/* ============================================================
   QuizHive – Main Stylesheet
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --primary:        #6366f1;
  --primary-dark:   #4f46e5;
  --primary-light:  #818cf8;
  --primary-xlight: #e0e7ff;
  --secondary:      #06b6d4;
  --success:        #10b981;
  --warning:        #f59e0b;
  --danger:         #ef4444;
  --dark:           #0f172a;
  --dark-2:         #1e293b;
  --dark-3:         #334155;
  --ink:            #0f172a; /* fixed navy accent — does NOT flip in dark mode (table headers, sticky bar, footer) */
  --gray:           #64748b;
  --gray-light:     #94a3b8;
  --border:         #e2e8f0;
  --bg:             #f8fafc;
  --white:          #ffffff;

  --shadow-sm:  0 1px 3px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);
  --shadow-md:  0 6px 16px rgba(15,23,42,.08), 0 2px 6px rgba(15,23,42,.05);
  --shadow-lg:  0 24px 48px rgba(15,23,42,.12), 0 10px 20px rgba(15,23,42,.06);
  --shadow-xl:  0 40px 80px rgba(15,23,42,.16);
  --shadow-glow: 0 0 0 1px rgba(99,102,241,.06), 0 20px 44px rgba(99,102,241,.14);

  --radius-sm:  8px;
  --radius:     14px;
  --radius-lg:  22px;
  --radius-xl:  32px;

  --transition: all .25s cubic-bezier(.4,0,.2,1);

  --navbar-h: 68px;
}

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background:
    radial-gradient(circle at 1px 1px, rgba(99,102,241,.05) 1px, transparent 0) 0 0/26px 26px,
    var(--bg);
  color: var(--dark);
  line-height: 1.65;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}
img { max-width:100%; display:block; }
a { color: inherit; }

::-webkit-scrollbar { width:6px; height:6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--primary-light); border-radius:3px; }

/* ── Navbar ─────────────────────────────────────────────────── */
.navbar {
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(99,102,241,.1);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--navbar-h);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 1px 24px rgba(0,0,0,.06);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--dark);
  letter-spacing: -.02em;
}

.brand-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 11px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.15rem;
  box-shadow: 0 4px 14px rgba(99,102,241,.35);
  flex-shrink: 0;
}

.navbar-brand span {
  background:linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
}

.navbar-collapse { display: contents; }

.navbar-nav { display:flex; align-items:center; gap:.2rem; list-style:none; }

.navbar-nav a {
  text-decoration: none;
  color: var(--gray);
  font-weight: 500;
  font-size: .875rem;
  padding: .5rem .9rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  display: flex; align-items: center; gap:6px;
}
.navbar-nav a:hover, .navbar-nav a.active {
  color: var(--primary);
  background: var(--primary-xlight);
}

.navbar-actions { display:flex; align-items:center; gap:.75rem; }
.navbar-greeting { font-size:.85rem; font-weight:600; color:var(--gray); white-space:nowrap; }

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap:7px;
  padding: .6rem 1.35rem;
  border-radius: var(--radius-sm);
  font-weight: 600; font-size: .875rem;
  cursor: pointer; text-decoration: none;
  border: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
  letter-spacing: .01em;
  line-height: 1;
}
.btn:focus-visible { outline:3px solid var(--primary-light); outline-offset:2px; }
.btn:disabled { opacity:.55; cursor:not-allowed; transform:none !important; }

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: 0 4px 14px rgba(99,102,241,.35);
}
.btn-primary:hover { transform:translateY(-1px); box-shadow:0 6px 20px rgba(99,102,241,.45); color:white; }

.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover { background:var(--primary); color:white; transform:translateY(-1px); }

.btn-ghost {
  background: rgba(255,255,255,.12);
  color: white;
  border-color: rgba(255,255,255,.25);
}
.btn-ghost:hover { background:rgba(255,255,255,.22); color:white; }

.btn-success {
  background: linear-gradient(135deg, var(--success), #059669);
  color: white; box-shadow:0 4px 14px rgba(16,185,129,.3);
}
.btn-success:hover { transform:translateY(-1px); box-shadow:0 6px 20px rgba(16,185,129,.4); color:white; }

.btn-danger {
  background: linear-gradient(135deg, var(--danger), #dc2626);
  color: white; box-shadow:0 4px 14px rgba(239,68,68,.3);
}
.btn-danger:hover { transform:translateY(-1px); color:white; }

.btn-warning {
  background: linear-gradient(135deg, var(--warning), #d97706);
  color: white;
}
.btn-warning:hover { transform:translateY(-1px); color:white; }

.btn-secondary {
  background: var(--bg); color:var(--dark-3);
  border-color: var(--border);
}
.btn-secondary:hover { background:var(--border); }

.btn-sm  { padding:.38rem .85rem; font-size:.8rem; }
.btn-lg  { padding:.8rem 1.9rem; font-size:1rem; }
.btn-block { width:100%; justify-content:center; }

/* ── Layout helpers ──────────────────────────────────────────── */
.container    { max-width:1200px; margin:0 auto; padding:0 1.5rem; }
.container-sm { max-width:820px;  margin:0 auto; padding:0 1.5rem; }
.container-xs { max-width:480px;  margin:0 auto; padding:0 1.5rem; }
.section      { padding:4.5rem 0; }
.section-sm   { padding:2.5rem 0; }

/* ── Section header ─────────────────────────────────────────── */
.section-header { text-align:center; margin-bottom:2.5rem; }
.section-header h2 {
  font-size:clamp(1.6rem,3vw,2.2rem);
  font-weight:800; letter-spacing:-.03em; margin-bottom:.5rem;
  background:linear-gradient(135deg, var(--dark) 40%, var(--primary-dark) 120%);
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
}
.section-header p { color:var(--gray); font-size:1.05rem; }

