/* ============================================================
   home.css — Halaman utama (daftar tutorial)
   ============================================================ */
:root {
  color-scheme: dark;
  --bg: #20252e;
  --bg-2: #262c36;
  --surface: #2a303b;
  --surface-2: #333a47;
  --surface-3: #3d4553;
  --ink: #e6edf3;
  --ink-2: #b4becc;
  --ink-3: #8894a6;
  --ink-4: #7d8aa3;
  --blue: #5b9cf6;
  --green: #34d399;
  --amber: #fbbf24;
  --red: #f87171;
  --violet: #a78bfa;
  --rule: rgba(255, 255, 255, 0.10);
  --rule-bold: rgba(255, 255, 255, 0.16);
  --radius: 5px;
  --font-ui: -apple-system, BlinkMacSystemFont, "Plus Jakarta Sans", "Inter", "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --bg-line: rgba(255, 255, 255, 0.05);
  --bg-trace: rgba(91, 156, 246, 0.09);
  --bg-run: rgba(91, 156, 246, 0.30);
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  min-height: 100vh;
  overscroll-behavior-y: contain;
  display: flex;
  flex-direction: column;
  font-size: 17px;
  background: #20252e;
  color: var(--ink);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}
a {
  color: inherit;
}

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 24px;
  background: rgba(18, 21, 27, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--rule);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0.4px;
  font-size: 16px;
}
.brand-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--blue);
  color: #0b0f19;
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 13.5px;
  font-weight: 800;
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 4px;
  font-family: inherit;
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: 0.2px;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid var(--rule-bold);
  background: var(--surface-2);
  color: var(--ink);
  transition: all 0.16s cubic-bezier(0.16, 1, 0.3, 1);
}
.btn:hover {
  background: var(--surface-3);
  border-color: var(--rule-bold);
  transform: translateY(-1px);
}
.btn-primary {
  background: var(--blue);
  border-color: transparent;
  color: #08111f;
}
.btn-primary:hover {
  background: #6aa6ff;
  transform: translateY(-2px);
}

/* ---------- Hero ---------- */
.hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: 64px 24px 20px;
  text-align: center;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  border: 1px solid var(--rule-bold);
  border-radius: 4px;
  background: var(--surface);
  color: var(--ink-3);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(34px, 6vw, 58px);
  line-height: 1.08;
  letter-spacing: -1px;
  font-weight: 800;
}
.hero h1 .grad {
  color: var(--blue);
}
.hero p {
  margin: 0 auto 26px;
  max-width: 620px;
  color: var(--ink-2);
  font-size: 18px;
}
.hero-cta {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 100px;
  flex-wrap: wrap;
  margin-top: 38px;
  color: var(--ink-3);
  font-size: 18px;
}
.hero-stats b {
  color: var(--ink);
  font-size: 50px;
  font-family: var(--mono);
  display: block;
  line-height: 1.2;
}

/* ---------- Filter ---------- */
.filter-wrap {
  position: sticky;
  top: 70px;
  z-index: 30;
  padding: 16px 0;
  background: #20252e;
  margin-bottom: 8px;
}
.filters {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 0 24px;
}
.filter-btn {
  padding: 8px 16px;
  border-radius: 4px;
  border: 1px solid var(--rule);
  background: var(--surface);
  color: var(--ink-3);
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
}
.filter-btn:hover {
  color: var(--ink);
  border-color: var(--rule-bold);
}
.filter-btn.active {
  background: var(--blue);
  border-color: var(--blue);
  color: #08111f;
}

/* ---------- Grid ---------- */
.grid {
  max-width: 1240px;
  margin: 0 auto 72px;
  padding: 0 24px;
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fill, minmax(390px, 1fr));
  align-items: start;
}

/* ---------- Card ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: background 0.18s ease, border-color 0.18s ease;
}
.card:hover {
  background: var(--surface-2);
  border-color: var(--rule-bold);
}
.card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.6px;
  text-transform: uppercase;
}
.badge.uno {
  background: rgba(91, 156, 246, 0.16);
  color: #8bb8ff;
  border: 1px solid rgba(91, 156, 246, 0.35);
}
.badge.nodemcu {
  background: rgba(52, 211, 153, 0.14);
  color: #6ee7b7;
  border: 1px solid rgba(52, 211, 153, 0.35);
}
.level {
  margin-left: auto;
  font-size: 12.5px;
  color: var(--ink-4);
  font-weight: 700;
  letter-spacing: 0.5px;
}
.card h3 {
  margin: 0;
  font-size: 20px;
  line-height: 1.25;
  letter-spacing: -0.2px;
}
.section-label {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--ink-4);
  margin: 0 0 6px;
}
.output-box {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 12px;
  background: rgba(52, 211, 153, 0.07);
  border: 1px solid rgba(52, 211, 153, 0.22);
  border-radius: 4px;
  font-size: 15px;
  color: var(--ink-2);
}
.output-box .oi {
  flex-shrink: 0;
}
.parts {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.part-chip {
  font-size: 13px;
  padding: 3px 9px;
  border-radius: 3px;
  background: var(--surface-2);
  border: 1px solid var(--rule);
  color: var(--ink-2);
  font-family: var(--mono);
}

