/* ==============================
   Case Study Cards - Styles
   ============================== */

/* Header */
.cs-header {
  text-align: center;
  margin-bottom: var(--space-xl);
  position: relative;
}

.cs-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.cs-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  font-weight: 500;
  margin-bottom: var(--space-md);
}

.cs-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: 480px;
  margin: 0 auto;
}

/* Expand button */
.cs-expand-btn {
  position: absolute;
  top: 0;
  right: 0;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-sm);
  cursor: pointer;
  color: var(--color-text-muted);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.cs-expand-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Expanded mode */
body.cs-expanded .container {
  max-width: 960px;
}

body.cs-expanded .cs-card-title {
  font-size: var(--font-size-xl);
}

body.cs-expanded .cs-card-summary,
body.cs-expanded .cs-card-issue-text,
body.cs-expanded .cs-card-questions-list li {
  font-size: var(--font-size-base);
}

body.cs-expanded .cs-card {
  padding: var(--space-xl);
}

body.cs-expanded .cs-card-questions-list li {
  padding-left: calc(var(--space-lg) + var(--space-sm));
  margin-bottom: var(--space-lg);
}

body.cs-expanded .cs-card-questions-list li::before {
  width: 24px;
  height: 24px;
  font-size: 13px;
}

/* How to use */
.cs-howto {
  text-align: left;
  margin-top: var(--space-md);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.cs-howto-toggle {
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  cursor: pointer;
  font-weight: 500;
  list-style: none;
  text-align: center;
  display: block;
}

.cs-howto-toggle::-webkit-details-marker {
  display: none;
}

.cs-howto-toggle::before {
  content: "+ ";
  font-weight: 700;
}

.cs-howto[open] .cs-howto-toggle::before {
  content: "- ";
}

.cs-howto-body {
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.cs-howto-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  padding: var(--space-md);
}

.cs-howto-item h3 {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.cs-howto-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.cs-howto-blog {
  text-align: center;
  margin-top: var(--space-sm);
}

.cs-howto-blog a {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  text-decoration: underline;
}

.cs-howto-blog a:hover {
  color: var(--color-primary-hover);
}

/* Progress */
.cs-progress {
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  font-weight: 500;
  margin-top: var(--space-md);
  min-height: 1.5em;
}

/* Mode Switch */
.cs-mode-switch {
  display: flex;
  gap: 2px;
  background-color: var(--color-border-light);
  border-radius: var(--radius);
  padding: 2px;
  margin-bottom: var(--space-xl);
}

.cs-mode-btn {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border: none;
  border-radius: calc(var(--radius) - 2px);
  cursor: pointer;
  background-color: transparent;
  color: var(--color-text-secondary);
  transition: var(--transition);
}

.cs-mode-btn.active {
  background-color: var(--color-surface);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.cs-mode-btn:hover:not(.active) {
  color: var(--color-text);
}

/* Section */
.cs-section {
  margin-bottom: var(--space-xl);
}

/* ==============================
   Card (shared between draw & list)
   ============================== */

.cs-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border-light);
  transition: var(--transition);
}

.cs-card-chapter {
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--space-xs);
  margin-bottom: var(--space-md);
}

.cs-card-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.5;
  margin-bottom: var(--space-md);
}

.cs-card-summary {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.cs-card-issue {
  background-color: var(--color-warning-light);
  border-left: 3px solid var(--color-warning);
  border-radius: var(--radius);
  padding: var(--space-md);
  margin-bottom: var(--space-lg);
}

.cs-card-issue-label {
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-warning);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.cs-card-issue-text {
  font-size: var(--font-size-sm);
  color: var(--color-text);
  line-height: 1.8;
}

.cs-card-questions {
  margin-bottom: var(--space-lg);
}

.cs-card-questions-label {
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.cs-card-questions-list {
  list-style: none;
  counter-reset: question;
}

.cs-card-questions-list li {
  counter-increment: question;
  position: relative;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
  font-size: var(--font-size-sm);
  line-height: 1.8;
  color: var(--color-text);
}

