:root {
    --color-bg: #f7f7f6;
    --color-surface: #ffffff;
    --color-border: #e5e5e3;
    --color-border-hover: #d1d1cf;
    --color-text-primary: #1c1c1c;
    --color-text-secondary: #5c5c5c;
    --color-text-tertiary: #949494;
    --color-accent: #1664FF;
    --color-accent-hover: #1255dd;
    --color-accent-light: #e8efff;
    --color-accent-subtle: #f0f4ff;
    --color-tag-bg: #ededec;
    --color-tag-text: #5a5a58;
    --color-highlight: #6b7280;
    --color-overlay: rgba(0, 0, 0, 0.4);

    --spacing-0: 0;
    --spacing-0-5: 0.125rem;
    --spacing-1: 0.25rem;
    --spacing-1-5: 0.375rem;
    --spacing-2: 0.5rem;
    --spacing-2-5: 0.625rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;

    --text-2xs: 0.75rem;
    --text-xs: 0.8125rem;
    --text-sm: 0.875rem;
    --text-base: 0.9375rem;
    --text-body: 1rem;
    --text-lg: 1.0625rem;
    --text-xl: 1.125rem;
    --text-2xl: 1.25rem;
    --text-3xl: 1.4375rem;
    --text-4xl: 1.75rem;

    --weight-normal: 400;
    --weight-medium: 500;
    --weight-semibold: 600;

    --radius-sm: 0.1875rem;
    --radius-md: 0.25rem;
    --radius-lg: 0.375rem;
    --radius-xl: 0.5rem;

    --shadow-xs: 0 0.0625rem 0.125rem rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 0.0625rem 0.1875rem rgba(0, 0, 0, 0.05);
    --shadow-md: 0 0.125rem 0.375rem rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 0.25rem 0.75rem rgba(0, 0, 0, 0.09);

    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;

    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-overlay: 300;
    --z-modal: 400;

    --container-max: 75rem;
    --container-narrow: 48rem;
    --header-height: 3.25rem;

    font-size: 16px;
}

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

ul,
ol {
    list-style: none;
}

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

button {
    cursor: pointer;
    border: none;
    background: none;
    font: inherit;
}

input {
    font: inherit;
    border: none;
    outline: none;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
    color: var(--color-text-primary);
    line-height: 1.65;
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: var(--color-surface);
    border-bottom: 0.0625rem solid var(--color-border);
    z-index: var(--z-sticky);
}

.nav-container {
    max-width: var(--container-max);
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--spacing-5);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: var(--text-xl);
    font-weight: var(--weight-semibold);
    color: var(--color-accent);
    letter-spacing: -0.02em;
}

.logo a:hover {
    color: var(--color-accent-hover);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    padding: var(--spacing-2);
    cursor: pointer;
}

.mobile-menu-toggle .bar {
    width: 1.125rem;
    height: 0.125rem;
    background-color: var(--color-text-primary);
    border-radius: 0.0625rem;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-menu {
    display: flex;
    align-items: center;
}

.main-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-1);
}

.menu-item {
    position: relative;
}

.menu-item > a {
    display: flex;
    align-items: center;
    padding: var(--spacing-1-5) var(--spacing-2-5);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background var(--transition-fast);
    white-space: nowrap;
}

.menu-item > a:hover,
.menu-item.active > a {
    color: var(--color-accent);
    background: var(--color-accent-light);
}

.sub-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 10rem;
    background-color: var(--color-surface);
    border: 0.0625rem solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-1) 0;
    z-index: var(--z-dropdown);
}

.sub-menu.show {
    display: block;
}

.sub-menu li a {
    display: block;
    padding: var(--spacing-1-5) var(--spacing-4);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast), background var(--transition-fast);
}

.sub-menu li a:hover {
    color: var(--color-accent);
    background: var(--color-accent-light);
}

.main-content {
    margin-top: var(--header-height);
    padding: var(--spacing-8) var(--spacing-5);
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    flex: 1;
    width: 100%;
    box-sizing: border-box;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-3);
}

.product-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 0.0625rem solid var(--color-border);
    overflow: hidden;
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.product-card:hover {
    transform: translateY(-0.0625rem);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-sm);
}

.product-card a {
    display: block;
}

.product-image {
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: var(--color-accent-subtle);
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-base);
}

.product-card:hover .product-image img {
    transform: scale(1.02);
}

.product-title {
    font-size: var(--text-body);
    font-weight: var(--weight-medium);
    color: var(--color-text-primary);
    padding: var(--spacing-3) var(--spacing-3) var(--spacing-1);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

.product-summary {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    padding: 0 var(--spacing-3);
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.5;
}

.product-meta {
    padding: var(--spacing-1) var(--spacing-3) var(--spacing-3);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-1);
    line-height: 1.5;
}

.product-meta span {
    display: inline-flex;
    align-items: center;
    font-size: var(--text-xs);
    padding: var(--spacing-0-5) var(--spacing-2);
    background: var(--color-accent-subtle);
    border-radius: var(--radius-md);
    line-height: 1.5;
    white-space: nowrap;
}

.product-meta .industry {
    color: var(--color-text-primary);
    font-weight: var(--weight-medium);
}

.footer {
    background-color: var(--color-surface);
    border-top: 0.0625rem solid var(--color-border);
    padding: var(--spacing-5) 0;
    flex-shrink: 0;
}

.footer-content {
    max-width: var(--container-max);
    margin: 0 auto;
    text-align: center;
    padding: 0 var(--spacing-5);
}

.icp-info {
    color: var(--color-text-tertiary);
    font-size: var(--text-xs);
}

.icp-info a:hover {
    color: var(--color-text-secondary);
}

.image-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-overlay);
    z-index: var(--z-modal);
    justify-content: center;
    align-items: center;
    cursor: zoom-out;
}

.image-modal .close-modal {
    position: absolute;
    top: var(--spacing-4);
    right: var(--spacing-4);
    color: #fff;
    font-size: var(--text-3xl);
    cursor: pointer;
    line-height: 1;
    transition: opacity var(--transition-fast);
}

.image-modal .close-modal:hover {
    opacity: 0.7;
}

.modal-image {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    border-radius: var(--radius-lg);
}

.qrcode-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-overlay);
    z-index: var(--z-modal);
    justify-content: center;
    align-items: center;
}

.qrcode-container1 {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    text-align: center;
    position: relative;
    max-width: 18rem;
    width: 90%;
}

.qrcode-container1 .close-modal {
    position: absolute;
    top: var(--spacing-2);
    right: var(--spacing-3);
    font-size: var(--text-xl);
    color: var(--color-text-tertiary);
    cursor: pointer;
    line-height: 1;
}

.qrcode-container1 .close-modal:hover {
    color: var(--color-text-primary);
}

.qrcode-image-wrapper {
    width: 10rem;
    height: 10rem;
    margin: 0 auto var(--spacing-3);
}

.qrcode-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-md);
}

.qrcode-tip {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.displayNone {
    display: none;
}

.displayBlock {
    display: block;
}