/* ==========================================================================
   TCC Academy — main.css
   PROTOTYPE styling. Desain final akan datang dari DESIGN.md → Google Stitch
   → diselaraskan di Gemini. Semua warna/spacing/radius sudah dalam bentuk
   CSS custom properties supaya gampang di-theming ulang tanpa menyentuh HTML/JS.
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  /* Warna dasar */
  --color-bg: #f6f7fb;
  --color-surface: #ffffff;
  --color-surface-alt: #eef0fa;
  --color-border: #e1e4ee;
  --color-text: #1c1c28;
  --color-text-muted: #656b7a;
  --color-text-faint: #9297a6;

  /* Warna aksen (brand) */
  --color-primary: #4f46e5;      /* indigo — aksi utama */
  --color-primary-dark: #4338ca;
  --color-primary-light: #eef0ff;
  --color-accent: #0ea5b7;       /* teal/cyan — sorotan sekunder */
  --color-accent-light: #e3f7f9;

  /* Warna status */
  --color-success: #16a34a;
  --color-success-light: #e7f8ee;
  --color-danger: #dc2626;
  --color-danger-light: #fdecec;
  --color-warning: #d97706;
  --color-warning-light: #fdf3e2;
  --color-muted-badge: #9297a6;

  /* Tipografi */
  --font-display: "Plus Jakarta Sans", "Segoe UI", system-ui, sans-serif;
  --font-body: "Plus Jakarta Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.375rem;
  --fs-xl: 1.75rem;
  --fs-2xl: 2.25rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;

  /* Radius & shadow */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-pill: 999px;
  --shadow-sm: 0 1px 2px rgba(28, 28, 40, 0.06);
  --shadow-md: 0 6px 20px rgba(28, 28, 40, 0.08);
  --shadow-lg: 0 12px 32px rgba(28, 28, 40, 0.12);

  /* Layout */
  --nav-height-top: 64px;
  --nav-height-bottom: 64px;
  --content-max-width: 1080px;
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

@media (prefers-color-scheme: dark) {
  /* Dark mode opsional — token disiapkan, belum diaktifkan penuh di prototype */
}

/* ---------- Reset dasar ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  padding-bottom: calc(var(--nav-height-bottom) + var(--space-4));
}
@media (min-width: 768px) {
  body { padding-bottom: var(--space-6); padding-top: var(--nav-height-top); }
}
h1, h2, h3, h4, h5 { font-family: var(--font-display); line-height: 1.25; margin: 0 0 var(--space-3); }
h1 { font-size: var(--fs-2xl); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
p { line-height: 1.7; margin: 0 0 var(--space-4); color: var(--color-text); }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { line-height: 1.7; }
img, svg { max-width: 100%; display: block; }
code, pre { font-family: var(--font-mono); }
button { font-family: inherit; }

/* Fokus visible untuk aksesibilitas */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---------- Layout util ---------- */
.container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}
.page-section { padding: var(--space-6) 0; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
/* Desktop — margin removed */
@media (max-width: 1024px) {
  .path-content {
    margin: 0 20px;
  }
}
.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--color-primary);
  color: #fff; padding: var(--space-2) var(--space-4); z-index: 200; border-radius: var(--radius-sm);
}
.skip-link:focus { left: var(--space-4); top: var(--space-4); }

/* ---------- Navigasi atas (desktop) ---------- */
.top-nav {
  display: none;
}
@media (min-width: 768px) {
  .top-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: fixed;
    inset: 0 0 auto 0;
    height: var(--nav-height-top);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    padding: 0 var(--space-6);
  }
  .top-nav .brand {
    display: flex; align-items: center; gap: var(--space-2);
    font-family: var(--font-display); font-weight: 700; font-size: var(--fs-md);
    color: var(--color-text);
  }
  .top-nav .brand:hover { text-decoration: none; }
  .top-nav__links { display: flex; gap: var(--space-2); list-style: none; margin: 0; padding: 0; }
  .top-nav__links a {
    display: flex; align-items: center; gap: var(--space-2);
    padding: var(--space-2) var(--space-4); border-radius: var(--radius-pill);
    color: var(--color-text-muted); font-weight: 600; font-size: var(--fs-sm);
    transition: background var(--transition-fast), color var(--transition-fast);
  }
  .top-nav__links a:hover { background: var(--color-surface-alt); text-decoration: none; }
  .top-nav__links a[aria-current="page"] { background: var(--color-primary-light); color: var(--color-primary); }
}

/* ---------- Navigasi bawah (mobile) ---------- */
.bottom-nav {
  position: fixed; left: 0; right: 0; bottom: 0;
  display: flex; justify-content: space-around;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  height: var(--nav-height-bottom);
  z-index: 100;
  box-shadow: 0 -4px 16px rgba(28,28,40,0.05);
}
@media (min-width: 768px) { .bottom-nav { display: none; } }
.bottom-nav a {
  flex: 1;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 2px; color: var(--color-text-faint); font-size: var(--fs-xs); font-weight: 600;
  padding: var(--space-1) 0;
}
.bottom-nav a:hover { text-decoration: none; }
.bottom-nav a .icon { font-size: 1.25rem; line-height: 1; }
.bottom-nav a[aria-current="page"] { color: var(--color-primary); }

