/* PHY101 site styles — light "paper" palette for the dashboard and the syllabus.
   Specific to PHY101: these two pages no longer load the shared
   ../../../assets/course-design.css. */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --bg: #f7f3ea;
  --surface: #fffcf5;
  --surface2: #efeadf;
  --border: #d9d2c2;
  --border-strong: #cbc3b2;
  --text: #1c1a17;
  --text-mid: #3f3a32;
  --text-muted: #5e574c;
  --text-dim: #8a8273;
  --accent: #a63d2a;
  --accent-hover: #7d2d1f;
  --accent-soft: #f3e3de;
  --accent-tint: #f8ece8;
  --accent-line: #e2c4bb;
  --exam: #9a5b00;
  --exam-bg: #f7ebd3;
  --exam-line: #e2c48a;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --radius: 12px;
  --gutter: clamp(1rem, 4vw, 3rem);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}
a { color: var(--accent); }
a:hover { color: var(--accent-hover); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
button, input { font: inherit; }
.mono { font-family: var(--mono); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Top bar */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  min-height: 60px; padding: 0 var(--gutter);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.topbar-logo { display: flex; align-items: center; gap: 10px; font-size: .95rem; font-weight: 600; color: var(--text); text-decoration: none; }
.topbar-logo .mark {
  width: 26px; height: 26px; border-radius: 7px; display: inline-grid; place-items: center;
  background: var(--accent); color: #fff; font-family: var(--mono); font-size: .8rem; font-weight: 500;
}
.topbar-logo span.sub { color: var(--text-muted); font-weight: 400; }
.topbar-nav { display: flex; gap: 1.4rem; overflow-x: auto; scrollbar-width: none; }
.topbar-nav::-webkit-scrollbar { display: none; }
.topbar-nav a {
  display: inline-block; padding: 1.15rem 0; white-space: nowrap;
  font-size: .86rem; font-weight: 500; color: var(--text-muted); text-decoration: none;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.topbar-nav a:hover { color: var(--text); }
.topbar-nav a.active { color: var(--text); border-bottom-color: var(--accent); }

/* Term strip (persistent week navigation) */
.strip-wrap {
  position: sticky; top: 60px; z-index: 19;
  padding: .55rem var(--gutter);
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
}
.strip { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: thin; padding-bottom: 2px; }
.strip-btn {
  flex: 0 0 auto; display: flex; flex-direction: column; gap: 1px; min-width: 66px; min-height: 44px;
  padding: 6px 9px; border: 1px solid var(--border); border-radius: 8px; cursor: pointer;
  background: var(--surface); color: var(--text); text-align: left; text-decoration: none;
  transition: border-color .15s ease, background .15s ease;
}
.strip-btn:hover { border-color: var(--accent); }
.strip-btn .n { font-family: var(--mono); font-size: .74rem; font-weight: 500; }
.strip-btn .d { font-size: .66rem; color: var(--text-muted); white-space: nowrap; }
.strip-btn .m { font-size: .62rem; color: var(--accent); white-space: nowrap; }
.strip-btn.exam { background: var(--exam-bg); border-color: var(--exam-line); }
.strip-btn.exam .n { color: var(--exam); }
.strip-btn.now { background: var(--accent); border-color: var(--accent); color: #fff; }
.strip-btn.now .d, .strip-btn.now .m { color: #f1d4cc; }
.strip-btn.active { box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent); }
.strip-btn.all { min-width: 0; justify-content: center; }
.strip-btn.all .n { font-family: var(--sans); font-weight: 600; font-size: .8rem; }

/* Page shell */
.main { max-width: 1320px; margin: 0 auto; padding: clamp(1.6rem, 3.5vw, 2.6rem) var(--gutter) 4rem; }
.week-panel { display: none; }
.week-panel.active { display: block; }
.week-heading:focus { outline: none; }

/* Page header (overview and week pages) */
.page-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 2rem; flex-wrap: wrap; margin-bottom: 1.8rem; }
.page-head > div { display: flex; flex-direction: column; gap: .6rem; }
.week-tag { font-family: var(--mono); font-size: .76rem; color: var(--text-muted); }
.week-heading { font-size: clamp(1.8rem, 3.4vw, 2.75rem); font-weight: 600; letter-spacing: -.025em; line-height: 1.08; }
.week-heading em { font-style: normal; font-weight: 400; color: var(--text-muted); }
.week-heading .tr { display: block; font-size: .55em; font-weight: 400; color: var(--text-muted); margin-top: .35rem; letter-spacing: -.01em; }
.week-desc { max-width: 64ch; font-size: .96rem; line-height: 1.65; color: var(--text-mid); }
.week-desc + .week-desc { margin-top: .4rem; }
.chips { display: flex; gap: .45rem; flex-wrap: wrap; justify-content: flex-end; max-width: 440px; }
.chip {
  display: inline-block; padding: .35rem .75rem; border-radius: 999px;
  background: var(--surface2); color: var(--text-mid); font-size: .76rem; font-weight: 500; text-decoration: none;
}
.chip.accent { background: var(--accent-soft); color: var(--accent-hover); font-weight: 600; }
a.chip:hover { color: var(--text); background: var(--border); }

