:root {
      --bg: #020617;
      --bg-elevated: #0f172a;
      --text: #f0f9ff;
      --text-muted: #94a3b8;
      --accent-cyan: #0ea5e9;
      --accent-blue: #3b82f6;
      --accent-warm: #f59e0b;
      --border: rgba(14, 165, 233, 0.08);
    }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    html, body { height: 100%; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      background: var(--bg);
      color: var(--text);
      overflow-x: hidden;
    }

    /* ── 左上角 LOGO + 知一（与前台首页一致，不炫亮） ── */
    .top-nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
      display: flex; align-items: center; justify-content: space-between;
      padding: 0 48px; height: 68px;
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(20px) saturate(1.4);
      border-bottom: 1px solid var(--border);
    }
    .nav-brand {
      display: flex; align-items: center; gap: 12px;
      font-size: 20px; font-weight: 800; letter-spacing: 2px;
      text-decoration: none;
      color: #f0f9ff;
      filter: drop-shadow(0 0 2px rgba(255, 255, 255, 0.06));
    }
    .nav-logo {
      width: 36px; height: 36px; flex-shrink: 0;
      transition: transform .35s ease;
    }
    .nav-brand:hover .nav-logo { transform: scale(1.06); }
    .nav-back {
      padding: 8px 20px; border-radius: 10px;
      border: 1px solid rgba(14, 165, 233, 0.35);
      background: rgba(14, 165, 233, 0.08);
      color: var(--accent-cyan); font-size: 13px; font-weight: 700;
      text-decoration: none; letter-spacing: .5px; transition: all .25s;
    }
    .nav-back:hover {
      background: rgba(14, 165, 233, 0.18);
      border-color: rgba(14, 165, 233, 0.6);
    }

    /* ── 全屏双栏布局 ── */
    .login-page {
      display: grid;
      grid-template-columns: 4fr 6fr;
      min-height: 100vh;
      padding-top: 68px;
      padding-bottom: 96px;
    }

    /* 左侧：活力品牌区 */
    .warm-section {
      position: relative;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 40px 48px 48px;
      overflow: hidden;
      background: radial-gradient(circle at 12% 88%, rgba(249, 115, 22, 0.14) 0%, transparent 52%),
                  radial-gradient(circle at 85% 12%, rgba(168, 85, 247, 0.12) 0%, transparent 55%),
                  radial-gradient(circle at 80% 80%, rgba(14, 165, 233, 0.05) 0%, transparent 50%),
                  var(--bg);
    }
    .warm-orb {
      position: absolute;
      border-radius: 50%;
      filter: blur(80px);
      pointer-events: none;
      animation: warmDrift 16s ease-in-out infinite;
    }
    .warm-orb-1 { width: 320px; height: 320px; background: rgba(245, 158, 11, 0.22); top: 12%; right: 4%; }
    .warm-orb-2 { width: 260px; height: 260px; background: rgba(236, 72, 153, 0.18); bottom: 16%; left: 8%; animation-delay: -6s; }
    .warm-orb-3 { width: 200px; height: 200px; background: rgba(139, 92, 246, 0.16); top: 52%; left: 48%; animation-delay: -11s; }
    @keyframes warmDrift {
      0%, 100% { transform: translate(0, 0) scale(1); }
      50% { transform: translate(22px, -24px) scale(1.08); }
    }

