/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg: #78A2D2;
    --color-text: #1a1a1a;
    --color-text-light: #4a4a4a;
    --color-accent: #2c2c2c;
    --color-border: #e0e0e0;
    --color-link: #3a3a3a;
    --color-link-hover: #000000;
    --spacing-xs: 0.75rem;
    --spacing-sm: 1.5rem;
    --spacing-md: 3rem;
    --spacing-lg: 5rem;
    --spacing-xl: 8rem;
    --spacing-xxl: 10rem;
    --max-width: 1200px;
    --font-body: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', 'Roboto', 'Helvetica Neue', 'Arial', sans-serif;
    --font-heading: -apple-system, BlinkMacSystemFont, 'Inter', 'SF Pro Display', 'Segoe UI', 'Roboto', 'Helvetica Neue', 'Arial', sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'Source Code Pro', monospace;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.85;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-weight: 400;
}

/* Typography */
h1, h2, h3 {
    font-family: var(--font-heading);
    font-weight: 300;
    letter-spacing: -0.02em;
}

h1 {
    font-size: 2.5rem;
    line-height: 1.25;
    margin-bottom: var(--spacing-lg);
    margin-top: 0;
    letter-spacing: -0.03em;
}

h2 {
    font-size: 2rem;
    line-height: 1.35;
    margin-bottom: var(--spacing-lg);
    margin-top: 0;
    letter-spacing: -0.02em;
}

h3 {
    font-size: 1.25rem;
    font-weight: 300;
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-lg);
    letter-spacing: -0.01em;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-light);
    line-height: 1.9;
    font-size: 1.125rem;
    text-align: justify;
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: color 0.25s ease-in-out, border-bottom-color 0.25s ease-in-out;
    border-bottom: 1px solid transparent;
}

a:hover {
    color: var(--color-link-hover);
    border-bottom-color: var(--color-link-hover);
}

/* Header and Navigation */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: transparent;
    backdrop-filter: none;
    border-bottom: none;
    z-index: 100;
    padding: 0.5rem 0;
    height: 90px;
    line-height: 60px;
    transition: background-color 0.2s ease-in-out, border-bottom-color 0.2s ease-in-out;
}
header a {
    font-weight: 600; 
    color: white;
    text-transform: capitalize;
    text-decoration: none;
    transition: color 0.3s ease;
}
header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}
header.scrolled a {
    color: black;
}

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

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

nav {
    display: flex;
    align-items: center;
}

nav ul {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    list-style: none;
    padding: 0;
    margin: 0;
    flex-wrap: nowrap;
}

nav a {
    font-size: 1.1rem;
    text-transform: capitalize;
    letter-spacing: 0.05em;
    padding: var(--spacing-sm) var(--spacing-xs);
    border-bottom: 1px solid transparent;
    transition: color 0.25s ease-in-out, border-bottom-color 0.25s ease-in-out;
}

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

    max-width: 100%;
    margin: 0 auto;
    padding: 12px 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;

    text-decoration: none;
    font-weight: 600;
}

.nav-avatar {
    width: 36px; 
    height: 36px; 
    max-width: 36px;
    max-height: 36px;

    border-radius: 50%;
    object-fit: cover;
    display: block;
}

.brand-name {
    font-size: 1rem;
    letter-spacing: 0.05em;
    text-transform: capitalize;
    color: white;
}

header.scrolled .brand-name {
    color: black;
}

nav a:hover {
    color: var(--color-link-hover);
    border-bottom-color: var(--color-link-hover);
}

.lang-switcher {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-left: var(--spacing-sm);
}

.lang-switcher button {
    font-family: var(--font-body);
    font-size: 0.85rem;
    background: none;
    border: none;
    color: var(--color-text-light);
    cursor: pointer;
    padding: var(--spacing-xs) var(--spacing-sm);
    text-transform: none;
    letter-spacing: 0.02em;
    transition: color 0.2s ease-in-out;
    border-radius: 2px;
}

.lang-switcher button:hover {
    color: var(--color-text);
}

.lang-switcher button.active {
    color: var(--color-text);
    font-weight: 500;
}

.lang-sep {
    color: var(--color-border);
    font-weight: 300;
    user-select: none;
}

/* Main Content */
main {
    max-width: 100%;
    margin: 0;
    padding: 0;
}

section {
    margin-bottom: var(--spacing-xxl);
    scroll-margin-top: 100px;
    padding-top: var(--spacing-md);
    transition: opacity 0.3s ease-in-out;
}

section:not(.hero):not(.irregular-section) {
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: 1rem;
    padding-right: 1rem;
}

/* Hero Section */
.hero {
    width: 100%;
    margin: 0;
    padding: 0;
    border-bottom: none;
}

