:root {
    --ink: #18202b;
    --muted: #6b7280;
    --line: #d9dee7;
    --panel: #ffffff;
    --soft: #f5f7fb;
    --brand: #b4232c;
    --brand-dark: #841922;
    --accent: #1f7a5c;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    color: var(--ink);
    font-family: Arial, "Microsoft YaHei", sans-serif;
    background: var(--soft);
}

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

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

.topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    gap: 24px;
    min-height: 68px;
    padding: 0 32px;
    background: rgba(255, 255, 255, .96);
    border-bottom: 1px solid var(--line);
}

.brand {
    font-weight: 800;
    font-size: 22px;
    color: var(--brand);
    white-space: nowrap;
}

.nav, .account, .actions, .table-actions {
    display: flex;
    align-items: center;
    gap: 14px;
}

.nav {
    flex: 1;
    flex-wrap: wrap;
}

.account {
    margin-left: auto;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.button, button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 0 16px;
    border: 1px solid var(--brand);
    border-radius: 6px;
    background: var(--brand);
    color: #fff;
    cursor: pointer;
}

.button.ghost, button:disabled {
    background: #fff;
    color: var(--brand);
}

button:disabled {
    cursor: not-allowed;
    opacity: .6;
}

.link-button {
    min-height: auto;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--brand);
}

.full {
    width: 100%;
    margin-top: 10px;
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(320px, 520px);
    gap: 32px;
    align-items: center;
    min-height: calc(100vh - 160px);
    padding: 56px 8vw 32px;
    background: #fff;
}

.hero h1 {
    margin: 0 0 16px;
    font-size: clamp(36px, 6vw, 68px);
    line-height: 1.05;
}

.hero p {
    max-width: 720px;
    color: var(--muted);
    font-size: 18px;
}

.eyebrow {
    color: var(--accent) !important;
    font-weight: 700;
}

.section {
    max-width: 1180px;
    margin: 0 auto;
    padding: 48px 24px;
}

.section-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 22px;
}

.grid {
    display: grid;
    gap: 18px;
}

.cards {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.cases {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card, .auth-panel, .side-panel, .canvas-panel, .profile-card, .empty, .stat {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 20px;
}

.product-card h3 {
    margin-bottom: 6px;
}

.placeholder {
    display: grid;
    place-items: center;
    min-height: 280px;
    padding: 24px;
    border: 1px dashed #aab3c2;
    border-radius: 8px;
    background: #eef1f6;
    color: #596273;
    text-align: center;
    line-height: 1.8;
}

.placeholder.small {
    min-height: 170px;
}

.band {
    max-width: none;
    background: #111827;
    color: #fff;
    text-align: center;
}

.feature-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.feature-list span {
    padding: 10px 14px;
    border: 1px solid rgba(255,255,255,.25);
    border-radius: 999px;
}

.feature-list.light span {
    border-color: var(--line);
    color: var(--ink);
}

.two-col {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 28px;
    align-items: center;
}

.auth-panel, .narrow {
    max-width: 520px;
    margin: 48px auto;
}

.form {
    display: grid;
    gap: 16px;
}

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

.form input, .form textarea, .form select, select, table input, table select {
    width: 100%;
    min-height: 40px;
    padding: 8px 10px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #fff;
}

.form textarea {
    min-height: 110px;
}

.check, .checks label {
    display: inline-flex !important;
    grid-template-columns: auto;
    align-items: center;
    gap: 8px;
    font-weight: 400 !important;
}

.check input, .checks input {
    width: auto;
    min-height: auto;
}

.checks, .form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
}

.muted {
    color: var(--muted);
}

.flash {
    max-width: 980px;
    margin: 16px auto 0;
    padding: 12px 16px;
    border-radius: 6px;
    background: #e7f7ef;
    color: #10623f;
}

.flash.error {
    background: #fff0f0;
    color: #a1121d;
}

.avatar {
    display: inline-grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: 999px;
    background: var(--brand);
    color: #fff;
    font-weight: 800;
}

.avatar.big {
    width: 72px;
    height: 72px;
    font-size: 28px;
}

.profile-card {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 20px;
}

.workspace {
    display: grid;
    grid-template-columns: 250px minmax(360px, 1fr) 280px;
    gap: 16px;
    padding: 24px;
}

.category-row {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    padding: 10px 0;
    border-bottom: 1px solid var(--line);
}

.category-row em {
    color: var(--brand);
    font-style: normal;
}

.toolbar {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
}

.assembly-canvas {
    display: grid;
    place-items: center;
    min-height: 520px;
    border: 1px dashed #9ba6b7;
    border-radius: 8px;
    background:
        linear-gradient(90deg, rgba(0,0,0,.04) 1px, transparent 1px),
        linear-gradient(rgba(0,0,0,.04) 1px, transparent 1px),
        #fff;
    background-size: 32px 32px;
    color: var(--muted);
    text-align: center;
}

.total {
    margin: 18px 0;
    padding: 14px;
    border-radius: 6px;
    background: #fff4e9;
    color: #8a3d00;
    font-weight: 800;
}

.admin-shell {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 24px;
    padding: 24px;
}

.admin-nav {
    display: grid;
    align-content: start;
    gap: 8px;
    padding: 20px;
    border-radius: 8px;
    background: #111827;
    color: #fff;
}

.admin-nav a, .admin-nav span {
    padding: 10px 12px;
    border-radius: 6px;
}

.admin-nav a {
    background: rgba(255,255,255,.08);
}

.admin-nav span {
    color: rgba(255,255,255,.55);
}

.admin-content {
    min-width: 0;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 14px;
    margin-bottom: 22px;
}

.stat span {
    display: block;
    color: var(--muted);
}

.stat strong {
    display: block;
    margin-top: 8px;
    font-size: 28px;
}

.table-wrap {
    overflow-x: auto;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 760px;
}

th, td {
    padding: 12px;
    border-bottom: 1px solid var(--line);
    text-align: left;
    vertical-align: middle;
}

th {
    background: #f8fafc;
}

.admin-form {
    max-width: 820px;
}

@media (max-width: 900px) {
    .topbar, .hero, .two-col, .workspace, .admin-shell {
        grid-template-columns: 1fr;
    }

    .topbar {
        display: grid;
        padding: 16px;
    }

    .account {
        margin-left: 0;
        justify-content: flex-start;
    }

    .workspace, .admin-shell {
        padding: 16px;
    }
}