.cs-card-questions-list li:last-child {
  margin-bottom: 0;
}

.cs-card-questions-list li::before {
  content: counter(question);
  position: absolute;
  left: 0;
  top: 2px;
  width: 20px;
  height: 20px;
  background-color: var(--color-primary);
  color: #ffffff;
  border-radius: 50%;
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cs-card-principles {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.cs-card-principle-tag {
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--space-xs);
}

/* Done toggle button (draw mode) */
.cs-card-done-area {
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
}

.cs-done-btn {
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
}

.cs-done-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.cs-done-btn-active {
  background-color: var(--color-accent-light);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* Done checkbox (list mode) */
.cs-card-header-left {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.cs-done-check {
  flex-shrink: 0;
  background: none;
  border: none;
  font-size: var(--font-size-lg);
  cursor: pointer;
  padding: 0;
  line-height: 1;
  margin-top: 2px;
}

.cs-card-done {
  opacity: 0.7;
}

.cs-card-done .cs-card-title {
  color: var(--color-text-secondary);
}

/* Reset area */
.cs-reset-area {
  text-align: center;
  margin-bottom: var(--space-lg);
}

/* ==============================
   Draw Mode
   ============================== */

.cs-draw-area {
  margin-bottom: var(--space-lg);
}

#drawn-card {
  display: none;
}

#drawn-card.visible {
  display: block;
  animation: cardDraw 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes cardDraw {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.cs-draw-actions {
  text-align: center;
}

.cs-draw-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-sm);
}

/* ==============================
   List Mode
   ============================== */

/* Filter select */
.cs-filter-select {
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: var(--transition);
  appearance: auto;
}

.cs-filter-select:hover {
  border-color: var(--color-primary);
}

.cs-filter-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* Print button */
.cs-print-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
  font-family: var(--font-family);
  font-size: var(--font-size-xs);
  font-weight: 500;
}

.cs-print-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

/* Card list */
.cs-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.cs-list .cs-card {
  cursor: default;
}

/* Collapsible cards in list mode */
.cs-list .cs-card-body {
  display: none;
}

.cs-list .cs-card.expanded .cs-card-body {
  display: block;
  animation: fadeIn 0.3s ease-out;
}

.cs-list .cs-card-header {
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-md);
}

.cs-card-toggle {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
  transition: transform 0.2s ease;
  margin-top: 2px;
}

.cs-card.expanded .cs-card-toggle {
  transform: rotate(180deg);
}

/* ==============================
   Footer
   ============================== */

.cs-footer {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.cs-footer-book {
  text-align: center;
  padding: var(--space-xl);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
}

.cs-footer-book p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

.cs-footer-book-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
}

.cs-footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.cs-footer-links a {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  text-decoration: underline;
}

.cs-footer-links a:hover {
  color: var(--color-primary-hover);
}

/* ==============================
   List header (filter + print)
   ============================== */

.cs-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

/* ==============================
   Print Styles
   ============================== */

@media print {
  /* Hide everything except card list */
  .cs-header,
  .cs-mode-switch,
  #draw-mode,
  .cs-list-header,
  .cs-reset-area,
  .cs-footer,
  .cs-expand-btn,
  .site-footer,
  .screen-top-nav,
  .cs-done-check,
  .cs-card-toggle,
  .cs-card-done-area,
  .cs-progress {
    display: none !important;
  }

  body {
    background: #ffffff;
  }

  .container {
    max-width: 100%;
    padding: 0 10mm;
  }

  /* Show list mode */
  #list-mode {
    display: block !important;
  }

  /* Expand all cards and show bodies */
  .cs-list .cs-card-body {
    display: block !important;
  }

  /* Card print layout */
  .cs-card {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
    page-break-inside: avoid;
    margin-bottom: 8mm;
  }

  .cs-card-done {
    opacity: 1;
  }

  .cs-card-done .cs-card-title {
    color: var(--color-primary);
  }

  /* Header styling for print - no need for click affordance */
  .cs-card-header {
    cursor: default;
  }
}

/* ==============================
   Responsive
   ============================== */

@media (max-width: 480px) {
  .cs-title {
    font-size: var(--font-size-xl);
  }

  .cs-card {
    padding: var(--space-md);
  }

  .cs-card-title {
    font-size: var(--font-size-base);
  }

  .cs-filter {
    gap: var(--space-xs);
  }

  .cs-footer-links {
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
  }
}