/* ============================================
   Design Patterns — Case Page Styles
   ============================================ */

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

:root {
  --bg: #FDFCFB;
  --bg-tint: #F7F5F3;
  --bg-dark: #0d1117;
  --text: #1A1A1A;
  --text-muted: #7A7A7A;
  --text-light: #AFAFAF;
  --accent: #DC6B19;
  --accent-dark: #B45309;
  --border: #E8E4E0;
  --white: #FFFFFF;
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* Navigation (shared from main site) */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(253,252,251,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1100px; margin: 0 auto;
  padding: 0 2.5rem; height: 60px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { font-family: var(--font-mono); font-size: 1rem; letter-spacing: .05em; color: var(--text); }
.nav-links { display: flex; gap: 2.5rem; }
.nav-links a { font-size: .85rem; color: var(--text-muted); letter-spacing: .04em; transition: color .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }

/* Case Header */
.case-header {
  padding: 5rem 0 3rem;
}
.case-header-inner {
  max-width: 1100px; margin: 0 auto; padding: 0 2.5rem;
}
.case-breadcrumb {
  font-family: var(--font-mono); font-size: .72rem;
  color: var(--text-light); letter-spacing: .06em;
  margin-bottom: 1.5rem; display: flex; gap: .5rem; align-items: center;
}
.case-breadcrumb a { color: var(--text-muted); transition: color .2s; }
.case-breadcrumb a:hover { color: var(--accent); }
.case-tags { display: flex; gap: .4rem; margin-bottom: 1rem; }
.case-title {
  font-family: var(--font-serif); font-size: clamp(2.2rem,4vw,3.5rem);
  font-weight: 700; line-height: 1.15; margin-bottom: .8rem;
  letter-spacing: -.01em;
}
.case-title em { color: var(--accent); font-style: italic; }
.case-desc { font-size: 1rem; color: var(--text-muted); max-width: 560px; }
.ppt-download {
  display: inline-flex; align-items: center; gap: .5rem;
  margin-top: 1.5rem;
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .08em;
  padding: .5rem 1.2rem; border: 1px solid var(--border); color: var(--text-muted);
  transition: border-color .2s, color .2s;
}
.ppt-download:hover { border-color: var(--accent); color: var(--accent); }

/* Section */
.section { padding: 4rem 0; }
.section-inner { max-width: 1100px; margin: 0 auto; padding: 0 2.5rem; }
.section-tinted { background: var(--bg-tint); }
.section-dark { background: var(--bg-dark); color: var(--white); }

.label {
  font-family: var(--font-mono); font-size: .7rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--text-muted); margin-bottom: 1.5rem;
}
.label-light { color: rgba(255,255,255,0.5); }
.section-title {
  font-family: var(--font-serif); font-size: clamp(2rem,3.5vw,2.8rem);
  margin-bottom: 1.5rem; font-weight: 700; line-height: 1.2;
}
.title-light { color: var(--white); }
.section-subtitle { font-size: .9rem; color: var(--text-muted); margin-bottom: 2rem; }

/* Pattern Grid */
.pattern-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin-top: 0;
}
.pattern-card {
  display: block;
  border: 1px solid var(--border);
  background: var(--white);
  transition: border-color .2s, transform .15s, box-shadow .15s;
  cursor: pointer;
}
.pattern-card:hover {
  border-color: var(--card-color, var(--accent));
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(0,0,0,0.08);
}
.pattern-card-inner { padding: 1.5rem; }
.pattern-card-num {
  font-family: var(--font-mono); font-size: .7rem;
  color: var(--card-color, var(--accent)); letter-spacing: .1em;
  margin-bottom: .6rem;
}
.pattern-card-body { margin-bottom: 1rem; }
.pattern-card-name-en {
  font-family: var(--font-serif); font-size: 1.05rem;
  font-weight: 700; margin-bottom: .15rem;
}
.pattern-card-name-cn {
  font-size: .82rem; color: var(--text-muted); margin-bottom: .5rem;
}
.pattern-card-desc { font-size: .82rem; color: var(--text-muted); line-height: 1.5; }
.pattern-card-cat {
  display: inline-block;
  font-family: var(--font-mono); font-size: .62rem;
  letter-spacing: .08em; text-transform: uppercase;
  padding: .2rem .5rem; border: 1px solid var(--card-color, var(--border));
  color: var(--card-color, var(--text-muted));
  background: rgba(0,0,0,0.02);
}

