/* inter-regular - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400;
  src: url('fonts/inter-v20-latin-regular.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* inter-italic - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Inter';
  font-style: italic;
  font-weight: 400;
  src: url('fonts/inter-v20-latin-italic.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* inter-500 - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Inter';
  font-style: normal;
  font-weight: 500;
  src: url('fonts/inter-v20-latin-500.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* inter-500italic - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Inter';
  font-style: italic;
  font-weight: 500;
  src: url('fonts/inter-v20-latin-500italic.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* inter-600 - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Inter';
  font-style: normal;
  font-weight: 600;
  src: url('fonts/inter-v20-latin-600.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* inter-600italic - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Inter';
  font-style: italic;
  font-weight: 600;
  src: url('fonts/inter-v20-latin-600italic.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* inter-700 - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Inter';
  font-style: normal;
  font-weight: 700;
  src: url('fonts/inter-v20-latin-700.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* inter-700italic - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Inter';
  font-style: italic;
  font-weight: 700;
  src: url('fonts/inter-v20-latin-700italic.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* inter-800 - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Inter';
  font-style: normal;
  font-weight: 800;
  src: url('fonts/inter-v20-latin-800.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}

/* poppins-regular - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 400;
  src: url('fonts/poppins-v24-latin-regular.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* poppins-italic - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Poppins';
  font-style: italic;
  font-weight: 400;
  src: url('fonts/poppins-v24-latin-italic.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* poppins-500 - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 500;
  src: url('fonts/poppins-v24-latin-500.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* poppins-500italic - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Poppins';
  font-style: italic;
  font-weight: 500;
  src: url('fonts/poppins-v24-latin-500italic.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* poppins-600 - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 600;
  src: url('fonts/poppins-v24-latin-600.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* poppins-600italic - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Poppins';
  font-style: italic;
  font-weight: 600;
  src: url('fonts/poppins-v24-latin-600italic.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* poppins-700 - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 700;
  src: url('fonts/poppins-v24-latin-700.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* poppins-700italic - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Poppins';
  font-style: italic;
  font-weight: 700;
  src: url('fonts/poppins-v24-latin-700italic.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* poppins-800 - latin */
@font-face {
  font-display: swap; /* Check https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display for other options. */
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 800;
  src: url('fonts/poppins-v24-latin-800.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}

:root {
  --surface-1:      #ffffff;
  --page-plane:     #f5f5f7;
  --text-primary:   #1d1d1f;
  --text-secondary: #6e6e73;
  --text-muted:     #707075; /* darkened from Apple's systemGray to clear 4.5:1 as small text */
  --gridline:       #d2d2d7;
  --border:         rgba(0,0,0,0.08);
  --nav-glass:      rgba(255,255,255,0.72);

  --accent:          #0071e3;
  --accent-hover:    #0070e0; /* darkened slightly so white button text clears 4.5:1 on hover */
  --accent-shadow:   rgba(0,113,227,0.35);

  --segment-track:   rgba(118,118,128,0.12);

  --status-good:     #34c759; /* systemGreen, reserved for done/correct */
  --status-warning:  #ff9500; /* systemOrange, reserved for in-progress */
  --status-neutral:  #86868b; /* systemGray, reserved for not-started */
  --status-bad:      #ff3b30; /* systemRed, reserved for incorrect */
  --status-good-text: #1e7a34; /* darker label variant of status-good, for use as text rather than a fill */
  --status-bad-text:  #d70015; /* darker label variant of status-bad, for use as text rather than a fill */

  --cat-linux:    #0071e3; /* systemBlue, shared with accent (foundational tier) */
  --cat-docker:   #0f8aa3; /* darkened from Apple's systemTeal so the section heading clears 3:1 */
  --cat-postgres: #5856d6; /* systemIndigo */
  --cat-perl:     #af52de; /* systemPurple */
  --cat-capstone: #ff2d55; /* systemPink */

