/* MathPrep with Ahmad Bilal: shared styles.
   Colours, fonts and spacing live in :root, so changing the look is a one-line edit. */

@font-face { font-family: "Poppins"; font-weight: 400; font-display: swap; src: url("/assets/fonts/poppins-regular.woff") format("woff"); }
@font-face { font-family: "Poppins"; font-weight: 500; font-display: swap; src: url("/assets/fonts/poppins-medium.woff") format("woff"); }
@font-face { font-family: "Poppins"; font-weight: 700; font-display: swap; src: url("/assets/fonts/poppins-bold.woff") format("woff"); }
@font-face { font-family: "Lora"; font-weight: 600; font-display: swap; src: url("/assets/fonts/lora-600.woff") format("woff"); }
@font-face { font-family: "Lora"; font-weight: 700; font-display: swap; src: url("/assets/fonts/lora-700.woff") format("woff"); }

:root {
  /* The four logo colours, slightly deepened where white text sits on them */
  --red: #c83823;
  --red-ink: #a52c1a;
  --blue: #1a76ad;
  --sky: #2aa0df;
  --green: #9dbf2f;
  --yellow: #f2c230;
  --navy: #0f2d46;
  --navy-2: #173b59;
  --ink: #1b2430;
  --gray: #5c6773;
  --bg: #fbf1ef;
  --paper: #ffffff;
  --line: #ead9d5;
  --wrap: 1120px;
  --r: 22px;
  --serif: "Lora", Georgia, "Times New Roman", serif;
  --sans: "Poppins", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--hh, 84px); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 920px; }

a { color: var(--blue); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--sky); outline-offset: 3px; }
h1, h2, h3, h4 { font-family: var(--serif); color: var(--navy); }

/* ---- Top bar ---- */
.top { position: sticky; top: 0; z-index: 40; background: var(--paper); border-bottom: 1px solid var(--line); }
.top::before { content: ""; display: block; height: 6px; background: linear-gradient(90deg, var(--red) 0 25%, var(--yellow) 25% 50%, var(--green) 50% 75%, var(--sky) 75% 100%); }
.top .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 22px; padding-top: 12px; padding-bottom: 12px; }
.top .brand img { display: block; height: 46px; width: auto; }
.top nav { display: flex; flex-wrap: wrap; align-items: center; gap: 0 4px; margin-left: auto; }
.top nav a { padding: 8px 11px; color: var(--ink); text-decoration: none; font-weight: 500; font-size: 0.93rem; border-radius: 999px; }
.top nav a:hover { background: var(--bg); }
.top nav a[aria-current="page"] { background: var(--bg); color: var(--navy); }
.top .menu-btn { display: none; }
.top .caret { display: none; }
.top .ext { font-size: 0.8em; opacity: 0.7; }

/* Drop-down menus (computer): open on hover or keyboard focus. The Menu button and expanding rows are the phone version below. */
@media (min-width: 1041px) {
  .top nav .has-menu { position: relative; display: flex; align-items: center; border-radius: 999px; }
  .top nav .has-menu > a { padding-right: 4px; }
  .top nav .has-menu > .caret { display: grid; place-items: center; width: 22px; height: 28px; margin-right: 6px; padding: 0; background: none; border: 0; color: var(--ink); cursor: pointer; border-radius: 50%; }
  .top nav .has-menu > .caret svg { width: 11px; height: 11px; }
  .top nav .has-menu:hover > a, .top nav .has-menu.open > a { background: var(--bg); }
  .top .menu, .top .fly { display: none; list-style: none; margin: 0; padding: 8px; position: absolute; z-index: 50; background: var(--paper); border: 1px solid var(--line); border-radius: 16px; box-shadow: 0 14px 34px rgba(15, 45, 70, 0.16); }
  .top .menu { top: 100%; left: 0; min-width: 270px; }
  .top .menu li { position: relative; margin: 0; }
  .top .menu a { display: block; padding: 9px 14px; border-radius: 10px; font-size: 0.92rem; line-height: 1.3; white-space: nowrap; }
  .top .menu li.has-fly { display: flex; align-items: center; }
  .top .menu li.has-fly > a { flex: 1; }
  .top .menu li.has-fly > .caret { display: grid; place-items: center; width: 26px; height: 30px; padding: 0; background: none; border: 0; color: var(--ink); cursor: pointer; }
  .top .menu li.has-fly > .caret svg { width: 11px; height: 11px; transform: rotate(-90deg); }
  .top .fly { top: -9px; left: 100%; min-width: 220px; margin-left: -2px; }
  .top .fly.flip, .top li.flip > .fly { left: auto; right: 100%; margin: 0 -2px 0 0; }
  .top .menu > li.all { border-top: 1px solid var(--line); margin-top: 6px; padding-top: 6px; }
  .top .menu > li.all a { font-weight: 600; color: var(--blue); }
  .top .has-menu.open > .menu, .top .menu li.has-fly.open > .fly { display: block; }
}
@media (min-width: 1041px) and (hover: hover) {
  .top .has-menu:hover > .menu, .top .has-menu:focus-within > .menu, .top .menu li.has-fly:hover > .fly, .top .menu li.has-fly:focus-within > .fly { display: block; }
}

