/* ==========================================================================
   column.css - らねこシステム / EC発送ノウハウ・コラム専用スタイル
   ========================================================================== */

:root {
    --col-bg: #ffffff;
    --col-bg-sub: #f8fafc;
    --col-bg-muted: #f1f5f9;
    --col-text: #1e293b;
    --col-title: #0f172a;
    --col-muted: #64748b;
    --col-border: #e2e8f0;
    --col-primary: #2563eb;
    --col-primary-hover: #1d4ed8;
    --col-primary-light: #eff6ff;
    --col-accent-amber: #d97706;
    --col-accent-amber-light: #fffbeb;
    --col-accent-green: #059669;
    --col-accent-green-light: #ecfdf5;
    --col-radius-sm: 6px;
    --col-radius-md: 10px;
    --col-radius-lg: 16px;
    --col-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --col-shadow-md: 0 4px 16px -2px rgba(15, 23, 42, 0.06);
    --col-shadow-hover: 0 12px 28px -4px rgba(15, 23, 42, 0.1);
}

/* Base Body */
body.column-page {
    font-family: 'Plus Jakarta Sans', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--col-text);
    background-color: var(--col-bg-sub);
    line-height: 1.95;
    -webkit-font-smoothing: antialiased;
    margin: 0;
    padding: 0;
}

/* Header */
.col-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--col-border);
    position: sticky;
    top: 0;
    z-index: 100;
}
.col-header-inner {
    max-width: 1140px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.col-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--col-title);
}
.col-brand-symbol {
    width: 34px;
    height: 34px;
    background: linear-gradient(135deg, #1d4ed8, #2563eb);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-weight: 800;
    font-size: 15px;
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.3);
}
.col-brand-title {
    font-size: 18px;
    font-weight: 800;
    letter-spacing: -0.01em;
}
.col-brand-badge {
    font-size: 11px;
    font-weight: 700;
    background: var(--col-bg-muted);
    color: var(--col-muted);
    padding: 3px 8px;
    border-radius: 4px;
    border: 1px solid var(--col-border);
}
.col-header-nav {
    display: flex;
    align-items: center;
    gap: 16px;
}
.col-header-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--col-muted);
    text-decoration: none;
    transition: color 0.15s ease;
}
.col-header-link:hover {
    color: var(--col-primary);
}
.col-header-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--col-primary);
    color: #ffffff;
    font-size: 13.5px;
    font-weight: 700;
    padding: 8px 16px;
    border-radius: var(--col-radius-sm);
    text-decoration: none;
    transition: all 0.15s ease;
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.25);
}
.col-header-btn:hover {
    background: var(--col-primary-hover);
    transform: translateY(-1px);
}

/* Breadcrumbs */
.col-breadcrumbs {
    max-width: 1140px;
    margin: 18px auto 0;
    padding: 0 24px;
    font-size: 12.5px;
    color: var(--col-muted);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.col-breadcrumbs a {
    color: var(--col-muted);
    text-decoration: none;
    transition: color 0.15s;
}
.col-breadcrumbs a:hover {
    color: var(--col-primary);
    text-decoration: underline;
}
.col-breadcrumbs-sep {
    color: #cbd5e1;
}

/* Main Layout Grid */
.col-container {
    max-width: 1140px;
    margin: 24px auto 80px;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 36px;
    align-items: start;
}
@media (max-width: 900px) {
    .col-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

/* Article Container */
.col-article-card {
    background: var(--col-bg);
    border: 1px solid var(--col-border);
    border-radius: var(--col-radius-lg);
    padding: 44px 48px;
    box-shadow: var(--col-shadow-md);
    box-sizing: border-box;
}
@media (max-width: 640px) {
    .col-article-card {
        padding: 24px 20px;
    }
}

/* Article Meta */
.col-meta-tag {
    display: inline-flex;
    align-items: center;
    background: var(--col-primary-light);
    color: var(--col-primary);
    border: 1px solid #bfdbfe;
    font-size: 13px;
    font-weight: 700;
    padding: 5px 14px;
    border-radius: 20px;
    letter-spacing: 0.03em;
    margin-bottom: 16px;
}
.col-article-title {
    font-size: clamp(28px, 3.6vw, 36px);
    font-weight: 900;
    color: var(--col-title);
    line-height: 1.38;
    letter-spacing: -0.02em;
    margin: 0 0 18px 0;
}
.col-article-info {
    display: flex;
    align-items: center;
    gap: 18px;
    font-size: 14px;
    color: var(--col-muted);
    padding-bottom: 24px;
    border-bottom: 1px solid var(--col-border);
    margin-bottom: 36px;
}

/* Lead Section */
.col-lead {
    font-size: 18.5px;
    line-height: 1.9;
    color: #0f172a;
    background: #f8fafc;
    border-left: 5px solid var(--col-primary);
    padding: 22px 26px;
    border-radius: 0 var(--col-radius-md) var(--col-radius-md) 0;
    margin-bottom: 40px;
}

