/* ============================================================
   拾光资源站 · 全站样式（主站数据驱动页面）
   覆盖：index / subject / list / changelog / about
   设计：清新成长绿主题 · 柔和渐变 · 圆角卡片 · 轻装饰
   ============================================================ */
:root{
  --brand:#1b8a5a;        /* 主色·成长绿 */
  --brand-dark:#14663f;
  --brand2:#0d8b7d;       /* 辅色·青 */
  --ink:#1f2933;
  --muted:#6b7785;
  --line:#e6ebf1;
  --bg:#f5f8fc;
  --card:#ffffff;
  --accent:#fff4e0;
  --radius:14px;
  --shadow:0 2px 10px rgba(20,60,40,.06);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 18px}

/* ---------- 头部 / 导航 ---------- */
header.site{background:linear-gradient(120deg,var(--brand),var(--brand2));color:#fff;position:sticky;top:0;z-index:50;box-shadow:0 2px 12px rgba(20,60,40,.18)}
header.site .bar{display:flex;align-items:center;gap:18px;height:62px}
.logo{font-size:20px;font-weight:700;letter-spacing:1px;white-space:nowrap}
.logo small{display:block;font-size:11px;font-weight:400;opacity:.85;letter-spacing:3px}
nav.main{display:flex;flex-wrap:wrap;gap:2px;flex:1}
nav.main a{color:#fff;opacity:.92;padding:6px 12px;border-radius:8px;font-size:15px;white-space:nowrap}
nav.main a:hover{opacity:1;background:rgba(255,255,255,.16);text-decoration:none}
nav.main a.active{background:rgba(255,255,255,.22);font-weight:600}
.searchbox{display:flex;gap:6px}
.searchbox input{border:none;border-radius:8px;padding:7px 12px;font-size:14px;width:150px;outline:none}
.searchbox button{border:none;border-radius:8px;padding:7px 14px;font-size:14px;background:var(--accent);color:#7a5b23;font-weight:600;cursor:pointer}
.searchbox button:hover{filter:brightness(.96)}
@media (max-width:860px){
  header.site .bar{flex-wrap:wrap;height:auto;padding:10px 0}
  .searchbox input{width:110px}
}

/* ---------- 主体 ---------- */
main.wrap{padding-top:26px;padding-bottom:56px;min-height:60vh}
.hero{position:relative;overflow:hidden;background:linear-gradient(135deg,#ffffff 0%,#eaf6ef 55%,#e3f3ee 100%);border:1px solid var(--line);border-radius:18px;padding:48px 40px;box-shadow:0 10px 30px rgba(20,60,40,.08);display:flex;align-items:center;gap:30px}
.hero-text{flex:1;min-width:0}
.hero-art{flex:0 0 300px;align-self:center}
.hero-art img{width:100%;height:auto;display:block;filter:drop-shadow(0 8px 18px rgba(20,60,40,.12))}
@media (max-width:760px){.hero{flex-direction:column;text-align:left;padding:36px 24px}.hero-art{flex:0 0 auto;width:min(280px,82%);margin-top:8px}}
.hero::before{content:"";position:absolute;width:260px;height:260px;border-radius:50%;background:radial-gradient(circle at 35% 35%,rgba(27,138,90,.16),rgba(27,138,90,0) 70%);top:-100px;right:-70px;pointer-events:none}
.hero::after{content:"";position:absolute;width:190px;height:190px;border-radius:50%;background:radial-gradient(circle at 50% 50%,rgba(13,139,125,.15),rgba(13,139,125,0) 70%);bottom:-80px;left:-55px;pointer-events:none}
.hero h1{position:relative;margin:0 0 12px;font-size:32px;letter-spacing:1px}
.hero .lead{position:relative;margin:0;color:#41505f;font-size:17px;max-width:760px}
.hero .lead b{color:var(--brand-dark)}
.cta{position:relative;margin-top:22px;display:flex;flex-wrap:wrap;gap:12px}
.section-title{position:relative;margin:36px 0 16px;font-size:22px;font-weight:700;color:var(--brand-dark);border-left:5px solid var(--brand);border-radius:3px;padding:2px 0 2px 14px;letter-spacing:.5px}
.breadcrumb{font-size:13px;color:var(--muted);margin:4px 0 6px}
.breadcrumb a{color:var(--muted)}
.muted{color:var(--muted)}

/* ---------- 按钮 ---------- */
.btn{display:inline-block;border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:10px;padding:9px 18px;font-size:15px;cursor:pointer;transition:.15s;text-decoration:none}
.btn:hover{border-color:var(--brand);color:var(--brand);text-decoration:none}
.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand2));border-color:transparent;color:#fff;font-weight:600;box-shadow:0 6px 16px rgba(27,138,90,.25)}
.btn.primary:hover{background:linear-gradient(135deg,var(--brand-dark),var(--brand));color:#fff;box-shadow:0 8px 20px rgba(27,138,90,.3)}
.btn.sm{padding:5px 12px;font-size:13px;border-radius:8px}

