/* 全局变量与重置 */
:root {
    --primary-color: #e10600; /* F1 Red */
    --secondary-color: #ff4500;
    --dark-bg: #111111;
    --darker-bg: #0a0a0a;
    --light-text: #f4f4f4;
    --gray-text: #aaaaaa;
    --accent-color: #00d2ff;
    --font-main: 'Noto Sans SC', sans-serif;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--dark-bg);
    color: var(--light-text);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 50px;
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.navbar.scrolled {
    padding: 15px 50px;
    background: rgba(10, 10, 10, 0.98);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.5);
}

.logo {
    font-size: 1.8rem;
    font-weight: 900;
    letter-spacing: 2px;
    color: var(--light-text);
    font-style: italic;
}

.logo span {
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-links a {
    font-weight: 700;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition);
    position: relative;
}

.nav-links a:not(.btn-nav)::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-links a:not(.btn-nav):hover::after {
    width: 100%;
}

.nav-links a:hover {
    color: var(--primary-color);
}

.btn-nav {
    background: var(--primary-color);
    padding: 10px 25px;
    border-radius: 30px;
    color: white !important;
    font-weight: 700;
    box-shadow: 0 4px 15px rgba(225, 6, 0, 0.4);
}

.btn-nav:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(225, 6, 0, 0.6);
}

.hamburger {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* 首屏 */
.hero {
    height: 100vh;
    background: url('https://images.unsplash.com/photo-1534438327276-14e5300c3a48?q=80&w=2070&auto=format&fit=crop') center/cover no-repeat;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 80px;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(10,10,10,0.7) 0%, rgba(10,10,10,0.9) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: 0 20px;
}

.badge {
    display: inline-block;
    background: rgba(225, 6, 0, 0.2);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 8px 20px;
    border-radius: 30px;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 20px;
    text-transform: uppercase;
    font-size: 0.9rem;
}

.hero h1 {
    font-size: 4.5rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 2px;
    background: linear-gradient(45deg, #fff, #aaa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.subtitle {
    font-size: 1.5rem;
    color: var(--gray-text);
    margin-bottom: 40px;
    font-weight: 300;
}

.event-details {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 50px;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    background: rgba(255,255,255,0.05);
    padding: 10px 20px;
    border-radius: 8px;
    border-left: 3px solid var(--primary-color);
}

.detail-item i {
    color: var(--primary-color);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 15px 40px;
    font-size: 1.2rem;
    font-weight: 700;
    border-radius: 50px;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition);
    box-shadow: 0 10px 30px rgba(225, 6, 0, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 40px rgba(225, 6, 0, 0.6);
}

/* 通用区块样式 */
section {
    padding: 100px 0;
}

.section-header {
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 15px;
}

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

.divider {
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
}

.divider.center {
    margin: 0 auto 20px;
}

/* 活动概览 */
.overview {
    background-color: var(--darker-bg);
}

.overview-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.overview-text h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--light-text);
}

.overview-text p {
    color: var(--gray-text);
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.benefits {
    margin-top: 30px;
}

.benefits li {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
    font-size: 1.1rem;
    color: #ddd;
}

.benefits i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

.overview-image {
    position: relative;
}

.overview-image::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    width: 100%;
    height: 100%;
    border: 2px solid var(--primary-color);
    z-index: 0;
    border-radius: 10px;
}

.overview-image img {
    width: 100%;
    border-radius: 10px;
    position: relative;
    z-index: 1;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}

/* 行程安排 */
.itinerary {
    background: linear-gradient(to bottom, var(--dark-bg), var(--darker-bg));
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 20px;
    height: 100%;
    width: 2px;
    background: rgba(255,255,255,0.1);
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: 50px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: 11px;
    top: 5px;
    width: 20px;
    height: 20px;
    background: var(--dark-bg);
    border: 3px solid var(--primary-color);
    border-radius: 50%;
    z-index: 2;
    box-shadow: 0 0 10px var(--primary-color);
}

.timeline-date {
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 1.1rem;
    letter-spacing: 1px;
}

.timeline-content {
    background: rgba(255,255,255,0.03);
    padding: 30px;
    border-radius: 10px;
    border: 1px solid rgba(255,255,255,0.05);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateX(10px);
    background: rgba(255,255,255,0.05);
    border-color: rgba(225, 6, 0, 0.3);
}

.timeline-content h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
}

.timeline-content p {
    color: var(--gray-text);
}

/* 活动亮点 */
.highlights {
    background-color: var(--darker-bg);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.card {
    background: rgba(255,255,255,0.02);
    border-radius: 15px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.05);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    border-color: rgba(225, 6, 0, 0.3);
}

.card-img {
    height: 250px;
    overflow: hidden;
}

.card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.card:hover .card-img img {
    transform: scale(1.1);
}

.card-content {
    padding: 30px;
}

.card-content h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--light-text);
}

.card-content p {
    color: var(--gray-text);
    font-size: 1rem;
}

/* 报名表单 */
.rsvp {
    background: url('https://images.unsplash.com/photo-1504707748692-419802cf939d?q=80&w=2047&auto=format&fit=crop') center/cover no-repeat;
    position: relative;
}

.rsvp::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10,10,10,0.85);
    backdrop-filter: blur(5px);
}

.rsvp-wrapper {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    background: rgba(20, 20, 20, 0.8);
    padding: 50px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 30px 60px rgba(0,0,0,0.5);
}

.rsvp-info h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--light-text);
}

.rsvp-info p {
    color: var(--gray-text);
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.rsvp-info strong {
    color: var(--primary-color);
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
    color: #ddd;
}

.contact-info i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

.rsvp-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: flex;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group.half {
    flex: 1;
}

label {
    font-size: 0.9rem;
    font-weight: 700;
    color: #ccc;
    letter-spacing: 1px;
}

input, select, textarea {
    width: 100%;
    padding: 15px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 8px;
    color: white;
    font-family: var(--font-main);
    font-size: 1rem;
    transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255,255,255,0.08);
}

select option {
    background: var(--darker-bg);
    color: white;
}

.btn-submit {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 18px;
    font-size: 1.1rem;
    font-weight: 700;
    border-radius: 8px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition);
    margin-top: 10px;
}

.btn-submit:hover {
    background: var(--secondary-color);
    box-shadow: 0 10px 20px rgba(225, 6, 0, 0.4);
}

/* 页脚 */
footer {
    background: #050505;
    padding: 40px 0;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 900;
    font-style: italic;
}

.footer-logo span {
    color: var(--primary-color);
}

footer p {
    color: var(--gray-text);
    font-size: 0.9rem;
}

.social-links {
    display: flex;
    gap: 20px;
}

.social-links a {
    color: var(--gray-text);
    font-size: 1.5rem;
    transition: var(--transition);
}

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

/* 响应式设计 */
@media (max-width: 992px) {
    .hero h1 {
        font-size: 3.5rem;
    }
    .overview-content {
        grid-template-columns: 1fr;
    }
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    .rsvp-wrapper {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 20px;
    }
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--darker-bg);
        flex-direction: column;
        justify-content: center;
        transition: 0.5s;
    }
    .nav-links.active {
        left: 0;
    }
    .hamburger {
        display: block;
    }
    .hero h1 {
        font-size: 2.5rem;
    }
    .event-details {
        flex-direction: column;
        gap: 15px;
    }
    .grid-3 {
        grid-template-columns: 1fr;
    }
    .form-row {
        flex-direction: column;
    }
    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}