/* Public Green Book page. */
.gb { --gb-dark: #013b2e; --gb-green: #006b50; --gb-gold: #b98224; --gb-mint: #e3f4ea; --gb-ink: #14312b; --gb-muted: #50675a; --gb-line: #dce6df; color: var(--gb-ink); padding-bottom: 3rem; }
.gb-hero { background: radial-gradient(120% 140% at 100% 0%, #0b6a4f 0%, var(--gb-dark) 60%); color: #fff; overflow: hidden; }
.gb-hero-grid { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, .8fr); gap: 2.5rem; align-items: center; padding-top: 3rem; padding-bottom: 3rem; }
.gb-eyebrow { font-size: .72rem; font-weight: 800; letter-spacing: .16em; color: #e7c27a; }
.gb-hero h1 { font: 700 clamp(2.4rem, 5vw, 4rem)/1.05 Georgia, serif; margin-top: .4rem; color: #fff; }
.gb-lead { margin-top: 1rem; max-width: 36rem; font-size: 1.05rem; line-height: 1.65; color: #d7efe3; }
.gb-actions { display: flex; flex-wrap: wrap; gap: .7rem; align-items: center; margin-top: 1.6rem; }
.gb-btn { display: inline-flex; align-items: center; gap: .5rem; min-height: 48px; padding: .7rem 1.2rem; border-radius: 12px; background: #e7c27a; color: var(--gb-dark); font-weight: 800; text-decoration: none; border: 0; }
.gb-btn small { font-weight: 600; opacity: .75; }
.gb-btn-light { background: #fff; }
.gb-link { color: #fff; font-weight: 700; text-decoration: underline; text-underline-offset: 3px; min-height: 44px; display: inline-flex; align-items: center; }
.gb-facts { display: flex; flex-wrap: wrap; gap: 1.6rem; margin-top: 1.8rem; color: #cde8db; font-size: .9rem; }
.gb-facts strong { display: block; font: 700 1.6rem/1 Georgia, serif; color: #fff; }
.gb-cover { justify-self: center; display: block; width: min(330px, 100%); border-radius: 12px; overflow: hidden; box-shadow: 0 24px 60px #0008; transform: rotate(2deg); transition: transform .2s ease; }
.gb-cover:hover { transform: rotate(0deg) translateY(-4px); }
.gb-cover img { display: block; width: 100%; height: auto; }
.gb h2 { font: 700 clamp(1.5rem, 2.6vw, 2rem)/1.2 Georgia, serif; color: var(--gb-dark); }
.gb-how { padding-top: 2.5rem; }
.gb-steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .9rem; margin-top: 1rem; }
.gb-steps li { display: flex; gap: .8rem; padding: 1rem; border: 1px solid var(--gb-line); border-radius: 16px; background: #fff; }
.gb-steps span { display: grid; place-items: center; flex: 0 0 auto; width: 34px; height: 34px; border-radius: 50%; background: var(--gb-mint); color: var(--gb-green); font-weight: 800; }
.gb-steps p { margin-top: .25rem; font-size: .88rem; color: var(--gb-muted); line-height: 1.5; }
.gb-steps a { color: var(--gb-green); font-weight: 700; text-decoration: underline; }
.gb-lessons { padding-top: 2.5rem; }
.gb-lessons-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.gb-search { display: flex; align-items: center; gap: .5rem; min-height: 46px; padding: 0 .8rem; border: 1px solid var(--gb-line); border-radius: 12px; background: #fff; color: var(--gb-muted); flex: 0 1 380px; }
.gb-search input { flex: 1; min-width: 0; border: 0; outline: 0; background: transparent; font-size: .95rem; color: var(--gb-ink); }
.gb-chapter { margin-top: 1.6rem; }
.gb-chapter[hidden], .gb-grid li[hidden] { display: none; }
.gb-chapter h3 { display: flex; align-items: center; gap: .6rem; font: 700 1.15rem/1.3 Georgia, serif; color: var(--gb-dark); margin-bottom: .7rem; }
