/* =====================================================================
 * GlimmerAI UX Enhancements — 全局增强样式
 * 包含：进度条、鼠标光晕、链接动画、玻璃态卡片、表单焦点
 * ===================================================================== */

/* ===== 0. Skip Navigation Link (可访问性) ===== */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  z-index: 10000;
  padding: 12px 24px;
  background: var(--color-primary, #7BA7A6);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 0 0 6px 0;
}

.skip-link:focus {
  position: fixed;
  left: 0;
  top: 0;
  width: auto;
  height: auto;
  overflow: visible;
  outline: 3px solid var(--color-accent, #E63946);
  outline-offset: 2px;
}

/* ===== Screen Reader Only (visually hidden, accessible) ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== 1. 页面加载进度条 ===== */
#page-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 9999;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s var(--ease-out-quart);
}

#page-progress.active {
  opacity: 1;
}

#page-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--monet-pond), var(--monet-iris), var(--monet-lotus));
  transition: width 0.2s var(--ease-out-quart);
  border-radius: 0 2px 2px 0;
  box-shadow: 0 0 10px rgba(123, 167, 166, 0.5);
}

#page-progress.complete {
  opacity: 0;
  transition: opacity 0.5s var(--ease-out-quart) 0.3s;
}

/* ===== 2. 鼠标跟随光晕效果 ===== */
#cursor-glow {
  position: fixed;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9998;
  opacity: 0;
  transition: opacity 0.3s var(--ease-out-quart);
  background: radial-gradient(circle, 
    rgba(123, 167, 166, 0.15) 0%, 
    rgba(155, 124, 182, 0.08) 40%, 
    transparent 70%);
  filter: blur(40px);
  transform: translate(-50%, -50%);
  will-change: left, top;
}

#cursor-glow.visible {
  opacity: 1;
}

/* 浅色主题下光晕更淡 */
body.light #cursor-glow,
[data-theme="light"] #cursor-glow {
  background: radial-gradient(circle, 
    rgba(123, 167, 166, 0.1) 0%, 
    rgba(155, 124, 182, 0.05) 40%, 
    transparent 70%);
}

/* 移动端隐藏光晕 */
@media (max-width: 768px) {
  #cursor-glow {
    display: none !important;
  }
}

/* ===== 3. 链接下划线动画 ===== */
.animated-link {
  position: relative;
  display: inline-block;
  color: var(--color-text-primary);
  text-decoration: none;
}

.animated-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--monet-pond), var(--monet-iris));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-out-quart);
}

.animated-link:hover::after {
  transform: scaleX(1);
}

/* 为所有站内文本链接添加动画（排除按钮和导航） */
a:not(.btn-primary):not(.btn-ghost):not(.btn-outline):not(.yardon-nav-brand):not(.yardon-nav-link):not(.nav-link):not([class*="btn"]):not(.blog-card):not(.project-card) {
  position: relative;
}

a:not(.btn-primary):not(.btn-ghost):not(.btn-outline):not(.yardon-nav-brand):not(.yardon-nav-link):not(.nav-link):not([class*="btn"]):not(.blog-card):not(.project-card)::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: linear-gradient(90deg, var(--monet-pond), var(--monet-iris));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-out-quart);
  opacity: 0.7;
}

a:not(.btn-primary):not(.btn-ghost):not(.btn-outline):not(.yardon-nav-brand):not(.yardon-nav-link):not(.nav-link):not([class*="btn"]):not(.blog-card):not(.project-card):hover::after {
  transform: scaleX(1);
}

/* ===== 4. 卡片玻璃态增强 ===== */
.card-glass {
  background: var(--color-bg-glass);
  backdrop-filter: blur(20px) saturate(1.8);
  -webkit-backdrop-filter: blur(20px) saturate(1.8);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  box-shadow: 
    0 4px 24px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.06),
    0 0 0 1px rgba(255, 255, 255, 0.03);
  transition: all 0.3s var(--ease-out-quart);
}

.card-glass:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border-hover);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    0 0 0 1px rgba(123, 167, 166, 0.2),
    0 0 20px rgba(123, 167, 166, 0.1);
  transform: translateY(-2px);
}

/* 浅色主题卡片 */
body.light .card-glass,
[data-theme="light"] .card-glass {
  background: rgba(255, 255, 255, 0.85);
  box-shadow: 
    0 4px 24px rgba(0, 0, 0, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.8),
    0 0 0 1px rgba(0, 0, 0, 0.05);
}

body.light .card-glass:hover,
[data-theme="light"] .card-glass:hover {
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.9),
    0 0 0 1px rgba(123, 167, 166, 0.3),
    0 0 20px rgba(123, 167, 166, 0.08);
}

/* ===== 5. 表单输入焦点动画 ===== */
.form-field {
  position: relative;
  margin-bottom: 1.5rem;
}

.form-field label {
  position: absolute;
  top: 50%;
  left: 16px;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  font-size: 1rem;
  pointer-events: none;
  transition: all 0.3s var(--ease-out-quart);
  background: transparent;
  padding: 0 4px;
}

.form-field textarea ~ label {
  top: 24px;
  transform: translateY(0);
}

.form-field input:focus ~ label,
.form-field input:not(:placeholder-shown) ~ label,
.form-field textarea:focus ~ label,
.form-field textarea:not(:placeholder-shown) ~ label {
  top: 0;
  transform: translateY(-50%) scale(0.85);
  color: var(--monet-pond);
  background: var(--color-bg-page);
}

.form-field input,
.form-field textarea {
  width: 100%;
  padding: 16px;
  background: var(--color-bg-input);
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text-primary);
  font-size: 1rem;
  transition: all 0.3s var(--ease-out-quart);
  outline: none;
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--monet-pond);
  box-shadow: 0 0 0 3px rgba(123, 167, 166, 0.15);
}

