/* ==========================================================
   Core Revision Guide: extra styles on top of ../css/style.css
   Each part of the guide has its own colour, set by the class on
   <body> (e.g. class="rev ca1"). Change --ca to re-colour a page.
   ========================================================== */

.rev        { --ca: #14213d; --ca-2: #3e5585; --ca-light: #e6eaf3; }
.rev.ca1    { --ca: #1f4e79; --ca-2: #4a7fb0; --ca-light: #dfeaf5; }
.rev.ca2    { --ca: #8b3a00; --ca-2: #c0632a; --ca-light: #fbe6d9; }
.rev.ca3    { --ca: #00664f; --ca-2: #2f9a7f; --ca-light: #daf0e9; }
.rev.ca4    { --ca: #5b2a86; --ca-2: #8a5bb5; --ca-light: #ece2f5; }
.rev.ca5    { --ca: #7a5c00; --ca-2: #a8862a; --ca-light: #f6eed5; }
.rev.ca6    { --ca: #005f73; --ca-2: #2f8ea3; --ca-light: #d8edf2; }
.rev.ca7    { --ca: #8b1e3f; --ca-2: #b8506f; --ca-light: #f7dfe6; }
.rev.ca8    { --ca: #333333; --ca-2: #666666; --ca-light: #e8e8e8; }

[hidden] {
    display: none !important;
}

.rev-site {
    max-width: 1240px;
}

.rev h3 {
    color: var(--ca);
    border-bottom: 2px dashed var(--ca-2);
    margin-top: 1.2rem;
}

.rev h3:first-child {
    margin-top: 0;
}

.rev h4 {
    margin: 1rem 0 0.4rem;
    color: var(--ca);
}

.rev a {
    color: var(--ca);
}

.rev a:hover,
.rev a:focus-visible {
    background: var(--ca);
    color: var(--white);
}

/* ----------------------------------------------------------
   Header banner (like the coloured section openers)
   ---------------------------------------------------------- */
.rev-header {
    position: relative;
    overflow: hidden;
    margin-bottom: 14px;
    padding: 18px 22px;
    color: var(--white);
    background: var(--ca);
    border: 2px solid;
    border-color: var(--white) var(--grey-dark) var(--grey-dark) var(--white);
    box-shadow: 4px 4px 0 var(--ink);
}

.rev-header .kicker {
    margin: 0;
    font-family: "Press Start 2P", "Courier New", monospace;
    font-size: 0.6rem;
    letter-spacing: 1px;
    line-height: 1.8;
    color: var(--yellow);
}

.rev-header h1 {
    position: relative;
    margin: 8px 0 10px;
    color: var(--white);
    font-family: "Press Start 2P", "Courier New", monospace;
    font-size: clamp(1.05rem, 3.6vw, 1.9rem);
    line-height: 1.45;
    text-shadow: 3px 3px 0 rgba(0, 0, 0, 0.35);
}

.rev-header p {
    position: relative;
    max-width: 75ch;
}

.rev-header .links {
    font-size: 0.85rem;
    opacity: 0.95;
}

.rev-header a {
    color: var(--yellow);
}

.rev-header .big-num {
    position: absolute;
    right: 14px;
    bottom: -42px;
    font-family: "Arial Black", Impact, sans-serif;
    font-size: 10rem;
    line-height: 1;
    opacity: 0.16;
    pointer-events: none;
}

/* Nav buttons get a coloured tab underneath, like the printed page tabs */
.rev-nav a[class^="tab-"] {
    border-bottom-width: 5px;
}

.rev-nav .tab-index, .rev-nav .tab-exams, .rev-nav .tab-mock1,
.rev-nav .tab-mock2, .rev-nav .tab-glossary { border-bottom-color: #14213d; }
.rev-nav .tab-ca1 { border-bottom-color: #1f4e79; }
.rev-nav .tab-ca2 { border-bottom-color: #8b3a00; }
.rev-nav .tab-ca3 { border-bottom-color: #00664f; }
.rev-nav .tab-ca4 { border-bottom-color: #5b2a86; }
.rev-nav .tab-ca5 { border-bottom-color: #7a5c00; }
.rev-nav .tab-ca6 { border-bottom-color: #005f73; }
.rev-nav .tab-ca7 { border-bottom-color: #8b1e3f; }
.rev-nav .tab-ca8 { border-bottom-color: #333333; }