.gb-chapter h3 span { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; background: var(--gb-dark); color: #e7c27a; font: 800 .85rem/1 system-ui, sans-serif; }
.gb-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: .8rem; }
.gb-card { color: inherit; text-decoration: none; display: flex; gap: .8rem; width: 100%; padding: .6rem; border: 1px solid var(--gb-line); border-radius: 14px; background: #fff; text-align: left; cursor: pointer; transition: border-color .15s, box-shadow .15s, transform .15s; }
.gb-card:hover, .gb-card:focus-visible { border-color: var(--gb-green); box-shadow: 0 8px 22px #004a3514; transform: translateY(-2px); }
.gb-card img { width: 72px; height: 104px; object-fit: cover; object-position: top; border-radius: 8px; border: 1px solid var(--gb-line); flex: 0 0 auto; }
.gb-card-body { display: flex; flex-direction: column; gap: .3rem; min-width: 0; }
.gb-card-no { font-size: .72rem; font-weight: 700; letter-spacing: .04em; color: var(--gb-gold); text-transform: uppercase; }
.gb-card strong { font-size: .95rem; line-height: 1.35; color: var(--gb-ink); }
.gb-card-open { margin-top: auto; font-size: .82rem; font-weight: 700; color: var(--gb-green); }
.gb-empty { margin-top: 1rem; color: var(--gb-muted); }
.gb-download { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 3rem; padding: 1.6rem 1.8rem; border-radius: 20px; background: var(--gb-mint); }
.gb-download p { margin-top: .4rem; color: var(--gb-muted); max-width: 38rem; }
.gb-download .gb-btn { background: var(--gb-dark); color: #fff; }
@media (max-width: 900px) {
    .gb-hero-grid { grid-template-columns: minmax(0, 1fr); padding-top: 2rem; padding-bottom: 2rem; }
    .gb-cover { width: 220px; transform: none; }
    .gb-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 520px) {
    .gb-steps { grid-template-columns: minmax(0, 1fr); }
    .gb-actions .gb-btn { width: 100%; justify-content: center; }
}

/* Green Book reader: one HD page with the teacher's notes typed beside it. */
.gbr { --gbr-text: 1; --gbr-round: ui-rounded, "Nunito", "Segoe UI Rounded", "SF Pro Rounded", system-ui, sans-serif; background: linear-gradient(180deg, #f2faf5 0%, #fffaf0 100%); padding-bottom: 0; min-height: 100dvh; }
.gbr:fullscreen { overflow: auto; }
.gbr-top { position: sticky; top: 0; z-index: 20; background: var(--gb-dark); color: #fff; box-shadow: 0 6px 18px #0003; }
.gbr-top-inner { display: flex; align-items: center; gap: 1rem; max-width: 1400px; margin: 0 auto; padding: .6rem 1rem; }
.gbr-back { flex: 0 0 auto; display: inline-flex; align-items: center; gap: .35rem; min-height: 44px; padding: 0 .9rem; border-radius: 999px; background: #ffffff1a; color: #fff; font: 700 .9rem var(--gbr-round); text-decoration: none; }
.gbr-back:hover { background: #ffffff2e; }
.gbr-where { flex: 1; min-width: 0; }
.gbr-chapter { display: block; font: 800 .7rem/1.2 var(--gbr-round); letter-spacing: .08em; text-transform: uppercase; color: #e7c27a; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.gbr-where h1 { font: 800 clamp(1rem, 2.2vw, 1.35rem)/1.25 var(--gbr-round); color: #fff; margin-top: .1rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.gbr-count { flex: 0 0 auto; display: flex; align-items: baseline; gap: .2rem; padding: .35rem .8rem; border-radius: 14px; background: #e7c27a; color: var(--gb-dark); font-family: var(--gbr-round); }
