/* static/css/style.css */
:root {
  --color-primary-50: 214 100% 97%;
  --color-primary-100: 214 95% 93%;
  --color-primary-200: 214 92% 86%;
  --color-primary-300: 213 90% 76%;
  --color-primary-400: 213 90% 64%;
  --color-primary-500: 213 94% 54%;
  --color-primary-600: 213 94% 48%;
  --color-primary-700: 213 90% 40%;
  --color-primary-800: 213 86% 32%;
  --color-primary-900: 213 80% 24%;


  --color-neutral-0: 0 0% 100%;
  --color-neutral-50: 210 20% 98%;
  --color-neutral-100: 210 18% 96%;
  --color-neutral-200: 214 16% 91%;
  --color-neutral-300: 213 14% 82%;
  --color-neutral-400: 215 12% 62%;
  --color-neutral-500: 216 10% 46%;
  --color-neutral-600: 217 12% 34%;
  --color-neutral-700: 218 14% 24%;
  --color-neutral-800: 219 16% 16%;
  --color-neutral-900: 220 18% 10%;

  --color-success: 158 64% 42%;
  --color-warning: 38 92% 50%;
  --color-error: 0 72% 51%;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-7: 2.25rem;
  --space-8: 3rem;
  --space-9: 4rem;
  --space-10: 5rem;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3.25rem;

  --leading-tight: 1.15;
  --leading-snug: 1.3;
  --leading-normal: 1.5;
  --leading-relaxed: 1.65;

  --tracking-tight: -0.04em;
  --tracking-normal: -0.01em;
  --tracking-wide: 0.02em;

  --shadow-xs: 0 1px 2px hsl(var(--color-neutral-900) / 0.04);
  --shadow-sm: 0 2px 4px hsl(var(--color-neutral-900) / 0.06);
  --shadow-md: 0 4px 12px hsl(var(--color-neutral-900) / 0.08);
  --shadow-lg: 0 8px 24px hsl(var(--color-neutral-900) / 0.10);
  --shadow-xl: 0 16px 48px hsl(var(--color-neutral-900) / 0.12);
  --shadow-glow: 0 0 40px hsl(var(--color-primary-400) / 0.15);

  --border-thin: 0.5px solid hsl(var(--color-neutral-200));
  --border-default: 1px solid hsl(var(--color-neutral-200));
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-normal);
  color: hsl(var(--color-neutral-800));
  background-color: hsl(var(--color-neutral-0));
  margin: 0;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  color: hsl(var(--color-neutral-900));
  margin: 0;
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

@media (min-width: 768px) {
  h1 { font-size: var(--text-5xl); }
  h2 { font-size: var(--text-4xl); }
}

p { max-width: 600px; line-height: var(--leading-relaxed); }
.text-balance { text-wrap: balance; }

.container-default {
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.container-narrow {
  max-width: 680px;
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.section-spacing { padding-block: var(--space-9); }
@media (min-width: 768px) { .section-spacing { padding-block: var(--space-10); } }

/* Buttons */
.btn-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: center;
}

@media (min-width: 480px) {
  .btn-group { flex-direction: row; justify-content: center; }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: inherit;
  font-size: var(--text-base);
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition:
    transform var(--duration-fast) var(--ease-out-expo),
    box-shadow var(--duration-normal) var(--ease-out-quart),
    background-color var(--duration-fast) ease;
  white-space: nowrap;
  min-height: 48px;
}

.btn:focus-visible { outline: 2px solid hsl(var(--color-primary-500)); outline-offset: 2px; }

.btn-primary {
  background: linear-gradient(135deg, hsl(var(--color-primary-600)) 0%, hsl(var(--color-primary-500)) 100%);
  color: hsl(var(--color-neutral-0));
  box-shadow: var(--shadow-md), 0 0 0 0 hsl(var(--color-primary-400) / 0);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 24px hsl(var(--color-primary-400) / 0.3);
}

.btn-primary:active { transform: translateY(0); }

.btn-primary .btn-icon { transition: transform var(--duration-fast) var(--ease-out-expo); }
.btn-primary:hover .btn-icon { transform: translateX(3px); }

.btn-secondary {
  background: hsl(var(--color-neutral-0));
  color: hsl(var(--color-neutral-700));
  border: var(--border-default);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: hsl(var(--color-neutral-50));
  border-color: hsl(var(--color-neutral-300));
  box-shadow: var(--shadow-md);
}

.btn-lg { padding: var(--space-4) var(--space-6); font-size: var(--text-lg); min-height: 56px; }

/* Footer */
.footer {
  padding-block: var(--space-7);
  background: hsl(var(--color-neutral-900));
  color: hsl(var(--color-neutral-400));
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  text-align: center;
}

@media (min-width: 768px) {
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-logo { font-size: var(--text-lg); font-weight: 600; color: hsl(var(--color-neutral-0)); }
.footer-links { display: flex; gap: var(--space-5); }

.footer-link {
  font-size: var(--text-sm);
  color: hsl(var(--color-neutral-400));
  text-decoration: none;
  transition: color var(--duration-fast) ease;
}

.footer-link:hover { color: hsl(var(--color-neutral-0)); }
.footer-copy { font-size: var(--text-sm); }

/* Utilities */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.text-center { text-align: center; }
.mx-auto { margin-inline: auto; }

@supports not (scrollbar-gutter: stable) {
  html {
    overflow-y: scroll;
  }
}