.hero-btn {
    display: inline-block;
    margin-top: 2rem;

    padding: 0.9rem 2.2rem;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;

    color: #ffffff;
    border: 1.5px solid rgba(255, 255, 255, 0.8);
    border-radius: 999px;
    background: transparent;

    transition: all 0.3s ease;
}

.hero-btn:hover {
    background-color: #ffffff;
    color: #000000;
    transform: translateY(-2px);
}

.cta-btn {
    display: inline-block;
    margin-top: 32px;

    padding: 14px 36px;
    font-size: 16px;
    font-weight: 500;
    letter-spacing: 0.5px;

    color: #fff;
    background: linear-gradient(135deg, #80aef9);
    border-radius: 999px;
    text-decoration: none;

    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.35);

    animation: breathe 3s ease-in-out infinite;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

@keyframes breathe {
    0% {
        transform: scale(1);
        box-shadow: 0 10px 30px rgba(37, 99, 235, 0.35);
    }
    50% {
        transform: scale(1.06);
        box-shadow: 0 18px 45px rgba(37, 99, 235, 0.55);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 10px 30px rgba(37, 99, 235, 0.35);
    }
}

html {
    scroll-behavior: smooth;
}

.banner {
    position: relative;
    width: 100%;
    min-height: 100vh;
    background-image: url('images/banner2.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}


.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.5) 100%);
    backdrop-filter: blur(0.5px);
    z-index: 1;
}

.banner-content {
    position: absolute;
    top: 50%;
    left: 5%;
    z-index: 2;
    transform: translate(0, -50%);
    text-align: left;
    padding: var(--spacing-xxl) var(--spacing-lg);
    max-width: 100%;
    margin: 0 auto;
    color: #ffffff;
}

.avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto var(--spacing-lg);
    display: block;
    border: 2px solid rgba(255, 255, 255, 0.25);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
    transition: transform 0.25s ease-in-out, box-shadow 0.25s ease-in-out, border-color 0.25s ease-in-out;
}

.avatar:hover {
    transform: scale(1.02);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
    border-color: rgba(255, 255, 255, 0.35);
}

.banner-content h1 {
    color: #ffffff;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
    font-weight: 600;
    font-size: 3rem;
}

.intro {
    font-size: 2rem;
    max-width: 600px;
    margin: 0 auto;
    color: rgba(255, 255, 255, 0.92);
    line-height: 1.9;
    font-weight: 400;
    text-shadow: 0 1px 6px rgba(0, 0, 0, 0.3);
    letter-spacing: 0.01em;
}

/* About Section */
.content {
    max-width: 1000px;
    padding: var(--spacing-sm) 0;
}

.skills-list {
    list-style: none;
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.skills-list li {
    padding: var(--spacing-sm) 0;
    padding-left: 2rem;
    position: relative;
    color: var(--color-text-light);
    line-height: 1.9;
    transition: color 0.2s ease-in-out, padding-left 0.2s ease-in-out;
}

.skills-list li:hover {
    color: var(--color-text);
    padding-left: 2.25rem;
}

.skills-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    transition: color 0.2s ease-in-out, transform 0.2s ease-in-out;
}

.skills-list li:hover::before {
    color: var(--color-text);
    transform: translateX(2px);
}

.about-container {
    display: flex;
    align-items: center;
    gap: 90px;
    position: relative;
    z-index: 1;
    width: 100%;
}

.about-image {
    flex: 0 0 50%;
}

.about-image img {
    width: 80%;
    height: 80%;
    border-radius: 15px;
    object-fit: cover;
}

.about-text {
    flex: 0 0 50%;
    margin-left: auto;
}

.about-text h1 {
    font-size: 48px;
    font-weight: 600;
    margin-bottom: 24px;
    color:#ffffff;
}

.about-text p {
    font-size: 1.125rem;
    line-height: 1.7;
    color: #ffffff;
    text-align: justify;
}

.experience-timeline {
    margin-top: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 0;
  }
  
  .exp-item {
    max-width: 680px;
  }
  
  /* 时间 + 地点同一行 */
  .exp-header {
    display: grid;
    grid-template-columns: 160px 1fr;
    align-items: baseline;
    margin-bottom: 0.3rem;
}
  
  /* 时间 */
  .exp-time {
    font-size: 0.95rem;
    color: #ffffff;
    letter-spacing: 0.04em;
    white-space: nowrap;
  }
  
  /* 学校 / 公司 */
  .exp-place {
    font-size: 1.05rem;
    font-weight: 600;
    color: #ffffff;
    flex-wrap: nowrap;
  }
  
  /* 描述 */
  .exp-desc {
    grid-column: 2;  
    font-size: 1.125rem;
    line-height: 1.6;
    color: #ffffff;
    text-align: justify;
    margin-left: 0; 
    flex-wrap: nowrap/* 视觉对齐时间 */
  }
  
