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

:root{
  --bg:#fafafa;
  --text:#0f172a;
  --muted:#64748b;

  --brand:#6366f1;
  --brand-dark:#4f46e5;
  --border:#e5e7eb;
  --card:#ffffff;

  --shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 18px 40px rgba(15, 23, 42, 0.10);

  --ok:#22c55e;
  --bad:#ef4444;
  --warning:#f59e0b;

  --gradient-1: linear-gradient(135deg,#667eea 0%,#764ba2 100%);
  --gradient-2: linear-gradient(135deg,#f093fb 0%,#f5576c 100%);
  --gradient-3: linear-gradient(135deg,#4facfe 0%,#00f2fe 100%);

  --radius: 18px;
  --radius-lg: 24px;

  --container: 1200px;
}

/* ============ RESET ============ */
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  font-family:'Inter', ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  overflow-x:hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
h1,h2,h3,h4,h5,h6{
  font-family:'Poppins', sans-serif;
  letter-spacing:-0.02em;
}
a{color:inherit;text-decoration:none;transition:150ms ease;}
img{max-width:100%;display:block;}

/* ============ LAYOUT ============ */
.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 28px 24px;
}

.section{ padding: 56px 0; }
.section.tight{ padding: 40px 0; }
.section.alt{
  background: #f6f8ff;
  border-top: 1px solid rgba(229,231,235,.7);
  border-bottom: 1px solid rgba(229,231,235,.7);
}

.page-head{ margin: 10px 0 22px 0; }
.kicker{
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  font-weight: 800;
  color: rgba(99,102,241,.9);
}
.lead{
  color: var(--muted);
  font-size: 16px;
  margin-top: 8px;
}

/* ============ NAVBAR ============ */
.nav{
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(229,231,235,.8);
}
.nav .inner{
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 18px;
  flex-wrap: nowrap;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight: 900;
  font-size: 18px;
}
.brand .dot{
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: #667eea;
  background-image: var(--gradient-1);
  box-shadow: 0 8px 18px rgba(99,102,241,.25);
}

.navlinks{
  display:flex;
  gap: 18px;
  align-items:center;
  white-space: nowrap;
}
.navlinks a{
  font-weight: 600;
  font-size: 14px;
  color: rgba(100,116,139,.95);
  padding: 8px 10px;
  border-radius: 12px;
}
.navlinks a:hover{
  color: var(--text);
  background: rgba(99,102,241,.08);
}
.navlinks a.active{
  color: var(--text);
  background: rgba(99,102,241,.10);
}

.navright{
  display:flex;
  align-items:center;
  gap: 10px;
  white-space: nowrap;
}

.pill{
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(229,231,235,.9);
  background: rgba(255,255,255,.9);
  font-size: 12px;
  font-weight: 700;
  color: rgba(15,23,42,.9);
}

/* ✅ Mobile nav behavior */
@media (max-width: 920px){
  .navlinks{display:none;}
}

/* ============ BUTTONS ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap: 8px;
  padding: 11px 16px;
  border-radius: 14px;
  background: var(--brand);
  color:#fff;
  font-weight: 800;
  font-size: 14px;
  border: 1px solid rgba(99,102,241,.2);
  cursor:pointer;
  box-shadow: 0 10px 18px rgba(99,102,241,.20);
  transition: 180ms ease;
}
.btn:hover{
  background: var(--brand-dark);
  transform: translateY(-1px);
  box-shadow: 0 14px 26px rgba(99,102,241,.26);
}
.btn.secondary{
  background: #fff;
  color: var(--text);
  border: 1px solid rgba(229,231,235,.95);
  box-shadow: 0 10px 18px rgba(15,23,42,.06);
}
.btn.secondary:hover{
  border-color: rgba(99,102,241,.35);
  color: var(--brand-dark);
  background: #fff;
}
.btn:disabled{opacity:.6;cursor:not-allowed;transform:none;}

/* ============ TYPOGRAPHY SCALE ============ */
h1{ font-size: 46px; line-height: 1.1; }
h2{ font-size: 28px; line-height: 1.15; }
h3{ font-size: 18px; line-height: 1.2; }
@media (max-width: 640px){
  h1{font-size: 34px;}
  h2{font-size: 24px;}
}