/* 底部高光线 */
.form-field::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--monet-pond), var(--monet-iris));
  transition: all 0.3s var(--ease-out-quart);
  transform: translateX(-50%);
  border-radius: 1px;
}

.form-field:focus-within::after {
  width: 100%;
}

/* ===== 6. 3D 透视卡片堆叠 ===== */
.card-3d {
  transform: perspective(1000px) rotateX(2deg) rotateY(-1deg);
  transition: all 0.4s var(--ease-out-quart);
  transform-style: preserve-3d;
}

.card-3d:hover {
  transform: perspective(1000px) rotateX(0deg) rotateY(0deg) translateZ(20px);
  box-shadow: 
    0 20px 40px rgba(0, 0, 0, 0.2),
    0 0 0 1px rgba(123, 167, 166, 0.2);
}

/* ===== 7. 滚动视差容器 ===== */
[data-parallax-depth] {
  will-change: transform;
  transition: transform 0.1s linear;
}

/* ===== 8. 代码块增强 ===== */
.code-enhanced {
  position: relative;
  margin: 1.5rem 0;
  border-radius: 10px;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--color-border);
}

.code-enhanced-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--color-border);
}

.code-enhanced-lang {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-family: 'JetBrains Mono', monospace;
  text-transform: uppercase;
}

.code-copy-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s var(--ease-out-quart);
  font-family: 'JetBrains Mono', monospace;
}

.code-copy-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--color-text-primary);
  border-color: var(--color-border-hover);
}

.code-copy-btn.copied {
  color: var(--monet-water-green);
  border-color: var(--monet-water-green);
  background: rgba(42, 157, 143, 0.1);
}

.code-enhanced pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  tab-size: 2;
}

.code-enhanced code {
  font-family: inherit;
}

/* 行号 */
.code-line {
  display: flex;
  min-height: 1.6em;
}

.code-line-number {
  flex-shrink: 0;
  width: 3.5em;
  padding-right: 1em;
  text-align: right;
  color: var(--color-text-subtle);
  opacity: 0.5;
  user-select: none;
  font-size: 0.8em;
  line-height: 1.6;
  border-right: 1px solid var(--color-border-light);
  margin-right: 1em;
}

.code-line-content {
  flex: 1;
  min-width: 0;
}

.code-line.highlighted {
  background: rgba(123, 167, 166, 0.1);
  margin: 0 -16px;
  padding: 0 16px;
  border-left: 3px solid var(--monet-pond);
}

.code-line.highlighted .code-line-number {
  color: var(--monet-pond);
  opacity: 1;
}

/* 代码折叠 */
.code-collapse-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 6px;
  background: rgba(0, 0, 0, 0.15);
  border: none;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s var(--ease-out-quart);
  font-family: 'JetBrains Mono', monospace;
}

.code-collapse-btn:hover {
  background: rgba(0, 0, 0, 0.25);
  color: var(--color-text-primary);
}

.code-collapse-btn svg {
  width: 14px;
  height: 14px;
  margin-right: 6px;
  transition: transform 0.3s var(--ease-out-quart);
}

.code-collapse-btn.collapsed svg {
  transform: rotate(180deg);
}

/* ===== 10. 面包屑导航 ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.breadcrumb-item {
  opacity: 0;
  transform: translateX(-10px);
  animation: breadcrumb-in 0.4s var(--ease-out-quart) forwards;
}

.breadcrumb-item:nth-child(1) { animation-delay: 0.1s; }
.breadcrumb-item:nth-child(2) { animation-delay: 0.2s; }
.breadcrumb-item:nth-child(3) { animation-delay: 0.3s; }
.breadcrumb-item:nth-child(4) { animation-delay: 0.4s; }

@keyframes breadcrumb-in {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.breadcrumb-separator {
  color: var(--color-text-subtle);
  font-size: 0.75rem;
}

.breadcrumb-current {
  color: var(--monet-pond);
  font-weight: 500;
  position: relative;
}

.breadcrumb-current::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--monet-pond);
  animation: pulse-line 2s var(--ease-in-out-quart) infinite;
}

@keyframes pulse-line {
  0%, 100% { opacity: 0.5; transform: scaleX(0.8); }
  50% { opacity: 1; transform: scaleX(1); }
}

/* ===== 11. View Transition API 支持 ===== */
@keyframes fade-in {
  from { opacity: 0; }
}

@keyframes fade-out {
  to { opacity: 0; }
}

@keyframes slide-from-right {
  from { transform: translateX(30px); }
}

@keyframes slide-to-left {
  to { transform: translateX(-30px); }
}

::view-transition-old(root) {
  animation: 0.25s ease-out both fade-out, 0.25s ease-out both slide-to-left;
}

::view-transition-new(root) {
  animation: 0.25s ease-out both fade-in, 0.25s ease-out both slide-from-right;
}

/* 共享元素过渡 */
::view-transition-old(site-nav),
::view-transition-new(site-nav) {
  animation: none;
  mix-blend-mode: normal;
}

/* ===== 12. 减少动画偏好 ===== */
@media (prefers-reduced-motion: reduce) {
  #page-progress,
  #cursor-glow {
    display: none !important;
  }
  
  .animated-link::after,
  a:not(.btn-primary):not(.btn-ghost):not(.btn-outline)::after {
    transition: none !important;
  }
  
  .card-glass,
  .card-3d {
    transition: none !important;
  }
  
  .card-3d {
    transform: none !important;
  }
  
  .breadcrumb-item {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
  
  .breadcrumb-current::after {
    animation: none !important;
  }
  
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation: none !important;
  }
}