:root {
    --page-bg: #111318;
    --page-bg-soft: #151821;

    --surface-bg: #F3F4F6;
    --surface-bg-soft: #FFFFFF;
    --surface-border: #D7DAE0;

    --shell-bg: #171A21;
    --shell-border: #2A2F3A;

    --text-primary: #1F2937;
    --text-secondary: #4B5563;
    --text-muted: #6B7280;

    --text-on-dark: #E5E7EB;
    --text-muted-on-dark: #A0A7B5;

    --accent: #4B5563;
    --accent-hover: #374151;
    --accent-soft: #E5E7EB;

    --danger-bg: #FEE2E2;
    --danger-border: #FCA5A5;
    --danger-text: #991B1B;

    --radius-lg: 1rem;
    --radius-md: 0.65rem;
    --shadow-soft: 0 1rem 2.5rem rgba(0, 0, 0, 0.22);
}

html,
body {
    min-height: 100%;
}

body {
    margin: 0;
    background: 
            radial-gradient(circle at top, rgba(75, 85, 99, 0.25), transparent 26rem),
            var(--page-bg);
    color: var(--text-primary);
}

a {
    color: inherit;
}

.app-shell,
.public-page {
    min-height: 100vh;
}

.app-shell {
    display: flex;
    flex-direction: column;
}

.shell-header {
    min-height: 4rem;
    padding: 0 1.5rem;
    background: var(--shell-bg);
    border-bottom: 1px solid var(--shell-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.shell-brand {
    color: var(--text-on-dark);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
}

.shell-brand:hover,
.shell-brand:focus {
    color: #FFFFFF;
}

.shell-main {
    flex: 1;
    width: 100%;
    padding: 2rem;
    display: flex;
}

.shell-nav {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    margin: 0 auto 0 2rem;
}

.shell-nav-link {
    color: var(--text-muted-on-dark);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    padding: 0.55rem 0.8rem;
    border-radius: var(--radius-md);
}

.shell-nav-link:hover,
.shell-nav-link:focus {
    color: #FFFFFF;
    background-color: rgba(255, 255, 255, 0.07);
}

.page-surface {
    width: 100%;
    background: var(--surface-bg);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
}

.btn {
    border-radius: var(--radius-md);
    font-weight: 500;
}

.btn-shell {
    background-color: transparent;
    border: 1px solid var(--shell-border);
    color: var(--text-on-dark);
}

.btn-shell:hover,
.btn-shell:focus {
    background-color: var(--accent);
    border-color: var(--accent);
    color: #FFFFFF;
}

.btn-access,
.btn-primary-app {
    background-color: var(--accent);
    border-color: var(--accent);
    color: #FFFFFF;
}

.btn-access:hover,
.btn-access:focus,
.btn-primary-app:hover,
.btn-primary-app:focus {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
    color: #FFFFFF;
}

.card {
    background: var(--surface-bg-soft);
    border-color: var(--surface-border);
    border-radius: var(--radius-lg);
}

.form-label {
    color: var(--text-primary);
    font-weight: 600;
}

.form-control {
    background-color: #FFFFFF;
    border-color: #C8CDD5;
    color: var(--text-primary);
    border-radius: var(--radius-md);
}

.form-control:focus {
    background-color: #FFFFFF;
    border-color: #7B8495;
    color: var(--text-primary);
    box-shadow: 0 0 0 0.2rem rgba(107, 114, 128, 0.18);
}

.form-control::placeholder {
    color: #8B93A3;
}

.form-select {
    background-color: #FFFFFF;
    border-color: #C8CDD5;
    color: var(--text-primary);
    border-radius: var(--radius-md);
}

.form-select:focus {
    background-color: #FFFFFF;
    border-color: #7B8495;
    color: var(--text-primary);
    box-shadow: 0 0 0 0.2rem rgba(107, 114, 128, 0.18);
}

.text-muted-soft {
    color: var(--text-muted);
}

.alert-danger {
    background-color: var(--danger-bg);
    border-color: var(--danger-border);
    color: var(--danger-text);
}

.alert-success {
    background-color: #DCFCE7;
    border-color: #86EFAC;
    color: #166534;
}

.dashboard-empty-state {
    flex: 1;
    min-height: calc(100vh - 8rem);
    padding: 2rem;
    display: flex;
}

.dashboard-empty-state .page-surface {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.dashboard-empty-state h1 {
    margin: 0;
    color: var(--text-primary);
    font-size: clamp(2.5rem, 8vw, 6rem);
    font-weight: 700;
    letter-spacing: -0.05rem;
}

@media (max-width: 768px) {
    .shell-header {
        /*padding: 0 1rem;*/
        flex-wrap: wrap;
        gap: 0.75rem;
        padding-top: 0.75rem;
        padding-bottom: 0.75rem;
    }
    
    .shell-nav {
        order: 3;
        width: 100%;
        margin: 0;
        overflow-x: auto;
    }
    
    .shell-main {
        padding: 1rem;
    }
    
    .dashboard-empty-state {
        min-height: calc(100vh - 6rem);
        padding: 0;
    }
}