  /* 标签 */
  .exp-tags {
    margin-top: 0.4rem;
    margin-left: calc(0.1rem * 7);
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-weight: 400;
  }
  
  .exp-tags span {
    padding: 0.3rem 0.5rem;
    border-radius: 999px;
    background: #FFEC89;
    color: #1775e0;
    font-size: 0.8rem;
  }

  .irregular-section {
    position: relative;
    z-index: 10;

    width: 99.45vw;
    max-width: none;
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);

    margin-top: 0px;
    padding-top: 10px;

    background-color: #ffffff;
}

.irregular-section::before {
    content: "";
    position: absolute;
    top: -110px;
    left: 0;
    width: 100%;
    height: 160px;

    background-color: #ffffff;

    clip-path: polygon(
    0 15%,
    5% 10%,
    10% 18%,
    15% 6%,
    20% 20%,
    25% 12%,
    30% 18%,
    35% 8%,
    40% 22%,
    45% 10%,
    50% 18%,
    55% 7%,
    60% 20%,
    65% 12%,
    70% 18%,
    75% 8%,
    80% 22%,
    85% 10%,
    90% 18%,
    95% 12%,
    100% 16%,
    100% 100%,
    0 100%
  );
}


/* 底部不规则形状 */
.irregular-section::after {
    content: "";
    position: absolute;
    bottom: -200px;  /* 向下突出 */
    left: 0;
    width: 100%;
    height: 200px;   /* 控制波浪高度 */

    background-color: #ffffff;

    clip-path: polygon(
        0 0,                /* 左下角 */
        100% 0,             /* 右下角 */
        100% 84%,           /* 右下角开始起伏 - 对应顶部的 100% 16% 翻转 */
        95% 88%,            /* 对应顶部 95% 12% 翻转 (100% - 12% = 88%) */
        90% 82%,            /* 对应顶部 90% 18% 翻转 */
        85% 90%,            /* 对应顶部 85% 10% 翻转 */
        80% 78%,            /* 对应顶部 80% 22% 翻转 */
        75% 92%,            /* 对应顶部 75% 8% 翻转 */
        70% 82%,            /* 对应顶部 70% 18% 翻转 */
        65% 88%,            /* 对应顶部 65% 12% 翻转 */
        60% 80%,            /* 对应顶部 60% 20% 翻转 */
        55% 93%,            /* 对应顶部 55% 7% 翻转 */
        50% 82%,            /* 对应顶部 50% 18% 翻转 */
        45% 90%,            /* 对应顶部 45% 10% 翻转 */
        40% 78%,            /* 对应顶部 40% 22% 翻转 */
        35% 92%,            /* 对应顶部 35% 8% 翻转 */
        30% 82%,            /* 对应顶部 30% 18% 翻转 */
        25% 88%,            /* 对应顶部 25% 12% 翻转 */
        20% 80%,            /* 对应顶部 20% 20% 翻转 */
        15% 94%,            /* 对应顶部 15% 6% 翻转 */
        10% 82%,            /* 对应顶部 10% 18% 翻转 */
        5% 90%,             /* 对应顶部 5% 10% 翻转 */
        0 85%
    );
    
}

.irregular-container {
    max-width: 90%;
    margin: 0 auto;
    padding: 0 1rem;
    position: relative;
    z-index: 2;
}

.irregular-container h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 500;
    color: #012f5d;
}

.experience-block {
    min-height: 100vh;
    align-items: center;
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
    margin: 6rem 0;
  }

.experience-text {
    align-self: start;
}

.experience-text P {
    font-weight: 400;
    font-size: 1.125rem;
    text-align: justify;
}

.experience-media {
    position: relative;
    grid-template-columns: 1fr 1fr;  /* 两列 */
    gap: 1.5rem;
    width: 100%;
    height: 100vh;          /* 和页面同高 */
    overflow: hidden;       /* 只在右侧滚动 */
    padding-right: 1rem;    /* 给滚动条留空间 */

    mask-image: linear-gradient(
    to bottom,
    transparent 0%,
    black 12%,
    black 88%,
    transparent 100%
  );

  -webkit-mask-image: linear-gradient(
    to bottom,
    transparent 0%,
    black 12%,
    black 88%,
    transparent 100%
  );
}
  
.media-track {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  
    padding-top: 60vh;
    padding-bottom: 60vh;
  
    will-change: transform; /* 提高滚动动画性能 */
  }

.media-column.left {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: -50rem
}
  