/* ── Hero ───────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(140deg, #0b0f1f 0%, #1a1045 55%, #0d1a2e 100%);
  color: white;
  padding: 6rem 2rem 5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* animated blobs */
.hero::before {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(99,102,241,.22) 0%, transparent 70%);
  top: -100px; left: 50%; transform: translateX(-50%);
  animation: heroBlob 10s ease-in-out infinite alternate;
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute; inset:0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none'%3E%3Cg fill='%236366f1' fill-opacity='0.04'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
@keyframes heroBlob { to { transform:translateX(-50%) scale(1.25); } }

.hero-content { position:relative; z-index:1; max-width:720px; margin:0 auto; }

/* ── Floating "QuizHive" word background (behind aurora/content) ─ */
.hero-word-bg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: .55;
}

/* ── Hero: two-column with photo visual ──────────────────────── */
.hero-inner {
  position:relative; z-index:1;
  max-width:1180px; margin:0 auto;
  display:grid; grid-template-columns:1.05fr .95fr; gap:3rem; align-items:center;
  text-align:left;
}
.hero-inner .hero-content { max-width:none; margin:0; text-align:left; }
.hero-inner .hero-actions { justify-content:flex-start; }
.hero-inner .hero-badge { margin-left:0; }
.hero-inner p { margin-left:0; }

.hero-visual { position:relative; }
.hero-visual-frame {
  border-radius:var(--radius-xl);
  overflow:hidden;
  box-shadow:0 30px 70px rgba(0,0,0,.45), 0 0 0 1px rgba(255,255,255,.08);
  aspect-ratio:4/5;
}
.hero-visual-frame img { width:100%; height:100%; object-fit:cover; display:block; }

.hero-float-card {
  position:absolute;
  display:flex; align-items:center; gap:.7rem;
  background:rgba(15,23,42,.72);
  backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px);
  border:1px solid rgba(255,255,255,.14);
  border-radius:var(--radius);
  padding:.7rem 1rem;
  box-shadow:0 16px 32px rgba(0,0,0,.35);
  color:#fff;
}
.hero-float-icon {
  width:36px; height:36px; border-radius:10px; flex-shrink:0;
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  display:flex; align-items:center; justify-content:center;
}
.hero-float-icon-alt { background:linear-gradient(135deg,#f59e0b,#f97316); }
.hero-float-title { font-size:.82rem; font-weight:700; }
.hero-float-sub   { font-size:.72rem; color:rgba(255,255,255,.6); }
.hero-float-score { top:-14px; right:-18px; }
.hero-float-streak { bottom:-16px; left:-22px; }

@media (max-width: 900px) {
  .hero-inner { grid-template-columns:1fr; gap:2.5rem; text-align:center; }
  .hero-inner .hero-content { text-align:center; }
  .hero-inner .hero-actions { justify-content:center; }
  .hero-visual { max-width:360px; margin:0 auto; }
  .hero-float-card { display:none; }
}

/* ── Why split (image + copy) ────────────────────────────────── */
.why-split-grid {
  display:grid; grid-template-columns:1fr 1fr; gap:3.5rem; align-items:center;
}
.why-split-media { position:relative; }
.why-split-media img {
  width:100%; aspect-ratio:5/4; object-fit:cover;
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-xl);
}
.why-split-badge {
  position:absolute; bottom:-16px; left:1.4rem;
  display:inline-flex; align-items:center; gap:6px;
  background:var(--white); color:var(--dark);
  padding:.6rem 1rem; border-radius:50px;
  box-shadow:var(--shadow-lg); border:1px solid var(--border);
  font-size:.8rem; font-weight:700;
}
.why-split-list { list-style:none; padding:0; margin:0 0 1.6rem; display:grid; gap:.7rem; }
.why-split-list li { display:flex; align-items:center; gap:.6rem; font-size:.95rem; color:var(--dark-2); font-weight:500; }
.why-split-list li svg { color:var(--success); flex-shrink:0; }
@media (max-width:860px) {
  .why-split-grid { grid-template-columns:1fr; gap:2.5rem; }
  .why-split-media { order:-1; }
}

/* ── Trust strip ──────────────────────────────────────────────── */
.trust-strip { background:var(--white); border-bottom:1px solid var(--border); padding:1.6rem 0; }
.trust-strip-inner { display:flex; align-items:center; justify-content:center; gap:1rem; flex-wrap:wrap; text-align:center; }
.trust-strip-avatars { display:flex; }
.trust-strip-avatars img {
  width:42px; height:42px; border-radius:50%; object-fit:cover;
  border:3px solid var(--white); margin-left:-12px; box-shadow:var(--shadow-sm);
}
.trust-strip-avatars img:first-child { margin-left:0; }
.trust-strip p { font-size:.92rem; color:var(--gray); margin:0; }
.trust-strip strong { color:var(--dark); }

/* ── Simple page banner (About, Contact, etc.) ───────────────── */
.page-banner {
  background:linear-gradient(140deg,#0b0f1f,#1a1045);
  color:white; padding:3.4rem 0; text-align:center;
}
.page-banner .hero-badge { margin:0 auto 1rem; }
.page-banner h1 { font-size:clamp(1.8rem,3.4vw,2.5rem); font-weight:800; letter-spacing:-.03em; margin-bottom:.6rem; }
.page-banner p { color:rgba(255,255,255,.6); max-width:560px; margin:0 auto; }

