/* =========================================================
   Pustaka Informatika — Microsite Berpikir Komputasional
   Sistem Desain: warna, tipografi, layout, komponen
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@500;600&display=swap');

:root {
  --navy: #1B2A4A;
  --navy-deep: #121D34;
  --amber: #F5A623;
  --amber-deep: #D98A0F;
  --teal: #3FB8AF;
  --cream: #F7F5F0;
  --paper: #FFFFFF;
  --ink: #1B2A4A;
  --ink-soft: #51607D;
  --line: #E3DFD4;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius: 14px;
  --shadow: 0 6px 24px rgba(27, 42, 74, 0.10);
  --max-width: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--cream);
  line-height: 1.6;
}

img { max-width: 100%; display: block; }

a { color: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.2;
  margin: 0 0 0.5em;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal);
  font-weight: 600;
}

/* ---------------- Skip link (aksesibilitas) ---------------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--amber);
  color: var(--navy-deep);
  padding: 10px 16px;
  z-index: 1000;
  font-weight: 600;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------------- Header / Navigasi Atas ---------------- */
.site-header {
  background: var(--navy);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--amber);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--navy-deep);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 1rem;
}

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}

.main-nav a {
  display: block;
  text-decoration: none;
  color: rgba(255,255,255,0.82);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 8px;
  transition: background 0.15s, color 0.15s;
}

.main-nav a:hover,
.main-nav a:focus-visible {
  background: rgba(255,255,255,0.10);
  color: #fff;
}

.main-nav a.active {
  background: var(--amber);
  color: var(--navy-deep);
  font-weight: 600;
}

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; align-items: center; gap: 6px; }
  .main-nav {
    display: none;
    width: 100%;
    order: 3;
  }
  .main-nav.open { display: block; }
  .site-header .container { flex-wrap: wrap; }
  .main-nav ul { flex-direction: column; padding-bottom: 12px; }
  .main-nav a { padding: 10px 12px; }
}

/* ---------------- Hero ---------------- */
.hero {
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-deep) 100%);
  color: #fff;
  padding: 56px 0 72px;
}

.hero h1 {
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  color: #fff;
  max-width: 18ch;
}

.hero p {
  max-width: 60ch;
  color: rgba(255,255,255,0.82);
  font-size: 1.05rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-weight: 600;
  padding: 12px 22px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  font-family: var(--font-body);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.btn:hover { transform: translateY(-1px); }

.btn-amber { background: var(--amber); color: var(--navy-deep); }
.btn-amber:hover { background: var(--amber-deep); }

.btn-outline {
  background: transparent;
  border: 1.5px solid rgba(255,255,255,0.5);
  color: #fff;
}
.btn-outline:hover { border-color: #fff; }

.btn-teal { background: var(--teal); color: #06302c; }

/* ---------------- Stepper alur BK (elemen signature) ---------------- */
.bk-stepper {
  margin-top: 44px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
}

.bk-step {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius);
  padding: 18px 16px;
  position: relative;
}

.bk-step .step-num {
  font-family: var(--font-mono);
  color: var(--amber);
  font-size: 0.82rem;
  font-weight: 600;
}

.bk-step h3 {
  color: #fff;
  font-size: 1rem;
  margin: 6px 0 4px;
}

.bk-step p {
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
  margin: 0;
}

@media (max-width: 760px) {
  .bk-stepper { grid-template-columns: 1fr; gap: 10px; }
}

/* ---------------- Sections ---------------- */
.section { padding: 56px 0; }
.section-tight { padding: 32px 0; }
.section-alt { background: var(--paper); }

.section-head { max-width: 65ch; margin-bottom: 32px; }
.section-head h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); }
.section-head p { color: var(--ink-soft); }

/* ---------------- Cards / Grid ---------------- */
.grid {
  display: grid;
  gap: 20px;
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 860px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}

.card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.card .tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: rgba(63,184,175,0.12);
  color: #21786f;
  padding: 3px 9px;
  border-radius: 999px;
  margin-bottom: 10px;
  font-weight: 600;
}

/* ---------------- Tabs (Materi: pilih jurusan) ---------------- */
.tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0;
}

.tab-btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.92rem;
  background: transparent;
  border: none;
  padding: 10px 6px;
  cursor: pointer;
  color: var(--ink-soft);
  border-bottom: 3px solid transparent;
  margin-bottom: -1px;
}

.tab-btn.active,
.tab-btn:hover {
  color: var(--navy);
  border-bottom-color: var(--amber);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---------------- Materi concept cards ---------------- */
.concept {
  border-left: 4px solid var(--teal);
  background: var(--paper);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 18px 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}

.concept .step-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--teal);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.concept h4 { margin: 4px 0 8px; font-size: 1.05rem; }
.concept .example {
  background: var(--cream);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 0.92rem;
  margin-top: 10px;
}
.concept .example strong { color: var(--navy); }

