/* ==========================================================================
 * CEDRF PSU / GATE CBT - interface styles
 * Self-contained: no external fonts, icons or CDNs, so the site renders
 * identically offline, on file://, and inside sandboxed previews.
 * ========================================================================== */

:root {
  --navy: #0d2b52;
  --navy-2: #123a6d;
  --navy-3: #1b4f8f;
  --saffron: #ff9933;
  --green: #138808;
  --ink: #16202e;
  --ink-2: #41506a;
  --ink-3: #6c7a92;
  --line: #dde3ec;
  --line-2: #eaeef5;
  --bg: #f4f6fa;
  --card: #ffffff;
  --danger: #c0392b;
  --warn: #e07b00;
  --gold: #d4a017;
  --ok: #1f7a4d;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 32, 56, .06), 0 6px 18px rgba(16, 32, 56, .07);
  --shadow-lg: 0 8px 30px rgba(13, 43, 82, .16);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--navy-3); }
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; color: var(--navy); }
h1 { font-size: 1.72rem; letter-spacing: -.015em; }
h2 { font-size: 1.28rem; }
h3 { font-size: 1.03rem; }
p { margin: 0 0 .8em; }
code, pre, .mono { font-family: var(--mono); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------------------------------------------------------------- layout -- */
.shell { max-width: 1280px; margin: 0 auto; padding: 0 20px 72px; }
.topbar {
  background: linear-gradient(100deg, var(--navy) 0%, var(--navy-2) 58%, var(--navy-3) 100%);
  color: #fff; border-bottom: 3px solid var(--saffron);
  position: sticky; top: 0; z-index: 60;
}
.topbar-in {
  max-width: 1280px; margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; color: #fff; }
.brand-logo {
  width: 40px; height: 40px; border-radius: 9px; flex: 0 0 auto; object-fit: cover;
  background: #fff; box-shadow: 0 1px 4px rgba(0, 0, 0, .35);
}
.brand-txt b { display: block; font-size: 15.5px; letter-spacing: .2px; }
.brand-txt span { display: block; font-size: 10px; opacity: .8; letter-spacing: .25px; line-height: 1.35; }
.nav { display: flex; gap: 3px; margin-left: auto; flex-wrap: wrap; }
.nav a {
  color: #e7edf7; text-decoration: none; font-size: 13.5px; font-weight: 550;
  padding: 8px 12px; border-radius: 8px; border: 1px solid transparent;
  transition: background .15s, border-color .15s;
}
.nav a:hover { background: rgba(255, 255, 255, .12); }
.nav a.active { background: rgba(255, 255, 255, .18); border-color: rgba(255, 255, 255, .28); color: #fff; }

.view { display: none; animation: fade .18s ease; }
.view.active { display: block; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* ---------------------------------------------------------------- cards -- */
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px 22px; margin-bottom: 18px;
}
.card.tight { padding: 15px 17px; }
.card h2:first-child, .card h3:first-child { margin-top: 0; }
.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); }
.g3 { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.g4 { grid-template-columns: repeat(auto-fit, minmax(178px, 1fr)); }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.row.end { justify-content: flex-end; }
.row.between { justify-content: space-between; }
.spacer { flex: 1; }
.muted { color: var(--ink-3); }
.small { font-size: 13px; }
.tiny { font-size: 11.5px; }
.nowrap { white-space: nowrap; }
.center { text-align: center; }
hr.sep { border: 0; border-top: 1px solid var(--line); margin: 18px 0; }

/* --------------------------------------------------------------- hero --- */
.hero {
  background:
    radial-gradient(1100px 420px at 12% -10%, rgba(255, 153, 51, .16), transparent 62%),
    radial-gradient(900px 400px at 96% 0%, rgba(19, 136, 8, .13), transparent 60%),
    linear-gradient(120deg, var(--navy) 0%, var(--navy-2) 60%, var(--navy-3) 100%);
  color: #fff; border-radius: 14px; padding: 30px 30px 26px; margin: 20px 0 22px;
  box-shadow: var(--shadow-lg); position: relative; overflow: hidden;
}
.hero:after {
  content: ""; position: absolute; inset: auto -60px -90px auto; width: 320px; height: 320px;
  border-radius: 50%; background: rgba(255, 255, 255, .05);
}
.hero h1 { color: #fff; font-size: 1.95rem; margin-bottom: .35em; max-width: 22ch; }
.hero-logo {
  width: 74px; height: 74px; border-radius: 14px; object-fit: cover; background: #fff;
  box-shadow: 0 4px 18px rgba(0, 0, 0, .3); margin-bottom: 12px;
}
.hero p { color: #d7e1f0; max-width: 74ch; }
.hero .pills { display: flex; gap: 8px; flex-wrap: wrap; margin: 14px 0 4px; }
.stat-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(132px, 1fr)); gap: 12px; margin-top: 20px; }
.stat {
  background: rgba(255, 255, 255, .10); border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 10px; padding: 12px 14px; backdrop-filter: blur(2px);
}
.stat b { display: block; font-size: 1.5rem; line-height: 1.1; color: #fff; }
.stat span { font-size: 11.5px; text-transform: uppercase; letter-spacing: .6px; color: #c3d2e6; }