/* ----------------------------------------------------------
   Layout: contents sidebar + main column
   ---------------------------------------------------------- */
.rev-layout {
    display: grid;
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
}

.rev-toc {
    position: sticky;
    top: 10px;
    max-height: calc(100vh - 20px);
    overflow-y: auto;
    padding: 6px;
    font-size: 0.85rem;
    background: var(--grey);
    border: 2px solid;
    border-color: var(--white) var(--grey-dark) var(--grey-dark) var(--white);
    box-shadow: 4px 4px 0 var(--ca);
}

.rev-toc summary {
    padding: 2px 8px;
    cursor: pointer;
    color: var(--white);
    background: linear-gradient(90deg, var(--ca), var(--ca-2));
    font-family: "VT323", "Courier New", monospace;
    font-size: 1.35rem;
}

.rev-toc ol {
    list-style: none;
    margin: 6px 0 0;
    padding: 4px;
    background: var(--white);
    border: 2px solid;
    border-color: var(--grey-dark) var(--white) var(--white) var(--grey-dark);
}

.rev-toc li {
    margin: 0;
}

.rev-toc ol a {
    display: block;
    padding: 3px 6px;
    color: var(--ink);
    font-weight: normal;
    text-decoration: none;
}

.rev-toc ol a.active {
    color: var(--white);
    background: var(--ca);
}

.toc-option {
    display: flex;
    gap: 6px;
    align-items: flex-start;
    margin: 8px 2px;
    font-weight: bold;
    cursor: pointer;
}

.toc-option input {
    accent-color: var(--ca);
    margin-top: 3px;
}

.reminder-box {
    margin-top: 8px;
    padding: 8px;
    background: #fff8d6;
    border: 2px dashed var(--ca);
}

.reminder-box strong {
    font-family: "Press Start 2P", monospace;
    font-size: 0.55rem;
    color: var(--ca);
}

.reminder-box p {
    margin: 6px 0;
}

.reminder-box .button {
    font-size: 0.75rem;
    padding: 3px 8px;
}

@media (max-width: 900px) {
    .rev-layout {
        grid-template-columns: minmax(0, 1fr);
    }

    .rev-toc {
        position: static;
        max-height: none;
    }
}

/* ----------------------------------------------------------
   Windows: the h2 is the title bar
   ---------------------------------------------------------- */
.rev .window {
    box-shadow: 4px 4px 0 var(--ca);
    scroll-margin-top: 12px;
}

.rev .window > h2 {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    margin: 0;
    padding: 3px 76px 3px 8px;
    color: var(--white);
    background: linear-gradient(90deg, var(--ca), var(--ca-2));
    font-family: "VT323", "Courier New", monospace;
    font-size: 1.5rem;
    font-weight: normal;
    letter-spacing: 1px;
    overflow-wrap: anywhere;
}

/* The _ □ × buttons (added by js/windows.js) sit over the right of the h2,
   so the heading text itself stays clean for the page contents list.
   The right padding on the h2 above leaves room for them. */
.rev .window:not(.win-maximised) {
    position: relative;
}

.rev .window.win-maximised {
    box-shadow: 0 0 0 100vmax rgba(20, 20, 40, 0.6);
}

.rev .title-bar-controls-float {
    position: absolute;
    top: 6px;
    right: 4px;
    margin: 0;
}

.rev .window-body {
    overflow-wrap: break-word;
}

/* ----------------------------------------------------------
   Tables
   ---------------------------------------------------------- */
.table-wrap {
    overflow-x: auto;
    margin: 8px 0 14px;
}

.rev main table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    background: var(--white);
}

.rev main th,
.rev main td {
    padding: 6px 8px;
    text-align: left;
    vertical-align: top;
    border: 1px solid var(--grey-dark);
}

