/* ============================================================
   COLUMN PAGE STYLES
   ============================================================ */

/* --- Column Hero --- */
.column-hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  padding: calc(var(--header-height) + 60px) 0 64px;
}

.column-hero-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px;
}

.column-breadcrumb {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 24px;
}

.column-breadcrumb a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.column-breadcrumb a:hover {
  color: #FFFFFF;
}

.column-hero-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 36px;
  line-height: 1.5;
  color: #FFFFFF;
  margin-bottom: 20px;
}

.column-hero-meta {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.column-hero-author {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* --- Column Body --- */
.column-body {
  max-width: 800px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}

/* Lead paragraph */
.column-lead {
  font-size: 17px;
  line-height: 2;
  color: var(--color-text);
  margin-bottom: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--color-border);
}

.column-lead strong {
  color: var(--color-primary);
  font-weight: 700;
}

/* Table of Contents */
.column-toc {
  background: var(--color-bg-gray);
  padding: 32px 36px;
  margin-bottom: 56px;
}

.column-toc-title {
  font-weight: 700;
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.column-toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: toc;
}

.column-toc-list li {
  counter-increment: toc;
  margin-bottom: 8px;
}

.column-toc-list li:last-child {
  margin-bottom: 0;
}

.column-toc-list a {
  font-size: 15px;
  color: var(--color-text);
  text-decoration: none;
  display: flex;
  align-items: baseline;
  gap: 8px;
  line-height: 1.6;
  transition: color 0.15s ease;
}

.column-toc-list a::before {
  content: counter(toc) ".";
  color: var(--color-primary);
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
  min-width: 20px;
}

.column-toc-list a:hover {
  color: var(--color-primary);
}

/* Heading H2 */
.column-body h2 {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 28px;
  line-height: 1.4;
  color: var(--color-primary);
  margin: 64px 0 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
}

.column-body h2:first-of-type {
  margin-top: 0;
}

/* Heading H3 */
.column-body h3 {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 21px;
  line-height: 1.4;
  color: var(--color-text);
  margin: 40px 0 16px;
  padding-left: 14px;
  border-left: 3px solid var(--color-primary);
}

/* Paragraphs */
.column-body p {
  font-size: 16px;
  line-height: 2;
  color: var(--color-text);
  margin-bottom: 24px;
}

/* Blockquote */
.column-body blockquote {
  margin: 32px 0;
  padding: 24px 28px;
  background: rgba(0, 71, 142, 0.04);
  border-left: 4px solid var(--color-primary);
  font-size: 16px;
  line-height: 1.9;
  color: var(--color-text);
}

.column-body blockquote strong {
  color: var(--color-primary);
}

/* Unordered lists */
.column-body ul {
  margin: 16px 0 24px;
  padding-left: 0;
  list-style: none;
}

.column-body ul li {
  font-size: 16px;
  line-height: 1.9;
  color: var(--color-text);
  padding-left: 20px;
  position: relative;
  margin-bottom: 8px;
}

.column-body ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 2px;
  background: var(--color-accent);
}

/* Strong emphasis */
.column-body strong {
  font-weight: 700;
}

/* --- Illustration blocks --- */
.column-illust {
  text-align: center;
  margin: 40px 0;
  padding: 32px 24px;
  background: var(--color-bg-gray);
}

.column-illust svg {
  max-width: 100%;
  height: auto;
}

.column-illust-caption {
  font-size: 13px;
  color: var(--color-text-light);
  margin-top: 12px;
}

/* --- Key Point Box --- */
.column-keypoint {
  background: rgba(235, 140, 0, 0.08);
  border: 1px solid rgba(235, 140, 0, 0.25);
  padding: 24px 28px;
  margin: 32px 0;
}

.column-keypoint-title {
  font-weight: 700;
  font-size: 15px;
  color: var(--color-accent-dark);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.column-keypoint p {
  margin-bottom: 0;
}

/* --- Step Section --- */
.column-step {
  margin: 32px 0;
  padding: 28px 32px;
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  position: relative;
}

.column-step-number {
  position: absolute;
  top: -14px;
  left: 24px;
  background: var(--color-primary);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 13px;
  padding: 4px 14px;
  letter-spacing: 1px;
}

/* --- Failure Pattern Box --- */
.column-fail {
  margin: 32px 0;
  padding: 28px 32px;
  background: #FDF6F6;
}

.column-fail h3 {
  color: #96281B;
  border-left: none;
  padding-left: 0;
  margin-top: 0;
}

/* --- Case Study Box --- */
.column-case {
  margin: 32px 0;
  padding: 28px 32px;
  background: var(--color-bg-gray);
}

.column-case h3 {
  border-left: none;
  padding-left: 0;
  margin-top: 0;
  color: var(--color-primary);
}

/* --- FAQ Section --- */
.column-faq {
  margin: 32px 0;
}

.column-faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 24px 0;
}

.column-faq-item:first-child {
  border-top: 1px solid var(--color-border);
}

.column-faq-q {
  font-weight: 700;
  font-size: 17px;
  color: var(--color-text);
  margin-bottom: 12px;
  display: flex;
  gap: 10px;
}

.column-faq-q::before {
  content: 'Q';
  color: var(--color-primary);
  font-weight: 700;
  flex-shrink: 0;
}

.column-faq-a {
  font-size: 16px;
  line-height: 2;
  color: var(--color-text);
  padding-left: 26px;
}

/* --- Column CTA --- */
.column-cta {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  padding: 48px 36px;
  margin: 56px 0 0;
  text-align: center;
}

.column-cta-text {
  font-size: 17px;
  color: #FFFFFF;
  line-height: 1.9;
  margin-bottom: 28px;
}

.column-body .column-cta p {
  color: #FFFFFF;
}

.column-cta .btn-primary {
  font-size: 17px;
  padding: 16px 48px;
}

/* --- Back link --- */
.column-back {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

/* --- Structured Data invisible --- */
.column-body .sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ============================================================
   RESPONSIVE (max-width: 768px)
   ============================================================ */
@media (max-width: 768px) {
  .column-hero {
    padding: calc(var(--header-height) + 32px) 0 40px;
  }

  .column-hero-title {
    font-size: 26px;
  }

  .column-body {
    padding: 40px 20px 60px;
  }

  .column-lead {
    font-size: 15px;
    margin-bottom: 36px;
    padding-bottom: 36px;
  }

  .column-toc {
    padding: 24px 20px;
    margin-bottom: 40px;
  }

  .column-body h2 {
    font-size: 23px;
    margin: 48px 0 20px;
  }

  .column-body h3 {
    font-size: 18px;
    margin: 32px 0 12px;
  }

  .column-body p {
    font-size: 15px;
  }

  .column-body blockquote {
    padding: 20px;
  }

  .column-step {
    padding: 24px 20px;
  }

  .column-fail {
    padding: 24px 20px;
  }

  .column-case {
    padding: 24px 20px;
  }

  .column-cta {
    padding: 36px 24px;
    margin: 40px 0 0;
  }

  .column-cta-text {
    font-size: 15px;
  }

  .column-illust {
    padding: 24px 16px;
    margin: 32px 0;
  }
}