/* tuicr Learning - shared lesson stylesheet */

:root {
  --font-body: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-heading: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", Consolas, Menlo, monospace;
  --color-text: #1d1d1f;
  --color-muted: #6e6e73;
  --color-accent: #0a84ff;
  --color-accent-light: #e8f2ff;
  --color-bg: #fff;
  --color-code-bg: #f5f5f7;
  --color-border: #d2d2d7;
  --color-card-bg: #fbfbfd;
  --color-success: #34c759;
  --color-warning: #ff9f0a;
  --color-danger: #ff3b30;
  --max-width: 740px;
  --line-height: 1.58;
  --radius: 12px;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.06);
}

/* Dark mode (system preference) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-text: #f5f5f7;
    --color-muted: #a1a1a6;
    --color-accent: #64d2ff;
    --color-accent-light: rgba(100, 210, 255, 0.1);
    --color-bg: #000000;
    --color-code-bg: #1c1c1e;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-card-bg: rgba(28, 28, 30, 0.72);
    --color-success: #30d158;
    --color-warning: #ffd60a;
    --color-danger: #ff453a;
    --shadow-card: 0 1px 3px rgba(0,0,0,0.3), 0 4px 12px rgba(0,0,0,0.4);
  }
}

/* Dark mode (manual toggle) */
[data-theme="dark"] {
  --color-text: #f5f5f7;
  --color-muted: #a1a1a6;
  --color-accent: #64d2ff;
  --color-accent-light: rgba(100, 210, 255, 0.1);
  --color-bg: #000000;
  --color-code-bg: #1c1c1e;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-card-bg: rgba(28, 28, 30, 0.72);
  --color-success: #30d158;
  --color-warning: #ffd60a;
  --color-danger: #ff453a;
  --shadow-card: 0 1px 3px rgba(0,0,0,0.3), 0 4px 12px rgba(0,0,0,0.4);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: var(--line-height);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
}

main {
  width: 100%;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}

h1 {
  font-size: 2.4rem;
  margin-top: 0;
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 1.6rem;
  margin-top: 3rem;
}

h3 {
  font-size: 1.2rem;
}

p {
  margin-bottom: 1.2rem;
  color: var(--color-text);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: #0077ed;
  text-decoration: underline;
}

strong {
  font-weight: 600;
}

ul,
ol {
  margin-bottom: 1.2rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: var(--color-code-bg);
  padding: 0.2rem 0.45rem;
  border-radius: 6px;
  color: var(--color-text);
}

pre {
  position: relative;
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin-bottom: 1.75rem;
  line-height: 1.55;
  color: var(--color-text);
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.8rem;
  border-radius: 0;
}

table,
.command-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin-bottom: 1.75rem;
  font-size: 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-bg);
}

th,
td,
.command-table th,
.command-table td {
  padding: 0.65rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

th,
.command-table th {
  font-family: var(--font-heading);
  font-weight: 600;
  background: var(--color-code-bg);
  font-size: 0.82rem;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

tr:last-child td {
  border-bottom: none;
}

.lesson-meta {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 2.5rem;
  letter-spacing: 0.01em;
}

.lesson-top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  font-size: 0.88rem;
}

.lesson-top-nav a,
.lesson-nav a {
  color: var(--color-accent);
  font-weight: 500;
}

.nav-prev,
.nav-next,
.nav-home {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  min-width: 3rem;
}

.nav-home {
  justify-content: center;
  opacity: 0.68;
}

.nav-next {
  justify-content: flex-end;
}

.lesson-nav {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-heading);
  font-size: 0.88rem;
}

.callout,
.primary-source,
.ask-teacher,
.quiz,
.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.75rem;
  box-shadow: var(--shadow-card);
}

.callout-title,
.primary-source-label {
  display: block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
  color: var(--color-accent);
}

.callout.tip {
  border-color: var(--color-success);
}

.callout.tip .callout-title {
  color: var(--color-success);
}

.callout.warning {
  border-color: var(--color-warning);
}

.callout.warning .callout-title {
  color: var(--color-warning);
}

.callout.danger {
  border-color: var(--color-danger);
}

.callout.danger .callout-title {
  color: var(--color-danger);
}

.primary-source {
  border-color: var(--color-accent);
  box-shadow: 0 2px 8px rgba(10, 132, 255, 0.08);
}

.ask-teacher {
  background: linear-gradient(135deg, #f0fdf4, #ecfdf5);
  border-color: #bbf7d0;
  margin-top: 2.5rem;
  font-size: 0.9rem;
}

.diagram {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.75rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.4;
  white-space: pre;
  color: var(--color-text);
}

.quiz-question,
.quiz > p:first-child {
  font-weight: 600;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.quiz-options {
  display: block;
  list-style: none;
  padding: 0;
  margin-bottom: 0;
}

.quiz-options button,
.quiz-options li,
.action-button {
  display: block;
  width: 100%;
  padding: 0.7rem 1rem;
  margin-bottom: 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
  transition: all 0.2s;
  font: inherit;
  font-size: 0.9rem;
  text-align: left;
}

.quiz-options button:hover,
.quiz-options li:hover,
.action-button:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(10, 132, 255, 0.1);
}

