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

    :root {
      /* Login — verde */
      --login-accent:  #22c55e;
      --login-accent2: #16a34a;
      --login-glow:    rgba(34,197,94,0.18);
      --login-glow2:   rgba(34,197,94,0.08);
      --login-border:  rgba(34,197,94,0.35);

      /* Signin — azul */
      --signin-accent:  #3b82f6;
      --signin-accent2: #2563eb;
      --signin-glow:    rgba(59,130,246,0.18);
      --signin-glow2:   rgba(59,130,246,0.08);
      --signin-border:  rgba(59,130,246,0.35);

      /* Base */
      --bg:    #07090f;
      --s1:    #0d1017;
      --s2:    #111520;
      --s3:    #161b28;
      --b0:    rgba(255,255,255,0.04);
      --b1:    rgba(255,255,255,0.08);
      --b2:    rgba(255,255,255,0.14);
      --txt:   #e8eaf0;
      --txt2:  #7a7e90;
      --txt3:  #3a3e50;
      --err:   #f87171;
      --err-d: rgba(248,113,113,0.10);
      --mono:  'IBM Plex Mono', monospace;
      --sans:  'Space Grotesk', sans-serif;

      --accent:  var(--login-accent);
      --accent2: var(--login-accent2);
      --glow:    var(--login-glow);
      --glow2:   var(--login-glow2);
      --aborder: var(--login-border);
    }

    body {
      background: var(--bg);
      color: var(--txt);
      font-family: var(--sans);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow-x: hidden;
    }

    /* ── Fondo con malla ── */
    body::before {
      content: '';
      position: fixed;
      inset: 0;
      background:
        radial-gradient(ellipse 60% 50% at 20% 30%, rgba(34,197,94,0.06) 0%, transparent 65%),
        radial-gradient(ellipse 50% 60% at 80% 70%, rgba(59,130,246,0.06) 0%, transparent 65%);
      pointer-events: none;
      z-index: 0;
      transition: background 0.5s ease;
    }

    body.mode-signin::before {
      background:
        radial-gradient(ellipse 60% 50% at 20% 30%, rgba(59,130,246,0.06) 0%, transparent 65%),
        radial-gradient(ellipse 50% 60% at 80% 70%, rgba(34,197,94,0.04) 0%, transparent 65%);
    }

    /* Grid decorativo */
    body::after {
      content: '';
      position: fixed;
      inset: 0;
      background-image:
        linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 0;
    }

    /* ── Header ── */
    .site-header {
      position: fixed;
      top: 0; left: 0; right: 0;
      height: 44px;
      display: flex;
      align-items: center;
      padding: 0 20px;
      border-bottom: 1px solid var(--b0);
      background: rgba(7,9,15,0.8);
      backdrop-filter: blur(16px);
      z-index: 10;
    }

    .logo {
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 4px;
      text-transform: uppercase;
      color: var(--accent);
      transition: color 0.4s;
    }

    .header-tag {
      margin-left: auto;
      font-family: var(--mono);
      font-size: 9px;
      color: var(--txt3);
      letter-spacing: 1.5px;
    }

    /* ── Wrapper principal ── */
    .wrapper {
      position: relative;
      z-index: 1;
      width: 100%;
      max-width: 420px;
      padding: 20px 16px;
    }

    /* ── Tabs de modo ── */
    .mode-tabs {
      display: flex;
      border: 1px solid var(--b1);
      border-radius: 8px;
      overflow: hidden;
      margin-bottom: 28px;
      background: var(--s1);
    }

    .mode-tab {
      flex: 1;
      padding: 11px 0;
      border: none;
      background: transparent;
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 2px;
      text-transform: uppercase;
      cursor: pointer;
      color: var(--txt2);
      transition: all 0.25s ease;
      position: relative;
    }

    .mode-tab::after {
      content: '';
      position: absolute;
      bottom: 0; left: 0; right: 0;
      height: 2px;
      background: transparent;
      transition: background 0.25s ease;
    }

