:root {
  --bg: #fff8f0;
  --bg-alt: #ffffff;
  --ink: #1c1530;
  --ink-soft: #5a4e72;
  --muted: #7c7191;

  --pink: #ff3d81;
  --orange: #ff8a3d;
  --yellow: #ffc93d;
  --teal: #16c79a;
  --blue: #3d8bff;
  --purple: #8a4dff;

  --grad-main: linear-gradient(120deg, var(--pink), var(--orange) 55%, var(--yellow));
  --grad-cool: linear-gradient(120deg, var(--purple), var(--blue), var(--teal));

  --card-bg: #ffffff;
  --card-border: #f0e6ff;
  --shadow-soft: 0 8px 24px rgba(90, 40, 130, 0.08);
  --shadow-pop: 0 14px 32px rgba(255, 61, 129, 0.18);

  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;

  --dur-in: 200ms;
  --dur-out: 160ms;
  --ease-out: cubic-bezier(.16,1,.3,1);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #140f22;
    --bg-alt: #1b1430;
    --ink: #fdf6ff;
    --ink-soft: #d8caf0;
    --muted: #a293c2;
    --card-bg: #201936;
    --card-border: #34275a;
    --shadow-soft: 0 8px 24px rgba(0,0,0,0.35);
    --shadow-pop: 0 14px 32px rgba(255, 61, 129, 0.28);
  }
}
:root[data-theme="dark"] {
  --bg: #140f22;
  --bg-alt: #1b1430;
  --ink: #fdf6ff;
  --ink-soft: #d8caf0;
  --muted: #a293c2;
  --card-bg: #201936;
  --card-border: #34275a;
  --shadow-soft: 0 8px 24px rgba(0,0,0,0.35);
  --shadow-pop: 0 14px 32px rgba(255, 61, 129, 0.28);
}

* { box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
  line-height: 1.55;
}

h1, h2, h3 { font-weight: 800; letter-spacing: -0.02em; line-height: 1.15; }

a { color: var(--pink); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* Confetti background layer */
.confetti-layer {
  position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden;
}
.confetti-layer span {
  position: absolute; top: -5%; border-radius: 3px; opacity: 0.55;
  animation: fall linear infinite;
}
@keyframes fall {
  to { transform: translateY(115vh) rotate(360deg); }
}

/* Topbar */
.topbar {
  position: sticky; top: 0; z-index: 40;
  background: rgba(255,248,240,0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--card-border);
}
:root[data-theme="dark"] .topbar, @media (prefers-color-scheme: dark) { }
.topbar { background: color-mix(in srgb, var(--bg) 88%, transparent); }

.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1180px; margin: 0 auto; padding: 18px 24px;
}
.brand { font-weight: 900; font-size: 1.2rem; color: var(--ink); text-decoration: none; }
.brand-num {
  background: var(--grad-main); -webkit-background-clip: text; background-clip: text; color: transparent;
}

.nav-toggle {
  display: none; flex-direction: column; gap: 4px; background: none; border: none; cursor: pointer; padding: 8px;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; }

.tabnav {
  display: flex; gap: 12px; flex-wrap: wrap; max-width: 1180px; margin: 0 auto;
  padding: 4px 20px 18px; overflow-x: auto;
}
.tab-btn {
  border: 2px solid transparent; background: var(--card-bg); color: var(--ink-soft);
  font-weight: 700; font-size: 0.9rem; padding: 11px 20px; border-radius: 999px;
  cursor: pointer; white-space: nowrap;
  transition: transform var(--dur-in) var(--ease-out), background var(--dur-in), color var(--dur-in), border-color var(--dur-in);
}
.tab-btn:hover { transform: translateY(-1px); border-color: var(--pink); }
.tab-btn.active { background: var(--grad-main); color: #fff; box-shadow: var(--shadow-pop); }
.tab-btn:focus-visible, .btn:focus-visible, .drawer-close:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }


/* Main / panels */
main { max-width: 1180px; margin: 0 auto; padding: 40px 24px 110px; position: relative; z-index: 1; }
.panel { display: none; }
.panel.active { display: block; animation: panelIn var(--dur-in) var(--ease-out); }
@keyframes panelIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.panel-title { font-size: clamp(1.7rem, 3.5vw, 2.4rem); margin: 4px 0 8px; }
.panel-sub { color: var(--ink-soft); margin: 0 0 28px; font-size: 1.08rem; }
.section-heading { margin: 48px 0 18px; font-size: 1.3rem; }
.muted { color: var(--muted); }

