/* ==========================================================================
   EduBridgeSA — Shared Brand & Design System
   --------------------------------------------------------------------------
   Additive layer that sits on top of the mandatory responsive foundation:

       responsive-system.css  -> layout primitives, shell, nav, tables
       design-tokens.css      -> neutral/spacing/type scales
       surface-contrast.css   -> light/dark surface text pairing
       edubridge-brand.css    -> THIS FILE: brand identity + components

   Rules for this file:
   - Every token is prefixed `--eui-`, every component `.eui-`.
     Nothing here can collide with, or restyle, existing markup.
   - No bare element selectors. No layout shells. No header/footer/nav.
   - Presentation only: no behaviour, no data, no auth.
   ========================================================================== */

:root {
  /* ---------- Brand palette (official EduBridgeSA colours) ---------- */
  --eui-orange-100: #fff1e3;
  --eui-orange-200: #ffd9b0;
  --eui-orange-400: #ffa733;
  --eui-orange-500: #ff7b00;   /* official orange */
  --eui-orange-600: #e86e00;
  --eui-orange-700: #b34e00;   /* AA-safe orange text on light */

  --eui-green-100: #d9fff0;
  --eui-green-300: #66ffb8;
  --eui-green-500: #00ff88;    /* official bright green — dark surfaces only */
  --eui-green-600: #00c96b;
  --eui-green-700: #00794a;    /* AA-safe green text on light */

  --eui-blue-100: #e8f0fb;
  --eui-blue-200: #c5dcf6;
  --eui-blue-300: #7db0ea;
  --eui-blue-400: #3d84d6;
  --eui-blue-500: #1a5fb4;     /* official blue */
  --eui-blue-600: #164f96;
  --eui-blue-700: #123e75;

  --eui-navy-900: #060f1c;
  --eui-navy-800: #0a1628;     /* page base */
  --eui-navy-700: #0f1f38;
  --eui-navy-600: #16294a;
  --eui-navy-500: #1e355c;

  --eui-white: #ffffff;
  --eui-ink: #0f172a;
  --eui-ink-soft: #334155;
  --eui-ink-muted: #55657d;

  /* ---------- Semantic text (contrast-checked pairs) ---------- */
  --eui-on-light: var(--eui-ink);
  --eui-on-light-soft: var(--eui-ink-soft);
  --eui-on-light-muted: var(--eui-ink-muted);          /* 5.2:1 on white */
  --eui-on-dark: #f4f8ff;                              /* 16:1 on navy    */
  --eui-on-dark-soft: #cfdcef;                         /* 11:1 on navy    */
  --eui-on-dark-muted: #a9bcd6;                        /* 8.5:1 on navy   */
  --eui-link-on-light: var(--eui-blue-600);
  --eui-link-on-dark: #8fc0f5;

  /* ---------- Gradients ---------- */
  --eui-gradient-brand: linear-gradient(135deg, var(--eui-orange-500) 0%, var(--eui-orange-400) 100%);
  --eui-gradient-depth: linear-gradient(160deg, var(--eui-navy-700) 0%, var(--eui-navy-900) 100%);
  --eui-gradient-blue: linear-gradient(135deg, var(--eui-blue-500) 0%, var(--eui-blue-700) 100%);
  --eui-gradient-sheen: linear-gradient(120deg, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.14) 45%, rgba(255, 255, 255, 0) 100%);

  /* ---------- Surfaces ---------- */
  --eui-surface-light: #ffffff;
  --eui-surface-light-alt: #f7f9fd;
  --eui-surface-border-light: rgba(15, 23, 42, 0.1);
  --eui-glass-dark: rgba(255, 255, 255, 0.06);
  --eui-glass-dark-strong: rgba(255, 255, 255, 0.1);
  --eui-glass-border: rgba(255, 255, 255, 0.14);

  /* ---------- Typography ---------- */
  --eui-font-display: 'Poppins', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --eui-font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --eui-weight-regular: 400;
  --eui-weight-medium: 500;
  --eui-weight-semibold: 600;
  --eui-weight-bold: 700;
  /* Production loads Poppins 600/700 only — avoid faux-bolding headings. */
  --eui-weight-heavy: 700;

