:root {
  --navy: #002F52;
  --green: #4A7A5C;
  --bg: #F7F5F0;
  --card: #FFFFFF;
  --text: #1F2A24;
  --muted: #6B7570;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.screen { min-height: 100vh; }
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.login-card {
  background: var(--card);
  border-radius: 16px;
  padding: 32px 28px;
  max-width: 360px;
  width: 100%;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
  text-align: center;
}
.login-card h1 {
  font-size: 22px;
  color: var(--navy);
  margin: 0 0 4px;
}
.subtitle {
  color: var(--muted);
  margin: 0 0 24px;
  font-size: 14px;
}
.login-card label {
  display: block;
  text-align: left;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}
.login-card input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid #D8D4C8;
  border-radius: 10px;
  font-size: 15px;
  margin-bottom: 14px;
}
.login-card button {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 10px;
  background: var(--green);
  color: white;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
.login-card button:disabled { opacity: 0.6; cursor: default; }
.status-msg {
  margin-top: 14px;
  font-size: 13px;
  color: var(--muted);
  min-height: 18px;
}
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--navy);
  color: white;
}
.user-info { font-size: 12px; opacity: 0.85; margin-top: 2px; }
.link-btn {
  background: none;
  border: 1px solid rgba(255,255,255,0.4);
  color: white;
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
}
.app-main { padding: 24px; max-width: 640px; margin: 0 auto; }