:root {
      --bg: #f7f7f8;
      --card: #ffffff;
      --text: #0f172a;
      --muted: #64748b;
      --primary: #111827;
      --ring: rgba(2,132,199,0.35);
      --border: #e5e7eb;
      /* Cambia esta URL por la foto que quieras mostrar a la izquierda */
      --side-photo: url('../img/cyber.png');
    }

    * { box-sizing: border-box; }
    html, body { height: 100%; }
    body {
      margin: 0;
      font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, 'Helvetica Neue', Arial, sans-serif;
      color: var(--text);
      background: linear-gradient(180deg, #fafafa, #f3f4f6);
    }

    /* NAVBAR */
    .navbar {
      position: sticky;
      top: 0;
      width: 100%;
      backdrop-filter: saturate(180%) blur(10px);
      background: rgba(255,255,255,0.7);
      border-bottom: 1px solid var(--border);
      z-index: 50;
    }
    .nav-inner {
      max-width: 1100px;
      margin: 0 auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 20px;
    }
    .brand {
      display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: inherit;
    }
    .brand-logo {
      width: 28px; height: 28px; border-radius: 8px; background: #111827; display: grid; place-items: center;
      color: white; font-size: 14px; font-weight: 700; letter-spacing: -0.02em;
    }
    .brand-name { font-weight: 700; letter-spacing: -0.01em; }
    .nav-links { display: flex; gap: 18px; }
    .nav-links a { color: var(--muted); text-decoration: none; font-size: 14px; }
    .nav-links a:hover { color: var(--text); }

    /* LAYOUT */
    .wrapper {
      max-width: 1100px;
      margin: 28px auto;
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 28px;
      padding: 0 20px;
    }

    /* LEFT PHOTO PANEL */
    .side-photo {
      position: relative;
      border-radius: 20px;
      overflow: hidden;
      min-height: 520px;
      background: #0b1220;
      box-shadow: 0 10px 30px rgba(0,0,0,0.08);
      isolation: isolate;
      
    }
    .side-photo::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: var(--side-photo);
      background-size: cover;
      background-position: center;
      filter: saturate(1) contrast(1.05);
      z-index: -1;
      transform: scale(1.02);
    }
    .side-overlay {
      position: absolute; inset: 0; background: linear-gradient(120deg, rgba(0,0,0,0.55), rgba(0,0,0,0.15));
    }
    .side-content {
      position: absolute; inset: 0; display: grid; place-items: end start; padding: 24px; color: white;
    }
    .side-badge {
      display: inline-flex; align-items: center; gap: 8px; padding: 6px 10px; border-radius: 9999px; background: rgba(255,255,255,0.1); font-size: 12px;
      backdrop-filter: blur(4px);
    }
    .side-title { margin-top: 10px; font-weight: 700; font-size: 28px; letter-spacing: -0.02em; }
    .side-sub { margin-top: 6px; color: rgba(255,255,255,0.85); font-size: 14px; max-width: 55ch; }

    /* CARD (LOGIN) */
    .card {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 20px;
      padding: 28px;
      align-self: center;
      box-shadow: 0 10px 30px rgba(2,6,23,0.05);
    }
    .card h1 {
      font-size: 28px; margin: 6px 0 6px; letter-spacing: -0.02em;
    }
    .card p { color: var(--muted); font-size: 14px; margin: 0 0 22px; }

    /* Google button */
    .btn-google {
      width: 100%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      border: 1px solid var(--border);
      background: white;
      padding: 12px 16px;
      border-radius: 12px;
      font-weight: 600;
      cursor: pointer;
      text-decoration: none;
      color: #111827;
      transition: transform .04s ease, box-shadow .15s ease, border-color .15s ease;
      box-shadow: 0 1px 0 rgba(17,24,39,0.04);
    }
    .btn-google:hover { border-color: #d1d5db; box-shadow: 0 8px 20px rgba(17,24,39,0.06); }
    .btn-google:active { transform: translateY(1px); }
    .g-icon { width: 20px; height: 20px; display: inline-block; }

    .divider { display: flex; align-items: center; gap: 12px; margin: 20px 0; color: var(--muted); font-size: 12px; }
    .divider::before, .divider::after { content: ""; height: 1px; background: var(--border); flex: 1; }

    .form-group { margin-bottom: 14px; }
    label { display: block; font-size: 13px; color: #111827; margin-bottom: 6px; }
    input[type="email"], input[type="password"] {
      width: 100%; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border); outline: none; font-size: 14px; background: white;
      transition: border-color .15s ease, box-shadow .15s ease;
    }
    input:focus { border-color: #93c5fd; box-shadow: 0 0 0 4px var(--ring); }

    .btn-primary {
      width: 100%;
      border: 0; background: #111827; color: white; padding: 12px 16px; border-radius: 12px; font-weight: 600; cursor: pointer;
      transition: transform .04s ease, box-shadow .15s ease, opacity .15s ease;
    }
    .btn-primary:hover { box-shadow: 0 10px 20px rgba(17,24,39,0.18); }
    .btn-primary:active { transform: translateY(1px); }

    .help { display: flex; justify-content: space-between; align-items: center; margin-top: 10px; font-size: 12px; color: var(--muted); }
    .help a { color: #111827; text-decoration: none; }
    .help a:hover { text-decoration: underline; }

    /* FOOTER */
    footer {
      margin: 30px auto 40px;
      max-width: 1100px;
      padding: 12px 20px;
      color: var(--muted);
      font-size: 12px;
      display: flex; align-items: center; justify-content: space-between;
      border-top: 1px solid var(--border);
    }
    .foot-links { display: flex; gap: 14px; }
    .foot-links a { color: var(--muted); text-decoration: none; }
    .foot-links a:hover { color: var(--text); }

    /* RESPONSIVE */
    @media (max-width: 980px) {
      .wrapper { grid-template-columns: 1fr; }
      .side-photo { min-height: 260px; }
    }