    .warm-content {
      position: relative;
      z-index: 1;
      max-width: 520px;
    }
    .warm-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 16px;
      border-radius: 999px;
      border: 1px solid rgba(251, 146, 60, 0.45);
      background: rgba(251, 146, 60, 0.10);
      color: #fdba74;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 2.5px;
      margin-bottom: 28px;
    }
    .warm-badge-dot {
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: #fb923c;
      box-shadow: 0 0 8px rgba(251, 146, 60, 0.9);
      animation: badgePulse 1.8s ease-in-out infinite;
    }
    @keyframes badgePulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(0.78); }
    }
    .warm-title {
      font-size: clamp(30px, 3.2vw, 40px);
      font-weight: 800;
      line-height: 1.3;
      letter-spacing: 1px;
      white-space: nowrap;
      margin-bottom: 18px;
      background: linear-gradient(92deg, #fbbf24, #fb923c 38%, #f472b6 72%, #c084fc);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }
    .warm-subtitle {
      font-size: 15px;
      line-height: 1.8;
      color: #cbd5e1;
      letter-spacing: .5px;
      margin-bottom: 40px;
    }
    .warm-lines {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .warm-line {
      display: flex;
      align-items: baseline;
      gap: 12px;
      font-size: 14px;
      line-height: 1.8;
      color: var(--text-muted);
      letter-spacing: .5px;
    }
    .warm-line strong {
      color: #fdba74;
      font-weight: 700;
      white-space: nowrap;
      margin-right: 10px;
    }
    .warm-line::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: radial-gradient(circle at 35% 35%, #fde68a, #f97316);
      box-shadow: 0 0 10px rgba(249, 115, 22, 0.7);
      flex-shrink: 0;
      transform: translateY(-1px);
    }
    .warm-bars {
      display: flex;
      align-items: flex-end;
      gap: 7px;
      height: 26px;
      margin-top: 40px;
    }
    .warm-bars span {
      width: 5px;
      border-radius: 3px;
      background: linear-gradient(180deg, #f472b6, #fb923c);
      transform-origin: bottom;
      animation: barBounce 1.6s ease-in-out infinite;
    }
    .warm-bars span:nth-child(1) { height: 40%; animation-delay: 0s; }
    .warm-bars span:nth-child(2) { height: 75%; animation-delay: 0.15s; }
    .warm-bars span:nth-child(3) { height: 100%; animation-delay: 0.3s; }
    .warm-bars span:nth-child(4) { height: 65%; animation-delay: 0.45s; }
    .warm-bars span:nth-child(5) { height: 45%; animation-delay: 0.6s; }
    @keyframes barBounce {
      0%, 100% { transform: scaleY(0.55); }
      50% { transform: scaleY(1); }
    }

    /* 右侧：登录模块 */
    .form-section {
      position: relative;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 48px 72px 56px;
      background: rgba(15, 23, 42, 0.6);
      backdrop-filter: blur(40px) saturate(1.2);
      border-left: 1px solid var(--border);
    }
    .form-section::before {
      content: "";
      position: absolute; top: 0; left: 0; right: 0; height: 1px;
      background: linear-gradient(90deg, transparent, rgba(14, 165, 233, 0.2), transparent);
    }
    .form-inner {
      position: relative;
      z-index: 1;
      width: 460px;
      margin: 0 auto;
    }
    .form-header {
      text-align: center;
      margin-bottom: 40px;
    }
    .form-header h1 {
      font-size: 40px; font-weight: 800; letter-spacing: 6px;
    }

    .field {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 22px;
    }
    .field label {
      flex: 0 0 60px;
      font-size: 14px; font-weight: 700;
      color: var(--text-muted);
      letter-spacing: 1px;
      text-align: right;
    }
    .field input {
      flex: 0 0 auto;
      width: 360px;
      min-width: 0;
      border: 1px solid rgba(14, 165, 233, 0.12);
      background: rgba(2, 6, 23, .45);
      color: var(--text); border-radius: 8px; padding: 0 16px;
      height: 40px; font-size: 15px; outline: none; transition: all .3s;
    }
    .field input:focus {
      border-color: rgba(14, 165, 233, 0.45);
      box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.12), inset 0 1px 0 rgba(255,255,255,0.04);
      background: rgba(2, 6, 23, .55);
    }
    .field input::placeholder { color: rgba(148, 163, 184, .4); }

    .login-btn {
      width: 360px; margin: 18px auto 0;
      padding: 0; border-radius: 8px;
      height: 40px;
      display: flex; align-items: center; justify-content: center;
      background: rgba(14, 165, 233, 0.12);
      border: 1px solid rgba(14, 165, 233, 0.4);
      color: #f0f9ff; font-size: 15px; font-weight: 700;
      cursor: pointer; letter-spacing: 3px;
      transition: all .45s cubic-bezier(0.23, 1, 0.32, 1);
    }
    .login-btn:hover {
      background: rgba(14, 165, 233, 0.22);
      border-color: rgba(14, 165, 233, 0.7);
      box-shadow: 0 0 36px rgba(14, 165, 233, 0.18);
      transform: translateY(-2px);
    }

    #message { min-height: 24px; margin: 20px 0 0; color: #eab308; text-align: center; font-size: 14px; }

