/* ============================================================
   echo-homepage - 个人主页样式
   纯原生 CSS，Apple 毛玻璃风格，暗黑模式，响应式
   ============================================================ */

/* ============================================================
   CSS 变量 — 明亮主题（默认）
   ============================================================ */
:root {
  --bg-body:            #e8e8ed;
  --bg-second-screen:   rgba(255, 255, 255, 0.55);
  --text-primary:       #1d1d1f;
  --text-secondary:     #555;
  --text-on-glass:      #1d1d1f;
  --glass-bg:           rgba(255, 255, 255, 0.2);
  --glass-bg-strong:    rgba(255, 255, 255, 0.45);
  --glass-border:       rgba(255, 255, 255, 0.3);
  --card-bg:            rgba(255, 255, 255, 0.4);
  --card-hover-bg:      rgba(255, 255, 255, 0.65);
  --shadow-sm:          rgba(0, 0, 0, 0.06);
  --shadow-md:          rgba(0, 0, 0, 0.1);
  --shadow-lg:          rgba(0, 0, 0, 0.15);
  --sbti-accent:        #6366f1;
  --sbti-accent-light:  rgba(99, 102, 241, 0.12);
  --toggle-bg:          rgba(0, 0, 0, 0.06);
  --toggle-text:        #1d1d1f;
  --divider:            rgba(0, 0, 0, 0.08);
  --first-screen-bg:    #1e2a3a;
}

/* ============================================================
   暗黑主题：跟随系统偏好
   ============================================================ */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-body:            #0f0f1a;
    --bg-second-screen:   rgba(20, 20, 40, 0.78);
    --text-primary:       #e8e8f0;
    --text-secondary:     #9a9ab0;
    --text-on-glass:      #e8e8f0;
    --glass-bg:           rgba(40, 40, 65, 0.5);
    --glass-bg-strong:    rgba(40, 40, 65, 0.65);
    --glass-border:       rgba(255, 255, 255, 0.1);
    --card-bg:            rgba(35, 35, 60, 0.55);
    --card-hover-bg:      rgba(45, 45, 75, 0.75);
    --shadow-sm:          rgba(0, 0, 0, 0.25);
    --shadow-md:          rgba(0, 0, 0, 0.35);
    --shadow-lg:          rgba(0, 0, 0, 0.5);
    --sbti-accent:        #818cf8;
    --sbti-accent-light:  rgba(129, 140, 248, 0.15);
    --toggle-bg:          rgba(255, 255, 255, 0.08);
    --toggle-text:        #e8e8f0;
    --divider:            rgba(255, 255, 255, 0.08);
    --first-screen-bg:    #0a0a14;
  }
}

/* 手动强制暗黑 */
html.dark {
  --bg-body:            #0f0f1a;
  --bg-second-screen:   rgba(20, 20, 40, 0.78);
  --text-primary:       #e8e8f0;
  --text-secondary:     #9a9ab0;
  --text-on-glass:      #e8e8f0;
  --glass-bg:           rgba(40, 40, 65, 0.5);
  --glass-bg-strong:    rgba(40, 40, 65, 0.65);
  --glass-border:       rgba(255, 255, 255, 0.1);
  --card-bg:            rgba(35, 35, 60, 0.55);
  --card-hover-bg:      rgba(45, 45, 75, 0.75);
  --shadow-sm:          rgba(0, 0, 0, 0.25);
  --shadow-md:          rgba(0, 0, 0, 0.35);
  --shadow-lg:          rgba(0, 0, 0, 0.5);
  --sbti-accent:        #818cf8;
  --sbti-accent-light:  rgba(129, 140, 248, 0.15);
  --toggle-bg:          rgba(255, 255, 255, 0.08);
  --toggle-text:        #e8e8f0;
  --divider:            rgba(255, 255, 255, 0.08);
  --first-screen-bg:    #0a0a14;
}