    .mode-tab.active-login {
      color: var(--login-accent);
      background: var(--login-glow2);
    }
    .mode-tab.active-login::after { background: var(--login-accent); }

    .mode-tab.active-signin {
      color: var(--signin-accent);
      background: var(--signin-glow2);
    }
    .mode-tab.active-signin::after { background: var(--signin-accent); }

    /* ── Card ── */
    .card {
      background: var(--s1);
      border: 1px solid var(--b1);
      border-radius: 14px;
      padding: 32px 28px 28px;
      position: relative;
      overflow: hidden;
    }

    .card::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0;
      height: 1px;
      background: linear-gradient(90deg, transparent, var(--accent), transparent);
      opacity: 0.6;
      transition: background 0.4s;
    }

    /* Título */
    .card-title {
      font-size: 22px;
      font-weight: 600;
      letter-spacing: -0.5px;
      margin-bottom: 4px;
      color: var(--txt);
    }

    .card-sub {
      font-family: var(--mono);
      font-size: 10px;
      color: var(--txt3);
      letter-spacing: 1.5px;
      text-transform: uppercase;
      margin-bottom: 28px;
    }

    /* ── Campos ── */
    .field {
      margin-bottom: 16px;
    }

    .field label {
      display: block;
      font-family: var(--mono);
      font-size: 9px;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      color: var(--txt2);
      margin-bottom: 7px;
    }

    .field-wrap {
      position: relative;
    }

    .field-icon {
      position: absolute;
      left: 12px;
      top: 50%;
      transform: translateY(-50%);
      font-size: 14px;
      opacity: 0.4;
      pointer-events: none;
      transition: opacity 0.2s;
    }

    .field input {
      width: 100%;
      height: 44px;
      background: var(--s3);
      border: 1px solid var(--b1);
      border-radius: 8px;
      color: var(--txt);
      font-family: var(--sans);
      font-size: 14px;
      padding: 0 12px 0 38px;
      outline: none;
      transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
    }

    .field input:focus {
      border-color: var(--accent);
      background: rgba(255,255,255,0.03);
      box-shadow: 0 0 0 3px var(--glow2);
    }

    .field input:focus + .field-icon,
    .field-wrap:focus-within .field-icon {
      opacity: 0.7;
    }

    .field input.error {
      border-color: var(--err);
      box-shadow: 0 0 0 3px var(--err-d);
    }

    .field-error {
      font-family: var(--mono);
      font-size: 9px;
      color: var(--err);
      margin-top: 5px;
      letter-spacing: 0.3px;
      display: none;
    }

    .field-error.show { display: block; }

    /* ── Botón principal ── */
    .btn-main {
      width: 100%;
      height: 46px;
      border: none;
      border-radius: 8px;
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 2px;
      text-transform: uppercase;
      cursor: pointer;
      margin-top: 8px;
      position: relative;
      overflow: hidden;
      transition: transform 0.15s, box-shadow 0.2s;
    }

    .btn-main::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(255,255,255,0.08);
      opacity: 0;
      transition: opacity 0.15s;
    }

    .btn-main:hover::before { opacity: 1; }
    .btn-main:hover { transform: translateY(-1px); }
    .btn-main:active { transform: translateY(0); }

    .btn-login {
      background: linear-gradient(135deg, var(--login-accent), var(--login-accent2));
      color: #000;
      box-shadow: 0 4px 20px rgba(34,197,94,0.25);
    }

    .btn-signin {
      background: linear-gradient(135deg, var(--signin-accent), var(--signin-accent2));
      color: #fff;
      box-shadow: 0 4px 20px rgba(59,130,246,0.25);
    }

    .btn-main:hover.btn-login { box-shadow: 0 6px 28px rgba(34,197,94,0.35); }
    .btn-main:hover.btn-signin { box-shadow: 0 6px 28px rgba(59,130,246,0.35); }

    /* Spinner dentro del botón */
    .btn-spinner {
      display: none;
      width: 16px; height: 16px;
      border: 2px solid rgba(255,255,255,0.3);
      border-top-color: currentColor;
      border-radius: 50%;
      animation: spin 0.6s linear infinite;
      margin: 0 auto;
    }

