/*
Theme Name: GRID
Theme URI: https://chikudenchi.org/
Author: Orcit Inc.
Description: 蓄電池総合メディアGRIDのオリジナルテーマ。日経電子版・東洋経済の中間トーン、誠実で読みやすい経済紙的デザイン。
Version: 0.2.0
Requires at least: 6.0
Requires PHP: 7.4
License: Proprietary
Text Domain: grid
*/

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+JP:wght@400;500;700&family=Noto+Serif+JP:wght@500;700&display=swap');

:root{--primary:#1B2A4E;--primary-dark:#0F1A36;--accent-teal:#0F766E;--accent-amber:#B45309;--text-body:#1F2937;--text-muted:#6B7280;--bg-paper:#FAFAF9;--bg-section:#F5F5F4;--border:#E7E5E4;--font-serif:"Noto Serif JP",serif;--font-sans:"Noto Sans JP",sans-serif;--font-num:"Inter",sans-serif}
*{box-sizing:border-box}
body{margin:0;font-family:var(--font-sans);font-size:17px;line-height:1.9;color:var(--text-body);background:var(--bg-paper);font-feature-settings:"palt" 1;-webkit-font-smoothing:antialiased}
a{color:var(--accent-teal);text-decoration:none}
a:hover{color:var(--primary);text-decoration:underline}
h1,h2,h3,h4{font-family:var(--font-serif);font-weight:700;color:var(--primary);line-height:1.45;letter-spacing:.01em;margin:0 0 .6em}
h1{font-size:clamp(28px,4.4vw,44px);letter-spacing:.02em}
h2{font-size:clamp(22px,2.6vw,28px);padding-bottom:12px;position:relative;margin-top:2.4em}
h2::after{content:"";position:absolute;left:0;bottom:0;width:40px;height:2px;background:var(--accent-teal)}
h3{font-size:21px;margin-top:2em}
p{margin:0 0 1.4em}
img,svg{max-width:100%;display:block}
hr{border:0;border-top:1px solid var(--border);margin:48px 0}
.container{width:100%;max-width:1120px;margin:0 auto;padding:0 28px}
.reading{max-width:720px;margin:0 auto}
.section{padding:80px 0}
.section--alt{background:var(--bg-section)}
.eyebrow{display:inline-block;font-size:12px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--accent-teal);margin-bottom:12px;font-family:var(--font-num)}
.muted{color:var(--text-muted)}
.center{text-align:center}
.num{font-family:var(--font-num);font-feature-settings:"tnum" 1}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(250,250,249,.95);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--border)}
.site-header__inner{max-width:1120px;margin:0 auto;padding:14px 28px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.site-header__logo a,.site-header__logo{font-family:var(--font-serif);font-weight:700;color:var(--primary);font-size:22px;letter-spacing:.18em;text-decoration:none}
.site-nav{display:flex;gap:28px;align-items:center;list-style:none;padding:0;margin:0}
.site-nav a,.site-nav li a{color:var(--primary);font-size:14px;font-weight:500;letter-spacing:.02em;text-decoration:none}
.site-nav a:hover{color:var(--accent-teal)}

/* Hero */
.hero{padding:96px 0 80px;text-align:center;background:var(--bg-paper);border-bottom:1px solid var(--border)}
.hero h1{font-size:clamp(34px,5.6vw,52px);line-height:1.3;margin-bottom:24px}
.hero p.lead,.hero__sub{font-size:17px;color:var(--text-muted);max-width:660px;margin:0 auto 36px;line-height:1.95}
.hero__ctas{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 24px;font-size:15px;font-weight:600;letter-spacing:.02em;border-radius:4px;border:1px solid transparent;transition:all .18s;text-decoration:none}
.btn--primary{background:var(--primary);color:#fff}
.btn--primary:hover{background:var(--primary-dark);color:#fff;text-decoration:none}
.btn--ghost{background:transparent;color:var(--primary);border-color:var(--border)}
.btn--ghost:hover{background:#fff;border-color:var(--primary);color:var(--primary);text-decoration:none}
.btn--text{background:none;color:var(--accent-teal);padding:0;font-weight:600}
.btn--text::after{content:" →"}

/* Cards */
.category-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px}
.category-card{display:block;padding:32px 24px;background:#fff;border:1px solid var(--border);border-radius:6px;text-decoration:none;color:inherit;transition:all .18s}
.category-card:hover{border-color:var(--primary);transform:translateY(-2px);text-decoration:none;box-shadow:0 4px 16px rgba(15,26,54,.08)}
.category-card h3{font-size:18px;margin:0 0 8px}
.category-card p{font-size:14px;color:var(--text-muted);line-height:1.7;margin:0}

