/* BB School Worksheets: front-end app.
   Design: BORIL BOGOEV design system. White page, black type, one red accent.
   Author: Boril Bogoev, Ph.D. · https://www.borilbogoev.online */

:root {
  --brand: #C72C2C; --brand-hover: #A82424; --brand-text: #C72C2C;
  --brand-tint: rgba(199,44,44,0.08); --brand-tint-line: rgba(199,44,44,0.2); --on-brand: #FFFFFF;
  --surface: #FFFFFF; --surface-alt: #F7F7F7; --surface-inverse: #1A1A1A;
  --on-inverse: #FFFFFF; --on-inverse-muted: rgba(255,255,255,0.55); --on-inverse-line: rgba(255,255,255,0.1); --on-inverse-accent: #FFAAA4;
  --ink: #1A1A1A; --ink-muted: #6B6B6B; --line: #E2E2E2; --line-strong: #1A1A1A;
  --focus: #C72C2C; --nav-glass: rgba(255,255,255,0.94);
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --radius-sm: 8px; --radius: 14px; --radius-pill: 50px; --radius-full: 50%;
  --shadow: 0 4px 24px rgba(0,0,0,0.07); --shadow-nav: 0 2px 20px rgba(0,0,0,0.08); --shadow-brand: 0 6px 20px rgba(199,44,44,0.3); --shadow-chip: 0 2px 8px rgba(0,0,0,0.04);
  --container: 1080px; --nav-height: 64px; --measure: 520px;
}

html, body.bbsw-body { margin: 0; padding: 0; background: var(--surface); }
.bbsw { font-family: var(--font-sans); font-optical-sizing: auto; color: var(--ink); background: var(--surface); font-size: 16px; line-height: 1.65; -webkit-font-smoothing: antialiased; min-height: 100vh; }
.bbsw *, .bbsw *::before, .bbsw *::after { box-sizing: border-box; }
.bbsw :where(a, button, input, select, textarea, [tabindex]):focus-visible { outline: 2px solid var(--focus); outline-offset: 4px; }
.bbsw :where(a) { color: inherit; }
.bbsw input[type="checkbox"] { accent-color: var(--ink); width: 16px; height: 16px; }
.bbsw img { max-width: 100%; }
.bbsw h1, .bbsw h2, .bbsw h3, .bbsw h4, .bbsw p { margin: 0; }
.bbsw button { font-family: inherit; }
.bbsw-ico { flex-shrink: 0; }

.bbsw-boot { min-height: 60vh; display: flex; align-items: center; justify-content: center; }
.bbsw-mark { font-weight: 800; font-size: 40px; letter-spacing: -0.05em; color: var(--ink); }
.bbsw-mark span { color: var(--brand); }
.bbsw-boot .bbsw-mark { animation: bbsw-pulse 1.2s ease-in-out infinite; }
@keyframes bbsw-pulse { 50% { opacity: .35; } }

/* Layout */
.bbsw-container { max-width: var(--container); margin: 0 auto; padding: 0 28px; }
.bbsw-section { padding: 56px 0; }
.bbsw-section-alt { background: var(--surface-alt); }
.bbsw-stack { display: flex; flex-direction: column; gap: 16px; }
.bbsw-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.bbsw-spacer { flex: 1; }
.bbsw-grid { display: grid; gap: 24px; }
.bbsw-grid-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.bbsw-grid-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.bbsw-grid-4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
@media (max-width: 900px) { .bbsw-grid-3, .bbsw-grid-4 { grid-template-columns: repeat(2, minmax(0,1fr)); } }
@media (max-width: 640px) { .bbsw-grid-2, .bbsw-grid-3, .bbsw-grid-4 { grid-template-columns: 1fr; } .bbsw-container { padding: 0 16px; } .bbsw-section { padding: 36px 0; } }