  --card-shadow: 0 0.0625rem 0.125rem rgba(0,0,0,0.04), 0 0.25rem 1rem rgba(0,0,0,0.04);

  --radius-card: 1.125rem;
  --radius-control: 0.75rem;
  --radius-pill: 61.25rem;
  --ease: cubic-bezier(0.28, 0.11, 0.32, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --surface-1:      #1c1c1e;
    --page-plane:     #000000;
    --text-primary:   #f5f5f7;
    --text-secondary: #98989d;
    --text-muted:     #86868b; /* lightened so it clears 4.5:1 on dark surfaces */
    --gridline:       #38383a;
    --border:         rgba(255,255,255,0.12);
    --nav-glass:      rgba(0,0,0,0.72);

    --accent:          #0068d1; /* darkened from systemBlue so white button text clears 4.5:1 */
    --accent-hover:    #0f74d6;
    --accent-shadow:   rgba(0,104,209,0.45);

    --segment-track:   rgba(118,118,128,0.24);

    --status-good:     #30d158;
    --status-warning:  #ff9f0a;
    --status-neutral:  #98989d;
    --status-bad:      #ff453a;
    --status-good-text: var(--status-good); /* already >=4.5:1 as text on dark surfaces */
    --status-bad-text:  var(--status-bad);  /* already >=4.5:1 as text on dark surfaces */

    --cat-linux:    #0a84ff;
    --cat-docker:   #40c8e0;
    --cat-postgres: #5e5ce6;
    --cat-perl:     #bf5af2;
    --cat-capstone: #ff375f;

    --card-shadow: inset 0 0.0625rem 0 rgba(255,255,255,0.06), 0 0 0 0.0625rem rgba(255,255,255,0.05);
  }
}

/* Manual override via the theme toggle, wins over system preference either direction */
:root[data-theme="dark"] {
  --surface-1:      #1c1c1e;
  --page-plane:     #000000;
  --text-primary:   #f5f5f7;
  --text-secondary: #98989d;
  --text-muted:     #86868b; /* lightened so it clears 4.5:1 on dark surfaces */
  --gridline:       #38383a;
  --border:         rgba(255,255,255,0.12);
  --nav-glass:      rgba(0,0,0,0.72);

  --accent:          #0068d1; /* darkened from systemBlue so white button text clears 4.5:1 */
  --accent-hover:    #0f74d6;
  --accent-shadow:   rgba(0,104,209,0.45);

  --segment-track:   rgba(118,118,128,0.24);

  --status-good:     #30d158;
  --status-warning:  #ff9f0a;
  --status-neutral:  #98989d;
  --status-bad:      #ff453a;
  --status-good-text: var(--status-good); /* already >=4.5:1 as text on dark surfaces */
  --status-bad-text:  var(--status-bad);  /* already >=4.5:1 as text on dark surfaces */

  --cat-linux:    #0a84ff;
  --cat-docker:   #40c8e0;
  --cat-postgres: #5e5ce6;
  --cat-perl:     #bf5af2;
  --cat-capstone: #ff375f;

  --card-shadow: inset 0 0.0625rem 0 rgba(255,255,255,0.06), 0 0 0 0.0625rem rgba(255,255,255,0.05);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--page-plane);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6, .item-title {
  font-family: 'Poppins', -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

a { color: var(--accent); }

:focus-visible {
  outline: 0.125rem solid var(--accent);
  outline-offset: 0.125rem;
}

.app-header {
  background: var(--surface-1);
  border-bottom: 0.0625rem solid var(--border);
}

.header-inner {
  max-width: 56.25rem;
  margin: 0 auto;
  padding: 2rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

h1 { margin: 0; font-size: 1.6rem; font-weight: 600; letter-spacing: -0.02em; }
.subtitle { margin: 0.25rem 0 0; color: var(--text-secondary); font-size: 0.95rem; letter-spacing: -0.01em; }
.eyebrow { margin: 0.625rem 0 0; color: var(--text-primary); font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.eyebrow .arrow { color: var(--cat-docker); opacity: 0.6; }

