/* ============================================================
   个人介绍页面 — 温暖插画风格样式
   小周大师 · Master Zhou
   ============================================================ */

/* -------------------- CSS 变量 -------------------- */
:root {
  /* 颜色 */
  --color-bg:           #FFF8F0;
  --color-bg-alt:       #FFF0E6;
  --color-text:         #5D4037;
  --color-text-light:   #8D6E63;
  --color-primary:      #FF8A65;
  --color-primary-dark: #F4511E;
  --color-secondary:    #FFB74D;
  --color-accent:       #FFD54F;
  --color-card-bg:      #FFFFFF;
  --color-shadow:       rgba(255, 138, 101, 0.15);
  --color-shadow-hover: rgba(255, 138, 101, 0.25);
  --color-border:       #FFE0B2;
  --color-heart:        #FF6B6B;
  --color-green:        #A5D6A7;
  --color-green-dark:   #66BB6A;
  --color-purple:       #CE93D8;
  --color-purple-dark:  #AB47BC;

  /* 字体 */
  --font-body:  'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-deco:  'Caveat', 'Comic Sans MS', cursive;

  /* 字号 */
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.5rem;
  --text-2xl:  2rem;
  --text-3xl:  2.5rem;
  --text-4xl:  3.5rem;

  /* 间距 */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* 阴影 */
  --shadow-sm: 0 2px 8px var(--color-shadow);
  --shadow-md: 0 4px 16px var(--color-shadow);
  --shadow-lg: 0 8px 32px var(--color-shadow);
  --shadow-hover: 0 12px 40px var(--color-shadow-hover);

  /* 过渡 */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* -------------------- 基础重置 -------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

ul {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* -------------------- 通用组件 -------------------- */

/* 区域容器 */
.section {
  padding: var(--space-4xl) 0;
  position: relative;
}

.section-alt {
  background-color: var(--color-bg-alt);
}

.section-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 3rem);
}

/* 区域标题 */
.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  font-size: var(--text-xl);
  margin-bottom: var(--space-md);
  box-shadow: 0 4px 16px rgba(255, 138, 101, 0.3);
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.section-desc {
  font-size: var(--text-lg);
  color: var(--color-text-light);
  font-weight: 300;
}

/* 卡片 */
.card {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

/* 小标题 */
.card-subtitle {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

/* 卡片图标容器 */
.card-icon-wrapper {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  font-size: var(--text-lg);
  margin-bottom: var(--space-md);
}

/* -------------------- 导航栏 -------------------- */
#navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 248, 240, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

#navbar.scrolled {
  box-shadow: 0 2px 16px var(--color-shadow);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 3rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-primary-dark);
  transition: transform var(--transition-bounce);
}

.nav-brand:hover {
  transform: scale(1.05);
}

.nav-brand i {
  font-size: var(--text-xl);
  color: var(--color-secondary);
  animation: spin-slow 8s linear infinite;
}

/* 导航链接 */
.nav-links {
  display: flex;
  gap: var(--space-xs);
}

.nav-link {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-light);
  transition: all var(--transition);
  position: relative;
}

.nav-link:hover {
  color: var(--color-primary-dark);
  background: rgba(255, 138, 101, 0.1);
}

.nav-link.active {
  color: var(--color-primary-dark);
  background: rgba(255, 138, 101, 0.12);
  font-weight: 600;
}

/* 进度条 */
.progress-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary), var(--color-accent));
  width: 0%;
  transition: width 0.1s linear;
}

/* 汉堡菜单按钮 */
.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: var(--text-xl);
  transition: background var(--transition);
}

.menu-toggle:hover {
  background: rgba(255, 138, 101, 0.1);
}

/* -------------------- Hero 区域 -------------------- */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background:
    radial-gradient(ellipse 80% 60% at 50% 30%, rgba(255, 183, 77, 0.15) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 80% 80%, rgba(255, 138, 101, 0.1) 0%, transparent 70%),
    var(--color-bg);
  overflow: hidden;
}

.hero-content {
  text-align: center;
  z-index: 2;
  padding: var(--space-xl);
  animation: fadeInUp 1s ease-out;
}

/* 头像 */
.hero-avatar {
  position: relative;
  display: inline-block;
  margin-bottom: var(--space-xl);
}

.avatar-circle {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: white;
  box-shadow: 0 8px 32px rgba(255, 138, 101, 0.35);
  animation: pulse 3s ease-in-out infinite;
}

