/* Kelas Interaktif — Pemrograman Dasar C++
   Dirancang untuk diproyeksikan di kelas: kontras tinggi, teks besar. */

:root {
  --bg: #0e1420;
  --bg-soft: #151d2c;
  --panel: #1b2537;
  --panel-2: #223049;
  --border: #2c3a52;
  --text: #e8eef7;
  --muted: #9aabc4;
  --accent: #4da3ff;
  --accent-soft: #1e3a5c;
  --ok: #3ddc97;
  --ok-soft: #10402f;
  --bad: #ff6b6b;
  --bad-soft: #4a1f24;
  --warn: #ffc857;

  --code-key: #ff9ecd;
  --code-type: #7ee3ff;
  --code-str: #b8e986;
  --code-num: #ffc857;
  --code-com: #6f819c;
  --code-pre: #c8a2ff;
  --code-fn: #ffd9a0;

  --radius: 14px;
  --gap: 18px;
  --fs-code: 1.15rem;
}

:root[data-theme="light"] {
  --bg: #f4f7fc;
  --bg-soft: #ffffff;
  --panel: #ffffff;
  --panel-2: #eef3fa;
  --border: #d3ddec;
  --text: #16202f;
  --muted: #5b6b83;
  --accent: #1667d1;
  --accent-soft: #dfeaFB;
  --ok: #12855c;
  --ok-soft: #dff5ea;
  --bad: #c5303a;
  --bad-soft: #fbe3e5;
  --warn: #9a6800;

  --code-key: #b3006b;
  --code-type: #0b6b86;
  --code-str: #2c6e2f;
  --code-num: #9a6800;
  --code-com: #6a7a91;
  --code-pre: #6b3fbe;
  --code-fn: #8a5200;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 17px;
  line-height: 1.6;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* ------------------------------------------------------------- topbar --- */

.topbar {
  display: flex;
  align-items: center;
  gap: var(--gap);
  padding: 12px 20px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  background: var(--accent);
  color: #fff;
  font-weight: 800;
  padding: 6px 10px;
  border-radius: 10px;
  letter-spacing: -0.5px;
}

:root[data-theme="light"] .brand-mark { color: #fff; }

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text small { color: var(--muted); font-size: 0.78rem; }

.meeting-picker {
  display: flex;
  align-items: stretch;
  gap: 5px;
}

.meeting-picker select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 9px 12px;
  font-size: 0.95rem;
  font-family: inherit;
  max-width: 340px;
  cursor: pointer;
}

.meeting-picker select:hover { border-color: var(--accent); }

/* Cadangan bila daftar bawaan peramban bermasalah. */
.step-btn {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0 11px;
  font-size: 0.8rem;
  font-family: inherit;
  cursor: pointer;
}

.step-btn:hover { border-color: var(--accent); }
.step-btn:disabled { opacity: 0.3; cursor: default; }

.modes {
  display: flex;
  gap: 6px;
  background: var(--panel);
  padding: 5px;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.mode-btn {
  background: transparent;
  border: 0;
  color: var(--muted);
  padding: 8px 15px;
  border-radius: 9px;
  cursor: pointer;
  font-size: 0.93rem;
  font-family: inherit;
  font-weight: 600;
}

.mode-btn:hover { color: var(--text); }

.mode-btn.is-active {
  background: var(--accent);
  color: #fff;
}

.tools {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.score {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 13px;
  font-size: 0.9rem;
  color: var(--muted);
  white-space: nowrap;
}

.score #score { color: var(--accent); font-weight: 800; font-size: 1.05rem; }
.streak { color: var(--warn); margin-left: 6px; }

.tool-btn {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 0.95rem;
  font-family: inherit;
  min-width: 44px;
}

.tool-btn:hover { border-color: var(--accent); }
.tool-btn.is-running { background: var(--warn); color: #201800; border-color: var(--warn); font-weight: 700; }
.tool-btn.is-done { background: var(--bad); color: #fff; border-color: var(--bad); font-weight: 700; }

/* --------------------------------------------------------------- view --- */

.view {
  flex: 1;
  overflow-y: auto;
  padding: 22px 26px 30px;
}

.card {
  max-width: 1180px;
  margin: 0 auto;
}

.card-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.pill {
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  padding: 3px 11px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.card h2 {
  margin: 0;
  font-size: 1.5rem;
}

