/* Kaliandra — situs informasi & teori */
:root {
  --hijau-tua: #0f2e1f;
  --hijau: #1a4d2e;
  --hijau-muda: #2f7a4d;
  --aksen: #ff6a3d;
  --aksen-2: #ffb020;
  --dingin: #2b8bd6;
  --teks: #1d2a24;
  --teks-2: #4b5b53;
  --garis: #dfe7e2;
  --latar: #f6f8f7;
  --kartu: #ffffff;
  --kode: #eef4f0;
  --lebar: 1120px;
  --rad: 14px;
  --bayang: 0 1px 2px rgba(15, 46, 31, .06), 0 6px 24px rgba(15, 46, 31, .06);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --teks: #e6eee9; --teks-2: #a9bab1; --garis: #2a3a32; --latar: #0c1611;
    --kartu: #13211a; --kode: #1a2b22; --hijau-muda: #5fbf86;
    --bayang: 0 1px 2px rgba(0,0,0,.4), 0 6px 24px rgba(0,0,0,.3);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--latar); color: var(--teks);
  font-family: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 16.5px; line-height: 1.7;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--hijau-muda); text-underline-offset: 3px; }
a:hover { color: var(--aksen); }
h1, h2, h3, h4 { line-height: 1.25; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 4.5vw, 3.1rem); margin: 0 0 .5em; }
h2 { font-size: clamp(1.45rem, 3vw, 1.9rem); margin: 2.2em 0 .6em; }
h3 { font-size: 1.2rem; margin: 1.8em 0 .5em; }
p { margin: 0 0 1em; }
[id] { scroll-margin-top: 84px; }
.wadah { max-width: var(--lebar); margin: 0 auto; padding: 0 20px; }

/* ---------- Header ---------- */
.kepala {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--hijau-tua) 94%, transparent);
  backdrop-filter: blur(8px); color: #fff;
}
.kepala .wadah { display: flex; align-items: center; gap: 18px; height: 64px; }
.merek { display: flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; font-weight: 800; font-size: 1.15rem; }
.merek img { width: 34px; height: 34px; }
.merek small { display: block; font-weight: 500; font-size: .68rem; color: #9fd3b4; letter-spacing: .06em; text-transform: uppercase; margin-top: -4px; }
.menu { display: flex; gap: 4px; margin-left: auto; align-items: center; }
.menu a { color: #d6e9de; text-decoration: none; padding: 8px 12px; border-radius: 8px; font-size: .92rem; font-weight: 600; }
.menu a:hover, .menu a[aria-current="page"] { background: rgba(255,255,255,.1); color: #fff; }
.tombol {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; border-radius: 10px;
  background: var(--aksen); color: #fff !important; text-decoration: none; font-weight: 700; border: 0;
  box-shadow: 0 4px 14px rgba(255,106,61,.35);
}
.tombol:hover { background: #ff5520; }
.tombol--garis { background: transparent; border: 1.5px solid rgba(255,255,255,.5); box-shadow: none; }
.tombol--garis:hover { background: rgba(255,255,255,.1); }
.menu .tombol { padding: 8px 14px; margin-left: 6px; }
.burger { display: none; margin-left: auto; background: none; border: 0; color: #fff; font-size: 1.6rem; cursor: pointer; }
@media (max-width: 900px) {
  .burger { display: block; }
  .menu { display: none; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; align-items: stretch;
          background: var(--hijau-tua); padding: 10px 16px 18px; }
  .menu.buka { display: flex; }
  .menu .tombol { margin: 8px 0 0; justify-content: center; }
}

