/* ==========================================================================
   OSN Prep — Design System
   Prinsip: tipografi berkarakter (bukan Inter+rounded-2xl generik), palet
   hangat (parchment/ink + terracotta/pine), tanpa gradient/glassmorphism,
   ikon garis custom (bukan emoji/Font Awesome), sudut & bayangan yang tenang.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  /* ---- Light (paper) ---- */
  --bg: #F6F1E6;
  --surface: #FFFDF8;
  --surface-2: #EEE6D3;
  --surface-3: #E4D9BF;
  --border: #DCD0B2;
  --border-strong: #C7B98F;
  --ink: #211D16;
  --ink-muted: #6B6152;
  --ink-faint: #948A76;

  --accent: #B8471F;
  --accent-ink: #FFF9F2;
  --accent-soft: #F3DFCB;
  --pine: #2C6E58;
  --pine-soft: #DCEAE1;
  --gold: #A67A22;
  --gold-soft: #F1E3BE;
  --danger: #A32B22;
  --danger-soft: #F4DCD6;

  --shadow-sm: 0 1px 2px rgba(33, 29, 22, 0.08);
  --shadow-md: 0 4px 16px rgba(33, 29, 22, 0.10);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --font-display: 'Fraunces', 'Georgia', serif;
  --font-body: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #14161B;
  --surface: #1B1E25;
  --surface-2: #232732;
  --surface-3: #2C313E;
  --border: #363C4A;
  --border-strong: #454C5D;
  --ink: #EDE8DC;
  --ink-muted: #A6A190;
  --ink-faint: #726C5D;

  --accent: #E08150;
  --accent-ink: #1B1108;
  --accent-soft: #3A2418;
  --pine: #5FB295;
  --pine-soft: #1B2F27;
  --gold: #D8AE58;
  --gold-soft: #332812;
  --danger: #E08277;
  --danger-soft: #3A1E1A;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

body { margin: 0; }

h1, h2, h3, h4, .font-display {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}

code, pre, .font-mono { font-family: var(--font-mono); }

a { color: var(--accent); }

::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--ink-faint); }

/* ---- Wordmark ---- */
.osn-wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--ink);
}
.osn-wordmark .mark-accent { color: var(--accent); }
.osn-wordmark .mark-sub {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-left: 6px;
  align-self: center;
}

/* ---- Surfaces ---- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.panel {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.1s ease;
}
.btn:active { transform: translateY(1px); }
.btn-accent { background: var(--accent); color: var(--accent-ink); }
.btn-accent:hover { background: color-mix(in srgb, var(--accent) 88%, black); }
.btn-outline { background: transparent; border-color: var(--border-strong); color: var(--ink); }
.btn-outline:hover { background: var(--surface-2); }
.btn-ghost { background: transparent; color: var(--ink-muted); }
.btn-ghost:hover { color: var(--ink); background: var(--surface-2); }
.btn-pine { background: var(--pine); color: var(--accent-ink); }
.btn-pine:hover { background: color-mix(in srgb, var(--pine) 85%, black); }
.btn-danger { background: var(--danger); color: var(--accent-ink); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---- Tags / badges ---- */
.tag {
  display: inline-flex;
  align-items: center;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  background: var(--surface-3);
  color: var(--ink-muted);
  border: 1px solid var(--border);
}
.tag-accent { background: var(--accent-soft); color: var(--accent); border-color: transparent; }
.tag-pine { background: var(--pine-soft); color: var(--pine); border-color: transparent; }
.tag-gold { background: var(--gold-soft); color: var(--gold); border-color: transparent; }

/* ---- Nav ---- */
.nav-link {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.55rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink-muted);
  cursor: pointer;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background-color 0.12s ease, color 0.12s ease;
}
.nav-link:hover { background: var(--surface-2); color: var(--ink); }
.nav-link.active {
  background: var(--surface-2);
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 600;
}
.nav-group-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 1rem 0.8rem 0.3rem;
}

/* ---- Inputs ---- */
.input, select.input, textarea.input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.75rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--ink);
}
.input:focus, select.input:focus, textarea.input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.input::placeholder { color: var(--ink-faint); }

/* ---- Icons (inline SVG, stroke-based, consistent 1.5px weight) ---- */
.icon { width: 1.15em; height: 1.15em; stroke: currentColor; fill: none; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }

/* ---- Prose content (lesson bodies) ---- */
.prose-osn { line-height: 1.75; color: var(--ink); }
.prose-osn h3 { font-size: 1.3rem; margin: 1.75rem 0 0.75rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border); }
.prose-osn h4 { font-size: 1.05rem; margin: 1.4rem 0 0.5rem; }
.prose-osn p { margin: 0 0 0.9rem; color: var(--ink-muted); }
.prose-osn strong { color: var(--ink); font-weight: 600; }
.prose-osn code { background: var(--surface-3); padding: 0.1em 0.4em; border-radius: 4px; font-size: 0.88em; color: var(--accent); }
.prose-osn pre { background: #21252B; color: #E3E6EA; padding: 1rem 1.1rem; border-radius: var(--radius-md); overflow-x: auto; font-size: 0.85rem; margin: 0 0 1rem; }
.prose-osn pre code { background: none; color: inherit; padding: 0; }
.prose-osn ul { margin: 0 0 0.9rem; padding-left: 1.3rem; color: var(--ink-muted); }
.prose-osn li { margin-bottom: 0.4rem; }
.prose-osn table { width: 100%; border-collapse: collapse; margin: 0 0 1.2rem; font-size: 0.88rem; }
.prose-osn th, .prose-osn td { border: 1px solid var(--border); padding: 0.5rem 0.7rem; text-align: left; }
.prose-osn th { background: var(--surface-2); font-weight: 600; }
.callout { border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; padding: 0.9rem 1.1rem; margin: 1rem 0; }
.callout-pine { border-left-color: var(--pine); background: var(--pine-soft); }
.callout-gold { border-left-color: var(--gold); background: var(--gold-soft); }