.card .lead {
  color: var(--muted);
  margin: 4px 0 20px;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  align-items: start;
}

@media (max-width: 1000px) {
  .split { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.panel-head {
  padding: 10px 15px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.panel-body { padding: 15px; }
.panel-body.tight { padding: 0; }

/* --------------------------------------------------------------- code --- */

.code {
  margin: 0;
  padding: 15px 15px 15px 0;
  overflow-x: auto;
  font-family: "Cascadia Code", "Consolas", "SF Mono", monospace;
  font-size: var(--fs-code);
  line-height: 1.55;
  tab-size: 4;
}

.code .ln {
  display: inline-block;
  width: 3.2em;
  padding-right: 1em;
  text-align: right;
  color: var(--code-com);
  user-select: none;
}

.tok-key { color: var(--code-key); font-weight: 600; }
.tok-type { color: var(--code-type); }
.tok-str { color: var(--code-str); }
.tok-num { color: var(--code-num); }
.tok-com { color: var(--code-com); font-style: italic; }
.tok-pre { color: var(--code-pre); }
.tok-fn { color: var(--code-fn); }

textarea.editor {
  width: 100%;
  min-height: 320px;
  background: var(--bg);
  color: var(--text);
  border: 0;
  border-top: 1px solid var(--border);
  padding: 14px;
  font-family: "Cascadia Code", "Consolas", "SF Mono", monospace;
  font-size: var(--fs-code);
  line-height: 1.55;
  tab-size: 4;
  resize: vertical;
  outline: none;
}

textarea.answer {
  width: 100%;
  min-height: 130px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 1.1rem;
  line-height: 1.5;
  resize: vertical;
  outline: none;
}

textarea.answer:focus, textarea.editor:focus { border-color: var(--accent); }

input.stdin {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 11px;
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 0.98rem;
  outline: none;
}

pre.output {
  margin: 0;
  padding: 13px;
  background: var(--bg);
  border-radius: 10px;
  border: 1px solid var(--border);
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 1.05rem;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 3em;
  max-height: 340px;
  overflow: auto;
}

pre.output.is-ok { border-color: var(--ok); }
pre.output.is-bad { border-color: var(--bad); }
pre.output .ws { color: var(--code-com); }

/* ------------------------------------------------------------ buttons --- */

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 15px;
}

.btn {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 20px;
  font-size: 1rem;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
}

.btn:hover { border-color: var(--accent); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { filter: brightness(1.1); }
.btn-ghost { background: transparent; color: var(--muted); }

.nav-btn {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 18px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}

.nav-btn:hover { border-color: var(--accent); }
.nav-btn:disabled { opacity: 0.35; cursor: default; }

/* ------------------------------------------------------------ feedback -- */

.feedback {
  margin-top: 16px;
  border-radius: 12px;
  padding: 15px 17px;
  border: 1px solid var(--border);
  background: var(--panel);
  display: none;
}

.feedback.show { display: block; }
.feedback.is-ok { border-color: var(--ok); background: var(--ok-soft); }
.feedback.is-bad { border-color: var(--bad); background: var(--bad-soft); }

.feedback h4 {
  margin: 0 0 7px;
  font-size: 1.12rem;
}

.feedback p { margin: 0; }
.feedback .why { margin-top: 9px; color: var(--text); opacity: 0.92; }

/* --------------------------------------------------------------- quiz --- */

.options { display: grid; gap: 11px; margin-top: 8px; }

.option {
  text-align: left;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 15px 18px;
  font-size: 1.05rem;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  gap: 13px;
  align-items: flex-start;
  line-height: 1.5;
}

.option:hover:not(:disabled) { border-color: var(--accent); }
.option:disabled { cursor: default; }
.option .key {
  background: var(--panel-2);
  border-radius: 7px;
  min-width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 0.92rem;
  flex-shrink: 0;
}

.option.is-correct { border-color: var(--ok); background: var(--ok-soft); }
.option.is-correct .key { background: var(--ok); color: #04231a; }
.option.is-wrong { border-color: var(--bad); background: var(--bad-soft); }
.option.is-wrong .key { background: var(--bad); color: #fff; }

/* ---------------------------------------------------------- challenge --- */

.brief {
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  padding: 13px 16px;
  margin-bottom: 16px;
}

.tests { display: grid; gap: 9px; margin-top: 12px; }

.test-row {
  display: grid;
  grid-template-columns: 30px 1fr auto;
  gap: 11px;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 13px;
  font-size: 0.95rem;
}

