@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@500;600;700;800&family=Plus+Jakarta+Sans:wght@600;700;800&family=Source+Sans+3:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Academic identity — deep institutional blue, teal, amber. No purple. */
  --primary:      #0F4C81;
  --primary-light:#1F6DAE;
  --primary-dark: #0A3660;
  --secondary:    #14B8A6;
  --secondary-dark:#0E9285;
  --accent:       #F59E0B;
  --accent-dark:  #C9800A;
  --white:        #ffffff;
  --bg:           #F7FAFC;
  --bg2:          #EEF2F6;
  --card:         #FFFFFF;
  --text:         #1B2733;
  --text-2:       #4B5A6B;
  --gray:         #6E7C8C;
  --border:       #E2E8F0;
  --border2:      #E2E8F0;
  --success:      #16A34A;
  --danger:       #DC2626;
  --shadow:       0 6px 20px rgba(15,76,129,0.08);
  --shadow-lg:    0 16px 44px rgba(15,76,129,0.14);
  --radius:       16px;
  --radius-lg:    20px;
  --radius-btn:   13px;
}

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { overflow-x:hidden; -webkit-text-size-adjust:100%; scroll-behavior:smooth; font-size:19px; }
img, video, iframe { max-width:100%; }
body {
  font-family:'Source Sans 3', 'IBM Plex Sans', sans-serif;
  font-size:1rem;
  line-height:1.65;
  background:var(--bg); color:var(--text);
  min-height:100vh; display:flex; flex-direction:column; overflow-x:hidden;
}
h1, h2, h3, h4, .heading-font { font-family:'Manrope', 'Plus Jakarta Sans', sans-serif; }
code, pre, .mono { font-family:'JetBrains Mono', monospace; }

/* ===== HEADER — university-style, sticky, logo left / centered menu / login right ===== */
header {
  background:rgba(255,255,255,0.98);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
  padding:0 2rem;
  padding-top:env(safe-area-inset-top);
  position:sticky; top:0; z-index:100;
  box-shadow:0 2px 16px rgba(15,76,129,0.05);
  overflow:visible;
}
.header-inner {
  max-width:1440px; margin:0 auto;
  display:grid; grid-template-columns:auto 1fr auto;
  align-items:center; height:128px; gap:1rem;
}
.logo { display:flex; align-items:center; gap:10px; text-decoration:none; flex-shrink:0; }
.logo img { height:104px; width:auto; object-fit:contain; }
.logo-badge {
  width:44px; height:44px; border-radius:12px; flex-shrink:0;
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  color:white; display:flex; align-items:center; justify-content:center;
  font-family:'Manrope', sans-serif; font-weight:800; font-size:1.05rem;
}
/* Wordmark: the full platform name, with the letters spelling "IDWPL"
   bolded and coloured — so the acronym reads out of the name itself
   instead of needing a separate redundant "IDWPL" label. */
.logo-name {
  font-family:'Manrope', sans-serif; font-size:1.12rem; font-weight:600;
  color:var(--text-2); line-height:1.35; max-width:300px;
}
.logo-name .cap { font-weight:800; font-size:1.08em; }
.logo-name .cap.c1 { color:var(--primary); }
.logo-name .cap.c2 { color:var(--secondary); }
@media (max-width:900px) { .logo-name { display:none; } }

.header-nav {
  display:flex; gap:0.15rem; align-items:center; justify-content:center;
  flex-wrap:nowrap; overflow:visible;
}
.header-nav > a,
.header-nav > .dropdown > a,
.header-nav > .dropdown > button {
  color:var(--text); text-decoration:none; background:none; border:none;
  font-size:1.08rem; font-weight:600; letter-spacing:0.01em;
  padding:0.6rem 1rem; border-radius:10px;
  transition:color 0.18s, background 0.18s;
  cursor:pointer; white-space:nowrap;
  display:inline-flex; align-items:center; gap:7px;
  flex-shrink:0; font-family:'Source Sans 3', sans-serif;
}
.header-nav > a:hover,
.header-nav > .dropdown > a:hover,
.header-nav > .dropdown > button:hover {
  color:var(--primary); background:rgba(15,76,129,0.06);
}
.header-nav > a.active,
.header-nav > .dropdown > a.active {
  color:var(--primary); font-weight:700;
  background:linear-gradient(135deg,rgba(15,76,129,0.08),rgba(20,184,166,0.08));
  box-shadow:inset 0 0 0 1.5px rgba(15,76,129,0.18);
}
.header-nav .ph, .header-nav i[class^="ph"] { font-size:1.2rem; }

/* Hamburger */
.hamburger {
  display:none; flex-direction:column; gap:5px; cursor:pointer;
  padding:10px; border-radius:10px; transition:background 0.18s;
  min-width:44px; min-height:44px; align-items:center; justify-content:center;
  -webkit-tap-highlight-color:transparent; flex-shrink:0;
}
.hamburger:hover { background:rgba(15,76,129,0.08); }
.hamburger span { display:block; width:22px; height:2.5px; background:var(--primary); border-radius:2px; transition:all 0.3s; }