/* ── Split banner (quizzes.php, premium.php) ─────────────────── */
.page-banner-split {
  background:linear-gradient(140deg,#0b0f1f,#1a1045); color:white; padding:3rem 0;
}
.page-banner-split-inner {
  display:grid; grid-template-columns:1fr .55fr; gap:2.5rem; align-items:center;
}
.page-banner-split-media { position:relative; }
.page-banner-split-media .media-frame { aspect-ratio:16/10; }
.premium-hero-split { grid-template-columns:1.1fr .9fr; max-width:900px; margin:0 auto; }
@media (max-width:760px) {
  .page-banner-split-inner { grid-template-columns:1fr; }
  .page-banner-split-media { display:none; }
}

/* ── Contact page ─────────────────────────────────────────────── */
.contact-grid { display:grid; grid-template-columns:.85fr 1.15fr; gap:3rem; align-items:start; }
.contact-info-item {
  display:flex; align-items:flex-start; gap:.9rem;
  padding:1rem 0; border-bottom:1px solid var(--border);
}
.contact-info-item:last-child { border-bottom:none; }
.contact-info-icon {
  width:38px; height:38px; border-radius:10px; flex-shrink:0;
  background:rgba(99,102,241,.1); color:var(--primary);
  display:flex; align-items:center; justify-content:center;
}
.contact-info-label { font-size:.72rem; font-weight:700; text-transform:uppercase; letter-spacing:.04em; color:var(--gray); margin-bottom:.15rem; }
.contact-info-item a { font-weight:600; color:var(--dark); }
.contact-info-item a:hover { color:var(--primary); }
.contact-form-card {
  background:var(--white); border:1px solid var(--border); border-radius:var(--radius-lg);
  box-shadow:var(--shadow-md); padding:2rem;
}
@media (max-width:860px) {
  .contact-grid { grid-template-columns:1fr; gap:2rem; }
}

.hero-badge {
  display: inline-flex; align-items:center; gap:7px;
  background: rgba(99,102,241,.18);
  border: 1px solid rgba(99,102,241,.4);
  color: #a5b4fc;
  padding: .35rem 1rem;
  border-radius: 50px;
  font-size: .78rem; font-weight:700;
  margin-bottom: 1.5rem;
  letter-spacing:.04em; text-transform:uppercase;
  backdrop-filter: blur(8px);
}

.hero h1 {
  font-size: clamp(2.4rem,5.5vw,4rem);
  font-weight: 900; line-height: 1.08;
  margin-bottom: 1.2rem;
  letter-spacing: -.03em;
}
.hero h1 .gradient-text {
  background: linear-gradient(135deg, #a5b4fc 0%, #38bdf8 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.1rem; color:rgba(255,255,255,.68);
  margin-bottom: 2.2rem; max-width:540px;
  margin-left:auto; margin-right:auto; line-height:1.7;
}

.hero-actions { display:flex; gap:.9rem; justify-content:center; flex-wrap:wrap; }

.hero-stats {
  display: flex; justify-content:center; gap:3rem; flex-wrap:wrap;
  margin-top:4rem; padding-top:3rem;
  border-top:1px solid rgba(255,255,255,.08);
  position:relative; z-index:1;
}
.hero-stat { text-align:center; }
.hero-stat-number {
  font-size:2.1rem; font-weight:900;
  background:linear-gradient(135deg,#a5b4fc,#38bdf8);
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
}
.hero-stat-label { font-size:.8rem; color:rgba(255,255,255,.45); margin-top:.25rem; font-weight:500; letter-spacing:.03em; }

/* ── Cards ──────────────────────────────────────────────────── */
.card {
  background: linear-gradient(180deg, var(--white) 0%, var(--white) 100%);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: var(--transition);
}
.card:hover { box-shadow:var(--shadow-glow); transform:translateY(-4px); }
.card-body   { padding:1.5rem; }
.card-header { padding:1.1rem 1.5rem; border-bottom:1px solid var(--border); background:var(--bg); }
.card-footer { padding:1.1rem 1.5rem; border-top:1px solid var(--border); background:var(--bg); }

/* ── Quiz grid & cards ──────────────────────────────────────── */
.quiz-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(310px,1fr)); gap:1.4rem; }

.quiz-card {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: var(--transition);
  display: flex; flex-direction:column;
}
.quiz-card:hover { box-shadow:var(--shadow-glow); transform:translateY(-6px); }

.quiz-card-header {
  padding: 1.4rem 1.5rem;
  color: white;
  position: relative; overflow:hidden;
  min-height: 148px;
  display:flex; flex-direction:column; justify-content:flex-end;
  background-size: cover;
  background-position: center;
}
.quiz-card-header::after {
  content:'';
  position:absolute; top:-30%; right:-8%;
  width:130px; height:130px;
  background:rgba(255,255,255,.09);
  border-radius:50%;
  pointer-events:none;
}

.quiz-card-category {
  display:inline-flex; align-items:center; gap:5px;
  background:rgba(255,255,255,.18);
  backdrop-filter:blur(8px);
  padding:.22rem .7rem; border-radius:50px;
  font-size:.72rem; font-weight:700;
  margin-bottom:.75rem; letter-spacing:.03em;
}

.quiz-card-title { font-size:1.1rem; font-weight:700; line-height:1.35; margin-bottom:.4rem; }
.quiz-card-desc  { font-size:.82rem; opacity:.82; line-height:1.55; }

.quiz-card-body { padding:1.4rem 1.5rem; flex:1; display:flex; flex-direction:column; gap:1rem; }

.quiz-card-meta { display:flex; gap:1rem; flex-wrap:wrap; }
.quiz-meta-item {
  display:flex; align-items:center; gap:5px;
  font-size:.8rem; color:var(--gray); font-weight:500;
}

.quiz-card-footer {
  display:flex; align-items:center; justify-content:space-between;
  padding-top:.9rem; border-top:1px solid var(--border); margin-top:auto;
}

