/* ══════════════════════════════════════════════════
   IT Study Hub — global.css  (v2 — Tiered Edition)
   FREE  → lime on obsidian  (unchanged)
   PREMIUM / ELITE → molten gold on deep obsidian
   ADMIN → sovereign crimson + platinum crown
══════════════════════════════════════════════════ */

/* ── GOOGLE FONTS (add Cinzel for admin crown) ── */
@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@700;900&display=swap');

/* ════════════════════════════════
   BASE TOKENS  (free / default)
════════════════════════════════ */
:root {
  --bg:            #04040a;
  --surface:       #0a0a14;
  --surface2:      #111120;
  --surface3:      #161625;
  --border:        rgba(255,255,255,0.07);
  --border2:       rgba(255,255,255,0.12);
  --border-active: rgba(200,241,53,0.4);
  --accent:        #c8f135;
  --accent-dim:    rgba(200,241,53,0.12);
  --accent-glow:   rgba(200,241,53,0.25);
  --lime:          #c8f135;
  --lime-dim:      rgba(200,241,53,0.12);
  --lime-glow:     rgba(200,241,53,0.25);
  --text:          #eeeef5;
  --muted:         #6b6b80;
  --muted2:        #9494a8;
  --gold:          #f7b731;
  --gold-dim:      rgba(247,183,49,0.12);
  --green:         #43e97b;
  --red:           #ff5f56;
  --blue:          #60a5fa;
  --ff-display:    'Syne', sans-serif;
  --ff-body:       'DM Sans', sans-serif;
  --ff-mono:       'JetBrains Mono', monospace;
  --ff-crown:      'Cinzel', serif;

  /* tier shimmer defaults (overridden per-tier below) */
  --tier-line:     var(--accent);
  --tier-glow:     var(--accent-glow);
}

/* ════════════════════════════════
   PREMIUM TIER  (body.tier-premium)
   Molten gold on deep obsidian
════════════════════════════════ */
body.tier-premium {
  --accent:        #f7c948;
  --accent-dim:    rgba(247,201,72,0.13);
  --accent-glow:   rgba(247,201,72,0.28);
  --border-active: rgba(247,201,72,0.45);
  --tier-line:     #f7c948;
  --tier-glow:     rgba(247,201,72,0.3);

  /* slightly warmer bg */
  --bg:            #060509;
  --surface:       #0c0b10;
  --surface2:      #131118;
  --surface3:      #18161f;
}

/* ════════════════════════════════
   ELITE TIER  (body.tier-elite)
   Spectral violet-gold
════════════════════════════════ */
body.tier-elite {
  --accent:        #e8b4ff;
  --accent-dim:    rgba(232,180,255,0.12);
  --accent-glow:   rgba(232,180,255,0.26);
  --border-active: rgba(232,180,255,0.4);
  --tier-line:     #e8b4ff;
  --tier-glow:     rgba(232,180,255,0.28);

  --bg:            #050409;
  --surface:       #0b0a12;
  --surface2:      #12101a;
  --surface3:      #17151f;
}

/* ════════════════════════════════
   ADMIN TIER  (body.tier-admin)
   Sovereign crimson + platinum
════════════════════════════════ */
body.tier-admin {
  --accent:        #ff4c6a;
  --accent-dim:    rgba(255,76,106,0.12);
  --accent-glow:   rgba(255,76,106,0.28);
  --border-active: rgba(255,76,106,0.45);
  --tier-line:     #ff4c6a;
  --tier-glow:     rgba(255,76,106,0.32);

  --bg:            #060307;
  --surface:       #0d0a0e;
  --surface2:      #130f14;
  --surface3:      #19141a;
}

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

/* Custom cursor only on pointer (non-touch) devices */
@media (pointer: fine) {
  *, *::before, *::after { cursor: none !important; }
}

/* Keyboard focus — visible outline for all interactive elements */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

/* Respect reduced-motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--ff-body);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background 0.6s ease, color 0.3s ease;
}

/* ── NOISE OVERLAY ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

/* ════════════════════════════════
   TIER AURA  — ambient glow behind
   the whole page per tier
════════════════════════════════ */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 50% 0%, var(--tier-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  opacity: 0;
  transition: opacity 0.8s ease;
}

body.tier-premium::after,
body.tier-elite::after,
body.tier-admin::after {
  opacity: 1;
}