/* Mobile menu */
.mobile-menu {
  display:none; flex-direction:column;
  background:var(--white); border-top:1px solid var(--border);
  padding:1rem 1.25rem 1.25rem;
  box-shadow:0 8px 24px rgba(15,76,129,0.1);
  max-height:0; overflow:hidden; transition:max-height 0.35s ease;
}
.mobile-menu.open { display:flex; max-height:100vh; }
.mobile-menu > a {
  padding:0.85rem 1rem; border-radius:10px; font-weight:600;
  color:var(--text); text-decoration:none; font-size:1.02rem;
  display:flex; align-items:center; gap:0.65rem;
  transition:background 0.15s, color 0.15s;
}
.mobile-menu > a:hover, .mobile-menu > a.active { background:rgba(15,76,129,0.07); color:var(--primary); }
.mobile-section-label {
  font-size:0.78rem; font-weight:700; color:var(--gray); letter-spacing:0.08em;
  text-transform:uppercase; padding:0.85rem 1rem 0.3rem;
}

/* Login button */
.btn-login {
  background:linear-gradient(135deg,var(--primary),var(--primary-light)) !important;
  color:var(--white) !important; padding:12px 24px !important;
  border-radius:var(--radius-btn); font-size:1.02rem !important; font-weight:700 !important;
  box-shadow:0 4px 14px rgba(15,76,129,0.28); white-space:nowrap; flex-shrink:0;
  transition:transform 0.18s, box-shadow 0.18s;
}
.btn-login:hover { transform:translateY(-1px); box-shadow:0 8px 20px rgba(15,76,129,0.34) !important; }

/* Nav user block */
.nav-user {
  display:flex; align-items:center; gap:0.55rem; flex-shrink:0;
  padding:0.35rem 0.6rem;
  background:linear-gradient(135deg,rgba(15,76,129,0.05),rgba(20,184,166,0.07));
  border:1.5px solid rgba(20,184,166,0.25); border-radius:var(--radius-btn);
  max-width:400px;
}
.nav-user-avatar {
  width:36px; height:36px; border-radius:50%; flex-shrink:0;
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  color:white; font-size:0.88rem; font-weight:800;
  display:flex; align-items:center; justify-content:center;
  font-family:'Manrope', sans-serif;
}
.nav-user-info { min-width:0; }
.nav-user-name {
  font-size:0.88rem; font-weight:700; color:var(--primary);
  white-space:nowrap; max-width:230px; overflow:hidden; text-overflow:ellipsis; line-height:1.25;
}
.nav-user-group { font-size:0.8rem; color:var(--secondary-dark); font-weight:600; margin-top:1px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; max-width:230px; }
.btn-nav-logout {
  background:var(--white); border:1.5px solid var(--border);
  color:var(--primary); padding:0.35rem 0.75rem; border-radius:9px;
  font-size:0.85rem; font-weight:600; cursor:pointer;
  font-family:'Source Sans 3', sans-serif; transition:all 0.18s; white-space:nowrap; flex-shrink:0;
}
.btn-nav-logout:hover { background:var(--danger); border-color:var(--danger); color:white; }

/* Dropdown */
.dropdown { position:relative; }
.dropdown-menu {
  display:none; position:absolute; top:calc(100% + 10px); left:50%; transform:translateX(-50%);
  background:var(--white); border-radius:var(--radius-lg);
  box-shadow:var(--shadow-lg);
  border:1px solid var(--border); min-width:260px; z-index:9999;
  overflow:hidden; animation:dropIn 0.15s ease;
}
@keyframes dropIn { from{opacity:0;transform:translateX(-50%) translateY(-6px)} to{opacity:1;transform:translateX(-50%) translateY(0)} }
.dropdown-menu.open { display:block; }
.dropdown-menu a {
  display:flex; align-items:center; gap:0.75rem;
  padding:0.9rem 1.2rem; color:var(--text); text-decoration:none;
  font-size:1rem; font-weight:600;
  border-bottom:1px solid var(--bg2); transition:background 0.15s;
}
.dropdown-menu a:last-child { border-bottom:none; }
.dropdown-menu a:hover { background:rgba(20,184,166,0.08); color:var(--secondary-dark); }
.dropdown-menu a.active { background:rgba(15,76,129,0.08); font-weight:700; }
.dropdown-menu .ph { font-size:1.15rem; color:var(--primary); }
.dropdown:hover > .dropdown-menu { display:block; }

/* ===== PAGE HEADER ===== */
.page-header {
  background:linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 55%, var(--secondary-dark) 100%);
  color:white; padding:3rem 2rem 2.5rem; text-align:center; position:relative; overflow:hidden;
}
.page-header::before {
  content:''; position:absolute; inset:0;
  background:radial-gradient(ellipse at 70% 50%, rgba(20,184,166,0.22) 0%, transparent 60%);
}
.page-header h1 { font-size:clamp(1.7rem,4vw,2.5rem); font-weight:800; position:relative; color:white; display:flex; align-items:center; justify-content:center; gap:0.65rem; }
.page-header p { color:rgba(255,255,255,0.85); font-size:1.05rem; margin-top:0.5rem; position:relative; }

/* ===== MAIN ===== */
.main { flex:1; padding:2rem max(1.5rem, env(safe-area-inset-left)); max-width:1320px; margin:0 auto; width:100%; }

