:root {
  --bg: #f9fafb;
  --card-bg: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #d1d5db;
  --brand-1: #0F52BA;
  --brand-2: #38BDF8;
  --error-bg: #fee2e2;
  --error-text: #b91c1c;

  --radius-lg: 1.5rem;
  --radius-md: .625rem;
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.05);

  --space-1: .5rem;
  --space-2: .75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 2.5rem;
}

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

html,
body {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font-family: 'Pretendard', -apple-system, system-ui, 'Segoe UI', Roboto, 'Noto Sans KR', sans-serif;
  line-height: 1.5;
  display: grid;
  place-items: center;
}

#login-logo {
  display: block;
  margin: 0 auto var(--space-4);
  max-width: 10rem;
  height: auto;
}

.login-wrapper {
  width: 100%;
  max-width: 22.5rem;
  padding: 0 var(--space-3);
}

.login-box,
.login-form {
  width: 100%;
  padding: var(--space-6) var(--space-5);
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.login-wrapper h1.logo {
  text-align: center;
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.login-box input,
.login-form input {
  width: 100%;
  padding: .875rem 1.125rem;
  margin-bottom: var(--space-3);
  font-size: .9375rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #f9fafb;
  transition: border-color .2s ease, box-shadow .2s ease;
}

.login-box input:focus,
.login-form input:focus {
  border-color: var(--brand-1);
  outline: 0;
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.25);
}

.login-box input:focus-visible,
.login-form input:focus-visible {
  border-color: var(--brand-1);
  outline: 0;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand-2) 25%, transparent);
}

.login-box button:disabled,
.login-form button:disabled {
  opacity: .6;
  cursor: not-allowed;
  filter: none;
  transform: none;
}

.login-form input[type="checkbox"] {
  width: auto;
  margin: 0;
}

.login-box button,
.login-form button {
  width: 100%;
  padding: .875rem;
  margin-top: .5rem;
  border: 0;
  border-radius: 9999px;
  background: linear-gradient(90deg, var(--brand-1), var(--brand-2));
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: filter .2s ease, transform .02s ease-in-out;
}

.login-box button:hover,
.login-form button:hover {
  filter: brightness(1.03);
}

.login-box button:active,
.login-form button:active {
  transform: translateY(1px);
}

.error-message {
  background: var(--error-bg);
  color: var(--error-text);
  padding: .625rem .875rem;
  margin-bottom: var(--space-3);
  border-radius: .375rem;
  font-size: .875rem;
  text-align: left;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.remember-row {
  display: inline-flex;
  align-items: center;
  gap: .375rem;
  margin: .625rem 0;
}

#installBanner,
#iosInstallBanner {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  background: #fff;
  border: 1px solid #e5e7eb;
  padding: 1rem 1.25rem;
  border-radius: 1rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, .06);
  z-index: 1000;
}

#iosInstallBanner {
  left: 1rem;
  right: 1rem;
}

#installBanner h3 {
  margin: 0 0 .5rem 0;
  font-size: 1rem;
  font-weight: 700;
}

#installBanner button,
#iosInstallBanner button {
  background-color: #0F52BA;
  color: #fff;
  padding: .5rem 1rem;
  border: 0;
  border-radius: .5rem;
  font-size: .9rem;
  cursor: pointer;
}

#installBanner button:hover,
#iosInstallBanner button:hover {
  filter: brightness(1.03);
}

@media (max-width: 480px) {
  .login-wrapper {
    padding: var(--space-2);
  }

  .login-box,
  .login-form {
    padding: var(--space-5) var(--space-4);
    border-radius: 1.25rem;
  }

  .login-box input,
  .login-form input,
  .login-box button,
  .login-form button {
    padding: .75rem;
    font-size: .875rem;
  }

  .error-message {
    font-size: .8125rem;
    padding: .5rem .75rem;
  }
}

.login-form input[type="password"] {
  margin-bottom: var(--space-2);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b121a;
    --card-bg: #0f172a;
    --text: #e5e7eb;
    --border: #2a3342;
    --error-bg: #7f1d1d;
    --error-text: #fee2e2;
  }

  .login-box input,
  .login-form input {
    background: #0b1320;
    color: var(--text);
    border-color: #2a3342;
  }

  .login-box button,
  .login-form button {
    background: linear-gradient(90deg,
        color-mix(in srgb, var(--brand-1) 85%, black),
        color-mix(in srgb, var(--brand-2) 85%, black));
  }
}