:root {
  --bg-start: #f2f6fb;
  --bg-end: #e5eef8;
  --card-bg: #ffffff;
  --text-main: #1f2d3d;
  --text-muted: #5b6b7d;
  --accent: #1f6fd4;
  --accent-hover: #165bb0;
  --border: #d8e1eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(145deg, var(--bg-start), var(--bg-end));
  color: var(--text-main);
  min-height: 100vh;
}

.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
}

.login-card {
  width: 100%;
  max-width: 420px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 12px 30px rgba(31, 45, 61, 0.12);
  padding: 2rem;
}

.card-header {
  margin-bottom: 1.5rem;
}

.brand-logo {
  width: 320px;
  height: auto;
  max-width: 100%;
  object-fit: contain;
  display: block;
  margin-bottom: 0.7rem;
}

.brand {
  margin: 0;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.02em;
}

h1 {
  margin: 0.35rem 0 0.4rem;
  font-size: 1.7rem;
}

.subtitle {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.login-form {
  display: grid;
  gap: 0.9rem;
}

.error-message {
  margin: 0;
  border: 1px solid #f1c3c8;
  background: #fff3f5;
  color: #9d1f2d;
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  font-size: 0.9rem;
}

label {
  font-size: 0.9rem;
  font-weight: 600;
}

input[type="text"],
input[type="email"],
input[type="password"] {
  width: 100%;
  padding: 0.75rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
  font-size: 0.95rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(31, 111, 212, 0.18);
}

.form-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 0.2rem;
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 500;
  color: var(--text-muted);
}

input[type="checkbox"] {
  accent-color: var(--accent);
}

.link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
}

.link:hover {
  text-decoration: underline;
}

button {
  margin-top: 0.35rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  padding: 0.8rem 1rem;
  font-size: 0.98rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

button:hover {
  background: var(--accent-hover);
}

@media (max-width: 480px) {
  .login-card {
    padding: 1.5rem;
  }

  .form-row {
    flex-direction: column;
    align-items: flex-start;
  }
}