/* ==========================================================================
   経費スッキリ (Keihi Sukkiri) — Blog Reader Styling
   ========================================================================== */

:root {
    --bg-base: #f8fafc;
    --bg-card: rgba(255, 255, 255, 0.9);
    --border-color: rgba(15, 23, 42, 0.08);
    --color-text-main: #0f172a;
    --color-text-sub: #475569;
    --color-text-light: #64748b;
    --primary-blue: #2563eb;
    --primary-blue-hover: #1d4ed8;
    --primary-blue-light: rgba(37, 99, 235, 0.06);
    --success-green: #10b981;
    --success-green-light: rgba(16, 185, 129, 0.06);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-premium: 0 10px 30px -5px rgba(15, 23, 42, 0.05);
}

body.dark-theme {
    --bg-base: #0b0f19;
    --bg-card: rgba(17, 24, 39, 0.9);
    --border-color: rgba(255, 255, 255, 0.08);
    --color-text-main: #f3f4f6;
    --color-text-sub: #9ca3af;
    --color-text-light: #6b7280;
    --primary-blue: #3b82f6;
    --primary-blue-hover: #60a5fa;
    --primary-blue-light: rgba(59, 130, 246, 0.12);
    --success-green: #34d399;
}

body {
    background-color: var(--bg-base);
    color: var(--color-text-main);
    font-family: 'Noto Sans JP', 'Inter', sans-serif;
    line-height: 1.8;
    margin: 0;
    padding: 0;
    transition: var(--transition-smooth);
}

/* Header & Nav */
.blog-header {
    border-bottom: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: var(--transition-smooth);
}

body.dark-theme .blog-header {
    background: rgba(11, 15, 25, 0.85);
}

.header-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.logo-link h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary-blue);
    margin: 0;
}

.logo-sub {
    font-size: 0.72rem;
    color: var(--color-text-light);
    font-weight: 500;
    letter-spacing: 0.05em;
}

/* Main Layout */
.blog-layout {
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--primary-blue);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 2rem;
    transition: var(--transition-smooth);
}

.btn-back:hover {
    transform: translateX(-4px);
}

/* Article Styles */
.article-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.82rem;
    color: var(--color-text-light);
    margin-bottom: 1rem;
    align-items: center;
}

.article-category {
    background: var(--primary-blue-light);
    color: var(--primary-blue);
    padding: 0.25rem 0.6rem;
    border-radius: 50px;
    font-weight: 700;
}

.article-title {
    font-size: 2.1rem;
    font-weight: 800;
    line-height: 1.4;
    margin-bottom: 2rem;
}

.article-body h2 {
    font-size: 1.45rem;
    font-weight: 800;
    border-left: 4px solid var(--primary-blue);
    padding-left: 0.8rem;
    margin-top: 3rem;
    margin-bottom: 1.2rem;
}

.article-body h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-top: 2rem;
    margin-bottom: 0.8rem;
}

.article-body p {
    color: var(--color-text-sub);
    margin-bottom: 1.5rem;
}

/* Step Guides */
.step-list {
    margin-bottom: 2rem;
    padding-left: 1.2rem;
}

.step-item {
    margin-bottom: 1.5rem;
    color: var(--color-text-sub);
}

.step-item strong {
    color: var(--color-text-main);
    display: block;
    font-size: 1.05rem;
    margin-bottom: 0.25rem;
}

/* Callout Alerts */
.info-callout {
    background: var(--primary-blue-light);
    border: 1px solid rgba(37, 99, 235, 0.15);
    padding: 1.5rem;
    border-radius: 12px;
    margin: 2rem 0;
}

.info-callout h4 {
    margin: 0 0 0.5rem 0;
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.info-callout p {
    margin: 0;
    font-size: 0.88rem;
    color: var(--color-text-sub);
}

/* Conversion CTA Panel */
.blog-cta-panel {
    background: linear-gradient(135deg, var(--primary-blue-light) 0%, rgba(16, 185, 129, 0.04) 100%);
    border: 2px solid var(--primary-blue);
    border-radius: 16px;
    padding: 2.2rem;
    text-align: center;
    margin-top: 4rem;
    box-shadow: var(--shadow-premium);
}

.blog-cta-panel h3 {
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: 0.6rem;
}

.blog-cta-panel p {
    font-size: 0.9rem;
    color: var(--color-text-sub);
    margin-bottom: 1.6rem;
}

.btn-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: var(--primary-blue);
    color: #ffffff;
    padding: 0.8rem 2rem;
    border-radius: 10px;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-cta:hover {
    background: var(--primary-blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(37, 99, 235, 0.35);
}

/* Table B2B layouts */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    font-size: 0.88rem;
}

.comparison-table th {
    background: var(--primary-blue-light);
    border-bottom: 2px solid var(--border-color);
    padding: 0.8rem;
    font-weight: 700;
    text-align: left;
}

.comparison-table td {
    padding: 0.8rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--color-text-sub);
}

/* Theme Toggle Button identical copy */
.theme-toggle-btn {
    background: var(--primary-blue-light);
    border: 1px solid var(--border-color);
    padding: 0.45rem 0.9rem;
    border-radius: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--primary-blue);
    transition: var(--transition-smooth);
}

.theme-toggle-btn:hover {
    background: var(--primary-blue);
    color: #ffffff;
    border-color: var(--primary-blue);
}

/* Blog Navigation Button */
.btn-nav-blog {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--primary-blue-light);
    border: 1px solid var(--border-color);
    padding: 0.45rem 0.9rem;
    border-radius: 50px;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--primary-blue);
    text-decoration: none;
    transition: var(--transition-smooth);
}

.btn-nav-blog:hover {
    background: var(--primary-blue);
    color: #ffffff;
    border-color: var(--primary-blue);
}

/* Header controls wrapper */
.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Footer layout */
.blog-footer {
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    text-align: center;
    font-size: 0.78rem;
    color: var(--color-text-light);
}

.trademark-disclaimer {
    font-size: 0.72rem;
    color: var(--color-text-light);
    line-height: 1.5;
    max-width: 780px;
    margin: 0.5rem auto 1.2rem auto;
    text-align: center;
}

@media (max-width: 600px) {
    .article-title {
        font-size: 1.6rem;
    }
}