/* ── Filter bar ─────────────────────────────────────────────── */
.filter-bar {
  background:var(--white); border-radius:var(--radius);
  padding:1.1rem 1.4rem; box-shadow:var(--shadow-sm);
  border:1px solid var(--border); margin-bottom:2rem;
  display:flex; gap:1rem; align-items:center; flex-wrap:wrap;
}
.filter-bar h4 { font-size:.8rem; font-weight:700; color:var(--gray); white-space:nowrap; letter-spacing:.04em; text-transform:uppercase; }

.filter-tabs { display:flex; gap:.35rem; flex-wrap:wrap; flex:1; }

.filter-tab {
  padding:.35rem .9rem; border-radius:50px;
  font-size:.8rem; font-weight:600; cursor:pointer;
  text-decoration:none; color:var(--gray);
  background:var(--bg); border:1.5px solid var(--border);
  transition:var(--transition);
}
.filter-tab:hover, .filter-tab.active {
  background:var(--primary); color:white; border-color:var(--primary);
  box-shadow:0 4px 12px rgba(99,102,241,.3);
}

.search-box {
  display:flex; align-items:center; gap:.5rem;
  background:var(--bg); border:2px solid var(--border);
  border-radius:var(--radius-sm); padding:.38rem .8rem; min-width:210px;
  transition:var(--transition);
}
.search-box:focus-within { border-color:var(--primary); }
.search-box input {
  border:none; background:none; outline:none;
  font-family:inherit; font-size:.875rem; color:var(--dark); flex:1;
}
.search-box input::placeholder { color:var(--gray-light); }

/* ── Auth pages ─────────────────────────────────────────────── */
.auth-wrapper {
  min-height:calc(100vh - var(--navbar-h));
  display:flex; align-items:center; justify-content:center;
  padding:2rem;
  background: linear-gradient(145deg, #eef2ff 0%, #e0f2fe 100%);
}

.auth-card {
  width:100%; max-width:460px;
  background:var(--white); border-radius:var(--radius-lg);
  box-shadow:var(--shadow-xl); overflow:hidden;
}

.auth-card-header {
  padding:2.5rem 2.5rem 2rem;
  text-align:center;
  background:linear-gradient(135deg, var(--primary), var(--primary-dark));
  color:white;
}
.auth-icon {
  width:64px; height:64px;
  background:rgba(255,255,255,.18);
  backdrop-filter:blur(8px);
  border-radius:50%; display:flex; align-items:center; justify-content:center;
  font-size:1.9rem; margin:0 auto 1rem;
  border:2px solid rgba(255,255,255,.25);
}
.auth-card-header h2 { font-size:1.65rem; font-weight:800; margin-bottom:.3rem; }
.auth-card-header p  { font-size:.88rem; opacity:.82; }

.auth-card-body { padding:2.2rem 2.5rem; }

.auth-footer {
  text-align:center; padding:1.3rem;
  background:var(--bg); border-top:1px solid var(--border);
  font-size:.875rem; color:var(--gray);
}
.auth-footer a { color:var(--primary); font-weight:600; text-decoration:none; }
.auth-footer a:hover { text-decoration:underline; }

/* ── Forms ──────────────────────────────────────────────────── */
.form-group { margin-bottom:1.2rem; }
.form-label {
  display:block; font-weight:600; font-size:.85rem;
  color:var(--dark-2); margin-bottom:.45rem;
}
.form-control, .form-select {
  width:100%; padding:.72rem 1rem;
  border:2px solid var(--border); border-radius:var(--radius-sm);
  font-family:inherit; font-size:.9rem; color:var(--dark);
  background:var(--white); transition:var(--transition); outline:none;
}
.form-control:focus, .form-select:focus {
  border-color:var(--primary);
  box-shadow:0 0 0 4px rgba(99,102,241,.12);
}
.form-control::placeholder { color:var(--gray-light); }
textarea.form-control { resize:vertical; min-height:90px; }
.form-text { font-size:.78rem; color:var(--gray); margin-top:.38rem; }

.form-error {
  background:rgba(239,68,68,.07); border:1.5px solid rgba(239,68,68,.22);
  color:#b91c1c; padding:.75rem 1rem; border-radius:var(--radius-sm);
  font-size:.875rem; margin-bottom:1rem;
  display:flex; align-items:center; gap:8px;
}
.form-success {
  background:rgba(16,185,129,.07); border:1.5px solid rgba(16,185,129,.22);
  color:#065f46; padding:.75rem 1rem; border-radius:var(--radius-sm);
  font-size:.875rem; margin-bottom:1rem;
  display:flex; align-items:center; gap:8px;
}

/* ── Badges ─────────────────────────────────────────────────── */
.badge {
  display:inline-flex; align-items:center; gap:4px;
  padding:.2rem .65rem; border-radius:50px;
  font-size:.72rem; font-weight:700; letter-spacing:.02em;
}
.badge-primary   { background:rgba(99,102,241,.1);  color:var(--primary); }
.badge-success   { background:rgba(16,185,129,.1);  color:var(--success); }
.badge-warning   { background:rgba(245,158,11,.1);  color:var(--warning); }
.badge-danger    { background:rgba(239,68,68,.1);   color:var(--danger); }
.badge-secondary { background:rgba(100,116,139,.1); color:var(--gray); }
.badge-info      { background:rgba(6,182,212,.1);   color:var(--secondary); }

/* ── Alert boxes ────────────────────────────────────────────── */
.alert {
  padding:.9rem 1.1rem; border-radius:var(--radius-sm);
  margin-bottom:1rem; display:flex; align-items:flex-start; gap:9px;
  font-size:.875rem; border:1.5px solid;
}
.alert-info    { background:rgba(6,182,212,.07);  border-color:rgba(6,182,212,.25);  color:#0e7490; }
.alert-success { background:rgba(16,185,129,.07); border-color:rgba(16,185,129,.25); color:#065f46; }
.alert-warning { background:rgba(245,158,11,.07); border-color:rgba(245,158,11,.25); color:#92400e; }
.alert-danger  { background:rgba(239,68,68,.07);  border-color:rgba(239,68,68,.25);  color:#991b1b; }