/* Sub-tabs (inside Plan) */
.subtabnav { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 36px; }
.subtab-btn {
  border: 2px solid var(--card-border); background: var(--card-bg); color: var(--ink-soft);
  font-weight: 800; font-size: 0.9rem; padding: 11px 20px; border-radius: 999px; cursor: pointer;
  transition: transform var(--dur-in) var(--ease-out), background var(--dur-in), color var(--dur-in), border-color var(--dur-in);
}
.subtab-btn:hover { transform: translateY(-1px); border-color: var(--purple); }
.subtab-btn.active { background: var(--grad-cool); color: #fff; border-color: transparent; box-shadow: var(--shadow-soft); }
.subpanel { display: none; }
.subpanel.active { display: block; animation: panelIn var(--dur-in) var(--ease-out); }

/* Hero */
.hero { padding: 12px 0 20px; }
.eyebrow { font-weight: 800; color: var(--pink); text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.8rem; margin-bottom: 10px; }
.hero h1 { font-size: clamp(2.1rem, 5.5vw, 3.4rem); margin: 0 0 16px; }
.text-pop { background: var(--grad-main); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { font-size: 1.2rem; color: var(--ink-soft); max-width: 640px; }
.hero-callout {
  margin: 30px 0; padding: 26px 30px; border-radius: var(--radius-lg);
  background: var(--grad-cool); color: #fff; font-size: 1.18rem; box-shadow: var(--shadow-pop);
}
.hero-body { max-width: 680px; color: var(--ink-soft); }

.stack-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px,1fr)); gap: 20px; margin: 32px 0; }
.stack-card {
  background: var(--card-bg); border: 2px solid var(--card-border); border-radius: var(--radius-md);
  padding: 24px 20px; text-align: center; box-shadow: var(--shadow-soft);
  transition: transform var(--dur-in) var(--ease-out);
}
.stack-card:hover { transform: translateY(-4px) scale(1.02); }
.stack-emoji { font-size: 2.1rem; display: block; margin-bottom: 8px; }
.stack-card h3 { margin: 4px 0 8px; }
.stack-card.c1 { border-color: color-mix(in srgb, var(--pink) 40%, var(--card-border)); }
.stack-card.c2 { border-color: color-mix(in srgb, var(--teal) 40%, var(--card-border)); }
.stack-card.c3 { border-color: color-mix(in srgb, var(--blue) 40%, var(--card-border)); }

.loop-banner {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center; font-weight: 800;
  background: var(--card-bg); border: 2px dashed var(--purple); border-radius: 999px;
  padding: 18px 26px; margin: 26px 0 10px; color: var(--purple);
}
.loop-banner .arrow { color: var(--pink); }
.hero-fine { color: var(--muted); font-size: 0.9rem; }

.cta-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.btn {
  border: none; border-radius: 999px; padding: 13px 22px; font-weight: 800; font-size: 0.95rem;
  cursor: pointer; transition: transform var(--dur-in) var(--ease-out), box-shadow var(--dur-in);
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--grad-main); color: #fff; box-shadow: var(--shadow-pop); }
.btn-primary:hover { transform: translateY(-2px); }
.btn-ghost { background: var(--card-bg); color: var(--ink); border: 2px solid var(--card-border); }
.btn-ghost:hover { border-color: var(--pink); color: var(--pink); }
.btn.small { padding: 8px 16px; font-size: 0.85rem; }

/* Cards / grids */
.card {
  background: var(--card-bg); border-radius: var(--radius-lg); padding: 28px 30px;
  border: 2px solid var(--card-border); box-shadow: var(--shadow-soft); margin-bottom: 24px;
}
.card.soft { background: var(--bg-alt); }
.grid-2.gap { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px,1fr)); gap: 24px; }
.highlight-good { border-color: color-mix(in srgb, var(--teal) 45%, var(--card-border)); }
.highlight-warn { border-color: color-mix(in srgb, var(--orange) 45%, var(--card-border)); }

.check-list, .numbered-list { padding-left: 1.2em; margin: 10px 0 0; }
.check-list li, .numbered-list li { margin-bottom: 8px; }

.chip-cloud { display: flex; flex-wrap: wrap; gap: 10px; margin: 16px 0; }
.chip {
  background: var(--grad-cool); color: #fff; padding: 9px 16px; border-radius: 999px;
  font-size: 0.87rem; font-weight: 700;
}

.badge {
  display: inline-block; font-size: 0.72rem; font-weight: 800; padding: 5px 12px; border-radius: 999px;
  margin-bottom: 12px;
}
.badge-time { background: #fff2d6; color: #9a6b00; }
.badge-watch { background: #e6ddff; color: #5a2fc2; }

.quote-line { font-style: italic; font-size: 1.05rem; }
.quote-line.dim { color: var(--muted); }
.source-note { font-size: 0.85rem; color: var(--muted); }
.source-link { font-size: 0.85rem; font-weight: 700; text-decoration: none; }