/* 手动强制明亮 */
html.light {
  --bg-body:            #e8e8ed;
  --bg-second-screen:   rgba(255, 255, 255, 0.55);
  --text-primary:       #1d1d1f;
  --text-secondary:     #555;
  --text-on-glass:      #1d1d1f;
  --glass-bg:           rgba(255, 255, 255, 0.2);
  --glass-bg-strong:    rgba(255, 255, 255, 0.45);
  --glass-border:       rgba(255, 255, 255, 0.3);
  --card-bg:            rgba(255, 255, 255, 0.4);
  --card-hover-bg:      rgba(255, 255, 255, 0.65);
  --shadow-sm:          rgba(0, 0, 0, 0.06);
  --shadow-md:          rgba(0, 0, 0, 0.1);
  --shadow-lg:          rgba(0, 0, 0, 0.15);
  --sbti-accent:        #6366f1;
  --sbti-accent-light:  rgba(99, 102, 241, 0.12);
  --toggle-bg:          rgba(0, 0, 0, 0.06);
  --toggle-text:        #1d1d1f;
  --divider:            rgba(0, 0, 0, 0.08);
  --first-screen-bg:    #1e2a3a;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    'Segoe UI',
    'PingFang SC',
    'Microsoft YaHei',
    sans-serif;
  background: var(--bg-body);
  color: var(--text-primary);
  overflow-x: hidden;
  transition: background 0.4s ease, color 0.4s ease;
}

/* ============================================================
   工具类
   ============================================================ */
.no-wrap {
  white-space: nowrap;
}

/* ============================================================
   Apple 毛玻璃基础样式
   ============================================================ */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
}

/* ============================================================
   暗黑模式切换按钮
   ============================================================ */
#theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 200;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.25s ease, background 0.3s ease;
  padding: 0;
  line-height: 1;
}

#theme-toggle:hover {
  transform: scale(1.1);
}

#theme-toggle:active {
  transform: scale(0.95);
}

/* 默认：明亮模式 → 显示月亮，隐藏太阳 */
.theme-icon-dark { display: inline; }
.theme-icon-light { display: none; }

/* 系统偏好暗黑 → 显示太阳，隐藏月亮 */
@media (prefers-color-scheme: dark) {
  :root .theme-icon-dark { display: none; }
  :root .theme-icon-light { display: inline; }
}

/* 手动暗黑 → 显示太阳 */
html.dark .theme-icon-dark { display: none; }
html.dark .theme-icon-light { display: inline; }

/* 手动明亮 → 显示月亮（覆盖系统暗黑偏好） */
html.light .theme-icon-dark { display: inline; }
html.light .theme-icon-light { display: none; }

/* ============================================================
   共享头像（fixed 定位，JS 驱动跨屏过渡）
   ============================================================ */
#shared-avatar {
  position: fixed;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  object-fit: cover;
  z-index: 100;
  pointer-events: none;
  box-shadow: 0 8px 32px var(--shadow-lg);
  will-change: left, top;
  transition: box-shadow 0.4s ease;
}

/* ============================================================
   第一屏
   ============================================================ */
#first-screen {
  position: relative;
  height: 100vh;
  overflow: hidden;
  background: var(--first-screen-bg);
  transition: background 0.4s ease;
}

/* 壁纸 <img> 全屏铺满 */
#wallpaper {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  opacity: 0;
  transition: opacity 0.8s ease;
}

#wallpaper.loaded {
  opacity: 1;
}

/* 淡出层：包裹首屏内容 + 版权，随滚动 opacity 0→1 反向 */
#first-fade-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* 首屏核心内容：flex column 垂直居中 */
#first-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
}

/* 头像占位（不可见，仅维持 flex 间距） */
#avatar-placeholder {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  visibility: hidden;
  flex-shrink: 0;
}

/* 打字效果文字：头像下方 32px */
#typewriter {
  margin-top: 32px;
  font-size: 2rem;
  font-weight: 600;
  color: #fff;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.45);
  text-align: center;
  min-height: 2.6rem;
  line-height: 1.3;
}

#typewriter .static-text,
#typewriter-name {
  color: #fff;
}

#typewriter .cursor {
  display: inline-block;
  color: #fff;
  font-weight: 300;
  animation: cursorBlink 0.8s step-end infinite;
}

@keyframes cursorBlink {
  50% { opacity: 0; }
}

/* 描述卡片 */
#description-card {
  margin-top: 28px;
  padding: 24px 32px;
  max-width: 540px;
  width: 90%;
  color: #fff;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.35);
  line-height: 1.85;
  font-size: 0.95rem;
  word-break: keep-all;
  overflow-wrap: break-word;
}

#description-card p {
  margin-bottom: 4px;
}

#description-card p:last-child {
  margin-bottom: 0;
}

/* 版权框：桌面端右下角，宽度自适应文字 */
#copyright {
  position: absolute;
  bottom: 24px;
  right: 24px;
  padding: 10px 20px;
  font-size: 0.85rem;
  color: #fff;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.45);
  display: inline-block;
  width: fit-content;
  white-space: nowrap;
  max-width: 70vw;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ============================================================
   第二屏
   ============================================================ */
#second-screen {
  min-height: 100vh;
  position: relative;
  z-index: 2;
  background: var(--bg-second-screen);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: background 0.4s ease;
}