@media (max-width: 1040px) {
  .top .wrap { padding-top: 8px; padding-bottom: 8px; gap: 4px 12px; }
  .top .brand img { height: 38px; }
  .top .btn.small { margin-left: auto; padding: 8px 18px; }
  .top .menu-btn { display: inline-block; padding: 8px 16px; font: 500 0.93rem/1.2 var(--sans); color: var(--navy); background: var(--bg); border: 1px solid var(--line); border-radius: 999px; cursor: pointer; }
  .top .menu-btn[aria-expanded="true"] { background: var(--navy); color: #fff; border-color: var(--navy); }
  .top nav { display: none; position: absolute; left: 0; right: 0; top: 100%; margin: 0; flex-direction: column; flex-wrap: nowrap; align-items: stretch; gap: 0; padding: 8px 16px 16px; background: var(--paper); border-bottom: 1px solid var(--line); box-shadow: 0 14px 30px rgba(15, 45, 70, 0.14); max-height: calc(100vh - var(--hh, 84px)); overflow-y: auto; }
  .top nav.open { display: flex; }
  .top nav a { display: block; padding: 12px 10px; font-size: 1rem; border-radius: 10px; }
  .top nav > a, .top .has-menu { border-bottom: 1px solid var(--line); border-radius: 0; }
  .top .has-menu { display: flex; flex-wrap: wrap; align-items: center; }
  .top .has-menu > a { flex: 1; }
  .top .caret { display: grid; place-items: center; width: 44px; height: 44px; padding: 0; background: none; border: 0; color: var(--navy); cursor: pointer; }
  .top .caret svg { width: 14px; height: 14px; transition: transform 0.15s; }
  .top .open > .caret svg { transform: rotate(180deg); }
  .top .menu, .top .fly { display: none; flex-basis: 100%; width: 100%; list-style: none; margin: 0; padding: 0 0 8px 12px; }
  .top .has-menu.open > .menu, .top li.has-fly.open > .fly { display: block; }
  .top .menu li { margin: 0; }
  .top .menu li.has-fly { display: flex; flex-wrap: wrap; align-items: center; }
  .top .menu li.has-fly > a { flex: 1; }
  .top .menu a { padding: 10px 10px; font-size: 0.95rem; }
  .top .fly { padding-left: 14px; border-left: 3px solid var(--sky); margin-left: 10px; }
  .top .menu > li.all a { font-weight: 600; color: var(--blue); }
}

/* Worksheet area pages: one heading per paper */
.paper-h { margin: 34px 0 12px; font-size: 1.35rem; scroll-margin-top: calc(var(--hh, 84px) + 12px); }
.paper-h:first-of-type { margin-top: 8px; }
.soon { margin: 0 0 8px; color: var(--muted, #5b6b78); }
.res-h, .res-sub { scroll-margin-top: calc(var(--hh, 84px) + 12px); }

/* ---- Buttons ---- */
.btn {
  display: inline-block;
  padding: 13px 26px;
  font: 500 1rem/1.3 var(--sans);
  text-decoration: none;
  border: 2px solid var(--red);
  border-radius: 999px;
  background: var(--red);
  color: #fff;
  cursor: pointer;
  transition: background 0.15s, transform 0.15s;
}
.btn:hover { background: var(--red-ink); border-color: var(--red-ink); }
.btn.alt { background: transparent; color: var(--navy); border-color: var(--navy); }
.btn.alt:hover { background: var(--navy); color: #fff; }
.btn.light { background: #fff; color: var(--navy); border-color: #fff; }
.btn.light:hover { background: var(--bg); border-color: var(--bg); }
.btn.ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, 0.7); }
.btn.ghost:hover { background: #fff; color: var(--navy); border-color: #fff; }
.btn.small { padding: 9px 20px; font-size: 0.92rem; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

/* ---- Sections ---- */
section.block { padding: 80px 0; }
section.block.white { background: var(--paper); }
section.block.navy { background: var(--navy); color: #e8eef4; }
section.block.navy h2, section.block.navy h3 { color: #fff; }
.eyebrow { margin: 0 0 10px; font-size: 0.78rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--red); }
.navy .eyebrow { color: var(--yellow); }
section.block h2 { margin: 0 0 10px; font-size: clamp(1.9rem, 4.2vw, 2.7rem); line-height: 1.15; font-weight: 700; letter-spacing: -0.01em; }
.intro { margin: 0 0 36px; max-width: 62ch; color: var(--gray); font-size: 1.05rem; }
.navy .intro { color: #b9c8d6; }
@media (max-width: 560px) { section.block { padding: 56px 0; } }

/* ---- Hero ---- */
.hero {
  background-color: var(--bg);
  background-image: linear-gradient(rgba(15, 45, 70, 0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(15, 45, 70, 0.05) 1px, transparent 1px);
  background-size: 38px 38px;
  overflow: hidden;
}
.hero .wrap { display: grid; grid-template-columns: 1fr; gap: 44px; align-items: center; padding-top: 56px; padding-bottom: 72px; }
.hero h1 { margin: 0; font-size: clamp(2.5rem, 6.4vw, 4.4rem); line-height: 1.07; font-weight: 700; letter-spacing: -0.015em; }
.hero h1 em { font-style: normal; color: var(--red); background: linear-gradient(transparent 80%, rgba(242, 194, 48, 0.6) 80%); }
.hero .lead { margin: 22px 0 0; max-width: 50ch; font-size: 1.12rem; color: var(--gray); }
.stats { display: flex; flex-wrap: wrap; gap: 18px 38px; margin: 40px 0 0; padding: 0; list-style: none; }
.stats strong { display: block; font: 700 1.9rem/1.1 var(--serif); color: var(--navy); }
.stats span { display: block; margin-top: 3px; font-size: 0.82rem; line-height: 1.35; color: var(--gray); max-width: 15ch; }
@media (min-width: 900px) { .hero .wrap { grid-template-columns: 1.08fr 0.92fr; gap: 56px; padding-top: 72px; padding-bottom: 88px; } }

