:root {
    --app-bg: #f3f4f6;
    --app-surface: #ffffff;
    --app-surface-muted: #f8fafc;
    --app-border: #dfe3e8;
    --app-text: #111827;
    --app-muted: #5b6472;
    --app-accent: #111827;
    --app-accent-soft: #e5e7eb;
    --app-focus: rgba(17, 24, 39, 0.14);
    --shadow-soft: 0 20px 40px rgba(15, 23, 42, 0.04);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--app-bg);
    color: var(--app-text);
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.5;
}

main {
    min-height: calc(100vh - 160px);
}

.py-lg-6 {
    padding-top: 5rem !important;
    padding-bottom: 5rem !important;
}

.bg-white {
    background-color: #fff !important;
}

.app-navbar {
    backdrop-filter: saturate(180%) blur(12px);
}

.navbar-brand {
    display: inline-flex;
    gap: 0.75rem;
    align-items: center;
    letter-spacing: -0.02em;
}

.brand-mark {
    width: 2rem;
    height: 2rem;
    border-radius: 10px;
    background: var(--app-accent);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
}

.nav-link {
    color: var(--app-muted);
    font-weight: 500;
}

.nav-link.active,
.nav-link:hover {
    color: var(--app-text);
}

.hero-shell {
    background: #fff;
}

.eyebrow,
.section-kicker {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--app-muted);
    font-weight: 700;
}

.display-5 {
    letter-spacing: -0.04em;
}

.lead {
    font-size: 1.05rem;
}

.panel-card,
.feature-card,
.metric-card,
.stat-card,
.success-panel {
    background: var(--app-surface);
    border: 1px solid var(--app-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
}

.metric-card,
.feature-card,
.stat-card {
    padding: 1.25rem;
    height: 100%;
}

.metric-value,
.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.04em;
}

.metric-label,
.detail-label {
    color: var(--app-muted);
    font-size: 0.9rem;
}

.stack-list {
    display: grid;
    gap: 0.75rem;
}

.stack-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    border: 1px solid var(--app-border);
    border-radius: var(--radius-sm);
    padding: 0.85rem 1rem;
    background: var(--app-surface-muted);
    font-size: 0.95rem;
}

.notice-box,
.success-panel {
    padding: 1rem;
    background: var(--app-surface-muted);
    border-radius: var(--radius-md);
    border: 1px solid var(--app-border);
    color: var(--app-muted);
}

.form-control,
.form-select {
    min-height: 46px;
    border-color: var(--app-border);
    border-radius: 10px;
    padding: 0.75rem 0.9rem;
}

textarea.form-control {
    min-height: 140px;
}

.form-control:focus,
.form-select:focus,
.btn:focus,
.navbar-toggler:focus {
    border-color: var(--app-accent);
    box-shadow: 0 0 0 0.2rem var(--app-focus);
}

.btn {
    border-radius: 10px;
    font-weight: 600;
    padding-top: 0.7rem;
    padding-bottom: 0.7rem;
}

.btn-sm {
    padding-top: 0.45rem;
    padding-bottom: 0.45rem;
}

.btn-dark {
    background: var(--app-accent);
    border-color: var(--app-accent);
}

.btn-dark:hover,
.btn-dark:focus {
    background: #030712;
    border-color: #030712;
}

code {
    color: var(--app-text);
    background: #eef2f7;
    padding: 0.2rem 0.45rem;
    border-radius: 6px;
    font-size: 0.9em;
}

.auth-shell {
    background: var(--app-bg);
}

.sticky-offset {
    top: 5.5rem;
}

.admin-table th {
    color: var(--app-muted);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    background: var(--app-surface-muted);
    white-space: nowrap;
}

.admin-table th,
.admin-table td {
    padding: 1rem 1rem;
    border-color: var(--app-border);
}

.admin-table tbody tr:hover {
    background: #fafafa;
}

.empty-state {
    background: var(--app-surface-muted);
}

.detail-value {
    font-size: 1rem;
    font-weight: 600;
}

.detail-copy {
    background: var(--app-surface-muted);
    border: 1px solid var(--app-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    color: var(--app-text);
}

.toast {
    border-radius: 12px;
}

@media (max-width: 991.98px) {
    .py-lg-6 {
        padding-top: 3.5rem !important;
        padding-bottom: 3.5rem !important;
    }

    .sticky-offset {
        top: 0;
    }
}