/* ── Table ──────────────────────────────────────────────────── */
.table-wrapper { overflow-x:auto; border-radius:var(--radius); box-shadow:var(--shadow-sm); }
.table { width:100%; border-collapse:collapse; background:var(--white); font-size:.875rem; }
.table th {
  background:var(--ink); color:white; padding:.9rem 1.1rem;
  text-align:left; font-weight:600; font-size:.75rem;
  letter-spacing:.06em; text-transform:uppercase; white-space:nowrap;
}
.table th:first-child { border-radius:var(--radius) 0 0 0; }
.table th:last-child  { border-radius:0 var(--radius) 0 0; }
.table td {
  padding:.9rem 1.1rem; border-bottom:1px solid var(--border);
  color:var(--dark-2); vertical-align:middle;
}
.table tr:hover td { background:rgba(99,102,241,.025); }
.table tr:last-child td { border-bottom:none; }

/* ── Quiz detail header ─────────────────────────────────────── */
.quiz-detail-header {
  background:linear-gradient(140deg,#0b0f1f,#1a1045);
  color:white; padding:4rem 0; position:relative; overflow:hidden;
}
.quiz-detail-header::before {
  content:''; position:absolute; inset:0;
  background:radial-gradient(ellipse at 60% 0%, rgba(99,102,241,.18) 0%, transparent 65%);
  pointer-events:none;
}

.quiz-detail-meta { display:flex; gap:1.4rem; flex-wrap:wrap; margin-top:1.4rem; }
.quiz-detail-meta-item {
  display:flex; align-items:center; gap:10px;
  font-size:.88rem; color:rgba(255,255,255,.68);
}
.quiz-detail-meta-item .icon {
  width:34px; height:34px;
  background:rgba(255,255,255,.1); border-radius:var(--radius-sm);
  display:flex; align-items:center; justify-content:center; font-size:1rem;
}

/* ── Take quiz ──────────────────────────────────────────────── */
.quiz-sticky-bar {
  background:var(--ink);
  color:white; padding:1rem 0;
  position:sticky; top:0; z-index:100;
  border-bottom:1px solid rgba(255,255,255,.06);
  box-shadow:0 4px 20px rgba(0,0,0,.3);
}

.quiz-timer {
  display:flex; align-items:center; gap:8px;
  background:rgba(239,68,68,.12); color:#fca5a5;
  padding:.45rem .95rem; border-radius:var(--radius-sm);
  font-weight:800; font-size:1rem;
  border:1.5px solid rgba(239,68,68,.25);
  letter-spacing:.02em;
}
.quiz-timer.warning {
  animation:timerPulse 1s ease-in-out infinite;
  color:#ef4444; background:rgba(239,68,68,.18);
}
@keyframes timerPulse { 50% { background:rgba(239,68,68,.28); } }

.question-card {
  background:var(--white); border-radius:var(--radius);
  box-shadow:var(--shadow-md); border:1px solid var(--border);
  overflow:hidden; margin-bottom:1.4rem;
}
.question-number {
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:white; padding:.7rem 1.4rem;
  font-size:.75rem; font-weight:800; letter-spacing:.08em; text-transform:uppercase;
}
.question-text { padding:1.4rem 1.5rem; font-size:1.05rem; font-weight:600; line-height:1.55; }
.options-list  { padding:0 1.5rem 1.5rem; display:grid; gap:.75rem; }

.option-item {
  display:flex; align-items:center; gap:.9rem;
  padding:.9rem 1.1rem;
  border:2px solid var(--border); border-radius:var(--radius-sm);
  cursor:pointer; transition:var(--transition); user-select:none;
}
.option-item:hover { border-color:var(--primary); background:rgba(99,102,241,.04); }
.option-item.selected { border-color:var(--primary); background:rgba(99,102,241,.07); }
.option-item.selected .option-letter { background:var(--primary); color:white; border-color:var(--primary); }
.option-item.correct { border-color:var(--success); background:rgba(16,185,129,.07); }
.option-item.correct .option-letter { background:var(--success); color:white; border-color:var(--success); }
.option-item.wrong   { border-color:var(--danger);  background:rgba(239,68,68,.07); }
.option-item.wrong   .option-letter { background:var(--danger);  color:white; border-color:var(--danger); }

.option-letter {
  width:36px; height:36px; flex-shrink:0;
  border:2px solid var(--border); border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  font-weight:800; font-size:.82rem; color:var(--gray);
  transition:var(--transition);
}
.option-text { font-size:.93rem; flex:1; }
.option-item input[type=radio] { display:none; }

/* ── Result page ────────────────────────────────────────────── */
.result-hero {
  background:linear-gradient(140deg,#0b0f1f,#1a1045);
  color:white; padding:5rem 2rem; text-align:center;
  position:relative; overflow:hidden;
}
.result-hero::before {
  content:''; position:absolute; inset:0;
  background:radial-gradient(ellipse at 50% -10%,rgba(99,102,241,.25) 0%,transparent 65%);
  pointer-events:none;
}