  /* 右列错位一点，更有节奏 */
.media-column.right {
    margin-top: -40rem;
}

.masonry {
    column-gap: 1.5rem;
}
  
.masonry img {
    width: 100%;
    height: auto;
    display: block;
    margin-bottom: 0.5rem;
    border-radius: 12px;
    break-inside: avoid;
    object-fit: cover;
}
.experience-title {
    font-weight: 500;
    font-size: 3rem;
    margin-bottom: 1rem;
    text-transform: capitalize; /* 可选 */
    color: #012f5d;
}

.experience-text {
    margin-top: 4rem;
}
   
 
.showcase {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    height: 100vh;
    align-items: center;
    padding: 5rem;
    background: #faf9f6;
    overflow: hidden;  
    border-radius: 3% 3% 3% 3%;
    margin-top: 12rem;
}

.showcase-container {
    position: relative;
    height: 100%;
}
  
.arc-bg {
    position: absolute;
  
    width: 1000px;
    height: 1000px;
    border-radius: 50%;
    background: linear-gradient(135deg, #e7efe8, #cfdccc);
  
    /* 🎯 关键：对齐 showcase 的中心 */
    top: 50%;
    transform: translateY(-50%);
  
    left: calc(7% - 500px);
    z-index: 0;
}

.note-card {
    position: absolute;
    width: calc(1000px * 0.52); 
    height: calc(1000px * 0.35); 
    height: 100%;
    background: #fffdf8;
    border-radius: 18px;
    box-shadow:
      0 30px 60px rgba(0,0,0,0.15),
      0 10px 20px rgba(0,0,0,0.08);
    z-index: 2;
    overflow: hidden;
    left: 0%;
    top: 50%;
    transform: translateY(-50%);
}

.note-scroll {
    height: 100%;
    overflow-y: auto;
    scroll-snap-type: y mandatory;
}
  
.note-scroll img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    scroll-snap-align: start;
    display: block;
}

.showcase-text {
    position: absolute;
    left: 60%;
    top: 50%;
    transform: translateY(-50%);
    max-width: 420px;
    text-align: center;
}
  
.showcase-text h2 {
    font-size: 2.2rem;
    font-weight: 600;
    margin-bottom: 3rem;
    color: #012f5d;
}
  
.showcase-text p {
    font-size: 1.125rem;
    line-height: 1.7;
    color: #444;
    text-align: justify;
}

.showcase-tags {
    margin-top: 0.4rem;
    margin-left: calc(0.1rem * 7);
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
.showcase-tags span {
    padding: 0.3rem 0.75rem;
    border-radius: 999px;
    background: rgba(72, 200, 190, 0.12);
    color: #5eead4;
    font-size: 0.8rem;
}

.research-text {
    font-weight: 500;
    font-size: 4rem;
    margin-bottom: 1rem;
    color: #012f5d;
}
  
.research-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 500;
    text-transform: capitalize;
}

.research-desc{
    font-weight: 400;
}
  
.research-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    margin-top: 3rem;
}
  
.research-card {
    background: #fff;
    border-radius: 20px;
    height: 600px;           
    overflow: hidden;
}
  
  /* ⬅️ 图片滚动容器 */
.card-image-scroll {
    height: 100%;
    overflow-y: auto;           /* ✅ 只在图片区滚动 */
}
  
  /* ⬅️ 图片本体 */
.card-image-scroll img {
    width: 100%;
    height: auto;               /* 🔥 关键：允许图片自然变长 */
    display: block;
    object-fit: cover;
}
  
  /* 滚动条美化 */
.card-image-scroll::-webkit-scrollbar {
    width: 6px;
}
  
.card-image-scroll::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.25);
    border-radius: 4px;
}
  
.card-image-scroll::-webkit-scrollbar-track {
    background: transparent;
}

.blue-bg {
    background-color: #e6f0ff;  /* 浅蓝色 */
    padding: 20px;
    border-radius: 3% 3% 3% 3%;
  }

/* 基础样式 */
.skills-section {
    position: relative;
    overflow: hidden; /* 确保掉落的标签不会影响布局 */
    min-height: 400px; /* 根据内容调整 */
}
  
.skills-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 20px;
    position: relative;
    z-index: 2;
}

.skills-section h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 500;
    color: #012f5d;
    margin-top: 4rem;
    margin-bottom: 4rem;
}
  
.skill-tag {
    background-color: #f0f4f8;
    padding: 8px 16px;
    border-radius: 30px;
    font-size: 20px;
    color: #333;
    border: 1px solid #e0e6ed;
    opacity: 0; /* 初始隐藏 */
    transform: translateY(-100px); /* 初始位置在上方 */
    animation: dropIn 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
    animation-play-state: paused; /* 初始暂停动画 */
}
  
.skill-tag.animate {
    animation-play-state: running; /* 当类被添加时播放动画 */
}
  
.skill-category {
    background-color: #e6f0ff;
    border-color: #b8d1ff;
    font-weight: 500;
    color: #0052cc;
}
  