.avatar-glow {
  position: absolute;
  inset: -8px;
  border-radius: var(--radius-full);
  background: transparent;
  box-shadow: 0 0 40px rgba(255, 183, 77, 0.3);
  animation: pulse 3s ease-in-out infinite 0.5s;
}

/* 文字 */
.hero-title {
  margin-bottom: var(--space-md);
}

.hero-name {
  display: block;
  font-size: clamp(2.5rem, 8vw, var(--text-4xl));
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-en-name {
  display: block;
  font-family: var(--font-deco);
  font-size: clamp(1.5rem, 4vw, 2rem);
  color: var(--color-text-light);
  margin-top: var(--space-xs);
  opacity: 0.7;
}

.hero-tagline {
  font-size: var(--text-xl);
  color: var(--color-text);
  font-weight: 500;
  margin-bottom: var(--space-sm);
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-light);
  font-weight: 300;
  margin-bottom: var(--space-2xl);
}

/* 向下滚动提示 */
.hero-scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-text-light);
  font-size: var(--text-sm);
  opacity: 0.7;
  cursor: pointer;
  transition: opacity var(--transition);
}

.hero-scroll-hint:hover {
  opacity: 1;
}

.bounce-icon {
  animation: bounce 2s ease-in-out infinite;
}

/* 浮动装饰 */
.hero-decorations {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

.deco-circle {
  position: absolute;
  border-radius: var(--radius-full);
  opacity: 0.15;
}

.deco-1 {
  width: 200px;
  height: 200px;
  background: var(--color-primary);
  top: 10%;
  left: -5%;
  animation: float 6s ease-in-out infinite;
}

.deco-2 {
  width: 150px;
  height: 150px;
  background: var(--color-secondary);
  top: 60%;
  right: -3%;
  animation: float 8s ease-in-out infinite 1s;
}

.deco-3 {
  width: 100px;
  height: 100px;
  background: var(--color-accent);
  top: 20%;
  right: 15%;
  animation: float 7s ease-in-out infinite 2s;
}

.deco-cloud {
  position: absolute;
  font-size: 2.5rem;
  opacity: 0.3;
  animation: float 10s ease-in-out infinite;
}

.deco-cloud-1 {
  top: 15%;
  left: 20%;
}

.deco-star {
  position: absolute;
  font-size: 1.5rem;
  color: var(--color-secondary);
  opacity: 0.4;
  animation: float 5s ease-in-out infinite;
}

.deco-star-1 {
  top: 25%;
  right: 10%;
  animation-delay: 0s;
}

.deco-star-2 {
  top: 70%;
  left: 10%;
  font-size: 1rem;
  color: var(--color-primary);
  animation-delay: 1.5s;
}

.deco-star-3 {
  bottom: 25%;
  right: 25%;
  font-size: 1.2rem;
  color: var(--color-accent);
  animation-delay: 3s;
}

/* 波浪分割 */
.wave-divider {
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  z-index: 3;
}

.wave-divider svg {
  display: block;
  width: 100%;
  height: 80px;
}

/* -------------------- Section 1: 个人简介 -------------------- */
.intro-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.intro-card {
  position: relative;
}

.intro-card .card-icon-wrapper {
  margin-bottom: var(--space-lg);
}

.intro-text {
  font-size: var(--text-base);
  color: var(--color-text);
  line-height: 1.9;
  margin-bottom: var(--space-md);
}

.intro-text:last-child {
  margin-bottom: 0;
}

.intro-text strong {
  color: var(--color-primary-dark);
}

.intro-text em {
  color: var(--color-text-light);
  font-style: italic;
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-sm);
}

.intro-side {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* MBTI 卡片 */
.mbti-card {
  text-align: center;
  background: linear-gradient(135deg, #FFF8F0, #FFE0B2);
  border: 2px solid var(--color-secondary);
}

.mbti-badge {
  display: inline-block;
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--color-primary-dark);
  margin-bottom: var(--space-sm);
}

.mbti-label {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  font-weight: 500;
  margin-bottom: var(--space-sm);
}

.mbti-desc {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: 300;
}

/* 性格标签 */
.trait-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.trait-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: transform var(--transition-bounce);
}