.portrait { position: relative; isolation: isolate; max-width: 520px; width: 100%; margin: 0 auto; }
.portrait::before { content: ""; position: absolute; inset: 22px -16px -16px 22px; border-radius: 30px; background: var(--yellow); z-index: -1; }
.portrait .dots { position: absolute; left: -22px; top: 26px; width: 44px; display: grid; grid-template-columns: 1fr 1fr; gap: 6px; z-index: 2; }
.portrait .dots i { display: block; aspect-ratio: 1; border-radius: 6px; }
.portrait .dots i:nth-child(1) { background: var(--red); }
.portrait .dots i:nth-child(2) { background: var(--yellow); }
.portrait .dots i:nth-child(3) { background: var(--green); }
.portrait .dots i:nth-child(4) { background: var(--sky); }
.portrait .frame { border-radius: 30px; overflow: hidden; background: var(--sky); }
.portrait img { display: block; width: 100%; height: auto; }
.portrait .cap { position: absolute; left: 16px; right: 16px; bottom: 16px; padding: 12px 18px; background: rgba(255, 255, 255, 0.96); border-radius: 16px; box-shadow: 0 8px 24px rgba(15, 45, 70, 0.18); }
.portrait .cap strong { display: block; font: 700 1.05rem/1.3 var(--serif); color: var(--navy); }
.portrait .cap span { display: block; font-size: 0.82rem; color: var(--gray); }

/* ---- Course cards ---- */
.courses { display: grid; grid-template-columns: 1fr; gap: 26px; }
@media (min-width: 880px) { .courses { grid-template-columns: 1fr 1fr; } }
.course { display: flex; flex-direction: column; background: var(--bg); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; }
.course .head { padding: 26px 28px 22px; background: var(--red); color: #fff; }
.course.blue .head { background: var(--blue); }
.course .head h3 { margin: 0; color: #fff; font-size: 1.55rem; line-height: 1.2; }
.course .head .when { margin: 6px 0 0; font-size: 0.95rem; color: rgba(255, 255, 255, 0.92); }
.course .body { display: flex; flex-direction: column; flex: 1; padding: 22px 28px 28px; }
.facts { margin: 0 0 18px; }
.facts div { padding: 10px 0; border-top: 1px solid var(--line); }
.facts div:first-child { border-top: 0; padding-top: 0; }
.facts dt { font-size: 0.74rem; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--gray); }
.facts dd { margin: 2px 0 0; }
.course h4 { margin: 4px 0 10px; font-size: 1.05rem; }
.course ul { margin: 0 0 26px; padding: 0; list-style: none; }
.course li { position: relative; padding: 0 0 8px 22px; }
.course li::before { content: ""; position: absolute; left: 0; top: 0.5em; width: 9px; height: 9px; border-radius: 50%; background: var(--red); }
.course.blue li::before { background: var(--blue); }
.course .btn { align-self: flex-start; margin-top: auto; }
.course.blue .btn { background: var(--blue); border-color: var(--blue); }
.course.blue .btn:hover { background: #135a85; border-color: #135a85; }
.fineprint { margin: 22px 0 0; max-width: 70ch; font-size: 0.9rem; color: var(--gray); }

/* ---- YouTube ---- */
.yt-grid { display: grid; grid-template-columns: 1fr; gap: 36px; align-items: center; }
@media (min-width: 900px) { .yt-grid { grid-template-columns: 0.9fr 1.1fr; gap: 56px; } }
.yt-grid p { margin: 0 0 18px; color: #c9d6e2; font-size: 1.05rem; max-width: 52ch; }
.ystats { display: flex; gap: 38px; margin: 24px 0 28px; padding: 0; list-style: none; }
.ystats strong { display: block; font: 700 2.2rem/1.1 var(--serif); color: #fff; }
.ystats span { display: block; font-size: 0.85rem; color: #b9c8d6; }
.player { position: relative; aspect-ratio: 16 / 9; background: var(--navy-2); border: 1px solid rgba(255, 255, 255, 0.14); border-radius: var(--r); overflow: hidden; }
.player iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.player button.play { position: absolute; inset: 0; width: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; background: transparent; border: 0; color: #fff; font: 500 1.05rem/1.3 var(--sans); cursor: pointer; }
.player button.play:hover .tri { background: var(--red-ink); }
.player .tri { width: 76px; height: 76px; border-radius: 50%; background: var(--red); display: grid; place-items: center; }
.player .tri svg { width: 28px; height: 28px; margin-left: 4px; fill: #fff; }

