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

:root {
    --primary: #0a0e27;
    --secondary: #f0f4ff;
    --accent: #ef4444;
    --neutral: #ffffff;
    --text: #1a1a2e;
    --muted: #9ca3af;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text);
    background: url('beijing.jpg') center/cover no-repeat fixed;
    min-height: 100vh;
    line-height: 1.6;
    position: relative;
}

/* 移动设备使用不同的背景图片 */
@media (max-width: 768px) {
    body {
        background: url('beijing1.png') center/cover no-repeat fixed;
    }
}

/* Header */
header {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(0px);
    transition: backdrop-filter 0.4s ease;
    position: relative;
    z-index: 10;
}

header.header-blur {
    backdrop-filter: blur(12px);
}

/* Logo */
.logo {
    max-width: 120px;
    height: auto;
    display: block;
    transition: filter 0.5s ease;
    filter: drop-shadow(0 6px 16px rgba(0, 0, 0, 0.25));
    user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}

.logo:hover {
    filter: brightness(0) drop-shadow(0 8px 20px rgba(0, 0, 0, 0.5));
}

/* Header blur when logo is hovered */
header.logo-hover-blur {
    backdrop-filter: blur(12px);
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 999;
    padding: 1rem;
}

.modal {
    background: #0a0e27;
    color: #fff;
    padding: 2rem;
    border-radius: 14px;
    width: min(420px, 100%);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
    position: relative;
}

.modal h2 {
    margin: 0 0 1rem 0;
    letter-spacing: 1px;
    font-size: 1.4rem;
}

.modal .form-group {
    width: 100%;
    margin-bottom: 1rem;
}

.modal input[type="email"] {
    width: 100%;
    padding: 0.9rem 1rem;
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s ease, background 0.2s ease;
}

.modal input[type="email"]:focus {
    border-color: #ef4444;
    background: rgba(255, 255, 255, 0.12);
}

.modal .cta-button {
    width: 100%;
    text-align: center;
    margin-top: 0.5rem;
}

.modal .close {
    position: absolute;
    top: 12px;
    right: 12px;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.2rem;
    cursor: pointer;
}

/* Hero Section (hidden to let header stand center stage) */
.hero {
    display: none;
}

.hero p {
    font-size: 1rem;
    color: var(--muted);
    max-width: 550px;
    margin-bottom: 2rem;
    font-family: 'Inter', sans-serif;
}

/* Updated button with modern Gen Z style */
.cta-button {
    display: inline-block;
    padding: 0.75rem 2rem;
    background-color: var(--accent);
    color: var(--neutral);
    text-decoration: none;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
    text-transform: capitalize;
    transition: all 0.3s ease;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
    cursor: pointer;
}

.cta-button:hover {
    background-color: #dc2626;
    transform: translateY(-2px);
}

/* Gallery Section */
.gallery {
    padding: 4rem 2rem;
}

.gallery h2 {
    font-size: 1.75rem;
    margin-bottom: 2.5rem;
    letter-spacing: 0.5px;
    text-transform: lowercase;
    font-weight: 700;
    font-family: 'Inter', sans-serif;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.gallery-item {
    aspect-ratio: 1;
    background: linear-gradient(135deg, #ef4444 0%, #f87171 100%);
    position: relative;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.3s ease;
    border-radius: 8px;
}

.gallery-item:hover {
    transform: translateY(-4px);
}

.gallery-item-title {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1.5rem;
    background: rgba(10, 14, 39, 0.85);
    color: var(--neutral);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.gallery-item:hover .gallery-item-title {
    opacity: 1;
}

/* About Section */
.about {
    padding: 4rem 2rem;
    background-color: var(--secondary);
    max-width: 800px;
    margin: 0 auto;
    border-radius: 8px;
    margin: 3rem auto;
}

.about h2 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    letter-spacing: 0.5px;
    text-transform: lowercase;
    font-weight: 700;
    font-family: 'Inter', sans-serif;
}

.about p {
    font-size: 0.95rem;
    line-height: 1.7;
    color: #555;
    margin-bottom: 1.25rem;
    font-family: 'Inter', sans-serif;
}

/* Contact Section */
.contact {
    padding: 4rem 2rem;
    text-align: center;
    background-color: var(--neutral);
}

.contact h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    letter-spacing: 0.5px;
    text-transform: lowercase;
    font-weight: 700;
    font-family: 'Inter', sans-serif;
}

.contact-form {
    max-width: 450px;
    margin: 2rem auto;
}

.form-group {
    margin-bottom: 1.25rem;
    text-align: left;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    background-color: var(--secondary);
    transition: border-color 0.3s ease;
}

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

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* Footer */
footer {
    padding: 0.6rem 2rem;
    text-align: center;
    color: var(--neutral);
    position: relative;
    background: transparent;
    backdrop-filter: blur(0px);
    transition: backdrop-filter 0.4s ease;
}

footer.blurred {
    backdrop-filter: blur(18px);
    background: transparent;
}

.social-links {
    margin: 1.5rem 0;
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

.social-links a {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
    transition: color 0.3s ease;
    text-transform: lowercase;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
}

.social-links a:hover {
    color: var(--neutral);
}

footer p {
    font-size: 0.5rem;
    color: #9ca3af;
    margin-top: 1rem;
    font-family: 'JetBrains Mono', monospace;
}

/* Responsive */
@media (max-width: 768px) {
    header {
        padding: 1.5rem;
    }

    .hero {
        padding: 2.5rem 1.5rem;
        min-height: auto;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .gallery {
        padding: 3rem 1.5rem;
    }

    .gallery-grid {
        grid-template-columns: 1fr;
    }

    .about,
    .contact {
        padding: 3rem 1.5rem;
    }
}