/* Custom CSS — selektor tag, class, id & nilai warna (Materi Sesi 14–15) */

:root {
  --brand-ink: #0b1f33;
  --brand-sea: #1f6f8b;
  --brand-mint: #2a9d8f;
  --brand-sand: #f0b429;
  --brand-cloud: #f4f7fa;
  --brand-muted: #5b6b7a;
  --radius: 14px;
  --shadow: 0 12px 30px rgba(11, 31, 51, 0.12);
}

/* 1) Selektor Tag */
body {
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  color: var(--brand-ink);
  background-color: var(--brand-cloud);
  background-image:
    radial-gradient(circle at 10% 0%, rgba(31, 111, 139, 0.12), transparent 40%),
    radial-gradient(circle at 90% 10%, rgba(42, 157, 143, 0.12), transparent 35%),
    linear-gradient(180deg, #eef3f7 0%, #f7fafc 40%, #eef2f5 100%);
  min-height: 100vh;
}

h1, h2, h3 {
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
}

a {
  color: var(--brand-sea);
}

mark {
  background-color: #ffe08a;
  padding: 0 0.2em;
  border-radius: 4px;
}

/* 2) Selektor Class */
.site-header {
  background: linear-gradient(120deg, var(--brand-ink), #143652 55%, var(--brand-sea));
  color: #ffffff;
  box-shadow: var(--shadow);
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--brand-sand);
  color: var(--brand-ink);
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 0.85rem;
}

.hero-panel {
  border-radius: calc(var(--radius) + 4px);
  overflow: hidden;
  background: #ffffff;
  box-shadow: var(--shadow);
}

.hero-copy {
  padding: 2.5rem;
}

.hero-visual {
  min-height: 280px;
  background: linear-gradient(160deg, #0b1f33, #1f6f8b);
}

.hero-visual img {
  max-height: 320px;
  width: auto;
  object-fit: contain;
}

.code-block {
  background: #0d1117;
  color: #d7e3ee;
  border: 1px solid #30363d;
  border-radius: 10px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.55;
  margin-bottom: 0.75rem;
}

.code-block code {
  color: inherit;
  font-family: Consolas, "Courier New", monospace;
  white-space: pre;
}

.section-card {
  background: #ffffff;
  border: 1px solid #d9e3ec;
  border-radius: var(--radius);
  padding: 1.5rem;
  /* tinggi mengikuti isi; pakai kelas Bootstrap h-100 hanya jika sengaja disamakan */
  box-shadow: 0 8px 18px rgba(11, 31, 51, 0.06);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.section-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.step-badge {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  background: var(--brand-mint);
  color: #ffffff;
  font-weight: 700;
  margin-right: 0.5rem;
}

.table-lab th {
  background-color: var(--brand-ink);
  color: #ffffff;
}

.media-frame {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid #d5e0ea;
  background: #0f2436;
}

.quiz-option {
  cursor: pointer;
  border: 1px solid #c9d6e2;
  border-radius: 10px;
  padding: 0.85rem 1rem;
  margin-bottom: 0.65rem;
  background: #fff;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.quiz-option:hover,
.quiz-option.is-selected {
  border-color: var(--brand-sea);
  background-color: #e8f5f8;
}

.quiz-option.is-correct {
  border-color: #1f8a5b;
  background-color: #e8f8ef;
}

.quiz-option.is-wrong {
  border-color: #c0392b;
  background-color: #fdeceb;
}

.toc-aside {
  background: #ffffff;
  border-left: 4px solid var(--brand-sand);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.sidebar-stack {
  display: flex;
  flex-direction: column;
  gap: 0;
  height: auto;
  align-self: flex-start;
  width: 100%;
}

.site-footer {
  background-color: var(--brand-ink);
  color: #d7e3ee;
  margin-top: 3rem;
}

.fade-up {
  opacity: 0;
  transform: translateY(16px);
  animation: fadeUp 0.7s ease forwards;
}

.fade-up-delay {
  animation-delay: 0.15s;
}

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 3) Selektor ID */
#live-clock {
  font-variant-numeric: tabular-nums;
  color: #b8d7e8;
  font-size: 0.9rem;
}

#form-feedback {
  display: none;
}

#form-feedback.show {
  display: block;
}

#score-board {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--brand-sea);
}

/* Nilai warna: nama, hex, rgb, rgba, hsl (Materi Sesi 15) */
.color-swatch-name { background-color: teal; }
.color-swatch-hex { background-color: #1f6f8b; }
.color-swatch-rgb { background-color: rgb(42, 157, 143); }
.color-swatch-rgba { background-color: rgba(240, 180, 41, 0.85); }
.color-swatch-hsl { background-color: hsl(204, 64%, 12%); color: white; }

.swatch {
  height: 48px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
}

.navbar .nav-link.active {
  color: var(--brand-sand) !important;
  font-weight: 600;
}

@media (max-width: 767.98px) {
  .hero-copy {
    padding: 1.5rem;
  }
}