.result-score-circle {
  width:190px; height:190px; margin:0 auto 2rem; position:relative;
}
.result-score-circle svg { width:100%; height:100%; transform:rotate(-90deg); }
.result-score-circle .bg-ring       { fill:none; stroke:rgba(255,255,255,.1); stroke-width:12; }
.result-score-circle .progress-ring {
  fill:none; stroke-width:12; stroke-linecap:round;
  stroke:url(#ringGrad); transition:stroke-dashoffset 1.5s ease;
}
.result-score-text {
  position:absolute; top:50%; left:50%; transform:translate(-50%,-50%);
  text-align:center;
}
.result-score-number { font-size:2.8rem; font-weight:900; line-height:1; }
.result-score-label  { font-size:.78rem; opacity:.6; margin-top:.3rem; font-weight:600; letter-spacing:.04em; text-transform:uppercase; }

.result-grade {
  display:inline-block; padding:.55rem 2rem; border-radius:50px;
  font-size:1rem; font-weight:800; letter-spacing:.05em; margin-bottom:1rem;
}
.grade-excellent { background:linear-gradient(135deg,#10b981,#059669); }
.grade-good      { background:linear-gradient(135deg,#06b6d4,#0891b2); }
.grade-average   { background:linear-gradient(135deg,#f59e0b,#d97706); }
.grade-poor      { background:linear-gradient(135deg,#ef4444,#dc2626); }

.result-stats { display:flex; justify-content:center; gap:1.5rem; flex-wrap:wrap; margin-top:2.5rem; }
.result-stat {
  background:rgba(255,255,255,.08); backdrop-filter:blur(8px);
  border:1px solid rgba(255,255,255,.12);
  padding:1.2rem 2rem; border-radius:var(--radius); text-align:center;
}
.result-stat-number { font-size:1.9rem; font-weight:900; }
.result-stat-label  { font-size:.78rem; opacity:.6; margin-top:.25rem; font-weight:500; }

/* ── Profile ─────────────────────────────────────────────────── */
.profile-header {
  background:linear-gradient(140deg,#0b0f1f,#1a1045);
  color:white; padding:4rem 0;
}
.profile-avatar {
  width:88px; height:88px;
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  border-radius:50%; display:flex; align-items:center; justify-content:center;
  font-size:2.1rem; font-weight:900; color:white;
  border:4px solid rgba(255,255,255,.2); margin-bottom:1rem;
  box-shadow:0 8px 24px rgba(99,102,241,.4);
}

/* ── Empty state ─────────────────────────────────────────────── */
.empty-state { text-align:center; padding:4rem 2rem; color:var(--gray); }
.empty-state-icon {
  width:76px; height:76px;
  background:linear-gradient(135deg,rgba(99,102,241,.1),rgba(6,182,212,.1));
  border-radius:50%; display:flex; align-items:center; justify-content:center;
  font-size:2.2rem; margin:0 auto 1.4rem;
}
.empty-state h3 { font-size:1.25rem; font-weight:700; color:var(--dark-2); margin-bottom:.5rem; }
.empty-state p  { font-size:.9rem; margin-bottom:1.4rem; }

/* ── Modal ───────────────────────────────────────────────────── */
.modal-overlay {
  position:fixed; inset:0; background:rgba(0,0,0,.55);
  backdrop-filter:blur(5px); -webkit-backdrop-filter:blur(5px);
  display:flex; align-items:center; justify-content:center;
  z-index:9999; padding:1rem;
  opacity:0; visibility:hidden; transition:var(--transition);
}
.modal-overlay.active { opacity:1; visibility:visible; }

.modal {
  background:var(--white); border-radius:var(--radius-lg);
  box-shadow:var(--shadow-xl);
  width:100%; max-width:560px;
  transform:translateY(20px) scale(.97); transition:var(--transition);
  overflow:hidden;
}
.modal-overlay.active .modal { transform:translateY(0) scale(1); }

.modal-header {
  padding:1.4rem 1.5rem; border-bottom:1px solid var(--border);
  display:flex; align-items:center; justify-content:space-between;
}
.modal-header h3 { font-size:1.05rem; font-weight:700; }
.modal-close {
  background:none; border:none; font-size:1.4rem; cursor:pointer;
  color:var(--gray); line-height:1; padding:.2rem .4rem;
  border-radius:var(--radius-sm); transition:var(--transition);
}
.modal-close:hover { background:var(--bg); color:var(--dark); }
.modal-body   { padding:1.5rem; max-height:75vh; overflow-y:auto; }
.modal-footer {
  padding:1rem 1.5rem; border-top:1px solid var(--border);
  display:flex; gap:.75rem; justify-content:flex-end; background:var(--bg);
}

/* ── Spinner ─────────────────────────────────────────────────── */
.spinner {
  width:22px; height:22px;
  border:3px solid rgba(99,102,241,.2); border-top-color:var(--primary);
  border-radius:50%; animation:spin .7s linear infinite; display:inline-block;
}
@keyframes spin { to { transform:rotate(360deg); } }

/* ── Footer ──────────────────────────────────────────────────── */
.site-footer {
  background: var(--ink); color: rgba(255,255,255,.55);
  margin-top: auto; font-size: .88rem;
}
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.3fr; gap: 2.2rem;
  padding: 3rem 1.5rem 2.4rem;
}
.footer-brand {
  display: flex; align-items: center; gap: .5rem;
  font-size: 1.15rem; font-weight: 800; color: #fff; margin-bottom: .6rem;
}
.footer-tagline { color: rgba(255,255,255,.45); line-height: 1.6; max-width: 240px; }
.footer-col-title {
  font-size: .74rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em;
  color: rgba(255,255,255,.4); margin-bottom: .9rem;
}
.footer-col { display: flex; flex-direction: column; gap: .65rem; }
.footer-col a {
  color: rgba(255,255,255,.65); text-decoration: none;
  display: flex; align-items: center; gap: .5rem; width: fit-content;
}
.footer-col a:hover { color: #fff; }
.footer-col a svg { flex-shrink: 0; opacity: .7; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); }
.footer-bottom-inner {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap;
  gap: .5rem; padding: 1.2rem 1.5rem; font-size: .78rem; color: rgba(255,255,255,.4);
}
.footer-credit strong { color: rgba(255,255,255,.7); font-weight: 600; }
@media (max-width: 860px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand-col { grid-column: 1 / -1; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom-inner { flex-direction: column; text-align: center; }
}