  /* 掉落动画 - 从上方掉落并弹跳 */
  @keyframes dropIn {
    0% {
      opacity: 0;
      transform: translateY(-100px) scale(0.8);
    }
    60% {
      opacity: 1;
      transform: translateY(10px) scale(1.05);
    }
    80% {
      transform: translateY(-5px) scale(0.98);
    }
    100% {
      opacity: 1;
      transform: translateY(0) scale(1);
    }
}
  
  /* 或者使用更真实的物理掉落效果 */
  @keyframes realisticDrop {
    0% {
      opacity: 0;
      transform: translateY(-200px) rotate(-5deg);
    }
    30% {
      opacity: 1;
      transform: translateY(20px) rotate(2deg);
    }
    50% {
      transform: translateY(-10px) rotate(-1deg);
    }
    70% {
      transform: translateY(5px) rotate(0.5deg);
    }
    85% {
      transform: translateY(-2px);
    }
    100% {
      opacity: 1;
      transform: translateY(0) rotate(0);
    }
}
  
  /* 不同延迟的动画 */
  .skill-tag[data-delay="0"] { animation-delay: 0s; }
  .skill-tag[data-delay="0.1"] { animation-delay: 0.1s; }
  .skill-tag[data-delay="0.2"] { animation-delay: 0.2s; }
  .skill-tag[data-delay="0.3"] { animation-delay: 0.3s; }
  .skill-tag[data-delay="0.4"] { animation-delay: 0.4s; }
  .skill-tag[data-delay="0.5"] { animation-delay: 0.5s; }
  .skill-tag[data-delay="0.6"] { animation-delay: 0.6s; }
  .skill-tag[data-delay="0.7"] { animation-delay: 0.7s; }
  .skill-tag[data-delay="0.8"] { animation-delay: 0.8s; }
  .skill-tag[data-delay="0.9"] { animation-delay: 0.9s; }
  .skill-tag[data-delay="1.0"] { animation-delay: 1.0s; }
  .skill-tag[data-delay="1.1"] { animation-delay: 1.1s; }
  .skill-tag[data-delay="1.2"] { animation-delay: 1.2s; }
  .skill-tag[data-delay="1.3"] { animation-delay: 1.3s; }
  .skill-tag[data-delay="1.4"] { animation-delay: 1.4s; }
  .skill-tag[data-delay="1.5"] { animation-delay: 1.5s; }
  .skill-tag[data-delay="1.6"] { animation-delay: 1.6s; }
  .skill-tag[data-delay="1.7"] { animation-delay: 1.7s; }

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


/* 中央卡片 —— 纯粹、干净、微阴影 */
.contact-card {
    width: 100%;
    height: 500px;
    background: #ffffff;
    border-radius: 32px;
    box-shadow: 0 20px 35px -8px rgba(0, 0, 0, 0.05), 0 5px 12px -4px rgba(0, 0, 0, 0.02);
    padding: 3.5rem 2rem;
    text-align: center;
    transition: all 0.2s ease;
}

/* 纸飞机专属容器 — 保证绝对定位留出呼吸空间 */
.plane-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 0 1.25rem 0;    /* 与标题的距离 */
    min-height: 80px;          /* 即使飞机很小也保留区域 */
}

/* 飞翔的纸飞机 —— 简洁线条风格，融入简约设计 */
.paper-plane {
    width: 70px;
    height: 70px;
    display: block;
    color: #1e2b3c;           /* 深灰蓝，不刺眼但清晰可见 */
    transition: transform 0.3s ease;
    filter: drop-shadow(0 6px 10px rgba(0, 20, 40, 0.08));
    animation: floatPlane 3.2s infinite ease-in-out;  /* 柔和飞翔动效 */
}

/* 微妙浮动 + 倾斜，模拟飞行感 */
@keyframes floatPlane {
    0% {
        transform: translateY(0px) rotate(0deg);
    }
    25% {
        transform: translateY(-6px) rotate(-1deg);
    }
    50% {
        transform: translateY(2px) rotate(2deg);
    }
    75% {
        transform: translateY(-3px) rotate(-1deg);
    }
    100% {
        transform: translateY(0px) rotate(0deg);
    }
}

/* 主标语: let's work together! */
.tagline {
    font-size: 3rem;
    font-weight: 450;
    letter-spacing: -0.01em;
    color: #1a2b3e;
    margin-bottom: 2rem;
    line-height: 1.2;
    word-break: break-word;
}

/* 联系方式区块 — 极简列表 */
.contact-details {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.contact-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 1.2rem;
    color: #2c3e4f;
    background: #f8fafd;       /* 极其淡的底色，不抢眼但增加细节 */
    padding: 0.8rem 1.8rem;
    border-radius: 80px;        /* 圆润药丸造型 */
    width: fit-content;
    transition: background 0.15s;
    border: 1px solid #ffffff;  /* 保持白边，干净 */
    box-shadow: 0 2px 6px rgba(0,0,0,0.01);
}