.gbr-count strong { font-size: 1.35rem; font-weight: 900; }
.gbr-count span { font-size: .8rem; font-weight: 700; }
.gbr-progress { height: 6px; background: #ffffff22; }
.gbr-progress span { display: block; height: 100%; background: linear-gradient(90deg, #f6d27a, #7fdcaa); border-radius: 0 6px 6px 0; }
.gbr-layout { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(300px, 1fr); gap: 1.25rem; max-width: 1400px; margin: 0 auto; padding: 1.1rem 1rem; align-items: start; }
.gbr-page { background: #fff; border-radius: 22px; box-shadow: 0 12px 34px #004a3518; overflow: hidden; border: 1px solid var(--gb-line); }
.gbr-tools { display: flex; align-items: center; gap: .6rem; padding: .55rem .7rem; border-bottom: 1px solid var(--gb-line); background: #fbfdfb; }
.gbr-hd { padding: .2rem .5rem; border-radius: 7px; background: var(--gb-dark); color: #e7c27a; font: 900 .72rem/1.2 var(--gbr-round); letter-spacing: .06em; }
.gbr-bookpage { font: 700 .85rem var(--gbr-round); color: var(--gb-muted); margin-right: auto; }
.gbr-zoom { display: flex; gap: .3rem; }
.gbr-zoom button, .gbr-full, .gbr-size button { min-width: 44px; height: 44px; padding: 0 .6rem; border-radius: 12px; border: 1px solid var(--gb-line); background: #fff; color: var(--gb-dark); font: 800 1.1rem var(--gbr-round); cursor: pointer; }
.gbr-zoom .gbr-zoom-fit { font-size: .85rem; }
.gbr-zoom button:hover, .gbr-full:hover, .gbr-size button:hover { border-color: var(--gb-green); background: var(--gb-mint); }
.gbr-scroll { overflow: auto; max-height: calc(100dvh - 190px); -webkit-overflow-scrolling: touch; overscroll-behavior: contain; }
.gbr-scroll img { display: block; width: 100%; max-width: none; height: auto; }
.gbr:not(.gbr-zoomed) .gbr-scroll img { cursor: zoom-in; }
.gbr-zoomed .gbr-scroll { cursor: grab; }
.gbr-notes { position: sticky; top: 92px; display: flex; flex-direction: column; gap: .8rem; padding: 1.1rem; border-radius: 22px; background: #fff; border: 1px solid var(--gb-line); box-shadow: 0 12px 34px #004a3512; font-family: var(--gbr-round); max-height: calc(100dvh - 110px); overflow: auto; }
.gbr-notes-head { display: flex; align-items: center; justify-content: space-between; gap: .6rem; }
.gbr-notes h2 { font: 900 1.25rem/1.2 var(--gbr-round); color: var(--gb-dark); }
.gbr-size { display: flex; gap: .3rem; }
.gbr-size button { font-size: .85rem; }
.gbr-heading { padding: .9rem 1rem; border-radius: 16px; background: var(--gb-dark); color: #fff; font-weight: 900; font-size: calc(1.25rem * var(--gbr-text)); line-height: 1.35; }
.gbr-heading .gbr-mark { background: #e7c27a; color: var(--gb-dark); }
.gbr-list { display: flex; flex-direction: column; gap: .6rem; }
.gbr-note { position: relative; padding: .85rem 1rem .85rem 1.15rem; border-radius: 16px; border-left: 6px solid; font-size: calc(1.12rem * var(--gbr-text)); line-height: 1.5; font-weight: 700; color: #1d2b26; }
.gbr-note-text { white-space: pre-line; }
.gbr-sun { background: #fff6d8; border-color: #f2b632; }
.gbr-sky { background: #e3f2ff; border-color: #4a9be8; }
.gbr-rose { background: #ffe7ee; border-color: #e5648b; }
.gbr-leaf { background: #e4f7ea; border-color: #2fa66a; }
.gbr-grape { background: #f0e8ff; border-color: #8a63d2; }
.gbr-repeat { display: block; margin-top: .4rem; font-size: .8rem; font-weight: 800; color: #8a5a00; }
