:root {
  --bg: #06090d;
  --surface: #0b1118;
  --card: #0f1822;
  --card-hover: #152030;
  --border: #1a2d42;
  --border-bright: #253f5a;
  --text: #c8dcef;
  --text-dim: #6888a8;
  --text-bright: #edf4ff;
  --accent: #00c8c8;
  --p1: #00c8c8;
  --p2: #7c6fff;
  --p3: #f59e0b;
  --p4: #e8468e;
  --p5: #22d4a0;
  --p6: #ff6b35;
  --green: #22d4a0;
  --red: #ff4d6a;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: auto; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: #c8dcef;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ─── LAYOUT ─── */
.app {
  display: grid;
  grid-template-columns: 272px 1fr;
  grid-template-rows: 72px 1fr;
  height: 100vh;
  overflow: hidden;
}

/* ─── HEADER ─── */
header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  border-bottom: 1px solid var(--border);
  background: rgba(6,9,13,0.95);
  backdrop-filter: blur(16px);
  z-index: 200;
  position: relative;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 13px;
}

.brand-mark {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--accent), #006f7f);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-family: 'Syne', sans-serif;
  font-weight: 800; font-size: 16px;
  color: #06090d;
  flex-shrink: 0;
}

.brand-text h1 {
  font-family: 'Syne', sans-serif;
  font-size: 17px; font-weight: 800;
  color: var(--text-bright);
  letter-spacing: -0.4px;
  line-height: 1;
}

.brand-text h1 span { color: var(--accent); }

.brand-sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; color: var(--text-dim);
  letter-spacing: 1.2px;
  text-transform: uppercase;
  margin-top: 3px;
}

.header-center {
  display: flex;
  align-items: center;
  gap: 32px;
}

.header-stat {
  text-align: center;
}

.header-stat-val {
  font-family: 'Syne', sans-serif;
  font-size: 22px; font-weight: 800;
  color: var(--text-bright);
  line-height: 1;
}

.header-stat-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; color: var(--text-dim);
  letter-spacing: 1px; text-transform: uppercase;
  margin-top: 3px;
}

.header-divider {
  width: 1px; height: 32px;
  background: var(--border);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.overall-ring-wrap {
  position: relative;
  width: 52px; height: 52px;
}

.overall-ring-wrap svg { transform: rotate(-90deg); }

.ring-bg { fill: none; stroke: var(--border); stroke-width: 4; }
.ring-fill {
  fill: none; stroke: var(--accent); stroke-width: 4;
  stroke-linecap: round;
  stroke-dasharray: 131.95;
  stroke-dashoffset: 131.95;
  transition: stroke-dashoffset 0.7s cubic-bezier(0.4,0,0.2,1);
}

.ring-label {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; font-weight: 500;
  color: var(--accent);
}

.reset-btn {
  background: transparent;
  border: 1px solid var(--border-bright);
  color: var(--text);
  padding: 8px 16px;
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.5px;
  cursor: pointer;
  transition: all 0.2s;
  min-height: 36px;
}

.reset-btn:hover { border-color: var(--red); color: var(--red); }
.reset-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ─── SIDEBAR ─── */
aside {
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 20px 12px 20px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

aside::-webkit-scrollbar { width: 4px; }
aside::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.sidebar-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 0 10px;
  margin-bottom: 10px;
}

.phase-nav-item {
  display: flex; align-items: center; gap: 11px;
  padding: 9px 10px;
  border-radius: 9px;
  cursor: pointer;
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  text-decoration: none;
  margin-bottom: 3px;
  border: 1px solid transparent;
}

.phase-nav-item:hover { background: var(--card); }

.phase-nav-item.active {
  background: var(--card);
  border-color: var(--border-bright);
  box-shadow: inset 3px 0 0 var(--phase-color, var(--accent));
}

.phase-nav-item .nav-name {
  transition: color 0.25s ease;
}

.phase-nav-item.active .nav-name {
  color: var(--text-bright);
}

.nav-num {
  width: 30px; height: 30px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px; font-weight: 500;
  flex-shrink: 0;
}