  --eui-text-eyebrow: 0.75rem;
  --eui-text-caption: 0.8125rem;
  --eui-text-sm: 0.875rem;
  --eui-text-base: 1rem;
  --eui-text-lede: clamp(1rem, 0.95rem + 0.3vw, 1.125rem);
  --eui-text-h3: clamp(1.125rem, 1.05rem + 0.4vw, 1.3125rem);
  --eui-text-h2: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --eui-text-h1: clamp(2rem, 1.5rem + 2.4vw, 3.25rem);

  --eui-tracking-tight: -0.025em;
  --eui-tracking-wide: 0.08em;

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

  /* ---------- Radius ---------- */
  --eui-radius-xs: 0.375rem;
  --eui-radius-sm: 0.625rem;
  --eui-radius-md: 0.875rem;
  --eui-radius-lg: 1.125rem;
  --eui-radius-xl: 1.5rem;
  --eui-radius-pill: 999px;

  /* ---------- Elevation ---------- */
  --eui-shadow-sm: 0 1px 2px rgba(2, 6, 23, 0.06), 0 1px 3px rgba(2, 6, 23, 0.08);
  --eui-shadow-md: 0 6px 18px -8px rgba(2, 6, 23, 0.25);
  --eui-shadow-lg: 0 22px 48px -26px rgba(2, 6, 23, 0.45);
  --eui-shadow-xl: 0 34px 70px -34px rgba(2, 6, 23, 0.6);
  --eui-glow-orange: 0 16px 38px -18px rgba(255, 123, 0, 0.65);
  --eui-glow-blue: 0 16px 38px -18px rgba(26, 95, 180, 0.6);

  /* ---------- Motion ---------- */
  --eui-duration-fast: 140ms;
  --eui-duration-base: 240ms;
  --eui-duration-slow: 420ms;
  --eui-duration-reveal: 620ms;
  --eui-ease-standard: cubic-bezier(0.22, 0.61, 0.36, 1);
  --eui-ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --eui-ease-spring: cubic-bezier(0.34, 1.36, 0.64, 1);

  /* ---------- Focus ---------- */
  --eui-focus-ring: 0 0 0 3px rgba(26, 95, 180, 0.45);
  --eui-focus-ring-dark: 0 0 0 3px rgba(255, 167, 51, 0.55);

  /* ---------- Component defaults ---------- */
  --eui-control-height: 3rem;
  --eui-control-radius: var(--eui-radius-md);
}

/* ==========================================================================
   1. Typography utilities
   ========================================================================== */

.eui-display {
  font-family: var(--eui-font-display);
  font-size: var(--eui-text-h1);
  font-weight: var(--eui-weight-heavy);
  line-height: 1.05;
  letter-spacing: var(--eui-tracking-tight);
  margin: 0;
}

.eui-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--eui-space-2);
  margin: 0;
  font-family: var(--eui-font-body);
  font-size: var(--eui-text-eyebrow);
  font-weight: var(--eui-weight-bold);
  letter-spacing: var(--eui-tracking-wide);
  text-transform: uppercase;
}

.eui-lede {
  font-size: var(--eui-text-lede);
  line-height: 1.65;
  margin: 0;
}

.eui-muted-on-dark { color: var(--eui-on-dark-muted); }
.eui-muted-on-light { color: var(--eui-on-light-muted); }

/* ==========================================================================
   2. Buttons
   ========================================================================== */

.eui-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: var(--eui-control-height);
  padding: 0.7rem 1.35rem;
  border: 1px solid transparent;
  border-radius: var(--eui-control-radius);
  font-family: var(--eui-font-body);
  font-size: var(--eui-text-sm);
  font-weight: var(--eui-weight-bold);
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  position: relative;
  isolation: isolate;
  transition:
    transform var(--eui-duration-base) var(--eui-ease-standard),
    box-shadow var(--eui-duration-base) var(--eui-ease-standard),
    background-color var(--eui-duration-base) var(--eui-ease-standard),
    border-color var(--eui-duration-base) var(--eui-ease-standard),
    color var(--eui-duration-base) var(--eui-ease-standard);
}

.eui-btn:focus-visible {
  outline: 3px solid var(--eui-orange-400);
  outline-offset: 3px;
}

/* Primary action: official orange with navy label (7:1, AA and beyond). */
.eui-btn--primary {
  background: var(--eui-gradient-brand);
  color: var(--eui-navy-900);
  box-shadow: var(--eui-glow-orange);
}

.eui-btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 22px 44px -18px rgba(255, 123, 0, 0.75);
}