.rev main th {
    color: var(--white);
    background: var(--ca);
}

.rev main tr:nth-child(even) td {
    background: var(--ca-light);
}

.rev main td ul {
    margin: 0;
    padding-left: 16px;
}

/* Spec checklist */
table.spec td:nth-child(n+3),
table.spec th:nth-child(n+3) {
    width: 4.6em;
    text-align: center;
    vertical-align: middle;
}

table.spec td:first-child {
    white-space: nowrap;
    font-weight: bold;
}

table.spec input {
    width: 18px;
    height: 18px;
    accent-color: var(--ca);
    cursor: pointer;
}

table.spec tr.rated-secure td:first-child { box-shadow: inset 6px 0 #137a2f; }
table.spec tr.rated-unsure td:first-child { box-shadow: inset 6px 0 #d99a00; }
table.spec tr.rated-revise td:first-child { box-shadow: inset 6px 0 #c0001a; }
table.spec.only-weak tr.rated-secure { display: none; }

.spec-summary {
    font-weight: bold;
}

/* ----------------------------------------------------------
   Boxes: exam tip, common mistake, quick check, stretch...
   ---------------------------------------------------------- */
.box {
    margin: 14px 0;
    padding: 10px 14px;
    background: var(--ca-light);
    border: 1px solid var(--ca);
    border-left: 6px solid var(--ca);
}

.box h4 {
    margin: 0 0 6px;
    font-family: "Press Start 2P", "Courier New", monospace;
    font-size: 0.6rem;
    line-height: 1.7;
    letter-spacing: 1px;
    color: var(--ca);
}

.box > :last-child,
.box ul:last-child {
    margin-bottom: 0;
}

.box ul {
    margin-top: 0;
}

.box.mistake { background: #fdecec; border-color: #b3001b; }
.box.mistake h4 { color: #b3001b; }
.box.worked { background: #fffbe6; }
.box.stretch { background: var(--white); border-style: dashed; border-left-style: solid; }
.box.support { background: #f2f2f2; }
.box.scenario { background: #fff8d6; border: 2px dashed var(--ca); }

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 10px;
}

.grid-2 > .box {
    margin: 0;
}

/* ----------------------------------------------------------
   Quick recall (cover-up definitions)
   ---------------------------------------------------------- */
.recall-box {
    margin: 16px 0;
    padding: 10px 14px;
    background: var(--ca-light);
    border: 2px solid var(--ca);
}

.recall-head {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 12px;
    margin-bottom: 8px;
}

.recall-head strong {
    color: var(--ca);
    font-family: "VT323", "Courier New", monospace;
    font-size: 1.45rem;
    font-weight: normal;
}

.recall-head span {
    flex: 1;
    font-size: 0.85rem;
}

.recall-head .button {
    font-size: 0.8rem;
}

dl.recall {
    display: grid;
    grid-template-columns: minmax(130px, 230px) 1fr;
    margin: 0;
    background: var(--white);
    border: 1px solid var(--grey-dark);
}

dl.recall dt,
dl.recall dd {
    margin: 0;
    padding: 5px 8px;
    border-bottom: 1px solid var(--grey-light);
}

dl.recall dt {
    font-weight: bold;
}

dl.recall.covered dd {
    cursor: pointer;
}

dl.recall.covered dd:not(.shown) {
    color: transparent;
    background: repeating-linear-gradient(45deg, var(--grey-light) 0 6px, var(--grey) 6px 12px);
    user-select: none;
}

dl.recall.covered dd:not(.shown) * {
    visibility: hidden;
}

@media (max-width: 600px) {
    dl.recall {
        grid-template-columns: 1fr;
    }

    dl.recall dt {
        border-bottom: none;
        padding-bottom: 0;
    }
}

/* ----------------------------------------------------------
   Flashcards
   ---------------------------------------------------------- */
.flashcard {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 10px;
    width: 100%;
    min-height: 190px;
    margin-bottom: 10px;
    padding: 22px;
    color: var(--ink);
    background: var(--white);
    font-family: Verdana, Tahoma, sans-serif;
    font-size: 1.15rem;
    text-align: center;
    cursor: pointer;
    border: 3px double var(--ca);
    box-shadow: 4px 4px 0 var(--ca);
}

.flashcard.flipped {
    background: var(--ca-light);
}

.flashcard-face {
    font-weight: bold;
}

.flashcard.flipped .flashcard-face {
    font-weight: normal;
}

.flashcard-hint {
    color: #595959;
    font-family: "Press Start 2P", monospace;
    font-size: 0.5rem;
}

