/* Μελέτη σε υπολογιστή — the subscriber web reader. Same palette as the rest of the Aepp site. */
:root {
  --blue: #1a5ebd;
  --blue-deep: #123f80;
  --blue-soft: #dde7fa;
  --slate: #cfd7ed;
  --green: #1e8e4f;
  --green-soft: #e3f4ea;
  --red: #c62d3a;
  --red-soft: #fde7e9;
  --amber-soft: #fff4e5;
  --orange: #ffa53a;
  --bg: #f5f6fb;
  --card: #ffffff;
  --text: #171c2b;
  --muted: #5a6275;
  --border: #e1e5f0;
  --code-bg: #1f2433;
  --code-text: #e8ecf6;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body { font-family: "Manrope", system-ui, sans-serif; background: var(--bg); color: var(--text); line-height: 1.65; min-height: 100vh; }
a { color: var(--blue); }
[hidden] { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: .9rem; }
h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; line-height: 1.15; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 20px; padding: 24px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 24px; border-radius: 999px; border: 0; font: inherit; font-weight: 700; text-decoration: none; cursor: pointer; }
.btn-blue { background: var(--blue); color: #fff; }
.btn-blue:hover { background: var(--blue-deep); }
.btn-blue:disabled { opacity: .6; cursor: default; }
.btn.wide { width: 100%; }
.btn-text { background: none; border: 0; font: inherit; font-weight: 700; color: var(--blue); cursor: pointer; padding: 6px 0; }
.btn-text:hover { text-decoration: underline; }

.view { max-width: 1240px; margin: 0 auto; padding: 32px 16px 64px; }
.view-msg { display: flex; justify-content: center; padding-top: 72px; }
.narrow { max-width: 560px; }
.narrow h1 { font-size: 1.6rem; margin-bottom: 12px; }
.narrow p + p { margin-top: 16px; }

/* ---- pairing ---- */
.pair-wrap { display: grid; grid-template-columns: 1fr 380px; gap: 48px; align-items: center; padding-top: 24px; }
.eyebrow { color: var(--blue); font-weight: 800; letter-spacing: .02em; margin-bottom: 8px; }
.lead { color: var(--muted); font-size: 1.12rem; margin-top: 14px; max-width: 560px; }
.steps { margin: 28px 0 20px; padding-left: 0; list-style: none; counter-reset: step; display: grid; gap: 14px; max-width: 560px; }
.steps li { counter-increment: step; position: relative; padding-left: 46px; min-height: 30px; }
.steps li::before { content: counter(step); position: absolute; left: 0; top: -2px; width: 30px; height: 30px; border-radius: 50%; background: var(--blue-soft); color: var(--blue-deep); font-weight: 800; display: grid; place-items: center; }
.pair-card { display: grid; gap: 16px; text-align: center; }
.qr, .qr-placeholder { width: 240px; height: 240px; margin: 0 auto; border-radius: 16px; }
.qr svg { width: 100%; height: 100%; display: block; }
.qr-placeholder { background: repeating-linear-gradient(45deg, #eef1f8 0 10px, #f7f8fc 10px 20px); margin-bottom: 16px; }
.code-label { color: var(--muted); font-size: .9rem; }
.code { font-family: var(--mono); font-size: 1.7rem; font-weight: 600; letter-spacing: .12em; color: var(--blue-deep); }
.countdown { height: 6px; border-radius: 3px; background: var(--border); overflow: hidden; }
.countdown span { display: block; height: 100%; width: 100%; background: var(--blue); transform-origin: left; }
.expired { font-weight: 700; margin: 12px 0 16px; }
.public-pc { display: flex; gap: 12px; text-align: left; align-items: flex-start; padding-top: 16px; border-top: 1px solid var(--border); cursor: pointer; }
.public-pc input { width: 18px; height: 18px; margin-top: 4px; accent-color: var(--blue); flex: none; }
.pair-error { background: var(--red-soft); color: var(--red); border-radius: 12px; padding: 10px 14px; font-weight: 600; text-align: left; }