/* Overview: cards */
.grid-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; margin: 2rem 0 .8rem; font-size: .8rem; color: var(--text-muted); }
.grid-head strong { color: var(--text); font-weight: 600; font-size: .9rem; }
.legend { display: flex; gap: 1rem; flex-wrap: wrap; }
.legend span::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: .4rem; vertical-align: 1px; background: var(--accent); }
.legend span.exam::before { background: #e08a00; }
.legend span.none::before { background: var(--border-strong); }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; }
.card {
  display: flex; flex-direction: column; gap: .55rem;
  padding: 1.1rem 1.2rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
  transition: border-color .15s ease, transform .15s ease;
}
.card:hover { border-color: var(--accent); }
.card.now { background: var(--accent-tint); border-color: var(--accent); }
.card.exam { background: var(--exam-bg); border-color: var(--exam-line); }
.card-meta { display: flex; justify-content: space-between; font-family: var(--mono); font-size: .74rem; color: var(--text-muted); }
.card-meta .n { color: var(--accent); font-weight: 500; }
.card.exam .card-meta .n { color: var(--exam); }
.card-title { font-size: 1.05rem; font-weight: 600; line-height: 1.3; color: var(--text); text-decoration: none; }
.card-title:hover { color: var(--accent); }
.card-tr { font-size: .84rem; color: var(--text-muted); line-height: 1.4; }
.card-lab { display: flex; align-items: center; gap: .45rem; font-size: .8rem; color: var(--text-mid); }
.card-lab::before { content: ""; flex: 0 0 8px; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.card-lab.none::before { background: var(--border-strong); }
.card-lab.exam::before { background: #e08a00; }
.card-lab a { color: var(--text-mid); }
.card .button-row { margin-top: .3rem; }

/* Buttons */
.button-row { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }
.nb-btn {
  display: inline-flex; align-items: center; min-height: 38px; padding: .5rem .85rem; border-radius: 8px;
  font-size: .8rem; font-weight: 600; text-decoration: none; line-height: 1;
  background: var(--accent); color: #fff; border: 1px solid var(--accent);
  transition: background .15s ease, border-color .15s ease;
}
.nb-btn:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
.nb-btn.secondary { background: var(--surface); color: var(--text); border-color: var(--border-strong); font-weight: 500; }
.nb-btn.secondary:hover { border-color: var(--accent); color: var(--accent); background: var(--surface); }

/* Resources under the overview */
.resources { margin-top: 2.4rem; padding-top: 1.4rem; border-top: 1px solid var(--border); }
.resources h2 { font-size: .9rem; font-weight: 600; margin-bottom: .7rem; }
.resources ul { list-style: none; display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: .5rem 1.5rem; }
.resources li { font-size: .88rem; color: var(--text-muted); }
.resources li a { font-weight: 500; }

/* Week page: two columns */
.week-body { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 2.5rem; align-items: start; }
.week-main { display: flex; flex-direction: column; gap: 1.6rem; }
.notebook-card {
  display: flex; flex-direction: column; gap: .8rem;
  padding: 1.3rem 1.4rem; border: 1px solid var(--accent-line); border-radius: var(--radius); background: var(--accent-tint);
}
.notebook-card .what { font-size: .92rem; line-height: 1.55; color: var(--text-mid); }
.notebook-card .what strong { display: block; color: var(--text); font-size: 1.02rem; margin-bottom: .2rem; }
.nb-filename { font-family: var(--mono); font-size: .76rem; color: var(--text-muted); }
.section-title { font-size: .84rem; font-weight: 600; color: var(--text); margin-bottom: .5rem; }
.goals { padding-left: 1.3rem; font-size: .96rem; line-height: 1.7; color: var(--text-mid); }
.goals li + li { margin-top: .25rem; }
.line { font-size: .9rem; line-height: 1.6; color: var(--text-mid); }
.line strong { color: var(--text); }
.week-aside { display: flex; flex-direction: column; gap: .9rem; }
.aside-card { padding: 1rem 1.15rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.aside-card h3 { font-size: .78rem; font-weight: 600; color: var(--text-muted); margin-bottom: .4rem; }
.aside-card .big { font-size: .98rem; font-weight: 600; color: var(--text); }
.aside-card .sub { font-size: .84rem; color: var(--text-muted); }
.aside-card p { font-size: .88rem; line-height: 1.55; color: var(--text-mid); margin-top: .35rem; }
.aside-card p a { font-weight: 500; }
.prev-next { display: flex; justify-content: space-between; gap: 1rem; font-size: .86rem; font-weight: 500; }
.prev-next a { text-decoration: none; }
.prev-next span:last-child { text-align: right; }