/* ---------- 网格与卡片 ---------- */
.grid{display:grid;gap:16px}
.grid.subjects{grid-template-columns:1fr 1fr;margin-top:6px}
@media (max-width:760px){.grid.subjects{grid-template-columns:1fr}}
.card{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;box-shadow:var(--shadow);transition:.18s}
.card:hover{box-shadow:0 10px 24px rgba(20,60,40,.12);transform:translateY(-2px)}
.subject-card{display:block;color:var(--ink);border-top:3px solid var(--brand)}
.subject-card:hover{text-decoration:none;border-color:var(--brand)}
.subject-card h3{margin:0 0 6px;font-size:19px;color:var(--brand-dark)}
.subject-card .meta{color:var(--muted);font-size:14px}
.chips{margin-top:12px;display:flex;flex-wrap:wrap;gap:6px}
.chip{display:inline-block;border-radius:20px;padding:2px 11px;font-size:12.5px;background:#eef4f0;color:var(--brand-dark);border:1px solid #d8e8dd}
.chip.gray{background:#f2f4f7;color:#5b6774;border-color:#e6ebf1}
.chip.blue{background:#e8f1fe;color:#0b57b8;border-color:#d6e4fb}
.chip.orange{background:#fdf1e3;color:#a05a12;border-color:#f5ddbe}

.res-grid{grid-template-columns:repeat(3,1fr)}
@media (max-width:1020px){.res-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.res-grid{grid-template-columns:1fr}}
.res-card{display:flex;flex-direction:column;gap:8px}
.res-card .t{font-weight:600;font-size:16px;line-height:1.5}
.res-card .t a{color:var(--ink)}
.res-card .t a:hover{color:var(--brand)}
.res-card .d{font-size:13.5px;color:var(--muted);flex:1}
.res-card .rmeta{display:flex;flex-wrap:wrap;gap:6px}
.res-card .acts{display:flex;flex-wrap:wrap;gap:8px;margin-top:2px}
.res-card .acts .btn{background:#f7faf8}

/* ---------- 学科页 ---------- */
#subject-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}
#subject-grid{margin-top:6px}

/* ---------- 分组展示（年级 → 单元） ---------- */
.res-grid.grouped{display:block}
.grp{margin-bottom:8px}
.grp-title{display:flex;align-items:baseline;gap:10px;font-size:19px;margin:22px 0 6px;padding-bottom:8px;border-bottom:2px solid var(--line);color:var(--brand-dark)}
.grp:first-child .grp-title{margin-top:4px}
.grp-count{font-size:13px;font-weight:400;color:var(--muted)}
.unit-title{font-size:15px;margin:16px 0 10px;padding-left:10px;border-left:3px solid var(--brand2);color:#41505f}
.unit-title .unit-range{font-size:12.5px;color:var(--muted);font-weight:400;margin-left:8px}

/* ---------- 列表页 ---------- */
.layout{display:grid;grid-template-columns:230px 1fr;gap:22px;align-items:start}
@media (max-width:860px){.layout{grid-template-columns:1fr}}
.filters{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;position:sticky;top:78px}
.filters h4{margin:12px 0 6px;font-size:14px;color:#41505f}
.filters h4:first-child{margin-top:0}
.filters select,.filters input[type=text]{width:100%;border:1px solid var(--line);border-radius:8px;padding:7px 10px;font-size:14px;background:#fff;outline:none}
.filters select:focus,.filters input:focus{border-color:var(--brand)}
.filter-actions{margin-top:14px;display:flex;gap:8px}
.results-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.results-head .count{color:var(--muted);font-size:14px}
.results-head .sort{font-size:14px;color:var(--muted)}
.results-head .sort select{border:1px solid var(--line);border-radius:8px;padding:5px 8px;font-size:14px;background:#fff}
.empty-tip{background:#fff;border:1px dashed var(--line);border-radius:var(--radius);padding:36px;text-align:center;color:var(--muted)}

/* ---------- 更新日志 ---------- */
.timeline{margin-top:16px}
.timeline .item{display:flex;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px 18px;margin-bottom:10px;box-shadow:var(--shadow)}
.timeline .date{white-space:nowrap;font-weight:700;color:var(--brand-dark);font-size:14px;min-width:96px}
.timeline .text{font-size:14.5px}

/* ---------- 关于页 ---------- */
.block{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px;margin-bottom:16px;box-shadow:var(--shadow)}
.block h2{margin:0 0 10px;font-size:18px;color:var(--brand-dark)}
.block ul{margin:6px 0 0;padding-left:22px}
.block li{margin:4px 0}

/* ---------- 页脚 ---------- */
footer.site{border-top:1px solid var(--line);background:#fff;padding:18px 0;color:var(--muted);font-size:13.5px;text-align:center}

/* ---------- 打印 ---------- */
@media print{header.site,.searchbox,.cta,.acts{display:none}body{background:#fff}}