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

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

:root {
  --primary:      #0f172a;
  --primary-lt:   #1e293b;
  --accent:       #4f46e5;
  --accent-lt:    #eef2ff;
  --accent-mid:   #c7d2fe;
  --green:        #059669;
  --green-lt:     #d1fae5;
  --amber:        #d97706;
  --bg:           #f8fafc;
  --section-bg:   #ffffff;
  --card-bg:      #ffffff;
  --text:         #1e293b;
  --muted:        #64748b;
  --border:       #e2e8f0;
  --shadow-sm:    0 1px 3px rgba(15,23,42,0.07), 0 1px 2px rgba(15,23,42,0.04);
  --shadow-md:    0 4px 12px rgba(15,23,42,0.1), 0 2px 4px rgba(15,23,42,0.06);
  --shadow-lg:    0 12px 32px rgba(15,23,42,0.12);
  --footer-bg:    #0f172a;
  --footer-text:  #94a3b8;
  --radius:       12px;
}

body {
  font-family: 'Inter', 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ── */
nav {
  background: var(--primary);
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  border-bottom: 1px solid var(--primary-lt);
  box-shadow: var(--shadow-md);
}

.logo {
  font-family: 'Playfair Display', serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: 0.5px;
}
.logo span { color: #818cf8; }

.nav-center { flex: 1; max-width: 480px; margin: 0 1.5rem; }

.search-box {
  display: flex;
  width: 100%;
  border-radius: 8px;
  overflow: hidden;
  border: 1.5px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.06);
  transition: border-color 0.2s;
}
.search-box:focus-within { border-color: rgba(129,140,248,0.6); }
.search-box input {
  flex: 1;
  border: none;
  padding: 0.5rem 1rem;
  font-size: 0.88rem;
  outline: none;
  background: transparent;
  color: #fff;
  font-family: 'Inter', sans-serif;
}
.search-box input::placeholder { color: rgba(255,255,255,0.4); }
.search-box button {
  background: var(--accent);
  border: none;
  padding: 0 1.1rem;
  cursor: pointer;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  transition: background 0.2s;
  font-family: 'Inter', sans-serif;
}
.search-box button:hover { background: #4338ca; }

.nav-icons { display: flex; align-items: center; gap: 0.75rem; }
.nav-icons a {
  color: #94a3b8;
  text-decoration: none;
  position: relative;
  padding: 7px;
  border-radius: 8px;
  transition: background 0.15s, color 0.15s;
}
.nav-icons a:hover { background: rgba(255,255,255,0.08); color: #fff; }
.nav-icons svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; display: block; }

.cart-badge {
  position: absolute;
  top: 2px; right: 2px;
  background: var(--accent);
  color: #fff;
  font-size: 0.55rem;
  font-weight: 800;
  width: 14px; height: 14px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}

.hamburger { display: none; flex-direction: column; gap: 4px; cursor: pointer; padding: 6px; }
.hamburger span { display: block; width: 20px; height: 2px; background: #94a3b8; border-radius: 2px; }

/* ── MOBILE SEARCH ── */
.mobile-search {
  display: none;
  background: var(--primary-lt);
  padding: 0.65rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.mobile-search.open { display: block; }

/* ── HERO ── */
.hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 60%, #312e81 100%);
  color: #fff;
  padding: 5rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 25% 60%, rgba(99,102,241,0.2) 0%, transparent 55%),
    radial-gradient(ellipse at 75% 30%, rgba(79,70,229,0.12) 0%, transparent 50%);
}
.hero-content { position: relative; z-index: 1; }
.hero h1 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(1.9rem, 5vw, 3rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.2;
}
.hero h1 span { color: #a5b4fc; }
.hero p { color: #94a3b8; font-size: 1rem; margin-bottom: 2rem; }
.hero-btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.75rem 2.2rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(79,70,229,0.45);
  transition: background 0.2s, transform 0.2s;
}
.hero-btn:hover { background: #4338ca; transform: translateY(-2px); }