/* Degree cards */
.degree-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px,1fr)); gap: 24px; margin-bottom: 28px; }
.degree-card {
  background: var(--card-bg); border-radius: var(--radius-lg); padding: 26px; cursor: pointer;
  border: 2px solid var(--card-border); box-shadow: var(--shadow-soft); position: relative; overflow: hidden;
  transition: transform var(--dur-in) var(--ease-out), box-shadow var(--dur-in);
}
.degree-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 6px; background: var(--grad-main);
}
.degree-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-pop); }
.degree-card h3 { margin: 6px 0 2px; font-size: 1.05rem; }
.degree-card .dg-sub { color: var(--muted); font-size: 0.85rem; margin-bottom: 10px; }
.degree-card .dg-badges { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.mini-badge { font-size: 0.68rem; font-weight: 800; padding: 4px 9px; border-radius: 999px; background: var(--bg); color: var(--ink-soft); border: 1px solid var(--card-border); }
.dg-open-hint { font-size: 0.78rem; color: var(--pink); font-weight: 700; margin-top: 8px; }

/* Degree side panel (modal-ish) */
.drawer, .degree-modal {
  position: fixed; inset: 0; z-index: 60; display: flex; justify-content: flex-end;
}
.drawer[hidden], .degree-modal[hidden] { display: none; }
.drawer-backdrop, .modal-backdrop {
  position: absolute; inset: 0; background: rgba(20,10,40,0.45); backdrop-filter: blur(2px);
  animation: fadeIn var(--dur-in) var(--ease-out);
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.drawer-panel, .modal-panel {
  position: relative; background: var(--card-bg); width: min(460px, 92vw); height: 100%;
  padding: 30px; overflow-y: auto; box-shadow: -12px 0 40px rgba(0,0,0,0.2);
  animation: slideIn var(--dur-in) var(--ease-out);
}
@keyframes slideIn { from { opacity: 0; transform: translateX(16px) scale(0.98); } to { opacity: 1; transform: none; } }
.modal-panel {
  margin: auto; width: min(580px, 92vw); height: auto; max-height: 86vh; border-radius: var(--radius-lg);
  animation: modalIn var(--dur-in) var(--ease-out);
}
@keyframes modalIn { from { opacity: 0; transform: translateY(8px) scale(0.96); } to { opacity: 1; transform: none; } }
.drawer-head, .modal-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 14px; margin-bottom: 18px; }
.drawer-close, .modal-close {
  background: var(--bg); border: none; border-radius: 999px; width: 32px; height: 32px; cursor: pointer;
  font-size: 1rem; flex-shrink: 0;
}
.drawer-body a { display: block; margin-bottom: 14px; font-weight: 700; text-decoration: none; }
.drawer-body .src-group { margin-bottom: 26px; }
.drawer-body .src-group h4 { margin-bottom: 10px; color: var(--ink-soft); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; }

.modal-section { margin-bottom: 18px; }
.modal-section h4 { margin: 0 0 4px; color: var(--pink); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.03em; }
.modal-tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0; }

details.syllabus { margin-top: 10px; border-top: 1px solid var(--card-border); padding-top: 10px; }
details.syllabus summary { cursor: pointer; font-weight: 700; color: var(--purple); }
details.syllabus ul { margin: 8px 0 0; padding-left: 1.2em; }

/* Comparison table */
.table-wrap { overflow-x: auto; border-radius: var(--radius-md); border: 2px solid var(--card-border); margin-bottom: 8px; }
.compare-table { width: 100%; border-collapse: collapse; min-width: 560px; background: var(--card-bg); }
.compare-table th, .compare-table td { padding: 16px 18px; text-align: left; border-bottom: 1px solid var(--card-border); font-size: 0.9rem; }
.compare-table thead th { background: var(--grad-cool); color: #fff; font-weight: 800; }
.compare-table tbody tr:hover { background: color-mix(in srgb, var(--pink) 6%, transparent); }
.compare-table td.num { text-align: center; font-weight: 800; }

/* Mastery constellation */
.depth-key { display: flex; gap: 12px; margin-bottom: 24px; }
.depth-pill { font-size: 0.78rem; font-weight: 800; padding: 6px 14px; border-radius: 999px; }
.depth-know { background: #fff2d6; color: #9a6b00; }
.depth-practice { background: #d7f0ff; color: #0a6ea8; }
.depth-master { background: #ffe0ee; color: #c21a63; }

.constellation { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px,1fr)); gap: 18px; margin-bottom: 8px; }
.skill-node {
  background: var(--card-bg); border: 2px solid var(--card-border); border-radius: var(--radius-md);
  padding: 20px; cursor: pointer; transition: transform var(--dur-in) var(--ease-out), border-color var(--dur-in);
}
.skill-node:hover { transform: translateY(-3px); border-color: var(--purple); }
.skill-node h4 { margin: 0 0 6px; font-size: 0.98rem; }
.skill-node .depth-tag { font-size: 0.68rem; font-weight: 800; padding: 3px 9px; border-radius: 999px; }

