/* CS Judge — base: tokens, shell, forms, shared chrome */

/* CS Judge — base: tokens, shell, forms, shared chrome */

:root {
  --bg: #f6f4f4;
  --bg-gradient-top: #fdf0f2;
  --surface: #ffffff;
  --surface-muted: #faf7f7;
  --surface-hover: #fff9fa;
  --text: #1a2332;
  --muted: #5c6b7a;
  --border: #e4d8da;
  --school-red: #b0151e;
  --accent: #b0151e;
  --accent-mid: #9b1219;
  --accent-dark: #7a0e14;
  --accent-light: #d9303a;
  --accent-gradient: linear-gradient(135deg, #d9303a 0%, #b0151e 52%, #7a0e14 100%);
  --accent-gradient-soft: linear-gradient(160deg, #fff6f7 0%, #fce9ec 42%, #f6f4f4 100%);
  --accent-gradient-hover: linear-gradient(135deg, #c01822 0%, #8a1017 55%, #6a0c11 100%);
  --pass: #1f8a4c;
  --fail: #c0392b;
  --pending: #c27c1a;
  --unsolved: #8a96a3;
  --shadow: 0 8px 24px rgba(122, 14, 20, 0.08);
  --radius: 12px;
  --mono: "Consolas", "Cascadia Mono", "SFMono-Regular", monospace;
  --code-bg: #0f1722;
  --code-text: #e8eef7;
  --chip-bg: #fde8eb;
  --chip-text: #8a1017;
  --upload-bg: #fffbfc;
  --bar-bg: #efe4e6;
  --toast-bg: #2a1216;
  --toast-text: #fff;
  --input-bg: #ffffff;
  --badge-pass-bg: #e6f6ec;
  --badge-fail-bg: #fdecea;
  --badge-pending-bg: #fff4e5;
  --badge-unsolved-bg: #eef1f4;
  --badge-manual-bg: #fde8eb;
  --manual-accent: #b0151e;
  --verdict-pass-bg: #f1fbf5;
  --verdict-pass-border: #b9e3c9;
  --verdict-fail-bg: #fff6f5;
  --verdict-fail-border: #f2c4bf;
  --verdict-pending-bg: #fffaf0;
  --verdict-pending-border: #f2d7a8;
  --mascot-watermark-opacity: 0.045;
}

[data-theme="dark"] {
  --bg: #121014;
  --bg-gradient-top: #1a1216;
  --surface: #1c181a;
  --surface-muted: #241e21;
  --surface-hover: #2c2226;
  --text: #e8eef4;
  --muted: #9aa8b8;
  --border: #3d2d32;
  --accent: #e85a62;
  --accent-mid: #c42e38;
  --accent-dark: #b0151e;
  --accent-light: #f08088;
  --accent-gradient: linear-gradient(135deg, #f08088 0%, #d9303a 45%, #b0151e 100%);
  --accent-gradient-soft: linear-gradient(160deg, #241a1d 0%, #1c1417 55%, #121014 100%);
  --accent-gradient-hover: linear-gradient(135deg, #f08088 0%, #b0151e 60%, #7a0e14 100%);
  --pass: #3ecf7a;
  --fail: #f07167;
  --pending: #e8a84a;
  --unsolved: #7a8796;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  --code-bg: #0a0f14;
  --code-text: #d4dce8;
  --chip-bg: #3a2228;
  --chip-text: #f5a8ad;
  --upload-bg: #1e181b;
  --bar-bg: #3d2d32;
  --toast-bg: #2a1216;
  --toast-text: #e8eef4;
  --input-bg: #141012;
  --badge-pass-bg: #1a3328;
  --badge-fail-bg: #3a2220;
  --badge-pending-bg: #3a2e1a;
  --badge-unsolved-bg: #252d38;
  --badge-manual-bg: #3a2228;
  --manual-accent: #e85a62;
  --verdict-pass-bg: #1a2e24;
  --verdict-pass-border: #2d5c42;
  --verdict-fail-bg: #2e1f1e;
  --verdict-fail-border: #5c3530;
  --verdict-pending-bg: #2e2818;
  --verdict-pending-border: #5c4a28;
  --mascot-watermark-opacity: 0.035;
}

