/* ================================================================
   assets/css/sd-module-a1.css
   Styles for LLD Module A1 — SOLID + OOP + UML
   Loaded via  custom_css: sd-module-a1  in front matter
   ================================================================ */

:root {
  --m1-bg:      #080c14;
  --m1-surface: #0e1420;
  --m1-surf2:   #141c2e;
  --m1-border:  #1e2a40;
  --m1-border2: #263450;
  --m1-text:    #d4deff;
  --m1-muted:   #7888b8;
  --m1-bright:  #e8eeff;

  --m1-s: #00e5ff;   /* S — cyan   */
  --m1-o: #69ff47;   /* O — green  */
  --m1-l: #ffb800;   /* L — amber  */
  --m1-i: #ff6b6b;   /* I — red    */
  --m1-d: #b47aff;   /* D — purple */

  --m1-good: #00c853;
  --m1-bad:  #ff3d3d;
  --m1-warn: #ffab00;
}

/* ── Page wrapper ─────────────────────────────────────────────── */
.m1-page {
  background: var(--m1-bg);
  color: var(--m1-text);
  font-family: 'Outfit', 'Inter', sans-serif;
  min-height: 100vh;
  position: relative;
}

/* Grid background */
.m1-page::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,229,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,255,0.015) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* ── Header ───────────────────────────────────────────────────── */
.m1-header {
  position: relative;
  padding: 52px 64px 44px;
  border-bottom: 1px solid var(--m1-border);
  overflow: hidden;
  z-index: 1;
}
.m1-header-glow {
  position: absolute;
  top: -80px; left: -40px;
  width: 400px; height: 300px;
  background: radial-gradient(ellipse, rgba(0,229,255,0.06) 0%, transparent 70%);
  pointer-events: none;
}
.m1-module-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,229,255,0.08);
  border: 1px solid rgba(0,229,255,0.2);
  padding: 6px 14px;
  border-radius: 4px;
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 11px;
  color: var(--m1-s);
  letter-spacing: 1px;
  margin-bottom: 20px;
}
.m1-module-badge::before { content: '▸'; }

.m1-solid-letters {
  display: inline-flex;
  gap: 0;
  margin-bottom: 8px;
}
.m1-solid-letter {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 800;
  line-height: 1.05;
}
.m1-solid-letter.s { color: var(--m1-s); }
.m1-solid-letter.o { color: var(--m1-o); }
.m1-solid-letter.l { color: var(--m1-l); }
.m1-solid-letter.i { color: var(--m1-i); }
.m1-solid-letter.d { color: var(--m1-d); }

.m1-header h1 {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  color: var(--m1-bright);
  margin: 0 0 8px;
}

.m1-pills {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.m1-pill {
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  padding: 5px 12px;
  border: 1px solid var(--m1-border2);
  color: var(--m1-muted);
  border-radius: 3px;
}
.m1-pill span { color: var(--m1-text); }

/* ── Navigation tabs ──────────────────────────────────────────── */
.m1-nav {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--m1-border);
  background: var(--m1-surface);
  position: sticky;
  top: 0;
  z-index: 100;
  overflow-x: auto;
}
.m1-nav-tab {
  padding: 16px 22px;
  font-size: 12px;
  font-weight: 600;
  font-family: 'Fira Code', monospace;
  color: var(--m1-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
  white-space: nowrap;
  letter-spacing: 0.3px;
}
.m1-nav-tab:hover { color: var(--m1-text); }
.m1-nav-tab.active { color: var(--m1-bright); border-bottom-color: var(--m1-s); }

/* ── Content area ─────────────────────────────────────────────── */
.m1-content {
  padding: 48px 64px;
  position: relative;
  z-index: 1;
}
.m1-view { display: none; }
.m1-view.active { display: block; }

/* ── OOP Pillar cards ─────────────────────────────────────────── */
.m1-pillars-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}
.m1-pillar-card {
  background: var(--m1-surface);
  border: 1px solid var(--m1-border);
  border-radius: 12px;
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s, border-color 0.2s;
}
.m1-pillar-card:hover {
  transform: translateY(-2px);
  border-color: var(--m1-border2);
}
.m1-pillar-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
}
.m1-pillar-card:nth-child(1)::before { background: var(--m1-s); }
.m1-pillar-card:nth-child(2)::before { background: var(--m1-o); }
.m1-pillar-card:nth-child(3)::before { background: var(--m1-l); }
.m1-pillar-card:nth-child(4)::before { background: var(--m1-d); }