#second-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 60px 20px 80px;
  min-height: 100vh;
}

/* 第二屏头像目标位置占位 */
#avatar-target {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  visibility: hidden;
  flex-shrink: 0;
  margin-bottom: 40px;
}

/* ============================================================
   卡片分区
   ============================================================ */
.card-section {
  width: 100%;
  max-width: 720px;
  margin-bottom: 36px;
}

.card-section:last-child {
  margin-bottom: 0;
}

.card-section-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-left: 4px;
  transition: color 0.4s ease;
}

.card-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* 项目列表（纵向排列） */
.project-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.project-list .link-card {
  width: 100%;
  justify-content: flex-start;
  padding-left: 24px;
}

.project-list .link-card::after {
  content: "→";
  margin-left: auto;
  font-size: 1.15rem;
  opacity: 0.35;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.project-list .link-card:hover::after {
  transform: translateX(4px);
  opacity: 1;
}

/* 链接卡片 */
.link-card {
  flex: 1 1 0;
  min-width: 0;
  padding: 22px 18px;
  text-align: center;
  text-decoration: none;
  color: var(--text-on-glass);
  font-size: 0.95rem;
  font-weight: 500;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    transform 0.25s ease,
    box-shadow 0.25s ease,
    background 0.3s ease;
}

.link-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 28px var(--shadow-md);
  background: var(--card-hover-bg);
}

/* ============================================================
   响应式：平板及以下 (≤768px)
   ============================================================ */
@media (max-width: 768px) {
  #typewriter {
    font-size: 1.45rem;
    margin-top: 26px;
  }

  #description-card {
    padding: 18px 20px;
    font-size: 0.85rem;
    line-height: 1.75;
    max-width: 92%;
  }

  #shared-avatar {
    width: 100px;
    height: 100px;
  }

  #avatar-placeholder {
    width: 100px;
    height: 100px;
  }

  #avatar-target {
    width: 100px;
    height: 100px;
    margin-bottom: 20px;
  }

  /* 移动端版权：居中 + 换行显示完整文字 */
  #copyright {
    bottom: 20px;
    right: auto;
    left: 50%;
    transform: translateX(-50%);
    padding: 10px 18px;
    font-size: 0.78rem;
    white-space: normal;
    text-align: center;
    max-width: 88vw;
    overflow: visible;
    text-overflow: unset;
  }

  #theme-toggle {
    top: 14px;
    right: 14px;
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  .card-section {
    margin-bottom: 28px;
  }

  .card-section-title {
    font-size: 1rem;
    text-align: center;
    padding-left: 0;
  }

  .card-row {
    flex-direction: column;
    align-items: center;
  }

  .project-list .link-card {
    width: 92%;
    padding-left: 20px;
  }

  .link-card {
    max-width: 100%;
    width: 92%;
    flex: none;
  }

}

/* ============================================================
   响应式：小屏手机 (≤480px)
   ============================================================ */
@media (max-width: 480px) {
  #typewriter {
    font-size: 1.2rem;
    margin-top: 22px;
    min-height: 2.2rem;
  }

  #description-card {
    margin-top: 20px;
    padding: 14px 16px;
    font-size: 0.8rem;
    line-height: 1.7;
    max-width: 94%;
    word-break: normal;
  }

  #shared-avatar {
    width: 80px;
    height: 80px;
  }

  #avatar-placeholder {
    width: 80px;
    height: 80px;
  }

  #avatar-target {
    width: 80px;
    height: 80px;
    margin-bottom: 16px;
  }

  #copyright {
    bottom: 16px;
    padding: 8px 14px;
    font-size: 0.72rem;
    max-width: 90vw;
  }

  #second-content {
    padding: 40px 14px 60px;
  }

  .card-section {
    margin-bottom: 22px;
  }

  .card-section-title {
    font-size: 0.95rem;
  }

  .card-row {
    gap: 12px;
  }

  .project-list {
    gap: 10px;
  }

  .project-list .link-card {
    width: 92%;
    padding-left: 18px;
  }

  .link-card {
    padding: 20px 16px;
    font-size: 0.9rem;
  }

}