/* ── AMBIENT BLOBS ── */
.ambient {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
}

/* ── CUSTOM CURSOR ── */
#cur {
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  mix-blend-mode: difference;
  transition: transform 0.15s ease, background 0.4s ease;
}

#curR {
  width: 36px;
  height: 36px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  position: fixed;
  pointer-events: none;
  z-index: 9998;
  opacity: 0.5;
  transition: all 0.2s ease, border-color 0.4s ease;
}

.cursor {
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  transition: transform 0.15s ease;
  mix-blend-mode: difference;
}

.cursor-ring {
  width: 36px;
  height: 36px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  position: fixed;
  pointer-events: none;
  z-index: 9998;
  transition: all 0.2s ease;
  mix-blend-mode: difference;
  opacity: 0.5;
}

/* ════════════════════════════════
   NAV  — standard sticky
   Extra: tier-coloured top bar
════════════════════════════════ */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0 48px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(4,4,10,0.88);
  backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
}

/* Accent top line that takes the tier colour */
nav::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--tier-line), transparent);
  opacity: 0;
  transition: opacity 0.6s ease;
}

body.tier-premium nav::after,
body.tier-elite   nav::after,
body.tier-admin   nav::after {
  opacity: 1;
}

.nav-logo {
  font-family: var(--ff-display);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--text);
  text-decoration: none;
}

.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-link {
  font-family: var(--ff-mono);
  font-size: 11px;
  color: var(--muted2);
  text-decoration: none;
  transition: color 0.2s;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-link:hover      { color: var(--accent); }
.nav-link.active     { color: var(--accent); }

/* Active nav item — set by JS on current page */
.nav-links a.nav-active {
  color: var(--accent);
  font-weight: 600;
}
/* Mobile tap targets — at least 44px tall */
.nav-links a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-back {
  font-family: var(--ff-mono);
  font-size: 11px;
  color: var(--muted2);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: color 0.2s;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-back:hover { color: var(--accent); }

/* ── NAV TIER PILL (shows beside user name) ── */
.nav-tier-pill {
  display: none;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 100px;
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  font-weight: 600;
  border: 1px solid var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
  animation: pillfade 0.5s ease forwards;
}

@keyframes pillfade {
  from { opacity:0; transform:translateY(-4px); }
  to   { opacity:1; transform:translateY(0); }
}

body.tier-premium .nav-tier-pill,
body.tier-elite   .nav-tier-pill,
body.tier-admin   .nav-tier-pill {
  display: flex;
}

/* Read-progress bar */
.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--accent);
  z-index: 9999;
  transition: width 0.1s linear;
  width: 0%;
}

/* ── LAYOUT SHELL ── */
.layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 300px 1fr;
  min-height: calc(100vh - 64px);
}

/* ════════════════════════════════
   SIDEBAR
════════════════════════════════ */
.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 32px 24px;
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background 0.4s ease, border-color 0.4s ease;
}

/* Premium/Elite sidebar gets a faint left accent stripe */
body.tier-premium .sidebar,
body.tier-elite   .sidebar,
body.tier-admin   .sidebar {
  border-right-color: color-mix(in srgb, var(--accent) 22%, transparent);
}

.sidebar-label {
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 8px;
  display: block;
  padding: 0 4px;
}

/* ── SECTION LABEL ── */
.section-label {
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--muted);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ════════════════════════════════
   PROFILE BOX  — tier upgrades
════════════════════════════════ */

/* Premium glow on avatar */
body.tier-premium .profile-avatar,
body.tier-elite   .profile-avatar {
  box-shadow: 0 0 0 2px var(--accent), 0 0 18px var(--accent-glow);
}

body.tier-admin .profile-avatar {
  box-shadow: 0 0 0 2px var(--accent), 0 0 24px var(--accent-glow);
}

/* ── SVG BADGE WRAPPERS ── */

.badge-premium,
.badge-elite {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: 10px;
}

.badge-premium {
  background: rgba(247,201,72,0.07);
  border: 1px solid rgba(247,201,72,0.35);
}