/* ------------------------------------------------------------- buttons -- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  background: var(--navy-2); color: #fff; border: 1px solid var(--navy-2);
  padding: 9px 16px; border-radius: 8px; font: inherit; font-size: 14px; font-weight: 600;
  cursor: pointer; text-decoration: none; transition: filter .13s, transform .06s, background .15s;
  white-space: nowrap;
}
.btn:hover { filter: brightness(1.12); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.primary { background: var(--saffron); border-color: var(--saffron); color: #33200a; }
.btn.green { background: var(--green); border-color: var(--green); }
.btn.ghost { background: transparent; color: var(--navy-2); border-color: var(--line); }
.btn.ghost:hover { background: #f0f4fa; }
.btn.danger { background: var(--danger); border-color: var(--danger); }
.btn.sm { padding: 6px 11px; font-size: 13px; }
.btn.lg { padding: 12px 22px; font-size: 15.5px; }
.btn.on-light { background: #fff; color: var(--navy); border-color: rgba(255, 255, 255, .7); }
.btnrow { display: flex; gap: 9px; flex-wrap: wrap; }

/* -------------------------------------------------------------- inputs -- */
label.fld { display: block; margin-bottom: 13px; }
label.fld > span { display: block; font-size: 12.5px; font-weight: 650; color: var(--ink-2); margin-bottom: 4px; }
input[type=text], input[type=email], input[type=number], input[type=date], select, textarea {
  width: 100%; padding: 9px 11px; border: 1px solid var(--line); border-radius: 8px;
  font: inherit; font-size: 14px; color: var(--ink); background: #fff;
}
input:focus, select:focus, textarea:focus { outline: 2px solid rgba(27, 79, 143, .35); outline-offset: 1px; border-color: var(--navy-3); }
.chk { display: flex; align-items: flex-start; gap: 8px; margin: 7px 0; font-size: 14px; cursor: pointer; }
.chk input { margin-top: 3px; }

/* -------------------------------------------------------------- badges -- */
.pill {
  display: inline-block; padding: 3px 9px; border-radius: 999px; font-size: 11.5px;
  font-weight: 650; background: #eef2f8; color: var(--ink-2); border: 1px solid var(--line);
  letter-spacing: .2px;
}
.pill.safron, .pill.saffron { background: #fff3e2; color: #8a4b00; border-color: #ffd9a8; }
.pill.green { background: #e6f5ea; color: #14603a; border-color: #b7e0c4; }
.pill.navy { background: #e8eefb; color: var(--navy-2); border-color: #c7d6f2; }
.pill.red { background: #fdecea; color: #8e2b20; border-color: #f5c6c0; }
.pill.grey { background: #f1f3f7; color: var(--ink-3); }

/* ------------------------------------------------------- exam chooser --- */
.exam-card {
  display: block; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 17px 18px; text-decoration: none; color: inherit; box-shadow: var(--shadow);
  transition: transform .12s, box-shadow .12s, border-color .12s; position: relative;
}
.exam-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: #c3d2ea; }
.exam-card h3 { margin: 0 0 5px; font-size: 1.02rem; }
.exam-card .org { font-size: 12px; color: var(--ink-3); margin-bottom: 8px; }
.exam-card .tag { font-size: 13px; color: var(--ink-2); margin-bottom: 12px; min-height: 2.6em; }
.exam-meta { display: flex; gap: 14px; flex-wrap: wrap; font-size: 12px; color: var(--ink-2); border-top: 1px dashed var(--line); padding-top: 10px; }
.exam-meta b { color: var(--navy); }

