/* ==========================================================================
   1. VARIABEL & PENGATURAN DASAR
   ========================================================================== */

/* Variabel Warna (Palet Tema) */
:root {
  --warna-dasar: #007bff; /* Biru Utama */
  --warna-dasar-gelap: #0056b3; /* Biru Tua (Hover/Aktif) */
  --warna-sekunder: #ffc107; /* Kuning (Aksen) */
  --warna-teks: #333; /* Hitam/Abu Gelap (Teks Utama) */
  --warna-latar: #f4f7f6; /* Abu Sangat Muda (Latar Belakang) */
  --warna-kartu: #ffffff; /* Putih (Kartu Materi) */
  --warna-benar: #28a745; /* Hijau (Jawaban Benar) */
  --warna-salah: #dc3545; /* Merah (Jawaban Salah) */
  --warna-benar-latar: #d4edda; /* Hijau Muda (Latar Feedback Benar) */
  --warna-salah-latar: #f8d7da; /* Merah Muda (Latar Feedback Salah) */
  --bayangan-kartu: 0 4px 12px rgba(0, 0, 0, 0.08); /* Efek Bayangan Halus */

  /* Warna Khusus Hero Banner Beranda */
  --warna-beranda-latar: #d5e8d4;
  --warna-beranda-outline: #b53c3c;
  --warna-beranda-bar: #2d7d6c;
}

/* Reset CSS Sederhana */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Gaya Dasar Body */
body {
  font-family: "Poppins", Arial, sans-serif;
  background-color: var(--warna-latar);
  color: var(--warna-teks);
  line-height: 1.6;
  /* Padding-top diperlukan karena header menggunakan position: fixed */
  padding-top: 70px;
}

/* ==========================================================================
   2. NAVIGASI (HEADER)
   ========================================================================== */

/* Container Navigasi Utama */
.navbar-utama {
  background-color: #ffffff;
  border-bottom: 1px solid #ddd;
  padding: 15px 0;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
  /* Membuat header tetap di atas saat discroll */
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 900;
}

/* Wrapper Konten Navigasi (untuk membatasi lebar) */
.nav-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Logo / Nama Website */
.nav-brand {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--warna-dasar);
  text-decoration: none;
}

/* Area Link Menu */
.nav-links {
  display: flex;
  gap: 15px;
  overflow: visible;
  align-items: center;
}

/* Gaya Link Menu */
.nav-link {
  text-decoration: none;
  color: #555;
  font-weight: 600;
  padding: 8px 10px;
  border-radius: 6px;
  transition: all 0.3s ease;
  font-size: 0.95rem;
  white-space: nowrap;
}

.nav-link:hover {
  background-color: #f0f0f0;
  color: #111;
}

.nav-link.active {
  background-color: var(--warna-dasar);
  color: white;
}

/* --- Dropdown Menu --- */
.nav-dropdown {
  position: relative;
  display: inline-block;
  vertical-align: middle;
}

.nav-dropdown .dropbtn {
  cursor: pointer;
}

/* Konten Dropdown (Tersembunyi by default) */
.nav-dropdown .dropdown-content {
  display: none;
  position: absolute;
  background-color: var(--warna-kartu);
  min-width: 220px;
  box-shadow: var(--bayangan-kartu);
  z-index: 100;
  border-radius: 8px;
  margin-top: 5px;
  border: 1px solid #f0f0f0;
  padding: 4px 0;
}

/* Gaya Link di Dalam Dropdown */
.nav-dropdown .dropdown-content a {
  color: var(--warna-teks);
  padding: 10px 20px;
  text-decoration: none;
  display: block;
  text-align: left;
  font-weight: 500;
  font-size: 0.9rem;
  background-color: transparent;
  white-space: normal;
  transition: all 0.2s ease;
}

.nav-dropdown .dropdown-content a:hover {
  background-color: #e6f7ff;
  color: var(--warna-dasar-gelap);
}

/* Tampilkan Dropdown saat Hover */
.nav-dropdown:hover .dropdown-content {
  display: block;
}

/* Perbaikan Posisi Dropdown Kanan (Quiz & Evaluasi) agar tidak terpotong */
.nav-dropdown:nth-last-child(-n + 2) .dropdown-content {
  right: 0;
  left: auto;
}

/* ==========================================================================
   3. KOMPONEN HALAMAN BERANDA
   ========================================================================== */

/* Hero Section (Banner Atas) */
.beranda-hero {
  background-color: var(--warna-beranda-latar);
  padding: 60px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
  min-height: 450px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 600px;
  margin: 0 auto;
}

.beranda-subtitle-top {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--warna-teks);
}

/* Judul Utama Beranda */
.beranda-title {
  font-family: "Fredoka One", cursive;
  font-size: clamp(3rem, 10vw, 5rem);
  color: white;
  line-height: 1.2;
  margin: 10px 0;
  -webkit-text-stroke: 1px var(--warna-beranda-outline);
  text-stroke: 1px var(--warna-beranda-outline);
  paint-order: stroke fill;
  text-shadow: 3px 3px 0 var(--warna-beranda-outline),
    -3px -3px 0 var(--warna-beranda-outline),
    3px -3px 0 var(--warna-beranda-outline),
    -3px 3px 0 var(--warna-beranda-outline);
}