.m1-pillar-icon { font-size: 28px; margin-bottom: 12px; }
.m1-pillar-name { font-size: 18px; font-weight: 700; color: var(--m1-bright); margin-bottom: 8px; }
.m1-pillar-tagline {
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  margin-bottom: 12px;
  padding: 4px 10px;
  border-radius: 3px;
  display: inline-block;
}
.m1-pillar-card:nth-child(1) .m1-pillar-tagline { background: rgba(0,229,255,0.1); color: var(--m1-s); }
.m1-pillar-card:nth-child(2) .m1-pillar-tagline { background: rgba(105,255,71,0.1); color: var(--m1-o); }
.m1-pillar-card:nth-child(3) .m1-pillar-tagline { background: rgba(255,184,0,0.1); color: var(--m1-l); }
.m1-pillar-card:nth-child(4) .m1-pillar-tagline { background: rgba(180,122,255,0.1); color: var(--m1-d); }
.m1-pillar-body { font-size: 13px; color: var(--m1-muted); line-height: 1.7; }

/* ── SOLID principle selector ─────────────────────────────────── */
.m1-solid-nav {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.m1-solid-btn {
  padding: 10px 20px;
  border-radius: 6px;
  border: 1px solid var(--m1-border);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--m1-surface);
  font-family: 'Outfit', sans-serif;
  color: var(--m1-muted);
}
.m1-solid-btn:hover { border-color: var(--m1-border2); color: var(--m1-text); }
.m1-solid-btn.s.active { background: rgba(0,229,255,0.12); border-color: var(--m1-s); color: var(--m1-s); }
.m1-solid-btn.o.active { background: rgba(105,255,71,0.12); border-color: var(--m1-o); color: var(--m1-o); }
.m1-solid-btn.l.active { background: rgba(255,184,0,0.12); border-color: var(--m1-l); color: var(--m1-l); }
.m1-solid-btn.i.active { background: rgba(255,107,107,0.12); border-color: var(--m1-i); color: var(--m1-i); }
.m1-solid-btn.d.active { background: rgba(180,122,255,0.12); border-color: var(--m1-d); color: var(--m1-d); }

.m1-solid-panel { display: none; }
.m1-solid-panel.active { display: block; }

.m1-principle-header {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 28px;
}
.m1-principle-letter {
  font-size: 80px;
  font-weight: 800;
  line-height: 1;
  flex-shrink: 0;
}
.m1-principle-letter.s { color: var(--m1-s); }
.m1-principle-letter.o { color: var(--m1-o); }
.m1-principle-letter.l { color: var(--m1-l); }
.m1-principle-letter.i { color: var(--m1-i); }
.m1-principle-letter.d { color: var(--m1-d); }

.m1-principle-name { font-size: 22px; font-weight: 700; color: var(--m1-bright); margin-bottom: 4px; }
.m1-principle-full { font-family: 'Fira Code', monospace; font-size: 12px; color: var(--m1-muted); margin-bottom: 8px; }
.m1-principle-quote {
  font-size: 15px;
  color: var(--m1-text);
  font-style: italic;
  line-height: 1.5;
  padding: 12px 16px;
  border-left: 3px solid;
  background: var(--m1-surf2);
}

/* ── Code comparison boxes ────────────────────────────────────── */
.m1-code-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 20px 0;
}
.m1-code-box {
  background: var(--m1-surf2);
  border-radius: 8px;
  overflow: hidden;
}
.m1-code-box-hd {
  padding: 10px 16px;
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
}
.m1-code-box-hd.bad  { background: rgba(255,61,61,0.15); color: var(--m1-bad); border-bottom: 1px solid rgba(255,61,61,0.2); }
.m1-code-box-hd.good { background: rgba(0,200,83,0.15);  color: var(--m1-good); border-bottom: 1px solid rgba(0,200,83,0.2); }
.m1-code-content {
  padding: 16px;
  font-family: 'Fira Code', monospace;
  font-size: 11.5px;
  line-height: 1.8;
  color: #8899cc;
  overflow-x: auto;
  white-space: pre;
}
.m1-code-content .kw  { color: #7eb6ff; }
.m1-code-content .cls { color: #ffd080; }
.m1-code-content .fn  { color: #80ffb4; }
.m1-code-content .cm  { color: #3d5070; }
.m1-code-content .str { color: #ff9980; }
.m1-code-content .hl  { color: var(--m1-bad); }
.m1-code-content .fix { color: var(--m1-good); }

.m1-interview-tip {
  margin-top: 16px;
  padding: 14px 16px;
  background: rgba(255,184,0,0.06);
  border: 1px solid rgba(255,184,0,0.15);
  border-radius: 8px;
  font-size: 13px;
  color: var(--m1-l);
  line-height: 1.6;
}
.m1-interview-tip::before { content: '⚡ Interview: '; font-weight: 600; }