.badge-elite {
  background: rgba(232,180,255,0.07);
  border: 1px solid rgba(232,180,255,0.35);
}

.badge-label-text {
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1.4;
}

.badge-premium .badge-label-text { color: #f7c948; }
.badge-elite   .badge-label-text { color: #e8b4ff; }

.badge-icon { flex-shrink: 0; width: 28px; height: 28px; }

/* ════════════════════════════════
   ADMIN BADGE  — SVG crown treatment
════════════════════════════════ */
.admin-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  padding: 10px 14px;
  background: rgba(255,76,106,0.08);
  border: 1px solid rgba(255,76,106,0.45);
  border-radius: 10px;
  position: relative;
  overflow: hidden;
}

.admin-badge .badge-label-text {
  font-family: var(--ff-crown);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: #ff4c6a;
  text-transform: uppercase;
}

/* sheen sweep */
.admin-badge::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.06), transparent);
  animation: sheen 3s ease infinite;
}

@keyframes sheen {
  0%   { left: -100%; }
  40%  { left: 150%; }
  100% { left: 150%; }
}

/* ════════════════════════════════
   WELCOME HERO — tier theming
════════════════════════════════ */

/* Premium welcome bar */
body.tier-premium .welcome-hero,
body.tier-elite   .welcome-hero {
  border-bottom-color: color-mix(in srgb, var(--accent) 20%, transparent);
}

body.tier-admin .welcome-hero {
  border-bottom-color: color-mix(in srgb, var(--accent) 28%, transparent);
}

/* Admin welcome gets a discreet crown label above the title */
body.tier-admin .welcome-eyebrow::before {
  content: '👑  ADMIN COMMAND CENTER  ';
  font-family: var(--ff-crown);
  font-size: 9px;
  letter-spacing: 0.22em;
  color: var(--accent);
  display: block;
  margin-bottom: 4px;
}

/* rank chips — accent border on premium+ */
body.tier-premium .rank-chip,
body.tier-elite   .rank-chip,
body.tier-admin   .rank-chip {
  border-color: color-mix(in srgb, var(--accent) 30%, transparent);
  background: var(--accent-dim);
}

/* ════════════════════════════════
   CARD SURFACES — premium glow border
════════════════════════════════ */

/* Any card/section inside premium+ gets a subtle accent border on hover */
body.tier-premium main section,
body.tier-elite   main section,
body.tier-admin   main section {
  transition: box-shadow 0.3s ease;
}

body.tier-premium main section:hover,
body.tier-elite   main section:hover,
body.tier-admin   main section:hover {
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 20%, transparent),
              0 8px 32px -8px var(--accent-glow);
}

/* ════════════════════════════════
   LEADERBOARD — premium rows
════════════════════════════════ */

/* Top-3 medals keep default colour; is-me row takes tier accent */
body.tier-premium .lb-row.is-me,
body.tier-elite   .lb-row.is-me,
body.tier-admin   .lb-row.is-me {
  border-left-color: var(--accent);
  background: var(--accent-dim);
}

/* ════════════════════════════════
   SCORE BARS — accent fill for
   premium tiers
════════════════════════════════ */

/* The fill colour is set inline per subject, but override the track glow */
body.tier-premium .score-bar-track,
body.tier-elite   .score-bar-track,
body.tier-admin   .score-bar-track {
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 12%, transparent);
}

/* ════════════════════════════════
   SKILL BARS — accent on premium
════════════════════════════════ */
body.tier-premium .skill-fill,
body.tier-elite   .skill-fill {
  background: linear-gradient(90deg, var(--accent) 0%, color-mix(in srgb, var(--accent) 60%, #fff) 100%);
  box-shadow: 0 0 10px var(--accent-glow);
}

body.tier-admin .skill-fill {
  background: linear-gradient(90deg, #ff4c6a 0%, #ff9fb0 100%);
  box-shadow: 0 0 10px rgba(255,76,106,0.35);
}