.nav-info { flex: 1; min-width: 0; }

.nav-name {
  font-size: 12px; font-weight: 500;
  color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.nav-bar {
  height: 3px; background: var(--border);
  border-radius: 2px; margin-top: 5px; overflow: hidden;
}

.nav-bar-fill {
  height: 100%; border-radius: 2px;
  transition: width 0.5s ease;
}

.nav-pct {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; color: var(--text-dim);
  flex-shrink: 0;
}

.sidebar-divider {
  height: 1px; background: var(--border);
  margin: 16px 10px;
}

.sidebar-tip {
  margin: 0 2px;
  padding: 12px;
  background: rgba(0,200,200,0.04);
  border: 1px solid rgba(0,200,200,0.12);
  border-radius: 9px;
}

.tip-heading {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 1.2px; text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 7px;
}

.tip-text {
  font-size: 12px; color: var(--text-dim); line-height: 1.6;
}

/* ─── MAIN ─── */
main {
  overflow-y: auto;
  scroll-behavior: smooth;
  padding: 28px 32px 48px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

main::-webkit-scrollbar { width: 6px; }
main::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ─── PHASE CARDS ─── */
.phase-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  margin-bottom: 20px;
  overflow: hidden;
  animation: fadeUp 0.45s ease both;
  transition: border-color 0.25s;
}

.phase-card:hover { border-color: var(--border-bright); }

.phase-card:nth-child(1) { animation-delay: 0.04s; }
.phase-card:nth-child(2) { animation-delay: 0.08s; }
.phase-card:nth-child(3) { animation-delay: 0.12s; }
.phase-card:nth-child(4) { animation-delay: 0.16s; }
.phase-card:nth-child(5) { animation-delay: 0.20s; }
.phase-card:nth-child(6) { animation-delay: 0.24s; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

.phase-header {
  padding: 22px 26px;
  display: flex; align-items: flex-start;
  justify-content: space-between;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background 0.2s;
}

.phase-header:hover { background: rgba(255,255,255,0.015); }

.phase-header:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.phase-header-left {
  display: flex; align-items: flex-start; gap: 16px;
}

.phase-badge {
  width: 50px; height: 50px;
  border-radius: 13px;
  display: flex; align-items: center; justify-content: center;
  font-family: 'Syne', sans-serif;
  font-size: 22px; font-weight: 800;
  flex-shrink: 0;
}

.phase-badge-label {
  display: flex; flex-direction: column;
}

.phase-num-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.phase-name {
  font-family: 'Syne', sans-serif;
  font-size: 19px; font-weight: 700;
  color: var(--text-bright);
  line-height: 1.1;
}

.phase-chips {
  display: flex; align-items: center; gap: 8px;
  margin-top: 8px;
}

.chip {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; padding: 3px 9px;
  border-radius: 5px;
}

.chip-time {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-bright);
  color: var(--text-dim);
}

.phase-desc {
  font-size: 12.5px; color: var(--text-dim);
  line-height: 1.6; margin-top: 8px;
  max-width: 520px;
}

.phase-header-right {
  display: flex; flex-direction: column;
  align-items: flex-end; gap: 8px;
}

.mini-ring-wrap {
  position: relative; width: 52px; height: 52px;
}

.mini-ring-wrap svg { transform: rotate(-90deg); }

.mini-ring-bg { fill: none; stroke: var(--border); stroke-width: 3.5; }
.mini-ring-fill {
  fill: none; stroke-width: 3.5;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.6s cubic-bezier(0.4,0,0.2,1);
}

.mini-ring-text {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; font-weight: 500;
}

.caret {
  color: var(--text-dim); font-size: 16px;
  transition: transform 0.3s ease;
  margin-top: 4px;
  user-select: none;
}

.phase-card.collapsed .caret { transform: rotate(-90deg); }

/* ─── PHASE BODY ─── */
.phase-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.phase-card.collapsed .phase-body { display: none; }

/* Topics */
.topics-col {
  padding: 22px 26px;
  border-right: 1px solid var(--border);
}

.col-heading {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 1.8px; text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 14px;
  display: flex; align-items: center; gap: 10px;
}