/* Nav */
.bbsw-nav { position: sticky; top: 0; z-index: 40; height: var(--nav-height); background: var(--nav-glass); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.admin-bar .bbsw-nav { top: 32px; }
.bbsw-nav .bbsw-container { height: 100%; display: flex; align-items: center; gap: 24px; }
.bbsw-brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); }
.bbsw-brand .bbsw-mark { font-size: 28px; line-height: 1; }
.bbsw-brand img { height: 34px; display: block; }
.bbsw-brand-name { font-weight: 700; font-size: 15px; letter-spacing: -0.01em; }
.bbsw-brand-name small { display: block; font-size: 11px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-muted); }
.bbsw-nav-links { display: flex; gap: 6px; align-items: center; margin-left: auto; }
.bbsw-nav-link { display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px; border-radius: var(--radius-pill); font-size: 14px; font-weight: 500; color: var(--ink-muted); text-decoration: none; background: none; border: 0; cursor: pointer; transition: color .22s ease, background .22s ease; }
.bbsw-nav-link:hover { color: var(--brand-text); }
.bbsw-nav-link[aria-current="page"] { color: var(--ink); background: var(--surface-alt); font-weight: 600; }
.bbsw-nav-link .bbsw-ico { width: 18px; height: 18px; }
@media (max-width: 760px) {
  .bbsw-nav-link span { display: none; }
  .bbsw-nav-link { padding: 10px; }
  .bbsw-brand-name { display: none; }
}

/* Type */
.bbsw-eyebrow { font-size: 13px; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--brand-text); margin: 0 0 10px; }
.bbsw-h1 { font-size: clamp(26px, 3vw, 36px); font-weight: 700; line-height: 1.25; color: var(--ink); }
.bbsw-display { font-size: clamp(42px, 6vw, 72px); font-weight: 800; line-height: 1.08; letter-spacing: -0.03em; }
.bbsw-display-lg { font-size: clamp(28px, 3.5vw, 44px); font-weight: 800; line-height: 1.2; letter-spacing: -0.02em; }
.bbsw-dot { color: var(--brand); }
.bbsw-subtitle { font-size: 26px; font-weight: 300; line-height: 1.3; letter-spacing: -0.01em; color: var(--ink-muted); }
.bbsw-lead { font-size: 16px; line-height: 1.75; color: var(--ink-muted); max-width: var(--measure); }
.bbsw-h3 { font-size: 18px; font-weight: 700; line-height: 1.35; }
.bbsw-h4 { font-size: 15px; font-weight: 700; line-height: 1.4; }
.bbsw-label { font-size: 11px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--brand-text); }
.bbsw-muted { color: var(--ink-muted); }
.bbsw-caption { font-size: 13px; line-height: 1.55; color: var(--ink-muted); }
.bbsw-meta { font-size: 12px; font-weight: 600; color: var(--ink-muted); }
.bbsw-mono { font-family: var(--font-mono); font-weight: 500; font-size: 13px; }
.bbsw-head { margin-bottom: 40px; }
.bbsw-head .bbsw-lead { margin-top: 12px; }

/* Buttons */
.bbsw-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 13px 28px; border-radius: var(--radius-pill); font: 600 14px/1.2 var(--font-sans); cursor: pointer; border: 1.5px solid transparent; text-decoration: none; transition: background .22s ease, border-color .22s ease, transform .22s ease, box-shadow .22s ease, color .22s ease; white-space: nowrap; }
.bbsw-btn .bbsw-ico { width: 16px; height: 16px; }
.bbsw-btn-primary { background: var(--brand); color: var(--on-brand); }
.bbsw-btn-primary:hover { background: var(--brand-hover); transform: translateY(-1px); box-shadow: var(--shadow-brand); }
.bbsw-btn-outline { background: transparent; color: var(--ink); border-color: var(--line); }
.bbsw-btn-outline:hover { border-color: var(--line-strong); transform: translateY(-1px); }
.bbsw-btn-dark { background: var(--ink); color: var(--surface); }
.bbsw-btn-dark:hover { background: var(--brand); color: var(--on-brand); }
.bbsw-btn-sm { padding: 8px 18px; font-size: 13px; }
.bbsw-btn-block { width: 100%; }
.bbsw-btn[disabled] { opacity: .45; cursor: not-allowed; transform: none; box-shadow: none; }
.bbsw .bbsw-link, .bbsw-link { background: none; border: 0; padding: 0; color: var(--brand-text); font: 600 14px var(--font-sans); cursor: pointer; text-decoration: none; display: inline-flex; gap: 6px; align-items: center; }
.bbsw .bbsw-link:hover { text-decoration: underline; }
.bbsw-back { display: inline-flex; align-items: center; gap: 8px; color: var(--ink-muted); font-size: 14px; font-weight: 500; text-decoration: none; margin-bottom: 24px; background: none; border: 0; cursor: pointer; padding: 0; }
.bbsw-back:hover { color: var(--brand-text); }