/* ---- Reviews ---- */
.reviews { display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 20px; align-items: start; }
.review { position: relative; margin: 0; background: var(--paper); border: 1px solid var(--line); border-radius: var(--r); padding: 54px 26px 24px; }
.review::before { content: "\201C"; position: absolute; left: 22px; top: 6px; font: 700 4.4rem/1 var(--serif); color: var(--red); }
.review:nth-child(3n+2)::before { color: var(--sky); }
.review:nth-child(3n)::before { color: var(--green); }
.review blockquote { margin: 0; font-size: 0.98rem; line-height: 1.65; }
.review figcaption { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); color: var(--gray); font-size: 0.88rem; }
.review figcaption strong { display: block; font-weight: 500; color: var(--navy); font-size: 0.98rem; }
.more { margin: 28px 0 0; }

/* ---- About ---- */
.about-grid { display: grid; grid-template-columns: 1fr; gap: 36px; align-items: start; }
@media (min-width: 900px) { .about-grid { grid-template-columns: 1.15fr 0.85fr; gap: 56px; } }
.about p { margin: 0 0 16px; max-width: 60ch; font-size: 1.05rem; }
.about p:last-child { margin-bottom: 0; }
.creds { margin: 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.creds li { background: var(--bg); border: 1px solid var(--line); border-left: 8px solid var(--red); border-radius: 16px; padding: 14px 18px; }
.creds li:nth-child(4n+2) { border-left-color: var(--yellow); }
.creds li:nth-child(4n+3) { border-left-color: var(--green); }
.creds li:nth-child(4n) { border-left-color: var(--sky); }
.creds strong { display: block; font-weight: 500; color: var(--navy); }
.creds span { display: block; margin-top: 2px; color: var(--gray); font-size: 0.9rem; line-height: 1.45; }

/* ---- Worksheet path cards and lists ---- */
.paths { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 20px; }
.path { display: flex; flex-direction: column; min-height: 200px; padding: 26px 24px 22px; border-radius: var(--r); text-decoration: none; color: #fff; transition: transform 0.15s, box-shadow 0.15s; }
.path:hover { transform: translateY(-4px); box-shadow: 0 14px 28px rgba(15, 45, 70, 0.16); }
.path h3 { margin: 0; color: inherit; font-size: 1.35rem; line-height: 1.2; }
.path p { margin: 8px 0 18px; font-size: 0.93rem; opacity: 0.94; }
.path .go { margin-top: auto; font-weight: 500; }
.path.p-red { background: var(--red); }
.path.p-blue { background: var(--blue); }
.path.p-green { background: var(--green); color: var(--ink); }
.path.p-yellow { background: var(--yellow); color: var(--ink); }
.path.p-green h3, .path.p-yellow h3 { color: var(--ink); }
.path:focus-visible { outline: 3px solid var(--navy); outline-offset: 3px; }

.list { display: grid; gap: 16px; }
.item { display: block; background: var(--paper); border: 1px solid var(--line); border-left: 8px solid var(--sky); border-radius: 16px; padding: 18px 22px; color: inherit; text-decoration: none; transition: transform 0.15s; }
.item:hover { transform: translateX(3px); }
.item strong { display: block; font: 700 1.15rem/1.3 var(--serif); color: var(--navy); }
.item span { display: block; margin-top: 3px; color: var(--gray); font-size: 0.95rem; }
.empty { background: var(--paper); border: 1px dashed #d7bcb6; border-radius: 16px; padding: 22px 24px; color: var(--gray); }
.empty p { margin: 0 0 8px; }
.empty p:last-child { margin-bottom: 0; }

.page-head { background-color: var(--bg); padding: 48px 0 8px; }
.page-head h1 { margin: 0 0 10px; font-size: clamp(2rem, 5vw, 3rem); line-height: 1.12; }
.crumbs { margin: 0 0 14px; font-size: 0.9rem; }
.crumbs a { color: var(--blue); }
.page-body { padding: 24px 0 72px; }
.page-body .intro { margin-bottom: 28px; }

/* ---- Join band ---- */
.join { background: var(--red); color: #fff; border-radius: 30px; padding: 48px 40px; display: grid; gap: 28px; align-items: center; }
@media (min-width: 900px) { .join { grid-template-columns: 1.1fr 0.9fr; padding: 56px 56px; } }
.join h2 { margin: 0 0 10px; color: #fff; }
.join p { margin: 0; max-width: 46ch; font-size: 1.05rem; color: rgba(255, 255, 255, 0.95); }
.join .actions { margin-top: 0; flex-direction: column; align-items: stretch; }
.join .actions .btn { text-align: center; }
.join .tel { margin: 14px 0 0; font-size: 0.95rem; }
.join .tel a { color: #fff; }
@media (max-width: 560px) { .join { padding: 34px 24px; border-radius: 24px; } }

/* ---- Footer ---- */
footer.site { background: var(--navy); color: #b9c8d6; padding: 56px 0 40px; font-size: 0.93rem; }
footer.site a { color: #dbe6f0; text-decoration: none; }
footer.site a:hover { text-decoration: underline; }
footer.site p { margin: 0 0 8px; max-width: 70ch; }
.foot-grid { display: grid; grid-template-columns: 1fr; gap: 30px; }
@media (min-width: 760px) { .foot-grid { grid-template-columns: 1.4fr 1fr 1fr; } }
.foot-brand { font: 700 1.3rem/1.3 var(--serif); color: #fff; }
.foot-tag { color: var(--yellow); }
.foot-h { font-size: 0.74rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: #8aa3b8; }
.foot-links { display: grid; gap: 6px; }
footer.site .foot-bar { max-width: none; margin: 36px 0 0; padding-top: 18px; border-top: 1px solid rgba(255, 255, 255, 0.14); font-size: 0.82rem; color: #8aa3b8; }