/* Table of Contents (TOC) */
.col-toc {
    background: var(--col-bg-sub);
    border: 1.5px solid var(--col-border);
    border-radius: var(--col-radius-md);
    padding: 24px 28px;
    margin: 36px 0 48px;
}
.col-toc-title {
    font-size: 17px;
    font-weight: 800;
    color: var(--col-title);
    margin: 0 0 16px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}
.col-toc-list {
    margin: 0;
    padding-left: 22px;
    font-size: 15.5px;
    line-height: 1.85;
}
.col-toc-list li {
    margin-bottom: 8px;
}
.col-toc-list a {
    color: #1e293b;
    text-decoration: none;
    transition: color 0.15s;
    font-weight: 500;
}
.col-toc-list a:hover {
    color: var(--col-primary);
    text-decoration: underline;
}

/* Headings */
.col-content h2 {
    font-size: 26px;
    font-weight: 900;
    color: var(--col-title);
    padding: 14px 22px;
    background: linear-gradient(90deg, #f1f5f9 0%, #ffffff 100%);
    border-left: 6px solid var(--col-primary);
    border-radius: 0 6px 6px 0;
    margin: 54px 0 24px;
    line-height: 1.45;
    letter-spacing: -0.01em;
}
.col-content h3 {
    font-size: 21px;
    font-weight: 800;
    color: var(--col-title);
    margin: 40px 0 18px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e2e8f0;
    line-height: 1.45;
}
.col-content p {
    font-size: 17.5px;
    line-height: 1.95;
    margin: 0 0 24px 0;
    color: #1e293b;
}
.col-content ul, .col-content ol {
    margin: 0 0 28px 0;
    padding-left: 28px;
    font-size: 17px;
    line-height: 1.9;
    color: #1e293b;
}
.col-content li {
    margin-bottom: 10px;
}

/* Callout Boxes */
.col-box {
    border-radius: var(--col-radius-md);
    padding: 24px 28px;
    margin: 32px 0;
    font-size: 16px;
    line-height: 1.85;
}
.col-box-amber {
    background: var(--col-accent-amber-light);
    border: 1.5px solid #fde68a;
    color: #78350f;
}
.col-box-green {
    background: var(--col-accent-green-light);
    border: 1.5px solid #a7f3d0;
    color: #064e3b;
}
.col-box-title {
    font-weight: 800;
    font-size: 17.5px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Step Sequence Card */
.col-step-card {
    background: #f8fafc;
    border: 1.5px solid #e2e8f0;
    border-radius: var(--col-radius-md);
    padding: 24px 28px;
    margin: 24px 0;
    position: relative;
}
.col-step-card p {
    font-size: 16.5px;
    line-height: 1.85;
    margin: 0;
}
.col-step-num {
    display: inline-block;
    background: var(--col-primary);
    color: #ffffff;
    font-size: 13px;
    font-weight: 800;
    padding: 3px 12px;
    border-radius: 4px;
    margin-bottom: 12px;
}
.col-step-title {
    font-size: 19px;
    font-weight: 800;
    color: var(--col-title);
    margin: 0 0 12px 0;
}

/* Main CTA Box (Karikari) */
.col-cta-box {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    border: 2px solid #38bdf8;
    border-radius: var(--col-radius-lg);
    padding: 40px 36px;
    color: #ffffff;
    text-align: center;
    margin: 54px 0;
    box-shadow: 0 20px 40px -10px rgba(15, 23, 42, 0.4);
    position: relative;
    overflow: hidden;
}
.col-cta-badge {
    display: inline-block;
    background: rgba(56, 189, 248, 0.2);
    color: #38bdf8;
    border: 1px solid rgba(56, 189, 248, 0.4);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.05em;
    padding: 4px 16px;
    border-radius: 20px;
    margin-bottom: 16px;
}
.col-content .col-cta-box h3,
.col-cta-box .col-cta-title {
    font-size: clamp(22px, 3vw, 28px) !important;
    font-weight: 900 !important;
    line-height: 1.35 !important;
    margin: 0 0 14px 0 !important;
    padding-bottom: 0 !important;
    border-bottom: none !important;
    color: #ffffff !important;
}
.col-content .col-cta-box p,
.col-cta-box .col-cta-desc {
    font-size: 16px !important;
    color: #cbd5e1 !important;
    line-height: 1.75 !important;
    max-width: 680px;
    margin: 0 auto 28px !important;
}
.col-cta-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
    color: #ffffff !important;
    font-size: 17px;
    font-weight: 800;
    padding: 16px 36px;
    border-radius: 8px;
    text-decoration: none;
    box-shadow: 0 4px 14px rgba(2, 132, 199, 0.4);
    transition: all 0.2s ease;
}
.col-cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(2, 132, 199, 0.5);
    background: linear-gradient(135deg, #0369a1 0%, #075985 100%);
}
.col-content .col-cta-box .col-cta-subtext {
    font-size: 13px !important;
    color: #94a3b8 !important;
    margin: 16px auto 0 !important;
}