/* ---- Utility ---- */
.animate-in { animation: fadeUp 0.25s ease both; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.skeleton {
  background: linear-gradient(90deg, var(--surface-2) 25%, var(--surface-3) 37%, var(--surface-2) 63%);
  background-size: 400% 100%;
  animation: shimmer 1.4s ease infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer { 0% { background-position: 100% 50%; } 100% { background-position: 0 50%; } }

/* ==========================================================================
   Komponen konten (Materi / Arsip / Beranda)
   ========================================================================== */

.page-eyebrow { font-size: 0.75rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); margin: 0 0 0.4rem; }
.page-title { font-size: 1.9rem; margin: 0 0 0.5rem; }
.page-lede { color: var(--ink-muted); font-size: 1.02rem; line-height: 1.6; margin: 0 0 1.8rem; max-width: 62ch; }

.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 0.9rem; margin-bottom: 1.8rem; }
.stat-tile { padding: 1.1rem 1.2rem; }
.stat-tile .num { font-family: var(--font-display); font-size: 1.7rem; font-weight: 600; line-height: 1; }
.stat-tile .lbl { font-size: 0.78rem; color: var(--ink-muted); margin-top: 0.35rem; }

.grid-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1rem; }
.action-card { padding: 1.3rem; display: flex; flex-direction: column; gap: 0.6rem; cursor: pointer; transition: border-color 0.15s ease, transform 0.15s ease; text-decoration: none; color: inherit; }
.action-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.action-card .ic { width: 2.2rem; height: 2.2rem; border-radius: var(--radius-sm); background: var(--accent-soft); color: var(--accent); display: flex; align-items: center; justify-content: center; }
.action-card h3 { margin: 0; font-size: 1.05rem; }
.action-card p { margin: 0; font-size: 0.85rem; color: var(--ink-muted); line-height: 1.5; }

.group-block { margin-bottom: 0.3rem; }
.group-toggle { display: flex; align-items: center; justify-content: space-between; padding: 0.45rem 0.7rem; border-radius: var(--radius-sm); cursor: pointer; font-size: 0.82rem; font-weight: 600; color: var(--ink-muted); }
.group-toggle:hover { background: var(--surface-2); color: var(--ink); }
.group-topics { padding-left: 0.6rem; overflow: hidden; max-height: 0; transition: max-height 0.2s ease; }
.group-topics.open { max-height: 2000px; }
.topic-link { display: block; padding: 0.4rem 0.7rem; font-size: 0.82rem; color: var(--ink-muted); border-radius: var(--radius-sm); text-decoration: none; border-left: 2px solid transparent; }
.topic-link:hover { background: var(--surface-2); color: var(--ink); }
.topic-link.active { color: var(--accent); border-left-color: var(--accent); background: var(--surface-2); font-weight: 600; }

.topic-header { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; margin-bottom: 0.9rem; }

.filter-bar { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 1.3rem; }
.filter-bar select, .filter-bar input { max-width: 220px; }

.arsip-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.95rem 1.2rem; text-decoration: none; color: inherit; }
.arsip-row + .arsip-row { border-top: 1px solid var(--border); }
.arsip-row:hover { background: var(--surface-2); }
.arsip-row .meta { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.arsip-row .snippet { font-size: 0.85rem; color: var(--ink-muted); margin-top: 0.3rem; max-width: 60ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.status-dot { display: inline-flex; align-items: center; gap: 0.35rem; font-size: 0.72rem; font-weight: 600; }
.status-dot::before { content: ""; width: 7px; height: 7px; border-radius: 999px; background: var(--ink-faint); }
.status-dot.verified { color: var(--pine); }
.status-dot.verified::before { background: var(--pine); }
.status-dot.pending { color: var(--gold); }
.status-dot.pending::before { background: var(--gold); }

.answer-box { border: 1px dashed var(--border-strong); border-radius: var(--radius-md); padding: 1rem 1.1rem; margin-top: 1rem; }
.answer-hidden-note[hidden] { display: none; }
.answer-hidden-note { color: var(--ink-muted); font-size: 0.88rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }

.spinner { width: 1.1em; height: 1.1em; border: 2px solid var(--border-strong); border-top-color: var(--accent); border-radius: 999px; display: inline-block; animation: spin 0.7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.empty-state { text-align: center; padding: 3rem 1rem; color: var(--ink-muted); }
.empty-state .icon { width: 2.2rem; height: 2.2rem; margin-bottom: 0.8rem; opacity: 0.6; }