.flashcard-count {
    font-family: "VT323", monospace;
    font-size: 1.4rem;
}

/* ----------------------------------------------------------
   Knowledge organiser
   ---------------------------------------------------------- */
.ko {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 8px;
    margin: 10px 0;
}

.ko > div {
    padding: 10px 12px;
    background: var(--ca-light);
    border-top: 5px solid var(--ca);
}

.ko h4 {
    margin: 0 0 6px;
    color: var(--ca);
    font-family: "VT323", "Courier New", monospace;
    font-size: 1.35rem;
    font-weight: normal;
    letter-spacing: 1px;
}

.ko ul {
    margin: 0;
    padding-left: 18px;
    font-size: 0.9rem;
}

.ko li {
    margin-bottom: 3px;
}

.ko.quiz li {
    cursor: pointer;
}

.ko.quiz li:not(.seen) {
    filter: blur(5px);
    user-select: none;
}

/* ----------------------------------------------------------
   Code blocks (line numbers come from a CSS counter)
   ---------------------------------------------------------- */
.code-wrap {
    position: relative;
}

.rev pre.code {
    counter-reset: line;
    padding-left: 0;
    padding-right: 120px;
}

.rev pre.code .ln {
    display: block;
    min-height: 1.4em;
    padding-left: 3.2em;
}

.rev pre.code .ln::before {
    counter-increment: line;
    content: counter(line);
    display: inline-block;
    width: 2.2em;
    margin-left: -3em;
    margin-right: 0.8em;
    text-align: right;
    color: #b07a98;
    user-select: none;
}

.copy-btn {
    position: absolute;
    top: 6px;
    right: 6px;
    padding: 1px 6px;
    font-size: 0.7rem;
    font-weight: bold;
    cursor: pointer;
    background: var(--grey);
    border: 2px solid;
    border-color: var(--white) var(--grey-dark) var(--grey-dark) var(--white);
}

.out-label {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 10px;
    margin: -6px 0 6px;
    font-size: 0.9rem;
}

.out-label .button {
    padding: 2px 10px;
    font-size: 0.8rem;
}

.rev pre.out {
    color: #39ff14;
    background: #111;
    border-style: dotted;
}

/* ----------------------------------------------------------
   Questions and self-marking
   ---------------------------------------------------------- */
.scoreboard {
    position: sticky;
    top: 0;
    z-index: 2;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 12px;
    margin-bottom: 12px;
    padding: 8px 10px;
    color: var(--yellow);
    background: var(--ink);
    font-family: "VT323", "Courier New", monospace;
    font-size: 1.25rem;
    border: 3px ridge var(--ca-2);
}

.score-text {
    flex: 1 1 260px;
}

.scoreboard .button {
    padding: 3px 10px;
    font-size: 0.78rem;
}

.mock .scoreboard {
    position: static;
}

.q {
    padding: 12px 0 16px;
    border-bottom: 2px dashed var(--ca-light);
}

.q:last-child {
    border-bottom: none;
}

.q-num {
    display: inline-block;
    min-width: 2.8em;
    margin-bottom: 4px;
    padding: 1px 6px;
    color: var(--white);
    background: var(--ca);
    font-family: "VT323", "Courier New", monospace;
    font-size: 1.2rem;
    text-align: center;
}

.q > p:first-of-type {
    font-weight: bold;
}

.q-marks {
    color: var(--ca);
    white-space: nowrap;
}

.q-answer {
    display: block;
    width: 100%;
    margin: 8px 0;
    padding: 6px 8px;
    font-family: Verdana, Tahoma, sans-serif;
    font-size: 0.95rem;
    resize: vertical;
    border: 2px solid;
    border-color: var(--grey-dark) var(--white) var(--white) var(--grey-dark);
    background: #fffef5;
}

.q-self {
    font-size: 0.9rem;
    font-weight: bold;
}

.ms {
    margin-top: 10px;
    padding: 10px 14px;
    background: #f0fbf2;
    border: 2px solid #137a2f;
}