/* ===== SECTIONS ===== */
section { padding:5rem 2rem; }
.section-inner { max-width:1200px; margin:0 auto; }
.section-header { text-align:center; margin-bottom:3rem; }
.section-tag {
  display:inline-flex; align-items:center; gap:6px;
  background:rgba(20,184,166,0.1);
  color:var(--secondary-dark); font-size:0.82rem; font-weight:700;
  padding:0.4rem 1.1rem; border-radius:20px; letter-spacing:0.07em;
  text-transform:uppercase; margin-bottom:0.75rem;
  border:1px solid rgba(20,184,166,0.25);
}
.section-title { font-family:'Manrope',sans-serif; font-size:clamp(1.8rem,4vw,2.6rem); font-weight:800; color:var(--primary); margin-bottom:0.75rem; }
.section-desc { color:var(--text-2); font-size:1.02rem; max-width:600px; margin:0 auto; line-height:1.7; }

/* ===== BUTTONS — rounded 12-14px, soft shadow, academic (not AI-chat) look ===== */
.btn-primary {
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  color:white; padding:0.9rem 2rem; border-radius:var(--radius-btn);
  font-weight:700; font-size:1rem; text-decoration:none;
  box-shadow:0 8px 22px rgba(15,76,129,0.28);
  transition:transform 0.18s, box-shadow 0.18s; cursor:pointer; border:none;
  font-family:'Source Sans 3',sans-serif; -webkit-tap-highlight-color:transparent;
}
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 12px 30px rgba(15,76,129,0.34); color:white; }
.btn-primary:disabled { opacity:0.55; cursor:not-allowed; transform:none; }

.btn-secondary {
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  background:transparent; color:var(--primary);
  padding:0.9rem 2rem; border-radius:var(--radius-btn);
  font-weight:700; font-size:1rem; text-decoration:none;
  border:2px solid rgba(15,76,129,0.25);
  transition:all 0.18s; cursor:pointer; font-family:'Source Sans 3',sans-serif;
  -webkit-tap-highlight-color:transparent;
}
.btn-secondary:hover { background:var(--primary); color:white; border-color:var(--primary); }

.btn-submit {
  background:linear-gradient(135deg,var(--secondary),var(--secondary-dark));
  color:white; padding:0.9rem 2rem; border-radius:var(--radius-btn);
  font-weight:700; font-size:1.02rem; border:none; cursor:pointer;
  width:100%; font-family:'Source Sans 3',sans-serif; transition:all 0.18s;
  box-shadow:0 8px 22px rgba(20,184,166,0.28); min-height:52px;
}
.btn-submit:hover { transform:translateY(-2px); box-shadow:0 12px 30px rgba(20,184,166,0.34); }
.btn-submit:disabled { opacity:0.55; cursor:not-allowed; transform:none; }

.btn-danger-outline {
  background:rgba(220,38,38,0.06); border:1px solid rgba(220,38,38,0.25);
  color:var(--danger); padding:0.5rem 1rem; border-radius:10px;
  font-size:0.9rem; font-weight:700; cursor:pointer; font-family:'Source Sans 3',sans-serif;
}
.btn-danger-outline:hover { background:var(--danger); color:white; }

/* ===== CARDS — large spacing, 20px radius, soft shadow, hover animation ===== */
.stages-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(260px, 1fr)); gap:1.75rem; }
.stage-card {
  background:var(--card); border-radius:var(--radius-lg); padding:2.25rem;
  box-shadow:var(--shadow); border:1px solid var(--border);
  transition:transform 0.25s cubic-bezier(.2,.8,.2,1), box-shadow 0.25s, border-color 0.25s;
  text-decoration:none; color:inherit;
}
.stage-card:hover, a.stage-card:hover { transform:translateY(-6px); box-shadow:var(--shadow-lg); border-color:rgba(20,184,166,0.35); }
a.stage-card { display:block; }
.stage-icon, .feature-icon {
  width:56px; height:56px; border-radius:14px;
  background:linear-gradient(135deg,rgba(15,76,129,0.08),rgba(20,184,166,0.1));
  color:var(--primary);
  display:flex; align-items:center; justify-content:center; flex-shrink:0; font-size:1.6rem; margin-bottom:1.1rem;
}
.stage-card h3 { font-size:1.2rem; font-weight:800; color:var(--primary); margin-bottom:0.6rem; }
.stage-card p { color:var(--text-2); font-size:1rem; line-height:1.65; }

.card {
  background:var(--card); border-radius:var(--radius-lg); padding:1.75rem;
  box-shadow:var(--shadow); border:1px solid var(--border);
}

/* ===== STRUCTURED CONTENT (WebQuest / Case Study / reading text) ===== */
.card p { margin:0 0 0.9rem; line-height:1.7; color:var(--text); }
.card p:last-child { margin-bottom:0; }
.wq-h3 {
  font-size:1.15rem; font-weight:800; color:var(--primary);
  margin:1.6rem 0 0.75rem; padding-top:1.4rem; border-top:1px solid var(--border);
}
.wq-h3:first-child { margin-top:0; padding-top:0; border-top:none; }
.wq-h4 {
  font-size:1rem; font-weight:700; color:var(--secondary-dark);
  margin:1.1rem 0 0.5rem;
}
.wq-tier {
  display:inline-block; font-size:0.92rem; font-weight:700; color:var(--primary);
  background:rgba(15,76,129,0.06); border:1px solid rgba(15,76,129,0.14);
  border-radius:8px; padding:0.3rem 0.75rem; margin:0.9rem 0 0.4rem;
}
.wq-list { margin:0 0 0.9rem; padding-left:1.4rem; }
.wq-list li { line-height:1.65; margin-bottom:0.4rem; color:var(--text); }
.wq-list li:last-child { margin-bottom:0; }
.wq-list a, .card p a { color:var(--secondary-dark); text-decoration:underline; }