/* ---- reader ---- */
#view-reader { padding-top: 24px; }
.reader { display: grid; grid-template-columns: 300px 1fr; gap: 32px; align-items: start; }
.toc { position: sticky; top: 88px; max-height: calc(100vh - 104px); display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--border); border-radius: 20px; overflow: hidden; }
.toc-tabs { display: grid; grid-template-columns: 1fr 1fr; padding: 6px; gap: 6px; border-bottom: 1px solid var(--border); }
.toc-tabs button { border: 0; background: none; font: inherit; font-weight: 700; color: var(--muted); padding: 8px; border-radius: 12px; cursor: pointer; }
.toc-tabs button[aria-selected="true"] { background: var(--slate); color: var(--text); }
.toc-list { overflow-y: auto; padding: 8px; flex: 1; }
.toc-sep { font-size: .78rem; font-weight: 800; color: var(--muted); letter-spacing: .04em; padding: 14px 10px 6px; }
.toc details { border-radius: 12px; }
.toc summary { list-style: none; cursor: pointer; padding: 8px 10px; border-radius: 12px; font-weight: 700; line-height: 1.35; }
.toc summary::-webkit-details-marker { display: none; }
.toc summary:hover { background: var(--bg); }
.toc summary small { display: block; color: var(--muted); font-weight: 600; font-size: .78rem; }
.toc ol { list-style: none; padding: 0 0 6px 10px; }
.toc a { display: block; padding: 6px 10px; border-radius: 10px; color: var(--text); text-decoration: none; font-size: .92rem; line-height: 1.4; }
.toc a:hover { background: var(--bg); }
.toc a[aria-current="page"] { background: var(--blue-soft); color: var(--blue-deep); font-weight: 700; }
.toc a .sid { color: var(--muted); font-weight: 700; margin-right: 6px; }
.toc-exam { padding: 8px 10px; border-radius: 12px; }
.toc-exam p { font-weight: 700; font-size: .92rem; line-height: 1.35; }
.toc-exam .themes { display: flex; gap: 6px; margin-top: 6px; }
.toc-exam .themes a { width: 38px; text-align: center; padding: 4px 0; border: 1px solid var(--border); font-weight: 700; }
.toc-year { font-size: .78rem; font-weight: 800; color: var(--muted); padding: 12px 10px 2px; }
.toc-foot { border-top: 1px solid var(--border); padding: 12px 16px; }
.toc-toggle { display: none; }

.page { min-width: 0; }
.content { background: var(--card); border: 1px solid var(--border); border-radius: 20px; padding: 36px 44px; min-height: 360px; font-size: 1.06rem; }
.content > * + * { margin-top: 16px; }
.content .crumb { color: var(--muted); font-weight: 700; font-size: .9rem; }
.content h1 { font-size: clamp(1.45rem, 3vw, 1.9rem); margin-top: 6px; }
.content h2 { font-size: 1.35rem; font-weight: 800; }
.content h3 { font-size: 1.12rem; font-weight: 800; margin-top: 24px; }
.content ul, .content ol { padding-left: 24px; }
.content li + li { margin-top: 6px; }
.content .chip { display: inline-block; background: var(--blue-soft); color: var(--blue-deep); border-radius: 999px; padding: 2px 12px; font-size: .85rem; font-weight: 700; }
.content .def { background: var(--bg); border-radius: 14px; padding: 14px 18px; }
.content .def b { display: block; color: var(--blue-deep); }
.content .note { background: var(--amber-soft); border-left: 4px solid var(--orange); border-radius: 0 14px 14px 0; padding: 12px 18px; }
.content pre { background: var(--code-bg); color: var(--code-text); border-radius: 14px; padding: 16px 20px; overflow-x: auto; font-family: var(--mono); font-size: .92rem; line-height: 1.55; font-variant-ligatures: none; font-feature-settings: "liga" 0, "calt" 0; tab-size: 4; }
.content figure { text-align: center; }
.content figure img { max-width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--border); background: #fff; }
.content figure.small img { max-width: min(100%, 420px); }
.content figure .img-alt { display: inline-block; color: var(--muted); font-style: italic; padding: 12px; }
.content .table-wrap { overflow-x: auto; }
.content table { border-collapse: collapse; font-size: .95rem; }
.content th, .content td { border: 1px solid var(--border); padding: 6px 12px; text-align: left; }
.content th { background: var(--bg); font-weight: 800; }
.content .empty { color: var(--muted); text-align: center; padding: 80px 0; }

