:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --surface-muted: #f8fafc;
    --border: #dbe3ee;
    --border-strong: #c7d2e0;
    --text: #142235;
    --text-soft: #5a6b7f;
    --heading: #0f1f33;
    --primary: #1f6feb;
    --primary-dark: #184fb0;
    --secondary: #e8eef7;
    --secondary-text: #23405f;
    --success: #177245;
    --success-bg: #edf9f1;
    --error: #b42318;
    --error-bg: #fff1f1;
    --shadow-sm: 0 10px 30px rgba(15, 31, 51, 0.05);
    --shadow-md: 0 18px 40px rgba(15, 31, 51, 0.08);
    --radius-sm: 12px;
    --radius-md: 18px;
    --radius-lg: 24px;
    --max-width: 1140px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: 'Inter', system-ui, sans-serif;
    background:
        radial-gradient(circle at top right, rgba(31, 111, 235, 0.08), transparent 28%),
        linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
    color: var(--text);
    line-height: 1.6;
}

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

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

button,
input,
textarea,
select {
    font: inherit;
}

button,
.button,
a,
input,
textarea,
select {
    transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

:focus-visible {
    outline: 3px solid rgba(31, 111, 235, 0.22);
    outline-offset: 2px;
}

.skip-link {
    position: absolute;
    left: 1rem;
    top: -3rem;
    background: var(--heading);
    color: #fff;
    padding: 0.75rem 1rem;
    border-radius: 999px;
    z-index: 20;
}

.skip-link:focus {
    top: 1rem;
}

.container {
    width: min(var(--max-width), calc(100% - 2rem));
    margin: 0 auto;
}

.page-shell {
    padding-bottom: 3rem;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(219, 227, 238, 0.9);
}

.nav-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    min-height: 4.75rem;
}

.logo {
    font-size: 1rem;
    font-weight: 700;
    color: var(--heading);
    letter-spacing: 0.01em;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.main-nav a,
.user-chip {
    padding: 0.65rem 0.95rem;
    border-radius: 12px;
    color: var(--text-soft);
    font-size: 0.9rem;
}

.main-nav a:hover,
.main-nav a.active {
    background: var(--secondary);
    color: var(--heading);
}

.user-chip {
    background: var(--surface-muted);
    border: 1px solid var(--border);
    color: var(--heading);
    font-weight: 600;
}

.flash-stack {
    display: grid;
    gap: 0.9rem;
    margin: 1.5rem 0 0;
}

.hero,
.form-card,
.card,
.detail-box,
.alert,
.empty-state,
.table-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.hero {
    display: grid;
    gap: 1rem;
    padding: 2.5rem;
    margin: 1.5rem 0 2rem;
    background:
        linear-gradient(135deg, rgba(31, 111, 235, 0.09), rgba(255, 255, 255, 0) 55%),
        var(--surface);
}

.hero h1,
.section-heading h1,
.section-heading h2,
.form-card h1,
.form-card h2,
.detail-box h1,
.detail-box h2 {
    margin: 0;
    color: var(--heading);
    line-height: 1.2;
}

.hero h1 {
    font-size: clamp(1.5rem, 4vw, 3rem);
    max-width: 11ch;
}

.hero p,
.section-heading p,
.helper-text,
.meta {
    color: var(--text-soft);
}

.section-heading {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 1rem;
    margin: 2.2rem 0 1rem;
}

.section-heading.compact {
    margin: 0 0 1.2rem;
}

.form-subsection {
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    margin-top: 1.5rem;
}

.search-form,
.stack-form {
    display: grid;
    gap: 0.9rem;
}

.search-form {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    margin-top: 0.75rem;
}

input,
textarea,
select {
    width: 100%;
    min-height: 3rem;
    padding: 0.8rem 0.95rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--text);
}

textarea {
    min-height: 8rem;
    resize: vertical;
}

input:hover,
textarea:hover,
select:hover {
    border-color: #a9bacf;
}

input:focus,
textarea:focus,
select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(31, 111, 235, 0.12);
    outline: none;
}

button,
.button {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: 0.4rem;
    min-height: 3rem;
    padding: 0.8rem 1.15rem;
    border: 1px solid transparent;
    border-radius: 14px;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 8px 18px rgba(31, 111, 235, 0.16);
}

button:hover,
.button:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

button:disabled,
.button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.button.secondary {
    background: var(--secondary);
    color: var(--secondary-text);
    border-color: var(--border);
    box-shadow: none;
}