.overall-progress {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  flex-shrink: 0;
}

.overall-progress-ring {
  width: 4rem;
  height: 4rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.95rem;
  background:
    radial-gradient(closest-side, var(--surface-1) 68%, transparent 69% 100%),
    conic-gradient(var(--accent) calc(var(--pct, 0) * 1%), var(--gridline) 0);
}

.overall-label { color: var(--text-muted); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.04em; }

.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--nav-glass);
  backdrop-filter: saturate(180%) blur(1.25rem);
  -webkit-backdrop-filter: saturate(180%) blur(1.25rem);
  border-bottom: 0.0625rem solid var(--border);
}

.site-nav-inner {
  max-width: 56.25rem;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-nav-links {
  display: flex;
  gap: 0.25rem;
}

.site-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  padding: 0.875rem 1rem;
  border-bottom: 0.125rem solid transparent;
  transition: color 0.2s var(--ease);
}

@media (min-width: 561px) {
  .site-nav-links a:first-child { padding-left: 0; }
}

.site-nav a:hover { color: var(--text-primary); }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 50%;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}
.theme-toggle:hover { background: var(--segment-track); color: var(--text-primary); }
.theme-toggle svg { width: 1.125rem; height: 1.125rem; }
.theme-toggle .icon-moon { display: none; }
.theme-toggle[data-mode="dark"] .icon-sun { display: none; }
.theme-toggle[data-mode="dark"] .icon-moon { display: block; }

.page-section {
  max-width: 56.25rem;
  margin: 0 auto;
  padding: 3rem 1.25rem;
  scroll-margin-top: 3.0625rem;
  border-bottom: 0.0625rem solid var(--gridline);
}

.page-section:last-child { border-bottom: none; }

#about { padding-top: 1.5rem; }

.page-section h2 { margin: 0 0 0.375rem; font-size: 1.4rem; font-weight: 600; letter-spacing: -0.02em; }
.section-intro { margin: 0 0 1.25rem; color: var(--text-secondary); letter-spacing: -0.01em; }

.content-card {
  background: var(--surface-1);
  border: 0.0625rem solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--card-shadow);
  padding: 1.25rem 1.375rem;
  margin-bottom: 0.875rem;
}
.content-card h3 { margin: 0 0 0.5rem; font-size: 1.02rem; font-weight: 600; letter-spacing: -0.01em; }
.content-card p { margin: 0; color: var(--text-secondary); }

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 0.875rem;
}
.about-grid .content-card { margin-bottom: 0; }

.skill-list { margin: 0; padding-left: 1.125rem; color: var(--text-secondary); }
.skill-list li { margin-bottom: 0.25rem; }

.placeholder-text { font-style: italic; color: var(--text-muted); }

.unlock-bar {
  background: var(--surface-1);
  border: 0.0625rem solid var(--border);
  border-radius: var(--radius-control);
  padding: 0.75rem 1rem;
  margin-bottom: 1.25rem;
}

.unlock-locked, .unlock-unlocked {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}
.unlock-locked.hidden, .unlock-unlocked.hidden { display: none; }

.unlock-locked input {
  flex: 1;
  max-width: 15rem;
  font-family: inherit;
  font-size: 0.88rem;
  padding: 0.5rem 0.625rem;
  border-radius: var(--radius-control);
  border: 0.0625rem solid var(--border);
  background: var(--page-plane);
  color: var(--text-primary);
}

.unlock-error { font-size: 0.82rem; color: var(--status-bad-text); }
.unlock-error.hidden { display: none; }

.unlock-status { font-size: 0.88rem; color: var(--status-good-text); font-weight: 500; }
.unlock-unlocked .notes-toggle { margin-top: 0; }

.tabs {
  display: inline-flex;
  gap: 0.125rem;
  background: var(--segment-track);
  padding: 0.1875rem;
  border-radius: var(--radius-pill);
  margin-bottom: 1.25rem;
}