/* Roadmap */
.roadmap-stage { display: flex; gap: 22px; margin-bottom: 30px; align-items: flex-start; }
.stage-badge {
  flex-shrink: 0; width: 70px; height: 70px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-weight: 900; color: #fff; font-size: 1rem; text-align: center;
}
.stage-1 { background: var(--grad-main); }
.stage-2 { background: var(--grad-cool); }
.stage-3 { background: linear-gradient(120deg, var(--teal), var(--blue)); }
.stage-body { background: var(--card-bg); border: 2px solid var(--card-border); border-radius: var(--radius-md); padding: 22px 26px; flex: 1; }
.stage-body h3 { margin: 0 0 12px; }
.target-line { margin-top: 14px; font-weight: 600; }

.stream-selector { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 20px; }
.stream-btn {
  border: 2px solid var(--card-border); background: var(--card-bg); border-radius: 999px; padding: 12px 20px;
  font-weight: 800; cursor: pointer; transition: transform var(--dur-in) var(--ease-out), border-color var(--dur-in);
}
.stream-btn:hover { transform: translateY(-2px); }
.stream-btn.active { background: var(--grad-main); color: #fff; border-color: transparent; }
.stream-detail { background: var(--card-bg); border: 2px solid var(--card-border); border-radius: var(--radius-md); padding: 24px 26px; min-height: 60px; }

.entrance-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px,1fr)); gap: 20px; }
.entrance-card { background: var(--card-bg); border: 2px solid var(--card-border); border-radius: var(--radius-md); padding: 20px 22px; }
.entrance-card h4 { margin: 0 0 8px; color: var(--purple); }

/* timeline mini (engineering / medicine) */
.timeline-mini { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px,1fr)); gap: 16px; margin-bottom: 28px; }
.tmini-step { background: var(--card-bg); border-left: 4px solid var(--pink); border-radius: var(--radius-sm); padding: 16px 18px; }
.tmini-step strong { display: block; margin-bottom: 4px; }
.tmini-step span { font-size: 0.85rem; color: var(--ink-soft); }

/* experiments */
.experiment-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px,1fr)); gap: 20px; margin-bottom: 32px; }
.experiment-card { background: var(--card-bg); border: 2px solid var(--card-border); border-radius: var(--radius-lg); padding: 24px; }
.experiment-card h3 { margin: 0 0 10px; }
.experiment-card ul { padding-left: 1.1em; margin: 12px 0 0; font-size: 0.9rem; color: var(--ink-soft); }

.checklist-card { background: var(--card-bg); border: 2px solid var(--card-border); border-radius: var(--radius-lg); padding: 10px 24px; margin-bottom: 16px; }
.checklist-item { display: flex; align-items: center; gap: 14px; padding: 16px 0; border-bottom: 1px solid var(--card-border); }
.checklist-item:last-child { border-bottom: none; }
.checklist-item input { width: 20px; height: 20px; accent-color: var(--pink); cursor: pointer; }
.checklist-item label { cursor: pointer; flex: 1; }
.checklist-item.done label { text-decoration: line-through; color: var(--muted); }

/* decade timeline */
.timeline-scroll { overflow-x: auto; padding-bottom: 12px; margin-bottom: 8px; }
.timeline-track { display: flex; gap: 16px; min-width: max-content; padding: 8px 4px 16px; position: relative; }
.timeline-node {
  width: 220px; background: var(--card-bg); border: 2px solid var(--card-border); border-radius: var(--radius-md);
  padding: 22px; position: relative; transition: transform var(--dur-in) var(--ease-out);
}
.timeline-node:hover { transform: translateY(-4px); }
.timeline-node .t-age {
  display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; border-radius: 50%;
  background: var(--grad-main); color: #fff; font-weight: 900; margin-bottom: 14px;
}
.timeline-node p { font-size: 0.88rem; color: var(--ink-soft); margin: 0; }

.birthday-card {
  background: var(--grad-cool); color: #fff; border-radius: var(--radius-lg); padding: 36px 34px; margin-top: 32px;
  font-size: 1.05rem;
}
.birthday-card p { margin: 0 0 16px; }
.birthday-signoff { font-weight: 800; margin-top: 20px; }

/* footer */
.site-footer {
  text-align: center; padding: 48px 24px 70px; color: var(--muted); font-size: 0.85rem;
  display: flex; flex-direction: column; align-items: center; gap: 14px; position: relative; z-index: 1;
}

/* Responsive nav */
@media (max-width: 780px) {
  .nav-toggle { display: flex; }
  .tabnav { display: none; flex-direction: column; padding: 10px 20px 16px; }
  .tabnav.open { display: flex; }
  .tab-btn { width: 100%; text-align: left; }
}