/* ════════════════════════════════
   EXCLUSIVE PREMIUM PANEL
   (injected by JS — .premium-panel)
════════════════════════════════ */
.premium-panel {
  grid-column: 1 / -1;
  background: linear-gradient(135deg,
    var(--surface2) 0%,
    color-mix(in srgb, var(--accent) 6%, var(--surface2)) 100%
  );
  border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
  border-radius: 16px;
  padding: 28px 32px;
  display: flex;
  align-items: center;
  gap: 24px;
  position: relative;
  overflow: hidden;
  animation: fadeUp 0.5s ease 0.05s both;
}

.premium-panel::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% -20%, var(--tier-glow), transparent 70%);
  pointer-events: none;
}

.pp-icon {
  font-size: 36px;
  flex-shrink: 0;
  filter: drop-shadow(0 0 12px var(--accent-glow));
}

.pp-body { flex: 1; }

.pp-label {
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.pp-title {
  font-family: var(--ff-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 6px;
}

.pp-desc {
  font-size: 13px;
  color: var(--muted2);
  line-height: 1.6;
}

.pp-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex-shrink: 0;
}

.pp-btn {
  display: inline-block;
  padding: 10px 22px;
  font-family: var(--ff-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.2s ease;
  white-space: nowrap;
  border: none;
}

.pp-btn-primary {
  background: var(--accent);
  color: #000;
}

.pp-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

.pp-btn-ghost {
  background: transparent;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
}

.pp-btn-ghost:hover {
  background: var(--accent-dim);
}

/* ════════════════════════════════
   ADMIN COMMAND STRIP
   (shown only for tier-admin)
════════════════════════════════ */
.admin-strip {
  display: none;
}

body.tier-admin .admin-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  grid-column: 1 / -1;
  animation: fadeUp 0.5s ease 0.1s both;
}

.admin-tile {
  background: linear-gradient(135deg, var(--surface2), var(--surface3));
  border: 1px solid color-mix(in srgb, #ff4c6a 22%, transparent);
  border-radius: 12px;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.admin-tile:hover {
  border-color: rgba(255,76,106,0.5);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255,76,106,0.15);
}

.admin-tile-icon { font-size: 22px; }

.admin-tile-label {
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: rgba(255,76,106,0.8);
  text-transform: uppercase;
}

.admin-tile-title {
  font-family: var(--ff-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}

/* ════════════════════════════════
   ANIMATIONS
════════════════════════════════ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0);    }
}

.fade-up {
  opacity: 0;
  animation: fadeUp 0.6s ease forwards;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1);    }
  50%       { opacity: 0.5; transform: scale(0.8); }
}

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

/* ── SPINNER ── */
.spinner {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}

/* ── TOAST ── */
.toast {
  position: fixed;
  bottom: 28px;
  right: 28px;
  background: var(--surface);
  border: 1px solid var(--border-active);
  border-radius: 12px;
  padding: 14px 20px;
  font-family: var(--ff-mono);
  font-size: 12px;
  color: var(--accent);
  z-index: 9997;
  transform: translateY(80px);
  opacity: 0;
  transition: all 0.35s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* ── UTILITY BUTTONS ── */
.btn-lime {
  display: inline-block;
  background: var(--accent);
  color: #000;
  font-family: var(--ff-mono);
  font-size: 12px;
  font-weight: 700;
  padding: 13px 28px;
  border-radius: 6px;
  text-decoration: none;
  letter-spacing: 1px;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-lime:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-ghost {
  display: inline-block;
  background: transparent;
  color: var(--text);
  font-family: var(--ff-mono);
  font-size: 12px;
  font-weight: 600;
  padding: 13px 28px;
  border-radius: 6px;
  text-decoration: none;
  letter-spacing: 1px;
  border: 1px solid var(--border2);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-gold {
  display: inline-block;
  background: var(--gold);
  color: #000;
  font-family: var(--ff-mono);
  font-size: 12px;
  font-weight: 700;
  padding: 13px 28px;
  border-radius: 6px;
  text-decoration: none;
  letter-spacing: 1px;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--gold-dim);
}

/* Hide custom cursor on touch devices */
@media (pointer: coarse) {
  .cursor, .cursor-ring, #cur, #curR { display: none !important; }
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  nav { padding: 0 20px; }
  .layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .premium-panel { flex-direction: column; }
  .pp-actions { flex-direction: row; }
}