/* Mobile bar with the two actions that matter */
.sticky-cta { display: none; }
@media (max-width: 720px) {
  body.home { padding-bottom: 72px; }
  .sticky-cta { display: flex; gap: 10px; position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; padding: 10px 14px; background: #fff; border-top: 1px solid var(--line); box-shadow: 0 -6px 18px rgba(15, 45, 70, 0.1); }
  .sticky-cta .btn { flex: 1; text-align: center; padding: 11px 12px; font-size: 0.95rem; }
}

/* ---- Worksheet reader page ---- */
.reader-head { background: var(--paper); border-bottom: 1px solid var(--line); }
.reader-head .wrap { padding-top: 28px; padding-bottom: 26px; }
.reader-head h1 { margin: 0; font-size: 2.6rem; line-height: 1.1; font-weight: 700; letter-spacing: -0.01em; }
.reader-head .paper { margin: 8px 0 0; color: var(--gray); }
.back { display: inline-block; margin-bottom: 14px; font-size: 0.95rem; }

.jump { position: sticky; top: var(--hh, 84px); z-index: 5; background: var(--paper); border-bottom: 1px solid var(--line); }
.jump .wrap { display: flex; gap: 4px; overflow-x: auto; padding-top: 0; padding-bottom: 0; }
.jump a { flex: 0 0 auto; padding: 12px 14px 9px; color: var(--ink); text-decoration: none; font-weight: 500; font-size: 0.95rem; border-bottom: 3px solid transparent; }
.jump a:hover { border-bottom-color: var(--line); }
.jump a[aria-current="true"] { border-bottom-color: var(--red); }
.jump a:focus-visible { outline: 3px solid var(--sky); outline-offset: -3px; }

.sheets { padding: 24px 0 8px; }
.sheet { margin: 0 auto 24px; max-width: 920px; background: var(--paper); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; scroll-margin-top: 60px; position: relative; }
.sheet canvas {
  display: block;
  width: 100%;
  height: auto;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  pointer-events: none;
}
.sheet .fail { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; padding: 24px; text-align: center; color: var(--gray); }
.sheets + .print-note + footer.site { margin-top: 48px; padding: 28px 0; }

.print-note { display: none; }
@media print {
  .jump, .sheets, footer.site, .top, .sticky-cta { display: none; }
  .print-note { display: block; padding: 24px 0; font-size: 1.1rem; }
}

@media (max-width: 560px) {
  .hero .wrap { padding-top: 36px; padding-bottom: 56px; }
  .reader-head h1 { font-size: 2.1rem; }
  .portrait::before { inset: 16px -8px -10px 16px; }
  .portrait .dots { left: -8px; }
}

/* ---- Resources page ---- */
.res-h { margin: 36px 0 14px; font-size: 1.5rem; line-height: 1.25; }
.res-h:first-child { margin-top: 0; }
.item .tag { display: inline-block; margin: 0 0 6px; padding: 2px 10px; border-radius: 999px; background: #fde8e4; color: var(--red-ink); font-size: 0.72rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; }
.item .tag + strong { margin-top: 0; }

/* ---- Resource sub-headings ---- */
.res-sub { margin: 26px 0 12px; font-size: 1.08rem; color: var(--navy); }
.res-list { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }

/* ---- Testimonial quote marks: opening mark top-left (.review::before), closing mark after the text ---- */
.review blockquote::after { content: "\201D"; margin-left: 4px; font: 700 4.4rem/0 var(--serif); vertical-align: -0.5em; color: var(--red); }
.review:nth-child(3n+2) blockquote::after { color: var(--sky); }
.review:nth-child(3n) blockquote::after { color: var(--green); }

/* ---- Institution logos (home strip and About page) ----
   Logo files live in assets/logos/ and are listed in src/site_data.py (STUDIED, TAUGHT).
   Heights are set per logo so they look balanced; widths follow automatically. */
.trust { background: var(--paper); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.trust .wrap { display: grid; gap: 16px 64px; padding-top: 26px; padding-bottom: 26px; }
@media (min-width: 900px) { .trust .wrap { grid-template-columns: auto 1fr; } }
.trust-label { margin: 0 0 8px; font-size: 0.74rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--gray); }
.logos { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 34px; margin: 0; padding: 0; list-style: none; }
@media (min-width: 900px) { .trust-row:last-child .logos { justify-content: space-between; } }
.logos li { font: 600 1rem/1.4 var(--serif); color: var(--navy); }   /* text fallback when a logo file is missing */
.logos li.logo { display: flex; align-items: center; }
.logos li.logo img { display: block; width: auto; height: 40px; }
.logos li.logo.logo-imperial img { height: 42px; }
.logos li.logo.logo-lgs img { height: 54px; }
.logos li.logo.logo-trinity img { height: 72px; }
.logos li.logo.logo-city img { height: 70px; }
.logos li.logo.logo-isl img { height: 44px; }
.logos li.logo.logo-itu img { height: 56px; }
@media (max-width: 600px) {
  .logos { gap: 12px 24px; }
  .logos li.logo img { height: 32px; }
  .logos li.logo.logo-imperial img { height: 34px; }
  .logos li.logo.logo-lgs img { height: 44px; }
  .logos li.logo.logo-trinity img { height: 58px; }
  .logos li.logo.logo-city img { height: 56px; }
  .logos li.logo.logo-isl img { height: 36px; }
  .logos li.logo.logo-itu img { height: 46px; }
}

