:root {
  --primary: #111827;
  --secondary: #f3f4f6;
  --accent: #0054a3;
  --accent-dark: #00407c;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --white: #ffffff;
  --radius: 18px;
  --container: 1180px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", sans-serif;
  color: var(--text);
  background: #ffffff;
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
}

button {
  font-family: inherit;
}

.container {
  width: min(100% - 40px, var(--container));
  margin-inline: auto;
}

/* ================= HEADER ================= */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(229, 231, 235, 0.7);
}

.navbar {
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.logo {
  display: inline-flex;
  align-items: center;
}

.logo img {
  width: 120px;
  height: auto;
  display: block;
}

.logo span {
  font-size: 23px;
  font-weight: 800;
  letter-spacing: -1px;
}

.logo small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 8px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 30px;
  margin-left: auto;
}

.nav-menu a {
  color: #4b5563;
  font-size: 14px;
  font-weight: 500;
}

.nav-menu a:hover {
  color: var(--primary);
}

/* ================= BUTTON ================= */

.btn {
  border: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 700;
  transition: 0.2s ease;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
}

.btn-dark {
  background: #fee258;
  color: var(--primary);
}

.btn-dark:hover {
  background: #e6c837;
  transform: translateY(-2px);
}

.btn-outline {
  border: 1px solid var(--border);
  color: var(--primary);
  background: white;
}

.btn-outline:hover {
  border-color: var(--primary);
}

.btn-white {
  background: white;
  color: var(--primary);
}

.btn-white:hover {
  transform: translateY(-2px);
}

.btn-large {
  padding: 15px 23px;
}

/* ================= HERO ================= */

.hero {
  padding: 90px 0 100px;
  background:
    radial-gradient(circle at 80% 20%, rgba(255, 90, 54, 0.1), transparent 30%),
    #fafafa;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 70px;
}

.badge {
  display: inline-flex;
  padding: 7px 12px;
  border-radius: 100px;
  background: #d5e6ff;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 20px;
}

.hero h1 {
  max-width: 680px;
  font-size: clamp(42px, 5vw, 68px);
  line-height: 1.02;
  letter-spacing: -3px;
}

.hero h1 span {
  color: var(--accent);
}

.hero-content > p {
  max-width: 600px;
  margin: 25px 0 30px;
  color: var(--muted);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-trust {
  display: flex;
  gap: 30px;
  margin-top: 45px;
}

.hero-trust div {
  display: flex;
  flex-direction: column;
}

.hero-trust strong {
  font-size: 12px;
}

.hero-trust span {
  color: var(--muted);
  font-size: 10px;
  margin-top: 3px;
}

/* ================= BOOK VISUAL ================= */

.hero-visual {
  min-height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.book span {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 2px;
}

.book strong {
  margin-top: auto;
  font-size: 30px;
  line-height: 1;
}

.book em {
  color: var(--accent);
  font-style: normal;
}

.book small {
  margin-top: 15px;
  font-size: 10px;
}

/* =========================
   HERO BOOK FAN
========================= */

.hero-visual {
  position: relative;
  min-height: 500px;

  display: flex;
  align-items: center;
  justify-content: center;
}

/* Area buku */

.book-fan {
  position: relative;

  width: 360px;
  height: 440px;

  perspective: 1000px;
}

/* Setiap buku */

.fan-book {
  position: absolute;

  left: 50%;
  bottom: 25px;

  width: 245px;
  height: 350px;

  transform-origin: 50% 100%;

  border-radius: 8px;
  overflow: hidden;

  box-shadow: 0 25px 45px rgba(0, 0, 0, 0.16);

  transition:
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 0.5s ease;

  will-change: transform;
}

/* Gambar buku */

.fan-book img {
  width: 100%;
  height: 100%;

  display: block;

  object-fit: contain;
}

/* =========================
   POSISI AWAL
========================= */

.fan-book-back {
  z-index: 1;

  transform: translateX(-50%) rotate(0deg);
}

.fan-book-middle {
  z-index: 2;

  transform: translateX(-50%) rotate(0deg);
}

.fan-book-front {
  z-index: 3;

  transform: translateX(-50%) rotate(0deg);
}

/* =========================
   HOVER FAN EFFECT
========================= */

.book-fan:hover .fan-book-back {
  transform: translateX(-10%) translateX(75px) translateY(0px) rotate(18deg);
}

.book-fan:hover .fan-book-middle {
  transform: translateX(-20%) translateX(0px) translateY(-15px) rotate(0deg);
}

.book-fan:hover .fan-book-front {
  transform: translateX(-50%) translateX(-15px) translateY(-15px) rotate(-18deg);
}

/* =========================
   HOVER SHADOW
========================= */

.book-fan:hover .fan-book-back {
  box-shadow: 8px 18px 24px rgba(0, 0, 0, 0.12);
}