.ms::before {
    content: "\2714  MARK SCHEME";
    display: block;
    margin-bottom: 6px;
    color: #137a2f;
    font-family: "Press Start 2P", monospace;
    font-size: 0.55rem;
}

.ms ul {
    margin-top: 0;
}

.ms .ref {
    color: #137a2f;
    font-family: "Courier New", monospace;
    font-size: 0.85rem;
}

.sub-label {
    font-family: "VT323", "Courier New", monospace;
    font-size: 1.3rem;
    color: var(--ca);
}

/* Mock paper timer bar */
.mock-bar {
    position: sticky;
    top: 0;
    z-index: 3;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    padding: 6px 8px;
    background: var(--grey);
    border: 2px solid;
    border-color: var(--white) var(--grey-dark) var(--grey-dark) var(--white);
    box-shadow: 4px 4px 0 var(--ca);
}

.mock-clock {
    min-width: 5.2em;
    color: #39ff14;
    background: #000;
    font-size: 1.7rem;
    text-align: center;
}

.mock-status {
    font-size: 0.85rem;
    font-weight: bold;
}

.paper-total {
    text-align: right;
    font-weight: bold;
}

/* ----------------------------------------------------------
   Diagrams
   ---------------------------------------------------------- */
.fig {
    margin: 14px 0;
    text-align: center;
}

.fig svg {
    max-width: 100%;
    height: auto;
}

.fig figcaption {
    margin-top: 6px;
    font-style: italic;
    font-size: 0.85rem;
}

.fig text {
    font-family: Verdana, Tahoma, sans-serif;
    font-size: 13px;
    fill: var(--ink);
}

.fig .shape {
    fill: var(--white);
    stroke: var(--ca);
    stroke-width: 2;
}

.fig .line {
    fill: none;
    stroke: var(--ink);
    stroke-width: 1.6;
}

.fig .label {
    font-size: 11px;
    font-weight: bold;
}

/* Boxes joined by arrows */
.flow {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin: 12px 0;
}

.flow > div {
    flex: 1 1 110px;
    max-width: 220px;
    padding: 8px;
    text-align: center;
    background: var(--white);
    border: 2px solid var(--ca);
    box-shadow: 3px 3px 0 var(--ca-light);
    font-size: 0.85rem;
}

.flow > div strong {
    display: block;
    color: var(--ca);
}

.flow .arrow {
    color: var(--ca);
    font-weight: bold;
    font-size: 0.8rem;
    text-align: center;
}

/* Tree diagrams (block diagram, hierarchical model) */
.tree {
    margin: 14px 0;
    text-align: center;
}

.tree-root {
    display: inline-block;
    padding: 8px 22px;
    font-weight: bold;
    background: var(--white);
    border: 2px solid var(--ca);
}

.tree-kids {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 10px;
    margin-top: 14px;
    padding-top: 14px;
    border-top: 3px solid var(--ca);
}

.tree-kids > div > strong {
    display: block;
    padding: 6px;
    color: var(--white);
    background: var(--ca);
}

.tree-kids ul {
    list-style: none;
    margin: 0;
    padding: 0;
    border: 2px solid var(--ca);
    border-top: none;
}

.tree-kids li {
    margin: 0;
    padding: 5px;
    font-size: 0.85rem;
    background: var(--white);
    border-top: 1px dashed var(--grey);
}

/* Click-to-reveal worked examples */
details.box > summary {
    cursor: pointer;
}

details.box[open] > summary {
    margin-bottom: 8px;
    padding-bottom: 8px;
    border-bottom: 1px dashed var(--ca);
}

/* Algorithm stepper (CA2) */
.viz-row {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    min-height: 52px;
    margin: 12px 0 6px;
}

.viz-cell {
    min-width: 44px;
    padding: 6px 4px;
    text-align: center;
    font-family: "VT323", "Courier New", monospace;
    font-size: 1.6rem;
    background: var(--white);
    border: 2px solid var(--ca);
    transition: background 0.2s, opacity 0.2s;
}