/* ---- About page: teacher band, highlight numbers, two-column text, credential grid ---- */
.teacher { background: var(--navy); color: #e8eef4; }
.teacher .wrap { max-width: var(--wrap); }
.teacher .wrap:first-child { display: grid; gap: 40px; align-items: center; padding-top: 56px; padding-bottom: 32px; }
@media (min-width: 900px) { .teacher .wrap:first-child { grid-template-columns: 1.1fr 0.9fr; gap: 64px; padding-top: 72px; } }
.teacher .eyebrow { color: var(--yellow); }
.teacher h1 { margin: 0 0 16px; color: #fff; font-size: clamp(2.2rem, 5.4vw, 3.6rem); line-height: 1.08; letter-spacing: -0.01em; }
.teacher .lead { margin: 0; max-width: 52ch; font-size: 1.12rem; color: #c9d6e2; }
.teacher .portrait { max-width: 400px; }
.teacher .portrait::before { background: var(--red); }
.big-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin: 0; padding: 0 0 56px; list-style: none; }
@media (min-width: 760px) { .big-stats { grid-template-columns: repeat(4, 1fr); gap: 18px; } }
.big-stats li { padding: 22px 20px; border-radius: 20px; background: rgba(255, 255, 255, 0.07); border: 1px solid rgba(255, 255, 255, 0.14); }
.big-stats strong { display: block; font: 700 clamp(1.7rem, 3.4vw, 2.4rem)/1.1 var(--serif); color: var(--yellow); }
.big-stats span { display: block; margin-top: 6px; font-size: 0.9rem; color: #c9d6e2; }
.split { display: grid; gap: 20px; align-items: start; }
@media (min-width: 900px) { .split { grid-template-columns: 0.8fr 1.2fr; gap: 56px; } }
.split h2 { margin: 0; }
.inst { margin: 28px 0 8px; }
.creds-grid { margin-top: 32px; }
@media (min-width: 760px) { .creds-grid { grid-template-columns: repeat(2, 1fr); } }

/* ---- Worldwide line in the hero ---- */
.world { display: flex; align-items: center; gap: 8px; margin: 18px 0 0; font-size: 0.92rem; font-weight: 500; color: var(--navy); }
.world svg { flex: none; color: var(--blue); }

/* ---- FAQ ---- */
.faq { display: grid; gap: 12px; }
.faq details { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; padding: 0 22px; }
.faq details[open] { border-color: var(--sky); }
.faq summary { cursor: pointer; list-style: none; padding: 18px 28px 18px 0; position: relative; font: 700 1.05rem/1.4 var(--serif); color: var(--navy); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 0; top: 50%; transform: translateY(-50%); font: 500 1.5rem/1 var(--sans); color: var(--red); }
.faq details[open] summary::after { content: "\2212"; }
.faq details p { margin: 0 0 18px; max-width: 62ch; color: var(--gray); }

/* ---- Study guides ---- */
.byline { margin: 0 0 12px; color: var(--gray); font-size: 0.95rem; }
.guide { font-size: 1.05rem; }
.guide .g-lead { margin: 0 0 8px; font-size: 1.15rem; color: var(--gray); }
.guide h2 { margin: 40px 0 12px; font-size: 1.55rem; line-height: 1.25; }
.guide h3 { margin: 26px 0 8px; font-size: 1.2rem; }
.guide p, .guide li { max-width: 68ch; }
.guide p { margin: 0 0 16px; }
.guide ul, .guide ol { margin: 0 0 18px; padding-left: 1.3em; }
.guide li { margin-bottom: 6px; }
.g-table { overflow-x: auto; margin: 0 0 18px; border: 1px solid var(--line); border-radius: 14px; background: var(--paper); }
.g-table table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.g-table th, .g-table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--line); white-space: nowrap; }
.g-table th { background: var(--navy); color: #fff; font-weight: 500; font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase; }
.g-table tr:last-child td { border-bottom: 0; }
.g-eg { margin: 0 0 18px; padding: 16px 20px; background: var(--paper); border: 1px solid var(--line); border-left: 8px solid var(--yellow); border-radius: 14px; }
.g-eg p:last-child, .g-eg ul:last-child { margin-bottom: 0; }
.g-eg ul { margin-top: 8px; }
.g-links { margin: 36px 0 0; padding: 20px 24px; background: var(--paper); border: 1px solid var(--line); border-left: 8px solid var(--sky); border-radius: 16px; }
.guide .g-links h2 { margin: 0 0 8px; font-size: 1.15rem; }
.g-links ul { margin: 0; }
.g-cta { margin: 44px 0 0; padding: 30px 28px; background: var(--navy); color: #e8eef4; border-radius: 24px; }
.g-cta h2 { margin: 0 0 8px; color: #fff; font-size: 1.5rem; }
.g-cta p { margin: 0 0 18px; max-width: 58ch; }
.g-cta .actions { margin-top: 0; }
.g-more { margin: 36px 0 0; }
.g-more h2 { margin: 0 0 8px; font-size: 1.2rem; }
.g-more ul { margin: 0; padding-left: 1.3em; }
.g-more li { margin-bottom: 6px; }

