba(29, 78, 216, 0.38), rgba(109, 40, 217, 0.33));
  text-shadow: 0 0 14px rgba(191, 219, 254, 0.95);
}

body.dark .icon-toggle,
body.dark .menu-toggle,
body.dark .lang-toggle {
  border-color: rgba(96, 165, 250, 0.52);
  background: linear-gradient(120deg, rgba(30, 64, 175, 0.34), rgba(91, 33, 182, 0.3));
  box-shadow:
    0 0 0 1px rgba(125, 211, 252, 0.25) inset,
    0 0 18px rgba(59, 130, 246, 0.35);
}

body.dark .icon-toggle,
body.dark .menu-toggle {
  color: #dbeafe;
  padding: 10px 16px;
  letter-spacing: 0.3px;
}

body.dark .lang-toggle {
  padding: 7px;
}

body.dark .lang-toggle button {
  color: #cbd5e1;
  padding: 8px 14px;
}

body.dark .lang-toggle button.active {
  background: linear-gradient(90deg, #2563eb, #7c3aed);
  box-shadow: 0 0 16px rgba(59, 130, 246, 0.6);
}

body.dark .brand span {
  color: #93c5fd;
  text-shadow: 0 0 14px rgba(59, 130, 246, 0.8);
}

body.dark .main-nav a {
  border-radius: 10px;
  transition: all 0.22s ease;
}

body.dark .main-nav a:hover,
body.dark .main-nav a.active {
  transform: translateY(-1px);
}

.header-controls {
  display: flex;
  gap: 10px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.icon-toggle,
.menu-toggle {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  border-radius: 999px;
  padding: 8px 12px;
  font-weight: 600;
  cursor: pointer;
}

.lang-toggle {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 999px;
  padding: 6px;
  display: flex;
  gap: 4px;
}

.lang-toggle button {
  border: 0;
  background: transparent;
  border-radius: 999px;
  padding: 6px 12px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
}

.lang-toggle button.active {
  background: var(--primary);
  color: #fff;
}

.hero {
  padding: 84px 0 110px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1.1;
  margin: 0 0 22px;
  letter-spacing: -0.03em;
}

.hero p {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 54ch;
  margin-bottom: 28px;
}

.cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  border-radius: 12px;
  padding: 12px 18px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: 0.2s ease;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  background: var(--surface);
  border-color: var(--line);
}

.site-header .brand {
  position: relative;
  z-index: 1;
}

body:not(.dark) .site-header {
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.94), rgba(241, 246, 255, 0.94));
  border-bottom-color: rgba(37, 99, 235, 0.16);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.08);
}

body:not(.dark) .main-nav a:hover {
  color: #1d4ed8;
  text-shadow: 0 0 8px rgba(96, 165, 250, 0.45);
}

body:not(.dark) .main-nav a.active {
  color: #1e40af;
}

body:not(.dark) .icon-toggle,
body:not(.dark) .menu-toggle,
body:not(.dark) .lang-toggle {
  border-color: rgba(37, 99, 235, 0.2);
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.96), rgba(239, 246, 255, 0.96));
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.08);
}

.hero-image {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 25px 40px rgba(15, 23, 42, 0.12);
}

.section {
  padding: 82px 0;
}

.section h2 {
  margin: 0 0 14px;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  letter-spacing: -0.02em;
}

.section-lead {
  color: var(--muted);
  max-width: 68ch;
  margin: 0 0 34px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}

.card h3 {
  margin: 0 0 10px;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px;
}

.panel ul {
  margin: 0;
  padding-left: 20px;
}

.panel li {
  margin: 8px 0;
}

.contact-form {
  display: grid;
  gap: 14px;
}

label {
  font-weight: 600;
}

input,
textarea {
  width: 100%;
  padding: 12px 13px;
  border-radius: 10px;
  border: 1px solid var(--line);
  font: inherit;
}

select {
  width: 100%;
  padding: 12px 13px;
  border-radius: 10px;
  border: 1px solid var(--line);
  font: inherit;
  color: var(--text);
  background: var(--surface);
}

textarea {
  min-height: 130px;
  resize: vertical;
}

.site-footer {
  padding: 38px 0 46px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.footer-inner {
  display: grid;
  gap: 10px;
}

.footer-inner > p {
  margin: 0;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
}

.footer-legal a:hover {
  color: var(--primary);
}

.footer-sep {
  opacity: 0.5;
}

.privacy-consent {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-weight: 400;
  color: var(--muted);
}

.privacy-consent input {
  width: auto;
  margin-top: 4px;
}

.privacy-consent a {
  color: var(--primary);
  font-weight: 600;
}

.legal-page {
  padding-top: 48px;
}

.legal-content h1 {
  margin: 0 0 8px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.legal-updated {
  color: var(--muted);
  margin: 0 0 28px;
}

.legal-content h2 {
  margin: 28px 0 10px;
  font-size: 1.15rem;
}

.legal-content p {
  margin: 0 0 12px;
  color: var(--muted);
}

.form-status {
  min-height: 24px;
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.cases {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.case-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.case-card h3 {
  margin: 4px 0 10px;
}

.case-card p {
  margin: 0;
  color: var(--muted);
}

.case-kicker {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 700;
}

.cta-banner {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.cta-banner p {
  margin: 8px 0 0;
  color: var(--muted);
}

.menu-toggle {
  display: none;
}

@media (max-width: 980px) {
  .hero-grid,
  .cards,
  .split,
  .cases {
    grid-template-columns: 1fr 1fr;
  }

  .cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .header-inner {
    flex-wrap: nowrap;
    height: auto;
    padding: 12px 0;
  }

  .main-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 74px;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 14px;
    overflow: hidden;
    display: none;
  }

  .main-nav a {
    padding: 12px 16px;
    border-bottom: 1px solid var(--line);
    min-width: 100%;
    text-align: left;
  }

  .main-nav a:last-child {
    border-bottom: 0;
  }

  body.nav-open .main-nav {
    display: flex;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .hero-grid,
  .split,
  .cards,
  .cases {
    grid-template-columns: 1fr;
  }

  .cta-banner {
    flex-direction: column;
    align-items: flex-start;
  }

  .container {
    width: min(var(--max-width), calc(100% - 32px));
  }
}