* { box-sizing: border-box; }

:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--accent-gradient-soft);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.25s, color 0.25s;
  position: relative;
}

.page-watermark {
  position: fixed;
  right: -2.5rem;
  bottom: -3rem;
  width: min(22rem, 42vw);
  height: auto;
  opacity: var(--mascot-watermark-opacity);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

#app {
  position: relative;
  z-index: 1;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: flex-end;
  position: relative;
}

.topbar-more-btn {
  display: none;
}

.topbar-more-menu {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.topbar-more-menu .nav-btn {
  white-space: nowrap;
}

.student-topbar-id {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--muted);
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-muted);
  white-space: nowrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  font-size: 1.2rem;
  cursor: pointer;
  border: none;
  background: transparent;
  color: inherit;
  padding: 0;
  font-family: inherit;
}

.brand-mark {
  width: 1.85rem;
  height: auto;
  flex-shrink: 0;
  opacity: 0.9;
}

.brand span {
  color: var(--accent);
  margin-left: 0.25rem;
}

.nav { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.nav-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.92rem;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.nav-btn.active {
  background: var(--accent-gradient);
  border-color: var(--accent-mid);
  color: #fff;
}

.nav-btn.ghost { background: transparent; }

.icon-btn {
  width: 2.4rem;
  height: 2.4rem;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  border-radius: 50%;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  transition: background 0.25s, border-color 0.25s;
}

.login-panel {
  max-width: 440px;
  margin: clamp(2rem, 6vh, 3.5rem) auto;
  padding: 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  border-left: 4px solid var(--accent);
}

body.login-view-active::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--bg) 58%, transparent) 0%,
      color-mix(in srgb, var(--bg) 42%, transparent) 42%,
      color-mix(in srgb, var(--bg) 62%, transparent) 100%
    ),
    url("/static/images/ghibli.jpg") center 38% / cover no-repeat;
  pointer-events: none;
}

[data-theme="dark"] body.login-view-active::before {
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--bg) 72%, transparent) 0%,
      color-mix(in srgb, var(--bg) 58%, transparent) 42%,
      color-mix(in srgb, var(--bg) 78%, transparent) 100%
    ),
    url("/static/images/ghibli.jpg") center 38% / cover no-repeat;
  filter: brightness(0.58) saturate(0.88);
}

body.login-view-active .topbar {
  background: color-mix(in srgb, var(--surface) 84%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

body.login-view-active .page-watermark {
  opacity: 0.02;
}

body.login-view-active #login-view.login-panel {
  background: color-mix(in srgb, var(--surface) 90%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 14px 42px rgba(26, 35, 50, 0.14);
}

[data-theme="dark"] body.login-view-active #login-view.login-panel {
  background: color-mix(in srgb, var(--surface) 86%, transparent);
  box-shadow: 0 14px 42px rgba(0, 0, 0, 0.38);
}

body.login-view-active .login-hero {
  background: color-mix(in srgb, var(--surface) 50%, transparent);
}

.login-student {
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.login-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
  padding: 2rem 2rem 0.25rem;
  background: var(--accent-gradient-soft);
  border-bottom: 1px solid var(--border);
}

.login-hero-mark {
  width: 3.5rem;
  height: auto;
  opacity: 0.96;
}

.login-hero-kicker {
  margin: 0;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  line-height: 1.3;
}

.login-hero-title {
  margin: 0;
  font-size: clamp(1.65rem, 4.5vw, 1.95rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--text);
}

.login-hero-lead {
  margin: 0.15rem 0 0;
  max-width: 34ch;
  font-size: 1.02rem;
  line-height: 1.62;
  color: var(--muted);
}

.login-form-wrap {
  padding: 0 2rem;
}

.login-form label {
  margin-top: 0;
}

.login-form label:not(:first-of-type) {
  margin-top: 0.85rem;
}

.login-form .login-submit-btn {
  margin-top: 1.15rem;
}

.login-footer {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 0 2rem 2rem;
}