.viz-cell.part {
    border-width: 2px 2px 6px;
}

.viz-cell.hi {
    background: var(--yellow);
}

.viz-cell.fixed {
    background: #c8efd0;
    border-color: #137a2f;
}

.viz-cell.out {
    opacity: 0.3;
}

.viz-note {
    min-height: 3em;
    font-weight: bold;
}

/* Live output boxes on CA8 (SQL query, hash) */
.rev pre.sqli-out {
    white-space: pre-wrap;
    word-break: break-all;
    color: #39ff14;
    background: #111;
}

/* Exam timing bar */
.time-bar {
    display: flex;
    height: 52px;
    margin: 10px 0 4px;
    font-size: 0.8rem;
    font-weight: bold;
    border: 2px solid var(--ink);
}

.time-bar > div {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2px;
    text-align: center;
    border-right: 2px solid var(--ink);
}

.time-bar > div:last-child {
    border-right: none;
}

.time-legend {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    font-family: "Courier New", monospace;
}

/* ----------------------------------------------------------
   Guide home
   ---------------------------------------------------------- */
.part-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 10px;
}

.part-card {
    display: flex;
    flex-direction: column;
    padding: 12px 14px;
    color: var(--white);
    background: var(--card);
    border: 2px solid;
    border-color: var(--white) #333 #333 var(--white);
}

.part-card > a {
    color: var(--white);
    font-family: "Press Start 2P", monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    text-decoration: none;
}

.part-card > a span {
    display: block;
    margin-top: 4px;
    font-family: Verdana, sans-serif;
    font-size: 0.95rem;
    color: var(--yellow);
}

.part-card ul {
    margin: 8px 0 0;
    padding-left: 16px;
    font-size: 0.82rem;
}

.part-card li {
    margin-bottom: 2px;
}

.part-card ul a {
    color: var(--white);
    font-weight: normal;
}

.part-card ul a:hover,
.part-card > a:hover {
    color: var(--ink);
    background: var(--yellow);
}

.mini-bar {
    display: flex;
    height: 12px;
    margin-bottom: 4px;
    background: var(--grey-light);
    border: 1px solid var(--grey-dark);
}

.mini-secure { background: #137a2f; }
.mini-unsure { background: #d99a00; }
.mini-revise { background: #c0001a; }

.search-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.search-row input,
.glossary-tools input,
.glossary-tools select {
    flex: 1 1 220px;
    padding: 6px 8px;
    font-size: 1rem;
    border: 2px solid;
    border-color: var(--grey-dark) var(--white) var(--white) var(--grey-dark);
}

.search-list {
    list-style: none;
    padding: 0;
}

.search-list li {
    padding: 6px 0;
    border-bottom: 1px dashed var(--grey);
}

.search-snippet {
    display: block;
    font-size: 0.82rem;
    color: #555;
}

/* Glossary */
.glossary-tools {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.rev .glossary dt {
    margin-top: 10px;
    color: var(--ca);
}

.tag {
    display: inline-block;
    margin-left: 6px;
    padding: 0 5px;
    color: var(--white);
    font-family: "Courier New", monospace;
    font-size: 0.75rem;
    font-weight: bold;
    vertical-align: middle;
}

.tag-CA1 { background: #1f4e79; }
.tag-CA2 { background: #8b3a00; }
.tag-CA3 { background: #00664f; }
.tag-CA4 { background: #5b2a86; }
.tag-CA5 { background: #7a5c00; }
.tag-CA6 { background: #005f73; }
.tag-CA7 { background: #8b1e3f; }
.tag-CA8 { background: #333333; }

.tag:hover {
    color: var(--yellow);
}

/* Notes */
textarea.notes {
    width: 100%;
    min-height: 140px;
    padding: 8px;
    font-family: "Courier New", monospace;
    font-size: 0.95rem;
    line-height: 26px;
    resize: vertical;
    background: repeating-linear-gradient(var(--white) 0 25px, #c9c9c9 25px 26px);
    border: 2px solid;
    border-color: var(--grey-dark) var(--white) var(--white) var(--grey-dark);
}

.checklist-table input {
    width: 18px;
    height: 18px;
    accent-color: var(--ca);
}

/* Tick list of "I can..." statements (ESP and specialism pages) */
.checklist {
    list-style: none;
    padding-left: 0;
}

.checklist li {
    margin: 6px 0;
}

.checklist label {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    cursor: pointer;
}