.button.secondary:hover {
    background: #dde7f4;
}

.button.danger {
    background: #c53929;
}

.button.small {
    min-height: 2.5rem;
    padding: 0.55rem 0.9rem;
    font-size: 0.92rem;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(245px, 1fr));
    gap: 1.25rem;
}

.card,
.form-card,
.detail-box,
.empty-state {
    padding: 1.4rem;
}

.card {
    display: flex;
    flex-direction: column;
    min-height: 100%;
}

.card-body {
    display: grid;
    gap: 0.55rem;
}

.card-footer {
    margin-top: auto;
    padding-top: 1rem;
}

.card h3 {
    margin: 0;
    font-size: 1rem;
    color: var(--heading);
}

.sku-line {
    margin: 0;
    color: var(--text-soft);
    font-size: 0.8rem;
}

.creator-tag {
    margin: 0;
    font-size: 0.9rem;
    letter-spacing: 0.08em;
    color: red;
}

.detail-stack {
    display: grid;
    gap: 0.35rem;
}

.product-layout,
.admin-form-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.95fr);
    gap: 1.4rem;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.9rem;
    margin: 1.25rem 0 1rem;
}

.info-item {
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface-muted);
}

.info-label {
    display: block;
    margin-bottom: 0.35rem;
    font-size: 0.82rem;
    color: var(--text-soft);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.description-block {
    margin-top: 1.25rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.description-block p {
    margin-bottom: 0;
}

.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.image-grid img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.image-card {
    display: grid;
    gap: 0.75rem;
}

.table-card {
    overflow: auto;
    padding: 0.25rem;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: transparent;
}

.data-table th,
.data-table td {
    padding: 1rem 0.95rem;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}

.data-table th {
    font-size: 0.85rem;
    color: var(--text-soft);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table tbody tr:hover {
    background: #fafcff;
}

.actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.compatibility-row {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.8rem;
    margin-bottom: 0.8rem;
}

.field-group {
    display: grid;
    gap: 0.4rem;
}

.form-card label {
    display: block;
    margin: 0.95rem 0 0.4rem;
    font-weight: 600;
    color: var(--heading);
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 1.25rem;
}

.alert {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.1rem;
    align-items: flex-start;
}

.alert-content {
    display: grid;
    gap: 0.2rem;
}

.alert-content p {
    margin: 0;
}

.alert.success {
    border-color: rgba(23, 114, 69, 0.18);
    background: var(--success-bg);
}

.alert.error {
    border-color: rgba(180, 35, 24, 0.15);
    background: var(--error-bg);
}

.alert-close {
    min-height: auto;
    padding: 0.2rem 0.45rem;
    background: transparent;
    color: var(--text-soft);
    border: none;
    box-shadow: none;
    font-size: 1.3rem;
    line-height: 1;
}

.alert-close:hover {
    background: transparent;
    color: var(--heading);
    transform: none;
}

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

.auth-card {
    max-width: 480px;
    margin: 3rem auto;
    padding: 2rem;
}

.site-footer {
    border-top: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.85);
}

.site-footer-inner {
    padding: 1.5rem 0 2rem;
    color: var(--text-soft);
    font-size: 0.95rem;
}

@media (max-width: 900px) {
    .product-layout,
    .admin-form-layout,
    .section-heading,
    .search-form,
    .compatibility-row,
    .info-grid {
        grid-template-columns: 1fr;
    }

    .nav-wrap {
        flex-direction: column;
        align-items: stretch;
        padding: 0.9rem 0;
    }

    .main-nav {
        width: 100%;
    }

    .hero {
        padding: 1.7rem;
    }
}

@media (max-width: 640px) {
    .container {
        width: min(var(--max-width), calc(100% - 1rem));
    }

    .card,
    .form-card,
    .detail-box,
    .empty-state {
        padding: 1.1rem;
    }

    .data-table th,
    .data-table td {
        padding: 0.85rem 0.75rem;
    }

    .actions {
        align-items: stretch;
    }

    .actions form,
    .actions .button,
    .actions button {
        width: 100%;
    }
}