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

:root {
  --bg: #0a0a0f;
  --surface: #13131a;
  --surface2: #1c1c26;
  --border: #2a2a3a;
  --accent: #40e0d0;
  --text: #f5f5f7;
  --text-muted: #8e8ea0;
  --danger: #ff4d4f;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 36px;
  width: 100%;
  max-width: 380px;
}

.login-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 32px;
}

.login-logo-img {
  height: 72px;
  width: auto;
  object-fit: contain;
  margin-bottom: 10px;
}

.login-subtitle {
  color: var(--text-muted);
  font-size: 13px;
}

.form-group { margin-bottom: 16px; }

label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 14px;
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color .15s;
}
.form-control:focus { border-color: var(--accent); }

.btn-login {
  width: 100%;
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: 10px;
  padding: 12px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  margin-top: 8px;
  transition: opacity .15s;
}
.btn-login:hover { opacity: .88; }
.btn-login:disabled { opacity: .5; cursor: not-allowed; }

.error-msg {
  color: var(--danger);
  font-size: 13px;
  margin-top: 12px;
  text-align: center;
  min-height: 18px;
}

.back-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
  padding: 11px 16px;
  border-radius: 10px;
  border: 1.5px solid var(--border);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: border-color .2s, background .2s, color .2s;
}
.back-link:hover {
  border-color: var(--accent);
  background: rgba(64,224,208,0.07);
  color: var(--accent);
}