/* base.css — HealthDataCon 2026 */

/* ---- Design tokens ---- */
:root {
  /* Type scale (fluid) */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(3rem, 0.5rem + 7vw, 8rem);

  /* Spacing (4px system) */
  --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;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --transition-interactive: 200ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Fonts */
  --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Consolas, monospace;

  /* Content widths */
  --content-narrow: 720px;
  --content-default: 1080px;
  --content-wide: 1280px;

  /* Brand palette — derived from HealthDataCon logo */
  --hdc-navy-950: #060f22;
  --hdc-navy-900: #0a1930;
  --hdc-navy-800: #10233f;
  --hdc-navy-700: #172e50;
  --hdc-navy-600: #1e3a63;
  --hdc-teal: #2fb8b3;
  --hdc-teal-deep: #1e7f7c;
  --hdc-teal-light: #4bd2c2;
  --hdc-gold: #d4a24a;
  --hdc-gold-deep: #b6853a;
  --hdc-blue: #4a8fd6;
  --hdc-white: #f7f8fb;
}

/* ---- Dark theme (default) ---- */
:root,
[data-theme='dark'] {
  --color-bg: var(--hdc-navy-950);
  --color-bg-2: var(--hdc-navy-900);
  --color-surface: #0d1d38;
  --color-surface-2: #132646;
  --color-surface-offset: #1a2f55;
  --color-divider: rgba(255, 255, 255, 0.09);
  --color-border: rgba(255, 255, 255, 0.15);
  --color-border-strong: rgba(255, 255, 255, 0.28);

  --color-text: #ecf1f8;
  --color-text-muted: #a8b4c8;
  --color-text-faint: #6a7691;
  --color-text-inverse: var(--hdc-navy-900);

  --color-primary: var(--hdc-teal);
  --color-primary-hover: var(--hdc-teal-light);
  --color-primary-active: var(--hdc-teal-deep);

  --color-accent: var(--hdc-gold);
  --color-accent-hover: #e8b767;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.55);
  --shadow-glow: 0 0 0 1px rgba(47, 184, 179, 0.35), 0 12px 40px rgba(47, 184, 179, 0.2);
}

/* ---- Light theme ---- */
[data-theme='light'] {
  --color-bg: #f4f6fa;
  --color-bg-2: #ffffff;
  --color-surface: #ffffff;
  --color-surface-2: #f0f3f9;
  --color-surface-offset: #e6ecf5;
  --color-divider: rgba(10, 25, 48, 0.08);
  --color-border: rgba(10, 25, 48, 0.14);
  --color-border-strong: rgba(10, 25, 48, 0.3);

  --color-text: #0a1930;
  --color-text-muted: #4a5a75;
  --color-text-faint: #8d99b0;
  --color-text-inverse: #ffffff;

  --color-primary: var(--hdc-teal-deep);
  --color-primary-hover: var(--hdc-teal);
  --color-primary-active: #155553;

  --color-accent: var(--hdc-gold-deep);
  --color-accent-hover: var(--hdc-gold);

  --shadow-sm: 0 1px 2px rgba(10, 25, 48, 0.06);
  --shadow-md: 0 8px 24px rgba(10, 25, 48, 0.08);
  --shadow-lg: 0 24px 60px rgba(10, 25, 48, 0.12);
  --shadow-glow: 0 0 0 1px rgba(30, 127, 124, 0.35), 0 12px 40px rgba(30, 127, 124, 0.18);
}

/* ---- Reset ---- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  text-wrap: balance;
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 600;
}

p,
li,
figcaption {
  text-wrap: pretty;
  max-width: 72ch;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

button {
  cursor: pointer;
  background: none;
  border: none;
  color: inherit;
}

table {
  border-collapse: collapse;
  width: 100%;
}

::selection {
  background: rgba(47, 184, 179, 0.35);
  color: var(--color-text);
}

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

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

a,
button,
[role='button'],
input,
textarea,
select {
  transition:
    color var(--transition-interactive),
    background var(--transition-interactive),
    border-color var(--transition-interactive),
    box-shadow var(--transition-interactive),
    transform var(--transition-interactive);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.skip-link {
  position: absolute;
  left: 0;
  top: 0;
  padding: var(--space-3) var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.skip-link:focus {
  clip: auto;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  z-index: 100;
}

.mono {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.mono.thin {
  letter-spacing: 0.14em;
  color: var(--color-text-faint);
}

em {
  font-style: normal;
  color: var(--color-accent);
}

/* Containers */
.container-wide {
  width: 100%;
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}
.container-narrow {
  width: 100%;
  max-width: var(--content-narrow);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}