/* Timeline */
.timeline { display: flex; flex-direction: column; gap: 0; }
.timeline-item {
  display: grid; grid-template-columns: 80px 1fr; gap: 2rem;
  padding: 1.8rem 0; border-bottom: 1px solid var(--border);
  align-items: start;
}
.timeline-item:last-child { border-bottom: none; }
.timeline-year {
  font-family: var(--font-mono); font-size: .8rem; color: var(--accent);
  letter-spacing: .08em; padding-top: .2rem;
}
.timeline-content h3 { font-size: 1rem; font-family: var(--font-serif); margin-bottom: .4rem; }
.timeline-content p { font-size: .88rem; color: var(--text-muted); line-height: 1.7; }

/* Quote block */
.quote-block {
  font-family: var(--font-serif); font-size: 1.05rem; font-style: italic;
  border-left: 3px solid var(--accent); padding-left: 1.5rem;
  margin-top: 1rem; color: var(--text-muted); line-height: 1.8;
}

/* Case Layout */
.case-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
  margin-top: 0;
}
.case-demo {
  background: var(--bg-dark);
  border: 1px solid #2E2E2E;
  border-radius: 2px;
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
}
.case-demo canvas {
  display: block;
  width: 100%;
  height: auto;
}
.demo-canvas-wrap {
  position: relative;
  flex-shrink: 0;
  min-height: 220px;
}
.demo-log-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
}
.case-demo canvas { display: block; width: 100%; height: auto; }
.demo-controls {
  position: absolute; top: .75rem; right: .75rem;
  display: flex; gap: .4rem; flex-wrap: wrap;
}
.demo-btn {
  font-family: var(--font-mono); font-size: .65rem; letter-spacing: .08em;
  padding: .3rem .7rem; background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15); color: rgba(255,255,255,0.7);
  cursor: pointer; transition: background .15s, color .15s;
}
.demo-btn:hover { background: rgba(255,255,255,0.15); color: white; }
.demo-btn.active { background: var(--accent); border-color: var(--accent); color: white; }
.demo-log {
  left: 0; right: 0;
  text-align: center;
  font-family: var(--font-mono); font-size: .65rem;
  color: rgba(255,255,255,0.4); max-height: 60px; overflow: hidden;
  pointer-events: none;
}

/* Code Panel */
.code-panel {
  user-select: none;
  -webkit-user-select: none;
  cursor: default;
}
.code-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}
.code-tab {
  flex: 0 0 auto;
  font-family: var(--font-mono); font-size: .68rem; letter-spacing: .06em;
  padding: .5rem 1rem; cursor: pointer; color: var(--text-muted);
  background: transparent; border: 0;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
  transition: color .15s, border-color .15s;
}
.code-tab:hover { color: var(--text); }
.code-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.code-area { display: none; }
.code-area.active { display: block; }
.code-block,
.code-pre {
  background: var(--bg-dark); padding: 1.25rem 1.5rem;
  overflow-x: auto; max-height: 420px; overflow-y: auto;
  font-family: var(--font-mono); font-size: .72rem;
  line-height: 1.65; color: #D4D4D4;
  border: 1px solid #2E2E2E; border-top: none;
}
.code-pre code { display: block; }
.code-block .kw,  .code-pre .kw  { color: #569CD6; }
.code-block .cl,  .code-pre .cl  { color: #4EC9B0; }
.code-block .fn,  .code-pre .fn  { color: #DCDCAA; }
.code-block .str, .code-pre .str { color: #CE9178; }
.code-block .cm,  .code-pre .cm  { color: #6A9955; }
.code-block .num, .code-pre .num { color: #B5CEA8; }

/* UML Diagram */
.uml-panel { margin-bottom: 2rem; }
.uml-panel h3 {
  font-family: var(--font-mono); font-size: .7rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--text-muted); margin-bottom: 1rem;
}
.uml-svg-wrap { background: var(--white); border: 1px solid var(--border); padding: 1.5rem; }

/* Two col text */
.two-col { display: grid; grid-template-columns: 1fr 2fr; gap: 4rem; align-items: start; }
.two-col p { font-size: .95rem; line-height: 1.85; color: var(--text-muted); margin-bottom: .8rem; }
.two-col p strong { color: var(--text); }

/* Outcomes grid (shared) */
.outcomes-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 1rem; margin-top: 0; }
.outcome { padding: 1.8rem; border: 1px solid var(--border); background: var(--white); }
.outcome-icon { font-size: 1.2rem; color: var(--accent); margin-bottom: .8rem; display: block; }
.outcome h3 { font-size: 1rem; font-family: var(--font-serif); margin-bottom: .5rem; font-weight: 700; }
.outcome p { font-size: .88rem; color: var(--text-muted); line-height: 1.65; }