/* ===== TOPIC CARDS (lesson list) ===== */
.topics-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(280px, 1fr)); gap:1.1rem; }
.topic-card {
  --card-accent: var(--primary);
  background:var(--card); border-radius:var(--radius); padding:1.35rem 1.6rem;
  display:flex; align-items:center; justify-content:space-between; gap:1rem;
  box-shadow:0 3px 14px rgba(15,76,129,0.06);
  border:1.5px solid var(--border); border-left:4px solid var(--card-accent);
  text-decoration:none; color:var(--text);
  transition:border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}
/* Cycle each card through the brand palette so the grid reads as lively, not flat. */
.topic-card:nth-child(6n+2) { --card-accent: var(--secondary); }
.topic-card:nth-child(6n+3) { --card-accent: var(--accent); }
.topic-card:nth-child(6n+4) { --card-accent: var(--secondary-dark); }
.topic-card:nth-child(6n+5) { --card-accent: var(--primary-dark); }
.topic-card:nth-child(6n+6) { --card-accent: var(--accent-dark); }
.topic-card:hover {
  border-color:var(--card-accent); box-shadow:0 10px 26px rgba(20,184,166,0.16);
  transform:translateY(-3px);
}
.topic-num {
  width:46px; height:46px; border-radius:12px; flex-shrink:0;
  background:var(--card-accent); color:#fff;
  display:flex; align-items:center; justify-content:center;
  font-family:'Manrope',sans-serif; font-size:1.1rem; font-weight:800;
  box-shadow:0 4px 10px rgba(15,76,129,0.18);
}
.topic-info { flex:1; min-width:0; }
.topic-info h4 { font-size:1.02rem; font-weight:700; color:var(--primary); line-height:1.4; margin-bottom:2px; }
.topic-info p { font-size:0.93rem; color:var(--gray); }

/* ===== FORMS / AUTH ===== */
.auth-wrap { flex:1; display:flex; align-items:center; justify-content:center; padding:2rem; min-height:60vh; }
.auth-card {
  background:var(--card); border-radius:var(--radius-lg); padding:2.5rem 2.25rem;
  box-shadow:var(--shadow-lg); border:1px solid var(--border);
  width:100%; max-width:460px;
}
.auth-card h2 { font-size:1.7rem; font-weight:800; color:var(--primary); margin-bottom:0.4rem; }
.auth-card p { color:var(--text-2); margin-bottom:1.75rem; font-size:1rem; line-height:1.65; }
.field { margin-bottom:1.25rem; }
.field label { display:block; font-size:0.94rem; font-weight:700; color:var(--primary); margin-bottom:0.4rem; }
.field input, .field select, .field textarea {
  width:100%; padding:0.9rem 1rem; border-radius:11px;
  border:1.5px solid var(--border); background:var(--bg);
  font-size:1rem; font-family:'Source Sans 3',sans-serif; color:var(--text);
  transition:border-color 0.18s, box-shadow 0.18s; outline:none;
  -webkit-appearance:none;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color:var(--secondary); box-shadow:0 0 0 3px rgba(20,184,166,0.15);
}
.field .hint { font-size:0.85rem; color:var(--gray); margin-top:0.3rem; }
.field .error { font-size:0.85rem; color:var(--danger); margin-top:0.3rem; display:none; }
.field.has-error input, .field.has-error select { border-color:var(--danger); }
.field.has-error .error { display:block; }
.auth-link { text-align:center; margin-top:1.25rem; font-size:0.97rem; color:var(--gray); }
.auth-link a { color:var(--secondary-dark); font-weight:700; text-decoration:none; }
.auth-link a:hover { text-decoration:underline; }

/* ===== INFO / WARN BOX ===== */
.info-box {
  display:flex; flex-direction:column; gap:0.5rem; padding:1rem 1.25rem; border-radius:14px;
  background:rgba(15,76,129,0.05); border:1px solid rgba(15,76,129,0.14);
  font-size:1rem; line-height:1.65; margin:1rem 0;
}
.info-box p { margin:0; }
.warn-box {
  display:flex; gap:0.75rem; padding:1rem 1.25rem; border-radius:14px;
  background:rgba(245,158,11,0.09); border:1px solid rgba(245,158,11,0.3);
  font-size:1rem; line-height:1.65; margin:1rem 0; color:var(--accent-dark);
}
.error-box {
  padding:0.85rem 1.1rem; border-radius:12px;
  background:rgba(220,38,38,0.06); border:1px solid rgba(220,38,38,0.22);
  font-size:0.9rem; color:var(--danger); margin:0.75rem 0; display:none;
}
.error-box.show { display:block; }
.success-box {
  padding:0.85rem 1.1rem; border-radius:12px;
  background:rgba(22,163,74,0.07); border:1px solid rgba(22,163,74,0.22);
  font-size:0.9rem; color:var(--success); margin:0.75rem 0; display:none;
}
.success-box.show { display:block; }