.gbr-mark { display: inline-block; padding: 0 .45rem; margin: 0 .1rem; border-radius: 999px; background: #fff; border: 2px dashed currentColor; font-size: .75em; font-weight: 800; line-height: 1.5; vertical-align: .08em; white-space: nowrap; }
.gbr-none { padding: 1rem; border-radius: 16px; background: var(--gb-mint); font-weight: 700; font-size: calc(1.05rem * var(--gbr-text)); }
.gbr-about { font-size: .8rem; line-height: 1.5; color: var(--gb-muted); font-weight: 600; }
.gbr-about .gbr-mark { color: var(--gb-muted); }
.gbr-done { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; min-height: 52px; border-radius: 16px; border: 2px solid #f2b632; background: #fffaf0; color: #7a4e00; font: 900 1rem var(--gbr-round); cursor: pointer; }
.gbr-done span:first-child { font-size: 1.4rem; }
.gbr-done.is-done { background: #f2b632; color: #3d2600; }
.gbr-nav { position: sticky; bottom: 0; z-index: 15; display: grid; grid-template-columns: 1fr 1fr; gap: .7rem; max-width: 1400px; margin: 0 auto; padding: .7rem 1rem calc(.7rem + env(safe-area-inset-bottom)); background: linear-gradient(180deg, #fffaf000, #fffaf0 30%); }
.gbr-nav-btn { display: flex; align-items: center; gap: .7rem; min-height: 64px; padding: .5rem 1rem; border-radius: 18px; background: #fff; border: 2px solid var(--gb-line); color: var(--gb-dark); text-decoration: none; font: 800 .95rem/1.25 var(--gbr-round); box-shadow: 0 6px 16px #004a3514; min-width: 0; }
.gbr-nav-btn > span[aria-hidden] { font-size: 2rem; line-height: 1; flex: 0 0 auto; }
.gbr-nav-btn span:not([aria-hidden]) { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.gbr-nav-btn small { display: block; font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--gb-gold); }
.gbr-nav-next { justify-content: flex-end; text-align: right; background: var(--gb-green); border-color: var(--gb-green); color: #fff; }
.gbr-nav-next small { color: #f6d27a; }
.gbr-nav-btn:hover { transform: translateY(-1px); }
.gbr-foot { padding: .5rem 1rem 1.5rem; font-size: .85rem; color: var(--gb-muted); text-align: center; }
.gbr-foot a { color: var(--gb-green); font-weight: 700; text-decoration: underline; }
.gbr-jump { display: none; align-items: center; min-height: 44px; padding: 0 .7rem; border-radius: 12px; background: #f2b632; color: #3d2600; font: 900 .85rem var(--gbr-round); text-decoration: none; white-space: nowrap; }
/* iPad portrait and phones: page on top, notes underneath. */
@media (max-width: 999px) {
    .gbr-jump { display: inline-flex; }
    .gbr-notes h2 { scroll-margin-top: 96px; }
    .gbr-layout { grid-template-columns: minmax(0, 1fr); padding: .7rem; gap: .8rem; }
    .gbr-notes { position: static; max-height: none; }
    .gbr-scroll { max-height: none; }
    .gbr-zoomed .gbr-scroll { max-height: 75dvh; }
}
@media (max-width: 560px) {
    .gbr-top-inner { gap: .5rem; padding: .5rem .7rem; }
    .gbr-back { padding: 0 .7rem; font-size: 0; gap: 0; }
    .gbr-back span { font-size: 1.2rem; }
    .gbr-page, .gbr-notes { border-radius: 16px; }
    .gbr-bookpage, .gbr-full { display: none; }
    .gbr-tools { gap: .4rem; }
    .gbr-nav-btn { min-height: 58px; padding: .4rem .7rem; font-size: .85rem; }
    .gbr-nav-btn span:not([aria-hidden]) { white-space: normal; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
}
/* Index additions: reading progress stars. */
