body { letter-spacing: -0.005em; }

    /* ═══════════════ LAYOUT SPLIT ═══════════════ */
    .shell {
      display: grid;
      grid-template-columns: 1.05fr 1fr;
      min-height: 100dvh;
    }

    /* ═══════════════ PANEL IZQUIERDO ═══════════════ */
    .pane-brand {
      position: relative;
      overflow: hidden;
      padding: 56px 64px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      background:
        radial-gradient(1200px 600px at 20% 110%, rgba(52,211,153,0.10), transparent 60%),
        radial-gradient(800px 500px at 90% -10%, rgba(34,197,94,0.06), transparent 55%),
        var(--bg-1);
      border-right: 1px solid var(--border-1);
    }

    /* Grid pattern decorativo */
    .pane-brand::before {
      content: '';
      position: absolute;
      inset: 0;
      background-image:
        linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
      background-size: 36px 36px;
      mask-image: radial-gradient(ellipse 100% 80% at 30% 50%, #000 30%, transparent 80%);
      -webkit-mask-image: radial-gradient(ellipse 100% 80% at 30% 50%, #000 30%, transparent 80%);
      pointer-events: none;
    }

    /* Marca SVG decorativa (líneas de cancha sutiles) */
    .pane-brand::after {
      content: '';
      position: absolute;
      right: -120px;
      bottom: -120px;
      width: 480px;
      height: 480px;
      border-radius: 50%;
      border: 1px solid rgba(52,211,153,0.12);
      box-shadow:
        inset 0 0 0 80px rgba(52,211,153,0.025),
        inset 0 0 0 160px transparent,
        inset 0 0 0 161px rgba(52,211,153,0.08);
      pointer-events: none;
    }

    .brand-row {
      display: flex;
      align-items: center;
      gap: 14px;
      position: relative;
      z-index: 1;
    }
    .brand-logo {
      width: 44px; height: 44px;
      object-fit: contain;
      border-radius: 10px;
      background: var(--bg-2);
      border: 1px solid var(--border-1);
      padding: 5px;
    }
    .brand-label {
      font-family: var(--font-mono);
      font-size: 10.5px;
      font-weight: 500;
      letter-spacing: 0.22em;
      text-transform: uppercase;
      color: var(--muted);
    }
    .brand-name {
      font-size: 15px;
      font-weight: 700;
      letter-spacing: -0.01em;
      color: var(--text);
      margin-top: 2px;
    }

    .hero {
      position: relative;
      z-index: 1;
      max-width: 460px;
    }
    .hero-eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 5px 12px;
      background: var(--accent-dim);
      border: 1px solid rgba(52,211,153,0.25);
      border-radius: 999px;
      font-family: var(--font-mono);
      font-size: 10.5px;
      font-weight: 600;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--accent);
      margin-bottom: 24px;
    }
    .hero-eyebrow .dot {
      width: 6px; height: 6px; border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 0 3px var(--accent-dim);
      animation: pulse 2.5s ease-in-out infinite;
    }
    @keyframes pulse {
      0%, 100% { box-shadow: 0 0 0 3px var(--accent-dim); }
      50%      { box-shadow: 0 0 0 5px rgba(52,211,153,0.05); }
    }

    .hero h1 {
      font-size: 38px;
      font-weight: 700;
      letter-spacing: -0.025em;
      line-height: 1.1;
      color: var(--text);
      margin-bottom: 16px;
    }
    .hero h1 span {
      color: var(--accent);
      font-style: italic;
      font-weight: 600;
    }
    .hero p {
      font-size: 15px;
      color: var(--text-2);
      line-height: 1.6;
      max-width: 440px;
    }

