:root {
    --mint-soft: #D1F2EB;
    --mint-gradient: linear-gradient(135deg, #E0F7F1 0%, #B2EBF2 100%);
    --mocha: #8D7765;
    /* Lighter, warmer brown */
    --mocha-light: #B4A295;
    --cream: #FFFDF7;
    --butter: #FEF9E1;
    /* Creamy Yellow / 奶黄色 */

    --primary: var(--mocha);
    --secondary: var(--mocha-light);
    --background: var(--mint-soft);
    --text: #5D4A3E;
    /* Soft chocolate text */
    --text-muted: #8D7765;
    --glass: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(141, 119, 101, 0.2);
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

body {
    background-color: var(--mint-soft);
    background-image:
        var(--mint-gradient),
        /* Subtle sparkles/stars pattern */
        radial-gradient(circle at 10% 10%, rgba(255, 255, 255, 0.8) 1px, transparent 1px),
        radial-gradient(circle at 90% 85%, rgba(141, 119, 101, 0.1) 2px, transparent 2px),
        /* Add soft buttery blobs in background */
        radial-gradient(circle at 80% 20%, var(--butter) 0%, transparent 40%),
        radial-gradient(circle at 20% 70%, var(--butter) 0%, transparent 35%);
    background-size: cover, 60px 60px, 80px 80px, 100%, 100%;
    color: var(--text);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
}

/* Header & Nav */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    backdrop-filter: blur(15px);
    background: rgba(255, 255, 255, 0.7);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(45deg, var(--mocha), #5D4A3E);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.lang-switch {
    background: rgba(139, 92, 246, 0.2);
    border: 1px solid var(--primary);
    color: var(--text);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.lang-switch:hover {
    background: var(--primary);
}

[lang="en"] {
    display: none;
}

body.lang-en [lang="zh-CN"] {
    display: none !important;
}

body.lang-en [lang="en"] {
    display: inline !important;
}

body:not(.lang-en) [lang="en"] {
    display: none !important;
}

body:not(.lang-en) [lang="zh-CN"] {
    display: inline !important;
}

div[lang="en"],
p[lang="en"],
h1[lang="en"],
h2[lang="en"],
h3[lang="en"] {
    display: none;
}

body.lang-en div[lang="en"],
body.lang-en p[lang="en"],
body.lang-en h1[lang="en"],
body.lang-en h2[lang="en"],
body.lang-en h3[lang="en"] {
    display: block !important;
}

body:not(.lang-en) div[lang="en"],
body:not(.lang-en) p[lang="en"],
body:not(.lang-en) h1[lang="en"],
body:not(.lang-en) h2[lang="en"],
body:not(.lang-en) h3[lang="en"] {
    display: none !important;
}

body:not(.lang-en) div[lang="zh-CN"],
body:not(.lang-en) p[lang="zh-CN"],
body:not(.lang-en) h1[lang="zh-CN"],
body:not(.lang-en) h2[lang="zh-CN"],
body:not(.lang-en) h3[lang="zh-CN"] {
    display: block !important;
}

body.lang-en div[lang="zh-CN"],
body.lang-en p[lang="zh-CN"],
body.lang-en h1[lang="zh-CN"],
body.lang-en h2[lang="zh-CN"],
body.lang-en h3[lang="zh-CN"] {
    display: none !important;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 80px;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.profile-img {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 6px solid white;
    margin-bottom: 2rem;
    box-shadow: 0 10px 30px rgba(141, 119, 101, 0.15);
    animation: zoomIn 1s ease-out;
    transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.5s ease;
}

.profile-img:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 0 50px var(--primary);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 900;
    margin-bottom: 1rem;
    letter-spacing: -1px;
    animation: fadeInDown 1s ease-out;
}

.hero h2 {
    font-size: 1.5rem;
    color: var(--secondary);
    margin-bottom: 1.5rem;
    font-weight: 600;
    animation: fadeInUp 1s ease-out 0.1s backwards;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 2rem;
    animation: fadeInUp 1s ease-out 0.2s backwards;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(62, 180, 137, 0.1);
    color: var(--primary);
    border: 1px solid rgba(62, 180, 137, 0.2);
    border-radius: 4px;
    font-size: 0.8rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.gradient-text {
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Glass Card */
.glass-card {
    background: var(--glass);
    backdrop-filter: blur(8px);
    border: 1px solid var(--cream);
    border-radius: 30px;
    padding: 2.5rem;
    box-shadow: 0 10px 40px rgba(141, 119, 101, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 50px rgba(141, 119, 101, 0.15);
}

/* Sections */
section {
    padding: 100px 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 4rem;
    position: relative;
    color: var(--mocha);
}

/* Flowing Ribbon Bow Style */
.ribbon-bow {
    position: absolute;
    width: 80px;
    height: auto;
    z-index: 5;
    pointer-events: none;
    opacity: 0.9;
    filter: drop-shadow(0 2px 4px rgba(141, 119, 101, 0.1));
}

.ribbon-bow svg {
    width: 100%;
    height: auto;
}

/* Positioning for different use cases */
.card-ribbon {
    top: -20px;
    right: -10px;
    transform: rotate(15deg);
}

.title-ribbon {
    top: -60px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
}

/* Floating background ribbons */
.bg-ribbon {
    position: fixed;
    width: 150px;
    z-index: -1;
    opacity: 0.15;
    animation: float 15s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0) rotate(0);
    }

    50% {
        transform: translateY(-30px) rotate(10deg);
    }
}

.section-title::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background: var(--mocha-light);
    margin: 1.5rem auto 0;
    border-radius: 10px;
}

/* Grid Layouts */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--mocha);
    color: white;
    box-shadow: 0 4px 15px rgba(141, 119, 101, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-primary:hover {
    transform: scale(1.05);
    background: var(--mocha-light);
    box-shadow: 0 6px 20px rgba(141, 119, 101, 0.3);
}

/* Animations */
@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .nav-links li:not(:last-child) {
        display: none;
    }

    .nav-links li:last-child {
        display: block;
    }
}

/* Video Showcase Custom Styles */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
}

.video-card {
    padding: 1.5rem !important;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.video-wrapper {
    position: relative;
    width: 100%;
    max-width: 360px; /* 限制竖屏视频的最大宽度 */
    margin: 0 auto 1.5rem; /* 居中显示 */
    aspect-ratio: 9 / 16; /* 竖屏比例 */
    background: #000;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.video-wrapper video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

.video-card:hover .video-wrapper video {
    transform: scale(1.02);
}

.video-info h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

@media (max-width: 480px) {
    .video-grid {
        grid-template-columns: 1fr;
    }

    .video-card {
        padding: 1rem !important;
    }
}