:root {
      --bg: #f7f5f2;
      --ink: #1a1a1a;
      --muted: #888;
      --accent: #2d6a4f;
      --accent-light: #d8f3dc;
      --border: #e0ddd8;
      --card-bg: #ffffff;
    }

    body.dark {
      --bg: #212428;
      --ink: #fcfdff;
      --muted: #f8f8f8;
      --accent: #22c55e;
      --accent-light: #241f1f;
      --border: #0f1011;
      --card-bg: #19191a;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'DM Sans', sans-serif;
    }

    body {
      min-height: 100vh;
      background: var(--bg);
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 20px;
      transition: background 0.2s, color 0.2s;
    }

    .theme-toggle {
      position: fixed;
      top: 20px;
      right: 20px;
      background: var(--card-bg);
      border: 1px solid var(--border);
      border-radius: 40px;
      padding: 8px 16px;
      cursor: pointer;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--ink);
      transition: all 0.2s;
      z-index: 100;
    }

    .card {
      background: var(--card-bg);
      border: 1px solid var(--border);
      border-radius: 24px;
      width: 100%;
      max-width: 420px;
      padding: 32px;
      box-shadow: 0 12px 32px rgba(0,0,0,0.05);
    }

    h2 {
      font-family: 'DM Serif Display', serif;
      font-size: 1.8rem;
      text-align: center;
      margin-bottom: 28px;
      color: var(--ink);
    }

    .input-group {
      position: relative;
      margin-bottom: 20px;
    }

    .input-group i {
      position: absolute;
      left: 16px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--muted);
    }

    input {
      width: 100%;
      padding: 14px 16px 14px 44px;
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: 12px;
      font-size: 14px;
      color: var(--ink);
    }

    input:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(45,106,79,0.1);
    }

    button {
      width: 100%;
      padding: 12px;
      border-radius: 40px;
      border: none;
      background: var(--ink);
      color: var(--bg);
      font-weight: 600;
      cursor: pointer;
      transition: 0.2s;
    }

    button:hover {
      transform: translateY(-1px);
    }

    .link {
      text-align: center;
      margin-top: 20px;
      font-size: 14px;
      color: var(--muted);
    }

    .link a {
      color: var(--accent);
      text-decoration: none;
      font-weight: 500;
    }