/* Badges, tags, pills */
.bbsw-badge { display: inline-flex; align-items: center; gap: 8px; background: var(--brand-tint); border: 1px solid var(--brand-tint-line); color: var(--brand-text); font-size: 11px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; padding: 4px 12px; border-radius: var(--radius-pill); white-space: nowrap; }
.bbsw-badge::before { content: ""; width: 6px; height: 6px; background: var(--brand); border-radius: 50%; }
.bbsw-tag { display: inline-flex; align-items: center; gap: 6px; background: var(--surface-alt); color: var(--ink); font-size: 12px; font-weight: 600; padding: 4px 12px; border-radius: var(--radius-pill); border: 1px solid var(--line); white-space: nowrap; }
.bbsw-tag-ink { background: var(--ink); color: var(--surface); border-color: var(--ink); }
.bbsw-pills { display: flex; flex-wrap: wrap; gap: 10px; }
.bbsw-pill { padding: 9px 20px; font: 600 13px/1.2 var(--font-sans); border-radius: var(--radius-pill); border: 1.5px solid var(--line); background: var(--surface); color: var(--ink-muted); cursor: pointer; transition: all .22s ease; }
.bbsw-pill:hover { border-color: var(--line-strong); color: var(--ink); }
.bbsw-pill[aria-pressed="true"], .bbsw-pill[aria-selected="true"] { background: var(--brand); border-color: var(--brand); color: var(--on-brand); }
.bbsw-tabs { display: flex; border-bottom: 2px solid var(--line); overflow-x: auto; scrollbar-width: none; margin-bottom: 32px; }
.bbsw-tab { padding: 12px 22px; font: 600 13px/1.2 var(--font-sans); color: var(--ink-muted); background: none; border: 0; border-bottom: 2px solid transparent; margin-bottom: -2px; cursor: pointer; white-space: nowrap; }
.bbsw-tab:hover { color: var(--ink); }
.bbsw-tab[aria-selected="true"] { color: var(--brand-text); border-bottom-color: var(--brand); }

/* Cards */
.bbsw-card { background: var(--surface-alt); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; transition: box-shadow .22s ease, transform .22s ease; }
.bbsw-card-white { background: var(--surface); }
.bbsw-card-raised { background: var(--surface); box-shadow: var(--shadow); padding: 32px 36px; }
@media (max-width: 640px) { .bbsw-card-raised { padding: 24px 20px; } }
a.bbsw-card, button.bbsw-card { display: block; text-decoration: none; color: inherit; text-align: left; font: inherit; cursor: pointer; width: 100%; }
a.bbsw-card:hover, button.bbsw-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); background: var(--surface); }
.bbsw-icon-well { width: 36px; height: 36px; background: var(--brand-tint); color: var(--brand); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; margin-bottom: 14px; }
.bbsw-icon-well .bbsw-ico { width: 18px; height: 18px; }
.bbsw-module-card { display: flex; flex-direction: column; min-height: 200px; }
.bbsw-module-card .bbsw-h3 { margin-bottom: 6px; }
.bbsw-module-card .bbsw-caption { flex: 1; }
.bbsw-module-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 18px; }
.bbsw-progress { height: 6px; background: var(--line); border-radius: 6px; overflow: hidden; flex: 1; }
.bbsw-progress > span { display: block; height: 100%; background: var(--ink); border-radius: 6px; }

/* Stat band */
.bbsw-stats { background: var(--surface-inverse); color: var(--on-inverse); border-radius: var(--radius); display: grid; grid-template-columns: repeat(4, 1fr); padding: 28px 12px; }
.bbsw-stat { text-align: center; padding: 10px 16px; position: relative; }
.bbsw-stat + .bbsw-stat::before { content: ""; position: absolute; left: 0; top: 20%; bottom: 20%; width: 1px; background: var(--on-inverse-line); }
.bbsw-stat-num { font-size: clamp(30px, 3.5vw, 42px); font-weight: 800; line-height: 1; letter-spacing: -0.03em; color: var(--on-inverse); }
.bbsw-stat-num span { color: var(--brand); }
.bbsw-stat-label { font-size: 13px; font-weight: 500; color: var(--on-inverse-muted); margin-top: 6px; }
@media (max-width: 760px) { .bbsw-stats { grid-template-columns: repeat(2, 1fr); } .bbsw-stat:nth-child(3)::before { display: none; } }