/* ---------- Connection table ---------- */
.conn-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  font-family: var(--mono);
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow: hidden;
}
.conn-table th {
  text-align: left;
  padding: 7px 10px;
  background: var(--surface-2);
  color: var(--ink-3);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  border-bottom: 1px solid var(--rule);
}
.conn-table td {
  padding: 6px 10px;
  border-bottom: 1px solid var(--rule);
  color: var(--ink-2);
  vertical-align: top;
}
.conn-table tr:last-child td {
  border-bottom: none;
}
.conn-table td.to {
  color: var(--blue);
  font-weight: 600;
}
.conn-table td.pin {
  color: var(--amber);
}

/* ---------- Code ---------- */
.code-block {
  margin: 0;
  padding: 14px 16px;
  background: #1c2129;
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-2);
  white-space: pre;
  tab-size: 2;
}
.hl-kw {
  color: #f43f5e;
  font-weight: 600;
}
.hl-fn {
  color: #38bdf8;
  font-weight: 600;
}
.hl-const {
  color: #c084fc;
}
.hl-var {
  color: var(--ink);
}
.hl-num {
  color: var(--amber);
}
.hl-str {
  color: var(--green);
}
.hl-cm {
  color: var(--ink-4);
  font-style: italic;
}

/* ---------- Explanation ---------- */
.explain {
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--surface-2);
  overflow: hidden;
}
.explain > summary {
  cursor: pointer;
  padding: 9px 12px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-2);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  user-select: none;
}
.explain > summary::-webkit-details-marker {
  display: none;
}
.explain > summary::before {
  content: "▸";
  color: var(--blue);
  transition: transform 0.15s ease;
}
.explain[open] > summary::before {
  transform: rotate(90deg);
}
.explain ul {
  margin: 0;
  padding: 4px 16px 14px 28px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.explain li {
  font-size: 14px;
  color: var(--ink-2);
}
.explain li code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--bg);
  padding: 1px 5px;
  border-radius: 2px;
  color: var(--amber);
}

.card-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 2px;
}
.btn-canvas {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 16px;
  border-radius: 4px;
  background: var(--surface-3);
  border: 1px solid var(--rule-bold);
  color: var(--ink);
  font-family: inherit;
  font-size: 15.5px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.15s ease;
}
.btn-canvas:hover {
  background: var(--blue);
  border-color: var(--blue);
  color: #08111f;
  transform: translateY(-1px);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--rule);
  padding: 28px 24px 40px;
  text-align: center;
  color: var(--ink-4);
  font-size: 13.5px;
}
.site-footer a {
  color: var(--blue);
  text-decoration: none;
  font-weight: 600;
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .grid {
    grid-template-columns: 1fr;
    padding: 0 14px;
  }
  .hero {
    padding: 40px 16px 12px;
  }
  .nav {
    padding: 10px 14px;
  }
  .brand span.brand-label {
    display: none;
  }
  .filter-wrap {
    top: 62px;
  }
  .btn {
    padding: 9px 14px;
    font-size: 14px;
  }
}

/* ---------- Bagian tutorial (default tersembunyi) ---------- */
.tutorial-section {
  scroll-margin-top: 84px;
}
.tutorial-section[hidden] {
  display: none;
}
.card {
  cursor: pointer;
}
.card-hint {
  margin-top: auto;
  text-align: right;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.3px;
  color: var(--ink-4);
}
.card:hover .card-hint {
  color: var(--blue);
}

/* ---------- Popup detail tutorial ---------- */
body.modal-open {
  overflow: hidden;
}
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(18, 22, 29, 0.75);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  animation: mFade 0.18s ease;
}
.modal-overlay[hidden] {
  display: none;
}
@keyframes mFade {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
.modal {
  width: min(780px, 100%);
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--rule-bold);
  border-radius: 5px;
  overflow: hidden;
  box-shadow: 0 30px 80px -20px rgba(0, 0, 0, 0.51);
  animation: mPop 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes mPop {
  from {
    transform: translateY(16px) scale(0.98);
    opacity: 0;
  }
  to {
    transform: none;
    opacity: 1;
  }
}
.modal-head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--rule);
  background: var(--surface-2);
  flex-shrink: 0;
}
.modal-head-text {
  flex: 1;
  min-width: 0;
}
.modal-badges {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.modal-badges .level {
  margin-left: 0;
}
.modal-title {
  margin: 0;
  font-size: 23px;
  line-height: 1.2;
  letter-spacing: -0.3px;
}
.modal-close {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border-radius: 4px;
  border: 1px solid var(--rule-bold);
  background: var(--surface-3);
  color: var(--ink-2);
  font-size: 18px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}
.modal-close:hover {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
}
.modal-body {
  flex: 1;
  min-height: 0;
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.modal-cta {
  display: flex;
}
.modal-cta .btn-canvas {
  width: 100%;
}
.explain-list {
  margin: 0;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.explain-list li {
  font-size: 15px;
  color: var(--ink-2);
  line-height: 1.55;
}
.explain-list li code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--bg);
  padding: 1px 5px;
  border-radius: 2px;
  color: var(--amber);
}

