/* Gaya Linear: hampir hitam, Inter, aksen ungu-biru, border halus, glow lembut. */
:root {
  --bg: #08090a;
  --surface: #0f1011;
  --raised: #141516;
  --line: rgba(255, 255, 255, .08);
  --line-strong: rgba(255, 255, 255, .14);
  --text: #f7f8f8;
  --text-2: #b4bcd0;
  --text-3: #8a8f98;
  --text-4: #62666d;
  --accent: #5e6ad2;
  --accent-hi: #7170ff;
  --green: #4cb782;
  --yellow: #f2c94c;
  --red: #eb5757;
  --font: Inter, -apple-system, "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 15px/1.6 var(--font);
  font-feature-settings: "cv01", "ss03";
  -webkit-font-smoothing: antialiased;
}
.col { max-width: 1024px; margin: 0 auto; padding-left: 16px; padding-right: 16px; }
@media (min-width: 768px) { .col { padding-left: 24px; padding-right: 24px; } }

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; justify-content: space-between; align-items: center;
  height: 64px; padding: 0 16px;
  background: rgba(8, 9, 10, .72);
  backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent; transition: border-color .2s;
}
@media (min-width: 768px) { .nav { padding: 0 24px; } }
.nav.solid { border-bottom-color: var(--line); }
.nav a { color: var(--text-3); text-decoration: none; font-size: 14px; font-weight: 510; transition: color .15s; }
.nav a:hover { color: var(--text); }
.nav .logo { color: var(--text); font-weight: 590; letter-spacing: -.01em; font-size: 15px; }
.nav-links { display: flex; align-items: center; gap: 20px; }

/* Typography */
.eyebrow { margin: 0 0 12px; color: var(--accent-hi); font-size: 13px; font-weight: 510; }
h1, h2 {
  font-weight: 590; letter-spacing: -.022em; margin: 0;
  background: linear-gradient(180deg, #fff 30%, rgba(255, 255, 255, .55));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
h1 { font-size: 44px; line-height: 1.05; margin-bottom: 20px; }
h2 { font-size: 32px; line-height: 1.15; margin-bottom: 28px; }
@media (min-width: 768px) { h1 { font-size: 72px; } h2 { font-size: 44px; } }

/* Hero */
.hero { position: relative; padding: 96px 0 112px; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -40% -10% auto; height: 640px; pointer-events: none;
  background:
    radial-gradient(40% 50% at 50% 50%, rgba(94, 106, 210, .28), transparent 70%),
    radial-gradient(30% 40% at 70% 40%, rgba(113, 112, 255, .14), transparent 70%);
}
.hero .col { position: relative; }
.badge {
  display: inline-flex; align-items: center; gap: 8px; margin-bottom: 28px;
  padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line);
  background: rgba(255, 255, 255, .03); color: var(--text-2); text-decoration: none; font-size: 13px;
}
.badge:hover { border-color: var(--line-strong); color: var(--text); }
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent-hi); box-shadow: 0 0 8px var(--accent-hi); }
.lede { max-width: 540px; margin: 0 0 32px; color: var(--text-3); font-size: 17px; line-height: 1.6; }
.lede em { font-style: normal; color: var(--text); font-weight: 510; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; }

/* Buttons */
.btn, .chip {
  display: inline-flex; align-items: center; justify-content: center; cursor: pointer; text-decoration: none;
  height: 40px; padding: 0 16px; border-radius: 8px;
  border: 1px solid var(--line-strong); background: rgba(255, 255, 255, .04); color: var(--text);
  font: 510 14px var(--font); transition: background .15s, border-color .15s;
}
.btn:hover, .chip:hover { background: rgba(255, 255, 255, .08); }
.btn-primary { background: var(--accent); border-color: transparent; color: #fff; box-shadow: inset 0 1px 0 rgba(255, 255, 255, .2); }
.btn-primary:hover { background: #6872e5; }
.nav a.btn-sm { height: 32px; padding: 0 12px; font-size: 13px; color: var(--text); }
.chip { height: 32px; padding: 0 12px; font-size: 13px; color: var(--text-3); border-color: var(--line); }
.chip.active { color: var(--text); border-color: var(--line-strong); background: rgba(255, 255, 255, .1); }

/* Sections */
.band { padding-top: 80px; padding-bottom: 80px; border-top: 1px solid var(--line); }

.tools { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-bottom: 12px; }
#q {
  flex: 1 1 260px; min-width: 0; height: 40px; padding: 0 14px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--surface); color: var(--text); font: 400 14px var(--font);
  transition: border-color .15s, box-shadow .15s;
}
#q::placeholder { color: var(--text-4); }
#q:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(94, 106, 210, .25); }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.count { color: var(--text-4); font-size: 13px; margin: 0 0 20px; }

/* Kartu kata */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; }
.card {
  padding: 20px; border-radius: 12px; border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, .03), rgba(255, 255, 255, .01)), var(--surface);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .04);
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--line-strong); }
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 16px; }
.word { font-size: 20px; font-weight: 590; letter-spacing: -.012em; margin: 0; }
.tag {
  display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
  font-size: 12px; font-weight: 510; color: var(--text-3);
  padding: 2px 8px; border-radius: 999px; border: 1px solid var(--line);
}
.tag::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--green); }
.tag.awas::before { background: var(--yellow); }
.tag.kasar::before { background: var(--red); }
.side { padding: 10px 12px; margin-top: 8px; border-radius: 8px; background: rgba(255, 255, 255, .025); }
.flag { font-size: 12px; font-weight: 510; color: var(--text-4); }
.side.my .flag::before { content: "MY · "; color: var(--accent-hi); }
.side.id .flag::before { content: "ID · "; color: var(--red); }
.mean { margin: 2px 0 0; font-weight: 510; color: var(--text); }
.ex { margin: 2px 0 0; color: var(--text-3); font-size: 13px; }
.empty { grid-column: 1 / -1; color: var(--text-3); text-align: center; padding: 48px 0; margin: 0; }

/* Kuis */
.quiz-card {
  max-width: 600px; padding: 28px 24px; border-radius: 16px; border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(94, 106, 210, .08), transparent 60%), var(--surface);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .05), 0 24px 48px -24px rgba(0, 0, 0, .6);
}
.quiz-q { font-size: 15px; margin: 0 0 20px; color: var(--text-3); }
.quiz-q b { display: block; margin-top: 6px; font-size: 32px; font-weight: 590; letter-spacing: -.02em; color: var(--text); }
.quiz-opts { display: grid; gap: 8px; }
.opt {
  text-align: left; padding: 12px 14px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--line); background: var(--raised); color: var(--text-2);
  font: 400 14px var(--font); transition: border-color .15s, background .15s;
}
.opt:hover:not(:disabled) { border-color: var(--line-strong); color: var(--text); }
.opt:disabled { cursor: default; opacity: .55; }
.opt.right { opacity: 1; color: var(--text); border-color: var(--green); background: rgba(76, 183, 130, .12); }
.opt.wrong { opacity: 1; color: var(--text); border-color: var(--red); background: rgba(235, 87, 87, .12); }
.quiz-fb { min-height: 1.5em; margin: 20px 0; color: var(--text-2); font-size: 14px; }

footer {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px;
  padding-top: 24px; padding-bottom: 40px; border-top: 1px solid var(--line);
  color: var(--text-4); font-size: 13px;
}