/* --- Base Settings --- */
:root {
    /* 前回のブルーグレー系配色に戻す */
    --primary: #2c3e50;     /* 信頼感のあるダークブルー */
    --accent: #3498db;      /* 明るいブルー */
    --text-main: #333333;
    --text-sub: #546e7a;
    --bg-body: #f4f6f7;     /* クリーンなグレー背景 */
    --bg-card: #ffffff;
    --border: #cfd8dc;
}

body {
    font-family: 'Noto Sans JP', "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    margin: 0;
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; padding: 0; margin: 0; }

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 16px;
}

/* --- Header --- */
.header {
    background: #fff;
    border-bottom: 1px solid var(--border);
    height: 64px;
    display: flex;
    align-items: center;
}

.header-inner {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.3rem;
    color: var(--primary);
}

.logo-img {
    height: 40px;
    width: auto;
}

.nav-link {
    font-size: 0.9rem;
    color: var(--text-sub);
    font-weight: 500;
}
.nav-link:hover { color: var(--accent); }

/* --- Page Description Bar (SEO Text Area) --- */
.page-desc-bar {
    background: #fff;
    padding: 32px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 32px;
}

.seo-text {
    font-size: 0.95rem;
    color: var(--text-main);
    line-height: 1.8;
    margin: 0;
}

.seo-text strong {
    font-size: 1.1rem;
    color: var(--primary);
    display: block;
    margin-bottom: 8px;
}

/* --- Main Layout --- */
.section { padding-bottom: 40px; }

.category-label {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-sub);
    margin-bottom: 12px;
    border-left: 4px solid var(--accent);
    padding-left: 8px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.category-label i { color: var(--accent); }

/* --- Tool Grid --- */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

/* --- Tool Card --- */
.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    transition: all 0.2s ease;
}

.tool-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    border-color: var(--accent);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.tool-icon {
    font-size: 2rem;
    color: var(--primary);
}

.status-badge {
    font-size: 0.75rem;
    padding: 3px 10px;
    border-radius: 12px;
    font-weight: 700;
    background: #eceff1;
    color: var(--text-sub);
}
.status-badge.new { background: #ffe0b2; color: #e65100; }

.card-body { flex-grow: 1; }

.card-body h2 {
    font-size: 1.15rem;
    margin: 0 0 8px 0;
    color: var(--primary);
}

.card-body p {
    font-size: 0.9rem;
    color: var(--text-sub);
    margin: 0 0 20px 0;
}

.card-footer { margin-top: auto; }

/* Buttons */
.btn-open {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    width: 100%;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    padding: 10px 0;
    border-radius: 4px;
    font-size: 0.95rem;
}
.btn-open:hover { background: #2980b9; gap: 12px; }

.btn-open.external {
    background: #fff;
    color: var(--accent);
    border: 1px solid var(--accent);
}
.btn-open.external:hover { background: #e1f5fe; }

/* Disabled State */
.tool-card.disabled {
    background: #f5f5f5;
    opacity: 0.7;
    border-style: dashed;
    border-color: var(--border);
    box-shadow: none;
}
.tool-card.disabled:hover { transform: none; border-color: var(--border); }
.tool-card.disabled .tool-icon { color: #b0bec5; }

.btn-disabled {
    display: block;
    width: 100%;
    text-align: center;
    background: #cfd8dc;
    color: #fff;
    padding: 10px 0;
    border-radius: 4px;
    font-size: 0.9rem;
    cursor: not-allowed;
    font-weight: 700;
}

/* --- About & Footer --- */
.bg-gray {
    background: #eceff1;
    border-top: 1px solid var(--border);
    margin-top: 60px;
    padding: 40px 0;
    text-align: center;
}

.sub-title {
    font-size: 1.2rem;
    margin-bottom: 16px;
    color: var(--primary);
}

.about-text {
    font-size: 0.9rem;
    color: var(--text-main);
    max-width: 600px;
    margin: 0 auto 32px auto;
}

.footer-copy {
    font-size: 0.85rem;
    color: var(--text-sub);
}

/* --- STカコモン紹介セクション --- */
.kakomon-intro {
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 48px 0;
}

.intro-header {
    margin-bottom: 28px;
}

.intro-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent);
    background: #e8f4fd;
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 10px;
}