/* Forms */
.bbsw-field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.bbsw-field label, .bbsw-field-label { font-size: 13px; font-weight: 600; color: var(--ink); }
.bbsw-input, .bbsw select.bbsw-input, .bbsw textarea.bbsw-input { width: 100%; font: 400 15px/1.4 var(--font-sans); color: var(--ink); background: var(--surface); border: 1.5px solid var(--line); border-radius: var(--radius-sm); padding: 11px 14px; transition: border-color .22s ease; -webkit-appearance: none; appearance: none; }
.bbsw select.bbsw-input { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%231A1A1A' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px; }
.bbsw-input:hover { border-color: #BDBDBD; }
.bbsw-input:focus { border-color: var(--ink); outline: none; }
.bbsw-hint { font-size: 12px; color: var(--ink-muted); }
.bbsw-error { background: var(--brand-tint); border: 1px solid var(--brand-tint-line); color: var(--brand-text); border-radius: var(--radius-sm); padding: 10px 14px; font-size: 14px; font-weight: 500; margin-bottom: 16px; }
.bbsw-ok { background: var(--surface-alt); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 10px 14px; font-size: 14px; font-weight: 500; margin-bottom: 16px; display: flex; gap: 8px; align-items: center; }
.bbsw-check { display: flex; gap: 8px; align-items: center; font-size: 14px; color: var(--ink-muted); }

/* Auth */
.bbsw-auth { display: grid; grid-template-columns: 1.1fr 1fr; gap: 64px; align-items: center; min-height: calc(100vh - var(--nav-height) - 120px); padding: 56px 0; }
.bbsw-auth-copy .bbsw-display { margin-bottom: 18px; }
.bbsw-auth-points { list-style: none; margin: 28px 0 0; padding: 0; }
.bbsw-auth-points li { padding: 6px 0 6px 20px; font-size: 14px; position: relative; }
.bbsw-auth-points li::before { content: ""; position: absolute; left: 0; top: 14px; width: 6px; height: 6px; background: var(--brand); border-radius: 50%; }
@media (max-width: 900px) { .bbsw-auth { grid-template-columns: 1fr; gap: 32px; min-height: 0; } }

/* Lists */
.bbsw-list { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.bbsw-list-row { display: flex; align-items: center; gap: 16px; padding: 14px 20px; border-top: 1px solid var(--line); }
.bbsw-list-row:first-child { border-top: 0; }
.bbsw-list-row:hover { background: var(--surface-alt); }
.bbsw-list-main { flex: 1; min-width: 0; }
.bbsw-list-title { font-size: 15px; font-weight: 600; color: var(--ink); }
.bbsw-list-sub { font-size: 12px; color: var(--ink-muted); margin-top: 2px; }
.bbsw-num-badge { width: 32px; height: 32px; border-radius: 50%; border: 1.5px solid var(--line); display: flex; align-items: center; justify-content: center; font: 500 12px var(--font-mono); color: var(--ink-muted); flex-shrink: 0; }
.bbsw-score { font: 800 15px/1 var(--font-sans); letter-spacing: -0.02em; min-width: 52px; text-align: right; }
.bbsw-score small { font-weight: 600; color: var(--ink-muted); font-size: 11px; letter-spacing: 0; }
.bbsw-section-title { display: flex; align-items: baseline; gap: 12px; margin: 36px 0 14px; }
.bbsw-section-title:first-child { margin-top: 0; }
@media (max-width: 640px) { .bbsw-list-row { padding: 12px 14px; gap: 10px; flex-wrap: wrap; } .bbsw-list-row .bbsw-btn { margin-left: auto; } }

