/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
ul { list-style: none; }
input, textarea, select { font: inherit; }

/* ===== CSS VARIABLES ===== */
:root {
  --navy:        #0d1b35;
  --navy-700:    #1a2f52;
  --navy-600:    #1e3a6a;
  --amber:       #f59e0b;
  --amber-600:   #d97706;
  --amber-50:    #fffbeb;
  --bg:          #faf9f7;
  --white:       #ffffff;
  --gray-50:     #f8fafc;
  --gray-100:    #f1f5f9;
  --gray-200:    #e2e8f0;
  --gray-300:    #cbd5e1;
  --gray-400:    #94a3b8;
  --gray-500:    #64748b;
  --gray-600:    #475569;
  --gray-700:    #334155;
  --gray-800:    #1e293b;
  --gray-900:    #0f172a;
  --text:        #1e293b;
  --text-muted:  #64748b;
  --border:      #e2e8f0;

  --shadow-sm:   0 1px 2px rgba(0,0,0,.06);
  --shadow:      0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);
  --shadow-md:   0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -4px rgba(0,0,0,.05);
  --shadow-lg:   0 20px 25px -5px rgba(0,0,0,.10), 0 8px 10px -6px rgba(0,0,0,.05);
  --shadow-book: 5px 8px 20px rgba(0,0,0,.28), 0 2px 6px rgba(0,0,0,.14);

  --r-sm:  6px;
  --r:     10px;
  --r-lg:  16px;
  --r-xl:  24px;

  --t:      0.2s ease;
  --t-slow: 0.35s ease;

  --container: 1200px;
  --nav-h:     68px;
}

/* ===== TYPOGRAPHY ===== */
html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: 'Playfair Display', Georgia, 'Times New Roman', serif;
  line-height: 1.2;
  font-weight: 700;
  color: var(--navy);
}

h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.25rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
h4 { font-size: 1.0625rem; }

p { line-height: 1.75; }

/* ===== LAYOUT UTILITIES ===== */
.container { max-width: var(--container); margin: 0 auto; padding: 0 1.25rem; }

.section     { padding: 5rem 0; }
.section-sm  { padding: 3rem 0; }
.section-alt { background: var(--gray-50); }

.section-header { text-align: center; margin-bottom: 3rem; }
.section-header p {
  color: var(--text-muted); max-width: 560px;
  margin: .75rem auto 0; font-size: 1.0625rem;
}

.section-label {
  display: inline-block; color: var(--amber-600);
  font-size: .75rem; font-weight: 700;
  letter-spacing: .12em; text-transform: uppercase;
  margin-bottom: .5rem;
}

.section-link {
  display: inline-block; font-size: .9375rem; font-weight: 600;
  color: var(--navy); border-bottom: 2px solid var(--amber);
  padding-bottom: 2px; transition: color var(--t);
}
.section-link:hover { color: var(--amber-600); }

/* Fade-in animation */
.fade-in {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .55s ease, transform .55s ease;
}
.fade-in.visible { opacity: 1; transform: none; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .75rem 1.75rem; border-radius: var(--r);
  font-size: .9375rem; font-weight: 600;
  transition: var(--t); cursor: pointer;
  white-space: nowrap; text-decoration: none; border: 2px solid transparent;
}
.btn-primary {
  background: var(--amber); color: var(--navy); border-color: var(--amber);
}
.btn-primary:hover {
  background: var(--amber-600); border-color: var(--amber-600);
  transform: translateY(-1px); box-shadow: 0 4px 14px rgba(245,158,11,.38);
}
.btn-outline {
  background: transparent; color: white; border-color: rgba(255,255,255,.45);
}
.btn-outline:hover {
  background: white; color: var(--navy); border-color: white;
  transform: translateY(-1px);
}
.btn-navy {
  background: var(--navy); color: white; border-color: var(--navy);
}
.btn-navy:hover {
  background: var(--navy-700); border-color: var(--navy-700);
  transform: translateY(-1px); box-shadow: var(--shadow-md);
}
.btn-ghost {
  background: transparent; color: var(--text);
  border-color: var(--border); padding: .6rem 1.25rem;
}
.btn-ghost:hover { background: var(--gray-100); border-color: var(--gray-300); }
.btn-sm { padding: .5rem 1.25rem; font-size: .875rem; }

/* ===== NAVIGATION ===== */
.navbar {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-h);
  display: flex; align-items: center;
  transition: box-shadow var(--t);
}
.navbar.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,.09); }

.navbar__inner {
  display: flex; align-items: center;
  gap: 1.5rem; width: 100%;
}

