/**
 * theme.css - global design tokens and document-level styling
 */

:root {
  --color-primary: #123a7a;
  --color-primary-strong: #0b2654;
  --color-primary-soft: #e8f0ff;
  --color-secondary: #0d7a72;
  --color-accent: #f0a43a;

  --color-text: #142033;
  --color-text-muted: #5c6a7e;
  --color-heading: #0a1630;
  --color-bg: #f5f8fc;
  --color-bg-alt: #edf3fb;
  --color-surface: rgba(255, 255, 255, 0.88);
  --color-surface-strong: #ffffff;
  --color-border: rgba(17, 33, 66, 0.1);
  --color-border-strong: rgba(18, 58, 122, 0.18);

  --shadow-sm: 0 10px 30px rgba(16, 35, 70, 0.06);
  --shadow-md: 0 18px 48px rgba(13, 31, 63, 0.1);
  --shadow-lg: 0 28px 80px rgba(10, 25, 54, 0.16);

  --radius-sm: 0.75rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;

  --font-sans:
    "Inter", "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-display:
    "Inter", "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.625rem;
  --font-size-3xl: 2.25rem;
  --font-size-4xl: 3rem;
  --font-size-5xl: 4rem;
  --line-height-tight: 1.15;
  --line-height-normal: 1.7;
  --line-height-relaxed: 1.9;

  --container-max: 76rem;
  --container-padding-x: 1rem;
  --container-padding-x-md: 1.5rem;
  --container-padding-x-xl: 2rem;
  --header-height: 4.5rem;
  --section-padding-y-mobile: 4rem;
  --section-padding-y: 6rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  font-weight: 400;
  font-kerning: normal;
  color: var(--color-text);
  background:
    radial-gradient(circle at top left, rgba(81, 132, 221, 0.12), transparent 28%),
    radial-gradient(circle at right 15%, rgba(13, 122, 114, 0.12), transparent 24%),
    linear-gradient(180deg, #f7fbff 0%, #eef4fb 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(18, 58, 122, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 58, 122, 0.03) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.32), transparent 75%);
  z-index: -1;
}

.page-shell {
  min-height: 100vh;
}

.container-custom {
  width: min(100%, var(--container-max));
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding-x);
  padding-right: var(--container-padding-x);
}

@media (min-width: 768px) {
  .container-custom {
    padding-left: var(--container-padding-x-md);
    padding-right: var(--container-padding-x-md);
  }
}

@media (min-width: 1200px) {
  .container-custom {
    padding-left: var(--container-padding-x-xl);
    padding-right: var(--container-padding-x-xl);
  }
}

h1,
h2,
h3,
h4,
h5,
h6,
.h1,
.h2,
.h3,
.h4,
.h5,
.h6 {
  margin: 0;
  color: var(--color-heading);
  font-family: var(--font-display);
  letter-spacing: -0.02em;
}

h1,
.h1 {
  font-size: var(--font-size-3xl);
  line-height: var(--line-height-tight);
  font-weight: 700;
}

h2,
.h2 {
  font-size: var(--font-size-2xl);
  line-height: 1.2;
  font-weight: 700;
}

h3,
.h3 {
  font-size: var(--font-size-xl);
  line-height: 1.25;
  font-weight: 700;
}

p,
.text-body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  font-weight: 400;
  line-height: var(--line-height-normal);
  letter-spacing: 0.01em;
  color: var(--color-text);
}

.text-body--muted {
  color: var(--color-text-muted);
}

p + p,
.text-body + .text-body {
  margin-top: 24px;
}

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

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

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

::selection {
  background: rgba(18, 58, 122, 0.18);
}

:focus-visible {
  outline: 3px solid rgba(18, 58, 122, 0.22);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 20000;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-md);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
}

.section-padding {
  padding-top: var(--section-padding-y-mobile);
  padding-bottom: var(--section-padding-y-mobile);
}

@media (min-width: 768px) {
  .section-padding {
    padding-top: var(--section-padding-y);
    padding-bottom: var(--section-padding-y);
  }

  h1,
  .h1 {
    font-size: var(--font-size-4xl);
  }

  h2,
  .h2 {
    font-size: var(--font-size-3xl);
  }
}

@media (min-width: 1200px) {
  h1,
  .h1 {
    font-size: var(--font-size-5xl);
  }
}