.test-row.is-ok { border-color: var(--ok); }
.test-row.is-bad { border-color: var(--bad); }
.test-row .mark { font-size: 1.15rem; text-align: center; }
.test-row.is-ok .mark { color: var(--ok); }
.test-row.is-bad .mark { color: var(--bad); }
.test-row .detail {
  grid-column: 1 / -1;
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 0.92rem;
  color: var(--muted);
  white-space: pre-wrap;
  border-top: 1px dashed var(--border);
  padding-top: 8px;
  margin-top: 2px;
}

.hints { margin-top: 14px; }
.hint {
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 3px solid var(--warn);
  border-radius: 9px;
  padding: 10px 14px;
  margin-bottom: 8px;
  font-size: 0.97rem;
}

/* ----------------------------------------------------------- assignment --- */

.muted { color: var(--muted); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.assignment-title-row,
.grading-toolbar,
.grade-student-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
}

.deadline-chip {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  padding: 10px 14px;
  border: 1px solid var(--accent);
  border-radius: 10px;
  background: var(--accent-soft);
}

.deadline-chip small { color: var(--muted); }

.identity-grid {
  display: grid;
  grid-template-columns: 2fr 1.2fr 1fr;
  gap: 14px;
  margin-bottom: 16px;
}

.identity-grid label,
.grading-login label,
.rubric-fields label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
}

.form-input {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 11px;
  font: inherit;
  outline: none;
}

.form-input:focus { border-color: var(--accent); }

.assignment-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(340px, 0.75fr);
  gap: var(--gap);
  align-items: start;
}

.assignment-side { display: grid; gap: 14px; }
.assignment-editor { min-height: 560px; border-top: 0; }

.file-button,
.mini-btn {
  display: inline-flex;
  align-items: center;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 5px 9px;
  font: inherit;
  font-size: 0.82rem;
  text-transform: none;
  letter-spacing: 0;
  cursor: pointer;
}

.file-button input { display: none; }
.file-button:hover, .mini-btn:hover { border-color: var(--accent); }

.field-help,
.manual-note {
  margin: 0;
  padding: 9px 14px;
  color: var(--muted);
  font-size: 0.88rem;
}

.manual-note { text-align: center; padding-top: 15px; }
.preflight-panel { max-height: 440px; overflow: auto; }
.assignment-actions { align-items: center; }
.assignment-actions .btn-primary { margin-left: auto; }

.server-state {
  max-width: 420px;
  color: var(--muted);
  font-size: 0.88rem;
}

.server-state.is-ok { color: var(--ok); }
.server-state.is-bad { color: var(--bad); }

.check-summary {
  margin-bottom: 10px;
  padding: 7px 10px;
  border-radius: 8px;
  background: var(--panel-2);
}

.check-summary.is-ok { color: var(--ok); }
.check-summary.is-bad { color: var(--bad); }
.check-list { display: grid; gap: 7px; }

.check-item {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 7px;
  font-size: 0.9rem;
}

.check-item > span { font-weight: 800; }
.check-item.is-ok > span { color: var(--ok); }
.check-item.is-bad > span { color: var(--bad); }
.check-item strong { display: block; }
.check-item small { display: block; color: var(--muted); font-weight: 400; }

.receipt-box { max-width: 760px; margin: 18px auto 0; }
.receipt-grid { display: grid; grid-template-columns: max-content 1fr; gap: 5px 14px; }
.receipt-grid span { color: var(--muted); }
.receipt-grid code { overflow-wrap: anywhere; }

/* -------------------------------------------------------------- grading --- */

.grading-login { max-width: 680px; }
.grading-login .panel { max-width: 560px; }
.grading-card { max-width: 1500px; }
.grading-toolbar { margin-bottom: 16px; }
.grading-toolbar .actions { margin-top: 0; justify-content: flex-end; }

.grading-layout {
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  gap: var(--gap);
  align-items: start;
}

.submission-sidebar {
  position: sticky;
  top: 0;
  max-height: calc(100vh - 180px);
  overflow: auto;
}

.submission-filters {
  position: sticky;
  top: 0;
  z-index: 1;
  display: grid;
  gap: 9px;
  padding: 12px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--border);
}

.checkbox-label { color: var(--muted); font-size: 0.86rem; }
.submission-list { display: grid; }