/* ===== BADGE ===== */
.badge {
  display:inline-block; font-size:0.78rem; font-weight:700; padding:3px 10px;
  border-radius:20px; text-transform:uppercase; letter-spacing:0.04em;
}
.badge-pending { background:rgba(245,158,11,0.14); color:var(--accent-dark); border:1px solid rgba(245,158,11,0.3); }
.badge-reviewed { background:rgba(22,163,74,0.12); color:var(--success); border:1px solid rgba(22,163,74,0.3); }

/* ===== MODAL ===== */
.modal-overlay {
  display:none; position:fixed; inset:0; z-index:500;
  background:rgba(10,54,96,0.6); backdrop-filter:blur(4px);
  align-items:center; justify-content:center; padding:1rem;
}
.modal-overlay.open { display:flex; }
.modal {
  background:var(--card); border-radius:var(--radius-lg); width:100%;
  max-width:1200px; max-height:95dvh; height:95dvh; display:flex; flex-direction:column;
  box-shadow:0 20px 60px rgba(0,0,0,0.3); overflow:hidden;
}
.modal-head { display:flex; align-items:center; justify-content:space-between; padding:1.1rem 1.5rem; border-bottom:1px solid var(--border); flex-shrink:0; }
.modal-head span { font-family:'Manrope',sans-serif; font-weight:700; font-size:1.1rem; color:var(--primary); }
.modal-close {
  background:rgba(220,38,38,0.08); border:1px solid rgba(220,38,38,0.2);
  color:var(--danger); border-radius:9px; padding:0.45rem 0.65rem;
  cursor:pointer; font-size:1rem; line-height:1; display:flex; align-items:center; justify-content:center;
}
.modal-close:hover { background:var(--danger); color:white; }
.modal iframe { flex:1; border:none; min-height:0; width:100%; }

/* ===== TOAST ===== */
.toast {
  position:fixed; bottom:max(1.5rem, env(safe-area-inset-bottom)); left:50%;
  transform:translateX(-50%) translateY(80px); opacity:0;
  background:var(--primary); color:white; padding:0.9rem 1.5rem;
  border-radius:var(--radius-btn); font-size:1rem; font-weight:600;
  box-shadow:0 10px 28px rgba(15,76,129,0.3); z-index:600;
  transition:opacity 0.3s, transform 0.3s; max-width:90vw; text-align:center;
  pointer-events:none;
}
.toast.show { opacity:1; transform:translateX(-50%) translateY(0); }
.toast.success { background:var(--success); }
.toast.error { background:var(--danger); }

/* ===== HERO — academic LMS landing, not chat-app hero ===== */
.hero {
  background:var(--primary-dark);
  padding:clamp(3rem, 7vw, 5.5rem) 2rem;
  position:relative; overflow:hidden; min-height:520px;
  display:flex; align-items:center;
}
/* Rotating photo backdrop — three photos cross-fade behind a navy/teal tint
   so brand colours and text contrast stay consistent no matter which photo is active. */
.hero-bg { position:absolute; inset:0; z-index:0; }
.hero-bg-slide {
  position:absolute; inset:0; background-size:cover; background-position:center;
  opacity:0; transition:opacity 1.6s ease-in-out;
}
.hero-bg-slide.active { opacity:1; }
.hero::before {
  content:''; position:absolute; inset:0; z-index:1;
  /* Darker on the left (behind the text) fading to mostly-clear on the right,
     so the photo reads clearly while headline text stays legible. */
  background:linear-gradient(100deg, rgba(9,32,56,0.72) 0%, rgba(15,76,129,0.4) 45%, rgba(14,146,133,0.22) 100%),
             radial-gradient(ellipse at 78% 30%, rgba(20,184,166,0.18) 0%, transparent 55%),
             radial-gradient(ellipse at 15% 85%, rgba(245,158,11,0.1) 0%, transparent 45%);
}
.hero-inner {
  max-width:1200px; width:100%; margin:0 auto;
  display:grid; grid-template-columns:1.1fr 0.9fr; gap:clamp(2rem, 5vw, 4rem);
  align-items:center; position:relative; z-index:2;
}
.hero-badge {
  display:inline-flex; align-items:center; gap:8px;
  background:rgba(20,184,166,0.16); border:1px solid rgba(20,184,166,0.4);
  border-radius:20px; padding:7px 18px; font-size:0.85rem; color:#7EEBDD;
  margin-bottom:1.5rem; letter-spacing:1.1px; text-transform:uppercase; font-weight:700;
}
.hero h1 {
  font-size:clamp(2rem, 5vw, 3.2rem);
  font-weight:800; line-height:1.16; margin-bottom:1.25rem; color:white;
}
.hero h1 span { color:#7EEBDD; }
.hero p { font-size:clamp(1rem, 2.5vw, 1.12rem); color:rgba(255,255,255,0.86); line-height:1.8; margin-bottom:2rem; }
.hero-btns { display:flex; gap:0.75rem; flex-wrap:wrap; }
.hero-btns .btn-primary, .hero-btns .btn-secondary { min-height:52px; }
.hero-btns .btn-primary { background:linear-gradient(135deg,var(--accent),#FBBF43); box-shadow:0 8px 22px rgba(245,158,11,0.35); }
.hero-btns .btn-primary:hover { box-shadow:0 12px 30px rgba(245,158,11,0.42); }
.hero-btns .btn-secondary { border-color:rgba(255,255,255,0.35); color:white; }
.hero-btns .btn-secondary:hover { background:white; color:var(--primary); }