/* Tables */
.bbsw-table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.bbsw-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.bbsw-table th { text-align: left; font-size: 11px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-muted); padding: 12px 16px; border-bottom: 1px solid var(--line); background: var(--surface-alt); white-space: nowrap; }
.bbsw-table td { padding: 12px 16px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.bbsw-table tr:last-child td { border-bottom: 0; }
.bbsw-table .num { text-align: right; font-variant-numeric: tabular-nums; }

/* Worksheet player */
.bbsw-player-bar { position: sticky; top: var(--nav-height); z-index: 30; background: var(--nav-glass); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.admin-bar .bbsw-player-bar { top: calc(var(--nav-height) + 32px); }
.bbsw-player-bar .bbsw-container { display: flex; align-items: center; gap: 16px; min-height: 60px; padding-top: 8px; padding-bottom: 8px; }
.bbsw-player-title { font-weight: 700; font-size: 15px; line-height: 1.3; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bbsw-player-meta { display: flex; gap: 10px; align-items: center; margin-left: auto; }
.bbsw-timer { font: 500 13px var(--font-mono); display: inline-flex; gap: 6px; align-items: center; color: var(--ink); padding: 6px 12px; border-radius: var(--radius-pill); background: var(--surface-alt); border: 1px solid var(--line); }
.bbsw-timer.is-over { color: var(--brand-text); border-color: var(--brand-tint-line); background: var(--brand-tint); }
.bbsw-timer .bbsw-ico { width: 14px; height: 14px; }
.bbsw-answered { font-size: 12px; font-weight: 600; color: var(--ink-muted); white-space: nowrap; }
@media (max-width: 640px) { .bbsw-answered { display: none; } .bbsw-player-title { font-size: 14px; } }

.bbsw-q { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; }
.bbsw-q-intro { background: var(--surface-alt); }
.bbsw-q-head { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.bbsw-q-num { min-width: 28px; height: 28px; padding: 0 8px; border-radius: var(--radius-pill); background: var(--ink); color: var(--surface); display: inline-flex; align-items: center; justify-content: center; font: 700 13px var(--font-sans); }
.bbsw-q-img { position: relative; border-radius: var(--radius-sm); overflow: hidden; background: #fff; border: 1px solid var(--line); line-height: 0; }
.bbsw-q-img img { width: 100%; height: auto; display: block; }
.bbsw-q-img canvas { position: absolute; inset: 0; width: 100%; height: 100%; touch-action: none; }
.bbsw-q-img.is-drawing canvas { cursor: crosshair; }
.bbsw-q-img:not(.is-drawing) canvas { pointer-events: none; }
.bbsw-draw-tools { display: flex; gap: 8px; align-items: center; margin-top: 10px; flex-wrap: wrap; }
.bbsw-swatch { width: 26px; height: 26px; border-radius: 50%; border: 2px solid var(--surface); box-shadow: 0 0 0 1.5px var(--line); cursor: pointer; padding: 0; }
.bbsw-swatch[aria-pressed="true"] { box-shadow: 0 0 0 2px var(--ink); }
.bbsw-fields { margin-top: 16px; display: flex; flex-direction: column; gap: 10px; }
.bbsw-f { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 8px; font-size: 15px; line-height: 1.5; padding: 8px 12px; border-radius: var(--radius-sm); background: var(--surface-alt); }
