/* base.css — PBS Kidsteer Design Tokens & Reset */

/* ============================================
   TYPE SCALE (fluid)
   ============================================ */
:root {
  --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 base)
     ============================================ */
  --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;

  /* ============================================
     TRANSITIONS
     ============================================ */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:     cubic-bezier(0.4, 0, 1, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);

  /* ============================================
     CONTENT WIDTHS
     ============================================ */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;

  /* ============================================
     FONTS
     ============================================ */
  --font-display: 'Clash Display', 'Impact', sans-serif;
  --font-body: 'Satoshi', 'Helvetica Neue', sans-serif;
}

/* ============================================
   PBS KIDSTEER PALETTE
   Penn State Navy Blue + White + Light Grey
   ============================================ */

/* Light mode is DEFAULT — clean professional blue/white */
:root, [data-theme="light"] {
  --color-bg:             #f4f6f9;
  --color-surface:        #ffffff;
  --color-surface-2:      #f8f9fb;
  --color-surface-offset: #e8edf4;
  --color-surface-offset-2: #dde4ef;
  --color-surface-dynamic: #cdd6e8;
  --color-divider:        #c8d2e4;
  --color-border:         #b8c5d9;

  --color-text:           #0d1a2e;
  --color-text-muted:     #4a5c78;
  --color-text-faint:     #8a9ab8;
  --color-text-inverse:   #ffffff;

  /* Primary Accent — Penn State Navy */
  --color-primary:        #1E407C;
  --color-primary-hover:  #163168;
  --color-primary-active: #0f2350;
  --color-primary-highlight: #dce5f3;

  /* Success */
  --color-success:        #2E7D32;
  --color-success-hover:  #388E3C;

  /* Error */
  --color-error:          #d32f2f;
  --color-error-hover:    #e53935;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(30,64,124,0.07);
  --shadow-md: 0 4px 12px rgba(30,64,124,0.10);
  --shadow-lg: 0 12px 32px rgba(30,64,124,0.15);
}

[data-theme="dark"] {
  --color-bg:             #0a0f1a;
  --color-surface:        #0f1825;
  --color-surface-2:      #141e2e;
  --color-surface-offset: #121a28;
  --color-surface-offset-2: #172030;
  --color-surface-dynamic: #1e2d45;
  --color-divider:        #243350;
  --color-border:         #2e4268;

  --color-text:           #e2e8f0;
  --color-text-muted:     #8fa3c0;
  --color-text-faint:     #4a6080;
  --color-text-inverse:   #0a0f1a;

  /* Primary — lighter navy for dark mode */
  --color-primary:        #4a7ec8;
  --color-primary-hover:  #6496d8;
  --color-primary-active: #3a6ab4;
  --color-primary-highlight: #1a2d50;

  --color-success:        #4CAF50;
  --color-success-hover:  #66BB6A;

  --color-error:          #ef4444;
  --color-error-hover:    #f87171;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.6);
}

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

html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  hanging-punctuation: first last;
  scroll-padding-top: 80px;
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body, sans-serif);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
ul[role="list"], ol[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }

h1, h2, h3, h4, h5, h6 {
  text-wrap: balance;
  line-height: 1.15;
  font-family: var(--font-display);
  font-weight: 700;
}
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }

::selection {
  background: rgba(30, 64, 124, 0.25);
  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;
  }
}

button { cursor: pointer; background: none; border: none; }
table { border-collapse: collapse; width: 100%; }

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

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

.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;
}