.col-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.topic-row {
  display: flex; align-items: flex-start; gap: 11px;
  padding: 8px 0;
  min-height: 44px;
  border-bottom: 1px solid rgba(26,45,66,0.45);
}

.topic-row:last-child { border-bottom: none; }

.topic-cb {
  appearance: none; -webkit-appearance: none;
  width: 18px; height: 18px;
  border: 2px solid var(--border-bright);
  border-radius: 5px;
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 1px;
  transition: all 0.18s;
  position: relative;
}

.topic-cb:checked { background-color: var(--phase-clr); border-color: var(--phase-clr); }

.topic-cb:checked::after {
  content: '✓';
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: #06090d; font-size: 11px; font-weight: 700;
}

.topic-cb:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.topic-text { flex: 1; }

.topic-main {
  font-size: 12.5px; color: var(--text);
  line-height: 1.4;
  cursor: pointer;
  transition: color 0.2s;
}

.topic-sub {
  font-size: 11px; color: var(--text-dim);
  margin-top: 2px;
  font-style: italic;
}

.topic-row:has(.topic-cb:checked) .topic-main {
  color: var(--text-dim);
  text-decoration: line-through;
  text-decoration-color: rgba(90,120,152,0.5);
}

/* Right Column */
.right-col {
  display: flex; flex-direction: column;
}

/* Resources */
.resources-col {
  padding: 22px 26px;
  border-bottom: 1px solid var(--border);
  flex: 1;
}

.resource-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 11px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.18s;
  margin-bottom: 6px;
}

.resource-item:last-child { margin-bottom: 0; }

.resource-item:hover {
  border-color: var(--border-bright);
  background: rgba(255,255,255,0.025);
  transform: translateX(2px);
}

.resource-item:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.res-icon {
  width: 30px; height: 30px;
  border-radius: 7px;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; flex-shrink: 0;
}

.res-body { flex: 1; min-width: 0; }

.res-name {
  font-size: 12px; font-weight: 500;
  color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.res-type {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px; color: var(--text-dim);
  margin-top: 1px;
}

.res-arrow {
  color: var(--text-dim); font-size: 11px;
  transition: transform 0.18s, color 0.18s;
}

.resource-item:hover .res-arrow { transform: translateX(3px); color: var(--text); }

/* ─── PROJECT / APPLY IT ─── */
.project-col {
  padding: 18px 26px 22px;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.25s;
}

.project-card.proj-built {
  border-color: var(--phase-clr, var(--accent));
}

/* Top bar */
.proj-topbar {
  padding: 14px 16px;
  display: flex; align-items: center; gap: 12px;
  border-bottom: 1px solid var(--border);
}

.proj-emoji { font-size: 22px; flex-shrink: 0; }

.proj-title-wrap { flex: 1; min-width: 0; }

.proj-title {
  font-family: 'Syne', sans-serif;
  font-size: 13px; font-weight: 700;
  color: var(--text-bright);
  line-height: 1.3;
}

.proj-tags {
  display: flex; flex-wrap: wrap; gap: 4px;
  margin-top: 5px;
}

.proj-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px; padding: 2px 7px;
  background: var(--card);
  border: 1px solid var(--border-bright);
  border-radius: 4px; color: var(--text-dim);
}

.proj-done-btn {
  background: transparent;
  border: 1px solid var(--border-bright);
  color: var(--text-dim);
  padding: 5px 12px;
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 0.3px;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all 0.2s;
}

.proj-done-btn:hover {
  border-color: var(--phase-clr, var(--accent));
  color: var(--phase-clr, var(--accent));
}

.proj-done-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.project-card.proj-built .proj-done-btn {
  background: var(--phase-clr, var(--accent));
  border-color: var(--phase-clr, var(--accent));
  color: #06090d;
  font-weight: 600;
}

/* Body */
.proj-body { padding: 14px 16px; display: flex; flex-direction: column; gap: 14px; }

.proj-desc {
  font-size: 12px; color: var(--text-dim);
  line-height: 1.65; margin: 0;
}

