/* ========================================================
   base.css - Shared core styles for ALL pages
   (variables, reset, layout, navigation, typography, 
    buttons, shared components, animations, utilities)
   Last updated: January 2025/2026 project structure
   ======================================================== */

/* ===== Variables ===== */
:root {
  --bg0: #060615;
  --bg1: #070822;

  --text: #EEF0FF;
  --muted: rgba(238, 240, 255, 0.72);

  --p1: #7C3AED;
  --p2: #A855F7;
  --p3: #22D3EE;

  --shadow: 0 22px 80px rgba(0, 0, 0, 0.55);
  --shadow2: 0 12px 40px rgba(0, 0, 0, 0.34);

  --stroke: rgba(255, 255, 255, 0.10);
  --glass: rgba(255, 255, 255, 0.06);

  --r: 18px;
  --r2: 26px;

  --max: 1120px;
  --navH: 74px;

  --ease: cubic-bezier(0.2, 0.9, 0.2, 1);
}

/* ===== Reset & Base ===== */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'IBM Plex Sans', 'Inter', system-ui, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg0), var(--bg1) 55%, #040414);
  overflow-x: hidden;
}

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

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

/* ===== Layout ===== */
.container {
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
}

main {
  padding-top: calc(var(--navH) + 26px);
}

.page-wrap {
  padding: 26px 0 66px;
}

/* ===== Background Glows (shared across all pages) ===== */
body::before,
body::after {
  content: "";
  position: fixed;
  inset: -30%;
  z-index: -2;
  pointer-events: none;
}

body::before {
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(124,58,237,.33), transparent 55%),
    radial-gradient(900px 600px at 85% 10%, rgba(34,211,238,.16), transparent 60%),
    radial-gradient(900px 600px at 60% 90%, rgba(168,85,247,.10), transparent 65%);
  animation: bgMoveA 16s var(--ease) infinite;
}

body::after {
  background:
    radial-gradient(700px 420px at 40% 60%, rgba(255,255,255,.06), transparent 65%);
  animation: bgMoveB 20s var(--ease) infinite;
}

@keyframes bgMoveA {
  0%, 100% { transform: translate(-2%,-2%) scale(1) }
  50%      { transform: translate(2%,2%) scale(1.05) }
}

@keyframes bgMoveB {
  0%, 100% { transform: translate(1%,-1%) scale(1) }
  50%      { transform: translate(-2%,2%) scale(1.04) }
}

/* ===== Navigation (used on ALL pages) ===== */
.nav-wrap {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navH);
  z-index: 1000;
  display: flex;
  align-items: center;
  background: rgba(6,6,21,.42);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding-inline: 1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 999px;
  box-shadow: var(--shadow2);
}

.nav-links a {
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 13px;
  color: rgba(238,240,255,.82);
  transition: transform .2s var(--ease), background .2s var(--ease);
}

.nav-links a:hover {
  background: rgba(255,255,255,.06);
  transform: translateY(-1px);
}

.nav-links a.active {
  background: linear-gradient(135deg, rgba(124,58,237,.9), rgba(168,85,247,.75));
  color: #fff;
  border: 1px solid rgba(255,255,255,.14);
  box-shadow: 0 12px 30px rgba(124,58,237,.20);
}

/* ===== University of Bahrain Brand (logo + text) ===== */
.uob-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  transition: transform .25s var(--ease);
}

.uob-brand:hover,
.uob-brand:focus-visible {
  transform: translateY(-1px);
  opacity: 0.94;
}

.uob-logo {
  height: 52px;
  width: auto;
  object-fit: contain;
}

.uob-text-stack {
  display: flex;
  flex-direction: column;
  line-height: 1.24;
}

.uob-main {
  font-size: 17.5px;
  font-weight: 700;
  letter-spacing: -0.2px;
}

.uob-sub {
  font-size: 12.6px;
  color: var(--muted);
  opacity: 0.9;
}

/* ===== Typography ===== */
h1 {
  margin: 0 0 10px;
  font-size: clamp(34px, 4vw, 54px);
  line-height: 1.05;
  letter-spacing: -0.8px;
}

h2 {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.4vw, 30px);
  letter-spacing: -0.3px;
}

.sub {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
  max-width: 72ch;
  margin: 0;
}

/* ===== Buttons ===== */
.btn {
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.05);
  padding: 12px 16px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  transition: transform .2s var(--ease), background .2s var(--ease);
  box-shadow: var(--shadow2);
}

.btn:hover {
  transform: translateY(-2px);
  background: rgba(255,255,255,.07);
}

.btn.primary {
  border-color: rgba(124,58,237,.55);
  background: linear-gradient(135deg, rgba(124,58,237,.95), rgba(168,85,247,.75));
}

/* ===== Cards & Grids (shared base) ===== */
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 980px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

.card {
  border-radius: var(--r2);
  border: 1px solid rgba(255,255,255,.10);
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  box-shadow: var(--shadow2);
  padding: 18px;
}

.card h3 {
  margin: 0 0 10px;
  font-size: 14px;
}

.card p {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.85;
}

/* ===== Animations ===== */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .75s var(--ease), transform .75s var(--ease);
}

.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

.page {
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}

body.is-enter .page {
  opacity: 0;
  transform: translateY(14px);
}

body.is-leaving .page {
  opacity: 0;
  transform: translateY(-10px);
}

/* ===== Loader & Transition Overlay ===== */
.loader {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 999px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
}

.spinner {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,.25);
  border-top-color: rgba(168,85,247,.95);
  animation: spin .9s linear infinite;
}

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

/* ===== Utilities ===== */
.anchor {
  scroll-margin-top: calc(var(--navH) + 18px);
}

body.modal-open {
  overflow: hidden;
}

/* ===== Mobile adjustments for shared navigation/brand ===== */
@media (max-width: 980px) {
  .uob-logo {
    height: 44px;
  }
  .uob-main {
    font-size: 16px;
  }
  .uob-sub {
    font-size: 11.8px;
  }
  .uob-brand {
    gap: 12px;
  }
  .uob-text-stack {
    display: none;
}
}

@media (max-width: 640px) {
  .nav {
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
  }
  .nav-links {
    margin-left: auto;
    margin-right: auto;
  }
}