.beranda-subtitle-bottom {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--warna-teks);
  margin-bottom: 20px;
}

/* Info Kelompok */
.beranda-kelompok {
  margin-bottom: 20px;
}

.beranda-kelompok h3 {
  font-weight: 700;
  color: #333;
}

.beranda-kelompok ul {
  list-style-type: none;
  padding: 0;
  font-size: 1rem;
  color: #444;
}

/* Dekorasi Latar Belakang Beranda */
.dekorasi {
  position: absolute;
  z-index: 1;
  pointer-events: none;
  filter: drop-shadow(2px 2px 3px rgba(0, 0, 0, 0.1));
}

.dekorasi-penggaris-kiri {
  top: 20px;
  left: 20px;
  width: 150px;
  transform: rotate(-45deg);
}

.dekorasi-stapler-kanan {
  top: 20px;
  right: 20px;
  width: 120px;
  transform: rotate(10deg);
}

.dekorasi-siswa {
  bottom: 20px;
  left: 40px;
  width: 150px;
}

.dekorasi-buku {
  bottom: 20px;
  right: 40px;
  width: 130px;
  transform: rotate(-5deg);
}

/* Container Pilihan Materi di Beranda */
.materi-pilihan-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 25px;
}

/* Kartu Pilihan Materi */
.materi-card {
  background: var(--warna-kartu);
  border-radius: 12px;
  box-shadow: var(--bayangan-kartu);
  padding: 25px;
  text-align: center;
  transition: all 0.3s ease;
}

.materi-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.materi-card-icon {
  font-size: 3.5rem;
  margin-bottom: 15px;
}

.materi-card h3 {
  font-size: 1.5rem;
  color: var(--warna-dasar-gelap);
  margin-bottom: 10px;
}

.materi-card p {
  font-size: 1rem;
  color: #444;
  margin-bottom: 20px;
}

.materi-card-btn {
  display: inline-block;
  background-color: var(--warna-dasar);
  color: white;
  text-decoration: none;
  font-weight: 600;
  padding: 12px 30px;
  border-radius: 8px;
  transition: background-color 0.3s ease;
}

.materi-card-btn:hover {
  background-color: var(--warna-dasar-gelap);
}

/* ==========================================================================
   4. KOMPONEN UMUM HALAMAN MATERI
   ========================================================================== */

/* Container Utama */
main.container {
  max-width: 900px;
  margin: 30px auto;
  padding: 0 20px;
}

main.container h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--warna-dasar-gelap);
  text-align: center;
  margin-bottom: 10px;
}

p.deskripsi-pilihan {
  text-align: center;
  font-size: 1.1rem;
  color: #555;
  margin-bottom: 30px;
}

/* Footer */
.footer-utama {
  text-align: center;
  padding: 20px;
  margin-top: 40px;
  background-color: #e9ecef;
  color: #777;
  border-top: 1px solid #ddd;
}

/* Kartu Materi (Card) */
.card {
  background-color: var(--warna-kartu);
  border-radius: 12px;
  padding: 25px;
  margin-bottom: 25px;
  box-shadow: var(--bayangan-kartu);
}

.card h2 {
  color: var(--warna-dasar-gelap);
  margin-bottom: 15px;
  border-bottom: 2px solid var(--warna-sekunder);
  padding-bottom: 5px;
  display: inline-block;
}

.card h3 {
  margin-top: 20px;
  margin-bottom: 10px;
  color: #333;
}

.card p,
.card ul {
  margin-bottom: 15px;
  font-size: 16px;
}

.card ul {
  padding-left: 25px;
}

.card li {
  margin-bottom: 8px;
}

.card ul.tujuan-list li {
  list-style-type: "🎯";
  padding-left: 10px;
}

/* Gambar Ilustrasi Materi */
.materi-gambar {
  width: 100%;
  max-width: 400px;
  height: auto;
  display: block;
  margin: 20px auto;
  background-color: #eee;
  border-radius: 8px;
  border: 2px dashed #ccc;
  text-align: center;
  padding: 40px 20px;
  font-style: italic;
  color: #777;
}

/* Kotak Rumus */
.rumus-box {
  background-color: #e6f7ff;
  border: 2px solid #b3e0ff;
  border-left: 5px solid var(--warna-dasar);
  padding: 20px;
  margin: 20px 0;
  border-radius: 8px;
  font-size: 18px;
  font-weight: 600;
  text-align: center;
  font-family: "Courier New", Courier, monospace;
}

/* Container Video Responsif (16:9) */
.video-container {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  max-width: 100%;
  background: #000;
  margin: 20px 0;
  border-radius: 8px;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* ==========================================================================
   5. LKPD & KUIS INTERAKTIF
   ========================================================================== */

.lkpd h2 {
  color: var(--warna-dasar-gelap);
}

/* Item Soal Kuis */
.quiz-item {
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}

.quiz-item p.soal {
  font-weight: 600;
  font-size: 17px;
  margin-bottom: 15px;
}