/* 悬浮时微微温暖 */
.contact-item:hover {
    background: #f0f4fa;
    border-color: #e2e9f2;
}

/* 图标样式 — 简单优雅，与纸飞机调性一致 */
.icon {
    width: 24px;
    height: 24px;
    color: #2c3e4f;
    opacity: 0.8;
    flex-shrink: 0;
}

/* 文字部分保留正常间隔 */
.contact-text {
    font-weight: 400;
    letter-spacing: 0.3px;
}

/* 邮箱稍微小一点，但保持可读 */
.email .contact-text {
    font-size: 1.1rem;
}

/* 手机号略突出一点，无伤大雅 */
.phone .contact-text {
    font-size: 1.2rem;
    font-weight: 430;
}

/* 简洁分隔 — 用一条很淡的线划分视觉层次，但不是必须 */
.separator {
    width: 60px;
    height: 2px;
    background: #dbe4ed;
    margin: 1.8rem auto 1.4rem auto;
    border-radius: 2px;
}

/* 确保所有内容都有合适留白 */
.contact-card :last-child {
    margin-bottom: 0;
}

/* Footer */
footer {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-xxl);
    color: var(--color-text-light);
    font-size: 0.875rem;
    transition: border-top-color 0.2s ease-in-out;
}


/* Responsive Design */
/* 防止小屏横向滚动 */
html, body {
    overflow-x: hidden;
    max-width: 100vw;
}

/* 分屏或移动端：experience-media 改为 3 列；showcase 去掉绿色圆形、上下排布、图片加长 */
@media (max-width: 1024px) {
    .experience-media .media-track {
        grid-template-columns: 1fr 1fr 1fr;
    }

    .experience-media .media-column {
        display: contents;
    }

    /* Showcase：保持图片与文字上下排布，去掉绿色圆形，图片区域加高 */
    .showcase {
        grid-template-columns: 1fr;
        height: auto;
        min-height: auto;
        padding: 2rem 1.5rem;
    }

    .showcase .arc-bg {
        display: none;
    }

    .showcase .note-card {
        position: relative;
        width: 100%;
        height: 640px;
        left: 0;
        top: 0;
        transform: none;
        margin-bottom: 2rem;
    }

    .showcase .showcase-text {
        position: static;
        left: auto;
        top: auto;
        transform: none;
        max-width: 100%;
    }

    /* About 区域：照片保持比例、缩小为 60%、居中 */
    .about-container {
        flex-direction: column;
        align-items: center;
    }

    .about-image {
        width: 100%;
        display: flex;
        justify-content: center;
    }

    .about-image img {
        width: 60%;
        max-width: 60%;
        height: auto;
        object-fit: contain;
        display: block;
        margin: 0 auto;
    }

    /* Skills 区域：标题完全露出，不被上方不规则形状遮挡 */
    .skills-section {
        position: relative;
        z-index: 11;
        padding-top: 2rem;
    }

    .skills-section h2 {
        position: relative;
        z-index: 2;
    }

    .irregular-section::after {
        height: 60px;
        bottom: -30px;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 4rem;
        --spacing-xl: 5rem;
        --spacing-xxl: 6rem;
    }

    .nav-container {
        padding: 10px 16px;
        padding-left: max(16px, env(safe-area-inset-left));
        padding-right: max(16px, env(safe-area-inset-right));
    }

    header {
        height: auto;
        min-height: 60px;
        line-height: 1.4;
        padding-top: max(0.5rem, env(safe-area-inset-top));
    }

    .brand-name {
        font-size: 0.95rem;
    }

    .nav-avatar {
        width: 32px;
        height: 32px;
        max-width: 32px;
        max-height: 32px;
    }

    .hero-btn {
        padding: 0.75rem 1.8rem;
        font-size: 0.85rem;
        margin-top: 1.5rem;
    }

    h1 {
        font-size: 2rem;
        margin-bottom: var(--spacing-md);
    }

    h2 {
        font-size: 1.75rem;
        margin-bottom: var(--spacing-md);
    }

    section:not(.hero) {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }

    nav ul {
        gap: var(--spacing-md);
    }

    nav a {
        font-size: 0.85rem;
        padding: var(--spacing-xs) var(--spacing-xs);
    }

    .banner {
        min-height: 60vh;
        min-height: 60dvh;
    }

    .banner-content {
        padding: var(--spacing-xl) var(--spacing-md);
        padding-left: max(var(--spacing-md), env(safe-area-inset-left));
        padding-right: max(var(--spacing-md), env(safe-area-inset-right));
    }