/* Footer */
.footer { padding: 3.5rem 0; border-top: 1px solid var(--border); }
.footer-inner { max-width: 1100px; margin: 0 auto; padding: 0 2.5rem; text-align: center; }
.footer-title { font-family: var(--font-serif); font-size: 1.05rem; margin-bottom: .3rem; }
.footer-sub { font-size: .8rem; color: var(--text-light); margin-bottom: 1.2rem; }
.footer-copy { font-family: var(--font-mono); font-size: .68rem; color: var(--text-light); letter-spacing: .06em; }

/* Tag */
.tag {
  display: inline-block; font-family: var(--font-mono); font-size: .65rem;
  letter-spacing: .08em; text-transform: uppercase;
  padding: .2rem .55rem; border: 1px solid var(--border); color: var(--text-muted);
}

/* Section subtitle */
.section-subtitle { font-size: .9rem; color: var(--text-muted); margin-bottom: 2rem; }

/* Responsive */
@media (max-width: 900px) {
  .case-layout { grid-template-columns: 1fr; }
  .two-col { grid-template-columns: 1fr; gap: 2rem; }
  .outcomes-grid { grid-template-columns: 1fr; }
  .pattern-grid { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 600px) {
  .section { padding: 3rem 0; }
  .section-inner, .case-header-inner { padding: 0 1.25rem; }
  .nav-inner {
    height: auto; min-height: 60px; padding: .65rem 1rem;
    flex-direction: column; justify-content: center; gap: .45rem;
  }
  .nav-links {
    width: 100%; justify-content: center; flex-wrap: wrap;
    gap: .25rem clamp(.7rem, 4vw, 1.25rem);
  }
  .nav-links a { font-size: .75rem; white-space: nowrap; }
  .section-label-row { flex-wrap: wrap; }
  .section-label-row .section-hint { width: 100%; margin-left: 0; white-space: normal; }
  .pattern-grid { grid-template-columns: 1fr; }
}
/* ── Objectives ── */
.objectives-section { padding: 4rem 0; }
.objectives-inner    { max-width: 1100px; margin: 0 auto; padding: 0 2.5rem; }
.section-label-row   { display: flex; align-items: center; gap: 1rem; margin-bottom: 2.5rem; }
.section-label       { font-family: var(--font-mono); font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); white-space: nowrap; }
.section-line        { min-width: 2rem; height: 1px; background: var(--border); }
.section-label-row .section-line {
  flex: 1 1 auto;
  min-width: 4rem;
}
.objectives-grid     { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px,1fr)); gap: 1rem; }
.objective-item      { display: flex; gap: 1.2rem; align-items: flex-start; padding: 1.4rem; border: 1px solid var(--border); background: var(--white); }
.objective-num       { font-family: var(--font-mono); font-size: .7rem; color: var(--accent); letter-spacing: .08em; min-width: 28px; padding-top: .15rem; }
.objective-item p    { font-size: .88rem; color: var(--text-muted); line-height: 1.65; margin: 0; }

/* ── Concepts Strip ── */
.concepts-strip      { background: var(--bg-tint); padding: 2.5rem 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.concepts-strip-inner{ max-width: 1100px; margin: 0 auto; padding: 0 2.5rem; display: flex; align-items: center; flex-wrap: wrap; gap: 1.2rem; }
.concepts-label      { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--text-muted); white-space: nowrap; }
.concepts-tags       { display: flex; flex-wrap: wrap; gap: .5rem; }
.concept-tag         { font-family: var(--font-mono); font-size: .7rem; letter-spacing: .05em; padding: .28rem .75rem; background: var(--white); border: 1px solid var(--border); color: var(--text-muted); }

/* ── Slides ── */
.slides-section      { padding: 4rem 0; }
.slides-section-inner{ max-width: 1100px; margin: 0 auto; padding: 0 2.5rem; }
.section-hint        { font-size: .7rem; color: var(--text-light); letter-spacing: .06em; margin-left: auto; white-space: nowrap; }
.slide-grid          { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 1rem; margin-top: 0; }
.slide-item          { display: block; width: 100%; padding: 0; background: transparent; border: 0; color: inherit; cursor: pointer; }
.slide-item img      { width: 100%; aspect-ratio: 16/9; object-fit: cover; border: 1px solid var(--border); transition: box-shadow .2s, transform .15s; }
.slide-item:hover img{ box-shadow: 0 6px 24px rgba(0,0,0,.1); transform: translateY(-2px); }
.slide-caption       { font-family: var(--font-mono); font-size: .65rem; color: var(--text-light); letter-spacing: .06em; margin-top: .5rem; text-align: center; }

