/* =========================================================
   NST Campus — colour themes
   Loaded after styles.css. assets/js/theme.js sets
   <html data-theme="..."> and remembers the visitor's choice.

   Every theme only redefines the variables styles.css already
   uses (--blue = primary, --gold = accent, --paper, --dark),
   plus a few new ones:
     --grad-2  second gradient colour
     --pop     extra highlight colour (4th category colour)
     --card    card / panel background
     --muted   secondary text
     --ink     dark text placed on top of the accent colour
   ========================================================= */

html[data-theme] {
  --card: #ffffff;
  --muted: #555555;
  --ink: #1a202c;
  --line: #e5e7eb;
  --grad-2: #1e6f9f;
  --pop: #10b981;
}

/* Classic — the original navy & gold */
html[data-theme="classic"] {
  --blue: #2c3e50;
  --gold: #d4af37;
  --paper: #f4f4f9;
  --dark: #1a202c;
  --grad-2: #1e6f9f;
  --pop: #16a085;
}

/* Ocean — blues & turquoise */
html[data-theme="ocean"] {
  --blue: #0369a1;
  --gold: #06b6d4;
  --paper: #f0f9ff;
  --dark: #0c1a2b;
  --grad-2: #4f46e5;
  --pop: #14b8a6;
  --primary-orange: #0369a1;
}

/* Sunset — orange, amber & pink */
html[data-theme="sunset"] {
  --blue: #c2410c;
  --gold: #f59e0b;
  --paper: #fff7ed;
  --dark: #2a1508;
  --grad-2: #db2777;
  --pop: #e11d48;
  --primary-orange: #c2410c;
}

/* Emerald — greens & lime */
html[data-theme="emerald"] {
  --blue: #047857;
  --gold: #a3e635;
  --paper: #f0fdf4;
  --dark: #0b2217;
  --grad-2: #0e7490;
  --pop: #f59e0b;
  --primary-orange: #047857;
}

/* Royal — purple, indigo & pink */
html[data-theme="royal"] {
  --blue: #6d28d9;
  --gold: #f472b6;
  --paper: #f5f3ff;
  --dark: #1e1033;
  --grad-2: #2563eb;
  --pop: #f59e0b;
  --primary-orange: #6d28d9;
}

/* Berry — magenta, violet & sunflower */
html[data-theme="berry"] {
  --blue: #be185d;
  --gold: #fbbf24;
  --paper: #fdf2f8;
  --dark: #2b0a1a;
  --grad-2: #7c3aed;
  --pop: #0891b2;
  --primary-orange: #be185d;
}

/* Midnight — dark mode with electric blue & amber */
html[data-theme="midnight"] {
  --blue: #3b82f6;
  --gold: #fbbf24;
  --paper: #0b1120;
  --dark: #e2e8f0;          /* body text is light in dark mode */
  --light: #ffffff;
  --card: #151e32;
  --muted: #a3b1c6;
  --ink: #0b1120;
  --line: #26324a;
  --grad-2: #8b5cf6;
  --pop: #22d3ee;
  --primary-orange: #3b82f6;
  --bg-color: #0b1120;       /* login.php */
  --text-dark: #e2e8f0;      /* login.php */
  --text-gray: #a3b1c6;      /* login.php */
  --border-color: #26324a;   /* login.php */
  color-scheme: dark;
}

/* ---------------------------------------------------------
   Colourful touches shared by every theme
--------------------------------------------------------- */

html[data-theme] body { transition: background-color .3s ease, color .3s ease; }

/* Gradient top bar + a thin rainbow strip under the header */
html[data-theme] .utility-bar {
  background: linear-gradient(90deg, var(--blue), var(--grad-2));
}
html[data-theme] .site-header { background: var(--card); }
html[data-theme] .site-header::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--grad-2), var(--gold), var(--pop));
}

html[data-theme] .login-btn,
html[data-theme] .action-download {
  background: linear-gradient(135deg, var(--blue), var(--grad-2));
}
html[data-theme] .login-btn:hover,
html[data-theme] .action-download:hover {
  background: var(--gold);
  color: var(--ink) !important;
}
html[data-theme] .btn-gold {
  background: linear-gradient(135deg, var(--gold), var(--pop));
  color: var(--ink);
  box-shadow: 0 8px 22px -8px var(--gold);
}
html[data-theme] .btn-gold:hover { filter: brightness(1.08); }
html[data-theme] .lang-btn.is-active,
html[data-theme] .ticker-label { color: var(--ink); }