/* ------------------------------------------------------- CBT interface --- */
.cbt { display: flex; flex-direction: column; min-height: 100vh; background: #fff; }
.cbt-head {
  background: var(--navy); color: #fff; padding: 8px 14px;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap; border-bottom: 3px solid var(--saffron);
}
.cbt-head .who { display: flex; align-items: center; gap: 9px; }
.avatar {
  width: 34px; height: 34px; border-radius: 50%; background: var(--saffron); color: #33200a;
  display: grid; place-items: center; font-weight: 800; font-size: 14px;
}
.cbt-head .ttl { font-size: 13.5px; font-weight: 650; }
.cbt-head .sub { font-size: 11.5px; opacity: .8; }
.timer {
  margin-left: auto; font-family: var(--mono); font-size: 22px; font-weight: 700;
  letter-spacing: .5px; background: #fff; color: var(--navy); padding: 4px 13px; border-radius: 7px;
  border: 2px solid var(--saffron);
}
.timer.warn { color: #8a4b00; border-color: var(--warn); }
.timer.danger { color: #fff; background: var(--danger); border-color: var(--danger); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .62; } }

.cbt-body { display: flex; flex: 1; min-height: 0; }
.cbt-main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.cbt-scroll { flex: 1; overflow-y: auto; padding: 20px 26px 26px; }

.secbar { background: #eef2f8; border-bottom: 1px solid var(--line); padding: 7px 26px; font-size: 12.5px; color: var(--ink-2); display: flex; gap: 16px; flex-wrap: wrap; }
.secbar b { color: var(--navy); }

.qhead { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 14px; flex-wrap: wrap; }
.qnum {
  background: var(--navy); color: #fff; font-weight: 700; font-size: 13px;
  min-width: 34px; height: 30px; padding: 0 9px; border-radius: 6px; display: grid; place-items: center;
}
.qmeta { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.qtext { font-size: 16px; line-height: 1.68; margin-bottom: 16px; white-space: pre-wrap; }
.qtext pre { background: #f7f9fc; border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; overflow-x: auto; font-size: 13.5px; line-height: 1.5; white-space: pre; }
.qtext table { border-collapse: collapse; margin: 10px 0; font-size: 13.5px; }
.qtext table td, .qtext table th { border: 1px solid var(--line); padding: 5px 10px; }

.opts { list-style: none; margin: 0 0 8px; padding: 0; display: grid; gap: 9px; }
.opt {
  display: flex; gap: 11px; align-items: flex-start; padding: 11px 13px;
  border: 1.5px solid var(--line); border-radius: 9px; cursor: pointer; background: #fff;
  transition: border-color .12s, background .12s;
}
.opt:hover { border-color: #b9c9e2; background: #fafcff; }
.opt.sel { border-color: var(--navy-3); background: #eef4fd; box-shadow: inset 0 0 0 1px var(--navy-3); }
.opt input { margin-top: 3px; flex: 0 0 auto; }
.opt .ltr { font-weight: 750; color: var(--navy); min-width: 18px; }
.opt .txt { flex: 1; white-space: pre-wrap; }
.opt.correct { border-color: var(--ok); background: #eaf6ef; }
.opt.wrong { border-color: var(--danger); background: #fdecea; }

.natbox { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.natbox input { max-width: 240px; font-family: var(--mono); font-size: 16px; }

.cbt-foot {
  border-top: 1px solid var(--line); background: #fbfcfe; padding: 10px 26px;
  display: flex; gap: 9px; align-items: center; flex-wrap: wrap;
}
.legend { display: flex; gap: 12px; flex-wrap: wrap; font-size: 11.5px; color: var(--ink-2); }
.legend span { display: inline-flex; align-items: center; gap: 5px; }
.dot { width: 13px; height: 13px; border-radius: 3px; border: 1px solid rgba(0, 0, 0, .18); display: inline-block; }
.dot.answered { background: #2e9e5b; }
.dot.marked { background: #7b3fbf; }
.dot.marked-answered { background: linear-gradient(135deg, #7b3fbf 50%, #2e9e5b 50%); }
.dot.notvisited { background: #d7dce5; }
.dot.notanswered { background: #e2483d; }

