/* ===== GT创客空间 · 浅色清新教育风主题 ===== */
:root {
  --bg: #f3f7fb;
  --bg-2: #eaf1f8;
  --panel: #ffffff;
  --panel-2: #f1f6fb;
  --line: #dde6f0;
  --text: #1f2d3d;
  --muted: #647489;
  --accent1: #0ea5e9;   /* 天蓝 */
  --accent2: #14b8a6;   /* 青绿 */
  --green: #16a34a;
  --amber: #d97706;
  --red: #dc2626;
  --grad: linear-gradient(135deg, #0ea5e9 0%, #14b8a6 100%);
  --shadow: 0 10px 30px rgba(20, 60, 100, .10);
  --shadow-sm: 0 4px 14px rgba(20, 60, 100, .08);
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1100px 560px at 85% -12%, rgba(20, 184, 166, .14), transparent 60%),
    radial-gradient(900px 500px at -10% 8%, rgba(14, 165, 233, .14), transparent 55%),
    var(--bg);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.65;
}

/* 细网格背景 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(20, 60, 100, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 60, 100, .04) 1px, transparent 1px);
  background-size: 46px 46px;
  pointer-events: none;
  z-index: 0;
}

a { color: var(--accent1); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 20px; position: relative; z-index: 1; }

/* ===== 导航 ===== */
.navbar {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, .82);
  border-bottom: 1px solid var(--line);
}
.navbar .wrap { display: flex; align-items: center; height: 62px; gap: 18px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .5px; }
.brand .logo {
  width: 30px; height: 30px; border-radius: 8px; background: var(--grad);
  display: grid; place-items: center; color: #fff; font-weight: 900;
  box-shadow: 0 4px 14px rgba(14, 165, 233, .35);
}
.brand b { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.nav-links { display: flex; gap: 6px; margin-left: 10px; }
.nav-links a {
  color: var(--muted); padding: 8px 12px; border-radius: 8px; font-size: 14px;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); background: var(--panel-2); text-decoration: none; }
.nav-right { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.nav-user { color: var(--muted); font-size: 14px; }
.nav-user b { color: var(--text); }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--panel); color: var(--text); cursor: pointer;
  font-size: 14px; font-weight: 600; transition: .15s;
}
.btn:hover { border-color: var(--accent1); text-decoration: none; }
.btn-primary { background: var(--grad); border: none; color: #fff; box-shadow: 0 6px 18px rgba(14, 165, 233, .30); }
.btn-primary:hover { filter: brightness(1.05); }
.btn-ghost { background: transparent; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-danger { color: var(--red); border-color: rgba(220, 38, 38, .35); }
.btn-danger:hover { background: rgba(220, 38, 38, .08); }
.btn-success { color: var(--green); border-color: rgba(22, 163, 74, .35); }
.btn-success:hover { background: rgba(22, 163, 74, .08); }

/* ===== Hero ===== */
.hero { padding: 70px 0 40px; }
.hero h1 {
  font-size: 46px; line-height: 1.15; margin: 0 0 16px; font-weight: 900;
  background: linear-gradient(120deg, #0c4a6e 8%, var(--accent1) 50%, var(--accent2) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p { color: var(--muted); font-size: 18px; max-width: 720px; margin: 0 0 26px; }
.hero .cta { display: flex; gap: 14px; flex-wrap: wrap; }
.tag-line {
  display: inline-flex; gap: 8px; align-items: center; font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 13px; color: var(--accent2); border: 1px solid var(--line); padding: 6px 12px; border-radius: 999px;
  background: rgba(20, 184, 166, .08); margin-bottom: 18px;
}

/* ===== 区块标题 ===== */
.section { padding: 36px 0; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 20px; }
.section-head h2 { font-size: 26px; margin: 0; }
.section-head .sub { color: var(--muted); font-size: 14px; }