/* ── UML section ──────────────────────────────────────────────── */
.m1-uml-container {
  background: var(--m1-surface);
  border: 1px solid var(--m1-border);
  border-radius: 12px;
  padding: 32px;
  margin-bottom: 24px;
}
.m1-uml-title {
  font-size: 13px;
  font-family: 'Fira Code', monospace;
  color: var(--m1-muted);
  margin-bottom: 20px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.m1-uml-class {
  background: var(--m1-surf2);
  border: 1px solid var(--m1-border2);
  border-radius: 6px;
  overflow: hidden;
  width: fit-content;
  min-width: 180px;
  font-family: 'Fira Code', monospace;
  font-size: 12px;
  transition: box-shadow 0.2s, border-color 0.2s;
  cursor: pointer;
}
.m1-uml-class:hover {
  border-color: var(--m1-s);
  box-shadow: 0 0 0 1px rgba(0,229,255,0.2);
}
.m1-uml-class-name {
  background: rgba(0,229,255,0.08);
  padding: 8px 14px;
  color: var(--m1-s);
  font-weight: 500;
  text-align: center;
  border-bottom: 1px solid var(--m1-border2);
}
.m1-uml-class-name.abstract  { font-style: italic; color: var(--m1-l); background: rgba(255,184,0,0.06); }
.m1-uml-class-name.interface { color: var(--m1-d); background: rgba(180,122,255,0.06); }
.m1-uml-class-section  { padding: 8px 14px; border-bottom: 1px solid var(--m1-border); }
.m1-uml-class-section:last-child { border-bottom: none; }
.m1-uml-attr   { color: #8899cc; padding: 2px 0; }
.m1-uml-attr .private   { color: var(--m1-bad);  margin-right: 4px; }
.m1-uml-attr .protected { color: var(--m1-warn); margin-right: 4px; }
.m1-uml-attr .public    { color: var(--m1-good); margin-right: 4px; }
.m1-uml-method { color: #80ffb4; padding: 2px 0; }

/* Relationship legend */
.m1-rel-legend {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
  margin: 20px 0;
}
.m1-rel-item {
  background: var(--m1-surf2);
  border: 1px solid var(--m1-border);
  border-radius: 8px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.m1-rel-symbol { font-family: 'Fira Code', monospace; font-size: 14px; color: var(--m1-s); width: 80px; flex-shrink: 0; }
.m1-rel-info   { font-size: 12px; }
.m1-rel-name   { font-weight: 600; color: var(--m1-text); margin-bottom: 2px; }
.m1-rel-desc   { color: var(--m1-muted); font-size: 11px; }

/* Parking lot diagram */
.m1-parking-diagram { display: flex; flex-direction: column; gap: 24px; align-items: center; }
.m1-parking-row { display: flex; gap: 24px; align-items: flex-start; justify-content: center; flex-wrap: wrap; }
.m1-parking-connector { display: flex; flex-direction: column; align-items: center; color: var(--m1-muted); font-family: 'Fira Code', monospace; font-size: 11px; gap: 2px; }
.m1-connector-line { width: 2px; height: 32px; background: var(--m1-border2); }
.m1-connector-diamond { width: 10px; height: 10px; background: var(--m1-s); transform: rotate(45deg); }

/* ── Violation scanner ────────────────────────────────────────── */
.m1-scanner { background: var(--m1-surface); border: 1px solid var(--m1-border); border-radius: 12px; padding: 28px; margin-bottom: 24px; }
.m1-scanner-title { font-size: 14px; font-weight: 700; color: var(--m1-bright); margin-bottom: 20px; display: flex; align-items: center; gap: 8px; }
.m1-violation-list { display: flex; flex-direction: column; gap: 10px; }
.m1-violation-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 16px;
  background: var(--m1-surf2);
  border-radius: 8px;
  border-left: 3px solid transparent;
  transition: all 0.15s;
}
.m1-violation-item:hover { border-left-color: var(--m1-bad); background: rgba(255,61,61,0.05); }
.m1-v-principle {
  font-family: 'Fira Code', monospace;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  flex-shrink: 0;
  width: 32px;
  text-align: center;
}
.m1-v-principle.s { background: rgba(0,229,255,0.15); color: var(--m1-s); }
.m1-v-principle.o { background: rgba(105,255,71,0.15); color: var(--m1-o); }
.m1-v-principle.l { background: rgba(255,184,0,0.15);  color: var(--m1-l); }
.m1-v-principle.i { background: rgba(255,107,107,0.15);color: var(--m1-i); }
.m1-v-principle.d { background: rgba(180,122,255,0.15);color: var(--m1-d); }
.m1-v-text { font-size: 13px; color: var(--m1-muted); line-height: 1.5; }
.m1-v-text strong { color: var(--m1-text); display: block; margin-bottom: 2px; }

