/* ============================================================
   Spektrum — versi sederhana (HTML + CSS + JS murni)
   Palet lembut kontras rendah: kertas ivory hangat, tinta hijau
   keabu-abuan, aksen sage. Tanpa hitam murni & warna pekat.
   ============================================================ */

:root {
  --bg: #f6f4ef;          /* kertas ivory */
  --surface: #fcfbf7;     /* kartu */
  --ink: #4c5551;         /* teks utama, bukan hitam */
  --ink-strong: #3c4540;  /* judul */
  --muted: #8b948e;       /* teks sekunder */
  --border: #e7e3d9;      /* garis halus */
  --accent: #5f8272;      /* sage */
  --accent-dark: #3e5c4e;
  --accent-soft: #e9f0ec; /* sage sangat muda */
  --amber-soft: #f7f1e1;  /* kutipan */
  --radius: 14px;
  --font-head: Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

::selection { background: #dbe6de; }

a:focus-visible {
  outline: 2px solid #9db8ab;
  outline-offset: 2px;
  border-radius: 4px;
}

.wrap { max-width: 780px; margin: 0 auto; padding: 0 20px; }

/* ---------- Header (sama di semua halaman) ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(246, 244, 239, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
}

.logo {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--ink-strong);
  text-decoration: none;
  display: flex;
  align-items: baseline;
  gap: 10px;
  white-space: nowrap;
}

.logo small {
  font-weight: 400;
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.btn-header {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--accent-dark);
  text-decoration: none;
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 0.87rem;
  white-space: nowrap;
  transition: border-color 0.2s, background 0.2s;
}

.btn-header:hover { border-color: #9db8ab; background: var(--accent-soft); }

/* ---------- Beranda: sapaan pembuka ---------- */
.intro { padding-top: 44px; }

.intro h1 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 2.15rem;
  line-height: 1.2;
  color: var(--ink-strong);
  margin: 0 0 12px;
}

.intro p {
  color: var(--muted);
  max-width: 620px;
  margin: 0;
  font-size: 0.98rem;
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 40px 0 18px;
}

.section-head h2 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.35rem;
  color: var(--ink-strong);
  margin: 0;
}

.section-head span { font-size: 0.85rem; color: var(--muted); }

/* ---------- Kartu pilihan artikel ---------- */
.card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 26px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.card + .card { margin-top: 14px; } /* jarak antar kartu bila pilihan ditambah */

.card:hover {
  border-color: #ccd8cd;
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(60, 69, 64, 0.07);
}

.card-cat {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.74rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
}

.card-dot-meta {
  margin-left: auto;
  letter-spacing: 0;
  text-transform: none;
  font-size: 0.78rem;
}

.card h3 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.3rem;
  line-height: 1.35;
  color: var(--ink-strong);
  margin: 8px 0;
  transition: color 0.2s;
}

.card:hover h3 { color: var(--accent-dark); }

.card-excerpt {
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.65;
  margin: 0;
}

/* Titik warna kategori (ganti sesuai kebutuhan) */
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

.dot-fisika      { background: #7c9c8c; }
.dot-antariksa   { background: #918aab; }
.dot-biologi     { background: #8ba36c; }
.dot-bumi        { background: #b39a6e; }
.dot-teknologi   { background: #7d9dab; }
.dot-kesehatan   { background: #b78d97; }

/* ---------- Panel request artikel ---------- */
.request {
  margin: 46px 0 8px;
  background: var(--accent-soft);
  border: 1px solid #d5e2d9;
  border-radius: var(--radius);
  padding: 34px 30px;
  text-align: center;
}

.request h2 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.3rem;
  color: var(--ink-strong);
  margin: 0 0 8px;
}

.request > p {
  color: var(--ink);
  max-width: 480px;
  margin: 0 auto 20px;
  font-size: 0.95rem;
}

.request .request-mail {
  margin: 16px auto 0;
  font-size: 0.84rem;
  color: var(--muted);
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #f6f4ef;
  border-radius: 999px;
  padding: 11px 28px;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  transition: background 0.2s;
}

.btn:hover { background: #55776a; }

/* ---------- Halaman artikel ---------- */
.back {
  display: inline-block;
  margin: 28px 0 22px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.back:hover { color: var(--accent-dark); }

.article-head { margin-bottom: 10px; }

.article-title {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 2rem;
  line-height: 1.25;
  color: var(--ink-strong);
  margin: 10px 0 14px;
}

.lede {
  color: var(--muted);
  font-size: 1.03rem;
  margin: 0 0 10px;
}

.byline {
  font-size: 0.86rem;
  color: var(--muted);
  margin: 0 0 26px;
}

.byline strong { color: var(--ink); font-weight: 600; }

.article-body { padding-bottom: 10px; }

.article-body p { margin: 0 0 15px; }

.article-body h2 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.45rem;
  line-height: 1.3;
  color: var(--ink-strong);
  margin: 36px 0 12px;
}

.article-body h3 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.14rem;
  color: var(--ink-strong);
  margin: 26px 0 8px;
}

.article-body a { color: var(--accent-dark); }

.article-body img { max-width: 100%; border-radius: 12px; }

.article-body ul,
.article-body ol { margin: 0 0 15px 22px; }

.article-body li { margin-bottom: 6px; }

.article-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 30px 0;
}

/* Kutipan */
.quote {
  background: var(--amber-soft);
  border-radius: 12px;
  padding: 18px 24px;
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-style: italic;
  font-size: 1.02rem;
  color: #6b6250;
}

.quote p { margin: 0; }

.quote cite {
  display: block;
  margin-top: 10px;
  font-style: normal;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 0.84rem;
  color: var(--muted);
}

/* Kotak "Tahukah kamu?" */
.fact {
  background: #edf2ec;
  border-left: 3px solid #9db8ab;
  border-radius: 0 12px 12px 0;
  padding: 14px 20px;
  margin: 0 0 20px;
  font-size: 0.96rem;
}

.fact-title {
  font-weight: 700;
  color: #4e6e5e;
  margin: 0 0 4px;
  font-size: 0.88rem;
  letter-spacing: 0.03em;
}

.fact p { margin: 0; }

/* ---------- Footer ---------- */
.site-footer {
  margin-top: 56px;
  background: #edeee7;
  border-top: 1px solid var(--border);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 22px;
  padding-bottom: 26px;
  font-size: 0.8rem;
  color: var(--muted);
}

.footer-bottom a {
  color: var(--accent-dark);
  text-decoration: none;
}

.footer-bottom a:hover { text-decoration: underline; }

/* ---------- Responsif ---------- */
@media (max-width: 560px) {
  .header-inner { padding: 12px 16px; gap: 10px; }
  .logo { font-size: 1.12rem; }
  .logo small { display: none; }
  .btn-header { padding: 7px 14px; font-size: 0.82rem; }
  .intro { padding-top: 32px; }
  .intro h1 { font-size: 1.62rem; }
  .card { padding: 18px; }
  .card-dot-meta { margin-left: 0; }
  .article-title { font-size: 1.55rem; }
  .request { padding: 26px 20px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}