/* ============ GRID + CARDS ============ */
.grid{display:grid;gap:18px;}

/* Default columns */
.grid.cols-3{grid-template-columns: repeat(3, 1fr);}
.grid.cols-2{grid-template-columns: repeat(2, 1fr);}

/* Tablet */
@media (max-width: 980px){
  .grid.cols-3{grid-template-columns: repeat(2, 1fr);}
}
/* Mobile */
@media (max-width: 640px){
  .grid.cols-3,.grid.cols-2{grid-template-columns: 1fr;}
}

/* ✅ Wide screens: show 4 cards for catalogs (intentional) */
@media (min-width:1100px){
  .grid.cols-3{ grid-template-columns: repeat(4, 1fr); }
}

/* Denser gap for catalogs */
.grid.cols-3{ gap: 14px; }

.card{
  background: var(--card);
  border: 1px solid rgba(229,231,235,.95);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  transition: 200ms ease;
}
.card:hover{
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.muted{color: var(--muted);}

.row{display:flex;gap:12px;align-items:center;}

/* ============ HERO (if you use it) ============ */
.hero{
  display:grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 22px;
  align-items:center;
  padding: 56px 0;
}
.hero h1{
  background-image: var(--gradient-1);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
}
.hero p{
  color: var(--muted);
  font-size: 17px;
  margin-top: 12px;
}
.hero .actions{display:flex;gap:12px;flex-wrap:wrap;margin-top: 14px;}
.hero .panel{
  border-radius: var(--radius-lg);
  padding: 20px;
  background: linear-gradient(145deg,#ffffff,#f7f8ff);
  border: 1px solid rgba(229,231,235,.95);
  box-shadow: var(--shadow-lg);
}
@media (max-width: 920px){
  .hero{grid-template-columns: 1fr;}
}

/* ============ PRICE ============ */
.price{
  font-weight: 900;
  color: var(--brand-dark);
  font-size: 20px;
  font-family:'Poppins', sans-serif;
}

/* ============ FORMS ============ */
.input, textarea{
  width:100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(229,231,235,.95);
  background:#fff;
  color: var(--text);
  outline:none;
  font-size: 14px;
  transition: 150ms ease;
}
.input:focus, textarea:focus{
  border-color: rgba(99,102,241,.55);
  box-shadow: 0 0 0 4px rgba(99,102,241,.10);
}
label{
  display:block;
  margin: 12px 0 6px 0;
  font-size: 13px;
  font-weight: 700;
  color: rgba(15,23,42,.95);
}

/* ============ DIALOG (brochure etc.) ============ */
dialog{
  border: 1px solid rgba(229,231,235,.95);
  box-shadow: var(--shadow-lg);
  background: #fff;
}
dialog::backdrop{
  background: rgba(2,6,23,.42);
}

/* ============ TOAST ============ */
.toast{
  position: fixed;
  right: 18px;
  bottom: 18px;
  padding: 14px 16px;
  border-radius: 16px;
  background: #0b1220;
  color: #fff;
  box-shadow: 0 16px 40px rgba(2,6,23,.35);
  max-width: 360px;
  font-weight: 700;
  z-index: 1000;
}
.hidden{display:none !important;}

/* ============ FOOTER ============ */
.footer{
  margin-top: 56px;
  padding: 20px 0;
  border-top: 1px solid rgba(229,231,235,.9);
  color: var(--muted);
  font-size: 14px;
  text-align:center;
}

/* ============ CAROUSEL ============ */
.carousel-container{
  position: relative;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 56px;
}
.carousel-wrapper{
  overflow:hidden;
  border-radius: var(--radius-lg);
}
.carousel-track{
  display:flex;
  gap: 18px;
  transition: transform .35s ease;
  will-change: transform;
}
.ranker-card{
  min-width: calc(33.333% - 12px);
  background: #fff;
  border: 1px solid rgba(229,231,235,.95);
  border-radius: var(--radius-lg);
  padding: 22px 18px;
  text-align:left;
  box-shadow: var(--shadow);
}
.ranker-avatar{
  width: 46px;
  height: 46px;
  border-radius: 999px;
  background: #667eea;
  background-image: var(--gradient-1);
  border: 3px solid #fff;
  box-shadow: 0 10px 20px rgba(15,23,42,.12);
  margin-bottom: 10px;
}
.ranker-card h3{
  font-size: 15px;
  margin: 6px 0 6px 0;
}
.ranker-card .muted{
  font-size: 13px;
  line-height: 1.55;
}