/* palette */
.palette { width: 268px; flex: 0 0 auto; border-left: 1px solid var(--line); background: #fbfcfe; display: flex; flex-direction: column; }
.palette-h { padding: 11px 14px; border-bottom: 1px solid var(--line); font-size: 12.5px; font-weight: 700; color: var(--navy); text-transform: uppercase; letter-spacing: .5px; }
.palette-b { flex: 1; overflow-y: auto; padding: 12px 14px; }
.pgrid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 7px; }
.pbtn {
  aspect-ratio: 1; border-radius: 7px; border: 1px solid rgba(0, 0, 0, .16); background: #d7dce5;
  font: inherit; font-size: 13px; font-weight: 700; color: #243044; cursor: pointer; padding: 0;
  display: grid; place-items: center; transition: transform .08s;
}
.pbtn:hover { transform: scale(1.07); }
.pbtn.answered { background: #2e9e5b; color: #fff; }
.pbtn.notanswered { background: #e2483d; color: #fff; }
.pbtn.marked { background: #7b3fbf; color: #fff; }
.pbtn.marked-answered { background: linear-gradient(135deg, #7b3fbf 50%, #2e9e5b 50%); color: #fff; }
.pbtn.cur { outline: 3px solid var(--saffron); outline-offset: 1px; }
.palette-f { padding: 11px 14px; border-top: 1px solid var(--line); font-size: 11.5px; color: var(--ink-3); }

/* ----------------------------------------------------------- results ---- */
.score-hero { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; }
.big-score {
  background: linear-gradient(140deg, var(--navy), var(--navy-3)); color: #fff;
  border-radius: 12px; padding: 20px; text-align: center;
}
.big-score b { display: block; font-size: 2.5rem; line-height: 1.05; }
.big-score span { font-size: 12px; text-transform: uppercase; letter-spacing: .7px; opacity: .82; }
.kpi { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 15px 17px; text-align: center; }
.kpi b { display: block; font-size: 1.62rem; color: var(--navy); line-height: 1.15; }
.kpi span { font-size: 11.5px; text-transform: uppercase; letter-spacing: .5px; color: var(--ink-3); }
.kpi.ok b { color: var(--ok); } .kpi.bad b { color: var(--danger); } .kpi.warn b { color: var(--warn); }

table.tbl { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.tbl th, table.tbl td { text-align: left; padding: 9px 11px; border-bottom: 1px solid var(--line-2); }
table.tbl th { background: #f5f8fc; color: var(--ink-2); font-size: 11.5px; text-transform: uppercase; letter-spacing: .5px; font-weight: 700; }
table.tbl tr:hover td { background: #fafcff; }
table.tbl td.num, table.tbl th.num { text-align: right; font-variant-numeric: tabular-nums; }
table.tbl.compact td, table.tbl.compact th { padding: 6px 9px; }

.bar { height: 7px; border-radius: 4px; background: #e8edf5; overflow: hidden; min-width: 70px; }
.bar > i { display: block; height: 100%; border-radius: 4px; background: var(--navy-3); }
.bar.ok > i { background: var(--ok); } .bar.warn > i { background: var(--warn); } .bar.bad > i { background: var(--danger); }

.review-item { border: 1px solid var(--line); border-radius: 10px; padding: 15px 17px; margin-bottom: 13px; background: #fff; }
.review-item.correct { border-left: 4px solid var(--ok); }
.review-item.wrong { border-left: 4px solid var(--danger); }
.review-item.skipped { border-left: 4px solid var(--ink-3); }
.expl { background: #f6f9fc; border: 1px solid var(--line); border-left: 3px solid var(--navy-3); border-radius: 8px; padding: 12px 14px; margin-top: 11px; font-size: 14px; white-space: pre-wrap; }
.expl b.lbl { color: var(--navy); }
.src-link { font-size: 12px; color: var(--ink-3); margin-top: 9px; }

/* --------------------------------------------------------- analytics ---- */
.mastery-row { display: grid; grid-template-columns: minmax(150px, 1.6fr) 62px 1fr 92px; gap: 11px; align-items: center; padding: 8px 0; border-bottom: 1px solid var(--line-2); font-size: 13.5px; }
.mastery-row:last-child { border-bottom: 0; }
.mastery-row .nm { font-weight: 600; }
.mastery-row .nm small { display: block; font-weight: 400; color: var(--ink-3); font-size: 11.5px; }
.band { font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 999px; color: #fff; text-align: center; white-space: nowrap; }

.weak-item {
  border: 1px solid var(--line); border-left: 4px solid var(--warn); border-radius: 9px;
  padding: 13px 15px; margin-bottom: 11px; background: #fff;
}
.weak-item.critical { border-left-color: var(--danger); }
.weak-item h4 { margin: 0 0 4px; font-size: 14.5px; }