.navbar__logo {
  display: flex; align-items: center; gap: .625rem;
  font-family: 'Playfair Display', serif;
  font-size: 1.1875rem; font-weight: 700;
  color: var(--navy); flex-shrink: 0;
}
.navbar__logo-icon {
  width: 36px; height: 36px;
  background: var(--amber); border-radius: 8px;
  display: grid; place-items: center;
  color: var(--navy); font-weight: 900;
  font-size: 1.1rem; font-family: 'Playfair Display', serif;
}

.navbar__nav {
  display: none; align-items: center;
  gap: .125rem; margin-left: auto;
}
.navbar__nav a {
  padding: .5rem .9rem; border-radius: var(--r-sm);
  font-size: .9375rem; font-weight: 500; color: var(--gray-700);
  transition: var(--t);
}
.navbar__nav a:hover, .navbar__nav a.active {
  color: var(--navy); background: var(--gray-100);
}

.navbar__cta { display: none; }

.navbar__toggle {
  display: flex; flex-direction: column; gap: 5px;
  padding: .5rem; margin-left: auto; cursor: pointer;
}
.navbar__toggle span {
  display: block; width: 24px; height: 2.5px;
  background: var(--navy); border-radius: 2px;
  transition: transform var(--t), opacity var(--t);
}
.navbar__toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.navbar__toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.navbar__toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

.navbar__mobile {
  position: fixed; top: var(--nav-h); left: 0; right: 0; bottom: 0;
  background: white; padding: 1.25rem 1.5rem;
  display: flex; flex-direction: column; gap: .25rem;
  transform: translateX(100%); transition: transform var(--t-slow);
  z-index: 999; overflow-y: auto;
  border-top: 1px solid var(--border);
}
.navbar__mobile.open { transform: none; }
.navbar__mobile a {
  display: block; padding: .9rem 1rem;
  font-size: 1.0625rem; font-weight: 500; color: var(--text);
  border-radius: var(--r); transition: var(--t);
}
.navbar__mobile a:hover, .navbar__mobile a.active {
  background: var(--gray-100); color: var(--navy);
}
.navbar__mobile .btn {
  width: 100%; justify-content: center;
  margin-top: 1rem; font-size: 1rem;
}

/* ===== HERO ===== */
.hero {
  background: var(--navy);
  background-image:
    radial-gradient(circle at 70% 20%, rgba(30,58,106,.7) 0%, transparent 50%),
    radial-gradient(rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: auto, 28px 28px;
  padding: 5.5rem 0 5rem;
  position: relative; overflow: hidden;
}
.hero::after {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(to right, transparent, rgba(245,158,11,.5), transparent);
}

.hero__inner {
  display: grid; grid-template-columns: 1fr;
  gap: 3rem; align-items: center;
}

.hero__label {
  color: var(--amber); font-size: .8125rem; font-weight: 700;
  letter-spacing: .14em; text-transform: uppercase;
  margin-bottom: .875rem;
  display: flex; align-items: center; gap: .5rem;
}
.hero__label::before {
  content: ''; display: block; width: 28px; height: 2px;
  background: var(--amber); border-radius: 2px;
}

.hero__title {
  font-size: clamp(2.25rem, 6vw, 3.75rem);
  color: white; line-height: 1.1; margin-bottom: 1.375rem;
}
.hero__title span { color: var(--amber); }

.hero__subtitle {
  color: rgba(255,255,255,.7); font-size: 1.0625rem;
  line-height: 1.75; max-width: 500px; margin-bottom: 2rem;
}

.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero__tags {
  display: flex; gap: .5rem; flex-wrap: wrap;
  margin-top: 2.5rem; padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,.1);
}
.hero__tag {
  padding: .375rem .875rem;
  border: 1px solid rgba(255,255,255,.18); border-radius: 999px;
  color: rgba(255,255,255,.6); font-size: .8125rem; font-weight: 500;
  transition: var(--t);
}
.hero__tag:hover { border-color: var(--amber); color: var(--amber); }

/* Hero book mosaic */
.hero__books {
  display: none;
}

/* ===== STATS BAR ===== */
.stats-bar {
  background: white;
  border-bottom: 1px solid var(--border);
  padding: 1.875rem 0;
}
.stats-bar__inner {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem; text-align: center;
}
.stats-bar__item strong {
  display: block; font-size: 2rem; font-weight: 700;
  color: var(--navy); font-family: 'Playfair Display', serif;
  line-height: 1;
}
.stats-bar__item span {
  font-size: .875rem; color: var(--text-muted);
  font-weight: 500; margin-top: .25rem; display: block;
}

/* ===== BOOK CARD ===== */
.book-card {
  background: white; border-radius: var(--r-lg);
  overflow: hidden;
  transition: transform var(--t), box-shadow var(--t);
  box-shadow: var(--shadow);
  display: flex; flex-direction: column;
  text-decoration: none; color: inherit;
}
.book-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.book-card__cover {
  aspect-ratio: 3 / 4; overflow: hidden;
  position: relative; background: var(--gray-100);
}
.book-card__cover img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .45s ease;
}
.book-card:hover .book-card__cover img { transform: scale(1.05); }

.book-card__badge {
  position: absolute; top: .75rem; left: .75rem;
  padding: .25rem .65rem; border-radius: 999px;
  font-size: .6875rem; font-weight: 700;
  letter-spacing: .04em; text-transform: uppercase;
  background: var(--amber); color: var(--navy);
  box-shadow: 0 2px 6px rgba(0,0,0,.2);
}
.book-card__badge--new {
  background: #dbeafe; color: #1e40af;
}

.book-card__body {
  padding: 1.125rem; flex: 1;
  display: flex; flex-direction: column; gap: .25rem;
}
.book-card__cat {
  font-size: .7rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--text-muted);
}
.book-card__title {
  font-family: 'Playfair Display', serif;
  font-size: .9375rem; font-weight: 700;
  color: var(--navy); line-height: 1.35; flex: 1;
}
.book-card__author {
  font-size: .8rem; color: var(--text-muted);
}
.book-card__footer {
  display: flex; align-items: center;
  justify-content: space-between;
  margin-top: .75rem; gap: .5rem;
}
.book-card__rating {
  font-size: .8rem; color: var(--text-muted);
  display: flex; align-items: center; gap: .25rem;
}
.book-card__rating .star { color: var(--amber); }
.book-card__btn {
  padding: .4rem 1rem;
  background: var(--amber); color: var(--navy);
  border-radius: var(--r-sm);
  font-size: .8125rem; font-weight: 600;
  transition: var(--t); flex-shrink: 0;
}
.book-card:hover .book-card__btn { background: var(--amber-600); }

/* ===== CAROUSEL ===== */
.carousel-section { position: relative; }
.carousel-section .section-header {
  display: flex; align-items: flex-end;
  justify-content: space-between; text-align: left;
  flex-wrap: wrap; gap: 1rem; margin-bottom: 2rem;
}

.carousel-wrap { position: relative; }

.carousel {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: calc(47% - .625rem);
  gap: 1.25rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  padding-bottom: .5rem;
  -webkit-overflow-scrolling: touch;
}
.carousel::-webkit-scrollbar { display: none; }
.carousel > * { scroll-snap-align: start; }

.carousel-nav {
  display: none;
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 44px; height: 44px; border-radius: 50%;
  background: white; border: 2px solid var(--border);
  box-shadow: var(--shadow-md);
  align-items: center; justify-content: center;
  font-size: 1.1rem; color: var(--navy);
  transition: var(--t); z-index: 10; cursor: pointer;
}
.carousel-nav:hover { background: var(--navy); color: white; border-color: var(--navy); }
.carousel-nav.prev { left: -22px; }
.carousel-nav.next { right: -22px; }

.carousel-dots {
  display: flex; justify-content: center;
  gap: .5rem; margin-top: 1.5rem;
}
.carousel-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--gray-300); border: none;
  padding: 0; cursor: pointer; transition: var(--t);
}
.carousel-dot.active {
  background: var(--amber); width: 24px; border-radius: 4px;
}

/* ===== CATEGORY CARDS ===== */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.cat-card {
  background: white; border-radius: var(--r-lg);
  padding: 1.375rem 1.25rem;
  border: 1.5px solid var(--border);
  transition: var(--t); display: flex;
  align-items: center; gap: .875rem;
  text-decoration: none; cursor: pointer;
}
.cat-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.cat-card__icon {
  width: 46px; height: 46px; border-radius: var(--r);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.375rem; flex-shrink: 0;
}
.cat-card__name {
  font-family: 'Playfair Display', serif;
  font-weight: 700; font-size: 1rem; color: var(--navy);
}
.cat-card__count {
  font-size: .8125rem; color: var(--text-muted); margin-top: .1rem;
}
.cat-card__arrow {
  margin-left: auto; color: var(--gray-400);
  font-size: 1.125rem; flex-shrink: 0;
  transition: transform var(--t), color var(--t);
}
.cat-card:hover .cat-card__arrow { color: var(--amber); transform: translateX(4px); }

/* ===== COURSE CARD ===== */
.course-card {
  background: white; border-radius: var(--r-lg);
  overflow: hidden; box-shadow: var(--shadow);
  transition: transform var(--t), box-shadow var(--t);
  display: flex; flex-direction: column;
}
.course-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }

.course-card__thumb {
  aspect-ratio: 16 / 9; overflow: hidden;
  position: relative; background: var(--navy);
}
.course-card__thumb img {
  width: 100%; height: 100%; object-fit: cover;
  opacity: .82; transition: transform .45s ease, opacity .3s;
}
.course-card:hover .course-card__thumb img { transform: scale(1.06); opacity: .9; }

.course-card__level {
  position: absolute; top: .75rem; left: .75rem;
  padding: .25rem .65rem; border-radius: 999px;
  font-size: .6875rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .04em;
}
.level-beginner     { background: #d1fae5; color: #065f46; }
.level-intermediate { background: #dbeafe; color: #1e40af; }
.level-advanced     { background: #ede9fe; color: #5b21b6; }

.course-card__play {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: var(--t); background: rgba(13,27,53,.3);
}
.course-card:hover .course-card__play { opacity: 1; }
.course-card__play-btn {
  width: 52px; height: 52px; background: rgba(255,255,255,.95);
  border-radius: 50%; display: flex; align-items: center;
  justify-content: center; color: var(--navy);
  font-size: 1.2rem; padding-left: .2rem;
  box-shadow: 0 4px 16px rgba(0,0,0,.25);
}

.course-card__body {
  padding: 1.25rem; flex: 1; display: flex;
  flex-direction: column;
}
.course-card__cat {
  font-size: .7rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--text-muted); margin-bottom: .375rem;
}
.course-card__title {
  font-family: 'Playfair Display', serif;
  font-weight: 700; font-size: .9375rem;
  color: var(--navy); line-height: 1.35;
  margin-bottom: .5rem;
}
.course-card__desc {
  font-size: .875rem; color: var(--text-muted);
  line-height: 1.65; margin-bottom: 1rem; flex: 1;
}
.course-card__meta {
  display: flex; gap: 1.25rem; font-size: .8125rem;
  color: var(--text-muted); margin-bottom: 1.125rem;
}
.course-card__footer {
  display: flex; align-items: center;
  justify-content: space-between;
}
.course-card__price {
  font-weight: 700; color: var(--navy); font-size: 1.0625rem;
}

/* ===== TESTIMONIALS ===== */
.testimonials { background: var(--navy); }
.testimonials .section-label { color: var(--amber); }
.testimonials .section-header h2 { color: white; }
.testimonials .section-header p { color: rgba(255,255,255,.6); }

.testi-grid { display: grid; gap: 1.25rem; }
.testi-card {
  background: rgba(255,255,255,.055);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--r-lg); padding: 1.75rem;
  transition: border-color var(--t);
}
.testi-card:hover { border-color: rgba(245,158,11,.35); }

.testi-stars { color: var(--amber); letter-spacing: .1em; margin-bottom: .875rem; }
.testi-quote {
  color: rgba(255,255,255,.82); line-height: 1.75;
  font-size: .9375rem; font-style: italic; margin-bottom: 1.375rem;
}
.testi-author { display: flex; align-items: center; gap: .875rem; }
.testi-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--amber); color: var(--navy);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1rem;
  font-family: 'Playfair Display', serif; flex-shrink: 0;
}
.testi-name { font-weight: 600; color: white; font-size: .9375rem; }
.testi-role { font-size: .8125rem; color: rgba(255,255,255,.48); margin-top: .1rem; }

/* ===== NEWSLETTER ===== */
.newsletter {
  background: var(--amber-50);
  border-top: 1px solid rgba(245,158,11,.22);
  border-bottom: 1px solid rgba(245,158,11,.22);
}
.newsletter__inner { text-align: center; max-width: 560px; margin: 0 auto; }
.newsletter__inner h2 { color: var(--navy); margin-bottom: .75rem; }
.newsletter__inner p { color: var(--text-muted); margin-bottom: 2rem; }

.newsletter__form { display: flex; flex-direction: column; gap: .75rem; }
.newsletter__input {
  flex: 1; padding: .875rem 1.25rem;
  border: 2px solid var(--border); border-radius: var(--r);
  font-size: 1rem; background: white; outline: none;
  transition: border-color var(--t), box-shadow var(--t);
}
.newsletter__input:focus {
  border-color: var(--amber);
  box-shadow: 0 0 0 3px rgba(245,158,11,.14);
}
.newsletter__input::placeholder { color: var(--gray-400); }

