:root {
  --bg: #fbfcfa;
  --surface: rgba(255, 255, 255, 0.76);
  --surface-strong: #ffffff;
  --text: #162033;
  --muted: #8c98a8;
  --line: rgba(116, 138, 164, 0.12);
  --line-strong: rgba(86, 112, 142, 0.18);
  --primary: #4ec9cb;
  --primary-deep: #39b3b6;
  --shadow: 0 20px 48px rgba(42, 70, 106, 0.08);
  --radius-xl: 30px;
  --radius-lg: 22px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: Inter, "Noto Sans SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 75% 24%, rgba(111, 234, 226, 0.18), transparent 18%),
    radial-gradient(circle at 12% 85%, rgba(111, 234, 226, 0.08), transparent 14%),
    linear-gradient(rgba(99, 130, 164, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 130, 164, 0.06) 1px, transparent 1px),
    linear-gradient(180deg, #fffefc 0%, #fbfcfa 100%);
  background-size: auto, auto, 40px 40px, 40px 40px, auto;
}

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

.page-shell {
  width: min(1460px, calc(100% - 40px));
  margin: 0 auto;
  padding: 14px 0 64px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 56px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.brand-copy {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.brand-copy strong {
  font-size: 20px;
  font-weight: 800;
}

.brand-copy span,
.site-nav a,
.header-tools a,
.hero-copy p,
.hero-copy h2,
.hero-tip p,
.section-intro p,
.feature-card p,
.tool span,
.chip {
  color: var(--muted);
}

.brand-copy span {
  font-size: 13px;
}

.site-nav,
.header-tools,
.hero-actions,
.brand-copy {
  display: flex;
  align-items: center;
}

.site-nav {
  gap: 34px;
}

.site-nav a,
.header-tools a {
  font-size: 15px;
  font-weight: 600;
}

.site-nav .is-active {
  color: var(--text);
}

.header-tools {
  gap: 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 132px;
  height: 48px;
  padding: 0 22px;
  border-radius: 14px;
  border: 1px solid transparent;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    border-color 0.2s ease,
    background-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(180deg, var(--primary), var(--primary-deep));
  color: #fff;
  box-shadow: 0 14px 30px rgba(78, 201, 203, 0.25);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.72);
  border-color: var(--line);
  color: #687588;
}

.notice-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 10px;
  min-height: 32px;
  border: 1px solid rgba(78, 201, 203, 0.2);
  background: rgba(111, 234, 226, 0.11);
  color: #4c9e9f;
  font-size: 14px;
}

.notice-bar p {
  margin: 0;
}

.notice-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: #4ec9cb;
  box-shadow: 0 0 0 4px rgba(78, 201, 203, 0.12);
}

.hero {
  display: grid;
  grid-template-columns: minmax(420px, 0.9fr) 1.1fr;
  gap: 24px;
  align-items: center;
  min-height: 760px;
}

.hero-copy {
  max-width: 600px;
  justify-self: center;
}

.mini-line {
  display: inline-block;
  width: 28px;
  height: 4px;
  border-radius: 999px;
  background: var(--primary);
}

.hero-copy h1 {
  margin: 18px 0 12px;
  font-size: clamp(54px, 6vw, 82px);
  line-height: 1.04;
  letter-spacing: -0.05em;
  font-weight: 800;
}

.hero-copy h1 span {
  color: var(--primary);
}

.hero-copy h2 {
  margin: 0;
  font-size: 34px;
  line-height: 1.35;
  font-weight: 800;
}

.hero-copy p {
  margin: 18px 0 0;
  max-width: 560px;
  font-size: 18px;
  line-height: 1.8;
}

.hero-actions {
  gap: 14px;
  margin-top: 26px;
}

.hero-tip {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
}

.hero-tip span {
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--muted);
  font-size: 12px;
}

.hero-tip p {
  margin: 0;
  font-size: 15px;
}

.hero-tip a {
  color: var(--primary-deep);
  font-weight: 700;
}

.hero-cloud {
  position: relative;
  min-height: 620px;
}

.tool,
.chip {
  position: absolute;
}

.tool {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.tool-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  font-size: 20px;
}

.tool span {
  font-size: 13px;
}

.coral { background: #eb7e54; color: #fff; }
.amber { background: #f0c164; color: #6b5317; }
.dark { background: #1f1d18; color: #fff; }
.red { background: #f26f6f; color: #fff; }
.light { background: #fafafa; color: #111; }
.blue { background: #4d9df7; color: #fff; }
.pink { background: #141214; color: #ffaf76; }
.rose { background: #ff6b6b; color: #fff; }

.chip {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  box-shadow: 0 10px 24px rgba(42, 70, 106, 0.05);
  font-size: 12px;
  font-weight: 600;
}

.tool-a { left: 22%; top: 10%; }
.tool-b { left: 44%; top: 6%; }
.tool-c { left: 66%; top: 13%; }
.tool-d { left: 18%; top: 30%; }
.tool-e { left: 20%; top: 60%; }
.tool-f { left: 30%; top: 80%; }
.tool-g { left: 73%; top: 49%; }
.tool-h { left: 61%; top: 70%; }

.chip-a { left: 36%; top: 21%; }
.chip-b { left: 56%; top: 29%; }
.chip-c { left: 29%; top: 35%; }
.chip-d { left: 36%; top: 64%; }
.chip-e { left: 39%; top: 86%; }
.chip-f { left: 58%; top: 50%; }

.section-intro {
  padding: 20px 0 4px;
  text-align: center;
}

.section-intro h3 {
  margin: 0;
  font-size: 52px;
  line-height: 1.12;
  font-weight: 800;
}

.section-intro p {
  margin: 16px auto 0;
  max-width: 780px;
  font-size: 18px;
  line-height: 1.8;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 30px;
}

.feature-card {
  padding: 26px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.feature-card strong {
  display: block;
  font-size: 22px;
  font-weight: 800;
}

.feature-card p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
}

@media (max-width: 1280px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 42px;
  }

  .hero-copy {
    max-width: 760px;
    text-align: center;
  }

  .hero-copy p {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions,
  .hero-tip {
    justify-content: center;
  }

  .hero-cloud {
    min-height: 520px;
    width: min(900px, 100%);
    margin: 0 auto;
  }

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

@media (max-width: 760px) {
  .page-shell {
    width: min(100% - 20px, 100%);
    padding: 10px 0 40px;
  }

  .site-header,
  .site-nav,
  .header-tools,
  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-header {
    height: auto;
    align-items: flex-start;
    margin-bottom: 12px;
  }

  .site-nav {
    gap: 14px;
  }

  .notice-bar {
    align-items: flex-start;
    padding: 10px 12px;
    line-height: 1.6;
  }

  .hero {
    gap: 10px;
    padding-top: 28px;
  }

  .hero-copy {
    text-align: left;
  }

  .hero-copy h1 {
    font-size: 44px;
  }

  .hero-copy h2 {
    font-size: 22px;
  }

  .hero-copy p {
    font-size: 15px;
    margin-left: 0;
    margin-right: 0;
  }

  .hero-actions,
  .hero-tip {
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .hero-cloud {
    min-height: 420px;
    transform: scale(0.86);
    transform-origin: top center;
  }

  .section-intro h3 {
    font-size: 34px;
  }

  .section-intro p {
    font-size: 15px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }
}