.login-footer-hint {
  display: flex;
  flex-direction: column;
  gap: 0.12rem;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--muted);
}

.login-footer-hint-line {
  display: block;
  white-space: nowrap;
}

[hidden] {
  display: none !important;
}

.login-pin-hint {
  margin: 0.5rem 0 0.75rem;
}

.login-id-pin-notice {
  margin: 0 2rem;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface-muted);
  font-size: 0.9rem;
  line-height: 1.55;
  text-align: center;
}

.login-forgot-pin {
  margin: 0.35rem 0 0.75rem;
  color: var(--muted);
}

.login-field-error {
  margin: 0.35rem 0 0.65rem;
  color: var(--fail);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.4;
}

.login-deep-link-hint {
  margin: 0 2rem;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--verdict-pending-border);
  background: var(--verdict-pending-bg);
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.55;
  text-align: left;
}

#login-form label[hidden],
#login-form input[hidden] {
  display: none;
}

.topbar-course-label {
  margin-right: 0.35rem;
  font-size: 0.82rem;
  color: var(--muted);
  white-space: nowrap;
}

.login-back-btn {
  margin-bottom: 1rem;
}

.ghost-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 0.55rem 1rem;
  border-radius: 8px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.ghost-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

.subtitle, .hint { color: var(--muted); }

form label {
  display: block;
  text-align: left;
  margin: 1rem 0 0.35rem;
  font-weight: 600;
}

input[type="text"],
input[type="password"],
input[type="number"],
input:not([type]) {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--input-bg);
  color: var(--text);
}

button.primary,
.primary {
  margin-top: 1rem;
  width: 100%;
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  padding: 0.8rem 1rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, filter 0.2s;
}

button.primary:hover,
.primary:hover {
  background: var(--accent-gradient-hover);
  filter: brightness(1.03);
}

.system-health-banner {
  padding: 0.65rem 1.25rem;
  background: var(--verdict-fail-bg);
  border-bottom: 1px solid var(--verdict-fail-border);
  color: var(--fail);
  font-size: 0.92rem;
  font-weight: 600;
}

.confirm-dialog {
  position: fixed;
  inset: 0;
  z-index: 1100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.confirm-dialog[hidden] {
  display: none;
}

.confirm-dialog-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 15, 22, 0.55);
}

.confirm-dialog-panel {
  position: relative;
  width: min(440px, 100%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.35rem 1.35rem;
}

.confirm-dialog-panel h3 {
  margin: 0 0 0.5rem;
}

.confirm-dialog-message {
  margin: 0 0 1.15rem;
  color: var(--text);
  line-height: 1.5;
}

.confirm-dialog-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.65rem;
}

.confirm-dialog-confirm--danger {
  background: var(--fail);
  border-color: var(--fail);
}

.confirm-dialog-confirm--danger:hover {
  filter: brightness(0.92);
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge.pass { background: var(--badge-pass-bg); color: var(--pass); }

.badge.fail { background: var(--badge-fail-bg); color: var(--fail); }

.badge.pending { background: var(--badge-pending-bg); color: var(--pending); }

.badge.unsolved { background: var(--badge-unsolved-bg); color: var(--unsolved); }

.badge.manual { background: var(--badge-manual-bg); color: var(--manual-accent); }

/* Mid-Course Portfolio Check-In */

/* Foundational Workshop */

/* Module 1 — Modernization Sprint */

/* Module 1 — Collections Utility */

/* Module 9 — Capstone Project */

/* Shared module assignment polish */

.link-btn {
  border: none;
  background: none;
  padding: 0;
  color: var(--accent);
  font: inherit;
  font-size: 0.92rem;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.link-btn:hover {
  color: var(--accent-dark);
}

