:root {
  color-scheme: light dark;
  --bg: #0f172a;
  --card: #111827;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #38bdf8;
  --accent-hover: #0ea5e9;
  --error-bg: rgba(239, 68, 68, 0.15);
  --error-text: #fecaca;
  --border: rgba(148, 163, 184, 0.2);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", system-ui, sans-serif;
  background:
    radial-gradient(circle at top, rgba(56, 189, 248, 0.12), transparent 35%),
    var(--bg);
  color: var(--text);
  display: grid;
  place-items: center;
  padding: 24px;
}

.card {
  width: min(100%, 420px);
  background: rgba(17, 24, 39, 0.92);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 28px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

.brand {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 24px;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: -0.02em;
  color: #082f49;
  background: linear-gradient(135deg, #7dd3fc, #38bdf8);
}

h1 {
  margin: 0;
  font-size: 1.35rem;
}

.subtitle {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.form {
  display: grid;
  gap: 16px;
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  font-size: 0.9rem;
  color: var(--muted);
}

.field input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.8);
  color: var(--text);
  padding: 12px 14px;
  font-size: 1rem;
}

.field input:focus {
  outline: 2px solid rgba(56, 189, 248, 0.35);
  border-color: var(--accent);
}

.btn {
  border: 0;
  border-radius: 12px;
  padding: 12px 16px;
  font-size: 1rem;
  font-weight: 600;
  color: #082f49;
  background: linear-gradient(135deg, #7dd3fc, #38bdf8);
  cursor: pointer;
}

.btn:hover {
  background: linear-gradient(135deg, #38bdf8, var(--accent-hover));
}

.alert {
  border-radius: 12px;
  padding: 12px 14px;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.alert-error {
  background: var(--error-bg);
  color: var(--error-text);
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.hint {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.45;
}

.login-lang-bar {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 10;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.12);
  border: 1px solid rgba(148, 163, 184, 0.2);
}

.lang-switch-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: #cbd5e1;
  transition: background 0.2s, color 0.2s;
}

.lang-switch-btn:hover {
  color: #e5e7eb;
}

.lang-switch-btn.is-active {
  color: #082f49;
  background: linear-gradient(135deg, #7dd3fc, #38bdf8);
}