/* ---------------------------------------------------------- roadmap ----- */
.phase { border-left: 3px solid var(--saffron); padding: 0 0 18px 18px; margin-left: 6px; position: relative; }
.phase:before { content: ""; position: absolute; left: -8px; top: 2px; width: 13px; height: 13px; border-radius: 50%; background: var(--saffron); border: 3px solid #fff; box-shadow: 0 0 0 1px var(--line); }
.phase h3 { margin-bottom: 3px; }
.day-row { display: flex; gap: 10px; align-items: baseline; padding: 7px 0; border-bottom: 1px dashed var(--line-2); font-size: 13.5px; }
.day-row b { min-width: 68px; color: var(--navy); font-variant-numeric: tabular-nums; }
.chk-list { list-style: none; padding: 0; margin: 0; }
.chk-list li { padding: 6px 0 6px 26px; position: relative; font-size: 14px; border-bottom: 1px solid var(--line-2); }
.chk-list li:before { content: "\2713"; position: absolute; left: 4px; color: var(--green); font-weight: 800; }

/* ------------------------------------------------------------- misc ----- */
.notice { background: #fff8e8; border: 1px solid #f2dfa8; border-left: 4px solid var(--gold); border-radius: 9px; padding: 13px 15px; margin-bottom: 16px; font-size: 13.5px; }
.notice.info { background: #eef4fd; border-color: #c7d8f2; border-left-color: var(--navy-3); }
.notice.ok { background: #eaf6ef; border-color: #b7e0c4; border-left-color: var(--ok); }
.notice.bad { background: #fdecea; border-color: #f5c6c0; border-left-color: var(--danger); }
.notice b { color: var(--navy); }
pre.code-block {
  background: #0f1c2e; color: #d7e5f7; border-radius: 9px; padding: 14px 16px; overflow-x: auto;
  font-size: 12.8px; line-height: 1.6; margin: 10px 0;
}
pre.code-block .c { color: #7fa6d4; }
kbd { background: #eef2f8; border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 4px; padding: 1px 5px; font-family: var(--mono); font-size: 12px; }
.chips { display: flex; gap: 7px; flex-wrap: wrap; }
.chip { border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 5px 12px; font-size: 13px; cursor: pointer; user-select: none; }
.chip.on { background: var(--navy-2); color: #fff; border-color: var(--navy-2); }
.footer-note { text-align: center; color: var(--ink-3); font-size: 12.5px; padding: 26px 0 8px; }
.loading { text-align: center; padding: 46px 20px; color: var(--ink-3); }
.spinner { width: 26px; height: 26px; border: 3px solid var(--line); border-top-color: var(--navy-3); border-radius: 50%; margin: 0 auto 12px; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.empty { text-align: center; padding: 40px 20px; color: var(--ink-3); }
.empty .big { font-size: 2.2rem; margin-bottom: 8px; opacity: .5; }

/* ---------------------------------------------------------- responsive -- */
@media (max-width: 900px) {
  .cbt-body { flex-direction: column-reverse; }
  .palette { width: 100%; border-left: 0; border-top: 1px solid var(--line); max-height: 210px; }
  .pgrid { grid-template-columns: repeat(9, 1fr); }
  .cbt-scroll { padding: 15px; }
  .cbt-foot, .secbar { padding-left: 15px; padding-right: 15px; }
  .mastery-row { grid-template-columns: 1fr 56px; }
  .mastery-row .bar, .mastery-row .band { grid-column: span 1; }
  .hero { padding: 22px 18px; }
  .hero h1 { font-size: 1.5rem; }
}
@media print {
  .topbar, .cbt-foot, .palette, .btn, .nav { display: none !important; }
  .card { box-shadow: none; border-color: #bbb; page-break-inside: avoid; }
  body { background: #fff; }
}

/* ----------------------------------------------------------- guided tour -- */
.tour-backdrop {
  position: fixed; inset: 0; background: rgba(10, 18, 32, .62); z-index: 900;
  animation: fade .2s ease;
}
.tour-spot {
  position: fixed; z-index: 901; border-radius: 12px; pointer-events: none;
  box-shadow: 0 0 0 4px #ff9933, 0 0 0 9999px rgba(10, 18, 32, .62);
  transition: top .18s ease, left .18s ease, width .18s ease, height .18s ease;
  background: transparent;
}
.tour-card {
  position: fixed; z-index: 902; width: 340px; max-width: calc(100vw - 24px);
  background: #fff; border-radius: 12px; padding: 16px 18px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, .4); border-top: 4px solid #ff9933;
}
.tour-card h3 { margin: 4px 0 6px; font-size: 15.5px; }
.tour-card p { font-size: 13.5px; color: #41506a; margin-bottom: 12px; }