/* ---- Video pages ---- */
.player.vid { margin: 0 0 12px; }
.g-note { margin: 0 0 16px; color: var(--gray); font-size: 0.95rem; }
.chapters { list-style: none; margin: 0 0 20px; padding: 0; display: grid; gap: 8px; }
.chapters li { margin: 0; max-width: none; }
.chapters button { display: flex; align-items: center; gap: 14px; width: 100%; text-align: left; padding: 12px 16px; background: var(--paper); border: 1px solid var(--line); border-left: 6px solid var(--sky); border-radius: 12px; font: 500 1rem/1.3 var(--sans); color: var(--navy); cursor: pointer; }
.chapters button:hover { border-left-color: var(--red); background: var(--bg); }
.chapters .ts { flex: none; min-width: 4.2em; padding: 2px 8px; border-radius: 999px; background: #e6f3fa; color: var(--blue); font-size: 0.82rem; text-align: center; font-variant-numeric: tabular-nums; }

/* ---- Video thumbnail and chapter summaries ---- */
.player .thumb { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.player .thumb + button.play { background: rgba(15, 45, 70, 0.35); text-shadow: 0 1px 6px rgba(0, 0, 0, 0.6); }
.player .thumb + button.play:hover { background: rgba(15, 45, 70, 0.2); }
.chapters button { align-items: flex-start; }
.chapters .ts { margin-top: 3px; }
.chapters .ct { display: block; }
.chapters .ct strong { display: block; font-weight: 500; }
.chapters .ct span { display: block; margin-top: 2px; font-weight: 400; font-size: 0.9rem; line-height: 1.45; color: var(--gray); }

/* ---- Quiz ---- */
.chapters li { display: flex; gap: 8px; align-items: stretch; }
.chapters li button { flex: 1 1 auto; }
.qlink { flex: none; align-self: center; padding: 8px 14px; border-radius: 999px; background: var(--navy); color: #fff; font-size: 0.85rem; font-weight: 500; text-decoration: none; }
.qlink:hover { background: var(--red); color: #fff; }
@media (max-width: 560px) { .chapters li { flex-wrap: wrap; } .qlink { margin-left: 6px; } }
.quiz { margin: 44px 0 0; padding: 28px 24px; background: var(--paper); border: 1px solid var(--line); border-radius: 24px; scroll-margin-top: calc(var(--hh, 84px) + 12px); }
.quiz h2 { margin: 0 0 6px; font-size: 1.6rem; }
.q-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 18px; }
.q-tab { padding: 8px 14px; border-radius: 999px; border: 1.5px solid var(--line); background: var(--bg); color: var(--navy); font: 500 0.88rem/1.25 var(--sans); cursor: pointer; text-align: left; }
.q-tab:hover { border-color: var(--sky); }
.q-tab[aria-selected="true"] { background: var(--navy); border-color: var(--navy); color: #fff; }
.q-card { min-height: 260px; padding: 20px; background: var(--bg); border-radius: 18px; }
.q-count { margin: 0 0 8px; font-size: 0.85rem; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; color: var(--gray); }
.q-bar { height: 6px; border-radius: 999px; background: var(--line); margin: 0 0 18px; overflow: hidden; }
.q-bar i { display: block; height: 100%; background: var(--green); }
.q-text { margin: 0 0 16px; font: 700 1.2rem/1.45 var(--serif); color: var(--navy); white-space: pre-line; }
.q-opts { display: grid; gap: 10px; }
.q-opt { display: flex; gap: 12px; align-items: flex-start; width: 100%; padding: 12px 14px; text-align: left; background: var(--paper); border: 2px solid var(--line); border-radius: 14px; font: 500 1rem/1.4 var(--sans); color: var(--ink); cursor: pointer; }
.q-opt:hover:not(:disabled) { border-color: var(--sky); }
.q-opt:disabled { cursor: default; }
.q-let { flex: none; width: 1.7em; height: 1.7em; display: grid; place-items: center; border-radius: 50%; background: var(--bg); font-size: 0.85rem; font-weight: 700; color: var(--navy); }
.q-opt.right { border-color: var(--green); background: #f2f8e2; }
.q-opt.wrong { border-color: var(--red); background: #fdeeea; }
.q-fb { margin-top: 16px; }
.q-ok, .q-no { margin: 0 0 6px; font-weight: 700; }
.q-ok { color: #5b7a10; }
.q-no { color: var(--red-ink); }
.q-why { margin: 0 0 14px; color: var(--gray); white-space: pre-line; }
.q-score { margin: 0 0 8px; font: 700 2.4rem/1.1 var(--serif); color: var(--navy); }
.q-actions { display: flex; flex-wrap: wrap; gap: 10px; }
@media (max-width: 560px) { .quiz { padding: 22px 14px; border-radius: 20px; } .q-card { padding: 14px; } }