/* ===== 卡片网格 ===== */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; grid-auto-rows: 1fr; }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  transition: .18s; position: relative; box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column; height: 100%;
}
.card:hover { border-color: rgba(14, 165, 233, .55); transform: translateY(-3px); box-shadow: var(--shadow); }
.card .cover {
  height: 132px; width: 100%; display: grid; place-items: center; font-size: 52px; flex: none;
  background: radial-gradient(400px 200px at 30% 0%, rgba(14, 165, 233, .16), transparent 70%), var(--panel-2);
  border-bottom: 1px solid var(--line);
}
.cover-img { width: 100%; height: 150px; flex: none; object-fit: cover; object-position: center; display: block; border-bottom: 1px solid var(--line); background: var(--panel-2); }
.card .body { padding: 16px; flex: 1; display: flex; flex-direction: column; }
.card .body h3 { margin: 0 0 8px; font-size: 17px; line-height: 1.35; color: var(--text); }
.card .body p { color: var(--muted); font-size: 13px; margin: 0 0 12px; }
.card .meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

.badge {
  font-size: 12px; padding: 3px 10px; border-radius: 999px;
  background: rgba(14, 165, 233, .12); color: #0c7fb3; border: 1px solid rgba(14, 165, 233, .28);
}
.badge.violet { background: rgba(20, 184, 166, .12); color: #0d8f80; border-color: rgba(20, 184, 166, .3); }
.chip { font-size: 12px; padding: 2px 9px; border-radius: 999px; background: var(--panel-2); color: var(--muted); border: 1px solid var(--line); }

/* ===== 筛选条 ===== */
.filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 22px; }
.filters a {
  font-size: 13px; padding: 7px 14px; border-radius: 999px; border: 1px solid var(--line);
  color: var(--muted); background: var(--panel);
}
.filters a.active, .filters a:hover { color: #fff; background: var(--grad); border-color: transparent; text-decoration: none; }

/* ===== 表单 ===== */
.form-card {
  max-width: 460px; margin: 40px auto; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow);
}
.form-card h2 { margin: 0 0 6px; color: var(--text); }
.form-card .hint { color: var(--muted); font-size: 13px; margin: 0 0 22px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 11px 13px; border-radius: 10px; border: 1px solid var(--line);
  background: #fff; color: var(--text); font-size: 14px; font-family: inherit;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--accent1); box-shadow: 0 0 0 3px rgba(14, 165, 233, .15);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

/* ===== 提示 ===== */
.flash { padding: 12px 16px; border-radius: 10px; margin-bottom: 16px; font-size: 14px; border: 1px solid; }
.flash.ok { background: rgba(22, 163, 74, .1); border-color: rgba(22, 163, 74, .3); color: var(--green); }
.flash.err { background: rgba(220, 38, 38, .08); border-color: rgba(220, 38, 38, .3); color: var(--red); }
.flash.info { background: rgba(14, 165, 233, .08); border-color: rgba(14, 165, 233, .3); color: #0c7fb3; }

/* ===== 状态药丸 ===== */
.pill { font-size: 12px; padding: 3px 10px; border-radius: 999px; font-weight: 600; }
.pill.pending { background: rgba(217, 119, 6, .12); color: var(--amber); }
.pill.approved { background: rgba(22, 163, 74, .12); color: var(--green); }
.pill.denied { background: rgba(220, 38, 38, .12); color: var(--red); }
.pill.active { background: rgba(22, 163, 74, .12); color: var(--green); }
.pill.disabled { background: rgba(220, 38, 38, .12); color: var(--red); }

/* ===== 表格（后台） ===== */
.admin-wrap { display: grid; grid-template-columns: 220px 1fr; gap: 22px; align-items: start; }
.admin-side { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; position: sticky; top: 80px; box-shadow: var(--shadow-sm); }
.admin-side a { display: block; padding: 10px 12px; border-radius: 8px; color: var(--muted); font-size: 14px; margin-bottom: 4px; }
.admin-side a:hover, .admin-side a.active { background: var(--panel-2); color: var(--text); text-decoration: none; }
.admin-side .ttl { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; padding: 6px 12px; }

.table { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.table th, .table td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); font-size: 14px; }
.table th { background: var(--panel-2); color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .5px; }
.table tr:last-child td { border-bottom: none; }
.table tr:hover td { background: rgba(14, 165, 233, .04); }
.table .actions { display: flex; gap: 8px; flex-wrap: wrap; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat { background: linear-gradient(180deg, #fff, var(--panel-2)); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow-sm); }
.stat .n { font-size: 30px; font-weight: 800; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .l { color: var(--muted); font-size: 13px; }