/* Milestones */
.proj-milestones-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px; letter-spacing: 1.4px; text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 7px;
}

.milestone-item {
  display: flex; align-items: flex-start; gap: 9px;
  padding: 5px 0;
  border-bottom: 1px solid rgba(26,45,66,0.4);
}

.milestone-item:last-child { border-bottom: none; }

.milestone-cb {
  appearance: none; -webkit-appearance: none;
  width: 15px; height: 15px;
  border: 2px solid var(--border-bright);
  border-radius: 4px; cursor: pointer;
  flex-shrink: 0; margin-top: 1px;
  transition: all 0.18s; position: relative;
}

.milestone-cb:checked {
  background: var(--phase-clr, var(--accent));
  border-color: var(--phase-clr, var(--accent));
}

.milestone-cb:checked::after {
  content: '✓';
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: #06090d; font-size: 9px; font-weight: 700;
}

.milestone-cb:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.milestone-text {
  font-size: 11.5px; color: var(--text); line-height: 1.4; cursor: pointer;
  transition: color 0.2s;
}

.milestone-item:has(.milestone-cb:checked) .milestone-text {
  color: var(--text-dim);
  text-decoration: line-through;
  text-decoration-color: rgba(90,120,152,0.45);
}

/* Starter link */
.proj-starter {
  display: flex; align-items: center; gap: 8px;
  padding: 9px 11px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 7px;
  text-decoration: none;
  transition: all 0.18s;
}

.proj-starter:hover { border-color: var(--border-bright); background: var(--card-hover); }
.proj-starter:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.proj-starter-icon {
  font-size: 14px; flex-shrink: 0;
}

.proj-starter-text { flex: 1; }

.proj-starter-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px; letter-spacing: 1px; text-transform: uppercase;
  color: var(--text-dim);
}

.proj-starter-name {
  font-size: 11.5px; font-weight: 500; color: var(--text);
  margin-top: 1px;
}

.proj-starter-arrow {
  color: var(--text-dim); font-size: 11px;
  transition: transform 0.18s, color 0.18s;
}

.proj-starter:hover .proj-starter-arrow { transform: translateX(3px); color: var(--text); }

/* Portfolio tip & Stretch */
.proj-callout {
  padding: 10px 12px;
  border-radius: 7px;
  border: 1px solid;
}

.proj-callout-portfolio {
  background: rgba(124,111,255,0.05);
  border-color: rgba(124,111,255,0.2);
}

.proj-callout-stretch {
  background: rgba(245,158,11,0.05);
  border-color: rgba(245,158,11,0.2);
}

.callout-heading {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px; letter-spacing: 1px; text-transform: uppercase;
  margin-bottom: 5px;
}

.proj-callout-portfolio .callout-heading { color: #9d8fff; }
.proj-callout-stretch .callout-heading { color: var(--p3); }

.callout-text {
  font-size: 11.5px; color: var(--text-dim); line-height: 1.6;
}

/* ─── RESPONSIVE: TABLET (860px – 1100px) ─── */
@media (max-width: 1100px) and (min-width: 861px) {
  .app { grid-template-columns: 220px 1fr; }
  .phase-body { grid-template-columns: 1fr; }
  .topics-col { border-right: none; border-bottom: 1px solid var(--border); }
  .header-center { gap: 16px; }
  .header-stat-val { font-size: 18px; }
}

/* ─── RESPONSIVE: MOBILE ─── */
@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; grid-template-rows: 60px 1fr; }
  aside { display: none; }
  .phase-body { grid-template-columns: 1fr; }
  .topics-col { border-right: none; border-bottom: 1px solid var(--border); }
  header { padding: 0 16px; }
  .header-center { display: none; }
  main { padding: 16px 12px 40px; }
  .phase-header { padding: 16px; }
  .topics-col, .resources-col, .project-col { padding: 16px; }
  .phase-name { font-size: 16px; }
  .phase-chips { flex-wrap: wrap; }
}

/* ─── REDUCED MOTION ─── */
@media (prefers-reduced-motion: reduce) {
  .phase-card { animation: none; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}