    .btn-main.loading .btn-text { display: none; }
    .btn-main.loading .btn-spinner { display: block; }

    @keyframes spin { to { transform: rotate(360deg); } }

    /* ── Restablecer contraseña ── */
    .restore-link {
      display: block;
      text-align: center;
      margin-top: 16px;
      font-family: var(--mono);
      font-size: 10px;
      color: var(--txt3);
      text-decoration: none;
      letter-spacing: 0.5px;
      cursor: pointer;
      transition: color 0.2s;
      background: none;
      border: none;
      width: 100%;
    }

    .restore-link:hover { color: var(--login-accent); }

    /* ── Divider ── */
    .divider {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 20px 0;
    }
    .divider::before, .divider::after {
      content: ''; flex: 1;
      height: 1px;
      background: var(--b1);
    }
    .divider span {
      font-family: var(--mono);
      font-size: 9px;
      color: var(--txt3);
      letter-spacing: 1px;
    }

    /* ── Toast de estado ── */
    .toast {
      position: fixed;
      top: 60px; left: 50%;
      transform: translateX(-50%) translateY(-8px);
      background: var(--s2);
      border: 1px solid var(--b1);
      border-radius: 8px;
      padding: 10px 18px;
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 0.5px;
      z-index: 100;
      opacity: 0;
      transition: opacity 0.25s, transform 0.25s;
      pointer-events: none;
      white-space: nowrap;
      max-width: 90vw;
    }
    .toast.show {
      opacity: 1;
      transform: translateX(-50%) translateY(0);
    }
    .toast.success { color: var(--login-accent); border-color: var(--login-border); }
    .toast.error   { color: var(--err);          border-color: rgba(248,113,113,0.35); }

    /* ── Modal restablecimiento ── */
    .modal-overlay {
      position: fixed;
      inset: 0;
      background: rgba(7,9,15,0.85);
      backdrop-filter: blur(8px);
      z-index: 50;
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.25s;
      padding: 20px;
    }
    .modal-overlay.open {
      opacity: 1;
      pointer-events: all;
    }
    .modal {
      background: var(--s1);
      border: 1px solid var(--b2);
      border-radius: 14px;
      padding: 28px 24px;
      width: 100%;
      max-width: 360px;
      position: relative;
      transform: scale(0.96);
      transition: transform 0.25s;
    }
    .modal-overlay.open .modal { transform: scale(1); }

    .modal-title {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 6px;
    }
    .modal-sub {
      font-family: var(--mono);
      font-size: 9px;
      color: var(--txt3);
      letter-spacing: 1px;
      text-transform: uppercase;
      margin-bottom: 22px;
    }
    .modal-close {
      position: absolute;
      top: 16px; right: 16px;
      width: 28px; height: 28px;
      border: 1px solid var(--b1);
      border-radius: 6px;
      background: transparent;
      color: var(--txt2);
      font-size: 14px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.15s;
    }
    .modal-close:hover { border-color: var(--err); color: var(--err); }

    .btn-restore {
      width: 100%;
      height: 42px;
      border: none;
      border-radius: 8px;
      background: linear-gradient(135deg, var(--login-accent), var(--login-accent2));
      color: #000;
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 2px;
      text-transform: uppercase;
      cursor: pointer;
      margin-top: 8px;
      transition: opacity 0.2s, transform 0.15s;
    }
    .btn-restore:hover { opacity: 0.9; transform: translateY(-1px); }

    /* Paneles de formulario con transición */
    .form-panel {
      display: none;
    }
    .form-panel.active {
      display: block;
      animation: fadeIn 0.3s ease;
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(6px); }
      to   { opacity: 1; transform: translateY(0); }
    }

    /* Transición de acento */
    .logo, .card::before, .field input:focus,
    .mode-tab, .restore-link {
      transition: all 0.35s ease;
    }

    /* Responsive */
    @media (max-width: 480px) {
      .card { padding: 24px 18px 20px; }
      .wrapper { padding: 16px 12px; }
    }