:root {
    font-family: 'Poppins', sans-serif;
    color-scheme: light;
    --bg: #0f172a;
    --panel: #111827;
    --surface: #141b2f;
    --surface-soft: #1b263f;
    --text: #f8fafc;
    --muted: #94a3b8;
    --primary: #3b82f6;
    --accent: #2563eb;
    --border: rgba(148,163,184,.12);
    --radius: 1.5rem;
    --shadow: 0 30px 90px rgba(0,0,0,.38);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: linear-gradient(180deg, #0b1220 0%, #0f172a 100%);
    color: var(--text);
}

.admin-shell {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
}

.admin-sidebar {
    padding: 2rem 1.5rem;
    background: rgba(15,23,42,.98);
    border-right: 1px solid rgba(148,163,184,.1);
}

.admin-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.admin-brand .brand-mark {
    width: 3rem;
    height: 3rem;
    display: grid;
    place-items: center;
    border-radius: 1rem;
    background: var(--primary);
    color: #0f172a;
    font-weight: 800;
}

.admin-brand h1 {
    margin: 0;
    font-size: 1.25rem;
}

.admin-brand p {
    margin: 0;
    color: var(--muted);
}

.admin-nav {
    display: grid;
    gap: .75rem;
}

.admin-nav a {
    display: block;
    padding: .95rem 1rem;
    border-radius: 1rem;
    color: var(--text);
    background: transparent;
    transition: background var(--transition), color var(--transition);
}

.admin-nav a:hover,
.admin-nav a.active {
    background: rgba(125,211,252,.12);
    color: var(--primary);
}

.admin-main {
    padding: 2rem 2.5rem;
}

.admin-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.admin-topbar h2 {
    margin: 0;
}

.btn {
    border: none;
    border-radius: 999px;
    padding: .95rem 1.4rem;
    font-weight: 700;
}

.btn-primary {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: white;
}

.btn-secondary {
    background: rgba(255,255,255,.08);
    color: var(--text);
    border: 1px solid rgba(148,163,184,.12);
}

.login-card {
    max-width: 520px;
    margin: 4rem auto;
    background: rgba(15,23,42,.94);
    padding: 2.5rem;
    border-radius: 2rem;
    border: 1px solid rgba(148,163,184,.12);
    box-shadow: var(--shadow);
}

.login-panel > div {
    margin-bottom: 2rem;
}

.login-panel h2 {
    margin: .5rem 0 1rem;
}

.login-panel p {
    color: var(--muted);
}

.login-card input,
.login-card button,
.form-grid input,
.form-grid textarea,
.form-grid button {
    width: 100%;
    padding: 1rem 1.1rem;
    border-radius: 1rem;
    border: 1px solid rgba(148,163,184,.12);
    background: rgba(15,23,42,.7);
    color: var(--text);
}

.login-card button,
.form-grid button {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: white;
    font-weight: 700;
    border: none;
}

.dashboard-grid,
.stats-grid,
.stack-list,
.form-grid {
    display: grid;
    gap: 1rem;
}

.stats-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stat-card,
.panel {
    background: rgba(15,23,42,.95);
    border: 1px solid rgba(148,163,184,.12);
    border-radius: 1.5rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.hero-panel {
    padding: 2rem;
}

.quick-actions {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
    margin-top: 1.25rem;
}

.quick-actions a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: .85rem 1.1rem;
    border-radius: 999px;
    background: rgba(255,255,255,.08);
    color: white;
}

.stack-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.stack-list li {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding-bottom: .85rem;
    border-bottom: 1px solid rgba(148,163,184,.1);
}

.stack-list li strong,
.stack-list li span {
    color: var(--text);
}

.actions {
    display: flex;
    gap: .75rem;
}

.actions a {
    color: var(--primary);
}

@media (max-width: 1024px) {
    .admin-shell {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .admin-main {
        padding: 1rem;
    }
}