@media (max-width: 480px) {
.login-hero,
  .login-form-wrap,
  .login-footer {
    padding-left: 1.45rem;
    padding-right: 1.45rem;
  }
.login-id-pin-notice,
  .login-deep-link-hint {
    margin-left: 1.45rem;
    margin-right: 1.45rem;
  }
.login-footer {
    padding-bottom: 1.65rem;
  }
}

.trace-array {
  display: inline-block;
  white-space: nowrap;
}

.trace-array-inner {
  display: inline;
}

.trace-array-comma {
  color: var(--muted);
}

.trace-array-elem {
  display: inline-block;
  padding: 0.1rem 0.35rem;
  margin: 0 0.05rem;
  border-radius: 5px;
  border: 1px solid transparent;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.trace-array-elem--sorted {
  background: var(--badge-pass-bg);
  border-color: var(--verdict-pass-border);
  color: var(--pass);
}

.trace-array-elem--swap {
  background: var(--chip-bg);
  border-color: var(--accent);
  color: var(--chip-text);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 25%, transparent);
}

.trace-array-elem--sorted.trace-array-elem--swap {
  background: color-mix(in srgb, var(--badge-pass-bg) 55%, var(--chip-bg));
  border-color: var(--accent);
  color: var(--chip-text);
}

.trace-array-elem--bubble {
  background: var(--chip-bg);
  border-color: var(--accent-light);
  color: var(--chip-text);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent-light) 35%, transparent);
}

.trace-array-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.25rem;
  margin-top: 0.65rem;
  padding: 0.55rem 0.15rem 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.trace-array-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.trace-array-legend-label {
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 500;
}

@media (max-width: 720px) {
.trace-array {
    white-space: normal;
  }
.trace-array-inner {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 0.2rem 0.1rem;
    max-width: 100%;
  }
.trace-array-comma {
    display: none;
  }
}

.jump-submit-btn {
  border: 1px solid var(--border);
  background: var(--surface-muted);
  color: var(--accent);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
}

.jump-submit-btn:hover {
  background: var(--chip-bg);
}

.meta { color: var(--muted); font-size: 0.92rem; }

.section-block {
  margin-top: 1.4rem;
  padding-top: 1.35rem;
  border-top: 1px solid var(--border);
}

.section-block h3 { margin: 0 0 0.75rem; font-size: 1rem; }

pre, .code-block {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.45;
  white-space: pre-wrap;
}

.chip {
  background: var(--chip-bg);
  color: var(--chip-text);
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  font-size: 0.82rem;
}

.chip-link {
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.chip-link:hover,
.chip-link:focus-visible {
  background: var(--accent);
  color: var(--accent-contrast, #fff);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 35%, transparent);
  outline: none;
}

.back-btn {
  border: none;
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  padding: 0;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.submit-file-preview {
  margin-top: 0.75rem;
}

.submit-file-preview-label {
  margin: 0 0 0.35rem;
}

.submit-file-preview-list {
  margin: 0;
  padding-left: 1.2rem;
}

.submit-file-error {
  margin-top: 0.65rem;
}

.submit-hint {
  margin: 0 0 0.65rem;
}

.help-badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  background: var(--chip-bg);
  color: var(--chip-text);
}

.help-badge.detailed {
  background: var(--badge-pending-bg);
  color: var(--pending);
}

.help-badge.maximum {
  background: var(--badge-fail-bg);
  color: var(--fail);
}

.fix-issue {
  margin: 0 0 0.75rem;
  font-weight: 600;
  color: var(--text);
}

.replacements {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.replacement-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface);
}

.rep-row {
  padding: 0.6rem 0.8rem;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 0.6rem;
  align-items: start;
  font-size: 0.9rem;
}

.rep-row:first-child { border-top: none; }

.rep-label {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  padding-top: 0.15rem;
}

.rep-row.instead code { color: var(--fail); }

.rep-row.do-this code { color: var(--pass); font-weight: 600; }

.rep-row.how-to span:last-child { color: var(--text); line-height: 1.45; }

.rep-row code {
  font-family: var(--mono);
  font-size: 0.84rem;
  white-space: pre-wrap;
  word-break: break-word;
}

