/* ==========================================================================
   Athena AI — base.css
   Reset, variables de diseño (tema claro/oscuro) y tipografia.
   ========================================================================== */

:root {
  /* Paleta — tema claro (por defecto) */
  --color-bg: #f7f8fb;
  --color-bg-elevated: #ffffff;
  --color-bg-muted: #eef0f6;
  --color-border: #e2e5ee;
  --color-text: #12141c;
  --color-text-muted: #565b6d;
  --color-text-subtle: #82869a;

  --color-primary: #5b5bf6;
  --color-primary-hover: #4747e0;
  --color-primary-contrast: #ffffff;
  --color-accent: #14b8a6;

  --color-success: #1a9c6a;
  --color-danger: #e2483d;

  --gradient-hero: radial-gradient(circle at 15% 15%, rgba(91, 91, 246, 0.16), transparent 45%),
    radial-gradient(circle at 85% 10%, rgba(20, 184, 166, 0.14), transparent 40%);

  --shadow-sm: 0 1px 2px rgba(18, 20, 28, 0.06);
  --shadow-md: 0 8px 24px rgba(18, 20, 28, 0.08);
  --shadow-lg: 0 20px 48px rgba(18, 20, 28, 0.14);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 999px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "Noto Sans", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --container-width: 1160px;
  --transition-fast: 150ms ease;
  --transition-base: 240ms ease;
}

:root[data-theme="dark"] {
  --color-bg: #0b0c12;
  --color-bg-elevated: #14151f;
  --color-bg-muted: #1a1c29;
  --color-border: #262838;
  --color-text: #f3f4f8;
  --color-text-muted: #a7abc0;
  --color-text-subtle: #767b93;

  --color-primary: #8686ff;
  --color-primary-hover: #a1a1ff;
  --color-primary-contrast: #0b0c12;
  --color-accent: #2dd4bf;

  --gradient-hero: radial-gradient(circle at 15% 15%, rgba(134, 134, 255, 0.18), transparent 45%),
    radial-gradient(circle at 85% 10%, rgba(45, 212, 191, 0.14), transparent 40%);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.55);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0b0c12;
    --color-bg-elevated: #14151f;
    --color-bg-muted: #1a1c29;
    --color-border: #262838;
    --color-text: #f3f4f8;
    --color-text-muted: #a7abc0;
    --color-text-subtle: #767b93;

    --color-primary: #8686ff;
    --color-primary-hover: #a1a1ff;
    --color-primary-contrast: #0b0c12;
    --color-accent: #2dd4bf;

    --gradient-hero: radial-gradient(circle at 15% 15%, rgba(134, 134, 255, 0.18), transparent 45%),
      radial-gradient(circle at 85% 10%, rgba(45, 212, 191, 0.14), transparent 40%);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.55);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

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

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2.4rem, 4.5vw, 3.75rem);
}

h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}

h3 {
  font-size: 1.25rem;
}

code,
pre {
  font-family: var(--font-mono);
}

::selection {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}