:root {
  --color-bg: #f4f7fb;
  --color-bg-elevated: #ffffff;
  --color-bg-soft: #f8fbff;
  --color-text: #10243e;
  --color-text-muted: #54657d;
  --color-border: #d7e2f1;
  --color-primary: #1d5fd2;
  --color-primary-strong: #144ba8;
  --color-primary-soft: #e7f0ff;
  --color-accent: #0e9f8d;
  --color-success: #1d8f55;
  --color-warning: #b9780f;
  --color-danger: #c2413a;

  --grad-hero: linear-gradient(135deg, #1a3e71 0%, #235ea8 45%, #157e89 100%);
  --grad-page: radial-gradient(circle at 0% 0%, rgba(29, 95, 210, 0.1), transparent 45%),
    radial-gradient(circle at 100% 100%, rgba(14, 159, 141, 0.1), transparent 35%),
    #f4f7fb;

  --font-family-base: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-family-display: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.35rem;
  --font-size-2xl: clamp(1.75rem, 3vw, 2.25rem);
  --font-size-3xl: clamp(2.1rem, 4vw, 2.9rem);
  --line-height-tight: 1.2;
  --line-height-base: 1.55;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-pill: 999px;

  --shadow-sm: 0 2px 8px rgba(16, 36, 62, 0.08);
  --shadow-md: 0 10px 28px rgba(18, 45, 80, 0.12);
  --shadow-lg: 0 18px 42px rgba(18, 45, 80, 0.18);
  --ring-focus: 0 0 0 3px rgba(29, 95, 210, 0.28);

  --content-max: 1200px;
  --transition-fast: 160ms ease;
  --transition-base: 240ms ease;
  --control-height: 46px;
  --control-height-sm: 40px;
}

* {
  box-sizing: border-box;
}

html,
body {
  font-family: var(--font-family-base);
  color: var(--color-text);
  background: var(--grad-page);
}

body {
  line-height: var(--line-height-base);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--color-primary);
}

a:hover {
  color: var(--color-primary-strong);
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-family-display);
  color: var(--color-text);
  letter-spacing: -0.01em;
  line-height: var(--line-height-tight);
  margin-block: 0 0.55em;
}

p {
  color: var(--color-text-muted);
}

:focus-visible {
  outline: none;
  box-shadow: var(--ring-focus);
  border-radius: var(--radius-sm);
}