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

.eui-btn--blue {
  background: var(--eui-gradient-blue);
  color: var(--eui-white);
  box-shadow: var(--eui-glow-blue);
}

.eui-btn--blue:hover {
  transform: translateY(-2px);
}

.eui-btn--ghost {
  background: transparent;
  border-color: var(--eui-surface-border-light);
  color: var(--eui-on-light);
}

.eui-btn--ghost:hover {
  background: rgba(15, 23, 42, 0.04);
  border-color: rgba(15, 23, 42, 0.2);
}

.eui-btn--on-dark {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--eui-glass-border);
  color: var(--eui-on-dark);
}

.eui-btn--on-dark:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.28);
}

.eui-btn--block { width: 100%; }

.eui-btn--lg {
  min-height: 3.35rem;
  font-size: var(--eui-text-base);
  padding-inline: 1.6rem;
}

.eui-btn[disabled],
.eui-btn[aria-disabled='true'] {
  cursor: not-allowed;
  opacity: 0.62;
  transform: none;
  box-shadow: none;
}

/* ==========================================================================
   3. Surfaces: cards, tiles, panels
   ========================================================================== */

.eui-card {
  min-width: 0;
  padding: var(--eui-space-5);
  border-radius: var(--eui-radius-lg);
  border: 1px solid var(--eui-surface-border-light);
  background: var(--eui-surface-light);
  box-shadow: var(--eui-shadow-md);
  color: var(--eui-on-light);
}

.eui-card > :first-child { margin-top: 0; }
.eui-card > :last-child { margin-bottom: 0; }

.eui-card--glass-on-dark {
  background: var(--eui-glass-dark);
  border-color: var(--eui-glass-border);
  color: var(--eui-on-dark);
  box-shadow: var(--eui-shadow-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.eui-card--interactive {
  transition:
    transform var(--eui-duration-base) var(--eui-ease-out),
    box-shadow var(--eui-duration-base) var(--eui-ease-out),
    border-color var(--eui-duration-base) var(--eui-ease-out);
}

.eui-card--interactive:hover {
  transform: translateY(-4px);
  box-shadow: var(--eui-shadow-lg);
  border-color: rgba(255, 123, 0, 0.35);
}

/* Icon tile used inside cards, benefits, feature lists. */
.eui-icon-tile {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--eui-radius-md);
  background: var(--eui-blue-100);
  color: var(--eui-blue-600);
  font-size: 1.0625rem;
}

.eui-icon-tile--orange {
  background: var(--eui-orange-100);
  color: var(--eui-orange-700);
}

.eui-icon-tile--green {
  background: var(--eui-green-100);
  color: var(--eui-green-700);
}

.eui-icon-tile--on-dark {
  background: rgba(255, 255, 255, 0.1);
  color: var(--eui-green-500);
  border: 1px solid var(--eui-glass-border);
}

/* ==========================================================================
   4. Badges & chips
   ========================================================================== */

.eui-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.28rem 0.7rem;
  border-radius: var(--eui-radius-pill);
  font-size: var(--eui-text-eyebrow);
  font-weight: var(--eui-weight-bold);
  letter-spacing: var(--eui-tracking-wide);
  text-transform: uppercase;
  white-space: nowrap;
}

.eui-badge--orange {
  background: var(--eui-orange-100);
  color: var(--eui-orange-700);
}

.eui-badge--green {
  background: var(--eui-green-100);
  color: var(--eui-green-700);
}

.eui-badge--blue {
  background: var(--eui-blue-100);
  color: var(--eui-blue-700);
}

.eui-badge--on-dark {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--eui-glass-border);
  color: var(--eui-on-dark);
}

/* ==========================================================================
   5. Form controls
   ========================================================================== */

.eui-field {
  display: grid;
  gap: var(--eui-space-2);
  min-width: 0;
}

.eui-label {
  font-size: var(--eui-text-caption);
  font-weight: var(--eui-weight-bold);
  letter-spacing: 0.03em;
  color: var(--eui-on-dark-soft);
}

.eui-hint {
  font-size: var(--eui-text-caption);
  color: var(--eui-on-dark-muted);
}

.eui-input {
  width: 100%;
  min-height: var(--eui-control-height);
  padding: 0.7rem 0.95rem;
  border-radius: var(--eui-control-radius);
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(4, 12, 24, 0.55);
  color: var(--eui-on-dark);
  font: inherit;
  transition:
    border-color var(--eui-duration-fast) var(--eui-ease-standard),
    box-shadow var(--eui-duration-fast) var(--eui-ease-standard),
    background-color var(--eui-duration-fast) var(--eui-ease-standard);
}