/* ── Utilities ───────────────────────────────────────────────── */
.text-primary  { color:var(--primary); }
.text-success  { color:var(--success); }
.text-danger   { color:var(--danger);  }
.text-warning  { color:var(--warning); }
.text-gray     { color:var(--gray);    }
.text-center   { text-align:center; }
.text-right    { text-align:right; }
.text-sm       { font-size:.8rem; }
.text-lg       { font-size:1.1rem; }
.fw-bold       { font-weight:700; }
.fw-semibold   { font-weight:600; }
.mt-1 { margin-top:.5rem; }  .mt-2 { margin-top:1rem; }
.mt-3 { margin-top:1.5rem; } .mt-4 { margin-top:2rem; }
.mb-1 { margin-bottom:.5rem; }  .mb-2 { margin-bottom:1rem; }
.mb-3 { margin-bottom:1.5rem; } .mb-4 { margin-bottom:2rem; }
.d-flex      { display:flex; }
.align-center { align-items:center; }
.justify-between { justify-content:space-between; }
.gap-1 { gap:.5rem; } .gap-2 { gap:1rem; }
.flex-wrap { flex-wrap:wrap; }

/* ── Responsive ──────────────────────────────────────────────── */

/* ── Mobile nav toggle ───────────────────────────────────────── */
.navbar-toggle {
  display:none; background:none; border:none; cursor:pointer;
  width:40px; height:40px; align-items:center; justify-content:center;
  border-radius:var(--radius-sm); color:var(--dark); flex-shrink:0;
}
.navbar-toggle:hover { background:var(--bg); }

.navbar-backdrop {
  display:none; position:fixed; inset:0; top:var(--navbar-h);
  background:rgba(15,23,42,.35); z-index:97;
  opacity:0; transition:opacity .25s ease;
}
.navbar-backdrop.is-open { display:block; opacity:1; }

@media (max-width:768px) {
  .navbar { padding:0 1rem; }
  .navbar-brand { min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
  .navbar-toggle { display:flex; }

  .navbar-collapse {
    display:block; /* override the desktop display:contents */
    position:fixed; top:var(--navbar-h); left:0; right:0;
    background:var(--white); border-bottom:1px solid var(--border);
    box-shadow:var(--shadow-md);
    transform:translateY(-8px);
    max-height:0; opacity:0; visibility:hidden; overflow:hidden;
    transition:opacity .2s ease, transform .2s ease, visibility 0s linear .2s;
    z-index:98;
  }
  .navbar-collapse.is-open {
    max-height:calc(100vh - var(--navbar-h));
    opacity:1; visibility:visible; transform:translateY(0);
    overflow-y:auto;
    transition:opacity .2s ease, transform .2s ease;
  }

  .navbar-nav {
    display:flex; flex-direction:column; align-items:stretch; gap:.15rem;
    padding:.75rem .75rem 0;
  }
  .navbar-nav li { width:100%; }
  .navbar-nav a {
    width:100%; padding:.9rem .85rem; border-radius:var(--radius-sm);
    font-size:.95rem;
  }

  .navbar-actions {
    display:flex; flex-direction:column; align-items:stretch; gap:.6rem;
    padding:1rem .75rem 1.25rem; margin-top:.5rem;
    border-top:1px solid var(--border);
  }
  .navbar-actions .theme-toggle { align-self:flex-start; }
  .navbar-actions .badge-premium { align-self:flex-start; }
  .navbar-greeting { padding:.2rem 0; }
  .navbar-actions .btn { width:100%; justify-content:center; padding:.75rem 1rem; }

  body.nav-open { overflow:hidden; }

  .hero { padding:4rem 1.5rem 3rem; }
  .hero-stats { gap:1.5rem; }
  .quiz-grid { grid-template-columns:1fr; }
  .filter-bar { flex-direction:column; align-items:stretch; }
  .auth-card-body { padding:1.5rem; }
  .auth-card-header { padding:2rem 1.5rem 1.5rem; }
  .result-stats { gap:1rem; }
  .result-stat { padding:.9rem 1.2rem; }
}

/* ── Icons (replaces emoji) ──────────────────────────────────── */
.icon-inline { vertical-align:-3px; display:inline-block; flex-shrink:0; }
.icon-lg     { width:32px; height:32px; }

/* ── Premium ─────────────────────────────────────────────────── */
.badge-premium {
  display:inline-flex; align-items:center; gap:4px;
  background:linear-gradient(135deg,#f59e0b,#f97316);
  color:#fff; font-size:.72rem; font-weight:700;
  padding:.3rem .6rem; border-radius:999px; letter-spacing:.02em;
}
.premium-hero {
  background:linear-gradient(135deg,var(--dark),#312e81 60%,#7c3aed);
  color:#fff; border-radius:var(--radius-lg); padding:3rem 2rem; text-align:center;
}
.premium-plan-card {
  background:var(--white); border:2px solid var(--border); border-radius:var(--radius);
  padding:2rem; text-align:center; transition:var(--transition);
}
.premium-plan-card.featured { border-color:var(--warning); box-shadow:var(--shadow-lg); position:relative; }
.premium-plan-card ul { list-style:none; padding:0; margin:1.2rem 0; text-align:left; }
.premium-plan-card li { display:flex; align-items:center; gap:.5rem; padding:.4rem 0; font-size:.92rem; color:var(--dark-2); }
.premium-plan-card li svg { color:var(--success); flex-shrink:0; }