.book-fan:hover .fan-book-middle {
  box-shadow: 6px 20px 28px rgba(0, 0, 0, 0.14);
}

.book-fan:hover .fan-book-front {
  box-shadow: 0 24px 38px rgba(0, 0, 0, 0.18);
}

/* =========================
   HINT
========================= */

.fan-hint {
  position: absolute;

  top: 20px;
  right: 125px;

  max-width: 180px;

  color: #6b7280;

  font-size: 11px;
  line-height: 1.5;

  text-align: center;

  opacity: 0.8;

  transition:
    opacity 0.3s ease,
    transform 0.3s ease;
}

.book-fan:hover + .fan-hint {
  opacity: 0;
  transform: translateY(-5px);
}

/* ================= SECTIONS ================= */

.value-section,
.products-section,
.faq-section {
  padding: 100px 0;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 45px;
}

.section-heading.center {
  display: block;
  max-width: 700px;
  margin: 0 auto 50px;
  text-align: center;
}

.section-heading.center p {
  max-width: 450px;
  margin: 15px auto 0;
  color: var(--muted);
  font-size: 14px;
}

.section-label {
  color: var(--accent);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1.5px;
}

.section-heading h2 {
  margin-top: 8px;
  font-size: clamp(30px, 4vw, 45px);
  line-height: 1.1;
  letter-spacing: -1.5px;
}

.section-heading p {
  max-width: 450px;
  color: var(--muted);
  font-size: 14px;
}

/* ================= VALUE ================= */

.value-section {
  background: white;
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.value-card {
  padding: 30px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.value-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: #f3f4f6;
  font-size: 22px;
  margin-bottom: 22px;
}

.value-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.value-card p {
  color: var(--muted);
  font-size: 14px;
}

/* ================= PRODUCTS ================= */

.products-section {
  background: #f8f8f7;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.product-card {
  position: relative;
  overflow: hidden;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: 0.25s ease;
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.08);
}

.product-card.featured {
  border: 2px solid var(--accent);
}

.product-filter {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin: -20px 0 35px;
}

.filter-btn {
  border: 1px solid var(--border);
  background: #fff;
  color: #6b7280;

  padding: 9px 18px;
  border-radius: 999px;

  font-family: inherit;
  font-size: 12px;
  font-weight: 700;

  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* Pilihan LOPI */

.filter-featured {
  color: #6b4bc1;
  border-color: #dcd0ff;
  background: #faf8ff;
}

.filter-featured:hover {
  border-color: #9b7de8;
  color: #5738a5;
}

.filter-featured.active {
  background: #6f4bd8;
  border-color: #6f4bd8;
  color: #fff;
}

.product-content .badge-jenjang-sd {
  background: #ffe6e6;
  color: #d10000;
}

.product-content .badge-jenjang-smp {
  background: #e7edff;
  color: #1322ff;
}

.product-content .badge-materi {
  background: #e8f7ee;
  color: #16803c;
}

.product-content .badge-latihan {
  background: #fff2dc;
  color: #a85d00;
}

.featured-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 2;

  padding: 6px 10px;
  border-radius: 999px;

  background: #eeeaff;
  color: #5741c8;
  border: 1px solid #dcd4ff;

  font-size: 10px;
  font-weight: 800;

  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
}

.product-image {
  height: 270px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f1f1ef;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.book-cover {
  width: 140px;
  height: 205px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  background: white;
  border-radius: 3px 8px 8px 3px;
  box-shadow: 10px 15px 25px rgba(0, 0, 0, 0.15);
}

.book-cover small {
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 1px;
}

.book-cover h3 {
  margin-top: auto;
  font-size: 25px;
  line-height: 0.95;
}

.book-cover h3 em {
  color: var(--accent);
  font-style: normal;
}

.book-cover span {
  margin-top: 12px;
  font-size: 7px;
  font-weight: 700;
}

.cover-2 {
  background: #e5e7eb;
}

.cover-3 {
  background: #dbeafe;
}

.cover-4 {
  background: #dcfce7;
}

.cover-5 {
  background: #fff7ed;
}

.product-content {
  padding: 24px;
}

.product-meta {
  display: flex;
  gap: 7px;
  margin-bottom: 12px;
}

.badge-jenjang-sd {
  background: #ffe6e6;
  color: #d10000;
}

.badge-jenjang-smp {
  background: #c7d4ff;
  color: #1322ff;
}

.product-meta span {
  padding: 4px 8px;
  border-radius: 5px;
  background: #f3f4f6;
  color: #6b7280;
  font-size: 9px;
  font-weight: 700;
}

.product-content h3 {
  font-size: 18px;
  line-height: 1.3;
}

.product-content p {
  min-height: 66px;
  margin: 10px 0 20px;
  color: var(--muted);
  font-size: 12px;
}

.product-bottom {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 15px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.price {
  display: flex;
  flex-direction: column;
}