/* Frosted-glass stats panel — fully transparent over the hero gradient,
   no opaque backdrop layer (a solid-colour blob read as "ugly" here). */
.hero-card-wrap { position:relative; }
.hero-card {
  position:relative;
  background:rgba(255,255,255,0.08); border:1px solid rgba(255,255,255,0.22);
  border-radius:var(--radius-lg); padding:clamp(1.5rem, 3vw, 2.25rem);
  backdrop-filter:blur(16px); -webkit-backdrop-filter:blur(16px);
  box-shadow:0 20px 50px rgba(0,0,0,0.18);
}
.hero-card h3 {
  display:flex; align-items:center; justify-content:center; gap:8px;
  font-size:1.14rem; color:var(--accent); margin-bottom:1.3rem; text-align:center; font-weight:800;
  letter-spacing:0.02em;
}
.stat-grid { display:grid; grid-template-columns:1fr 1fr; gap:0.75rem; margin-bottom:1.4rem; }
.stat-item {
  background:rgba(255,255,255,0.07); border:1px solid rgba(255,255,255,0.16);
  border-radius:13px; padding:1rem 0.9rem; text-align:center;
}
.stat-num { font-family:'Manrope',sans-serif; font-size:clamp(1.5rem, 4vw, 2.1rem); font-weight:800; color:var(--accent); }
.stat-label { font-size:0.84rem; color:rgba(255,255,255,0.72); margin-top:4px; }

.hero-topics-list { display:flex; flex-direction:column; gap:0.55rem; }
.hero-topic-item {
  display:flex; align-items:center; gap:0.7rem;
  background:rgba(255,255,255,0.06); border:1px solid rgba(255,255,255,0.14);
  border-radius:11px; padding:0.7rem 0.9rem;
  font-size:0.92rem; color:rgba(255,255,255,0.9); font-weight:600;
}
.hero-topic-item .ph { color:var(--accent); font-size:1.15rem; flex-shrink:0; }

/* ===== MINI STAT (light background) ===== */
.mini-stat-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(140px, 1fr)); gap:1rem; }
.mini-stat {
  background:var(--card); border-radius:var(--radius); padding:1.15rem;
  text-align:center; box-shadow:0 3px 14px rgba(15,76,129,0.06); border:1.5px solid var(--border);
}
.mini-stat-num { font-family:'Manrope',sans-serif; font-size:1.9rem; font-weight:800; color:var(--secondary-dark); line-height:1; }
.mini-stat-label { font-size:0.82rem; color:var(--gray); font-weight:600; margin-top:5px; }

/* ===== FOOTER ===== */
footer {
  background:var(--primary-dark); color:rgba(255,255,255,0.68);
  text-align:center; padding:2.25rem 1.5rem;
  padding-bottom:max(2.25rem, env(safe-area-inset-bottom));
}
.footer-logo {
  font-family:'Manrope',sans-serif; font-size:1.25rem; font-weight:800;
  color:white; margin-bottom:0.5rem; display:inline-flex; align-items:center; gap:8px;
}
.footer-text { font-size:0.9rem; line-height:1.6; }
.footer-text a { color:#7EEBDD; text-decoration:none; }
.footer-text a:hover { text-decoration:underline; }
.footer-credit { font-size:0.8rem; margin-top:0.6rem; opacity:0.75; }
.footer-credit a { color:#7EEBDD; text-decoration:none; font-weight:700; display:inline-flex; align-items:center; gap:4px; }
.footer-credit a:hover { text-decoration:underline; }