/* Extensions page */
.ext-row {
  display: flex; flex-wrap: wrap; align-items: center; gap: .8rem 1.4rem;
  padding: 1rem 0; border-bottom: 1px solid var(--border);
}
.ext-row .what { flex: 1 1 320px; }
.ext-row .what strong { display: block; font-size: 1rem; font-weight: 600; }
.ext-row .what strong em { font-style: normal; font-weight: 400; color: var(--text-muted); }
.ext-row .what span { display: block; font-size: .84rem; color: var(--text-muted); line-height: 1.5; margin-top: .15rem; }

/* No-JS fallback table */
noscript table { border-collapse: collapse; margin-top: 1rem; background: var(--surface); }
noscript td, noscript th { border: 1px solid var(--border); padding: .4rem .6rem; text-align: left; vertical-align: top; }

@media (max-width: 900px) {
  .week-body { grid-template-columns: 1fr; gap: 1.6rem; }
  .page-head { align-items: flex-start; }
  .chips { justify-content: flex-start; }
}
@media (max-width: 600px) {
  /* Phones: the top bar wraps onto two lines and stops being sticky; the term strip sticks instead. */
  .topbar { position: static; flex-wrap: wrap; min-height: 0; padding-top: .6rem; }
  .topbar-logo .sub { display: none; }
  .topbar-nav { width: 100%; flex-wrap: wrap; overflow: visible; gap: 0 1rem; }
  .topbar-nav a { padding: .55rem 0 .7rem; font-size: .82rem; }
  .strip-wrap { top: 0; }
  .cards { grid-template-columns: 1fr; }
  .prev-next { flex-direction: column; }
  .prev-next span:last-child { text-align: left; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .card, .nb-btn, .strip-btn { transition: none; }
}

/* ---------------------------------------------------------------------- */
/* Syllabus page                                                          */
/* ---------------------------------------------------------------------- */
.hero { padding: clamp(2rem, 4vw, 3.2rem) var(--gutter) clamp(1.6rem, 3vw, 2.4rem); border-bottom: 1px solid var(--border); background: var(--surface2); }
.hero-inner { max-width: 1000px; margin: 0 auto; display: flex; flex-direction: column; gap: .8rem; }
.hero h1 { font-size: clamp(1.9rem, 3.6vw, 2.9rem); font-weight: 600; letter-spacing: -.025em; line-height: 1.05; }
.hero h1 em { font-style: normal; font-weight: 400; color: var(--text-muted); }
.hero .subtitle { font-family: var(--mono); font-size: .8rem; color: var(--text-muted); }
.hero-meta { display: flex; flex-wrap: wrap; gap: .45rem; }
.hero-meta-item { display: inline-block; padding: .35rem .75rem; border-radius: 999px; background: var(--surface); border: 1px solid var(--border); font-size: .78rem; color: var(--text-mid); }
.hero-meta-item strong { font-weight: 600; color: var(--text); }
.hero-meta-item a { color: inherit; text-decoration: none; }
.core-mastery-hero {
  max-width: 62ch; margin-top: .4rem; padding: .9rem 1.2rem; border-left: 3px solid var(--accent); border-radius: 0 10px 10px 0;
  background: var(--accent-tint); font-size: 1.05rem; font-weight: 500; line-height: 1.5; color: var(--text);
}

.content { max-width: 1000px; margin: 0 auto; padding: clamp(1.6rem, 3.5vw, 2.6rem) var(--gutter) 3rem; }
.section { margin-bottom: 2.8rem; }
.section-title.h2, h2.section-title { font-size: 1.25rem; font-weight: 600; letter-spacing: -.015em; color: var(--text); margin-bottom: 1rem; padding-bottom: .5rem; border-bottom: 1px solid var(--border); }
.content p { color: var(--text-mid); }
.content p strong { color: var(--text); }

.info-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: .8rem; margin-bottom: 1.2rem; }
.info-card { padding: .9rem 1rem; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); }
.info-card .label { font-size: .72rem; font-weight: 600; color: var(--text-muted); margin-bottom: .2rem; }
.info-card .value { font-size: .92rem; color: var(--text); }