.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:36px}
.article-card{background:#fff;border:1px solid var(--border);border-radius:6px;overflow:hidden;text-decoration:none;color:inherit;display:flex;flex-direction:column;transition:all .18s}
.article-card:hover{box-shadow:0 4px 16px rgba(15,26,54,.08);transform:translateY(-2px);text-decoration:none}
.article-card__thumb{aspect-ratio:16/9;background:var(--bg-section);display:flex;align-items:center;justify-content:center;color:var(--text-muted);font-size:12px;letter-spacing:.1em;border-bottom:1px solid var(--border);font-family:var(--font-num)}
.article-card__body{padding:20px 22px;flex:1;display:flex;flex-direction:column}
.article-card__cat{font-family:var(--font-num);font-size:11px;font-weight:600;color:var(--accent-teal);letter-spacing:.12em;text-transform:uppercase;margin-bottom:6px}
.article-card h3{font-size:17px;line-height:1.55;margin:0 0 10px}
.article-card__meta{margin-top:auto;font-size:12px;color:var(--text-muted);font-family:var(--font-num)}

/* News Highlights */
.news-highlights{border-top:1px solid var(--border);border-bottom:1px solid var(--border);padding:28px 0;background:var(--bg-paper)}
.news-highlights__inner{display:grid;grid-template-columns:160px 1fr;gap:32px;align-items:start}
.news-highlights__label{font-family:var(--font-num);font-size:11px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--accent-teal);padding-top:4px}
.news-highlights__list{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.news-highlights__item{display:grid;grid-template-columns:100px 110px 1fr;gap:18px;align-items:baseline;font-size:14px;line-height:1.6}
.news-highlights__date{color:var(--text-muted);font-family:var(--font-num);font-size:13px}
.news-highlights__cat{font-family:var(--font-num);font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--primary)}

/* Compare table */
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:6px;background:#fff}
table.compare{width:100%;border-collapse:collapse;font-size:14px;min-width:720px}
table.compare thead th{background:var(--bg-section);color:var(--primary);font-family:var(--font-serif);font-weight:700;text-align:left;padding:14px 16px;border-bottom:1px solid var(--border)}
table.compare tbody td{padding:16px;border-bottom:1px solid var(--border)}
table.compare tbody tr.is-recommend{background:#FEF3C7}
.badge{display:inline-block;font-size:11px;font-weight:700;padding:3px 8px;border-radius:999px;margin-left:8px}
.badge--amber{background:var(--accent-amber);color:#fff}

/* Footer */
.site-footer{background:var(--primary-dark);color:#D6D3D1;padding:56px 0 28px;margin-top:80px;font-size:14px}
.site-footer__cols{display:grid;grid-template-columns:repeat(4,1fr);gap:36px}
.site-footer h4{color:#fff;font-family:var(--font-serif);font-size:14px;margin:0 0 16px;font-weight:700}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin-bottom:10px}
.site-footer a{color:#D6D3D1;text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.site-footer__bottom{margin-top:48px;padding-top:20px;border-top:1px solid rgba(255,255,255,.1);display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#A8A29E}
.site-footer__logo{font-family:var(--font-serif);font-weight:700;letter-spacing:.18em;color:#fff;font-size:18px}

/* Section head */
.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px;flex-wrap:wrap}
.section-head>div{flex:1;min-width:280px}
.section-head h2{margin:0;padding-bottom:12px}
.section-head__lead{color:var(--text-muted);font-size:15px;margin:12px 0 0;max-width:640px}

/* Article single */
.article-header{padding:56px 0 36px;border-bottom:1px solid var(--border);background:var(--bg-paper)}
.article-cat{display:inline-block;font-family:var(--font-num);font-size:11px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:#fff;background:var(--primary);padding:4px 10px;border-radius:4px;margin-bottom:20px}
.article-meta{display:flex;gap:18px;font-size:13px;color:var(--text-muted);margin:18px 0 0;font-family:var(--font-num);flex-wrap:wrap}
.article-body{padding:56px 0}

/* Editor block */
.editor{display:grid;grid-template-columns:220px 1fr;gap:40px;align-items:start}
.editor__photo{aspect-ratio:1/1;width:100%;background:#E7E5E4;border-radius:6px;display:flex;align-items:flex-end;justify-content:center;padding:12px;color:var(--text-muted);font-size:12px;letter-spacing:.1em}

/* Wide media */
@media (max-width:880px){.category-grid,.article-grid{grid-template-columns:repeat(2,1fr)}.editor{grid-template-columns:1fr}.news-highlights__inner{grid-template-columns:1fr;gap:16px}.news-highlights__item{grid-template-columns:90px 90px 1fr;gap:12px;font-size:13px}}
@media (max-width:760px){.site-footer__cols{grid-template-columns:repeat(2,1fr)}}
@media (max-width:540px){.category-grid,.article-grid{grid-template-columns:1fr}.news-highlights__item{grid-template-columns:1fr;gap:2px}}
@media (max-width:420px){.site-footer__cols{grid-template-columns:1fr}}