/* ── Task cards ───────────────────────────────────────────────── */
.m1-task-grid { display: flex; flex-direction: column; gap: 16px; }
.m1-task-card { background: var(--m1-surface); border: 1px solid var(--m1-border); border-radius: 12px; overflow: hidden; }
.m1-task-head {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  transition: background 0.15s;
}
.m1-task-head:hover { background: var(--m1-surf2); }
.m1-task-num {
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 4px;
  background: rgba(0,229,255,0.1);
  color: var(--m1-s);
  flex-shrink: 0;
}
.m1-task-num.star { background: rgba(255,184,0,0.1); color: var(--m1-l); }
.m1-task-label  { font-size: 14px; font-weight: 600; color: var(--m1-bright); flex: 1; }
.m1-task-meta   { font-size: 11px; color: var(--m1-muted); font-family: 'Fira Code', monospace; }
.m1-task-chevron { color: var(--m1-muted); transition: transform 0.2s; font-size: 16px; }
.m1-task-chevron.open { transform: rotate(90deg); }
.m1-task-body {
  padding: 0 24px 24px;
  display: none;
  font-size: 13px;
  color: var(--m1-muted);
  line-height: 1.8;
}
.m1-task-body.open { display: block; }
.m1-task-body pre {
  background: var(--m1-surf2);
  border: 1px solid var(--m1-border);
  border-radius: 8px;
  padding: 16px;
  font-family: 'Fira Code', monospace;
  font-size: 11.5px;
  overflow-x: auto;
  margin: 12px 0;
  color: #8899cc;
  white-space: pre;
  line-height: 1.7;
}

/* ── Checklist ────────────────────────────────────────────────── */
.m1-checklist { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.m1-chk {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--m1-surface);
  border: 1px solid var(--m1-border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
}
.m1-chk:hover { border-color: var(--m1-border2); }
.m1-chk.done { border-color: rgba(0,200,83,0.3); background: rgba(0,200,83,0.04); }
.m1-chk-box {
  width: 18px; height: 18px;
  border: 1px solid var(--m1-border2);
  border-radius: 3px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--m1-good);
  transition: all 0.15s;
  margin-top: 1px;
}
.m1-chk.done .m1-chk-box  { background: var(--m1-good); border-color: var(--m1-good); color: #000; }
.m1-chk-label { font-size: 12px; color: var(--m1-muted); line-height: 1.5; }
.m1-chk.done .m1-chk-label { color: var(--m1-good); text-decoration: line-through; }

/* Progress bar */
.m1-progress-wrap { margin-bottom: 24px; }
.m1-progress-info {
  display: flex;
  justify-content: space-between;
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  color: var(--m1-muted);
  margin-bottom: 8px;
}
.m1-progress-track  { height: 4px; background: var(--m1-border); border-radius: 2px; overflow: hidden; }
.m1-progress-fill   { height: 100%; background: linear-gradient(90deg, var(--m1-s), var(--m1-o)); border-radius: 2px; transition: width 0.3s; width: 0%; }

/* ── OOP critical rule box ────────────────────────────────────── */
.m1-rule-box {
  background: var(--m1-surface);
  border: 1px solid var(--m1-border);
  border-radius: 12px;
  padding: 24px;
}
.m1-rule-label {
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  color: var(--m1-muted);
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.m1-rule-title { font-size: 15px; font-weight: 600; color: var(--m1-bright); margin-bottom: 10px; }
.m1-rule-body  { font-size: 13px; color: var(--m1-muted); line-height: 1.7; max-width: 680px; }
.m1-rule-examples { margin-top: 16px; display: flex; gap: 24px; flex-wrap: wrap; }
.m1-rule-example { font-family: 'Fira Code', monospace; font-size: 12px; }

/* ── Bottom navigation ────────────────────────────────────────── */
.m1-bottom-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 2.5rem;
  padding: 1.5rem 64px;
  border-top: 1px solid var(--m1-border);
  flex-wrap: wrap;
  gap: 0.75rem;
  background: var(--m1-surface);
}
.m1-nav-footer-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  text-decoration: none;
  background: var(--m1-surf2);
  border: 1px solid var(--m1-border2);
  color: var(--m1-text);
  transition: border-color 0.15s, color 0.15s;
}
.m1-nav-footer-btn:hover { border-color: var(--m1-s); color: var(--m1-s); }
.m1-nav-footer-btn.primary { background: linear-gradient(135deg, var(--m1-s), var(--m1-o)); color: #000; border-color: transparent; font-weight: 800; }

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 900px) {
  .m1-header  { padding: 32px 24px 28px; }
  .m1-content { padding: 32px 24px; }
  .m1-pillars-grid  { grid-template-columns: 1fr; }
  .m1-code-compare  { grid-template-columns: 1fr; }
  .m1-checklist     { grid-template-columns: 1fr; }
  .m1-bottom-nav    { padding: 1.5rem 24px; }
  .m1-principle-letter { font-size: 56px; }
}