    .avatar {
        width: 120px;
        height: 120px;
        margin-bottom: var(--spacing-md);
    }

    .banner-content h1 {
        font-size: 2rem;
        margin-bottom: var(--spacing-md);
    }

    .intro {
        font-size: 1rem;
    }

    section {
        margin-bottom: var(--spacing-xl);
        padding-top: var(--spacing-sm);
    }

    /* About 区域：左右改为上下堆叠 */
    .about-container {
        flex-direction: column;
        gap: 2rem;
        padding-left: 0;
        padding-right: 0;
    }

    .about-image {
        flex: none;
        width: 100%;
        order: 1;
        overflow: visible;
        display: flex;
        justify-content: center;
    }

    .about-image img {
        width: 60%;
        max-width: 60%;
        height: auto;
        max-height: none;
        object-fit: contain;
        display: block;
        margin: 0 auto;
    }

    .about-text {
        flex: none;
        width: 100%;
        margin-left: 0;
        order: 2;
    }

    .about-text h1 {
        font-size: 2rem;
        margin-bottom: 1rem;
    }

    .about-text p {
        font-size: 1.125rem;
    }

    .exp-header {
        grid-template-columns: 120px 1fr;
        gap: 0.5rem;
    }

    .exp-time {
        font-size: 0.85rem;
    }

    .exp-place {
        font-size: 0.95rem;
    }

    .exp-desc {
        font-size: 1.125rem;
        grid-column: 1 / -1;
    }

    .exp-tags {
        margin-left: 0;
    }

    /* Irregular / Experience 区域：底部装饰缩短，避免遮挡下方 Skills 标题 */
    .irregular-section {
        width: 100%;
        margin-left: 0;
        margin-right: 0;
        padding-left: 0;
        padding-right: 0;
    }

    .irregular-section::after {
        height: 60px;
        bottom: -30px;
    }

    .irregular-container {
        max-width: 100%;
        padding: 0 1rem;
    }

    .irregular-container h2 {
        font-size: 2rem;
    }

    .experience-title {
        font-size: 2rem;
    }

    .experience-block {
        min-height: auto;
        display: block;
        margin: 3rem 0;
        gap: 0;
    }

    .experience-text {
        position: static;
        transform: none;
        margin-bottom: 2rem;
        margin-top: 0;
    }

    .experience-text P {
        font-size: 1.05rem;
    }

    .experience-media {
        display: block;
        gap: 1rem;
        height: auto;
        min-height: 300px;
        overflow: hidden;
        padding-right: 0;
        mask-image: linear-gradient(
            to bottom,
            transparent 0%,
            black 12%,
            black 88%,
            transparent 100%
        );
        -webkit-mask-image: linear-gradient(
            to bottom,
            transparent 0%,
            black 12%,
            black 88%,
            transparent 100%
        );
    }

    .experience-media .media-column {
        transform: none;
        margin-top: 0 !important;
        display: contents;
    }

    .experience-media .media-track {
        display: grid;
        grid-template-columns: 1fr 1fr 1fr;
        padding-top: 1rem;
        padding-bottom: 1rem;
        gap: 1rem;
    }

    .experience-media img {
        height: auto;
        width: 100%;
        object-fit: cover;
    }

    /* Showcase 区域：保持图片与文字上下排布，去掉绿色圆形，图片长度为 2 倍 */
    .showcase {
        grid-template-columns: 1fr;
        height: auto;
        min-height: auto;
        padding: 2rem 1.5rem;
        margin-top: 4rem;
        border-radius: 0;
    }

    .showcase .arc-bg {
        display: none;
    }

    .note-card {
        position: relative;
        width: 100%;
        height: 640px;
        left: 0;
        top: 0;
        transform: none;
        margin-bottom: 2rem;
    }

    .showcase-text {
        position: static;
        left: auto;
        top: auto;
        transform: none;
        max-width: 100%;
        text-align: left;
    }

    .showcase-text h2 {
        font-size: 1.75rem;
        margin-bottom: 1.5rem;
    }

    .showcase-text p {
        font-size: 1.125rem;
    }

    .showcase-tags {
        margin-left: 0;
    }

    /* Research 区域 */
    .research-text,
    .research-title {
        font-size: 2rem;
    }

    .research-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin-top: 2rem;
    }

    .research-card {
        height: 400px;
    }

    /* Skills 区域 */
    .skills-section {
        min-height: 300px;
        padding-left: 1rem;
        padding-right: 1rem;
        padding-top: 2.5rem;
        position: relative;
        z-index: 11;
    }

    .skills-section h2 {
        font-size: 2rem;
        margin-top: 0;
        margin-bottom: 2rem;
        position: relative;
        z-index: 2;
    }