/* Pilihan Jawaban (Radio Button) */
.quiz-options input[type="radio"] {
  display: none; /* Sembunyikan radio button asli */
}

.quiz-options {
  list-style-type: none;
  padding: 0;
  margin-bottom: 15px;
}

.quiz-options li {
  margin-bottom: 10px;
}

.quiz-options label {
  display: block;
  padding: 12px;
  border: 1px solid #eee;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.quiz-options label:hover {
  background-color: #f9f9f9;
  border-color: #ccc;
}

/* Style saat opsi dipilih */
.quiz-options input[type="radio"]:checked + label {
  background-color: #e6f7ff;
  border-color: var(--warna-dasar);
  font-weight: 600;
}

/* Tombol Cek Jawaban */
.quiz-btn {
  font-family: "Poppins", sans-serif;
  font-size: 15px;
  font-weight: 600;
  padding: 10px 18px;
  background-color: var(--warna-sekunder);
  color: var(--warna-teks);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.quiz-btn:hover {
  background-color: #e6ac00;
}

/* Kotak Umpan Balik (Feedback) */
.feedback-box {
  display: none;
  margin-top: 15px;
  padding: 12px;
  border-radius: 8px;
  font-weight: 600;
  border: 1px solid;
}

.feedback-box.correct {
  background-color: var(--warna-benar-latar);
  color: var(--warna-benar);
  border-color: var(--warna-benar);
}

.feedback-box.incorrect {
  background-color: var(--warna-salah-latar);
  color: var(--warna-salah);
  border-color: var(--warna-salah);
}

/* Soal Evaluasi (Isian) */
.evaluasi-isian {
  margin-top: 20px;
}

.evaluasi-isian ol {
  padding-left: 20px;
  list-style-position: outside;
}

.evaluasi-isian li {
  margin-bottom: 25px;
  border-bottom: 1px dashed #ddd;
  padding-bottom: 15px;
  list-style: decimal;
}

.evaluasi-isian ul {
  list-style-type: disc;
  margin-left: 25px;
  margin-top: 10px;
}

.evaluasi-isian ol ol {
  margin-left: 20px;
  margin-top: 10px;
}

.evaluasi-isian li p {
  font-size: 16px;
  margin-bottom: 5px;
}

.evaluasi-isian li p strong {
  color: var(--warna-dasar-gelap);
}

/* Gambar dalam Soal */
.soal-gambar {
  width: 100%;
  max-width: 350px;
  height: auto;
  margin: 10px 0;
  border-radius: 8px;
  border: 1px solid #eee;
  background-color: #f9f9f9;
  padding: 10px;
  display: block;
}

hr.pemisah-lkpd {
  margin: 40px 0 30px 0;
  border: none;
  border-top: 2px solid var(--warna-sekunder);
}

/* Skor Total */
.skor-total {
  margin-top: 20px;
  padding: 15px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1.1rem;
  text-align: center;
  background-color: var(--warna-benar-latar);
  color: var(--warna-benar);
  border: 1px solid var(--warna-benar);
}

/* Pembahasan Soal (Dropdown Detail) */
details.contoh-jawaban {
  margin-top: 10px;
  background-color: #f9f9f9;
  border: 1px solid #eee;
  border-radius: 8px;
}
details.contoh-jawaban summary {
  padding: 12px;
  font-weight: 600;
  color: var(--warna-dasar-gelap);
  cursor: pointer;
  border-radius: 8px;
}
details.contoh-jawaban summary:hover {
  background-color: #f0f0f0;
}
details.contoh-jawaban div {
  padding: 15px;
  border-top: 1px solid #eee;
}
details.contoh-jawaban p {
  margin-bottom: 10px;
  font-size: 0.95rem;
}
details.contoh-jawaban p strong {
  color: #333;
}

/* Pecahan Bersusun */
.frac {
  display: inline-block;
  vertical-align: middle;
  margin: 0 0.2em;
  text-align: center;
  font-size: 0.9em;
  line-height: 1.2;
  font-family: inherit;
}

.frac > sup {
  display: block;
  border-bottom: 1.5px solid #333;
  padding: 0 0.1em;
  font-weight: 600;
}

.frac > sub {
  display: block;
  padding: 0.1em 0.1em 0;
  font-weight: 600;
}

/* ==========================================================================
   6. RESPONSIVE DESIGN (MOBILE)
   ========================================================================== */
@media (max-width: 768px) {
  /* Sesuaikan padding body agar tidak tertutup header */
  body {
    padding-top: 100px;
  }

  /* Stack navigasi secara vertikal */
  .nav-container {
    flex-direction: column;
    gap: 10px;
  }
  .nav-links {
    width: 100%;
    justify-content: space-around;
    gap: 5px;
  }
  .nav-link {
    padding: 8px 5px;
    font-size: 0.9rem;
  }

  /* Penyesuaian Hero Banner */
  .beranda-hero {
    padding: 40px 15px;
    min-height: 0;
  }

  /* Sembunyikan dekorasi di mobile */
  .dekorasi {
    display: none;
  }

  /* Ubah grid materi menjadi 1 kolom */
  .materi-pilihan-container {
    grid-template-columns: 1fr;
  }
}