    .captcha-field {
      margin: 0 0 14px;
    }
    .captcha-wrap {
      flex: 0 0 auto;
      display: flex;
      align-items: center;
      gap: 8px;
      width: 360px;
      min-width: 0;
    }
    .captcha-row {
      display: flex;
      align-items: center;
      gap: 4px;
      flex: 1 1 auto;
      min-width: 0;
    }
    .captcha-question,
    .captcha-refresh,
    #captchaAnswer {
      height: 40px;
      line-height: 38px;
      border: 1px solid rgba(14, 165, 233, 0.12);
      border-radius: 8px;
      font-size: 15px;
      box-sizing: border-box;
    }
    .captcha-question {
      color: var(--text);
      white-space: nowrap;
      background: rgba(2, 6, 23, .45);
      padding: 0 2px;
      font-size: 15px;
    }
    .captcha-refresh {
      flex-shrink: 0;
      padding: 0 12px;
      background: rgba(14, 165, 233, 0.1);
      border-color: rgba(14, 165, 233, 0.35);
      color: var(--text-soft);
      cursor: pointer;
      transition: all .2s;
    }
    .captcha-refresh:hover {
      background: rgba(14, 165, 233, 0.18);
      border-color: rgba(14, 165, 233, 0.55);
    }
    #captchaAnswer {
      flex: 0 0 auto;
      width: 90px;
      padding: 0 10px;
      text-align: center;
      background: rgba(2, 6, 23, .45);
      color: var(--text);
    }

    .site-footer {
      position: fixed; bottom: 0; left: 0; right: 0; z-index: 100;
      padding: 16px 24px;
      border-top: 1px solid var(--border);
      background: var(--record-footer-bg, #030712);
      backdrop-filter: blur(12px);
      text-align: center;
    }
    .site-footer p {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      flex-wrap: nowrap;
      color: var(--record-footer-color, #030712);
      font-size: 12px;
      letter-spacing: 0;
      margin: 0;
      max-width: 100%;
      overflow-x: auto;
      white-space: nowrap;
    }
    .site-footer a { color: var(--record-footer-color, #030712); text-decoration: none; }
    .site-footer a:hover { color: var(--record-footer-color, #030712); }
    .gongan-record {
      display: inline-flex; align-items: center; gap: 4px;
      color: inherit; text-decoration: none; font-size: inherit;
      flex: 0 0 auto; white-space: nowrap;
    }
    .gongan-record img { width: 14px; height: 14px; display: inline-block; flex: 0 0 auto; object-fit: contain; vertical-align: -2px; }
    .gongan-record .gongan-badge { width: 14px; height: 14px; display: inline-block; flex: 0 0 auto; vertical-align: -2px; background-color: var(--badge-color, currentColor); -webkit-mask: url("/static/gongan.png") no-repeat center / contain; mask: url("/static/gongan.png") no-repeat center / contain; }

    /* ── 响应式 ── */
    @media (max-width: 1024px) {
      .login-page { grid-template-columns: 1fr; }
      .warm-section {
        text-align: center;
        align-items: center;
        padding: 32px 32px 44px;
        min-height: auto;
      }
      .warm-lines { align-items: center; }
      .warm-line { justify-content: center; }
      .warm-bars { justify-content: center; }
      .form-section {
        border-left: none;
        border-top: 1px solid var(--border);
        padding: 40px 32px 48px;
        justify-content: center;
      }
    }
    @media (max-width: 640px) {
      .form-inner { width: 100%; max-width: 460px; padding: 0 16px; }
      .field { flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
      .field label { text-align: left; flex-basis: 100%; }
      .field input { width: 100%; }
      .captcha-wrap { width: 100%; justify-content: space-between; }
      .login-btn { width: 100%; margin-top: 14px; }
      .top-nav { padding: 0 20px; height: 60px; }
      .nav-brand { font-size: 18px; gap: 10px; }
      .nav-logo { width: 30px; height: 30px; }
      .login-page { padding-top: 60px; }
      .warm-section { padding: 20px 24px 32px; }
      .warm-title { font-size: 28px; }
      .warm-line { font-size: 14px; }
      .form-section { padding: 36px 24px 40px; justify-content: center; }
      .form-header { margin-bottom: 32px; }
      .form-header h1 { font-size: 24px; }
      .site-footer { padding: 12px 16px; }
    }