    .features {
      position: relative;
      z-index: 1;
      display: grid;
      gap: 14px;
      margin-top: 32px;
    }
    .feature {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 13.5px;
    }
    .feature-dot {
      flex-shrink: 0;
      width: 22px;
      height: 22px;
      border-radius: 6px;
      background: var(--bg-2);
      border: 1px solid var(--border-1);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
    }
    .feature-dot svg {
      width: 12px; height: 12px;
      stroke: currentColor;
      stroke-width: 2.5;
      fill: none;
      stroke-linecap: round;
      stroke-linejoin: round;
    }
    .feature-text { color: var(--text-2); padding-top: 1px; }
    .feature-text strong { color: var(--text); font-weight: 600; }

    .pane-foot {
      position: relative;
      z-index: 1;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      font-family: var(--font-mono);
      font-size: 11.5px;
      color: var(--muted);
    }
    .pane-foot .build {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 10px;
      background: var(--bg-2);
      border: 1px solid var(--border-1);
      border-radius: 999px;
    }
    .pane-foot .build::before {
      content: '';
      width: 6px; height: 6px;
      border-radius: 50%;
      background: var(--accent);
    }

    /* ═══════════════ PANEL DERECHO (FORM) ═══════════════ */
    .pane-form {
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 48px 56px;
      background: var(--bg-0);
      position: relative;
    }
    .form-wrap {
      width: 100%;
      max-width: 380px;
    }

    .form-head {
      margin-bottom: 32px;
    }
    .form-kicker {
      font-family: var(--font-mono);
      font-size: 10.5px;
      font-weight: 600;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--muted);
      margin-bottom: 8px;
    }
    .form-title {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--text);
      margin-bottom: 6px;
    }
    .form-sub {
      font-size: 13.5px;
      color: var(--text-2);
    }

    .back-link {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 24px;
      font-family: var(--font-mono);
      font-size: 11px;
      font-weight: 600;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--muted);
      text-decoration: none;
      padding: 8px 14px;
      border: 1px solid var(--border-1);
      border-radius: 8px;
      background: var(--bg-1);
      transition: all 0.15s ease;
    }
    .back-link:hover {
      color: var(--text);
      border-color: var(--border-2);
      background: var(--bg-2);
    }
    .back-link svg {
      width: 13px; height: 13px;
      stroke: currentColor;
      stroke-width: 2;
      fill: none;
      stroke-linecap: round;
      stroke-linejoin: round;
    }

    .err {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 11px 14px;
      background: var(--danger-dim);
      border: 1px solid rgba(244,63,94,0.28);
      border-radius: 8px;
      color: var(--danger);
      font-size: 12.5px;
      margin-bottom: 18px;
      animation: shake 0.4s cubic-bezier(.36,.07,.19,.97);
    }
    .err svg { width: 16px; height: 16px; stroke: currentColor; stroke-width: 2; fill: none; flex-shrink: 0; }
    @keyframes shake {
      10%, 90% { transform: translateX(-1px); }
      20%, 80% { transform: translateX(2px); }
      30%, 50%, 70% { transform: translateX(-3px); }
      40%, 60% { transform: translateX(3px); }
    }

    .field {
      margin-bottom: 14px;
    }
    .field label {
      display: block;
      font-family: var(--font-mono);
      font-size: 10.5px;
      font-weight: 600;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--muted);
      margin-bottom: 8px;
    }
    .input-wrap {
      position: relative;
      display: flex;
      align-items: center;
    }
    .input-wrap svg.icon {
      position: absolute;
      left: 14px;
      width: 15px;
      height: 15px;
      stroke: var(--muted);
      stroke-width: 2;
      fill: none;
      stroke-linecap: round;
      stroke-linejoin: round;
      pointer-events: none;
      transition: stroke 0.15s ease;
    }
    .input-wrap input {
      width: 100%;
      padding: 11px 14px 11px 40px;
      background: var(--bg-1);
      border: 1px solid var(--border-1);
      border-radius: 8px;
      color: var(--text);
      font-family: var(--font-sans);
      font-size: 13.5px;
      transition: all 0.15s ease;
      outline: none;
    }
    .input-wrap input::placeholder { color: var(--muted); }
    .input-wrap input:hover { border-color: var(--border-2); }
    .input-wrap input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px var(--accent-dim);
      background: var(--bg-1);
    }
    .input-wrap input:focus ~ svg.icon,
    .input-wrap:focus-within svg.icon { stroke: var(--accent); }