.newsletter__msg {
  color: var(--amber-600); font-weight: 600;
  font-size: .9375rem; display: none;
}
.newsletter__msg.visible { display: block; }

/* ===== FOOTER ===== */
.footer { background: var(--navy); color: rgba(255,255,255,.65); padding: 4rem 0 2rem; }
.footer__grid { display: grid; gap: 2.5rem; }

.footer__brand .footer-logo {
  display: flex; align-items: center; gap: .625rem;
  font-family: 'Playfair Display', serif;
  font-size: 1.125rem; font-weight: 700; color: white;
  text-decoration: none; margin-bottom: 1rem;
}
.footer__brand p {
  font-size: .9375rem; line-height: 1.7; max-width: 300px;
}

.footer__socials { display: flex; gap: .625rem; margin-top: 1.5rem; }
.footer__social {
  width: 38px; height: 38px;
  background: rgba(255,255,255,.08); border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: .9375rem; color: rgba(255,255,255,.7);
  transition: var(--t); text-decoration: none;
}
.footer__social:hover { background: var(--amber); color: var(--navy); }

.footer__col h4 {
  font-family: 'Inter', sans-serif;
  font-size: .9375rem; font-weight: 600;
  color: white; margin-bottom: 1.125rem;
}
.footer__col ul { display: flex; flex-direction: column; gap: .6rem; }
.footer__col a {
  font-size: .9375rem; color: rgba(255,255,255,.58);
  transition: color var(--t);
}
.footer__col a:hover { color: var(--amber); }

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  margin-top: 3rem; padding-top: 1.5rem;
  display: flex; flex-direction: column; gap: .5rem;
  font-size: .875rem; color: rgba(255,255,255,.42);
}
.footer__bottom a:hover { color: rgba(255,255,255,.75); }

/* ===== BACK TO TOP ===== */
.back-top {
  position: fixed; bottom: 1.5rem; right: 1.5rem; z-index: 500;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--navy); color: white; border: none;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.125rem; box-shadow: var(--shadow-lg);
  cursor: pointer; transition: var(--t);
  opacity: 0; pointer-events: none; transform: translateY(10px);
}
.back-top.visible { opacity: 1; pointer-events: auto; transform: none; }
.back-top:hover { background: var(--amber); color: var(--navy); }

/* ===== PAGE HERO (inner pages) ===== */
.page-hero { background: var(--navy); padding: 3.5rem 0; }
.page-hero h1 { color: white; }
.page-hero p { color: rgba(255,255,255,.65); max-width: 540px; margin-top: .75rem; font-size: 1.0625rem; }
.page-hero__breadcrumb {
  display: flex; align-items: center; gap: .5rem;
  font-size: .875rem; color: rgba(255,255,255,.45); margin-bottom: 1rem;
}
.page-hero__breadcrumb a:hover { color: var(--amber); }
.page-hero__breadcrumb .sep { opacity: .4; }

/* ===== BOOKS PAGE ===== */
.filter-bar {
  background: white; border-bottom: 1px solid var(--border);
  position: sticky; top: var(--nav-h); z-index: 90;
}
.filter-bar__inner {
  display: flex; align-items: center; gap: .5rem;
  padding: .875rem 0; overflow-x: auto;
  scrollbar-width: none;
}
.filter-bar__inner::-webkit-scrollbar { display: none; }

.filter-btn {
  padding: .45rem 1.125rem; border-radius: 999px;
  font-size: .875rem; font-weight: 500; white-space: nowrap;
  border: 1.5px solid var(--border); background: white;
  color: var(--text); transition: var(--t); cursor: pointer;
  flex-shrink: 0;
}
.filter-btn:hover { border-color: var(--navy); color: var(--navy); }
.filter-btn.active { background: var(--navy); border-color: var(--navy); color: white; }

.books-toolbar {
  display: flex; align-items: center;
  justify-content: space-between; margin-bottom: 1.75rem;
  gap: 1rem; flex-wrap: wrap;
}
.books-toolbar__left {
  display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
}
.books-count { color: var(--text-muted); font-size: .9375rem; font-weight: 500; }