.carousel-btn{
  position:absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 42px;
  height: 42px;
  border-radius: 999px;
  background: rgba(255,255,255,.92);
  border: 1px solid rgba(229,231,235,.95);
  cursor:pointer;
  font-size: 22px;
  display:flex;
  align-items:center;
  justify-content:center;
  box-shadow: 0 12px 26px rgba(15,23,42,.10);
  transition: 160ms ease;
}
.carousel-btn:hover:not(:disabled){
  background: var(--brand);
  color: #fff;
  border-color: rgba(99,102,241,.4);
}
.carousel-btn:disabled{opacity:.35;cursor:not-allowed;}
.carousel-btn.prev{left: 8px;}
.carousel-btn.next{right: 8px;}

@media (max-width: 920px){
  .ranker-card{min-width: calc(50% - 9px);}
  .carousel-container{padding: 0 48px;}
}
@media (max-width: 640px){
  .ranker-card{min-width: 100%;}
  .carousel-container{padding: 0 42px;}
}

/* ============ MOCK TEST ============ */
.question{
  border: 1px solid rgba(229,231,235,.95);
  border-radius: var(--radius);
  padding: 16px;
  background:#fff;
  margin-bottom: 14px;
  box-shadow: var(--shadow);
}
.option{
  border: 1px solid rgba(229,231,235,.95);
  border-radius: 14px;
  padding: 12px 14px;
  margin: 10px 0;
  cursor:pointer;
  user-select:none;
  background:#fff;
  transition: 160ms ease;
}
.option:hover{
  border-color: rgba(99,102,241,.45);
  background: rgba(99,102,241,.05);
}
.option.correct{border-color: var(--ok); background: rgba(34,197,94,.12); font-weight: 700;}
.option.wrong{border-color: var(--bad); background: rgba(239,68,68,.12);}

.headerline{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap: 12px;
  flex-wrap: wrap;
}
.clock{
  font-variant-numeric: tabular-nums;
  font-size: 16px;
  font-weight: 900;
  padding: 10px 14px;
  border-radius: 14px;
  border: 2px solid rgba(99,102,241,.6);
  background: rgba(99,102,241,.06);
  color: var(--brand-dark);
  font-family:'Poppins', sans-serif;
}

/* Chips used in mentor-talk */
.meta-row{display:flex;gap:8px;flex-wrap:wrap;}
.meta-chip, .tag-chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid rgba(229,231,235,.95);
  background: rgba(255,255,255,.9);
  font-size: 12px;
  font-weight: 800;
  color: rgba(15,23,42,.85);
}

/* ============ UTILITIES ============ */
.text-center{text-align:center;}
.mt-4{margin-top:16px;}
.mb-4{margin-bottom:16px;}
.gap-2{gap:8px;}
hr{border:0;border-top:1px solid rgba(229,231,235,.95);margin:18px 0;}

/* ======================================================================
   BOOKS + TESTS CARD (SHARED)
   ====================================================================== */

.book-card{
  display:flex;
  flex-direction:column;
  padding: 14px;
}

.book-card .cover{
  width:100%;
  border-radius: 16px;
  overflow:hidden;
  border: 1px solid rgba(229,231,235,.95);
  background: #f3f4f6;
}

.book-card .cover img{
  width:100%;
  height: 180px;
  object-fit: cover;
  display:block;
}

.cover-fallback{
  height:180px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size: 34px;
  color: rgba(15,23,42,.55);
}

.book-card .card-body{
  padding-top: 12px;
  display:flex;
  flex-direction:column;
  gap: 8px;
}
.book-card .card-title{
  font-size: 16px;
  line-height: 1.25;
}
.book-card .card-desc{
  font-size: 13px;
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 40px;
}
.book-card .card-footer{
  margin-top: 6px;
  justify-content: space-between;
  align-items: center;
}

@media (max-width: 980px){
  .book-card .cover img, .cover-fallback{ height: 160px; }
}

@media (max-width: 640px){
  .book-card .cover img, .cover-fallback{ height: 180px; }
}