.intro-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0 0 10px 0;
    line-height: 1.4;
}

.intro-lead {
    font-size: 1rem;
    color: var(--text-sub);
    margin: 0;
}

.intro-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 28px;
}

.intro-text p {
    font-size: 0.95rem;
    color: var(--text-main);
    line-height: 1.8;
    margin: 0 0 14px 0;
}
.intro-text p:last-child { margin-bottom: 0; }

.intro-features {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.feature-item i {
    color: #27ae60;
    font-size: 1.2rem;
    margin-top: 2px;
    flex-shrink: 0;
}

.feature-item strong {
    display: block;
    font-size: 0.95rem;
    color: var(--primary);
    margin-bottom: 2px;
}

.feature-item span {
    font-size: 0.85rem;
    color: var(--text-sub);
}

.btn-kakomon {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
    padding: 14px 32px;
    border-radius: 6px;
    transition: background 0.2s, gap 0.2s;
}
.btn-kakomon:hover { background: #2980b9; gap: 12px; }

/* --- 国試コラムセクション --- */
.column-section {
    background: #f4f6f7;
    padding: 48px 0;
    border-bottom: 1px solid var(--border);
}

.column-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 24px;
}

.column-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 24px;
}

.column-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0 0 12px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.column-card h3 i { color: var(--accent); }

.column-card p {
    font-size: 0.9rem;
    color: var(--text-main);
    line-height: 1.8;
    margin: 0;
}

/* --- アプリ誘導バナー --- */
.app-banner {
    background: var(--primary);
    color: #fff;
    padding: 12px 0;
}
.app-banner-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}
.app-banner-inner span {
    font-size: 0.95rem;
    font-weight: 500;
}
.app-banner-inner i { margin-right: 6px; }
.app-banner-btn {
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    font-size: 0.9rem;
    padding: 8px 20px;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
    transition: background 0.2s;
}
.app-banner-btn:hover { background: #2980b9; }

/* --- 科目一覧 --- */
.subjects-section {
    background: #fff;
    padding: 48px 0;
    border-bottom: 1px solid var(--border);
}
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 24px;
}
.subject-group {
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 20px 24px;
}
.subject-group h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0 0 14px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}
.subject-group h3 i { color: var(--accent); }
.subject-group ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.subject-group ul li {
    font-size: 0.88rem;
    color: var(--text-main);
    padding: 5px 0;
    border-bottom: 1px solid var(--border);
    line-height: 1.5;
}
.subject-group ul li:last-child { border-bottom: none; }

/* --- FAQ --- */
.faq-section {
    background: var(--bg-body);
    padding: 48px 0;
    border-bottom: 1px solid var(--border);
}
.faq-list {
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-width: 800px;
}
.faq-item {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 18px 22px;
}
.faq-q {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}
.faq-q i { color: var(--accent); font-size: 1rem; margin-top: 2px; flex-shrink: 0; }
.faq-a {
    font-size: 0.9rem;
    color: var(--text-main);
    line-height: 1.8;
    padding-left: 26px;
}

/* --- 使い方ガイド --- */
.howto-section {
    background: #fff;
    padding: 48px 0;
    border-bottom: 1px solid var(--border);
}
.howto-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 24px;
}
.howto-step {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
}
.step-num {
    width: 40px;
    height: 40px;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    font-size: 1.2rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.step-body h3 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0 0 6px 0;
}
.step-body p {
    font-size: 0.88rem;
    color: var(--text-sub);
    margin: 0;
    line-height: 1.7;
}

/* --- Responsive --- */
@media (max-width: 600px) {
    .header-inner { padding: 0 12px; }
    .logo a { font-size: 1.1rem; }
    .logo-img { height: 32px; }
    .tool-grid { grid-template-columns: 1fr; }
    .intro-body { grid-template-columns: 1fr; gap: 20px; }
    .intro-title { font-size: 1.2rem; }
    .column-grid { grid-template-columns: 1fr; }
    .kakomon-intro, .column-section { padding: 32px 0; }
    .subjects-grid { grid-template-columns: 1fr; }
    .howto-steps { grid-template-columns: 1fr 1fr; }
    .app-banner-inner { justify-content: center; text-align: center; }
}