/* Hero: tint the photo overlay with the theme colours */
html[data-theme] .slide-overlay {
  background: linear-gradient(120deg,
    rgba(0, 0, 0, .78) 0%,
    color-mix(in srgb, var(--blue) 70%, transparent) 60%,
    color-mix(in srgb, var(--grad-2) 60%, transparent) 100%);
}

/* Ticker */
html[data-theme] .ticker { background: linear-gradient(90deg, #0f172a, color-mix(in srgb, var(--blue) 45%, #0f172a)); color: #fff; }

/* Softly tinted alternating sections */
html[data-theme] .news-section,
html[data-theme] .partner-section {
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--blue) 6%, var(--paper)),
    var(--paper));
}

/* Filter chips */
html[data-theme] .filter-chip,
html[data-theme] .filter-btn { background: var(--card); border-color: var(--line); color: var(--blue); }
html[data-theme] .filter-chip:hover,
html[data-theme] .filter-btn:hover { border-color: var(--blue); background: color-mix(in srgb, var(--blue) 8%, var(--card)); color: var(--blue); }
html[data-theme] .filter-chip.is-active,
html[data-theme] .filter-btn.active {
  background: linear-gradient(135deg, var(--blue), var(--grad-2));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 6px 16px -6px var(--blue);
}

/* Cards */
html[data-theme] .news-card,
html[data-theme] .course-card,
html[data-theme] .partner-card,
html[data-theme] .contact-list li,
html[data-theme] .table-card { background: var(--card); }

/* One colour per news category */
html[data-theme] .news-card { --cat: var(--gold); border-top-color: var(--cat); }
html[data-theme] .news-card[data-category="circular"]    { --cat: var(--blue); }
html[data-theme] .news-card[data-category="event"]       { --cat: var(--grad-2); }
html[data-theme] .news-card[data-category="achievement"] { --cat: var(--gold); }
html[data-theme] .news-card[data-category="sports"]      { --cat: var(--pop); }
html[data-theme] .news-tag {
  background: color-mix(in srgb, var(--cat) 15%, var(--card));
  color: color-mix(in srgb, var(--cat) 75%, var(--dark));
}

/* One colour per course category */
html[data-theme] .course-card { --cat: var(--blue); border-bottom: 4px solid var(--cat); }
html[data-theme] .course-card[data-category="al_ict"]       { --cat: var(--blue); }
html[data-theme] .course-card[data-category="grade_10_11"]  { --cat: var(--grad-2); }
html[data-theme] .course-card[data-category="grade_6_9"]    { --cat: var(--pop); }
html[data-theme] .course-card[data-category="kids_program"] { --cat: var(--gold); }
html[data-theme] .course-tag {
  background: color-mix(in srgb, var(--cat) 15%, var(--card));
  color: color-mix(in srgb, var(--cat) 75%, var(--dark));
}
html[data-theme] .course-banner-wrap { background: linear-gradient(135deg, var(--blue), var(--grad-2)); }

html[data-theme] .partner-card:nth-child(1) { border-bottom-color: var(--blue); }
html[data-theme] .partner-card:nth-child(2) { border-bottom-color: var(--grad-2); }

/* Exam page header + contact tiles */
html[data-theme] .page-header { background: linear-gradient(120deg, var(--blue), var(--grad-2)); }
html[data-theme] .contact-list li { border-left: 4px solid var(--gold); }
html[data-theme] .contact-list li:nth-child(2) { border-left-color: var(--blue); }
html[data-theme] .contact-list li:nth-child(3) { border-left-color: var(--grad-2); }
html[data-theme] .contact-list li:nth-child(4) { border-left-color: var(--pop); }

html[data-theme] .testimonial-avatar-fallback { background: linear-gradient(135deg, var(--blue), var(--grad-2)); }
html[data-theme] .testimonial-dot.active { background: linear-gradient(90deg, var(--gold), var(--pop)); }

/* Footer glows follow the theme */
html[data-theme] .footer-glow-1 { background: var(--blue); }
html[data-theme] .footer-glow-2 { background: var(--grad-2); }
html[data-theme] .footer-socials a:hover { background: linear-gradient(45deg, var(--blue), var(--grad-2)); }