.subq { border-top: 1px solid var(--border); padding-top: 24px; margin-top: 28px; }
.subq > * + * { margin-top: 14px; }
.subq-head { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; }
.subq-head h3 { margin: 0; font-size: 1.15rem; }
.subq-head .pts { color: var(--muted); font-weight: 700; font-size: .9rem; }
.statements { list-style: none; padding: 0 !important; display: grid; gap: 8px; }
.statements li { display: grid; grid-template-columns: 28px 1fr; gap: 8px; }
.statements .num { font-weight: 800; color: var(--muted); }
.solution-toggle { background: var(--slate); color: var(--text); border: 0; border-radius: 999px; font: inherit; font-weight: 700; padding: 8px 18px; cursor: pointer; }
.solution-toggle:hover { background: #bfc9e3; }
.solution { border-left: 4px solid var(--green); background: var(--green-soft); border-radius: 0 14px 14px 0; padding: 16px 20px; }
.solution > * + * { margin-top: 12px; }
.solution .label { font-weight: 800; color: var(--green); }
.solution pre { margin-top: 10px; }
.tf { display: inline-block; font-weight: 800; border-radius: 8px; padding: 0 8px; margin-right: 6px; }
.tf.yes { background: var(--green); color: #fff; }
.tf.no { background: var(--red); color: #fff; }
.theme-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 16px; }
.pager a { display: inline-flex; flex-direction: column; max-width: 48%; padding: 12px 18px; border-radius: 16px; background: var(--card); border: 1px solid var(--border); text-decoration: none; color: var(--text); font-weight: 700; line-height: 1.35; }
.pager a small { color: var(--muted); font-weight: 600; }
.pager a.next { margin-left: auto; text-align: right; }
.pager a:hover { border-color: var(--blue); }

/* Faint repeated account mark over the reader (see study.js) */
.watermark { position: fixed; inset: 0; pointer-events: none; z-index: 40; background-repeat: repeat; opacity: 1; }
.print-block { display: none; }

@media (max-width: 960px) {
  .pair-wrap { grid-template-columns: 1fr; gap: 28px; }
  .pair-card { max-width: 420px; width: 100%; margin: 0 auto; }
  .reader { grid-template-columns: 1fr; gap: 12px; }
  .toc { position: static; max-height: 70vh; display: none; }
  .toc.open { display: flex; }
  .toc-toggle { display: inline-block; margin-bottom: 12px; background: var(--card); border: 1px solid var(--border); border-radius: 999px; padding: 8px 18px; font: inherit; font-weight: 700; cursor: pointer; }
  .content { padding: 24px 20px; }
}
@media (max-width: 480px) {
  .qr, .qr-placeholder { width: 200px; height: 200px; }
  .content { padding: 20px 16px; font-size: 1rem; }
  .pager a { max-width: 100%; }
}

@media print {
  body > *:not(.print-block) { display: none !important; }
  .print-block { display: block; padding: 48px; font: 700 1.2rem "Manrope", sans-serif; }
}
.pair-error.info { background: var(--blue-soft); color: var(--blue-deep); }
.content p, .content li, .content .note, .content .def { white-space: pre-line; }
/* No text selection in the reader (see blockCopy in study.js) */
#view-reader { -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }