/* TestSeriesPro — app.testseriespro.com
   Design goals: huge tap targets, high contrast, minimal text, icon-first,
   works on a cheap Android phone over a slow connection, no build step. */

:root {
  /* TestSeriesPro brand palette */
  --primary: #1C75BC;
  --primary-dark: #2B3990;
  --accent-yellow: #F9ED32;
  --accent-yellow-text: #6b6100;
  --success: #178a4c;
  --danger: #d1332f;
  --warn: #b8860b;
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #1a1f2b;
  --muted: #848689;
  --border: #dde3ec;
  --radius: 14px;
  --tap: 52px;

  /* Sidebar (shared across student / institution / super-admin shells) */
  --sidebar-bg: #2B3990;
  --sidebar-bg-alt: #24316f;
  --sidebar-text: rgba(255,255,255,.72);
  --sidebar-text-active: #ffffff;
  --sidebar-active-bg: rgba(255,255,255,.10);
  --sidebar-accent: #F9ED32;
  --sidebar-width: 240px;

  font-size: 17px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans", "Segoe UI", Arial, sans-serif;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--primary); text-decoration: none; }

img { max-width: 100%; }

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ---------- Top bar ---------- */
.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}
.topbar-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand {
  font-size: 22px;
  font-weight: 800;
  color: var(--primary-dark);
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand-mark {
  font-size: 26px;
}
.topbar-actions { display: flex; align-items: center; gap: 8px; }

.lang-toggle {
  border: 2px solid var(--border);
  background: var(--card);
  border-radius: 999px;
  padding: 6px 14px;
  font-weight: 700;
  cursor: pointer;
  font-size: 15px;
  min-height: 40px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: var(--tap);
  padding: 12px 24px;
  border-radius: var(--radius);
  border: none;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  text-align: center;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-outline { background: var(--card); color: var(--primary); border: 2px solid var(--primary); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-block { width: 100%; }
.btn-lg { font-size: 20px; padding: 16px 24px; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

/* ---------- Cards ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}
.card-clickable { cursor: pointer; }
.card-clickable:hover { border-color: var(--primary); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 16px;
}

/* ---------- Forms ---------- */
label { display: block; font-weight: 700; margin-bottom: 6px; font-size: 16px; }
input, select, textarea {
  width: 100%;
  min-height: var(--tap);
  padding: 12px 14px;
  border: 2px solid var(--border);
  border-radius: 10px;
  font-size: 18px;
  margin-bottom: 16px;
  background: #fff;
  color: var(--text);
  font-family: inherit;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary); }

.field-error { color: var(--danger); font-size: 14px; margin-top: -10px; margin-bottom: 12px; }

/* ---------- Hero (landing page) ---------- */
.hero {
  padding: 48px 0 32px;
  text-align: center;
}
.hero h1 {
  font-size: 34px;
  margin: 0 0 12px;
  color: var(--primary-dark);
}
.hero p { font-size: 19px; color: var(--muted); max-width: 640px; margin: 0 auto 28px; }
.hero-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.role-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin: 40px 0;
}
.role-card {
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
}
.role-card .icon { font-size: 46px; display: block; margin-bottom: 12px; }
.role-card h3 { margin: 0 0 8px; font-size: 22px; }
.role-card p { color: var(--muted); margin: 0 0 18px; }

.feature-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px;
  margin: 32px 0;
}
.feature-item { text-align: center; padding: 12px; }
.feature-item .icon { font-size: 36px; display: block; margin-bottom: 8px; }
.feature-item h4 { margin: 0 0 4px; font-size: 17px; }
.feature-item p { color: var(--muted); font-size: 14px; margin: 0; }

footer {
  text-align: center;
  padding: 28px 16px 40px;
  color: var(--muted);
  font-size: 14px;
}

/* ---------- Auth pages ---------- */
.auth-wrap {
  max-width: 420px;
  margin: 40px auto;
  padding: 0 16px;
}
.auth-card { background: var(--card); border-radius: var(--radius); border: 1px solid var(--border); padding: 28px 24px; }
.auth-card h2 { margin-top: 0; text-align: center; }
.auth-switch { text-align: center; margin-top: 16px; font-size: 16px; }

.alert {
  padding: 12px 14px;
  border-radius: 10px;
  margin-bottom: 16px;
  font-size: 15px;
}
.alert-error { background: #fdeceb; color: var(--danger); border: 1px solid #f4c2c0; }
.alert-success { background: #e9f7ef; color: var(--success); border: 1px solid #b9e6cd; }
.alert-info { background: #eaf1ff; color: var(--primary-dark); border: 1px solid #c6d9ff; }

/* ---------- App shell (test-taking header only) ---------- */
.app-header {
  background: var(--sidebar-bg);
  color: #fff;
  padding: 14px 0;
}
.app-header .container { display: flex; align-items: center; justify-content: space-between; }
.app-header .brand { color: #fff; }
.app-header .user-chip {
  background: rgba(255,255,255,.15);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 14px;
  display: flex;
  gap: 10px;
  align-items: center;
}
.app-header .user-chip a { color: #fff; text-decoration: underline; }

/* ---------- Sidebar dashboard shell (student / institution / super-admin) ---------- */
.app-shell { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  padding: 18px 14px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 30;
}
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  color: #fff;
  font-weight: 800;
  font-size: 18px;
  padding: 6px 8px 18px;
}
.sidebar-nav { display: flex; flex-direction: column; gap: 3px; flex: 1; }
.sidebar-section-label {
  color: rgba(255,255,255,.4);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  padding: 14px 10px 6px;
}
.sidebar-link {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 11px 12px;
  border-radius: 10px;
  color: var(--sidebar-text);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border-left: 3px solid transparent;
  background: none;
  width: 100%;
  text-align: left;
  font-family: inherit;
}
.sidebar-link .icon { font-size: 19px; width: 22px; text-align: center; flex-shrink: 0; }
.sidebar-link:hover { background: var(--sidebar-bg-alt); color: var(--sidebar-text-active); }
.sidebar-link.active {
  background: var(--sidebar-active-bg);
  color: var(--sidebar-text-active);
  border-left-color: var(--sidebar-accent);
}
.sidebar-footer {
  border-top: 1px solid rgba(255,255,255,.14);
  padding-top: 12px;
  margin-top: 10px;
}
.sidebar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
}
.sidebar-user .avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(255,255,255,.15);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 13px;
  flex-shrink: 0;
}
.sidebar-user .who { flex: 1; min-width: 0; }
.sidebar-user .name { color: #fff; font-size: 13px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-user .role { color: rgba(255,255,255,.55); font-size: 12px; text-transform: capitalize; }
.sidebar-user .logout { color: rgba(255,255,255,.6); flex-shrink: 0; }
.sidebar-user .logout:hover { color: #fff; }

.hamburger-btn {
  display: none;
  background: var(--sidebar-bg);
  color: #fff;
  border: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  font-size: 20px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.main-content {
  flex: 1;
  min-width: 0;
  padding: 26px 32px 60px;
}
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}
.page-header h1 { margin: 0 0 4px; font-size: 25px; }
.page-header .subtitle { color: var(--muted); font-size: 15px; margin: 0; }

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10,15,30,.45);
  z-index: 25;
}

@media (max-width: 880px) {
  .hamburger-btn { display: flex; }
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    transform: translateX(-100%);
    transition: transform .2s ease;
    box-shadow: 0 0 0 2000px rgba(0,0,0,0);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar.open ~ .sidebar-overlay,
  .app-shell.sidebar-open .sidebar-overlay { display: block; }
  .mobile-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 12px 16px;
    background: #fff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 20;
  }
  .main-content { padding: 18px 16px 50px; }
}
@media (min-width: 881px) {
  .mobile-topbar { display: none; }
}

.breadcrumbs { font-size: 15px; color: var(--muted); margin: 16px 0; }
.breadcrumbs a { color: var(--primary); }

.category-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: 999px;
  padding: 10px 18px;
  margin: 4px 6px 4px 0;
  font-weight: 700;
  cursor: pointer;
  font-size: 16px;
}
.category-chip:hover { border-color: var(--primary); }

.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px,1fr)); gap: 14px; margin: 20px 0; }
.stat-box { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; text-align: center; }
.stat-box .value { font-size: 30px; font-weight: 800; color: var(--primary-dark); }
.stat-box .label { color: var(--muted); font-size: 14px; }

table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: var(--radius); overflow: hidden; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); font-size: 15px; }
th { background: #eef2fa; color: var(--muted); font-size: 13px; text-transform: uppercase; }

.tabs { display: flex; gap: 6px; margin: 20px 0; flex-wrap: wrap; }
.tab-btn {
  background: var(--card);
  border: 2px solid var(--border);
  padding: 10px 18px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  font-size: 15px;
}
.tab-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---------- Test taking ---------- */
.timer {
  font-size: 20px;
  font-weight: 800;
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: 999px;
  padding: 8px 18px;
}
.timer.low { color: var(--danger); border-color: var(--danger); }

.question-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; margin-bottom: 18px; }
.question-card .q-number { color: var(--muted); font-weight: 700; font-size: 14px; margin-bottom: 6px; }
.question-card .q-text { font-size: 19px; font-weight: 600; margin-bottom: 16px; }
.option-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 2px solid var(--border);
  border-radius: 12px;
  margin-bottom: 10px;
  cursor: pointer;
  font-size: 17px;
}
.option-row:hover { border-color: var(--primary); }
.option-row.selected { border-color: var(--primary); background: #eaf1ff; }
.option-row input { width: 22px; height: 22px; margin: 0; min-height: 0; flex-shrink: 0; }
.option-row.correct { border-color: var(--success); background: #e9f7ef; }
.option-row.incorrect { border-color: var(--danger); background: #fdeceb; }

.qnav-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(44px,1fr)); gap: 8px; }
.qnav-btn {
  min-height: 44px;
  border-radius: 8px;
  border: 2px solid var(--border);
  background: var(--card);
  font-weight: 700;
  cursor: pointer;
}
.qnav-btn.answered { background: var(--success); color: #fff; border-color: var(--success); }
.qnav-btn.current { border-color: var(--primary); border-width: 3px; }

.sticky-bottom {
  position: sticky;
  bottom: 0;
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 14px 0;
  margin-top: 24px;
}

.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 700; }
.badge-easy { background: #e9f7ef; color: var(--success); }
.badge-medium { background: #fff6e5; color: var(--warn); }
.badge-hard { background: #fdeceb; color: var(--danger); }
.badge-published { background: #e9f7ef; color: var(--success); }
.badge-draft { background: #eef0f4; color: var(--muted); }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 720px) {
  .two-col { grid-template-columns: 1fr; }
  .hero h1 { font-size: 26px; }
  :root { font-size: 16px; }
}

.hidden { display: none !important; }
.muted { color: var(--muted); }
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.spacer { height: 16px; }