/* ---------- Tombol ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-weight: 700; font-size: var(--fs-sm);
  cursor: pointer;
  transition: transform var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--color-primary); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--color-primary-dark); }
.btn-accent { background: var(--color-accent); color: #fff; }
.btn-accent:hover { filter: brightness(0.93); }
.btn-secondary { background: var(--color-surface-alt); color: var(--color-text); }
.btn-secondary:hover { background: var(--color-border); }
.btn-outline { background: transparent; border-color: var(--color-border); color: var(--color-text); }
.btn-outline:hover { background: var(--color-surface-alt); }
.btn-sm { padding: var(--space-2) var(--space-4); font-size: var(--fs-xs); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  border: 1px solid var(--color-border); background: var(--color-surface); cursor: pointer;
}

/* ---------- Kartu ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
}
.card-hover { transition: box-shadow var(--transition-base), transform var(--transition-base); }
.card-hover:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

/* ---------- Badge / status ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border-radius: var(--radius-pill);
  font-size: var(--fs-xs); font-weight: 700;
}
.badge-locked { background: #eceef3; color: var(--color-muted-badge); }
.badge-active { background: var(--color-primary-light); color: var(--color-primary); }
.badge-done { background: var(--color-success-light); color: var(--color-success); }
.badge-soon { background: var(--color-warning-light); color: var(--color-warning); }

/* ---------- Hero ---------- */
.hero {
  padding: var(--space-8) 0 var(--space-6);
  text-align: center;
}
.hero .eyebrow {
  display: inline-block; font-size: var(--fs-xs); font-weight: 700; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--color-accent); margin-bottom: var(--space-3);
}
.hero h1 { font-size: var(--fs-2xl); max-width: 20ch; margin: 0 auto var(--space-3); }
.hero p.lead { max-width: 46ch; margin: 0 auto var(--space-5); color: var(--color-text-muted); font-size: var(--fs-md); }
.hero .hero-actions { display: flex; gap: var(--space-3); justify-content: center; flex-wrap: wrap; }

/* ---------- Grid util ---------- */
.grid { display: grid; gap: var(--space-5); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

/* ---------- Course / module cards ---------- */
.course-card h3 { margin-bottom: var(--space-2); }
.course-card p { color: var(--color-text-muted); font-size: var(--fs-sm); }
.module-list { list-style: none; margin: var(--space-4) 0 0; padding: 0; display: flex; flex-direction: column; gap: var(--space-2); }
.module-item {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  background: var(--color-surface);
}
.module-item.is-locked { opacity: 0.65; }
.module-item__title { font-weight: 600; font-size: var(--fs-sm); }
.module-item__meta { display: flex; align-items: center; gap: var(--space-3); }

/* ---------- Lab tabs ---------- */
.tab-list { display: flex; gap: var(--space-2); border-bottom: 1px solid var(--color-border); margin-bottom: var(--space-5); flex-wrap: wrap; }
.tab-list button {
  background: none; border: none; padding: var(--space-3) var(--space-4);
  font-weight: 700; font-size: var(--fs-sm); color: var(--color-text-muted); cursor: pointer;
  border-bottom: 3px solid transparent; margin-bottom: -1px;
}
.tab-list button[aria-selected="true"] { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.tab-panel { display: none; }
.tab-panel.is-active { display: block; }

/* ---------- Lab layout ---------- */
.lab {
  display: grid; gap: var(--space-4);
  grid-template-columns: 1fr;
}
@media (min-width: 900px) {
  .lab.lab-split { grid-template-columns: 1fr 1fr; }
}
.lab-toolbar { display: flex; gap: var(--space-2); flex-wrap: wrap; margin-bottom: var(--space-3); align-items: center; }
.lab-pane { display: flex; flex-direction: column; gap: var(--space-2); min-width: 0; }
.lab-pane__label { font-size: var(--fs-xs); font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; color: var(--color-text-faint); }
.editor-shell {
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  overflow: hidden; background: #1e1e2e;
}
.editor-shell .cm-editor { height: 320px; font-family: var(--font-mono); font-size: 13px; }
.preview-shell {
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  overflow: hidden; background: #fff;
}
.preview-shell iframe { width: 100%; height: 320px; border: 0; display: block; background: #fff; }
.output-shell {
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  background: #16161f; color: #d8d8e6; font-family: var(--font-mono); font-size: 13px;
  padding: var(--space-3); height: 320px; overflow-y: auto; white-space: pre-wrap;
}
.output-shell .out-line-stdout { color: #7ee787; }
.output-shell .out-line-stderr { color: #ff7b72; }
.output-shell .out-line-info { color: #8b8fa3; }
.output-input-row { display: flex; gap: var(--space-2); margin-top: var(--space-2); }
.output-input-row input {
  flex: 1; padding: var(--space-2) var(--space-3); border-radius: var(--radius-sm);
  border: 1px solid var(--color-border); font-family: var(--font-mono); font-size: 13px;
}