.tab-btn {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  padding: 0.4375rem 1.125rem;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), transform 0.1s var(--ease);
}
.tab-btn:active { transform: scale(0.96); }

.tab-btn.active {
  background: var(--surface-1);
  color: var(--text-primary);
  font-weight: 600;
  box-shadow: 0 0.0625rem 0.1875rem rgba(0,0,0,0.12), 0 0.0625rem 0.0625rem rgba(0,0,0,0.08);
}

main {
  max-width: 56.25rem;
  margin: 0 auto;
  padding: 1.25rem;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---- Roadmap ---- */
.roadmap-section { margin-bottom: 1.75rem; }

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.section-header h2 { margin: 0; font-size: 1.3rem; font-weight: 600; letter-spacing: -0.01em; color: var(--item-accent, var(--text-primary)); }
.section-header .section-count { color: var(--text-muted); font-size: 0.85rem; }

.section-progress-track {
  height: 0.375rem;
  border-radius: 0.25rem;
  background: var(--gridline);
  overflow: hidden;
  display: flex;
  margin-bottom: 0.875rem;
}
.section-progress-fill-done { background: var(--status-good); height: 100%; }
.section-progress-fill-progress { background: var(--status-warning); height: 100%; }

.roadmap-item {
  background: var(--surface-1);
  border: 0.0625rem solid var(--border);
  border-left: 0.1875rem solid var(--item-accent, var(--gridline));
  border-radius: var(--radius-card);
  box-shadow: var(--card-shadow);
  padding: 1rem 1.125rem;
  margin-bottom: 0.625rem;
}

.item-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.item-title { font-weight: 600; margin: 0 0 0.25rem; letter-spacing: -0.01em; }
.item-desc { color: var(--text-secondary); font-size: 0.9rem; margin: 0; }

.status-select-wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.25rem;
  flex-shrink: 0;
}

.status-select {
  display: flex;
  gap: 0.25rem;
}

.locked-hint {
  font-size: 0.72rem;
  color: var(--text-muted);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}
.locked-hint.show { opacity: 1; }

.status-pill {
  border: 0.0625rem solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.76rem;
  font-weight: 500;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}
.status-pill[data-status="done"].active { background: var(--status-good); border-color: var(--status-good); color: #1d1d1f; }
.status-pill[data-status="in_progress"].active { background: var(--status-warning); border-color: var(--status-warning); color: #1d1d1f; }
.status-pill[data-status="not_started"].active { background: var(--status-neutral); border-color: var(--status-neutral); color: #1d1d1f; }
.status-pill[aria-disabled="true"] { cursor: not-allowed; }
.status-pill[aria-disabled="true"]:not(.active) { opacity: 0.5; color: var(--text-muted); }

.why-matters {
  margin-top: 0.625rem;
  padding: 0.625rem 0.75rem;
  background: var(--page-plane);
  border-left: 0.1875rem solid var(--item-accent, var(--accent));
  border-radius: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.why-matters strong { color: var(--text-primary); }

.notes-area {
  width: 100%;
  margin-top: 0.625rem;
  font-family: inherit;
  font-size: 0.88rem;
  padding: 0.5rem 0.625rem;
  border-radius: var(--radius-control);
  border: 0.0625rem solid var(--border);
  background: var(--page-plane);
  color: var(--text-primary);
  resize: vertical;
  min-height: 3.75rem;
}
.notes-area:read-only { cursor: default; opacity: 0.7; }

.notes-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.375rem;
}

.notes-saved {
  font-size: 0.75rem;
  color: var(--status-good-text);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}
.notes-saved.show { opacity: 1; }

/* ---- Quiz ---- */
.quiz-card {
  background: var(--surface-1);
  border: 0.0625rem solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--card-shadow);
  padding: 1.625rem;
}
.quiz-card.hidden { display: none; }
.quiz-card h2 { margin-top: 0; font-weight: 600; letter-spacing: -0.01em; }
.muted { color: var(--text-secondary); }

