:root {
    --color-bg: #f3f6fb; --color-surface: #fff; --color-primary: #173b67;
    --color-primary-hover: #102d51; --color-accent: #2563eb; --color-text: #172033;
    --color-muted: #667085; --color-border: #dce3ec; --color-success: #067647;
    --color-success-bg: #ecfdf3; --color-danger: #b42318; --color-danger-bg: #fef3f2;
    --radius: 14px; --shadow: 0 10px 30px rgba(23, 59, 103, .08);
}
* { box-sizing: border-box; }
html { min-height: 100%; }
body { min-height: 100vh; margin: 0; background: var(--color-bg); color: var(--color-text); font-family: "Plus Jakarta Sans", system-ui, sans-serif; line-height: 1.5; }
a { color: var(--color-accent); }
.public-layout { background: radial-gradient(circle at top, #e7effa, var(--color-bg) 48%); }
.public-main { display: grid; min-height: calc(100vh - 56px); place-items: center; padding: 4rem 1.25rem 2rem; }
.app-header { position: sticky; top: 0; z-index: 100; display: flex; min-height: 72px; align-items: center; gap: 2rem; padding: 0 2rem; border-bottom: 1px solid var(--color-border); background: rgba(255,255,255,.94); backdrop-filter: blur(12px); }
.development-environment-banner + .app-header { top: 30px; }
.brand { display: inline-flex; align-items: center; gap: .7rem; color: var(--color-primary); font-size: 1rem; font-weight: 700; text-decoration: none; }
.brand-mark { display: grid; width: 36px; height: 36px; place-items: center; border-radius: 10px; background: var(--color-primary); color: #fff; }
.main-nav { display: flex; align-self: stretch; gap: .25rem; }
.main-nav a { display: flex; align-items: center; padding: 0 .9rem; border-bottom: 3px solid transparent; color: var(--color-muted); font-size: .9rem; font-weight: 600; text-decoration: none; }
.main-nav a:hover, .main-nav a.active { border-color: var(--color-accent); color: var(--color-primary); }
.account-menu { display: flex; align-items: center; gap: 1rem; margin-left: auto; }
.account-menu form { margin: 0; }
.account-identity { display: flex; flex-direction: column; text-align: right; }
.account-identity strong { font-size: .85rem; }
.account-identity small { color: var(--color-muted); font-size: .72rem; }
.app-main { width: min(1120px, calc(100% - 2.5rem)); min-height: calc(100vh - 126px); margin: 0 auto; padding: 2.5rem 0; }
.app-footer { display: flex; justify-content: space-between; padding: 1rem 2rem; color: var(--color-muted); font-size: .75rem; }
.auth-card, .panel { border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-surface); box-shadow: var(--shadow); }
.auth-card { width: min(100%, 440px); padding: 2.25rem; }
.auth-logo { margin-bottom: 1.5rem; color: var(--color-primary); font-weight: 700; }
.auth-card h1, .page-heading h1 { margin: 0 0 .4rem; color: var(--color-primary); line-height: 1.2; }
.auth-card h1 { font-size: 1.65rem; }
.auth-card > p, .page-heading p { margin: 0 0 1.75rem; color: var(--color-muted); }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: .4rem; font-size: .82rem; font-weight: 600; }
.form-control { width: 100%; min-height: 44px; padding: .7rem .85rem; border: 1px solid #cbd5e1; border-radius: 9px; background: #fff; color: var(--color-text); font: inherit; }
.form-control:focus { border-color: var(--color-accent); outline: 3px solid rgba(37,99,235,.12); }
.form-help { display: block; margin-top: .35rem; color: var(--color-muted); font-size: .72rem; }
.button { display: inline-flex; min-height: 42px; align-items: center; justify-content: center; padding: .65rem 1rem; border: 1px solid transparent; border-radius: 9px; background: var(--color-primary); color: #fff; cursor: pointer; font: inherit; font-size: .85rem; font-weight: 700; text-decoration: none; }
.button:hover { background: var(--color-primary-hover); }
.button-block { width: 100%; }
.button-small { min-height: 34px; padding: .4rem .7rem; font-size: .75rem; }
.button-ghost { border-color: var(--color-border); background: #fff; color: var(--color-primary); }
.button-ghost:hover { background: #f8fafc; }
.alert { margin-bottom: 1.2rem; padding: .8rem 1rem; border-radius: 9px; font-size: .83rem; }
.alert-error { border: 1px solid #fecdca; background: var(--color-danger-bg); color: var(--color-danger); }
.alert-success { border: 1px solid #abefc6; background: var(--color-success-bg); color: var(--color-success); }
.page-heading { display: flex; align-items: start; justify-content: space-between; gap: 1rem; margin-bottom: 1.5rem; }
.page-heading h1 { font-size: 1.8rem; }
.panel { padding: 1.5rem; }
.account-panel { max-width: 560px; }
.form-row, .session-forms { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.session-forms { align-items: start; margin-bottom: 1.25rem; }
.session-list { margin-top: 1.25rem; }
.dashboard-panel { margin-top: 1.25rem; }
.button:disabled { cursor: not-allowed; opacity: .5; }
.dashboard-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.dashboard-grid-four { grid-template-columns: repeat(4, 1fr); }
.stat-card { padding: 1.3rem; border: 1px solid var(--color-border); border-radius: 12px; background: var(--color-surface); color: inherit; text-decoration: none; }
.stat-card:hover { border-color: #a9bcd2; box-shadow: var(--shadow); }
.stat-card span { color: var(--color-muted); font-size: .78rem; }
.stat-card strong { display: block; margin-top: .35rem; color: var(--color-primary); font-size: 1.15rem; overflow-wrap: anywhere; }
.split-layout { display: grid; grid-template-columns: minmax(280px,.8fr) minmax(0,1.6fr); gap: 1.25rem; align-items: start; }
.panel h2 { margin: 0 0 1.25rem; color: var(--color-primary); font-size: 1.1rem; }
.table-wrapper { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .83rem; }
th, td { padding: .85rem .7rem; border-bottom: 1px solid var(--color-border); text-align: left; }
th { color: var(--color-muted); font-size: .72rem; text-transform: uppercase; }
.badge { display: inline-flex; padding: .25rem .55rem; border-radius: 99px; background: #eef4ff; color: #3538cd; font-size: .7rem; font-weight: 700; }
.badge-admin { background: #f4ebff; color: #6941c6; }
.status-active { color: var(--color-success); font-weight: 700; }
.status-inactive { color: var(--color-danger); font-weight: 700; }
@media (max-width: 760px) {
    .app-header { flex-wrap: wrap; gap: .6rem 1rem; padding: .8rem 1rem; }
    .main-nav { order: 3; width: 100%; min-height: 42px; }
    .main-nav a { padding: 0 .6rem; }
    .account-identity { display: none; }
    .app-main { width: min(100% - 1.5rem,1120px); padding: 1.5rem 0; }
    .dashboard-grid, .dashboard-grid-four, .split-layout { grid-template-columns: 1fr; }
    .form-row, .session-forms { grid-template-columns: 1fr; }
    .page-heading { flex-direction: column; }
    .app-footer { padding: 1rem; }
}