.price small {
  color: var(--muted);
  font-size: 9px;
}

.price strong {
  font-size: 17px;
}

/* ================= OTHER BOOKS ================= */

.other-books {
  margin-top: 35px;
  padding: 35px;
  border-radius: var(--radius);
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.other-books .section-label {
  color: #fee258;
}

.other-books h3 {
  margin: 5px 0;
  font-size: 22px;
}

.other-books p {
  color: #9ca3af;
  font-size: 13px;
}

/* ================= CONSULTATION ================= */

.consultation {
  padding: 70px 0;
}

.consultation-box {
  padding: 55px;
  border-radius: 24px;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 50px;
}

.consultation-box .section-label {
  color: #ffe1da;
}

.consultation-box h2 {
  max-width: 650px;
  margin: 8px 0 12px;
  font-size: 35px;
  line-height: 1.1;
}

.consultation-box p {
  max-width: 650px;
  color: #ffe9e4;
  font-size: 14px;
}

/* ================= FAQ ================= */

.faq-container {
  max-width: 800px;
}

.faq-list {
  border-top: 1px solid var(--border);
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-question {
  width: 100%;
  border: 0;
  background: none;
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}

.faq-question span {
  font-size: 22px;
  font-weight: 400;
  transition: 0.2s;
}

.faq-item.active .faq-question span {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-answer p {
  padding-bottom: 22px;
  color: var(--muted);
  font-size: 13px;
}

/* ================= FINAL CTA ================= */

.final-cta {
  padding: 110px 0;
  text-align: center;
  background: #f8f8f7;
}

.final-cta h2 {
  margin: 10px 0 15px;
  font-size: clamp(34px, 5vw, 55px);
  line-height: 1.05;
  letter-spacing: -2px;
}

.final-cta p {
  max-width: 550px;
  margin: auto;
  color: var(--muted);
  font-size: 14px;
}

.final-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 30px;
}

/* ================= FOOTER ================= */

.footer {
  padding: 45px 0;
  background: var(--primary);
  color: white;
}

.footer .logo img {
  width: 115px;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.footer p {
  color: #9ca3af;
  font-size: 12px;
}

.footer small:last-child {
  color: #6b7280;
  font-size: 10px;
}

/* ================= FLOATING WA ================= */

.floating-wa {
  display: none;
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 99;
  width: 55px;
  height: 55px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  background: #25d366;
  color: white;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
  font-size: 20px;
}

.floating-wa span {
  display: none;
}

/* ================= RESPONSIVE ================= */

@media (max-width: 900px) {
  .nav-menu {
    display: none;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .hero-content {
    text-align: center;
  }

  .hero-content > p {
    margin-inline: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-trust {
    justify-content: center;
  }

  .hero-visual {
    min-height: 400px;
  }

  .value-grid {
    grid-template-columns: 1fr;
  }

  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .consultation-box {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 600px) {
  .container {
    width: min(100% - 28px, var(--container));
  }

  .header .nav-cta {
    display: none;
  }

  .navbar {
    height: 65px;
  }

  .hero {
    padding: 60px 0 70px;
  }

  .hero h1 {
    font-size: 42px;
    letter-spacing: -2px;
  }

  .hero-content > p {
    font-size: 15px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-trust {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 30px;
    text-align: left;
  }

  .hero-trust div {
    min-width: 0;
  }

  .hero-trust strong {
    font-size: 10px;
    line-height: 1.3;
  }

  .hero-trust span {
    font-size: 8px;
    line-height: 1.3;
  }

  .hero-visual {
    min-height: 390px;
  }

  .book-fan {
    width: 320px;
    height: 380px;
    transform: translateX(-35px);
  }

  .fan-book {
    width: 210px;
    height: 300px;
  }

  .fan-book-back {
    transform: translateX(-50%) translateX(45px) rotate(9deg);
  }

  .fan-book-middle {
    transform: translateX(-50%) translateX(18px) rotate(4deg);
  }

  .fan-book-front {
    transform: translateX(-50%) translateX(-5px) rotate(-2deg);
  }

  .fan-hint {
    display: none;
  }
  .section-heading {
    display: block;
  }

  .section-heading p {
    margin-top: 15px;
  }

  .value-section,
  .products-section,
  .faq-section {
    padding: 70px 0;
  }

  .product-grid {
    grid-template-columns: 1fr;
  }

  .product-image {
    height: 300px;
  }

  .product-content p {
    min-height: auto;
  }

  .other-books {
    flex-direction: column;
    align-items: flex-start;
    padding: 28px;
  }

  .other-books .btn {
    width: 100%;
  }

  .consultation-box {
    padding: 35px 25px;
  }

  .consultation-box h2 {
    font-size: 28px;
  }

  .final-cta {
    padding: 80px 0;
  }

  .final-actions {
    flex-direction: column;
  }

  .final-actions .btn {
    width: 100%;
  }

  .floating-wa {
    display: flex;
  }
}