    /* Toggle ojo */
    .pw-toggle {
      position: absolute;
      right: 6px;
      width: 30px;
      height: 30px;
      background: transparent;
      border: none;
      border-radius: 6px;
      color: var(--muted);
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: color 0.15s ease, background 0.15s ease;
    }
    .pw-toggle:hover { color: var(--text); background: var(--bg-2); }
    .pw-toggle svg { width: 16px; height: 16px; stroke: currentColor; stroke-width: 2; fill: none; stroke-linecap: round; stroke-linejoin: round; }
    .pw-toggle .eye-off { display: none; }
    .pw-toggle.shown .eye-on  { display: none; }
    .pw-toggle.shown .eye-off { display: inline; }

    button[type=submit] {
      width: 100%;
      margin-top: 22px;
      padding: 12px 16px;
      background: var(--accent);
      color: var(--on-accent);
      font-family: var(--font-sans);
      font-size: 13.5px;
      font-weight: 700;
      letter-spacing: -0.005em;
      border: 1px solid var(--accent);
      border-radius: 8px;
      cursor: pointer;
      transition: all 0.15s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    button[type=submit]:hover {
      background: var(--accent-2);
      border-color: var(--accent-2);
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(52,211,153,0.16);
    }
    button[type=submit]:active { transform: translateY(0); }
    button[type=submit] svg { width: 14px; height: 14px; stroke: currentColor; stroke-width: 2.5; fill: none; stroke-linecap: round; stroke-linejoin: round; }

    .form-foot {
      margin-top: 28px;
      padding-top: 22px;
      border-top: 1px solid var(--border-1);
      font-family: var(--font-mono);
      font-size: 11px;
      color: var(--muted);
      text-align: center;
      letter-spacing: 0.04em;
    }
    .form-foot .lock {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .form-foot svg { width: 11px; height: 11px; stroke: currentColor; stroke-width: 2; fill: none; stroke-linecap: round; stroke-linejoin: round; }

    /* ═══════════════ ANIMACIÓN DE ENTRADA (izquierda → derecha) ═══════════════ */
    @keyframes slideInLeft {
      0%   { opacity: 0; transform: translateX(-48px); }
      100% { opacity: 1; transform: translateX(0); }
    }
    .pane-brand { animation: slideInLeft 0.7s cubic-bezier(.22,.61,.36,1) both; }
    .back-link  { animation: slideInLeft 0.6s cubic-bezier(.22,.61,.36,1) 0.12s both; }
    .form-head  { animation: slideInLeft 0.6s cubic-bezier(.22,.61,.36,1) 0.2s both; }
    .err        { animation: slideInLeft 0.5s cubic-bezier(.22,.61,.36,1) 0.24s both; }
    form        { animation: slideInLeft 0.6s cubic-bezier(.22,.61,.36,1) 0.28s both; }
    .form-foot  { animation: slideInLeft 0.6s cubic-bezier(.22,.61,.36,1) 0.4s both; }

    /* ═══════════════ RESPONSIVE ═══════════════ */
    @media (max-width: 960px) {
      body { overflow: auto; }
      .shell { grid-template-columns: 1fr; min-height: 100dvh; }
      .pane-brand {
        padding: 36px 28px 32px;
        border-right: none;
        border-bottom: 1px solid var(--border-1);
      }
      .pane-brand::after { display: none; }
      .hero h1 { font-size: 28px; }
      .features { margin-top: 22px; }
      .pane-foot { margin-top: 24px; }
      .pane-form { padding: 36px 28px 48px; }
    }

    @media (max-width: 480px) {
      .pane-brand { padding: 28px 20px 24px; }
      .pane-form { padding: 28px 20px 40px; }
      .hero h1 { font-size: 24px; }
      .hero p { font-size: 13.5px; }
    }