/* ============================================================
   SourcingCraft - minimal native CSS, blue palette, responsive
   ============================================================ */
:root {
  --blue-900: #0f2f5c;
  --blue-700: #1e4f8c;
  --blue-600: #2563eb;
  --blue-500: #3b82f6;
  --ink: #1f2a37;
  --muted: #6b7280;
  --bg: #f6f8fb;
  --line: #e3e8f0;
  --white: #fff;
  --danger: #dc2626;
  --ok: #16a34a;
  --radius: 10px;
  --shadow: 0 4px 16px rgba(15, 47, 92, .08);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--blue-600); text-decoration: none; }
img { max-width: 100%; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); }
.small { font-size: .8rem; }
.center { text-align: center; }

/* ---------- header / nav ---------- */
.site-header {
  background: var(--blue-900);
  color: #fff;
  position: sticky; top: 0; z-index: 20;
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 12px 20px; flex-wrap: wrap;
}
.brand { font-size: 1.35rem; font-weight: 800; color: #fff; letter-spacing: .3px; }
.brand span { color: var(--blue-500); }
.nav-links { display: flex; gap: 4px; flex-wrap: wrap; }
.nav-links a {
  color: rgba(255,255,255,.82); padding: 6px 14px; border-radius: 8px; font-size: .95rem;
}
.nav-links a:hover { color: #fff; background: rgba(255,255,255,.1); }
.nav-links a.active { color: #fff; background: var(--blue-600); }
.lang-toggle { display: flex; gap: 4px; }
.lang-btn {
  border: 1px solid rgba(255,255,255,.3); background: transparent; color: #fff;
  padding: 4px 12px; border-radius: 20px; cursor: pointer; font-size: .82rem;
}
.lang-btn.active { background: #fff; color: var(--blue-900); border-color: #fff; }

/* ---------- buttons ---------- */
.btn {
  display: inline-block; border: 0; cursor: pointer; border-radius: 8px;
  padding: 11px 22px; font-size: .95rem; font-weight: 600; text-align: center;
  transition: filter .15s, background .15s;
}
.btn:hover { filter: brightness(1.08); }
.btn-primary { background: var(--blue-600); color: #fff; }
.btn-outline { background: transparent; border: 1.5px solid var(--blue-600); color: var(--blue-600); }
.btn-outline:hover { background: var(--blue-600); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-block { display: block; width: 100%; }
.btn-sm { padding: 6px 12px; font-size: .82rem; border-radius: 6px; }

/* ---------- hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--blue-900) 0%, var(--blue-700) 60%, var(--blue-600) 100%);
  color: #fff; padding: 84px 20px 96px; text-align: center;
}
.hero-title { font-size: 2.6rem; line-height: 1.2; margin: 0 0 16px; font-weight: 800; }
.hero-sub { font-size: 1.15rem; color: rgba(255,255,255,.85); max-width: 680px; margin: 0 auto 30px; }
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero .btn-primary { background: #fff; color: var(--blue-900); }
.hero .btn-outline { border-color: #fff; color: #fff; }
.hero .btn-outline:hover { background: #fff; color: var(--blue-900); }

/* ---------- sections ---------- */
.section { padding: 56px 20px; }
.section-alt { background: var(--white); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-title {
  color: var(--blue-900); font-size: 1.5rem; font-weight: 800; margin: 0 0 24px;
  padding-bottom: 10px; border-bottom: 3px solid var(--blue-500);
}
.page-title { color: var(--blue-900); font-size: 2rem; font-weight: 800; margin: 0 0 8px; }
.page-sub { color: var(--muted); margin: 0 0 32px; }

/* ---------- grids / tiles / cards ---------- */
.grid-4, .grid-3, .grid-2 { display: grid; gap: 20px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; } .hero-title { font-size: 2rem; } }

.tile {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow);
}
.tile h3 { color: var(--blue-700); margin: 0 0 8px; font-size: 1.05rem; }

.card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow); display: flex; flex-direction: column;
}
.card .card-body { padding: 18px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.card h3 { margin: 0; color: var(--blue-900); font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: .9rem; flex: 1; }
.card-img {
  height: 150px; background-size: cover; background-position: center;
  display: flex; align-items: center; justify-content: center;
}
.card-img.placeholder { background: repeating-linear-gradient(135deg, var(--blue-100, #dbeafe) 0 14px, #eef4ff 14px 28px); color: var(--muted); }
.tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tags span {
  font-size: .72rem; padding: 2px 10px; border-radius: 20px;
  background: #e6efff; color: var(--blue-700); font-weight: 600;
}
.empty { color: var(--muted); padding: 10px 0; }

.check-list { list-style: none; padding: 0; margin: 0 0 24px; }
.check-list li { padding: 8px 0 8px 30px; position: relative; }
.check-list li::before {
  content: "✓"; position: absolute; left: 0; top: 8px; width: 20px; height: 20px;
  background: var(--blue-600); color: #fff; border-radius: 50%;
  font-size: .78rem; text-align: center; line-height: 20px;
}
.check-list.small li::before { top: 10px; }
.center-cta { text-align: center; }