    .skills-cloud {
        padding: 10px 0;
        gap: 8px;
    }

    .skill-tag {
        font-size: 0.95rem;
        padding: 6px 12px;
    }

    /* Contact 区域 */
    .contact-card {
        height: auto;
        min-height: 380px;
        padding: 2rem 1.5rem;
        border-radius: 24px;
        margin-left: 0;
        margin-right: 0;
    }

    .plane-wrapper {
        min-height: 60px;
        margin-bottom: 1rem;
    }

    .paper-plane {
        width: 50px;
        height: 50px;
    }

    .tagline {
        font-size: 2rem;
        margin-bottom: 1.5rem;
    }

    .contact-details {
        gap: 0.75rem;
        margin-top: 0.75rem;
    }

    .contact-item {
        font-size: 1rem;
        padding: 0.6rem 1.2rem;
        width: 100%;
        max-width: 320px;
    }

    .contact-text {
        font-size: 0.95rem;
    }

    .email .contact-text,
    .phone .contact-text {
        font-size: 0.95rem;
    }

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

    .content {
        padding-left: 1rem;
        padding-right: 1rem;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-md: 2rem;
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
        --spacing-xxl: 5rem;
    }

    .nav-container {
        padding: 8px 12px;
        padding-left: max(12px, env(safe-area-inset-left));
        padding-right: max(12px, env(safe-area-inset-right));
    }

    .brand-name {
        font-size: 0.9rem;
    }

    nav ul {
        gap: var(--spacing-sm);
    }

    nav a {
        font-size: 0.8rem;
        padding: 0.4rem 0.5rem;
    }

    section:not(.hero) {
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }

    .banner {
        min-height: 50vh;
        min-height: 50dvh;
    }

    .banner-content {
        padding: var(--spacing-lg) var(--spacing-sm);
        padding-left: max(var(--spacing-sm), env(safe-area-inset-left));
        padding-right: max(var(--spacing-sm), env(safe-area-inset-right));
    }

    .banner-content h1 {
        font-size: 1.75rem;
        margin-bottom: var(--spacing-sm);
    }

    .intro {
        font-size: 0.95rem;
    }

    .hero-btn {
        padding: 0.6rem 1.4rem;
        font-size: 0.8rem;
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
        margin-bottom: var(--spacing-md);
    }

    .about-text h1 {
        font-size: 1.75rem;
    }

    .about-text p {
        font-size: 1.125rem;
    }

    .exp-header {
        grid-template-columns: 100px 1fr;
    }

    .exp-time {
        font-size: 0.8rem;
    }

    .exp-place {
        font-size: 0.9rem;
    }

    .exp-desc {
        font-size: 1.125rem;
    }

    .irregular-container h2 {
        font-size: 1.75rem;
    }

    .experience-title {
        font-size: 1.5rem;
    }

    .showcase {
        padding: 1.5rem 1rem;
        margin-top: 3rem;
    }

    .note-card {
        height: 560px;
    }

    .showcase-text h2 {
        font-size: 1.5rem;
    }

    .showcase-text p {
        font-size: 1.125rem;
    }

    .research-title {
        font-size: 1.5rem;
    }

    .research-card {
        height: 350px;
    }

    .skills-section h2 {
        font-size: 1.5rem;
        margin-top: 0;
        margin-bottom: 1.5rem;
    }

    .skill-tag {
        font-size: 0.85rem;
        padding: 5px 10px;
    }

    .contact-card {
        min-height: 340px;
        padding: 1.5rem 1rem;
        border-radius: 20px;
    }

    .tagline {
        font-size: 1.5rem;
        margin-bottom: 1.25rem;
    }

    .contact-item {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .icon {
        width: 20px;
        height: 20px;
    }

    footer {
        padding: var(--spacing-md) var(--spacing-sm);
        padding-bottom: max(var(--spacing-md), env(safe-area-inset-bottom));
        font-size: 0.8rem;
    }

    section {
        margin-bottom: var(--spacing-lg);
    }
}

/* 超小屏手机（如 360px 及以下） */
@media (max-width: 360px) {
    .nav-container {
        padding: 6px 10px;
    }

    .brand-name {
        font-size: 0.85rem;
    }

    nav a {
        font-size: 0.75rem;
    }

    .banner-content h1 {
        font-size: 1.5rem;
    }

    .intro {
        font-size: 0.9rem;
    }

    .about-text h1 {
        font-size: 1.5rem;
    }

    .exp-header {
        grid-template-columns: 90px 1fr;
    }

    .irregular-container h2 {
        font-size: 1.5rem;
    }

    .experience-title {
        font-size: 1.35rem;
    }

    .tagline {
        font-size: 1.35rem;
    }

    .contact-item {
        max-width: 100%;
    }
}