:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --surface-soft: #eef3ff;
    --text: #172033;
    --muted: #5f6b85;
    --primary: #3b82f6;
    --primary-dark: #1d4ed8;
    --accent: #8b5cf6;
    --danger: #dc2626;
    --danger-dark: #b91c1c;
    --border: #d8e1f0;
    --shadow: 0 18px 40px rgba(23, 32, 51, 0.12);
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 10px;
    --container: 1120px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, #f7f9fc 0%, #eef4ff 100%);
    line-height: 1.6;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input {
    font: inherit;
}

button {
    cursor: pointer;
}

.site-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

.container {
    width: min(100% - 32px, var(--container));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(12px);
    background: rgba(244, 247, 251, 0.88);
    border-bottom: 1px solid rgba(216, 225, 240, 0.9);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 18px 0;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.15rem;
}

.brand-mark {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    box-shadow: 0 12px 24px rgba(59, 130, 246, 0.22);
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
}

.nav-link {
    padding: 10px 14px;
    border-radius: 999px;
    color: var(--muted);
    font-weight: 700;
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link.active {
    background: var(--surface);
    color: var(--text);
    transform: translateY(-1px);
}

.nav-link-secondary {
    color: var(--primary-dark);
    background: rgba(59, 130, 246, 0.08);
}

.hero,
.page-hero {
    padding: 72px 0 32px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.25fr 0.9fr;
    gap: 28px;
    align-items: center;
}

.hero-copy h1,
.page-hero h1 {
    margin: 0 0 16px;
    font-size: clamp(2.2rem, 5vw, 4rem);
    line-height: 1.08;
}

.hero-text,
.page-hero-text {
    max-width: 640px;
    color: var(--muted);
    font-size: 1.05rem;
    margin: 0;
}

.eyebrow {
    display: inline-block;
    margin: 0 0 12px;
    color: var(--primary-dark);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.hero-actions,
.cart-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 28px;
}

.hero-card,
.panel,
.auth-card,
.admin-card,
.feature-card,
.stat-card,
.promo-banner {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.hero-card {
    padding: 24px;
    display: grid;
    gap: 16px;
}

.stat-card {
    padding: 20px;
    border-radius: var(--radius-md);
    box-shadow: none;
    background: linear-gradient(180deg, #ffffff 0%, #f6f8ff 100%);
}

.stat-label {
    display: block;
    margin-bottom: 8px;
    color: var(--primary-dark);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.section {
    padding: 32px 0 72px;
}

.section-muted {
    padding-top: 0;
}

.section-heading {
    margin-bottom: 24px;
}

.section-heading h2 {
    margin: 0;
    font-size: clamp(1.7rem, 3vw, 2.4rem);
}

.section-heading-inline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

.feature-card {
    padding: 24px;
}

.feature-card h3 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.feature-card p,
.form-note,
.footer-inner p {
    margin: 0;
    color: var(--muted);
}

.promo-banner {
    padding: 28px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.products-grid,
#products-container {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
}

.product {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 18px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.product:hover {
    transform: translateY(-6px);
    box-shadow: 0 22px 48px rgba(23, 32, 51, 0.16);
}

.product img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-radius: var(--radius-md);
    background: var(--surface-soft);
}

.product h2,
.product h3 {
    margin: 0;
    font-size: 1.2rem;
}

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

.btn,
button,
.add-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 46px;
    padding: 12px 18px;
    border: none;
    border-radius: 999px;
    font-weight: 700;
    transition: transform 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover,
button:hover,
.add-btn:hover {
    transform: translateY(-1px);
}

.btn-primary,
.add-btn,
button.add-btn {
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    box-shadow: 0 14px 28px rgba(59, 130, 246, 0.25);
}

.btn-secondary {
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
}

.btn-danger,
#clear-cart {
    color: #fff;
    background: linear-gradient(135deg, var(--danger), var(--danger-dark));
}

.form-wrap {
    display: flex;
    justify-content: center;
}

.auth-card,
.admin-card {
    width: min(100%, 580px);
    padding: 32px;
}

.auth-form,
.admin-form {
    display: grid;
    gap: 18px;
}

.form-field {
    display: grid;
    gap: 8px;
    font-weight: 700;
}

.form-field span {
    font-size: 0.95rem;
}

.form-field input {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: #fff;
    color: var(--text);
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-field input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.12);
}

.status-message {
    min-height: 24px;
    margin: 16px 0 0;
    color: var(--muted);
    font-weight: 700;
}

.cart-layout {
    display: grid;
    grid-template-columns: 1.4fr 0.8fr;
    gap: 24px;
    align-items: start;
}

.panel {
    padding: 24px;
}

.cart-list,
#cart-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 14px;
}

#cart-list li {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 16px 18px;
    background: #f9fbff;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

#cart-list div {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
}

#cart-list button {
    min-height: 38px;
    padding: 8px 14px;
    border-radius: 999px;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
}

.cart-summary {
    position: sticky;
    top: 100px;
}

.cart-total,
#cart-total {
    margin: 12px 0 0;
    font-size: 1.4rem;
    font-weight: 700;
}

.site-footer {
    border-top: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.75);
}

.footer-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 22px 0;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    color: var(--muted);
    font-weight: 700;
}

@media (max-width: 960px) {
    .hero-grid,
    .cart-layout,
    .feature-grid,
    .products-grid,
    #products-container {
        grid-template-columns: 1fr 1fr;
    }

    .hero-grid,
    .cart-layout {
        grid-template-columns: 1fr;
    }

    .cart-summary {
        position: static;
    }
}

@media (max-width: 720px) {
    .header-inner,
    .promo-banner,
    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .site-nav {
        width: 100%;
    }

    .products-grid,
    #products-container,
    .feature-grid {
        grid-template-columns: 1fr;
    }

    .hero,
    .page-hero {
        padding-top: 48px;
    }

    .auth-card,
    .admin-card,
    .panel {
        padding: 22px;
    }
}