.trait-tag:hover {
  transform: scale(1.08);
}

.trait-tag i {
  font-size: var(--text-xs);
}

.tag-warm {
  background: #FFE0B2;
  color: #E65100;
}

.tag-creative {
  background: #E1BEE7;
  color: #6A1B9A;
}

.tag-social {
  background: #BBDEFB;
  color: #1565C0;
}

.tag-free {
  background: #C8E6C9;
  color: #2E7D32;
}

/* -------------------- Section 2: 爱好兴趣 -------------------- */
.hobby-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-xl);
}

.hobby-card {
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
}

.hobby-icon-wrapper {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: var(--radius-full);
  font-size: 1.8rem;
  color: white;
  margin-bottom: var(--space-lg);
  transition: transform var(--transition-bounce);
}

.hobby-card:hover .hobby-icon-wrapper {
  transform: scale(1.12) rotate(-5deg);
}

.icon-sport {
  background: linear-gradient(135deg, #FF8A65, #FF6B6B);
}

.icon-outdoor {
  background: linear-gradient(135deg, #4FC3F7, #29B6F6);
}

.icon-code {
  background: linear-gradient(135deg, #66BB6A, #43A047);
}

.icon-tech {
  background: linear-gradient(135deg, #AB47BC, #7B1FA2);
}

.hobby-title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.hobby-desc {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.hobby-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  justify-content: center;
}

.hobby-tags span {
  font-size: var(--text-xs);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  background: var(--color-bg-alt);
  color: var(--color-text-light);
  border: 1px solid var(--color-border);
}

/* -------------------- Section 3: 技能 & 作品 -------------------- */

/* 技能标签云 */
.skills-section {
  margin-bottom: var(--space-3xl);
  text-align: center;
}

.skill-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
  max-width: 700px;
  margin: 0 auto;
}

.skill-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  border: 2px solid;
  transition: all var(--transition-bounce);
  cursor: default;
}

.skill-tag:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.skill-level {
  font-size: var(--text-xs);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
  letter-spacing: 0.05em;
}

/* 精通 */
.skill-master {
  background: #FFF3E0;
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
}
.skill-master .skill-level {
  background: var(--color-primary);
  color: white;
}

/* 熟练 */
.skill-proficient {
  background: #FFFDE7;
  border-color: var(--color-secondary);
  color: #E65100;
}
.skill-proficient .skill-level {
  background: var(--color-secondary);
  color: white;
}

/* 学习中 */
.skill-learning {
  background: #F3E5F5;
  border-color: var(--color-purple);
  color: var(--color-purple-dark);
}
.skill-learning .skill-level {
  background: var(--color-purple);
  color: white;
}

/* 作品集 */
.portfolio-section {
  text-align: center;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-lg);
}

.portfolio-card {
  overflow: hidden;
  padding: 0;
  text-align: left;
}

.portfolio-preview {
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.portfolio-preview::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 30px;
  background: linear-gradient(transparent, rgba(0,0,0,0.03));
}

.portfolio-info {
  padding: var(--space-lg);
}

.portfolio-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.portfolio-desc {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.portfolio-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.portfolio-tags span {
  font-size: var(--text-xs);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--color-bg-alt);
  color: var(--color-text-light);
  border: 1px solid var(--color-border);
}

.portfolio-more {
  text-align: center;
  opacity: 0.85;
}

/* -------------------- Section 4: 追求 & 联系 -------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

/* 人生信条 */
.pursuit-card .card-icon-wrapper {
  margin-bottom: var(--space-lg);
}

.pursuit-quote {
  margin: var(--space-lg) 0;
  padding: var(--space-lg);
  background: var(--color-bg-alt);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  position: relative;
}

.pursuit-quote::before {
  content: '"';
  position: absolute;
  top: -10px;
  left: var(--space-md);
  font-size: 3rem;
  font-family: var(--font-deco);
  color: var(--color-primary);
  opacity: 0.4;
  line-height: 1;
}

.pursuit-quote p {
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.8;
  font-style: italic;
}

.pursuit-text {
  font-size: var(--text-base);
  color: var(--color-text);
  line-height: 1.9;
  margin-bottom: var(--space-md);
}

.pursuit-text:last-child {
  margin-bottom: 0;
}

.pursuit-text strong {
  color: var(--color-primary-dark);
}

/* 联系方式 */
.contact-side {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.contact-intro {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  margin-bottom: var(--space-xl);
  line-height: 1.7;
}