.gb-card-star { margin-left: .3rem; color: #f2b632; }

/* Highlighter: marker strokes over the page and coloured notes. */
.gbr { --gbr-pen: #ffd42a; }
.gbr-sheet { position: relative; width: 100%; margin: 0 auto; }
.gbr-ink { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; mix-blend-mode: multiply; }
.gbr-ink path { fill: none; stroke-width: 24; stroke-linecap: round; stroke-linejoin: round; opacity: .42; }
.gbr-highlighting .gbr-ink { pointer-events: auto; touch-action: none; cursor: crosshair; }
.gbr-hl { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; padding: .55rem .7rem; border-bottom: 1px solid var(--gb-line); background: #fffdf6; font-family: var(--gbr-round); }
.gbr-hl button { min-height: 44px; padding: 0 .75rem; border-radius: 12px; border: 1px solid var(--gb-line); background: #fff; color: var(--gb-dark); font: 800 .85rem var(--gbr-round); cursor: pointer; }
.gbr-hl button:disabled { opacity: .45; cursor: default; }
.gbr-hl-toggle[aria-pressed="true"] { background: var(--gbr-pen); border-color: #0002; color: #1d2b26; box-shadow: inset 0 -3px 0 #0002; }
.gbr-hl-tools { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem; }
.gbr-hl-tools[hidden] { display: none; }
.gbr-hl-colors { display: flex; gap: .35rem; padding: .2rem; border-radius: 999px; background: #f3f1e8; }
.gbr-hl .gbr-swatch { width: 38px; min-width: 38px; height: 38px; min-height: 38px; padding: 0; border-radius: 50%; border: 3px solid #fff; box-shadow: 0 0 0 1px #0002; }
.gbr-hl .gbr-swatch[aria-checked="true"] { box-shadow: 0 0 0 3px var(--gb-dark); transform: scale(1.08); }
.gbr-swatch-0 { background: #ffd42a !important; }
.gbr-swatch-1 { background: #4cd47a !important; }
.gbr-swatch-2 { background: #45a6ff !important; }
.gbr-swatch-3 { background: #ff6fa8 !important; }
.gbr-swatch-4 { background: #ff9a3c !important; }
.gbr-hl-share { display: flex; gap: .4rem; margin-left: auto; }
.gbr-hl-link { flex: 1 0 100%; min-height: 44px; padding: 0 .7rem; border-radius: 12px; border: 2px solid var(--gb-green); font: 600 .85rem system-ui, sans-serif; }
.gbr-hl-link[hidden] { display: none; }
.gbr-hl-banner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .6rem; padding: .7rem .9rem; background: linear-gradient(90deg, #fff6d8, #e3f2ff, #ffe7ee); font: 700 .9rem/1.4 var(--gbr-round); color: #1d2b26; }
.gbr-hl-banner[hidden] { display: none; }
.gbr-hl-banner div { display: flex; gap: .4rem; }
.gbr-hl-banner button { min-height: 44px; padding: 0 .8rem; border-radius: 12px; border: 0; background: var(--gb-dark); color: #fff; font: 800 .85rem var(--gbr-round); cursor: pointer; }
.gbr-hl-banner button + button { background: #fff; color: var(--gb-dark); border: 1px solid var(--gb-line); }
.gbr-highlighting .gbr-note { cursor: pointer; }
.gbr-highlighting .gbr-note:hover { outline: 3px dashed var(--gbr-pen); outline-offset: 2px; }
.gbr-note.is-marked .gbr-note-text { background: linear-gradient(transparent 12%, color-mix(in srgb, var(--gbr-marker) 55%, transparent) 12%, color-mix(in srgb, var(--gbr-marker) 55%, transparent) 92%, transparent 92%); box-decoration-break: clone; -webkit-box-decoration-break: clone; border-radius: 4px; padding: 0 .15rem; }
@media (max-width: 560px) {
    .gbr-hl-share { margin-left: 0; width: 100%; }
    .gbr-hl-share button { flex: 1; }
}