/* ---------- Hero ---------- */
.hero {
  background: radial-gradient(1200px 500px at 85% -10%, rgba(255,106,61,.35), transparent 60%),
              radial-gradient(900px 500px at 0% 110%, rgba(43,139,214,.25), transparent 60%),
              linear-gradient(160deg, var(--hijau-tua), var(--hijau));
  color: #fff; padding: 84px 0 96px; overflow: hidden;
}
.hero .wadah { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.hero p.lead { font-size: 1.15rem; color: #d7eadf; max-width: 36em; }
.hero .label { display: inline-block; background: rgba(255,255,255,.12); padding: 4px 12px; border-radius: 99px; font-size: .8rem; font-weight: 700; letter-spacing: .05em; margin-bottom: 18px; }
.hero .aksi { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.hero figure { margin: 0; border-radius: 18px; overflow: hidden; box-shadow: 0 20px 60px rgba(0,0,0,.4); border: 1px solid rgba(255,255,255,.15); }
.hero figcaption { font-size: .72rem; color: #b7cfc2; padding: 6px 10px; background: rgba(0,0,0,.35); }
@media (max-width: 900px) { .hero .wadah { grid-template-columns: 1fr; } .hero { padding: 56px 0 64px; } }

.angka-ringkas { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: -48px; position: relative; }
.angka-ringkas div { background: var(--kartu); border-radius: var(--rad); padding: 18px 20px; box-shadow: var(--bayang); border: 1px solid var(--garis); }
.angka-ringkas strong { display: block; font-size: 1.8rem; color: var(--hijau-muda); line-height: 1.1; }
.angka-ringkas span { font-size: .85rem; color: var(--teks-2); }
@media (max-width: 760px) { .angka-ringkas { grid-template-columns: repeat(2, 1fr); } }

/* ---------- Seksi & kartu ---------- */
.seksi { padding: 64px 0; }
.seksi--alt { background: var(--kartu); border-top: 1px solid var(--garis); border-bottom: 1px solid var(--garis); }
.judul-seksi { max-width: 720px; }
.judul-seksi p { color: var(--teks-2); }
.kisi { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.kartu { background: var(--kartu); border: 1px solid var(--garis); border-radius: var(--rad); padding: 22px; box-shadow: var(--bayang); }
.kartu h3 { margin-top: 0; }
.kartu p:last-child { margin-bottom: 0; }
a.kartu { color: inherit; text-decoration: none; display: block; transition: transform .15s, border-color .15s; }
a.kartu:hover { transform: translateY(-3px); border-color: var(--hijau-muda); }
.kartu .ikon { font-size: 1.6rem; margin-bottom: 6px; }
.kartu .lanjut { color: var(--hijau-muda); font-weight: 700; font-size: .9rem; }

/* Alur */
.alur { counter-reset: langkah; display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.alur li { list-style: none; background: var(--kartu); border: 1px solid var(--garis); border-radius: var(--rad); padding: 18px; position: relative; }
.alur li::before { counter-increment: langkah; content: counter(langkah); display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--hijau); color: #fff; font-weight: 800; margin-bottom: 8px; }
.alur { padding: 0; }

/* ---------- Halaman teori ---------- */
.kepala-halaman { background: linear-gradient(160deg, var(--hijau-tua), var(--hijau)); color: #fff; padding: 48px 0 40px; }
.kepala-halaman p { color: #cfe5d8; max-width: 46em; margin: 0; }
.kepala-halaman .remah { font-size: .85rem; color: #9fd3b4; margin-bottom: 10px; }
.kepala-halaman .remah a { color: #9fd3b4; }
.tata-teori { display: grid; grid-template-columns: 240px 1fr; gap: 40px; padding: 40px 20px 72px; }
.daftar-isi { position: sticky; top: 84px; align-self: start; font-size: .9rem; }
.daftar-isi h4 { margin: 0 0 8px; font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--teks-2); }
.daftar-isi ol { margin: 0; padding: 0; list-style: none; border-left: 2px solid var(--garis); }
.daftar-isi a { display: block; padding: 5px 12px; color: var(--teks-2); text-decoration: none; margin-left: -2px; border-left: 2px solid transparent; }
.daftar-isi a:hover { color: var(--hijau-muda); border-left-color: var(--hijau-muda); }
.daftar-isi .lain { margin-top: 22px; }
.isi { min-width: 0; max-width: 780px; }
.isi > h2:first-child { margin-top: 0; }
@media (max-width: 900px) {
  .tata-teori { grid-template-columns: 1fr; gap: 20px; padding-top: 24px; }
  .daftar-isi { position: static; background: var(--kartu); border: 1px solid var(--garis); border-radius: 12px; padding: 12px 14px; }
  .daftar-isi ol { border-left: 0; columns: 2; column-gap: 12px; font-size: .84rem; }
  .daftar-isi a { padding: 3px 0; border-left: 0; }
  .daftar-isi .lain { display: none; }
}