/* ---------- portal ---------- */
.portal-wrap { display: grid; grid-template-columns: 1.2fr .8fr; gap: 32px; align-items: start; }
@media (max-width: 760px) { .portal-wrap { grid-template-columns: 1fr; } }
.portal-card { max-width: 420px; }
.portal-card h3 { margin: 0 0 16px; color: var(--blue-900); }

/* ---------- forms ---------- */
.form { display: flex; flex-direction: column; gap: 10px; }
.form label { font-size: .85rem; color: var(--ink); font-weight: 600; display: flex; flex-direction: column; gap: 6px; }
.form input, .form textarea, .form select {
  font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px;
  background: #fbfcfe; width: 100%; color: var(--ink);
}
.form input:focus, .form textarea:focus, .form select:focus { outline: 2px solid var(--blue-500); border-color: transparent; }
.inline-form { display: inline-flex; gap: 6px; align-items: center; }

/* ---------- table ---------- */
.table-wrap { overflow-x: auto; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); }
.table { width: 100%; border-collapse: collapse; font-size: .9rem; min-width: 640px; }
.table th, .table td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
.table th { background: #eef3fb; color: var(--blue-900); font-size: .82rem; }
.table tbody tr:hover { background: #f8fafd; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.assign-form select { max-width: 150px; padding: 6px 8px; border: 1px solid var(--line); border-radius: 6px; }

/* ---------- admin ---------- */
.admin-body { background: var(--bg); }
.admin-bar { background: var(--blue-900); color: #fff; padding: 10px 20px; }
.admin-bar-inner { max-width: 1120px; margin: 0 auto; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.admin-brand { color: #fff; }
.admin-brand span { color: var(--blue-500); }
.admin-bar form { margin-left: auto; }
.admin-wrap { max-width: 1120px; margin: 24px auto; padding: 0 20px; }
.admin-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px; }
.admin-tabs a {
  padding: 9px 18px; border-radius: 8px; background: var(--white); color: var(--blue-700);
  border: 1px solid var(--line); font-weight: 600;
}
.admin-tabs a.active { background: var(--blue-600); color: #fff; border-color: var(--blue-600); }
.admin-subtabs { display: flex; gap: 6px; margin-bottom: 16px; }
.admin-subtabs a { padding: 6px 14px; border-radius: 20px; color: var(--muted); font-size: .88rem; }
.admin-subtabs a.active { background: #e6efff; color: var(--blue-700); font-weight: 700; }
.admin-section {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; margin-bottom: 20px; box-shadow: var(--shadow);
}
.admin-section h2 { margin: 0 0 16px; color: var(--blue-900); font-size: 1.1rem; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-grid .span2 { grid-column: span 2; }
@media (max-width: 640px) { .form-grid { grid-template-columns: 1fr; } .form-grid .span2 { grid-column: span 1; } }
.form-actions { display: flex; gap: 10px; }

.admin-login-body, .admin-body { min-height: 100vh; }
.admin-login-box {
  max-width: 380px; margin: 10vh auto; background: var(--white);
  border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 32px 28px;
}
.admin-login-brand { font-size: 1.4rem; font-weight: 800; color: var(--blue-900); margin-bottom: 20px; }
.admin-login-brand span { color: var(--blue-500); }
.admin-login-brand i { font-style: normal; font-size: .95rem; color: var(--muted); font-weight: 400; }

/* ---------- alerts / misc ---------- */
.alert { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; font-size: .9rem; }
.alert-danger { background: #fdeaea; color: #b91c1c; border: 1px solid #f5c2c2; }
.alert-success { background: #e8f7ee; color: var(--ok); border: 1px solid #bfe6ce; }
.dash-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }

/* ---------- footer ---------- */
.site-footer { background: var(--blue-900); color: rgba(255,255,255,.75); padding: 34px 20px; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 24px; }
@media (max-width: 640px) { .footer-grid { grid-template-columns: 1fr; } }
.site-footer strong { font-size: 1.15rem; color: #fff; }
.site-footer .footer-brand-sub { color: var(--blue-500); }
.footer-col { display: flex; flex-direction: column; gap: 8px; }
.footer-col p { margin: 0; }
.footer-col a { color: rgba(255,255,255,.78); font-size: .9rem; }
.footer-col a:hover { color: #fff; }
.footer-admin a { font-size: .78rem; opacity: .7; }

/* ---------- error / 404 ---------- */
.err-page { text-align: center; padding: 12vh 20px; }
.err-page h1 { font-size: 4rem; color: var(--blue-700); margin: 0 0 10px; }
.err-page p { color: var(--muted); margin-bottom: 24px; }

.forum-card { max-width: 720px; margin: 0 auto; }
.forum-card p { font-size: .95rem; }