/* ===== TEST STYLES (pre/post-test) ===== */
.test-wrap { max-width:800px; margin:0 auto; }
.test-progress { background:var(--bg2); border-radius:8px; height:8px; margin-bottom:2rem; overflow:hidden; }
.test-progress-bar { height:100%; background:linear-gradient(90deg,var(--secondary),var(--secondary-dark)); border-radius:8px; transition:width 0.4s; }
.test-timer {
  display:inline-flex; align-items:center; gap:6px; font-family:'Manrope',sans-serif;
  font-size:1.22rem; font-weight:800; color:var(--primary); background:rgba(15,76,129,0.06);
  padding:0.5rem 1.25rem; border-radius:11px; border:1px solid var(--border);
}
.test-timer.urgent { color:var(--danger); background:rgba(220,38,38,0.08); border-color:rgba(220,38,38,0.25); animation:pulse 1s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.7} }
.test-question-card {
  background:var(--card); border-radius:var(--radius-lg); padding:2rem;
  box-shadow:var(--shadow); border:1px solid var(--border); margin-bottom:1.5rem;
}
.test-q-num { font-size:0.9rem; color:var(--gray); font-weight:700; margin-bottom:0.75rem; text-transform:uppercase; letter-spacing:0.05em; }
.test-q-text { font-size:1.12rem; font-weight:600; color:var(--primary); line-height:1.65; margin-bottom:1.5rem; }
.test-options { display:grid; gap:0.75rem; }
.test-option {
  display:flex; align-items:center; gap:1rem; padding:1rem 1.25rem;
  border-radius:13px; border:2px solid var(--border);
  cursor:pointer; transition:all 0.18s; background:var(--card);
  font-size:1.02rem; color:var(--text); font-weight:600;
  -webkit-tap-highlight-color:transparent; text-align:left; width:100%;
  font-family:'Source Sans 3',sans-serif;
}
.test-option:hover { border-color:var(--secondary); background:rgba(20,184,166,0.05); }
.test-option.selected { border-color:var(--secondary); background:rgba(20,184,166,0.1); color:var(--secondary-dark); }
.test-option.correct { border-color:var(--success); background:rgba(22,163,74,0.1); color:var(--success); }
.test-option.wrong { border-color:var(--danger); background:rgba(220,38,38,0.08); color:var(--danger); }
.option-letter {
  width:38px; height:38px; border-radius:11px; flex-shrink:0;
  background:rgba(15,76,129,0.07); display:flex; align-items:center; justify-content:center;
  font-family:'Manrope',sans-serif; font-weight:800; font-size:1rem; color:var(--primary);
}
.test-option.selected .option-letter { background:var(--secondary); color:white; }
.test-result-card { background:var(--card); border-radius:var(--radius-lg); padding:3rem 2rem; text-align:center; box-shadow:var(--shadow-lg); border:1px solid var(--border); }
.test-result-score { font-family:'Manrope',sans-serif; font-size:4rem; font-weight:800; color:var(--secondary-dark); line-height:1; }
.test-result-label { font-size:1.15rem; color:var(--text-2); margin:0.5rem 0 2rem; }
.test-result-detail { display:grid; grid-template-columns:repeat(3, 1fr); gap:1rem; margin-bottom:2rem; }
.test-result-item { padding:1rem; background:var(--bg); border-radius:13px; }
.test-result-item-num { font-family:'Manrope',sans-serif; font-size:1.5rem; font-weight:800; color:var(--primary); }
.test-result-item-label { font-size:0.88rem; color:var(--gray); font-weight:600; }

/* ===== GRADES / LEADERBOARD LIST ===== */
.grades-list { display:flex; flex-direction:column; gap:0.75rem; }
.grade-lesson-group { border:1.5px solid var(--border); border-radius:var(--radius-lg); margin-bottom:0.9rem; overflow:hidden; background:var(--card); }
.grade-lesson-summary {
  display:flex; align-items:center; gap:0.75rem;
  padding:1rem 1.25rem; cursor:pointer; font-weight:800; color:var(--primary);
  list-style:none;
}
.grade-lesson-summary::-webkit-details-marker { display:none; }
.grade-lesson-summary::after { content:'\25BE'; font-size:0.9rem; color:var(--gray); margin-left:auto; transition:transform 0.2s; }
.grade-lesson-group[open] .grade-lesson-summary::after { transform:rotate(180deg); }
.grade-lesson-count { font-size:0.85rem; font-weight:600; color:var(--gray); }
.grade-lesson-items { padding:0 1.25rem 1.1rem; display:flex; flex-direction:column; gap:0.65rem; }
.grade-item {
  background:var(--card); border-radius:var(--radius); padding:1.1rem 1.4rem;
  display:flex; align-items:center; justify-content:space-between; gap:1rem;
  box-shadow:0 3px 10px rgba(15,76,129,0.05); border:1.5px solid var(--border);
}
.grade-info h4 { font-size:1rem; font-weight:700; color:var(--primary); }
.grade-info p { font-size:0.9rem; color:var(--gray); margin-top:2px; }
.grade-score { font-family:'Manrope',sans-serif; font-size:1.3rem; font-weight:800; color:var(--secondary-dark); flex-shrink:0; }

.lb-course-section { margin-bottom:2.25rem; }
.lb-course-section:last-child { margin-bottom:0; }
.lb-course-heading {
  display:flex; align-items:center; gap:0.5rem;
  font-size:1.15rem; font-weight:800; color:var(--primary); margin-bottom:0.85rem;
}
.leaderboard-table { border-radius:var(--radius-lg); overflow:hidden; box-shadow:var(--shadow); border:1px solid var(--border); }
.lb-header, .lb-row {
  display:grid; grid-template-columns:56px minmax(150px, 2fr) 1fr 1fr; gap: 0.5rem;
  align-items:center; padding:0.9rem 1.25rem; border-bottom:1px solid var(--border);
}
.lb-header.no-course, .lb-row.no-course { grid-template-columns:56px minmax(150px, 2fr) 1fr; }
.lb-header { background:linear-gradient(135deg,var(--primary),var(--primary-light)); color:white; font-size:0.86rem; font-weight:700; text-transform:uppercase; letter-spacing:0.05em; }
.lb-row { background:var(--card); transition:background 0.15s; }
.lb-row:hover { background:rgba(20,184,166,0.05); }
.lb-row:last-child { border-bottom:none; }
.lb-rank { font-family:'Manrope',sans-serif; font-size:1.1rem; font-weight:800; color:var(--primary); }
.lb-row.rank-1 .lb-rank { color:var(--accent); }
.lb-row.rank-2 .lb-rank { color:#94A3B8; }
.lb-row.rank-3 .lb-rank { color:#B45309; }
.lb-name { font-weight:700; color:var(--primary); font-size:1rem; }
.lb-course { color:var(--gray); font-size:0.9rem; }
.lb-score { font-family:'Manrope',sans-serif; font-weight:800; color:var(--secondary-dark); font-size:1rem; }
.lb-empty { padding:2.5rem; text-align:center; color:var(--gray); background:var(--card); font-size:1rem; }

