:root {
    --bg: #f3f6f8;
    --surface: #ffffff;
    --ink: #15202b;
    --muted: #5b6b79;
    --line: #d7e0e7;
    --brand: #0f766e;
    --brand-dark: #0b5f59;
    --accent: #c2410c;
    --ok: #15803d;
    --warn: #b45309;
    --danger: #b91c1c;
    --shadow: 0 10px 30px rgba(21, 32, 43, 0.08);
    --radius: 14px;
    --font: "Segoe UI", "Trebuchet MS", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: var(--font);
    color: var(--ink);
    background:
        radial-gradient(circle at top right, rgba(15, 118, 110, 0.12), transparent 28%),
        linear-gradient(180deg, #eef4f6 0%, var(--bg) 40%, #e8eef2 100%);
    min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, textarea, select { font: inherit; }

.container { width: min(1120px, calc(100% - 2rem)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(10px);
    background: rgba(255,255,255,0.85);
    border-bottom: 1px solid var(--line);
}
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 0;
}
.brand {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--brand-dark);
}
.nav-links { display: flex; gap: 1rem; align-items: center; }
.nav-links a { color: var(--muted); font-weight: 600; }
.nav-links a:hover { color: var(--brand); }
.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.4rem;
    height: 1.4rem;
    padding: 0 .35rem;
    border-radius: 999px;
    background: var(--accent);
    color: white;
    font-size: .75rem;
    font-weight: 700;
    margin-left: .35rem;
}

.hero {
    padding: 2.5rem 0 1.5rem;
}
.hero h1 {
    margin: 0 0 .5rem;
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    letter-spacing: -0.04em;
}
.hero p { margin: 0; color: var(--muted); max-width: 40rem; }

.search-bar {
    margin: 1.5rem 0 2rem;
    display: flex;
    gap: .75rem;
}
.search-bar input {
    flex: 1;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: .85rem 1rem;
    background: var(--surface);
}
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .4rem;
    border: 0;
    border-radius: 12px;
    padding: .85rem 1.15rem;
    font-weight: 700;
    cursor: pointer;
    transition: .15s ease;
}
.btn-primary { background: var(--brand); color: white; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-secondary { background: #e7eef1; color: var(--ink); }
.btn-danger { background: #fee2e2; color: var(--danger); }
.btn-sm { padding: .55rem .85rem; font-size: .9rem; }
.btn-block { width: 100%; }

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1.25rem;
    padding-bottom: 3rem;
}
.product-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    transition: transform .18s ease, box-shadow .18s ease;
}
.product-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 36px rgba(21, 32, 43, 0.12);
}
.product-card img {
    aspect-ratio: 1.2;
    object-fit: cover;
    background: #dbe5eb;
}
.product-body { padding: 1rem; display: flex; flex-direction: column; gap: .55rem; flex: 1; }
.product-body h3 { margin: 0; font-size: 1.05rem; }
.price { color: var(--brand-dark); font-weight: 800; font-size: 1.1rem; }
.muted { color: var(--muted); }
.stock { font-size: .85rem; }

.panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.25rem;
}
.panel + .panel { margin-top: 1rem; }
.page-title { margin: 1.5rem 0 1rem; letter-spacing: -0.03em; }

.form-grid { display: grid; gap: 1rem; }
.form-row { display: grid; gap: .4rem; }
.form-row label { font-weight: 700; font-size: .92rem; }
.form-row input, .form-row textarea, .form-row select {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: .8rem .9rem;
    background: #fff;
}
.form-row textarea { min-height: 110px; resize: vertical; }
.checkbox {
    display: flex;
    align-items: center;
    gap: .55rem;
    font-weight: 600;
}

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: .85rem .6rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
th { font-size: .85rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }

.alert {
    border-radius: 12px;
    padding: .9rem 1rem;
    margin: 1rem 0;
    font-weight: 600;
}
.alert-success { background: #dcfce7; color: var(--ok); }
.alert-error { background: #fee2e2; color: var(--danger); }
.alert-info { background: #e0f2fe; color: #075985; }

.pill {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: .25rem .7rem;
    font-size: .78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .03em;
}
.pill-paid, .pill-processing, .pill-completed { background: #dcfce7; color: var(--ok); }
.pill-pending { background: #ffedd5; color: var(--warn); }
.pill-failed, .pill-cancelled { background: #fee2e2; color: var(--danger); }

.checkout-layout, .product-layout, .admin-layout {
    display: grid;
    gap: 1.25rem;
    padding-bottom: 3rem;
}
.checkout-layout, .product-layout {
    grid-template-columns: 1.4fr .9fr;
}
.admin-layout { grid-template-columns: 220px 1fr; }

.admin-shell { min-height: 100vh; }
.admin-sidebar {
    background: #12343a;
    color: #e7f3f2;
    padding: 1.25rem;
    border-radius: var(--radius);
    height: fit-content;
    position: sticky;
    top: 1rem;
}
.admin-sidebar .brand { color: white; display: block; margin-bottom: 1.5rem; }
.admin-nav { display: grid; gap: .35rem; }
.admin-nav a {
    padding: .7rem .8rem;
    border-radius: 10px;
    color: #c9dedc;
    font-weight: 600;
}
.admin-nav a:hover, .admin-nav a.active { background: rgba(255,255,255,0.1); color: white; }
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
    margin-bottom: 1.25rem;
}
.stat-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1rem;
}
.stat-card .label { color: var(--muted); font-size: .85rem; font-weight: 600; }
.stat-card .value { font-size: 1.5rem; font-weight: 800; margin-top: .35rem; }

.methods {
    display: flex;
    flex-wrap: wrap;
    gap: .6rem;
    margin-top: .5rem;
}
.method-chip {
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: .45rem .8rem;
    font-weight: 700;
    font-size: .85rem;
    background: #f8fafb;
}
.empty {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--muted);
}
.footer {
    border-top: 1px solid var(--line);
    padding: 1.5rem 0 2rem;
    color: var(--muted);
    font-size: .9rem;
}
.actions { display: flex; gap: .6rem; flex-wrap: wrap; }
.qty-input { width: 80px; }

@media (max-width: 860px) {
    .checkout-layout, .product-layout, .admin-layout {
        grid-template-columns: 1fr;
    }
    .admin-sidebar { position: static; }
}