*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    :root {
      --white: #ffffff;
      --gray-light: #aaa;
      --gray-mid: #555;
      --bg-dark: #111;
      --bg-card: rgba(255,255,255,0.04);
      --border: rgba(255,255,255,0.12);
      --border-hover: rgba(255,255,255,0.35);
      --accent: #fff;
    }

    html { scroll-behavior: smooth; }

    body {
      background: linear-gradient(to bottom, #111, #1e1e1e);
      min-height: 100vh;
      font-family: 'DM Sans', sans-serif;
      color: var(--white);
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }

    .top-line {
      position: fixed;
      top: 0; left: 0; right: 0;
      height: 3px;
      background: var(--white);
      z-index: 100;
    }

    .bg-keys {
      position: fixed;
      bottom: 0; left: 0; right: 0;
      height: 180px;
      display: flex;
      align-items: flex-end;
      justify-content: center;
      gap: 3px;
      padding: 0 20px;
      opacity: 0.04;
      pointer-events: none;
      z-index: 0;
    }
    .bg-key {
      background: white;
      border-radius: 4px 4px 6px 6px;
      flex: 1;
      max-width: 48px;
    }
    .bg-key:nth-child(odd)  { height: 160px; }
    .bg-key:nth-child(even) { height: 140px; }
    .bg-key:nth-child(3n)   { height: 180px; }

    .login-wrap {
      position: relative;
      z-index: 10;
      width: 100%;
      max-width: 420px;
      padding: 20px;
      animation: fadeUp 0.7s cubic-bezier(0.22,1,0.36,1) both;
    }

    .logo {
      text-align: center;
      margin-bottom: 48px;
    }
    .logo-tag {
      font-size: 11px;
      letter-spacing: 5px;
      text-transform: uppercase;
      color: var(--gray-light);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
    }
    .logo-tag::before, .logo-tag::after {
      content: '';
      display: inline-block;
      width: 24px;
      height: 1px;
      background: var(--gray-mid);
    }
    .logo h1 {
      font-family: 'Bebas Neue', sans-serif;
      font-size: 56px;
      letter-spacing: 10px;
      line-height: 1;
      color: var(--white);
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 36px 32px;
      transition: border-color 0.2s;
    }
    .card:hover { border-color: rgba(255,255,255,0.18); }

    .tabs {
      display: flex;
      margin-bottom: 36px;
      border-bottom: 1px solid var(--border);
    }
    .tab {
      flex: 1;
      background: none;
      border: none;
      color: var(--gray-mid);
      font-family: 'Bebas Neue', sans-serif;
      font-size: 16px;
      letter-spacing: 4px;
      text-transform: uppercase;
      padding: 12px 0;
      cursor: pointer;
      transition: color 0.2s;
      position: relative;
    }
    .tab::after {
      content: '';
      position: absolute;
      bottom: -1px; left: 0; right: 0;
      height: 2px;
      background: var(--white);
      transform: scaleX(0);
      transition: transform 0.25s ease;
    }
    .tab.active { color: var(--white); }
    .tab.active::after { transform: scaleX(1); }

    .form-section { display: none; }
    .form-section.active { display: block; animation: fadeUp 0.3s ease; }

    .field { margin-bottom: 20px; }
    .field label {
      display: block;
      font-size: 10px;
      letter-spacing: 4px;
      text-transform: uppercase;
      color: var(--gray-light);
      margin-bottom: 10px;
      font-weight: 500;
    }
    .field input {
      width: 100%;
      padding: 13px 16px;
      background: rgba(255,255,255,0.04);
      border: 1px solid var(--border);
      border-radius: 8px;
      color: var(--white);
      font-family: 'DM Sans', sans-serif;
      font-size: 14px;
      font-weight: 300;
      outline: none;
      transition: border-color 0.2s, background 0.2s;
    }
    .field input:focus {
      border-color: var(--border-hover);
      background: rgba(255,255,255,0.06);
    }
    .field input::placeholder { color: var(--gray-mid); }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      width: 100%;
      background: var(--white);
      color: #111;
      border: none;
      font-family: 'Bebas Neue', sans-serif;
      font-size: 16px;
      letter-spacing: 5px;
      text-transform: uppercase;
      padding: 16px 40px;
      border-radius: 8px;
      cursor: pointer;
      transition: opacity 0.2s, transform 0.2s;
      margin-top: 8px;
    }
    .btn-primary:hover { opacity: 0.88; transform: translateY(-2px); }
    .btn-primary:active { transform: translateY(0); opacity: 1; }

    .note {
      text-align: center;
      font-size: 12px;
      color: var(--gray-mid);
      margin-top: 20px;
      letter-spacing: 1px;
      font-weight: 300;
    }
    .note span {
      color: var(--gray-light);
      cursor: pointer;
      text-decoration: underline;
      text-underline-offset: 3px;
    }
    .note span:hover { color: var(--white); }

    .toast {
      position: fixed;
      bottom: 32px;
      left: 50%;
      transform: translateX(-50%) translateY(80px);
      background: rgba(17,17,17,0.96);
      border: 1px solid var(--border);
      color: var(--white);
      padding: 12px 24px;
      border-radius: 8px;
      font-size: 11px;
      letter-spacing: 3px;
      text-transform: uppercase;
      transition: transform 0.3s ease;
      z-index: 200;
      white-space: nowrap;
      pointer-events: none;
    }
    .toast.show { transform: translateX(-50%) translateY(0); }
    .toast.error { border-color: rgba(255,80,80,0.35); color: rgba(255,130,130,0.9); }

    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(24px); }
      to   { opacity: 1; transform: translateY(0); }
    }

    @media (max-width: 480px) {
      .card { padding: 28px 20px; }
      .logo h1 { font-size: 42px; }
    }