.eui-input::placeholder { color: #93a7c2; opacity: 1; }

.eui-input:hover { border-color: rgba(255, 255, 255, 0.3); }

.eui-input:focus {
  outline: none;
  border-color: var(--eui-orange-400);
  background: rgba(4, 12, 24, 0.78);
  box-shadow: var(--eui-focus-ring-dark);
}

.eui-input[aria-invalid='true'] {
  border-color: #ff9a9a;
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.3);
}

.eui-check {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 2.75rem;
  cursor: pointer;
  font-size: var(--eui-text-sm);
  color: var(--eui-on-dark-soft);
}

.eui-check input[type='checkbox'] {
  inline-size: 1.15rem;
  block-size: 1.15rem;
  flex: 0 0 auto;
  border-radius: 0.35rem;
  accent-color: var(--eui-orange-500);
  cursor: pointer;
}

.eui-check input[type='checkbox']:focus-visible {
  outline: 2px solid var(--eui-orange-400);
  outline-offset: 2px;
}

/* ==========================================================================
   6. Alerts
   ========================================================================== */

.eui-alert {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.85rem 1rem;
  border-radius: var(--eui-radius-md);
  border: 1px solid transparent;
  font-size: var(--eui-text-sm);
  line-height: 1.5;
}

.eui-alert__icon {
  flex: 0 0 auto;
  margin-top: 0.1rem;
  font-size: 0.95rem;
  line-height: 1;
}

.eui-alert--error {
  background: rgba(153, 27, 27, 0.26);
  border-color: rgba(248, 113, 113, 0.5);
  color: #ffe4e4;
}

.eui-alert--warning {
  background: rgba(180, 83, 9, 0.24);
  border-color: rgba(251, 191, 36, 0.45);
  color: #fff2cf;
}

.eui-alert--success {
  background: rgba(6, 95, 70, 0.32);
  border-color: rgba(52, 211, 153, 0.45);
  color: #e8fff2;
}

.eui-alert--info {
  background: rgba(26, 95, 180, 0.24);
  border-color: rgba(125, 176, 234, 0.45);
  color: #e6f0ff;
}

/* ==========================================================================
   7. Media
   ========================================================================== */

.eui-media {
  position: relative;
  overflow: hidden;
  border-radius: var(--eui-radius-xl);
  background: var(--eui-navy-700);
}

.eui-media > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.eui-media--4x3 { aspect-ratio: 4 / 3; }
.eui-media--3x2 { aspect-ratio: 3 / 2; }
.eui-media--16x9 { aspect-ratio: 16 / 9; }

/* ==========================================================================
   8. Motion utilities
   Opt-in only. JS adds `.is-visible`; without JS the content is simply shown.
   ========================================================================== */

.eui-reveal {
  opacity: 1;
  transform: none;
}

.eui-js .eui-reveal {
  opacity: 0;
  transform: translateY(1.25rem);
  transition:
    opacity var(--eui-duration-reveal) var(--eui-ease-out),
    transform var(--eui-duration-reveal) var(--eui-ease-out);
  transition-delay: var(--eui-reveal-delay, 0ms);
}

.eui-js .eui-reveal.is-visible {
  opacity: 1;
  transform: none;
}

@keyframes eui-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-0.5rem); }
}

@keyframes eui-spin {
  to { transform: rotate(360deg); }
}

@keyframes eui-pulse-ring {
  0% { box-shadow: 0 0 0 0 rgba(255, 123, 0, 0.45); }
  70% { box-shadow: 0 0 0 12px rgba(255, 123, 0, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 123, 0, 0); }
}

.eui-spin { animation: eui-spin 0.9s linear infinite; }

/* ==========================================================================
   9. Accessibility
   ========================================================================== */

.eui-visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  .eui-js .eui-reveal,
  .eui-js .eui-reveal.is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .eui-card--interactive:hover,
  .eui-btn--primary:hover,
  .eui-btn--blue:hover {
    transform: none;
  }

  .eui-spin { animation-duration: 2.4s; }
}

@media (prefers-contrast: more) {
  .eui-btn,
  .eui-input,
  .eui-card {
    border-width: 2px;
  }
}