.search-wrap { position: relative; }
.search-icon {
  position: absolute; left: .875rem; top: 50%; transform: translateY(-50%);
  color: var(--gray-400); font-size: .875rem; pointer-events: none;
}
.books-search {
  padding: .6rem 1rem .6rem 2.375rem;
  border: 1.5px solid var(--border); border-radius: 999px;
  font-size: .875rem; background: white; outline: none;
  width: 220px; transition: border-color var(--t), box-shadow var(--t);
}
.books-search:focus {
  border-color: var(--amber);
  box-shadow: 0 0 0 3px rgba(245,158,11,.12);
}

.books-sort {
  padding: .56rem .875rem; border: 1.5px solid var(--border);
  border-radius: var(--r-sm); font-size: .875rem;
  background: white; color: var(--text); cursor: pointer;
  outline: none; transition: border-color var(--t);
  appearance: none; -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2364748b' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right .75rem center;
  padding-right: 2.25rem;
}
.books-sort:focus { border-color: var(--amber); }

.books-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}
.books-empty {
  grid-column: 1 / -1; text-align: center;
  padding: 4rem 1rem; color: var(--text-muted);
}
.books-empty h3 { color: var(--navy); margin-bottom: .5rem; }
.books-empty .empty-icon { font-size: 3rem; margin-bottom: 1rem; }

/* ===== BOOK DETAIL ===== */
.book-detail { padding: 3rem 0 4rem; }
.book-detail__inner { display: grid; gap: 2.5rem; }

.book-detail__sticky { position: sticky; top: calc(var(--nav-h) + 1.5rem); }
.book-detail__cover {
  border-radius: var(--r-lg); overflow: hidden;
  box-shadow: var(--shadow-book); max-width: 320px; margin: 0 auto;
}
.book-detail__cover img { width: 100%; display: block; }

.book-detail__buy-box {
  margin-top: 1.5rem; display: flex; flex-direction: column; gap: .75rem;
}
.book-detail__buy-box .btn { width: 100%; justify-content: center; }

.book-detail__category {
  font-size: .75rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .1em;
  color: var(--text-muted); margin-bottom: .375rem;
}
.book-detail__badges { display: flex; gap: .5rem; margin-bottom: .875rem; flex-wrap: wrap; }
.book-detail__badge {
  display: inline-block; padding: .25rem .75rem;
  border-radius: 999px; font-size: .75rem;
  font-weight: 700; letter-spacing: .04em;
}
.badge-bestseller { background: var(--amber-50); color: var(--amber-600); border: 1px solid rgba(245,158,11,.25); }
.badge-new { background: #dbeafe; color: #1e40af; }

.book-detail__title { margin-bottom: .5rem; }
.book-detail__subtitle { color: var(--text-muted); font-size: 1.0625rem; margin-bottom: .625rem; }
.book-detail__author { color: var(--text-muted); font-size: .9375rem; margin-bottom: 1.25rem; }

.book-detail__rating {
  display: flex; align-items: center; gap: .625rem;
  margin-bottom: 1.5rem;
}
.stars-amber { color: var(--amber); font-size: 1.1rem; letter-spacing: .05em; }
.rating-text { font-size: .9375rem; color: var(--text-muted); }
.rating-text strong { color: var(--navy); }

.book-detail__desc {
  font-size: 1.0625rem; color: var(--gray-600);
  line-height: 1.8; margin-bottom: 2rem;
}
.book-detail__highlights { margin-bottom: 2rem; }
.book-detail__highlights h4 {
  font-family: 'Inter', sans-serif; font-size: .9375rem;
  font-weight: 700; color: var(--navy); margin-bottom: 1rem;
  padding-bottom: .625rem; border-bottom: 2px solid var(--border);
}
.book-detail__highlights ul { display: flex; flex-direction: column; gap: .625rem; }
.book-detail__highlights li {
  display: flex; align-items: flex-start; gap: .75rem;
  font-size: .9375rem; color: var(--gray-700); line-height: 1.55;
}
.book-detail__highlights li::before {
  content: '✓'; color: var(--amber-600);
  font-weight: 800; flex-shrink: 0; margin-top: .05rem;
}

.book-detail__actions { display: flex; gap: .875rem; flex-wrap: wrap; }

.related-section { padding: 3rem 0; border-top: 1px solid var(--border); }
.related-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }

/* ===== COURSES PAGE ===== */
.courses-grid { display: grid; gap: 1.25rem; }

/* ===== ABOUT PAGE ===== */
.about-mission {
  padding: 4.5rem 0;
}
.about-mission__grid { display: grid; gap: 2.5rem; align-items: center; }
.about-mission__content p { color: var(--gray-600); line-height: 1.8; margin-bottom: 1rem; font-size: 1.0625rem; }