.checklist input {
    flex: none;
    width: 18px;
    height: 18px;
    margin-top: 2px;
    accent-color: var(--ca);
}

.checklist input:checked + span {
    color: #595959;
    text-decoration: line-through;
}

/* Previous / next links */
.pager {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: space-between;
    margin: 4px 0 20px;
}

.pager-next {
    margin-left: auto;
}

/* ----------------------------------------------------------
   Spaced-repetition flashcard buttons
   ---------------------------------------------------------- */
.srs-rate {
    margin-bottom: 8px;
}

.srs-rate .button {
    flex: 1 1 140px;
    padding: 8px 12px;
    font-size: 1rem;
}

.rev .srs-got { background: #c8efd0; }
.rev .srs-not { background: #f8d0d6; }

.srs-stats {
    margin: 8px 0 4px;
    font-size: 0.85rem;
    font-weight: bold;
}

.srs-reset {
    padding: 2px 8px;
    font-size: 0.75rem;
}

/* ----------------------------------------------------------
   Quiz me
   ---------------------------------------------------------- */
.quiz-me .quiz-question {
    margin-top: 8px;
}

.quiz-me .quiz-answer {
    margin-bottom: 10px;
}

/* ----------------------------------------------------------
   Python runner
   ---------------------------------------------------------- */
.run-btn {
    position: absolute;
    top: 6px;
    right: 62px;
    padding: 1px 6px;
    color: #111;
    background: #9af0a8;
    font-size: 0.7rem;
    font-weight: bold;
    cursor: pointer;
    border: 2px solid;
    border-color: var(--white) var(--grey-dark) var(--grey-dark) var(--white);
}

.runner {
    margin: -6px 0 14px;
    padding: 10px 12px;
    background: var(--grey-light);
    border: 2px solid;
    border-color: var(--white) var(--grey-dark) var(--grey-dark) var(--white);
}

.runner-label {
    display: block;
    margin: 4px 0;
    font-size: 0.85rem;
    font-weight: bold;
}

.code-edit {
    display: block;
    width: 100%;
    padding: 8px 10px;
    color: #ffd6e8;
    background: var(--ink);
    font-family: "Courier New", monospace;
    font-size: 0.9rem;
    line-height: 1.4;
    tab-size: 4;
    white-space: pre;
    overflow-x: auto;
    resize: vertical;
    border: 2px inset var(--grey);
}

.run-inputs {
    color: var(--yellow);
}

.runner .button-row {
    margin: 8px 0;
}

.runner-status {
    font-size: 0.85rem;
    font-weight: bold;
}

.rev pre.run-out {
    margin: 0;
    color: #39ff14;
    background: #111;
    white-space: pre-wrap;
}

.run-images img {
    display: block;
    margin-top: 8px;
    background: var(--white);
}

/* ----------------------------------------------------------
   Phones: scrolling nav, scoreboard that doesn't stick
   ---------------------------------------------------------- */
@media (max-width: 600px) {
    .rev-nav {
        flex-wrap: nowrap;
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 6px;
    }

    .rev-nav a {
        flex-shrink: 0;
    }

    .scoreboard {
        position: static;
    }

    .rev-header .big-num {
        font-size: 6rem;
        bottom: -24px;
    }

    .rev .window-body {
        padding: 10px;
    }

    .time-bar {
        font-size: 0.65rem;
    }
}

/* Print: hide the clutter, show every mark scheme and output */
@media print {
    body {
        background: none;
    }

    .rev-nav,
    .rev-toc,
    .pager,
    .q-answer,
    .q-tools,
    .scoreboard,
    .mock-bar,
    .copy-btn,
    .run-btn,
    .runner,
    .out-label .button {
        display: none !important;
    }

    .rev-layout {
        display: block;
    }

    .ms,
    pre.out {
        display: block !important;
    }

    .window {
        box-shadow: none;
        break-inside: avoid-page;
    }

    /* One knowledge organiser per printed page */
    .ko-page {
        break-after: page;
    }

    .ko-page:last-child {
        break-after: auto;
    }

    .ko-print-intro,
    .rev-header .big-num {
        display: none !important;
    }

    .ko > div {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
}