/* mobile tab toggler for split labs */
.lab-mobile-toggle { display: flex; gap: var(--space-2); margin-bottom: var(--space-3); }
@media (min-width: 900px) { .lab-mobile-toggle { display: none; } }
.lab-mobile-toggle button {
  flex: 1; padding: var(--space-2); border-radius: var(--radius-pill);
  border: 1px solid var(--color-border); background: var(--color-surface); font-weight: 700; font-size: var(--fs-xs);
}
.lab-mobile-toggle button[aria-pressed="true"] { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
@media (max-width: 899px) {
  .lab-split .lab-pane[data-pane="preview"],
  .lab-split .lab-pane[data-pane="output"],
  .lab-split .lab-pane[data-pane="code"] { display: none; }
  .lab-split .lab-pane.is-visible { display: flex; }
}

/* ---------- Checkpoint card ---------- */
.checkpoint-card { margin-top: var(--space-6); border: 2px solid var(--color-primary-light); }
.checkpoint-card h2 { display: flex; align-items: center; gap: var(--space-2); }
.task-list { list-style: none; margin: var(--space-4) 0; padding: 0; display: flex; flex-direction: column; gap: var(--space-2); }
.task-item {
  display: flex; align-items: flex-start; gap: var(--space-3);
  padding: var(--space-3); border-radius: var(--radius-md); background: var(--color-surface-alt);
}
.task-item__icon { font-size: 1.1rem; line-height: 1.4; }
.task-item__body { flex: 1; }
.task-item__hint { font-size: var(--fs-xs); color: var(--color-text-muted); margin-top: 2px; }
.task-item.is-pass { background: var(--color-success-light); }
.task-item.is-fail { background: var(--color-danger-light); }

/* ---------- Lesson content ---------- */
.lesson-content { font-size: var(--fs-base); }
.lesson-content h2 { margin-top: var(--space-6); }
.lesson-content pre {
  background: #1e1e2e; color: #e6e6f0; padding: var(--space-4); border-radius: var(--radius-md);
  overflow-x: auto; font-size: 13px;
}
.lesson-content :not(pre) > code {
  background: var(--color-surface-alt); padding: 2px 6px; border-radius: 4px; font-size: 0.9em;
}
.lesson-meta { display: flex; gap: var(--space-3); align-items: center; color: var(--color-text-muted); font-size: var(--fs-sm); margin-bottom: var(--space-5); }
.inline-lab-wrap { margin: var(--space-5) 0; }
.inline-lab-wrap .lab-toolbar { margin-bottom: var(--space-2); }

/* ---------- Placeholder Fase 2 ---------- */
.placeholder-page { text-align: center; padding: var(--space-8) var(--space-4); }
.placeholder-page .emoji { font-size: 3.5rem; margin-bottom: var(--space-4); }

/* ---------- 404 ---------- */
.error-page { text-align: center; padding: var(--space-8) var(--space-4); }
.error-page .emoji { font-size: 4rem; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border); padding: var(--space-6) 0; margin-top: var(--space-7);
  color: var(--color-text-faint); font-size: var(--fs-sm); text-align: center;
}

/* ---------- Path pages ---------- */
.path-card { display: flex; flex-direction: column; gap: var(--space-2); }
.path-card .icon { font-size: 2rem; }
.roadmap { list-style: none; margin: var(--space-5) 0 0; padding: 0; position: relative; }
.roadmap li {
  position: relative; padding: var(--space-4) 0 var(--space-4) var(--space-6);
  border-left: 2px solid var(--color-border); margin-left: var(--space-2);
}
.roadmap li:last-child { border-left-color: transparent; }
.roadmap li::before {
  content: ""; position: absolute; left: -7px; top: var(--space-4);
  width: 12px; height: 12px; border-radius: 50%; background: var(--color-primary);
}
.roadmap li h3 { margin-bottom: var(--space-1); }
.roadmap li p { margin-bottom: 0; color: var(--color-text-muted); }

/* ---------- Utility text ---------- */
.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.section-title { display: flex; align-items: baseline; justify-content: space-between; gap: var(--space-3); margin-bottom: var(--space-4); }
.loading-indicator { display: flex; align-items: center; gap: var(--space-2); color: var(--color-text-muted); font-size: var(--fs-sm); padding: var(--space-4) 0; }
.empty-state { text-align: center; padding: var(--space-6); color: var(--color-text-muted); }

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}