/* ── PROGRAMMING LANGUAGES STRIP ── */
.lang-strip {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
}
.lang-strip-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.lang-strip-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  white-space: nowrap;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.lang-strip-label i { color: var(--accent); }
.lang-divider {
  width: 1px;
  height: 20px;
  background: var(--border);
  flex-shrink: 0;
}
.lang-pills {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
  align-items: center;
}
.lang-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.32rem 0.85rem;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 700;
  white-space: nowrap;
  text-decoration: none;
  border: 1.5px solid transparent;
  transition: transform 0.15s, box-shadow 0.15s, filter 0.15s;
}
.lang-pill:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  filter: brightness(1.08);
}
.lang-pill .lang-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.6;
  flex-shrink: 0;
}

/* ── TRUST BAR ── */
.trust-bar {
  background: #fff;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  padding: 0.75rem 1.5rem;
  flex-wrap: wrap;
}
.trust-item {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.trust-item i { color: var(--accent); }

/* ── SECTION WRAPPER ── */
.section-wrapper {
  background: var(--bg);
  padding-bottom: 3rem;
}

/* ── SECTION ── */
.section { padding: 2.5rem 1.5rem; max-width: 1200px; margin: 0 auto; width: 100%; }
.section-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.section-title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 1.3em;
  background: var(--accent);
  border-radius: 2px;
  flex-shrink: 0;
}

/* ── GRID ── */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(185px, 1fr));
  gap: 1.2rem;
}

/* ── CARD ── */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s, transform 0.2s;
  box-shadow: var(--shadow-sm);
  border-top: 3px solid var(--accent);
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card-thumb { width: 100%; aspect-ratio: 2/3; object-fit: cover; }

.card-thumb-placeholder {
  width: 100%;
  aspect-ratio: 2/3;
  background: var(--accent-lt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--accent);
  opacity: 0.5;
}

.card-body {
  padding: 0.85rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.card-badge {
  display: inline-block;
  font-size: 0.66rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  background: var(--accent-lt);
  color: var(--accent);
  width: fit-content;
  margin-bottom: 0.1rem;
}

.card-title { font-size: 0.87rem; font-weight: 700; line-height: 1.35; color: var(--text); }
.card-author { font-size: 0.74rem; color: var(--muted); }
.card-price-row { display: flex; align-items: center; gap: 0.5rem; margin-top: auto; padding-top: 0.5rem; }
.card-price { font-size: 1rem; font-weight: 800; color: var(--green); }
.card-mrp { font-size: 0.73rem; color: var(--muted); text-decoration: line-through; }

.card-actions {
  display: flex;
  gap: 0.4rem;
  padding: 0.6rem 0.85rem;
  border-top: 1px solid var(--border);
  background: #fafafa;
}
.card-actions form { flex: 1; margin: 0; }
.btn {
  flex: 1;
  padding: 0.44rem 0;
  border: 1.5px solid transparent;
  border-radius: 7px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, transform 0.15s;
  font-family: 'Inter', sans-serif;
  text-align: center;
}
.btn:hover { transform: translateY(-1px); }
.btn-cart {
  background: #fff;
  color: var(--accent);
  border-color: var(--accent-mid);
}
.btn-cart:hover { background: var(--accent-lt); }
.btn-buy {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-buy:hover { background: #4338ca; }

/* ── FOOTER ── */
footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  text-align: center;
  padding: 2.5rem 1.5rem 1.5rem;
  font-size: 0.83rem;
  border-top: 3px solid var(--accent);
}
.footer-logo {
  font-family: 'Playfair Display', serif;
  font-size: 1.45rem;
  color: #fff;
  margin-bottom: 0.4rem;
}
.footer-logo span { color: #818cf8; }
.footer-tagline { color: #475569; font-size: 0.78rem; margin-bottom: 1.2rem; }
.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}
.footer-links a {
  color: var(--footer-text);
  text-decoration: none;
  font-size: 0.81rem;
  transition: color 0.15s;
}
.footer-links a:hover { color: #fff; }
.footer-copy { color: #334155; font-size: 0.77rem; }
.footer-copy strong { color: #818cf8; }

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  .nav-center { display: none; }
  .hamburger { display: flex; }
  .books-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
  .trust-bar { gap: 1.2rem; }
  .hero { padding: 3.5rem 1.2rem; }
}