.submission-item {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  width: 100%;
  padding: 12px;
  background: transparent;
  color: var(--text);
  border: 0;
  border-bottom: 1px solid var(--border);
  text-align: left;
  font: inherit;
  cursor: pointer;
}

.submission-item:hover { background: var(--panel-2); }
.submission-item.is-active { background: var(--accent-soft); box-shadow: inset 3px 0 var(--accent); }
.submission-item span { min-width: 0; }
.submission-item strong, .submission-item small { display: block; }
.submission-item small { color: var(--muted); font-size: 0.76rem; overflow-wrap: anywhere; }
.submission-meta { flex-shrink: 0; text-align: right; }
.submission-meta b { display: block; color: var(--accent); font-size: 0.88rem; }
.empty-list { padding: 16px; color: var(--muted); }

.grade-student-head { margin-bottom: 14px; }
.grade-student-head h3 { margin: 0; font-size: 1.3rem; }
.grade-student-head p { margin: 2px 0 0; color: var(--muted); }
.grade-status { text-align: right; }
.grade-status strong, .grade-status small { display: block; }
.grade-status strong { color: var(--accent); font-size: 1.2rem; }
.grade-status small { color: var(--muted); }

.grade-review-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.72fr);
  gap: var(--gap);
  align-items: start;
}

.grade-review-grid > div { display: grid; gap: 14px; }
.grade-code { max-height: 660px; overflow: auto; }
.grade-code .code { font-size: 0.92rem; }
.grade-output-panel pre { max-height: 420px; }
.rubric-fields { display: grid; gap: 11px; }
.rubric-fields label:not(:last-of-type) { grid-template-columns: 1fr 100px; align-items: center; }
.rubric-fields label span small { color: var(--muted); }
.feedback-input { min-height: 110px; resize: vertical; }
.grade-total { display: flex; justify-content: space-between; border-top: 1px solid var(--border); padding-top: 10px; }
.grade-total strong { color: var(--accent); font-size: 1.15rem; }

@media (max-width: 1100px) {
  .assignment-grid,
  .grade-review-grid { grid-template-columns: 1fr; }
  .grading-layout { grid-template-columns: 280px minmax(0, 1fr); }
}

@media (max-width: 780px) {
  .identity-grid,
  .grading-layout { grid-template-columns: 1fr; }
  .assignment-title-row,
  .grading-toolbar { flex-direction: column; }
  .submission-sidebar { position: static; max-height: 380px; }
  .assignment-actions .btn-primary { margin-left: 0; }
  .deadline-chip { width: 100%; }
}

/* ------------------------------------------------------------ bottombar - */

.bottombar {
  display: flex;
  align-items: center;
  gap: var(--gap);
  padding: 12px 22px;
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
}

.progress {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 13px;
  max-width: 620px;
  margin: 0 auto;
}

.progress-track {
  flex: 1;
  height: 8px;
  background: var(--panel-2);
  border-radius: 99px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 99px;
  transition: width 0.25s ease;
}

#progressLabel { color: var(--muted); font-size: 0.9rem; white-space: nowrap; }

.done-state {
  text-align: center;
  padding: 60px 20px;
}

.done-state .big { font-size: 3.4rem; margin-bottom: 10px; }
.done-state h2 { margin: 0 0 8px; }
.done-state p { color: var(--muted); }

kbd {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 1px 7px;
  font-size: 0.85em;
  font-family: inherit;
}

/* Peringatan bila modul gagal dimuat (dibuka lewat file:// tanpa server). */
.startup-warning {
  max-width: 720px;
  margin: 40px auto;
  background: var(--panel);
  border: 1px solid var(--bad);
  border-left: 5px solid var(--bad);
  border-radius: var(--radius);
  padding: 24px 28px;
}

.startup-warning h2 { margin: 0 0 12px; color: var(--bad); font-size: 1.3rem; }
.startup-warning p { margin: 0 0 10px; }
.startup-warning ol { margin: 0 0 10px; padding-left: 22px; }
.startup-warning li { margin-bottom: 6px; }
.startup-warning hr { border: 0; border-top: 1px solid var(--border); margin: 16px 0; }
.startup-warning code {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px 6px;
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 0.92em;
}

/* Mode presentasi: teks lebih besar saat layar penuh. */
:fullscreen { --fs-code: 1.4rem; }
:fullscreen body { font-size: 19px; }