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

:root {
    /* BLUE AZURE 暗色主题 */
    --primary-color: #0ea5e9;
    --primary-light: #38bdf8;
    --primary-dark: #0284c7;

    /* 暗色主题色彩 */
    --bg-primary: #000000;
    --text-primary: #ffffff;
    --text-secondary: #e5e7eb;

    /* 字体 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* 间距 */
    --container-max-width: 1200px;

    /* 动画 */
    --transition: all 0.3s ease;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
    min-height: 100vh;
}

/* 背景视频 */
.background-video {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1;
    pointer-events: none;
    opacity: 0.8;
}

/* 容器 */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: transparent;
    z-index: 1000;
    height: 80px;
    transition: var(--transition);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-top: 2rem;
    text-decoration: none;
}

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.5));
}

.logo-text {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text-primary);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.cta-button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.35rem 1rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.875rem;
    margin-top: 2rem;
    cursor: pointer;
    transition: var(--transition);
}

.cta-button:hover {
    background: var(--primary-light);
    transform: translateY(-1px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* 主要内容区域 */
.main-content {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 80px 0;
    position: relative;
    z-index: 1;
}

.hero-section {
    text-align: center;
    max-width: 800px;
}

.hero-icon {
    margin-bottom: 3rem;
}

.triangle-icon {
    font-size: 4rem;
    color: var(--primary-color);
    display: inline-block;
    animation: pulse 2s ease-in-out infinite;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.hero-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    line-height: 1.2;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
    font-size: 2.2rem;
    color: var(--text-primary);
    font-weight: 400;
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

/* 标题中的logo图标 */
.hero-title .logo-img {
    height: 3.5rem;
    width: auto;
    object-fit: contain;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.5));
    flex-shrink: 0;
}

/* 动画 */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container,
    .nav-container {
        padding: 0 1rem;
    }

    .nav-menu {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 2.2rem;
    }

    .triangle-icon {
        font-size: 3rem;
    }

    .hero-icon {
        margin-bottom: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 2.2rem;
    }

    .triangle-icon {
        font-size: 2.5rem;
    }

    .cta-button {
        padding: 0.625rem 1.25rem;
        font-size: 0.8rem;
    }

    .logo-img {
        height: 32px;
    }

    .hero-section {
        padding: 1.5rem;
        margin: 0 1rem;
    }

    .hero-title .logo-img {
        height: 2.5rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 2.2rem;
    }

    .hero-title .logo-img {
        height: 2rem;
    }

    .hero-title {
        gap: 0.75rem;
    }
}

/* 备案信息样式 */
.icp-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1rem 0;
    z-index: 100;
}

.icp-text {
    text-align: center;
    margin: 0;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.icp-item {
    white-space: nowrap;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.icp-copy-icon {
    height: 1rem;
    width: auto;
    object-fit: contain;
    flex-shrink: 0;
    display: block;
}

@media (max-width: 768px) {
    .icp-text {
        flex-direction: column;
        gap: 0.25rem;
        font-size: 0.7rem;
    }

    .icp-footer {
        padding: 0.5rem 0;
    }
}

@media (max-width: 480px) {
    .icp-text {
        font-size: 0.65rem;
        gap: 0.2rem;
    }

    .icp-item {
        font-size: 0.6rem;
    }

    .icp-copy-icon {
        height: 1rem;
        width: 1rem;
    }
}