/* Rumus */
.rumus {
  background: var(--kode); border-left: 4px solid var(--hijau-muda); border-radius: 10px;
  padding: 16px 20px; margin: 1em 0 1.3em; overflow-x: auto;
  font-family: "Cambria Math", "STIX Two Math", Cambria, Georgia, serif; font-size: 1.12rem; line-height: 1.9;
}
.rumus .ket { display: block; font-family: inherit; font-size: .82rem; color: var(--teks-2); font-family: "Plus Jakarta Sans", system-ui, sans-serif; line-height: 1.6; margin-top: 6px; }
.var { font-style: italic; }
.frac { display: inline-flex; flex-direction: column; vertical-align: middle; text-align: center; margin: 0 4px; }
.frac > span:first-child { border-bottom: 1.5px solid currentColor; padding: 0 4px; }
.frac > span:last-child { padding: 0 4px; }

/* Tabel */
.tabel { overflow-x: auto; margin: 1em 0 1.5em; border: 1px solid var(--garis); border-radius: 12px; background: var(--kartu); }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--garis); vertical-align: top; }
th { background: var(--kode); font-weight: 700; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
td.n, th.n { text-align: right; font-variant-numeric: tabular-nums; }

/* Catatan */
.catatan { border-radius: 12px; padding: 14px 18px; margin: 1.2em 0; background: #fff6e6; border: 1px solid #ffd99a; color: #5c4210; font-size: .95rem; }
.catatan--info { background: #e9f4ff; border-color: #b6d8f7; color: #173c5e; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .catatan { background: #2e2512; border-color: #6b5320; color: #f3dfb1; }
  :root:not([data-theme="light"]) .catatan--info { background: #13263a; border-color: #2c5378; color: #cfe4f8; }
}
.chip { display: inline-block; padding: 1px 10px; border-radius: 99px; font-size: .8rem; font-weight: 700; color: #fff; }
figure.gambar { margin: 1.4em 0; }
figure.gambar img { border-radius: 12px; border: 1px solid var(--garis); }
figure.gambar figcaption { font-size: .82rem; color: var(--teks-2); margin-top: 6px; }
.dua-kolom { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 700px) { .dua-kolom { grid-template-columns: 1fr; } }
.ref { font-size: .92rem; padding-left: 1.2em; }
.ref li { margin-bottom: .6em; }

/* Navigasi bawah halaman teori */
.nav-bawah { display: flex; justify-content: space-between; gap: 12px; margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--garis); }
.nav-bawah a { text-decoration: none; font-weight: 700; }
.nav-bawah small { display: block; color: var(--teks-2); font-weight: 500; }

/* ---------- CTA & Footer ---------- */
.cta { background: linear-gradient(120deg, var(--hijau), var(--hijau-tua)); color: #fff; border-radius: 20px; padding: 40px; display: flex; gap: 24px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.cta h2 { margin: 0 0 6px; }
.cta p { margin: 0; color: #cfe5d8; }
.kaki { background: var(--hijau-tua); color: #b7cfc2; padding: 44px 0 28px; font-size: .9rem; }
.kaki .wadah { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 28px; }
.kaki h4 { color: #fff; margin: 0 0 10px; font-size: .95rem; }
.kaki a { color: #b7cfc2; text-decoration: none; display: block; padding: 2px 0; }
.kaki a:hover { color: #fff; }
.kaki .hak { grid-column: 1 / -1; border-top: 1px solid rgba(255,255,255,.1); padding-top: 18px; font-size: .8rem; }
@media (max-width: 760px) { .kaki .wadah { grid-template-columns: 1fr; } }