.topic-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.875rem 0;
}
.topic-btn {
  border: 0.0625rem solid var(--border);
  background: var(--page-plane);
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), transform 0.1s var(--ease);
}
.topic-btn:active { transform: scale(0.96); }
.topic-btn.selected {
  background: var(--text-primary);
  color: var(--page-plane);
  border-color: var(--text-primary);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.6875rem 1.5rem;
  border-radius: var(--radius-pill);
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease), transform 0.1s var(--ease);
}
.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  box-shadow: 0 0.375rem 1rem var(--accent-shadow);
  transform: translateY(-0.0625rem);
}
.btn-primary:active:not(:disabled) {
  transform: translateY(0) scale(0.97);
  box-shadow: 0 0.125rem 0.375rem var(--accent-shadow);
}
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary.hidden { display: none; }

.stats-panel { margin-top: 1.75rem; padding-top: 1.25rem; border-top: 0.0625rem solid var(--gridline); }
.stats-panel h3 { font-size: 0.98rem; font-weight: 600; letter-spacing: -0.01em; margin-bottom: 0.75rem; }

.stat-row {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  margin-bottom: 0.625rem;
  font-size: 0.86rem;
}
.stat-topic { width: 5.625rem; flex-shrink: 0; color: var(--text-secondary); }
.stat-track {
  flex: 1;
  height: 0.5rem;
  border-radius: 0.25rem;
  background: var(--gridline);
  overflow: hidden;
}
.stat-fill { height: 100%; transition: width 0.4s var(--ease); }
.stat-pct { width: 4.375rem; text-align: right; color: var(--text-muted); font-size: 0.8rem; }

.quiz-progress { color: var(--text-muted); font-size: 0.8rem; margin-bottom: 0.375rem; }
.quiz-topic-tag {
  display: inline-block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 0 0 0.375rem;
}

.choices { display: flex; flex-direction: column; gap: 0.5rem; margin: 1rem 0; }
.choice-btn {
  text-align: left;
  padding: 0.75rem 1rem;
  border: 0.0625rem solid var(--border);
  background: var(--page-plane);
  color: var(--text-primary);
  border-radius: var(--radius-control);
  cursor: pointer;
  font-size: 0.92rem;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.choice-btn:hover:not(:disabled) { border-color: var(--accent); }
.choice-btn:disabled { cursor: default; }
.choice-btn.correct { background: rgba(52,199,89,0.12); border-color: var(--status-good); }
.choice-btn.incorrect { background: rgba(255,59,48,0.12); border-color: var(--status-bad); }

.feedback {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-control);
  background: var(--page-plane);
  border: 0.0625rem solid var(--border);
  font-size: 0.88rem;
  margin-bottom: 0.875rem;
}
.feedback.hidden { display: none; }
.feedback .verdict { font-weight: 600; display: block; margin-bottom: 0.25rem; }
.feedback.is-correct .verdict { color: var(--status-good-text); }
.feedback.is-incorrect .verdict { color: var(--status-bad-text); }

.score-text { font-size: 1.1rem; margin-bottom: 1rem; }
#quiz-review { margin-bottom: 1.25rem; }
.review-item {
  padding: 0.625rem 0;
  border-bottom: 0.0625rem solid var(--gridline);
  font-size: 0.85rem;
}
.review-item .review-q { font-weight: 500; margin-bottom: 0.125rem; }
.review-item.wrong .review-q::before { content: "\2717  "; color: var(--status-bad-text); }
.review-item.right .review-q::before { content: "\2713  "; color: var(--status-good-text); }

@media (max-width: 560px) {
  .header-inner { flex-direction: column; align-items: flex-start; }
  .item-top { flex-direction: column; }
  .status-select-wrap { align-items: flex-start; margin-top: 0.5rem; }

  .site-nav-inner { padding: 0 0.75rem; }
  .site-nav-links { gap: 0; }
  .site-nav a {
    padding: 0.875rem 0.5rem;
    font-size: 0.82rem;
    white-space: nowrap;
  }
}