/* ═══════════════════════════════════════════════════════════
   IEEE UJ-AQ — Design System Tokens & Utilities
   ═══════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=Space+Grotesk:wght@500;600;700&display=swap');

:root {
  /* ── Core palette ── */
  --nt-blue: #00629B;
  --nt-blue-dark: #003F6B;
  --nt-blue-deep: #001D3D;
  --nt-gold: #FDB515;
  --nt-gold-warm: #F59E0B;
  --nt-cyan: #00A6D6;
  --nt-violet: #7057D2;
  --nt-danger: #DC2626;
  --nt-success: #16A34A;

  /* ── Surfaces (light) ── */
  --nt-bg: #F5F7FA;
  --nt-surface: #FFFFFF;
  --nt-surface2: #EEF3F8;
  --nt-surface3: #E2E8F0;
  --nt-text: #0F172A;
  --nt-text-secondary: #334155;
  --nt-muted: #64748B;
  --nt-border: rgba(148, 163, 184, 0.25);
  --nt-border-strong: rgba(148, 163, 184, 0.45);

  /* ── Glassmorphism ── */
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-bg-strong: rgba(255, 255, 255, 0.82);
  --glass-border: rgba(255, 255, 255, 0.45);
  --glass-blur: 20px;

  /* ── Glow / Accent ── */
  --glow-blue: rgba(0, 98, 155, 0.35);
  --glow-gold: rgba(253, 181, 21, 0.3);
  --glow-cyan: rgba(0, 166, 214, 0.25);

  /* ── Gradients ── */
  --gradient-hero: linear-gradient(135deg, #001D3D 0%, #003F6B 40%, #00629B 100%);
  --gradient-hero-accent: linear-gradient(135deg, rgba(0, 166, 214, 0.15), rgba(253, 181, 21, 0.12));
  --gradient-blue: linear-gradient(135deg, #00629B, #00A6D6);
  --gradient-gold: linear-gradient(135deg, #FDB515, #F59E0B);
  --gradient-card: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(238,243,248,0.7));
  --gradient-cta: linear-gradient(135deg, #00629B, #00A6D6, #00629B);

  /* ── Shadows ── */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-card: 0 8px 32px rgba(0, 63, 107, 0.08);
  --shadow-soft: 0 16px 48px rgba(0, 63, 107, 0.1);
  --shadow-elevated: 0 24px 64px rgba(0, 63, 107, 0.14);
  --shadow-glow-blue: 0 8px 32px rgba(0, 98, 155, 0.3);
  --shadow-glow-gold: 0 8px 32px rgba(253, 181, 21, 0.25);
  --shadow-3d: 0 20px 40px -12px rgba(0, 0, 0, 0.15);

  /* ── Easing ── */
  --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);

  /* ── Sizing ── */
  --nav-height: 72px;
  --nav-height-scrolled: 60px;
  --container-max: 1200px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 999px;

  /* ── Page transition ── */
  --page-transition-duration: 400ms;

  color-scheme: light;
}

/* ═══════════════════════════════════════════════════════════
   DARK MODE
   ═══════════════════════════════════════════════════════════ */
[data-theme="dark"] {
  --nt-bg: #0B1120;
  --nt-surface: #131B2E;
  --nt-surface2: #1A2340;
  --nt-surface3: #243052;
  --nt-text: #E8ECF4;
  --nt-text-secondary: #B4BCD0;
  --nt-muted: #8892A8;
  --nt-border: rgba(100, 120, 160, 0.2);
  --nt-border-strong: rgba(100, 120, 160, 0.35);

  --glass-bg: rgba(19, 27, 46, 0.72);
  --glass-bg-strong: rgba(19, 27, 46, 0.88);
  --glass-border: rgba(100, 120, 160, 0.2);

  --glow-blue: rgba(0, 166, 214, 0.25);
  --glow-gold: rgba(253, 181, 21, 0.2);

  --gradient-card: linear-gradient(135deg, rgba(26, 35, 64, 0.9), rgba(19, 27, 46, 0.7));

  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.25);
  --shadow-soft: 0 16px 48px rgba(0, 0, 0, 0.3);
  --shadow-elevated: 0 24px 64px rgba(0, 0, 0, 0.4);

  color-scheme: dark;
}

/* ═══════════════════════════════════════════════════════════
   RESET & BASE
   ═══════════════════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--nt-text);
  background: var(--nt-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 400ms var(--ease-smooth), color 400ms var(--ease-smooth);
}

html[dir="rtl"] body { font-family: "Segoe UI", Tahoma, Arial, sans-serif; }

h1, h2, h3, h4, h5, h6 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

a { color: inherit; text-decoration: none; transition: color 200ms var(--ease-smooth); }
img { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; }
textarea { min-height: 120px; resize: vertical; }