/* ===== SCAMPER ===== */
.progress-track { background:var(--bg2); border-radius:8px; height:8px; overflow:hidden; }
.progress-fill { height:100%; border-radius:8px; transition:width 0.4s; background:linear-gradient(90deg,var(--accent),var(--accent-dark)); }
.scamper-card {
  background:var(--card); border-radius:var(--radius-lg); padding:1.6rem;
  box-shadow:var(--shadow); border:1px solid var(--border); margin-bottom:1.25rem;
}
.scamper-card h3 { font-family:'Manrope',sans-serif; font-weight:800; color:var(--primary); margin-bottom:0.4rem; }
.scamper-card p.task { color:var(--text-2); font-size:0.95rem; margin-bottom:0.85rem; }
.scamper-card textarea {
  width:100%; padding:0.8rem 1rem; border-radius:11px;
  border:1.5px solid var(--border); background:var(--bg);
  font-size:0.95rem; font-family:'Source Sans 3',sans-serif; color:var(--text);
  outline:none; resize:vertical;
}
.scamper-card textarea:focus { border-color:var(--secondary); box-shadow:0 0 0 3px rgba(20,184,166,0.15); }

/* ===== TAB BUTTONS ===== */
.tab-btn { color:var(--text); background:none; border:none; font-size:0.97rem; font-weight:700; padding:0.65rem 1.1rem; cursor:pointer; font-family:'Source Sans 3',sans-serif; }
.tab-btn.active { color:var(--primary); border-bottom:2.5px solid var(--secondary); }
.tab-btn:hover { color:var(--secondary-dark); }

/* ===== RESPONSIVE ===== */
@media (max-width:1024px) {
  .header-nav { display:none; }
  .hamburger { display:flex; }
  #navUserBlock { flex-shrink:0; }
  .nav-user { padding:0.3rem 0.45rem; gap:0.4rem; }
  .nav-user-info { display:none; }
  .nav-user .btn-nav-logout { display:none; }
  .btn-login { font-size:0.85rem !important; padding:8px 14px !important; }
  .hero-inner { grid-template-columns:1fr; gap:2rem; }
  .hero-card-wrap { order:-1; max-width:440px; margin:0 auto; }
  .stages-grid { grid-template-columns:repeat(auto-fit, minmax(240px, 1fr)); }
  .topics-grid { grid-template-columns:repeat(auto-fit, minmax(240px, 1fr)); }
}

@media (max-width:768px) {
  header { padding:0 max(1rem, env(safe-area-inset-right)) 0 max(1rem, env(safe-area-inset-left)); }
  .header-inner { height:96px; gap:0.5rem; grid-template-columns:auto 1fr auto; }
  .logo img { height:72px; }
  .logo-badge { width:40px; height:40px; }
  .main { padding:1.25rem max(1rem, env(safe-area-inset-left)); }
  section { padding:3rem 1rem; }
  .section-title { font-size:clamp(1.6rem, 5vw, 2.1rem); }
  .page-header { padding:2rem 1rem 1.75rem; }
  .page-header h1 { font-size:clamp(1.5rem, 5vw, 2rem); }
  .hero { min-height:auto; padding:2.5rem 1rem 3rem; }
  .hero-card-wrap { max-width:100%; }
  .hero-btns { flex-direction:column; width:100%; }
  .hero-btns .btn-primary, .hero-btns .btn-secondary { width:100%; }
  .stages-grid, .topics-grid { grid-template-columns:1fr; gap:1rem; }
  .stage-card { padding:1.5rem 1.25rem; }
  .topic-card { padding:1rem 1.25rem; }
  .modal { height:100dvh; max-height:100dvh; border-radius:0; max-width:100%; }
  .toast { left:1rem; right:1rem; bottom:max(1rem, env(safe-area-inset-bottom)); max-width:none; transform:translateY(80px); }
  .toast.show { transform:translateY(0); }
  .auth-wrap { padding:1rem; }
  .auth-card { padding:2rem 1.25rem; }
  .test-result-detail { grid-template-columns:repeat(3, 1fr); gap:0.5rem; }
  .test-option { padding:0.9rem 1rem; }
  .lb-header, .lb-row { grid-template-columns:40px minmax(120px, 1fr) 70px; }
  .lb-course { display:none; }
}

@media (prefers-reduced-motion:reduce) {
  *, *::before, *::after { animation-duration:0.01ms !important; transition-duration:0.01ms !important; }
}