/* ===== 详情页 ===== */
.detail-wrap { max-width: 900px; margin: 0 auto; }
.detail-hero2 {
  display: flex; gap: 24px; align-items: flex-start;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; margin-bottom: 22px; box-shadow: var(--shadow-sm);
}
.detail-cover { flex: 0 0 300px; border-radius: 10px; overflow: hidden; border: 1px solid var(--line); background: var(--panel-2); }
.detail-cover img { width: 100%; height: 210px; object-fit: cover; display: block; }
.detail-cover-emoji { height: 210px; display: grid; place-items: center; font-size: 84px; }
.detail-info { flex: 1; min-width: 0; }
.detail-meta-top { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.detail-info h1 { margin: 0 0 12px; font-size: 26px; line-height: 1.3; color: var(--text); }
.detail-tags { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0 14px; }
.pill.tag { color: #0c7fb3; border: 1px solid rgba(14, 165, 233, .28); background: rgba(14, 165, 233, .08); text-decoration: none; }
.video-box { background: #0b1220; border-radius: var(--radius); padding: 14px; margin-bottom: 22px; box-shadow: var(--shadow-sm); }
.video-box video { width: 100%; border-radius: 8px; display: block; max-height: 480px; background: #000; }
.video-hint { text-align: center; color: #9fb3c4; font-size: 13px; margin: 10px 0 0; }
.prose { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 34px; box-shadow: var(--shadow-sm); }
.prose-head {
  font-family: "SimHei", "Microsoft YaHei", sans-serif; font-size: 17px; color: var(--text);
  padding-bottom: 10px; margin-bottom: 16px; border-bottom: 2px solid var(--grad);
  border-bottom-color: #0ea5e9;
}
.prose p { color: var(--text); margin: 0 0 12px; line-height: 1.85; }
.prose img { max-width: 100%; border-radius: 8px; margin: 14px auto; display: block; box-shadow: var(--shadow-sm); }
.prose a { color: #0c7fb3; word-break: break-all; }
.detail-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 22px; }
.nav-item {
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 14px; font-size: 13px; color: var(--muted); max-width: 34%;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; box-shadow: var(--shadow-sm);
}
.nav-item:hover { border-color: rgba(14, 165, 233, .5); color: var(--text); }
.nav-item.center { max-width: none; }
.nav-item.right { text-align: right; }

@media (max-width: 760px) {
  .detail-hero2 { flex-direction: column; }
  .detail-cover { flex: none; width: 100%; }
  .detail-nav { flex-direction: column; }
  .nav-item { max-width: none; }
}

/* ===== 课题成果卡片 ===== */
.project-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow-sm); }
.project-badge { background: linear-gradient(135deg, rgba(14,165,233,.15), rgba(20,184,166,.15)); color: #0e7490; border: 1px solid rgba(14,165,233,.35); font-size: 13px; letter-spacing: .5px; }
.project-desc { color: var(--muted); margin: 8px 0 18px; max-width: 760px; }
.project-metrics { display: flex; gap: 12px; flex-wrap: wrap; }
.project-metrics span { background: var(--panel-2); border: 1px solid var(--line); padding: 8px 16px; border-radius: 999px; font-size: 13px; font-weight: 600; color: var(--text); }

/* Hero 内课题卡片 */
.hero-project { margin: 0 0 24px; max-width: 760px; text-align: left; }
.hero-project h2 { margin: 10px 0 0; font-size: 21px; color: var(--text); }

/* ===== 空状态 ===== */
.empty { text-align: center; padding: 60px 20px; color: var(--muted); }

footer { border-top: 1px solid var(--line); margin-top: 50px; padding: 26px 0; color: var(--muted); font-size: 13px; background: rgba(255,255,255,.5); }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

@media (max-width: 760px) {
  .hero h1 { font-size: 34px; }
  .admin-wrap { grid-template-columns: 1fr; }
  .admin-side { position: static; }
  .form-row { grid-template-columns: 1fr; }
}