:root { color-scheme: light; font-family: Inter, "Segoe UI", sans-serif; color: #18334a; background: #f4f7fb; }
body { margin: 0; }
a { color: #165ba8; }
.shell-header { display: flex; align-items: center; gap: 24px; padding: 22px clamp(20px, 5vw, 64px); background: #fff; border-bottom: 1px solid #e0e7ef; }
.shell-header a { color: #163951; font-size: 24px; font-weight: 700; text-decoration: none; }
.shell-header span, footer { color: #5d7083; font-size: 14px; }
.shell-main { max-width: 1100px; margin: 0 auto; padding: 48px 24px; }
.login-panel { max-width: 420px; margin: 3vh auto; padding: 32px; background: white; border: 1px solid #e0e7ef; border-radius: 16px; box-shadow: 0 12px 32px #20364b0a; }
h1 { font-size: 28px; margin: 0 0 16px; }
h2 { font-size: 20px; margin-top: 0; }
p { line-height: 1.6; color: #556b80; }
label { display: block; margin: 22px 0 8px; font-weight: 600; }
.form-actions { margin-top: 28px; }
.error-message { color: #a51e31; }
.page-heading { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.home-panel { margin-top: 24px; padding: 24px; border: 1px solid #e0e7ef; background: #fff; border-radius: 12px; }
.tenant-link { display: inline-block; padding: 12px 16px; margin: 4px; border: 1px solid #dbe4ee; border-radius: 8px; }
footer { padding: 24px; text-align: center; }
@media(max-width: 600px) { .shell-main { padding: 28px 16px; } .login-panel { padding: 24px; } .shell-header span { display: none; } }