/* 智研 Zhiyan — 站点布局：顶部导航、页尾、通用卡片 */

/* ========== 顶部导航 ========== */
.site-nav {
  background: var(--surface);
  color: var(--inverse);
  border-bottom: 1px solid rgba(255, 255, 255, .06);
  position: sticky; top: 0; z-index: 50;
}
.nav-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; gap: 28px;
  padding: 0 28px; height: 58px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  color: #fff; font-weight: 700; font-size: 18px;
  letter-spacing: .04em;
}
.nav-logo:hover { text-decoration: none; }
.nav-logo svg { width: 26px; height: 26px; }
.nav-logo .en { font-size: 11px; letter-spacing: .18em; color: var(--accent); font-weight: 500; }
.nav-links { display: flex; gap: 4px; flex: 1; }
.nav-links a {
  color: #cbd5e1;
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 14px;
  transition: background .15s, color .15s;
}
.nav-links a:hover { color: #fff; background: rgba(255, 255, 255, .06); text-decoration: none; }
.nav-links a.active {
  color: #fff;
  background: rgba(255, 255, 255, .1);
  box-shadow: inset 0 -2px 0 var(--accent);
}
.nav-cta {
  background: var(--accent); color: #fff;
  padding: 8px 16px; border-radius: 6px;
  font-size: 13px; font-weight: 600; letter-spacing: .04em;
  transition: filter .15s;
}
.nav-cta:hover { filter: brightness(1.08); text-decoration: none; }
.nav-theme {
  background: transparent; border: 1px solid rgba(255, 255, 255, .15);
  color: #cbd5e1; border-radius: 6px; padding: 6px 10px;
  font-size: 14px; line-height: 1; cursor: pointer;
  transition: background .15s, color .15s;
}
.nav-theme:hover { background: rgba(255, 255, 255, .08); color: #fff; }

/* ========== 主内容 ========== */
.site-main { min-height: calc(100vh - 58px - 160px); }

.container {
  max-width: 1280px; margin: 0 auto; padding: 0 28px;
}
.container-narrow { max-width: 960px; }

/* ========== 页尾 ========== */
.site-footer {
  background: var(--surface);
  color: #cbd5e1;
  padding: 36px 28px 28px;
  margin-top: 48px;
  border-top: 1px solid rgba(255, 255, 255, .06);
}
.site-footer a { color: #cbd5e1; }
.site-footer a:hover { color: var(--accent); }
.footer-inner {
  max-width: 1280px; margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
}
.footer-inner h5 {
  margin: 0 0 10px; color: #fff; font-size: 12px;
  letter-spacing: .12em; text-transform: uppercase; font-weight: 600;
}
.footer-inner p, .footer-inner li {
  font-size: 13px; color: #94a3b8;
}
.footer-inner ul { list-style: none; padding: 0; margin: 0; }
.footer-inner li { margin: 4px 0; }
.footer-bottom {
  max-width: 1280px; margin: 24px auto 0; padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, .08);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  font-size: 12px; color: #64748b;
}
.brand-name { color: #fff; font-weight: 700; letter-spacing: .04em; }

/* ========== 通用卡片 / 面板 ========== */
.panel {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px 26px;
  margin-bottom: 16px; box-shadow: var(--shadow-card);
}
.panel h2 {
  margin: 0 0 14px; padding-left: 10px;
  border-left: 4px solid var(--brand);
  font-size: 18px;
}

/* ========== 表单控件 ========== */
.form-label {
  display: block; font-size: 12px; color: var(--muted);
  margin: 14px 0 6px; font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase;
}
.form-input,
input[type=text].form-input,
input[type=date].form-input {
  width: 100%; padding: 10px 12px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  font-size: 14px; font-family: inherit;
  background: var(--paper-soft);
  transition: border-color .15s, background .15s;
}
.form-input:focus { outline: none; border-color: var(--brand); background: var(--paper); }

.btn {
  display: inline-block; padding: 10px 20px;
  border: none; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: filter .15s, transform .05s;
  font-family: inherit;
}
.btn:hover { filter: brightness(1.06); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .55; cursor: not-allowed; filter: none; }
.btn-brand { background: var(--brand); color: #fff; }
.btn-accent { background: var(--accent); color: #fff; }
.btn-ghost { background: transparent; color: var(--brand); border: 1px solid var(--brand); }

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px; border: 1px solid var(--line); border-radius: 20px;
  font-size: 13px; cursor: pointer; user-select: none;
  background: var(--paper-soft);
  transition: all .15s;
}
.chip input { margin: 0; }
.chip.selected { border-color: var(--brand); color: var(--brand); background: var(--brand-soft); }

/* ========== 数据单元格 ========== */
.cell-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
}
.cell {
  background: var(--paper-soft); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 10px 12px;
}
.cell .k { font-size: 11px; color: var(--muted); letter-spacing: .08em; text-transform: uppercase; }
.cell .v { font-size: 15px; font-weight: 700; color: var(--brand); margin-top: 4px; font-family: var(--mono); }

/* ========== 响应式 ========== */
@media (max-width: 900px) {
  .nav-inner { gap: 14px; padding: 0 16px; }
  .nav-links { display: none; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .container { padding: 0 16px; }
  .panel { padding: 18px; }
}