/* ── Avatar / profile picture ───────────────────────────────── */
.avatar-upload-wrap { position:relative; width:104px; height:104px; margin:0 auto; }
.avatar-upload-wrap img,
.avatar-upload-wrap .avatar-fallback {
  width:104px; height:104px; border-radius:50%; object-fit:cover;
  border:3px solid var(--primary-xlight); display:flex; align-items:center; justify-content:center;
  background:var(--primary); color:#fff; font-weight:800; font-size:2.2rem;
}
.avatar-upload-btn {
  position:absolute; bottom:0; right:0; width:32px; height:32px; border-radius:50%;
  background:var(--primary); color:#fff; display:flex; align-items:center; justify-content:center;
  border:2px solid #fff; cursor:pointer; box-shadow:var(--shadow-sm);
}
.password-field { position:relative; }
.password-field .form-control { padding-right:2.75rem; }
.password-toggle {
  position:absolute; top:50%; right:.6rem; transform:translateY(-50%);
  background:none; border:none; cursor:pointer; padding:.3rem;
  display:flex; align-items:center; justify-content:center;
  color:var(--gray); border-radius:6px;
}
.password-toggle:hover { color:var(--dark); background:var(--bg); }

/* ── Animations ──────────────────────────────────────────────── */
html { scroll-behavior: smooth; }

@keyframes fadeInUp {
  from { opacity:0; transform:translateY(16px); }
  to   { opacity:1; transform:translateY(0); }
}
@keyframes fadeIn {
  from { opacity:0; }
  to   { opacity:1; }
}
@keyframes popIn {
  from { opacity:0; transform:scale(.94); }
  to   { opacity:1; transform:scale(1); }
}
@keyframes slideInRight {
  from { opacity:0; transform:translateX(24px); }
  to   { opacity:1; transform:translateX(0); }
}

.card, .quiz-card, .premium-plan-card, .auth-card, .animate-in {
  animation: fadeInUp .5s cubic-bezier(.16,1,.3,1) both;
}
.hero, .premium-hero, .quiz-detail-header, .result-hero {
  animation: fadeIn .6s ease both;
}
.hero-badge { animation: popIn .5s cubic-bezier(.34,1.56,.64,1) both; }

/* Stagger quiz/category grids so cards cascade in rather than popping together */
.quiz-grid > *:nth-child(1), .category-grid > *:nth-child(1) { animation-delay: .03s; }
.quiz-grid > *:nth-child(2), .category-grid > *:nth-child(2) { animation-delay: .08s; }
.quiz-grid > *:nth-child(3), .category-grid > *:nth-child(3) { animation-delay: .13s; }
.quiz-grid > *:nth-child(4), .category-grid > *:nth-child(4) { animation-delay: .18s; }
.quiz-grid > *:nth-child(5), .category-grid > *:nth-child(5) { animation-delay: .23s; }
.quiz-grid > *:nth-child(6), .category-grid > *:nth-child(6) { animation-delay: .28s; }
.quiz-grid > *:nth-child(n+7), .category-grid > *:nth-child(n+7) { animation-delay: .32s; }

.btn:active { transform: scale(.96); }
.btn { will-change: transform; }

.alert, .form-error { animation: slideInRight .35s ease both; }

.modal { animation: popIn .25s cubic-bezier(.34,1.56,.64,1) both; }

/* Respect users who've asked their OS to reduce motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ── Accessibility ───────────────────────────────────────────── */
.skip-link {
  position:absolute; left:-9999px; top:0; z-index:1000;
  background:var(--primary); color:#fff; padding:.7rem 1.2rem;
  border-radius:0 0 8px 0; font-weight:700; font-size:.85rem; text-decoration:none;
}
.skip-link:focus { left:0; }

a:focus-visible, button:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--primary); outline-offset: 2px;
}

.sr-only {
  position:absolute; width:1px; height:1px; padding:0; margin:-1px;
  overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0;
}

/* ── Dark mode ───────────────────────────────────────────────── */
html[data-theme="dark"] {
  --primary-xlight: rgba(99,102,241,.18);
  --dark:           #f1f5f9;
  --dark-2:         #e2e8f0;
  --dark-3:         #cbd5e1;
  --gray:           #94a3b8;
  --gray-light:     #64748b;
  --border:         #334155;
  --bg:             #0b1120;
  --white:          #1e293b;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.35), 0 1px 2px rgba(0,0,0,.25);
  --shadow-md:  0 4px 12px rgba(0,0,0,.4), 0 2px 4px rgba(0,0,0,.25);
  --shadow-lg:  0 20px 40px rgba(0,0,0,.5), 0 8px 16px rgba(0,0,0,.3);
  --shadow-xl:  0 32px 64px rgba(0,0,0,.55);
}
html[data-theme="dark"] body { background:var(--bg); color:var(--dark); }
html[data-theme="dark"] .navbar,
html[data-theme="dark"] footer { background:var(--white); border-color:var(--border); }
html[data-theme="dark"] .navbar-nav { background:var(--white); }
html[data-theme="dark"] input, html[data-theme="dark"] select, html[data-theme="dark"] textarea {
  background:var(--white); color:var(--dark); border-color:var(--border);
}
html[data-theme="dark"] .quiz-detail-header,
html[data-theme="dark"] .premium-hero,
html[data-theme="dark"] .hero { filter:brightness(.92); }

.theme-toggle {
  background:none; border:1px solid var(--border); cursor:pointer;
  width:36px; height:36px; border-radius:50%; display:flex; align-items:center; justify-content:center;
  color:var(--gray); transition:var(--transition);
}
.theme-toggle:hover { background:var(--bg); color:var(--dark); }