/* Login page (login.php has its own variables — see theme blocks) */
html[data-theme]:not([data-theme="classic"]) body.login-page {
  background:
    radial-gradient(circle at 15% 20%, color-mix(in srgb, var(--blue) 22%, transparent), transparent 45%),
    radial-gradient(circle at 85% 80%, color-mix(in srgb, var(--grad-2) 22%, transparent), transparent 45%),
    var(--paper);
}
html[data-theme] .login-container { background: var(--card); }
html[data-theme]:not([data-theme="classic"]) .btn-submit {
  background: linear-gradient(135deg, var(--blue), var(--grad-2));
}
html[data-theme]:not([data-theme="classic"]) .btn-submit:hover { filter: brightness(1.1); }

/* ---------------------------------------------------------
   Midnight (dark) — fix colours that were hard-coded for light
--------------------------------------------------------- */
html[data-theme="midnight"] .brand-text small,
html[data-theme="midnight"] .signature-title,
html[data-theme="midnight"] .news-excerpt,
html[data-theme="midnight"] .course-desc,
html[data-theme="midnight"] .partner-card p,
html[data-theme="midnight"] .page-intro,
html[data-theme="midnight"] .testimonial-role,
html[data-theme="midnight"] .no-news,
html[data-theme="midnight"] .no-courses,
html[data-theme="midnight"] .no-data { color: var(--muted); }
html[data-theme="midnight"] .director-copy blockquote { color: #cbd5e1; }
html[data-theme="midnight"] .section-head h2,
html[data-theme="midnight"] .director-copy h2,
html[data-theme="midnight"] .contact-list strong,
html[data-theme="midnight"] h2[style*="color: var(--blue)"] { color: #93c5fd !important; }
html[data-theme="midnight"] .brand { color: var(--dark); }
html[data-theme="midnight"] .main-nav a:not(.login-btn) { color: var(--dark); }
html[data-theme="midnight"] .nav-toggle span { background: var(--dark); }
html[data-theme="midnight"] table th { background: #1b2640; color: #93c5fd; }
html[data-theme="midnight"] table th,
html[data-theme="midnight"] table td { border-bottom-color: var(--line); }
html[data-theme="midnight"] table tr:hover { background: #1a2438; }
html[data-theme="midnight"] .testimonial-dot { background: #334155; }
html[data-theme="midnight"] .form-control { background: #0f172a; }
html[data-theme="midnight"] .partner-logo { background: #ffffff; }

@media (max-width: 900px) {
  html[data-theme] .main-nav { background: var(--card); }
  html[data-theme] .main-nav a { border-bottom-color: var(--line); }
}

/* ---------------------------------------------------------
   Theme picker (built by theme.js) + install button (pwa.js)
--------------------------------------------------------- */
.theme-fab {
  position: fixed;
  left: 24px;
  z-index: 1100;
  border: none;
  cursor: pointer;
  color: #fff;
  font: 600 14px/1 'Inter', system-ui, sans-serif;
  box-shadow: 0 8px 24px -6px rgba(0, 0, 0, .35);
  transition: transform .2s ease;
}
.theme-fab {
  bottom: 30px;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: conic-gradient(from 200deg, #ef4444, #f59e0b, #84cc16, #06b6d4, #6366f1, #d946ef, #ef4444);
}
.theme-fab svg { width: 26px; height: 26px; filter: drop-shadow(0 1px 2px rgba(0,0,0,.4)); }
.theme-fab:hover { transform: scale(1.08); }
.theme-fab:focus-visible, .theme-swatch:focus-visible {
  outline: 3px solid var(--gold, #d4af37);
  outline-offset: 3px;
}

.theme-panel {
  position: fixed;
  left: 24px;
  bottom: 96px;
  z-index: 1100;
  width: 260px;
  max-width: calc(100vw - 48px);
  padding: 16px;
  border-radius: 16px;
  background: var(--card, #fff);
  color: var(--dark, #1a202c);
  box-shadow: 0 20px 50px -12px rgba(0, 0, 0, .45);
  font-family: 'Inter', system-ui, sans-serif;
  opacity: 0;
  transform: translateY(10px) scale(.97);
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
}
.theme-panel.is-open { opacity: 1; transform: none; pointer-events: auto; }
.theme-panel h4 { margin: 0 0 12px; font-size: 14px; font-weight: 700; letter-spacing: .3px; }
.theme-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.theme-swatch {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: inherit;
  font: 500 11px/1.2 'Inter', system-ui, sans-serif;
}
.theme-swatch span.dot-preview {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 3px solid transparent;
  box-shadow: 0 2px 6px rgba(0, 0, 0, .2);
  transition: transform .15s ease, border-color .15s ease;
}
.theme-swatch:hover span.dot-preview { transform: scale(1.08); }
.theme-swatch[aria-pressed="true"] span.dot-preview { border-color: var(--dark, #1a202c); }