.outcome-list { list-style: none; counter-reset: outcome; display: flex; flex-direction: column; gap: .45rem; }
.outcome-list li {
  counter-increment: outcome; position: relative; padding: .7rem .9rem .7rem 3rem; font-size: .9rem; line-height: 1.55;
  border: 1px solid var(--border); border-radius: 10px; background: var(--surface); color: var(--text-mid);
}
.outcome-list li::before {
  content: counter(outcome, decimal-leading-zero); position: absolute; left: .9rem; top: .75rem;
  font-family: var(--mono); font-size: .8rem; font-weight: 500; color: var(--accent);
}
.outcome-list li strong { color: var(--text); }

.schedule-table { width: 100%; border-collapse: collapse; font-size: .88rem; }
.schedule-table th { padding: .55rem .7rem; text-align: left; font-size: .74rem; font-weight: 600; color: var(--text-muted); border-bottom: 2px solid var(--border); }
.schedule-table td { padding: .75rem .7rem; border-bottom: 1px solid var(--border); vertical-align: top; }
.week-num-cell { font-family: var(--mono); font-weight: 500; color: var(--accent); white-space: nowrap; font-size: .82rem; }
.week-num-cell span { color: var(--text-muted); }
.topic-title { font-weight: 600; color: var(--text); margin-bottom: .15rem; }
.topic-items { font-size: .8rem; color: var(--text-muted); line-height: 1.5; }
.phase-badge, .phase-row td { font-family: var(--mono); font-size: .7rem; color: var(--text-muted); }
.phase-row td { background: var(--surface2); padding: .45rem .7rem; }
.notebook-actions { display: flex; flex-direction: column; align-items: flex-start; gap: .45rem; min-width: 140px; }
.nb-link { font-size: .8rem; font-weight: 500; color: var(--accent); text-decoration: none; }
.nb-link:hover { text-decoration: underline; }
.nb-link.colab-link {
  display: inline-flex; align-items: center; min-height: 36px; padding: .45rem .8rem; border-radius: 8px;
  background: var(--accent); color: #fff; font-weight: 600; border: 1px solid var(--accent);
}
.nb-link.colab-link:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; text-decoration: none; }
.card-copy { font-size: .9rem; line-height: 1.6; color: var(--text-mid); margin-bottom: 1rem; }

.grade-table { width: 100%; border-collapse: collapse; font-size: .9rem; margin-bottom: 1.4rem; }
.grade-table th, .grade-table td { padding: .7rem .9rem; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.grade-table th { font-size: .74rem; font-weight: 600; color: var(--text-muted); border-bottom-width: 2px; }
.grade-table .pct { font-family: var(--mono); font-weight: 500; color: var(--accent); font-size: 1rem; }

.policy-block { margin-bottom: 1.4rem; }
.policy-block h3 { font-size: .95rem; font-weight: 600; color: var(--text); margin: 1rem 0 .35rem; }
.policy-block h3:first-child { margin-top: 0; }
.policy-block p, .policy-block ul { font-size: .9rem; color: var(--text-mid); line-height: 1.7; }
.policy-block p + p { margin-top: .5rem; }
.policy-block ul { padding-left: 1.2rem; margin-top: .3rem; }
.policy-block li { margin-bottom: .3rem; }
.policy-block li strong { color: var(--text); }

.ref-list { list-style: none; display: flex; flex-direction: column; gap: .45rem; }
.ref-list li { padding: .75rem .9rem; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); font-size: .86rem; line-height: 1.55; color: var(--text-mid); }
.ref-list li strong { color: var(--text); }

footer { max-width: 1000px; margin: 0 auto; padding: 1.4rem var(--gutter) 2.5rem; font-size: .78rem; color: var(--text-muted); border-top: 1px solid var(--border); }

@media print {
  .topbar, .strip-wrap { display: none; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .hero { background: #fff; padding: 0 0 1rem; }
  .content { max-width: 100%; padding: 1rem 0; }
  .section { page-break-inside: avoid; }
  .schedule-table { font-size: 9pt; }
  .nb-link.colab-link { background: none; color: #000; border: 1px solid #000; }
}
@media (max-width: 768px) {
  .schedule-table { font-size: .8rem; }
  .info-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  #calendar-schedule-table { display: block; min-width: 0; }
  #calendar-schedule-table thead { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
  #calendar-schedule-table tbody { display: grid; gap: .8rem; }
  #calendar-schedule-table tr { display: block; border: 1px solid var(--border); border-radius: 10px; padding: .8rem; background: var(--surface); }
  #calendar-schedule-table td { display: block; border: 0; padding: .3rem 0; }
  .notebook-actions { flex-direction: row; flex-wrap: wrap; align-items: center; min-width: 0; }
}