/* ── Lesson Footer ── */
.lesson-footer       { padding: 2.5rem 0; }
.lesson-footer-inner{ max-width: 1100px; margin: 0 auto; padding: 0 2.5rem; display: flex; align-items: center; justify-content: center; gap: 2rem; }
.lesson-footer-inner a{ font-family: var(--font-mono); font-size: .75rem; letter-spacing: .06em; color: var(--text-muted); padding: .5rem 1rem; border: 1px solid var(--border); transition: border-color .2s,color .2s; }
.lesson-footer-inner a:hover{ border-color: var(--accent); color: var(--accent); }

/* ── Lightbox ── */
.lightbox            { display: none; position: fixed; inset: 0; z-index: 9999; background: rgba(0,0,0,.92); align-items: center; justify-content: center; }
.lightbox.active     { display: flex; }
.lightbox-img        { max-width: 92vw; max-height: 88vh; object-fit: contain; }
.lightbox-close      { position: absolute; top: 1.5rem; right: 2rem; background: none; border: none; color: rgba(255,255,255,.7); font-size: 2rem; cursor: pointer; }
.lightbox-nav        { position: absolute; top: 50%; transform: translateY(-50%); background: rgba(255,255,255,.1); border: none; color: white; font-size: 3rem; cursor: pointer; padding: .5rem 1rem; transition: background .2s; }
.lightbox-nav:hover  { background: rgba(255,255,255,.2); }
.lightbox-prev       { left: 1rem; }
.lightbox-next       { right: 1rem; }
.lightbox-counter    { position: absolute; bottom: 1.5rem; left: 50%; transform: translateX(-50%); color: rgba(255,255,255,.6); font-family: var(--font-mono); font-size: .75rem; letter-spacing: .1em; }

dialog.lightbox      { width: auto; height: auto; max-width: none; max-height: none; margin: 0; padding: 0; border: 0; color: inherit; }
.code-tab:focus-visible,
.slide-item:focus-visible,
.lightbox button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}
.slide-item:focus-visible img { box-shadow: 0 0 0 3px rgba(220,107,25,.25); }

/* UML Class Diagram Section */
.uml-section {
  padding: 4rem 0;
}
.uml-section .section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2.5rem;
}
.uml-label-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
}
.uml-label-row .section-label {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-muted);
  white-space: nowrap;
}
.uml-label-row .section-line {
  flex: 1;
  height: 1px;
  background: var(--border);
}
.uml-svg-wrap {
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 10px;
  padding: 2rem;
  max-width: 900px;
  margin: 0 auto 1.5rem;
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
  overflow-x: auto;
}
.uml-svg-wrap svg,
.uml-svg-wrap .mermaid svg {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
}
.uml-caption {
  text-align: center;
  font-size: .82rem;
  color: var(--text-muted);
  font-style: italic;
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ── Case Demo ── */
.case-section {
  padding: 4rem 0;
}
.case-section .section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2.5rem;
}
.case-label-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
}
.case-label-row .section-label {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-muted);
  white-space: nowrap;
}
.case-label-row .section-line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── Outcomes / Key Points ── */
.outcomes-section {
  padding: 4rem 0;
}
.outcomes-section .section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2.5rem;
}
.outcomes-label-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
}
.outcomes-label-row .section-label {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-muted);
  white-space: nowrap;
}
.outcomes-label-row .section-line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* cms-mobile-390-v1 */
@media (max-width: 420px) {
  .nav-inner {
    height: auto;
    min-height: 60px;
    padding: .8rem 1rem;
    flex-wrap: wrap;
    gap: .65rem 1rem;
  }
  .nav-links {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .45rem .8rem;
  }
  .nav-links a { white-space: normal; overflow-wrap: anywhere; line-height: 1.4; }
  .lesson-footer-inner { flex-wrap: wrap; gap: .8rem; }
  .lesson-footer-inner > * { min-width: 0; overflow-wrap: anywhere; }
  .pattern-grid, .slide-grid, .objectives-grid, .outcomes-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* cms-outcome-title-row-v1 */
.outcome > .outcome-icon {
  display: inline-block;
  margin: 0 .55rem 0 0;
  vertical-align: middle;
}
.outcome > .outcome-icon + h3 {
  display: inline;
  margin-bottom: 0;
  vertical-align: middle;
}
.outcome > .outcome-icon + h3 + p { margin-top: .6rem; }

/* cms-bilingual-case-title-v1 */
@media (max-width: 700px) {
  .case-title-translation {
    display: block;
    white-space: nowrap;
  }
}