.fix-steps-title {
  margin: 0.5rem 0 0.35rem;
  font-size: 0.92rem;
}

.fix-steps {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text);
}

.fix-steps li {
  margin-bottom: 0.35rem;
  line-height: 1.45;
}

.bar {
  height: 8px;
  background: var(--bar-bg);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 0.5rem;
}

.bar > span {
  display: block;
  height: 100%;
  background: var(--accent-gradient);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th, td {
  text-align: left;
  padding: 0.55rem 0.4rem;
  border-bottom: 1px solid var(--border);
}

.inline-form {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.inline-form .primary { width: auto; margin-top: 0; }

/* Teacher dashboard — classroom monitors (1280×1024, 1920×1080) */

#toast {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 100;
  background: var(--toast-bg);
  color: var(--toast-text);
  padding: 0.8rem 1rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
  pointer-events: none;
}

.step-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
  flex-shrink: 0;
}

.check-item-label { font-weight: 600; }

.check-item-detail { color: var(--muted); font-size: 0.85rem; margin-top: 0.15rem; }

.check-status.pass { color: var(--pass); font-weight: 700; }

.check-status.fail { color: var(--fail); font-weight: 700; }

.check-status.warn { color: var(--pending); font-weight: 700; }

.check-status.skip { color: var(--unsolved); font-weight: 700; }

.view-loading {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.view-loading--compact {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.view-loading-label {
  margin: 0 0 0.15rem;
}

.skeleton {
  border-radius: 8px;
  background: linear-gradient(
    90deg,
    var(--bar-bg) 0%,
    var(--surface-hover) 45%,
    var(--bar-bg) 90%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.2s ease-in-out infinite;
}

.skeleton-title {
  height: 1.65rem;
  width: min(18rem, 72%);
}

.skeleton-line {
  height: 0.85rem;
  width: 100%;
}

.skeleton-line--short {
  width: 55%;
}

.skeleton-stat {
  flex: 1 1 8rem;
  height: 3.25rem;
  min-width: 6rem;
}

.view-error h3 {
  margin: 0 0 0.5rem;
}

.view-error-message {
  margin: 0 0 1rem;
  color: var(--muted);
  line-height: 1.5;
}

.view-error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

@keyframes skeleton-shimmer {
  0% { background-position: 100% 0; }
  100% { background-position: -100% 0; }
}

@media (max-width: 720px) {
.topbar-more-btn {
    display: inline-flex;
  }
.topbar-more-menu {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 0.35rem);
    flex-direction: column;
    align-items: stretch;
    min-width: 11rem;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
    z-index: 20;
  }
.topbar-more-menu.is-open {
    display: flex;
  }
.topbar-more-menu .nav-btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 640px) {
.topbar { flex-wrap: wrap; gap: 0.75rem; }
.student-topbar-id { font-size: 0.8rem; }
}

/* CS 110 closing — Explore, Create, Understand */

/* CS Judge — student: problems, detail, progress, submit/feedback */

/* CS Judge — teacher dashboard */

.primary:focus-visible,
.back-btn:focus-visible,
.grading-banner-link:focus-visible,
.teacher-recent-row:focus-visible,
.matrix-cell-btn:focus-visible,
.resources-toc-link:focus-visible,
.resources-chapter-card:focus-visible,
.resources-section-toc-link:focus-visible,
.resources-back-top:focus-visible,
.icon-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.problem-row:focus-visible,
.history-item:focus-visible,
.teacher-recent-row:focus-visible {
  background: var(--surface-hover);
}

.login-teacher-entry {
  margin-top: 0.5rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--border);
}

.login-teacher-entry .ghost-btn {
  width: 100%;
}

@media (min-width: 1280px) {
body.teacher-dashboard-active #login-teacher-back-btn {
    grid-column: 1;
    margin-bottom: 0.35rem;
  }
}

/* CS Judge — content pages: about, resources, github, course overview */

.login-about-entry {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

.login-about-entry .link-btn {
  display: block;
  padding: 0.1rem 0;
  max-width: 100%;
}