*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --border-strong: #dccdbb;
  --shadow-login: 0 24px 60px rgba(17, 17, 17, 0.12);
  --shadow-login-soft: 0 12px 30px rgba(17, 17, 17, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --border-strong: #3a342e;
    --shadow-login: 0 24px 60px rgba(0, 0, 0, 0.4);
    --shadow-login-soft: 0 12px 30px rgba(0, 0, 0, 0.3);
  }
}

html, body { min-height: 100%; }

body {
  min-height: 100vh;  
  display: grid;
  place-items: center;
  padding: 2rem 1.125rem;
  background:
    radial-gradient(circle at top left, rgba(var(--accent-rgb), 0.07), transparent 18%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-elevated) 100%);
  color: var(--text);
  font-family: var(--font-sans);
  font-weight: var(--font-sans-weight);
  overflow-x: hidden;
  position: relative;
}

.cracks-filter {
  position: absolute;
  width: 0;
  height: 0;
}

.cracked-earth {
  position: fixed;
  inset: 0;
  background-color: var(--accent);
  filter: url(#cracks);
  opacity: 0.1;
  pointer-events: none;
  z-index: 0;
}

.card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 29.375rem;
  padding: 2rem 2rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: 1.5rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 250, 244, 0.94) 100%);
  box-shadow: var(--shadow-login);
  backdrop-filter: blur(14px);
  animation: fadeUp 0.45s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(1.125rem); }
  to   { opacity: 1; transform: translateY(0); }
}

.brand {
  display: flex;
  justify-content: center;
  margin-bottom: 1.75rem;
}

.brand-logo-wrap {
  display: block;
}

.brand-logo-img {
  height: 2.75rem;
  width: auto;
  object-fit: contain;
}

.tabs {
  display: flex;
  gap: 0.375rem;
  margin-bottom: 1.5rem;
  padding: 0.375rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--surface-2);
}

.tab-btn {
  flex: 1;
  min-height: 2.875rem;
  border: 0;
  border-radius: 0.75rem;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 700;
  cursor: pointer;
  transition:
    background var(--transition),
    color var(--transition),
    transform 0.12s ease,
    box-shadow var(--transition);
}

.tab-btn:hover { color: var(--text); }

.tab-btn.active {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  color: var(--text-on-accent);
  box-shadow: 0 10px 20px rgba(var(--accent-rgb), 0.22);
}

.panel { display: none; animation: fadeUp 0.28s cubic-bezier(0.16, 1, 0.3, 1) both; }
.panel.active { display: block; }

.field { margin-bottom: 1rem; }

label {
  display: block;
  margin-bottom: 0.4375rem;
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

input {
  width: 100%;
  min-height: 3.25rem;
  padding: 0 1rem;
  border: 1px solid var(--border);
  border-radius: 0.875rem;
  background: var(--surface);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  outline: none;
  transition:
    border-color var(--transition),
    box-shadow var(--transition),
    background var(--transition);
}

input::placeholder { color: var(--placeholder); }

input:focus {
  border-color: rgba(var(--accent-rgb), 0.42);
  box-shadow: var(--ring);
  background: var(--surface-focus);
}

.btn {
  width: 100%;
  min-height: 3.125rem;
  padding: 0 1rem;
  border: 1px solid transparent;
  border-radius: 0.875rem;
  font-family: var(--font-sans);
  font-size: 0.96rem;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 0.12s ease,
    box-shadow var(--transition),
    background var(--transition),
    color var(--transition),
    border-color var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
}

.btn:active { transform: scale(0.985); }
.btn:disabled { opacity: 0.7; cursor: not-allowed; }

.btn-primary {
  margin-bottom: 0.875rem;
  color: var(--text-on-accent);
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  box-shadow: 0 14px 28px rgba(var(--accent-rgb), 0.22);
}

.btn-primary:hover:not(:disabled) {
  box-shadow: 0 18px 34px rgba(var(--accent-rgb), 0.28);
  transform: translateY(-1px);
}

.divider-text {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0.625rem 0 0.875rem;
  color: var(--text-muted);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.divider-text::before,
.divider-text::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

.btn-google {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}

.btn-google:hover:not(:disabled) {
  background: var(--surface-2);
  border-color: rgba(var(--accent-rgb), 0.28);
  box-shadow: 0 10px 22px rgba(17, 17, 17, 0.06);
}

.btn-google svg {
  width: 1.125rem;
  height: 1.125rem;
  flex-shrink: 0;
}

.error-box,
.success-box {
  display: none;
  margin-top: 0.875rem;
  padding: 0.75rem 0.875rem;
  border-radius: 0.75rem;
  font-size: 0.875rem;
  line-height: 1.45;
  animation: fadeUp 0.22s ease both;
}

.error-box {
  background: rgba(var(--danger-rgb), 0.08);
  border: 1px solid rgba(var(--danger-rgb), 0.18);
  color: var(--danger);
}

.success-box {
  background: rgba(var(--success-rgb), 0.1);
  border: 1px solid rgba(var(--success-rgb), 0.2);
  color: var(--success);
}

.pwd-rules {
  margin-top: 0.625rem;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.pwd-rule {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color var(--transition);
}

.pwd-rule::before { content: "•"; font-size: 1rem; line-height: 1; }
.pwd-rule.ok { color: var(--success); }
.pwd-rule.ok::before { content: "✓"; font-size: 0.85rem; font-weight: 700; }

.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
  display: flex;
  flex-wrap: wrap;  
  flex-direction: row;
  width: 100%;
  justify-content: center;
  gap: 0.5rem;
}

.link-btn:hover { color: var(--accent-hover); opacity: 0.9; }

.spinner {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  border: 2px solid rgba(255, 255, 255, 0.28);
  border-top-color: var(--text-on-accent);
  border-radius: 50%;
  animation: spin 0.55s linear infinite;
  flex-shrink: 0;
}

.spinner-dark {
  border-color: rgba(29, 29, 29, 0.15);
  border-top-color: var(--text);
}

@keyframes spin { to { transform: rotate(360deg); } }

.card-footer {
  margin-top: 1.5rem;
  padding-top: 1.125rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-soft);
  letter-spacing: 0.02em;
}

@media (max-width: 35rem) {
  body { padding: 1.125rem 0.875rem; }

  .card {
    padding: 1.5rem 1.25rem 1.25rem;
    border-radius: 1.25rem;
  }

  .brand-logo-img { height: 2.25rem; }
  .tabs { margin-bottom: 1.25rem; }
  .tab-btn { font-size: 0.875rem; }
}

@media (prefers-color-scheme: dark) {
  .card {
    background: linear-gradient(180deg, rgba(32, 29, 26, 0.96) 0%, rgba(40, 36, 32, 0.94) 100%);
    border-color: var(--border);
  }

  input {
    background: var(--surface);
    color: var(--text);
    border-color: var(--border);
  }

  input::placeholder { color: var(--placeholder); }

  .btn-google {
    background: var(--surface-2);
    border-color: var(--border);
    color: var(--text);
  }

  .btn-google:hover:not(:disabled) {
    background: var(--surface-3);
  }
}