/* ---------------- Video embed ---------------- */
.video-wrap {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  background: #000;
}
.video-wrap iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: 0;
}

/* ---------------- Quiz (Latihan) ---------------- */
.quiz-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 18px;
  box-shadow: var(--shadow);
}

.quiz-question {
  font-weight: 600;
  margin-bottom: 14px;
}

.quiz-options { display: grid; gap: 10px; }

.quiz-option {
  display: block;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  cursor: pointer;
  font-size: 0.94rem;
  transition: border-color 0.15s, background 0.15s;
}

.quiz-option:hover { border-color: var(--teal); }

.quiz-option.correct {
  border-color: #2e9e5b;
  background: rgba(46,158,91,0.10);
  font-weight: 600;
}

.quiz-option.wrong {
  border-color: #c9482f;
  background: rgba(201,72,47,0.08);
}

.quiz-feedback {
  margin-top: 10px;
  font-size: 0.88rem;
  font-weight: 600;
  display: none;
}
.quiz-feedback.show { display: block; }
.quiz-feedback.ok { color: #2e9e5b; }
.quiz-feedback.no { color: #c9482f; }

/* ---------------- Form (Evaluasi) ---------------- */
.form-field { margin-bottom: 18px; }
.form-field label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
}
.form-field input,
.form-field select {
  width: 100%;
  padding: 11px 12px;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: var(--paper);
}
.form-field input:focus,
.form-field select:focus,
.tab-btn:focus-visible,
.btn:focus-visible,
.main-nav a:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

/* ---------------- Score result ---------------- */
.score-box {
  background: var(--navy);
  color: #fff;
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
}
.score-box .score-num {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  color: var(--amber);
}
.score-box p { color: rgba(255,255,255,0.8); }

/* ---------------- Alert ---------------- */
.alert {
  padding: 14px 16px;
  border-radius: 10px;
  font-size: 0.9rem;
  margin-bottom: 20px;
}
.alert-warn { background: #FFF4E0; color: #7A4A00; border: 1px solid #F1D08A; }
.alert-info { background: #E7F6F4; color: #175E56; border: 1px solid #B9E4DF; }

/* ---------------- Daftar file materi (unduh) ---------------- */
.file-list {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
  flex-wrap: wrap;
}

.file-item .file-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.file-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(63,184,175,0.14);
  color: #21786f;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.72rem;
  flex-shrink: 0;
}

.file-name { font-weight: 600; font-size: 0.94rem; }
.file-sub { color: var(--ink-soft); font-size: 0.8rem; }

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

/* ---------------- Upload form (admin) ---------------- */
.upload-box {
  border: 2px dashed var(--line);
  border-radius: var(--radius);
  padding: 24px;
  background: var(--cream);
  text-align: center;
}

.upload-box input[type="file"] {
  margin-top: 10px;
}

.btn-danger {
  background: transparent;
  border: 1.5px solid #c9482f;
  color: #c9482f;
}
.btn-danger:hover { background: rgba(201,72,47,0.08); }

/* ---------------- Tautan Eksternal (Quizizz/Wordwall/Google Form) ---------------- */
.link-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  margin: 20px 0 28px;
}

.link-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--ink);
  transition: transform 0.12s ease;
}
.link-card:hover { transform: translateY(-2px); }

.platform-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 4px 10px;
  border-radius: 999px;
  width: fit-content;
}
.platform-quizizz { background: rgba(238,64,86,0.12); color: #c8203a; }
.platform-wordwall { background: rgba(94,84,224,0.12); color: #4a3fc4; }
.platform-google_form { background: rgba(52,120,246,0.12); color: #2f5fd6; }

.link-card h4 { margin: 0; font-size: 1rem; }
.link-card p { margin: 0; font-size: 0.86rem; color: var(--ink-soft); }
.link-card .link-open { margin-top: auto; font-size: 0.85rem; font-weight: 600; color: var(--teal); }

/* ---------------- Loading state (latihan otomatis) ---------------- */
.loading-box {
  text-align: center;
  padding: 40px 20px;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

/* ---------------- Table (rekap admin) ---------------- */
table.rekap {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  font-size: 0.9rem;
}
table.rekap th, table.rekap td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}
table.rekap th {
  background: var(--navy);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ---------------- Footer ---------------- */
.site-footer {
  background: var(--navy-deep);
  color: rgba(255,255,255,0.65);
  padding: 28px 0;
  font-size: 0.85rem;
  text-align: center;
}
.site-footer a { color: var(--amber); text-decoration: none; }

/* ---------------- Back to top ---------------- */
.back-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  background: var(--amber);
  color: var(--navy-deep);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  box-shadow: 0 6px 16px rgba(0,0,0,0.25);
  font-weight: 700;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}