.about-values { background: var(--gray-50); }
.values-grid { display: grid; gap: 1.25rem; }
.value-card {
  background: white; border-radius: var(--r-lg);
  padding: 1.75rem; border: 1px solid var(--border);
  transition: var(--t);
}
.value-card:hover { border-color: var(--amber); box-shadow: var(--shadow-md); }
.value-card__icon { font-size: 2rem; margin-bottom: 1rem; }
.value-card h4 {
  font-family: 'Inter', sans-serif;
  color: var(--navy); margin-bottom: .5rem; font-weight: 700;
}
.value-card p { font-size: .9375rem; color: var(--text-muted); line-height: 1.65; }

.about-stats { background: var(--navy); padding: 4rem 0; }
.about-stats__grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 2rem; text-align: center;
}
.about-stats__item strong {
  display: block; font-size: 2.5rem; font-weight: 700;
  color: var(--amber); font-family: 'Playfair Display', serif;
}
.about-stats__item span { color: rgba(255,255,255,.65); font-size: .9375rem; font-weight: 500; }

.about-cta { text-align: center; padding: 4rem 0; }
.about-cta h2 { margin-bottom: 1rem; }
.about-cta p { color: var(--text-muted); max-width: 500px; margin: 0 auto 2rem; }
.about-cta__actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ===== CONTACT PAGE ===== */
.contact-page { padding: 4rem 0; }
.contact-grid { display: grid; gap: 2.5rem; }

.contact-info h3 { margin-bottom: 1rem; }
.contact-info > p { color: var(--text-muted); line-height: 1.75; margin-bottom: 2rem; }

.contact-item { display: flex; align-items: flex-start; gap: 1rem; margin-bottom: 1.375rem; }
.contact-icon {
  width: 44px; height: 44px; background: var(--amber-50);
  border: 1px solid rgba(245,158,11,.2);
  border-radius: var(--r); display: flex; align-items: center;
  justify-content: center; font-size: 1.1rem; flex-shrink: 0;
}
.contact-item-text h5 {
  font-family: 'Inter', sans-serif; font-weight: 600;
  color: var(--navy); margin-bottom: .2rem; font-size: .9375rem;
}
.contact-item-text p { color: var(--text-muted); font-size: .9375rem; margin: 0; }
.contact-item-text a { color: var(--amber-600); }
.contact-item-text a:hover { text-decoration: underline; }

.contact-form-wrap {
  background: white; border-radius: var(--r-xl);
  padding: 2rem; box-shadow: var(--shadow-md);
}
.contact-form-wrap h3 { margin-bottom: 1.5rem; }

.form-row { display: grid; gap: 1rem; margin-bottom: 1rem; }
.form-group { display: flex; flex-direction: column; gap: .35rem; }
.form-group label {
  font-size: .875rem; font-weight: 600; color: var(--navy);
}
.form-group input,
.form-group textarea,
.form-group select {
  padding: .75rem 1rem; border: 2px solid var(--border);
  border-radius: var(--r); font-size: .9375rem; outline: none;
  background: var(--gray-50); transition: border-color var(--t), background var(--t);
  color: var(--text);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--amber); background: white;
}
.form-group textarea { min-height: 130px; resize: vertical; }

.form-success { text-align: center; padding: 2rem; display: none; }
.form-success.visible { display: block; }
.form-success__icon { font-size: 3rem; margin-bottom: 1rem; }
.form-success h3 { color: var(--navy); margin-bottom: .5rem; }
.form-success p { color: var(--text-muted); }

/* ===== RESPONSIVE ===== */
@media (min-width: 480px) {
  .books-grid { grid-template-columns: repeat(2, 1fr); }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 640px) {
  .stats-bar__inner { grid-template-columns: repeat(4, 1fr); }
  .about-stats__grid { grid-template-columns: repeat(4, 1fr); }
  .newsletter__form { flex-direction: row; }
  .newsletter__form .btn { flex-shrink: 0; }
  .testi-grid { grid-template-columns: repeat(2, 1fr); }
  .courses-grid { grid-template-columns: repeat(2, 1fr); }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr 1fr; }
  .cat-grid { grid-template-columns: repeat(3, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 1024px) {
  .navbar__nav  { display: flex; }
  .navbar__cta  { display: block; }
  .navbar__toggle { display: none; }

