:root {
    --primary-red: #e63946;
    --dark-red: #c1121f;
    --light-red: #ff6b6b;
    --white: #ffffff;
    --off-white: #f8f9fa;
    --dark: #1a1a2e;
    --gray: #6c757d;
    --light-gray: #dee2e6;
}

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

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: var(--white);
    color: var(--dark);
    line-height: 1.6;
    overflow-x: hidden;
}

.diamond-bg {
    background-image:
        linear-gradient(135deg, rgba(230, 57, 70, 0.03) 25%, transparent 25%),
        linear-gradient(225deg, rgba(230, 57, 70, 0.03) 25%, transparent 25%),
        linear-gradient(45deg, rgba(230, 57, 70, 0.03) 25%, transparent 25%),
        linear-gradient(315deg, rgba(230, 57, 70, 0.03) 25%, transparent 25%);
    background-size: 40px 40px;
    background-position: 0 0, 20px 0, 20px -20px, 0px 20px;
}

header {
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--dark-red) 100%);
    color: var(--white);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(230, 57, 70, 0.3);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo::before {
    content: '◆';
    font-size: 1.5rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    position: relative;
}

nav a:hover {
    background: rgba(255,255,255,0.2);
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--white);
    transition: all 0.3s;
    transform: translateX(-50%);
}

nav a:hover::after {
    width: 80%;
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 2rem 80px;
    background:
        linear-gradient(135deg, rgba(230, 57, 70, 0.1) 0%, rgba(255, 255, 255, 0.9) 50%, rgba(230, 57, 70, 0.05) 100%),
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60' viewBox='0 0 60 60'%3E%3Cpath d='M30 0 L60 30 L30 60 L0 30 Z' fill='none' stroke='%23e63946' stroke-width='0.5' opacity='0.1'/%3E%3C/svg%3E");
    background-size: cover, 60px 60px;
}

.hero-content {
    max-width: 900px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--dark-red) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
}

.hero p {
    font-size: 1.3rem;
    color: var(--gray);
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--dark-red) 100%);
    color: var(--white);
    text-decoration: none;
    border-radius: 50px;
    font-weight: bold;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(230, 57, 70, 0.4);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(230, 57, 70, 0.5);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-red);
    color: var(--primary-red);
    box-shadow: none;
    margin-left: 1rem;
}

.btn-outline:hover {
    background: var(--primary-red);
    color: var(--white);
}

.section {
    padding: 100px 2rem;
}

.section-dark {
    background: var(--dark);
    color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-title h2::before {
    content: '◆';
    margin-right: 0.5rem;
    color: var(--primary-red);
}

.section-title p {
    color: var(--gray);
    font-size: 1.1rem;
}

.section-dark .section-title p {
    color: rgba(255,255,255,0.7);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.service-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0,0,0,0.08);
    transition: all 0.3s;
    border: 1px solid var(--light-gray);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(230, 57, 70, 0.15);
    border-color: var(--primary-red);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--dark-red) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
}

.service-card h3 {
    color: var(--dark);
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.service-card p {
    color: var(--gray);
    line-height: 1.8;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--primary-red);
}

.about-text p {
    margin-bottom: 1.5rem;
    color: var(--gray);
    font-size: 1.1rem;
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-red);
    display: block;
}

.stat-label {
    color: var(--gray);
    font-size: 0.9rem;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.product-card {
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0,0,0,0.08);
    transition: all 0.3s;
    border: 1px solid var(--light-gray);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(230, 57, 70, 0.15);
}

.product-image {
    height: 220px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--primary-red);
    position: relative;
    overflow: hidden;
}

.product-image::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40' viewBox='0 0 40 40'%3E%3Cpath d='M20 0 L40 20 L20 40 L0 20 Z' fill='none' stroke='%23e63946' stroke-width='0.5' opacity='0.2'/%3E%3C/svg%3E");
}

.product-content {
    padding: 1.5rem;
}

.product-content h3 {
    margin-bottom: 0.8rem;
    color: var(--dark);
    font-size: 1.3rem;
}

.product-content p {
    color: var(--gray);
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.product-price {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-red);
    margin-bottom: 1rem;
}

.product-features {
    background: var(--off-white);
    padding: 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--gray);
    white-space: pre-line;
}

.contact-section {
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--dark-red) 100%);
    color: var(--white);
    padding: 80px 2rem;
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.contact-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.1rem;
}

.contact-item::before {
    content: '◆';
    color: rgba(255,255,255,0.7);
}

footer {
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--dark-red) 100%);
    color: var(--white);
    padding: 3rem 2rem;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.footer-logo::before {
    content: '◆';
    color: var(--white);
}

.footer-links {
    margin: 1.5rem 0;
}

.footer-links a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    margin: 0 1rem;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: rgba(255,255,255,0.9);
}

.footer-copyright {
    color: rgba(255,255,255,0.5);
    font-size: 0.9rem;
}

.admin-container {
    max-width: 1000px;
    margin: 120px auto 40px;
    padding: 2rem;
    background: var(--white);
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--light-gray);
}

.admin-header h2 {
    color: var(--primary-red);
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1.5rem;
}

.admin-table th,
.admin-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--light-gray);
}

.admin-table th {
    background: var(--off-white);
    color: var(--dark);
    font-weight: 600;
}

.admin-table tr:hover {
    background: rgba(230, 57, 70, 0.05);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--dark);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid var(--light-gray);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-red);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

.login-container {
    max-width: 400px;
    margin: 150px auto;
    padding: 3rem;
    background: var(--white);
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    text-align: center;
}

.login-container h2 {
    color: var(--primary-red);
    margin-bottom: 2rem;
}

.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .stats {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .contact-info {
        flex-direction: column;
        gap: 1.5rem;
    }

    .admin-container {
        margin: 100px 1rem 20px;
        padding: 1rem;
    }

    .admin-table {
        font-size: 0.85rem;
    }

    .admin-table th,
    .admin-table td {
        padding: 0.5rem;
    }
}