/* Install-app notification — slides down from the top (pwa.js) */
.install-banner {
  position: fixed;
  top: 12px;
  left: 50%;
  z-index: 2000;
  width: calc(100% - 24px);
  max-width: 560px;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 12px 12px 14px;
  border-radius: 14px;
  background: var(--card, #fff);
  color: var(--dark, #1a202c);
  border-top: 4px solid var(--blue, #2c3e50);
  box-shadow: 0 16px 40px -10px rgba(0, 0, 0, .4);
  font-family: 'Inter', system-ui, sans-serif;
  transform: translate(-50%, calc(-100% - 24px));
  opacity: 0;
  pointer-events: none;
  transition: transform .4s cubic-bezier(.2, .9, .3, 1.2), opacity .3s ease;
}
.install-banner { flex-wrap: wrap; }
.install-banner-steps {
  flex-basis: 100%;
  margin-top: 4px;
  padding: 12px 14px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--blue, #2c3e50) 8%, var(--card, #fff));
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--dark, #1a202c);
}
.install-banner-steps[hidden] { display: none; }
.install-banner-steps small { display: block; color: var(--muted, #555); line-height: 1.6; margin-top: 4px; }
.ib-key {
  display: inline-block;
  min-width: 22px;
  padding: 0 6px;
  border-radius: 6px;
  background: var(--card, #fff);
  border: 1px solid var(--line, #d7dce2);
  text-align: center;
  font-weight: 700;
  line-height: 1.6;
}
.install-banner.is-visible {
  transform: translate(-50%, 0);
  opacity: 1;
  pointer-events: auto;
}
.install-banner-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  flex-shrink: 0;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, .15);
}
.install-banner-text { flex: 1; min-width: 0; line-height: 1.3; }
.install-banner-text strong { display: block; font-size: 15px; }
.install-banner-sub { display: block; font-size: 12.5px; color: var(--muted, #555); margin-top: 2px; }
.install-banner-btn {
  flex-shrink: 0;
  border: none;
  cursor: pointer;
  color: #fff;
  font: 700 14px/1 'Inter', system-ui, sans-serif;
  padding: 11px 18px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--blue, #2c3e50), var(--grad-2, #1e6f9f));
  box-shadow: 0 6px 16px -6px var(--blue, #2c3e50);
}
.install-banner-btn:hover { filter: brightness(1.1); }
.install-banner-close {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--muted, #555);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}
.install-banner-close:hover { background: color-mix(in srgb, var(--dark, #1a202c) 8%, transparent); }
.install-banner-btn:focus-visible,
.install-banner-close:focus-visible {
  outline: 3px solid var(--gold, #d4af37);
  outline-offset: 2px;
}

@media (max-width: 480px) {
  .theme-fab { left: 16px; bottom: 20px; width: 46px; height: 46px; }
  .theme-fab svg { width: 22px; height: 22px; }
  .theme-panel { left: 16px; bottom: 78px; }
  .install-banner { top: 8px; width: calc(100% - 16px); gap: 10px; padding: 10px; }
  .install-banner-icon { width: 38px; height: 38px; }
  .install-banner-text strong { font-size: 14px; }
  .install-banner-sub { font-size: 12px; }
  .install-banner-btn { padding: 10px 14px; font-size: 13px; }
}

/* Installed app (standalone) — respect phone notches */
@media (display-mode: standalone) {
  .utility-bar { padding-top: max(8px, env(safe-area-inset-top)); }
  .theme-fab { bottom: max(20px, calc(env(safe-area-inset-bottom) + 12px)); }
}

@media (prefers-reduced-motion: reduce) {
  html[data-theme] body, .theme-panel, .theme-fab, .install-banner { transition: none; }
}