  .hero__inner { grid-template-columns: 1fr auto; gap: 4rem; }
  .hero__books {
    display: grid;
    grid-template-columns: repeat(3, 110px);
    grid-template-rows: repeat(2, 147px);
    gap: .875rem; align-self: center;
  }
  .hero__book-item {
    border-radius: var(--r-sm); overflow: hidden;
    box-shadow: var(--shadow-book);
    transition: transform var(--t);
  }
  .hero__book-item img { width: 100%; height: 100%; object-fit: cover; }
  .hero__book-item--up   { transform: translateY(-14px); }
  .hero__book-item--down { transform: translateY(14px); }
  .hero__book-item:hover { transform: translateY(-6px) scale(1.03) !important; }

  .carousel { grid-auto-columns: calc(25% - .9375rem); }
  .carousel-nav { display: flex; }

  .books-grid { grid-template-columns: repeat(4, 1fr); }
  .related-grid { grid-template-columns: repeat(4, 1fr); }
  .testi-grid { grid-template-columns: repeat(3, 1fr); }
  .courses-grid { grid-template-columns: repeat(3, 1fr); }
  .values-grid { grid-template-columns: repeat(4, 1fr); }
  .cat-grid { grid-template-columns: repeat(4, 1fr); }

  .book-detail__inner { grid-template-columns: 320px 1fr; }
  .contact-grid { grid-template-columns: 1fr 1.55fr; }
  .about-mission__grid { grid-template-columns: 1fr 1fr; }

  .footer__grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
  .footer__bottom { flex-direction: row; justify-content: space-between; }
}

@media (min-width: 1280px) {
  .hero__books {
    grid-template-columns: repeat(3, 130px);
    grid-template-rows: repeat(2, 173px);
    gap: 1rem;
  }
}

/* ===== LEGAL PAGES (privacy-policy.html, terms-of-service.html) ===== */
.legal-page { padding: 4rem 0 5rem; }

.legal-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.legal-toc {
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.5rem;
  height: fit-content;
}

.legal-toc h4 {
  font-size: .8125rem;
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.legal-toc ol {
  list-style: none;
  counter-reset: toc;
  display: flex;
  flex-direction: column;
  gap: .375rem;
}

.legal-toc ol li { counter-increment: toc; }

.legal-toc ol li a {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  font-size: .9rem;
  color: var(--text-muted);
  line-height: 1.4;
  padding: .25rem .375rem;
  border-radius: var(--r-sm);
  transition: color var(--t), background var(--t);
}

.legal-toc ol li a::before {
  content: counter(toc, decimal-leading-zero) ".";
  font-size: .75rem;
  font-weight: 600;
  color: var(--gray-400);
  flex-shrink: 0;
}

.legal-toc ol li a:hover {
  color: var(--navy);
  background: var(--white);
}

.legal-content { min-width: 0; }

.legal-meta {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.legal-meta__badge {
  background: var(--amber-50);
  color: var(--amber-600);
  border: 1px solid #fde68a;
  border-radius: 999px;
  font-size: .8125rem;
  font-weight: 600;
  padding: .25rem .875rem;
}

.legal-meta__date {
  font-size: .875rem;
  color: var(--text-muted);
}

.legal-section { scroll-margin-top: calc(var(--nav-h) + 1.5rem); }

.legal-section + .legal-section { margin-top: 3rem; }

.legal-section h2 {
  font-size: 1.25rem;
  padding-bottom: .75rem;
  border-bottom: 2px solid var(--border);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: .625rem;
}

.legal-section h2 .section-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  background: var(--navy);
  color: var(--white);
  border-radius: 50%;
  font-size: .75rem;
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  flex-shrink: 0;
}

.legal-section p { color: var(--gray-600); margin-bottom: 1rem; }
.legal-section p:last-child { margin-bottom: 0; }

.legal-section h3 {
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin: 1.25rem 0 .5rem;
}

.legal-section ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  margin-bottom: 1rem;
}

.legal-section ul li {
  display: flex;
  gap: .75rem;
  color: var(--gray-600);
  font-size: .9375rem;
  line-height: 1.6;
}

.legal-section ul li::before {
  content: "–";
  color: var(--amber);
  font-weight: 700;
  flex-shrink: 0;
}

.legal-section a { color: var(--navy); font-weight: 500; text-decoration: underline; text-underline-offset: 3px; }
.legal-section a:hover { color: var(--amber-600); }

.legal-notice {
  background: var(--amber-50);
  border-left: 4px solid var(--amber);
  border-radius: 0 var(--r) var(--r) 0;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
}

.legal-notice p { color: var(--gray-700); margin: 0; }

@media (min-width: 1024px) {
  .legal-layout { grid-template-columns: 240px 1fr; gap: 4rem; }
  .legal-toc { position: sticky; top: calc(var(--nav-h) + 1.5rem); }
}