/* ═══════════════════════════════════════════════════════════
   LAYOUT UTILITIES
   ═══════════════════════════════════════════════════════════ */
.container { width: min(var(--container-max), calc(100% - 2rem)); margin-inline: auto; }
.grid { display: grid; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

/* ── Color utilities ── */
.text-nt-text { color: var(--nt-text); }
.text-nt-muted { color: var(--nt-muted); }
.text-nt-blue { color: var(--nt-blue); }
.text-nt-gold { color: var(--nt-gold); }
.bg-nt-surface { background: var(--nt-surface); }
.bg-nt-surface2 { background: var(--nt-surface2); }
.bg-nt-blue { background: var(--nt-blue); }
.border-nt-border { border-color: var(--nt-border); }

/* ── Spacing ── */
.mb-4 { margin-bottom: 1rem; }
.mt-8 { margin-top: 2rem; }
.px-6 { padding-inline: 1.5rem; }
.py-4 { padding-block: 1rem; }

/* ── Shape ── */
.rounded-xl { border-radius: var(--radius-md); }
.rounded-2xl { border-radius: var(--radius-lg); }
.shadow-soft { box-shadow: var(--shadow-soft); }
.full-width { width: 100%; }
.centered { text-align: center; display: grid; place-items: center; gap: 1rem; }
.muted { color: var(--nt-muted); }
.large-icon { font-size: 3rem; color: var(--nt-blue); }

/* ═══════════════════════════════════════════════════════════
   BUTTONS
   ═══════════════════════════════════════════════════════════ */
.button, .icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 0;
  cursor: pointer;
  min-height: 46px;
  border-radius: var(--radius-full);
  font-weight: 700;
  letter-spacing: 0.01em;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  transition: transform 300ms var(--ease-spring),
              box-shadow 300ms var(--ease-smooth),
              background 200ms var(--ease-smooth);
}

.button { padding: 0.75rem 1.5rem; font-size: 0.92rem; }
.button-small { min-height: 36px; padding: 0.45rem 1rem; font-size: 0.84rem; }

.button-primary {
  color: white;
  background: var(--gradient-blue);
  box-shadow: var(--shadow-glow-blue);
}
.button-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,0.2) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform 600ms var(--ease-out-expo);
  z-index: -1;
}
.button-primary:hover::before { transform: translateX(100%); }

.button-gold {
  color: var(--nt-blue-deep);
  background: var(--gradient-gold);
  box-shadow: var(--shadow-glow-gold);
}

.button-ghost {
  color: var(--nt-text-secondary);
  background: var(--glass-bg);
  border: 1px solid var(--nt-border);
  backdrop-filter: blur(12px);
}

.button:hover, .icon-button:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-elevated);
}
.button:active { transform: translateY(-1px) scale(0.98); }

.icon-button {
  width: 44px;
  height: 44px;
  color: var(--nt-text-secondary);
  background: var(--glass-bg);
  border: 1px solid var(--nt-border);
  backdrop-filter: blur(12px);
}
.icon-button.danger { color: var(--nt-danger); }

/* ═══════════════════════════════════════════════════════════
   PILLS / CHIPS / BADGES
   ═══════════════════════════════════════════════════════════ */
.pill, .filter-chip, .status, .permission-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  min-height: 30px;
  border-radius: var(--radius-full);
  padding: 0.35rem 0.85rem;
  color: var(--nt-blue);
  background: rgba(0, 98, 155, 0.08);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  border: 1px solid rgba(0, 98, 155, 0.12);
  transition: all 300ms var(--ease-smooth);
}

.filter-chip {
  cursor: pointer;
  background: var(--glass-bg);
  border: 1px solid var(--nt-border);
  color: var(--nt-muted);
  backdrop-filter: blur(12px);
}
.filter-chip:hover {
  background: rgba(0, 98, 155, 0.08);
  color: var(--nt-blue);
  border-color: rgba(0, 98, 155, 0.2);
  transform: translateY(-2px);
}
.filter-chip.active, .language-toggle .active {
  color: white;
  background: var(--gradient-blue);
  border-color: transparent;
  box-shadow: var(--shadow-glow-blue);
}

.alert { padding: 0.85rem 1rem; border-radius: var(--radius-md); margin-block: 0.75rem; }
.alert-error, .toast-error { color: #7f1d1d; background: #fee2e2; }
.alert-warning { color: #713f12; background: #fef3c7; }
.toast-success { color: #064e3b; background: #dcfce7; }