.contact-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.contact-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-md);
  border-radius: var(--radius-md);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  transition: all var(--transition-bounce);
  text-align: center;
}

.contact-link:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
  background: white;
}

.contact-icon-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  font-size: 1.4rem;
  transition: transform var(--transition-bounce);
}

.contact-link:hover .contact-icon-wrapper {
  transform: scale(1.1) rotate(-8deg);
}

.contact-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}

.contact-note {
  margin-top: var(--space-lg);
  font-size: var(--text-xs);
  color: var(--color-text-light);
  text-align: center;
  background: var(--color-bg-alt);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
}

/* -------------------- 页脚 -------------------- */
#footer {
  background: linear-gradient(180deg, var(--color-bg), var(--color-bg-alt));
  border-top: 1px solid var(--color-border);
  padding: var(--space-3xl) 0;
  text-align: center;
}

.footer-container {
  max-width: 600px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: var(--space-md);
}

.footer-brand i {
  color: var(--color-secondary);
}

.footer-text {
  font-size: var(--text-base);
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

.footer-copy {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  opacity: 0.7;
}

/* -------------------- 回到顶部按钮 -------------------- */
#back-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  font-size: var(--text-lg);
  box-shadow: 0 4px 16px rgba(255, 138, 101, 0.35);
  z-index: 999;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all var(--transition-bounce);
  display: flex;
  align-items: center;
  justify-content: center;
}

#back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 8px 24px rgba(255, 138, 101, 0.45);
}

/* -------------------- 动画 -------------------- */

/* 入场动画（默认隐藏） */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.animate-on-scroll.animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* 级联延迟 */
.animate-on-scroll:nth-child(1) { transition-delay: 0s; }
.animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.animate-on-scroll:nth-child(4) { transition-delay: 0.3s; }
.animate-on-scroll:nth-child(5) { transition-delay: 0.4s; }
.animate-on-scroll:nth-child(6) { transition-delay: 0.5s; }

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-15px);
  }
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-12px);
  }
  60% {
    transform: translateY(-6px);
  }
}

@keyframes pulse {
  0% {
    box-shadow: 0 8px 32px rgba(255, 138, 101, 0.35);
  }
  50% {
    box-shadow: 0 8px 48px rgba(255, 138, 101, 0.5), 0 0 0 16px rgba(255, 138, 101, 0.08);
  }
  100% {
    box-shadow: 0 8px 32px rgba(255, 138, 101, 0.35);
  }
}

@keyframes spin-slow {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* -------------------- 减少动画偏好 -------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* -------------------- 响应式 -------------------- */

/* 平板及以下 (≤1024px) */
@media (max-width: 1024px) {
  .intro-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .intro-side {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .contact-links {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* 大手机 (≤768px) */
@media (max-width: 768px) {
  :root {
    --text-3xl: 2rem;
    --text-2xl: 1.5rem;
    --text-xl: 1.25rem;
    --space-4xl: 4rem;
    --space-3xl: 2.5rem;
  }

  .intro-side {
    grid-template-columns: 1fr;
  }

  .contact-links {
    grid-template-columns: 1fr 1fr;
  }

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

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

/* 手机 (≤640px) */
@media (max-width: 640px) {
  .section {
    padding: var(--space-4xl) 0;
  }

  /* 移动端导航 */
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    width: 100%;
    background: rgba(255, 248, 240, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    flex-direction: column;
    padding: var(--space-md);
    gap: var(--space-xs);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-110%);
    opacity: 0;
    transition: all var(--transition);
    z-index: 999;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
  }

  .nav-link {
    display: block;
    padding: var(--space-md);
    text-align: center;
    font-size: var(--text-base);
  }

  .menu-toggle {
    display: flex;
  }

  /* Hero */
  .avatar-circle {
    width: 96px;
    height: 96px;
    font-size: 2.2rem;
  }

  .hero-name {
    font-size: var(--text-3xl);
  }

  .deco-1,
  .deco-2 {
    display: none;
  }

  /* 卡片 */
  .hobby-grid {
    gap: var(--space-md);
  }

  .skill-cloud {
    gap: var(--space-sm);
  }

  .skill-tag {
    padding: var(--space-xs) var(--space-md);
    font-size: var(--text-xs);
  }

  #back-to-top {
    bottom: var(--space-md);
    right: var(--space-md);
    width: 42px;
    height: 42px;
  }

  .contact-links {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
  }
}