.quiz-options button.correct,
.quiz-options li.correct {
  background: #e8f8ed;
  border-color: var(--color-success);
}

.quiz-options button.incorrect,
.quiz-options li.incorrect {
  background: #ffeaea;
  border-color: var(--color-danger);
}

.quiz-feedback {
  margin-top: 0.75rem;
  padding: 0.85rem 1rem;
  border-radius: 8px;
  display: none;
  font-size: 0.88rem;
  line-height: 1.5;
  font-weight: 400;
}

.quiz-feedback.show {
  display: block;
}

.quiz-feedback.correct {
  background: #e8f8ed;
  color: #1a7f37;
}

.quiz-feedback.incorrect {
  background: #ffeaea;
  color: #c33;
}

.checklist {
  padding-left: 1.5rem;
}

.course-header {
  margin-bottom: 3rem;
}

.course-header h1 {
  font-size: 2.8rem;
  letter-spacing: -0.035em;
  margin-bottom: 0.75rem;
}

.course-header p {
  color: var(--color-muted);
  font-size: 1.05rem;
  line-height: 1.5;
  max-width: 600px;
}

.section-label {
  font-family: var(--font-heading);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-left: 1rem;
}

.lesson-list {
  list-style: none;
  padding: 0;
  margin-bottom: 0;
}

.lesson-list li {
  margin-bottom: 0;
  padding: 0;
}

.lesson-card {
  display: grid;
  grid-template-columns: 2.5rem 1fr auto;
  gap: 1rem;
  align-items: baseline;
  padding: 1.1rem 1rem;
  text-decoration: none;
  color: var(--color-text);
  border-radius: 10px;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
}

.lesson-card:hover {
  background: var(--color-card-bg);
  transform: translateY(-1px);
  box-shadow: var(--shadow-card);
  text-decoration: none;
}

.lesson-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-muted);
  font-weight: 600;
}

.lesson-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.lesson-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-accent);
}

.lesson-desc {
  font-size: 0.85rem;
  color: var(--color-muted);
  line-height: 1.4;
}

.lesson-time {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-muted);
  white-space: nowrap;
  background: var(--color-code-bg);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.resources-link {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.9rem;
}

/* Dark mode overrides for elements with hardcoded colors */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) a:hover { color: #5ac8f5; }
  :root:not([data-theme="light"]) .ask-teacher { background: linear-gradient(135deg, rgba(48,209,88,0.08), rgba(48,209,88,0.04)); border-color: rgba(48,209,88,0.3); }
  :root:not([data-theme="light"]) .quiz-options button.correct { background: rgba(48, 209, 88, 0.15); border-color: var(--color-success); color: #30d158; }
  :root:not([data-theme="light"]) .quiz-options button.incorrect { background: rgba(255, 69, 58, 0.15); border-color: var(--color-danger); color: #ff453a; }
  :root:not([data-theme="light"]) .quiz-feedback.correct { background: rgba(48, 209, 88, 0.15); color: #30d158; }
  :root:not([data-theme="light"]) .quiz-feedback.incorrect { background: rgba(255, 69, 58, 0.15); color: #ff453a; }
  :root:not([data-theme="light"]) .primary-source { box-shadow: 0 2px 8px rgba(100, 210, 255, 0.08); }
}

[data-theme="dark"] a:hover { color: #5ac8f5; }
[data-theme="dark"] .ask-teacher { background: linear-gradient(135deg, rgba(48,209,88,0.08), rgba(48,209,88,0.04)); border-color: rgba(48,209,88,0.3); }
[data-theme="dark"] .quiz-options button.correct { background: rgba(48, 209, 88, 0.15); border-color: var(--color-success); color: #30d158; }
[data-theme="dark"] .quiz-options button.incorrect { background: rgba(255, 69, 58, 0.15); border-color: var(--color-danger); color: #ff453a; }
[data-theme="dark"] .quiz-feedback.correct { background: rgba(48, 209, 88, 0.15); color: #30d158; }
[data-theme="dark"] .quiz-feedback.incorrect { background: rgba(255, 69, 58, 0.15); color: #ff453a; }
[data-theme="dark"] .primary-source { box-shadow: 0 2px 8px rgba(100, 210, 255, 0.08); }

@media print {
  body {
    max-width: 100%;
    padding: 1rem;
    font-size: 10pt;
  }

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

  .quiz-options button,
  .quiz-options li {
    cursor: default;
  }

  .ask-teacher,
  .callout,
  .quiz {
    border: 1px solid #ccc;
    box-shadow: none;
  }

  pre {
    border: 1px solid #ccc;
  }
}

@media (max-width: 600px) {
  html {
    font-size: 16px;
  }

  body {
    padding: 2rem 1.25rem 3rem;
  }

  h1 {
    font-size: 1.8rem;
  }

  h2 {
    font-size: 1.3rem;
  }

  .diagram {
    font-size: 0.68rem;
  }

  .lesson-nav {
    font-size: 0.82rem;
  }

  .lesson-card {
    grid-template-columns: 2rem 1fr;
  }

  .lesson-time {
    display: none;
  }

  .course-header h1 {
    font-size: 2rem;
  }
}