/* ---- Resources: complete revision videos in two columns (P1 and M1 on the left, S1 and P3 on the right) ---- */
@media (min-width: 700px) {
  .res-list.complete { grid-template-columns: 1fr 1fr; grid-template-rows: repeat(2, auto); grid-auto-flow: column; }
}
@media (max-width: 699px) {
  .res-list.complete { grid-template-columns: 1fr; }
}

/* ---- Quiz: question strip, navigation, concept tag ---- */
.q-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 0 0 10px; }
.q-head .q-count { margin: 0; }
.q-tag { padding: 2px 10px; border-radius: 999px; background: #e3f1fa; color: #135a85; font-size: 0.72rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; }
.q-strip { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 18px; }
.q-dot { min-width: 32px; height: 32px; padding: 0 6px; border-radius: 999px; border: 1.5px solid var(--line); background: var(--paper); color: var(--navy); font: 500 0.8rem/1 var(--sans); cursor: pointer; }
.q-dot:hover { border-color: var(--sky); }
.q-dot.ok { background: #f2f8e2; border-color: var(--green); }
.q-dot.no { background: #fdeeea; border-color: var(--red); }
.q-dot.cur { background: var(--navy); border-color: var(--navy); color: #fff; }
.q-nav { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 16px; }
.q-nav .btn:disabled { opacity: 0.4; cursor: default; }
.q-nav .btn:disabled:hover { background: transparent; color: var(--navy); border-color: var(--navy); }
.q-finish { margin-left: auto; background: none; border: 0; padding: 8px 4px; color: var(--gray); font: 500 0.9rem/1 var(--sans); text-decoration: underline; cursor: pointer; }
.q-finish:hover { color: var(--navy); }
.q-tab.q-mix { border-style: dashed; }
.q-tab.q-mix[aria-selected="true"] { border-style: solid; }

/* P3 page: three videos on one page */
.part-jump { margin: 0 0 8px; font-weight: 600; }
.part-jump a { color: var(--blue); }
.vpart { margin: 34px 0 0; scroll-margin-top: 90px; }
.vpart h2 { margin: 0 0 12px; }
.vpart .player.vid { margin: 0 0 14px; }

.support { margin: 44px 0 0; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted, #5b6b78); font-size: 0.95rem; }

/* Playlist pages: every video in a collapsed row that opens to its player */
.pl-intro { margin: 0 0 12px; }
.pl-yt { margin: 0 0 22px; }
.vtools { margin: 0 0 16px; }
.vf { display: block; }
.vf span { display: block; margin: 0 0 6px; font-weight: 600; font-size: 0.95rem; color: var(--navy); }
.vf input { width: 100%; padding: 12px 16px; font: 400 1rem/1.3 var(--sans); color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: 12px; }
.vf input:focus-visible { outline: 3px solid var(--sky); outline-offset: 2px; }
.vcount { display: block; margin: 8px 0 0; min-height: 1.2em; color: var(--muted, #5b6b78); font-size: 0.92rem; }
.vlist { list-style: none; margin: 0 0 8px; padding: 0; display: grid; gap: 8px; }
.vlist li { margin: 0; max-width: none; }
.vlist li[hidden] { display: none; }
.vitem { background: var(--paper); border: 1px solid var(--line); border-left: 6px solid var(--sky); border-radius: 12px; scroll-margin-top: calc(var(--hh, 84px) + 12px); }
.vitem[open] { border-left-color: var(--red); }
.vitem summary { display: flex; align-items: center; gap: 14px; padding: 13px 16px; cursor: pointer; list-style: none; font: 500 1rem/1.35 var(--sans); color: var(--navy); }
.vitem summary::-webkit-details-marker { display: none; }
.vitem summary::after { content: ""; flex: none; width: 10px; height: 10px; margin-left: auto; border-right: 2px solid var(--navy); border-bottom: 2px solid var(--navy); transform: rotate(45deg); transition: transform 0.15s; }
.vitem[open] summary::after { transform: rotate(-135deg); }
.vitem summary:hover { background: var(--bg); border-radius: 0 12px 12px 0; }
.vitem summary:focus-visible { outline: 3px solid var(--sky); outline-offset: -3px; }
.vn { flex: none; min-width: 2.4em; padding: 2px 8px; border-radius: 999px; background: #e6f3fa; color: var(--blue); font-size: 0.82rem; text-align: center; font-variant-numeric: tabular-nums; }
.vt { flex: 1; }
.vbody { padding: 4px 16px 16px; }
.vbody .player.vid { margin: 0 0 10px; }
.vyt { font-size: 0.92rem; }
.vc { flex: none; font-size: 0.8rem; color: var(--muted, #5b6b78); white-space: nowrap; }
.vitem summary .vc { margin-left: auto; }
.vitem summary .vc + * { margin-left: 0; }
.vone + .vone { margin-top: 22px; padding-top: 18px; border-top: 1px dashed var(--line); }
.vpart-h { margin: 0 0 10px; font: 600 1rem/1.3 var(--sans); color: var(--red-ink, #a52c1a); }
.pl-ytlink { display: inline-block; padding: 9px 20px; border: 2px solid var(--navy); border-radius: 999px; color: var(--navy); text-decoration: none; font: 500 0.95rem/1.3 var(--sans); }
.pl-ytlink:hover { background: var(--navy); color: #fff; }