@media (max-width: 640px) {
  .modal-overlay {
    padding: 0;
  }
  .modal {
    width: 100%;
    height: 100dvh;
    max-height: 100dvh;
    border-radius: 0;
    border: none;
  }
  .modal-body {
    padding: 16px;
  }
  .modal-title {
    font-size: 20px;
  }
}

/* ---------- Footer selalu di dasar halaman ---------- */
main {
  flex: 1 0 auto;
}
.nav, .site-footer {
  flex-shrink: 0;
}

/* ---------- Background animasi garis berjalan (CSS, ringan) ---------- */
.bg-flow {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  opacity: 0.75;
}
.bg-flow::before,
.bg-flow::after {
  content: "";
  position: absolute;
  inset: -60%;
  will-change: transform;
}
/* grid teknis yang bergeser perlahan */
.bg-flow::before {
  background-image:
    repeating-linear-gradient(0deg, var(--bg-line) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(90deg, var(--bg-line) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(0deg, var(--bg-trace) 0 1px, transparent 1px 128px),
    repeating-linear-gradient(90deg, var(--bg-trace) 0 1px, transparent 1px 128px);
  animation: bgGridDrift 24s linear infinite;
}
/* garis-garis "berjalan" diagonal */
.bg-flow::after {
  background-image:
    repeating-linear-gradient(90deg, var(--bg-run) 0 30px, transparent 30px 190px),
    repeating-linear-gradient(0deg, var(--bg-run) 0 30px, transparent 30px 190px);
  animation: bgRun 9s linear infinite;
  opacity: 0.55;
}
@keyframes bgGridDrift {
  from { transform: translate3d(0, 0, 0); }
  to   { transform: translate3d(128px, 128px, 0); }
}
@keyframes bgRun {
  from { transform: translate3d(0, 0, 0); }
  to   { transform: translate3d(190px, 190px, 0); }
}
main,
.site-footer {
  position: relative;
  z-index: 1;
}

/* ---------- Aksesibilitas ---------- */
:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  .bg-flow { display: none !important; }
}

/* ============================================================
   TEMA KERTAS (paper) — beranda
   ============================================================ */
[data-theme="paper"] {
  color-scheme: light;
  --bg: #d4c8b2;
  --bg-2: #d9cdb7;
  --surface: #ddd1bb;
  --surface-2: #d5c9b3;
  --surface-3: #cbbfa6;
  --ink: #241f18;
  --ink-2: #3b3428;
  --ink-3: #564d3d;
  --ink-4: #6a5f4d;
  --blue: #2a5f9e;
  --green: #2a6e4f;
  --amber: #8f6508;
  --red: #a03a30;
  --violet: #5f4fb0;
  --rule: rgba(50, 40, 25, 0.20);
  --rule-bold: rgba(50, 40, 25, 0.32);
  --font-ui: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --mono: "Courier New", ui-monospace, SFMono-Regular, Menlo, monospace;
  --bg-line: rgba(50, 40, 25, 0.07);
  --bg-trace: rgba(42, 95, 158, 0.10);
  --bg-run: rgba(42, 95, 158, 0.26);
}
[data-theme="paper"] body {
  background: var(--bg);
  color: var(--ink);
}
[data-theme="paper"] .nav {
  background: rgba(221, 210, 188, 0.92);
}
[data-theme="paper"] .filter-wrap {
  background: var(--bg);
}
[data-theme="paper"] .code-block {
  background: #e8ddc5;
  color: var(--ink-2);
  border-color: var(--rule-bold);
}
[data-theme="paper"] .hl-kw { color: #9e3140; }
[data-theme="paper"] .hl-fn { color: #1b5f96; }
[data-theme="paper"] .hl-const { color: #5f4fb0; }
[data-theme="paper"] .hl-num { color: #856006; }
[data-theme="paper"] .badge.uno {
  background: rgba(42, 95, 158, 0.12);
  color: #2a5f9e;
  border-color: rgba(42, 95, 158, 0.35);
}
[data-theme="paper"] .badge.nodemcu {
  background: rgba(42, 110, 79, 0.12);
  color: #2a6e4f;
  border-color: rgba(42, 110, 79, 0.35);
}
[data-theme="paper"] .modal-overlay {
  background: rgba(50, 40, 25, 0.55);
}
[data-theme="paper"] .btn-primary:hover {
  background: #3d7cba;
}
/* Teks di atas tombol biru tua: pakai warna terang agar terbaca */
[data-theme="paper"] .brand-num,
[data-theme="paper"] .btn-primary,
[data-theme="paper"] .filter-btn.active,
[data-theme="paper"] .btn-canvas:hover {
  color: #f7f0e3;
}
/* Background garis dibuat lebih redup di atas kertas */
[data-theme="paper"] .bg-flow {
  opacity: 0.6;
}