/* Secondary CTA (Raneko System Upsell) */
.col-upsell-box {
    background: #f0fdf4;
    border: 1.5px solid #86efac;
    border-radius: var(--col-radius-lg);
    padding: 32px 32px;
    margin: 44px 0;
}
.col-upsell-tag {
    font-size: 12px;
    font-weight: 800;
    color: #166534;
    background: #dcfce7;
    border: 1px solid #bbf7d0;
    padding: 4px 12px;
    border-radius: 4px;
    display: inline-block;
    margin-bottom: 12px;
}
.col-content .col-upsell-box h3,
.col-upsell-box .col-upsell-title {
    font-size: 20px !important;
    font-weight: 800 !important;
    color: #064e3b !important;
    margin: 0 0 10px 0 !important;
    padding-bottom: 0 !important;
    border-bottom: none !important;
}
.col-content .col-upsell-box p,
.col-upsell-box .col-upsell-desc {
    font-size: 15.5px !important;
    color: #166534 !important;
    line-height: 1.75 !important;
    margin: 0 0 20px 0 !important;
}
.col-upsell-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #16a34a;
    color: #ffffff;
    font-size: 15px;
    font-weight: 700;
    padding: 12px 26px;
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.15s;
    box-shadow: 0 2px 6px rgba(22, 163, 74, 0.25);
}
.col-upsell-btn:hover {
    background: #15803d;
    transform: translateY(-1px);
}

/* Sidebar */
.col-sidebar {
    display: flex;
    flex-direction: column;
    gap: 28px;
}
.col-side-card {
    background: var(--col-bg);
    border: 1px solid var(--col-border);
    border-radius: var(--col-radius-md);
    padding: 24px;
    box-shadow: var(--col-shadow-sm);
}
.col-side-title {
    font-size: 16px;
    font-weight: 800;
    color: var(--col-title);
    margin: 0 0 16px 0;
    padding-bottom: 10px;
    border-bottom: 2px solid #e2e8f0;
}
.col-side-banner {
    display: block;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    border: 1px solid #38bdf8;
    border-radius: var(--col-radius-md);
    padding: 20px 18px;
    color: #ffffff;
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s;
}
.col-side-banner:hover {
    transform: translateY(-2px);
    box-shadow: var(--col-shadow-hover);
}
.col-side-banner-tag {
    font-size: 10.5px;
    font-weight: 800;
    color: #38bdf8;
    background: rgba(56, 189, 248, 0.15);
    padding: 2px 8px;
    border-radius: 4px;
    display: inline-block;
    margin-bottom: 8px;
}
.col-side-banner-title {
    font-size: 15px;
    font-weight: 800;
    line-height: 1.4;
    margin-bottom: 8px;
    color: #ffffff;
}
.col-side-banner-desc {
    font-size: 13px;
    color: #94a3b8;
    line-height: 1.6;
    margin-bottom: 12px;
}
.col-side-banner-btn {
    font-size: 13px;
    font-weight: 700;
    color: #38bdf8;
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Article List Cards (for column index) */
.col-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
    margin-top: 24px;
}
.col-card {
    background: var(--col-bg);
    border: 1.5px solid var(--col-border);
    border-radius: var(--col-radius-md);
    padding: 26px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    text-decoration: none;
    color: var(--col-text);
    box-shadow: var(--col-shadow-sm);
    transition: all 0.2s ease;
}
.col-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--col-shadow-hover);
    border-color: #cbd5e1;
}
.col-card-tag {
    font-size: 12px;
    font-weight: 700;
    color: var(--col-primary);
    background: var(--col-primary-light);
    border: 1px solid #bfdbfe;
    padding: 3px 10px;
    border-radius: 4px;
    width: fit-content;
    margin-bottom: 14px;
}
.col-card-title {
    font-size: 19.5px;
    font-weight: 800;
    color: var(--col-title);
    line-height: 1.45;
    margin: 0 0 12px 0;
}
.col-card-excerpt {
    font-size: 15px;
    color: #475569;
    line-height: 1.75;
    margin: 0 0 18px 0;
}
.col-card-date {
    font-size: 13px;
    color: #94a3b8;
}

/* Footer */
.col-footer {
    background: #0b1329;
    color: #94a3b8;
    padding: 48px 24px;
    font-size: 13px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.col-footer-inner {
    max-width: 1140px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}
.col-footer-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}
.col-footer-links a {
    color: #94a3b8;
    text-decoration: none;
    transition: color 0.15s;
}
.col-footer-links a:hover {
    color: #ffffff;
}