.bbsw-f-label { font-weight: 700; color: var(--ink); margin-right: 4px; }
.bbsw-f-note { font-style: italic; color: var(--ink-muted); background: none; padding: 0 2px; }
.bbsw-f-text { white-space: pre-wrap; }
.bbsw-blank { font: 600 15px/1.3 var(--font-sans); color: var(--ink); background: var(--surface); border: 1.5px solid #CFCFCF; border-radius: var(--radius-sm); padding: 7px 10px; min-width: 56px; max-width: 100%; transition: border-color .2s ease, box-shadow .2s ease; }
.bbsw-blank:focus { outline: none; border-color: var(--ink); box-shadow: 0 0 0 3px rgba(26,26,26,0.08); }
textarea.bbsw-blank { width: 100%; min-height: 64px; resize: vertical; font-weight: 500; }
select.bbsw-blank { -webkit-appearance: none; appearance: none; padding-right: 30px; background: var(--surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%231A1A1A' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat right 10px center; cursor: pointer; }
.bbsw-choices { display: inline-flex; flex-wrap: wrap; gap: 6px; }
.bbsw-choice { padding: 6px 14px; font: 600 14px/1.2 var(--font-sans); border-radius: var(--radius-pill); border: 1.5px solid #CFCFCF; background: var(--surface); color: var(--ink); cursor: pointer; transition: all .18s ease; }
.bbsw-choice:hover { border-color: var(--ink); }
.bbsw-choice[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--surface); }
.bbsw-pick { display: flex; flex-wrap: wrap; gap: 4px; line-height: 1.4; }
.bbsw-token { padding: 4px 6px; border-radius: 6px; border: 1.5px dashed transparent; background: none; font: 500 15px var(--font-sans); color: var(--ink); cursor: pointer; }
.bbsw-token:hover { border-color: var(--line); }
.bbsw-token[aria-pressed="true"] { background: var(--ink); color: var(--surface); text-decoration: underline; text-underline-offset: 3px; }
.bbsw-gridq { display: inline-grid; gap: 4px; }
.bbsw-gridq button { width: 40px; height: 40px; border-radius: 8px; border: 1.5px solid #CFCFCF; background: var(--surface); font: 700 16px var(--font-sans); cursor: pointer; color: var(--ink); }
.bbsw-gridq button.is-given { background: var(--surface-alt); border-color: var(--line); cursor: default; }
.bbsw-gridq button.c-R { background: #C72C2C; color: #fff; border-color: #C72C2C; }
.bbsw-gridq button.c-B { background: #1A1A1A; color: #fff; border-color: #1A1A1A; }
.bbsw-gridq button.c-Y { background: #EDEDED; color: #1A1A1A; border-color: #BDBDBD; }
@media (max-width: 480px) { .bbsw-gridq button { width: 34px; height: 34px; font-size: 14px; } }
.bbsw-overlay { position: absolute; transform: translate(-50%, -50%); z-index: 2; line-height: 1.2; }
.bbsw-overlay .bbsw-blank { box-shadow: var(--shadow); min-width: 0; width: clamp(92px, 22vw, 150px); font-size: 14px; }
.bbsw-overlay .bbsw-mark-row { position: absolute; top: 100%; left: 0; white-space: nowrap; }
.bbsw-speak { width: 40px; height: 40px; border-radius: 50%; background: var(--brand-tint); color: var(--brand); border: 0; display: inline-flex; align-items: center; justify-content: center; cursor: pointer; flex-shrink: 0; }
.bbsw-speak:hover { background: var(--brand); color: var(--on-brand); }