/* ═══════════════════════════════════════════════════════════
   FORMS
   ═══════════════════════════════════════════════════════════ */
label {
  display: grid;
  gap: 0.4rem;
  color: var(--nt-muted);
  font-weight: 600;
  font-size: 0.88rem;
}

input, select, textarea {
  width: 100%;
  border: 1px solid var(--nt-border);
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  color: var(--nt-text);
  padding: 0.8rem 1rem;
  outline: none;
  backdrop-filter: blur(8px);
  transition: border-color 250ms var(--ease-smooth),
              box-shadow 250ms var(--ease-smooth),
              background 250ms var(--ease-smooth);
}
input:focus, select:focus, textarea:focus {
  border-color: var(--nt-cyan);
  box-shadow: 0 0 0 4px rgba(0, 166, 214, 0.12), var(--shadow-sm);
  background: var(--glass-bg-strong);
}

input[type="checkbox"],
input[type="radio"] {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  min-height: 0;
  margin: 0;
  padding: 0;
  accent-color: var(--nt-cyan);
  box-shadow: none;
  backdrop-filter: none;
}

input[type="checkbox"]:focus,
input[type="radio"]:focus {
  box-shadow: 0 0 0 3px rgba(0, 166, 214, 0.18);
}

.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.stack { display: grid; gap: 1rem; }
.toggle-row, .checkbox-row, .action-row, .template-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.check-row,
.mini-check,
.toggle-row label,
.checkbox-row,
.checkbox-row label,
.inline-create-form label:has(input[type="checkbox"]),
.admin-form label:has(input[type="checkbox"]) {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  width: fit-content;
}

.check-row {
  width: 100%;
  padding: 0.8rem 0.95rem;
  border: 1px solid var(--nt-border);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--nt-surface2) 70%, transparent);
  color: var(--nt-text-secondary);
  cursor: pointer;
}

.check-row span,
.mini-check span {
  min-width: 0;
}

.mini-check {
  min-height: 34px;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--nt-border);
  border-radius: var(--radius-full);
  background: var(--glass-bg);
  color: var(--nt-text-secondary);
  font-size: 0.78rem;
  font-weight: 800;
}

.toast-stack {
  position: fixed;
  top: calc(var(--nav-height, 72px) + 14px);
  inset-inline-end: 1rem;
  z-index: 1000;
  display: grid;
  gap: 0.6rem;
  width: min(420px, calc(100vw - 2rem));
  pointer-events: none;
}

.admin-body .toast-stack {
  top: 5.25rem;
}

.toast {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--nt-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  font-weight: 750;
  line-height: 1.35;
  pointer-events: auto;
  backdrop-filter: blur(14px);
}

.toast-success {
  color: #064e3b;
  background: rgba(220, 252, 231, 0.96);
  border-color: rgba(34, 197, 94, 0.32);
}

.toast-error {
  color: #7f1d1d;
  background: rgba(254, 226, 226, 0.96);
  border-color: rgba(220, 38, 38, 0.26);
}

/* ═══════════════════════════════════════════════════════════
   PAGE TRANSITION
   ═══════════════════════════════════════════════════════════ */
.page-transition-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--nt-bg);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--page-transition-duration) var(--ease-smooth);
}
.page-transition-overlay.is-active {
  opacity: 1;
  pointer-events: all;
}

/* Page content fade-in on load */
.site-body {
  opacity: 0;
  animation: pageLoadIn 600ms var(--ease-out-expo) forwards;
  animation-delay: 100ms;
}
@keyframes pageLoadIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ═══════════════════════════════════════════════════════════
   DARK MODE TOGGLE
   ═══════════════════════════════════════════════════════════ */
.theme-toggle {
  width: 44px;
  height: 44px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--nt-border);
  border-radius: var(--radius-full);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  cursor: pointer;
  color: var(--nt-gold);
  font-size: 1.15rem;
  transition: all 300ms var(--ease-spring);
}
.theme-toggle:hover {
  transform: rotate(30deg) scale(1.1);
  box-shadow: var(--shadow-glow-gold);
}
[data-theme="dark"] .theme-toggle { color: var(--nt-cyan); }
[data-theme="dark"] .theme-toggle:hover { box-shadow: 0 0 24px var(--glow-cyan); }

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════ */
@media (max-width: 760px) {
  .form-grid { grid-template-columns: 1fr; }
  .button { width: 100%; }
}