/* Drill layout */
.bbsw-drill { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
@media (max-width: 900px) { .bbsw-drill { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 640px) { .bbsw-drill { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.bbsw-drill .bbsw-f { background: var(--surface); border: 1px solid var(--line); padding: 10px 12px; flex-wrap: nowrap; font: 600 16px var(--font-sans); font-variant-numeric: tabular-nums; }
.bbsw-drill .bbsw-f-label { font: 500 11px var(--font-mono); color: var(--ink-muted); min-width: 22px; }
.bbsw-drill .bbsw-blank { width: 64px; min-width: 0; text-align: center; padding: 6px; }
.bbsw-drill-mm { grid-template-columns: 1fr; }
.bbsw-drill-mm .bbsw-f { flex-wrap: wrap; font-weight: 500; }
.bbsw-drill-mm .bbsw-blank { width: 110px; }
.bbsw-spell .bbsw-f { gap: 12px; }
.bbsw-spell .bbsw-blank { width: 260px; max-width: 100%; }

/* Marks */
.bbsw-mark-ok, .bbsw-mark-no, .bbsw-mark-open { display: inline-flex; align-items: center; gap: 4px; font-size: 12px; font-weight: 700; border-radius: var(--radius-pill); padding: 2px 8px 2px 4px; }
.bbsw-mark-ok { color: var(--ink); background: #EDEDED; }
.bbsw-mark-no { color: var(--brand-text); background: var(--brand-tint); }
.bbsw-mark-open { color: var(--ink-muted); background: var(--surface-alt); border: 1px dashed var(--line); }
.bbsw-mark-ok .bbsw-ico, .bbsw-mark-no .bbsw-ico { width: 14px; height: 14px; }
.bbsw-blank.is-ok { border-color: var(--ink); background: #F2F2F2; }
.bbsw-blank.is-no { border-color: var(--brand); background: var(--brand-tint); }
.bbsw-choice.is-ok { box-shadow: 0 0 0 2px var(--ink); }
.bbsw-choice.is-no { box-shadow: 0 0 0 2px var(--brand); }
.bbsw-expected { font-size: 13px; color: var(--ink-muted); }
.bbsw-expected b { color: var(--ink); font-weight: 600; }
.bbsw-result { background: var(--surface-inverse); color: var(--on-inverse); border-radius: var(--radius); padding: 32px; display: grid; grid-template-columns: auto 1fr auto; gap: 32px; align-items: center; margin-bottom: 28px; }
.bbsw-result .bbsw-eyebrow { color: var(--on-inverse-accent); }
.bbsw-result-big { font-size: clamp(52px, 8vw, 88px); font-weight: 800; letter-spacing: -0.04em; line-height: 1; }
.bbsw-result-big span { color: var(--brand); }
.bbsw-result p { color: var(--on-inverse-muted); }
.bbsw-result .bbsw-btn-outline { color: var(--on-inverse); border-color: var(--on-inverse-line); }
.bbsw-result .bbsw-btn-outline:hover { border-color: var(--on-inverse); }
@media (max-width: 760px) { .bbsw-result { grid-template-columns: 1fr; gap: 16px; } }
.bbsw-drawing { margin-top: 10px; }
.bbsw-drawing img { border: 1px dashed var(--line); border-radius: var(--radius-sm); }

/* Leaderboard */
.bbsw-chart { width: 100%; }
.bbsw-chart svg { display: block; width: 100%; height: auto; overflow: visible; }
.bbsw-chart text { font-family: var(--font-sans); }
.bbsw-board-row { display: grid; grid-template-columns: 44px 1fr auto; align-items: center; gap: 12px; padding: 14px 20px; border-top: 1px solid var(--line); }
.bbsw-board-row:first-child { border-top: 0; }
.bbsw-rank { font: 800 18px var(--font-sans); letter-spacing: -0.02em; color: var(--ink-muted); }
.bbsw-board-row:nth-child(-n+3) .bbsw-rank { color: var(--brand); }
.bbsw-board-name { font-weight: 600; }
.bbsw-board-pts { font: 800 18px var(--font-sans); letter-spacing: -0.02em; }
.bbsw-board-pts small { font-size: 11px; font-weight: 600; color: var(--ink-muted); letter-spacing: 0; margin-left: 4px; }

.bbsw-empty { text-align: center; padding: 48px 20px; color: var(--ink-muted); border: 1px dashed var(--line); border-radius: var(--radius); }
.bbsw-empty .bbsw-h3 { color: var(--ink); margin-bottom: 6px; }
.bbsw-code { font: 500 20px var(--font-mono); letter-spacing: 0.18em; background: var(--surface); border: 1px dashed var(--line-strong); border-radius: var(--radius-sm); padding: 8px 14px; display: inline-block; }
.bbsw-footer { border-top: 1px solid var(--line); padding: 28px 0 40px; margin-top: 40px; }
.bbsw-footer .bbsw-container { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; font-size: 12px; color: var(--ink-muted); }
.bbsw-footer a { color: var(--ink-muted); text-decoration: none; }
.bbsw-footer a:hover { color: var(--brand-text); }
.bbsw-toast { font-family: "Inter", system-ui, sans-serif; position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: var(--ink); color: var(--surface); padding: 12px 20px; border-radius: var(--radius-pill); font-size: 14px; font-weight: 600; z-index: 100; box-shadow: var(--shadow); }
.bbsw-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.bbsw-source { font-size: 12px; color: var(--ink-muted); margin-top: 8px; }

@media (prefers-reduced-motion: reduce) { .bbsw *, .bbsw *::before { animation: none !important; transition: none !important; } }
.bbsw-section-alt .bbsw-card { background: var(--surface); }
.bbsw-overlay { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.bbsw-overlay .bbsw-expected { background: var(--surface); padding: 0 6px; border-radius: 6px; font-size: 12px; }
.bbsw-overlay .bbsw-mark-ok, .bbsw-overlay .bbsw-mark-no { font-size: 11px; }
.bbsw-chart svg { max-width: 100%; }