/* ============================================================
   Zowan 笔记 — 增强样式表
   为功能介绍区添加图片装饰 + 优化更新日志视觉风格
   ============================================================ */

/* ---------- 导入原有变量 ---------- */
:root {
  /* 新增装饰相关变量 */
  --decor-opacity: 0.12;
  --decor-blur: 40px;
}

/* ============================================================
   3. 功能介绍区 - 增强版
   ============================================================ */
.features {
  position: relative;
  background:
    radial-gradient(90% 70% at 85% 0%, rgba(255, 210, 127, 0.16), transparent 60%),
    radial-gradient(80% 70% at 10% 100%, rgba(143, 182, 255, 0.18), transparent 60%),
    var(--bg-white);
  overflow: hidden;
}

/* 装饰性背景元素 */
.features__decoration {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.features__decoration-circle {
  position: absolute;
  border-radius: 50%;
  opacity: var(--decor-opacity);
  filter: blur(var(--decor-blur));
}

.features__decoration-circle--1 {
  width: 400px;
  height: 400px;
  top: -100px;
  right: -100px;
  background: radial-gradient(circle, #bcd6ff, transparent 70%);
  animation: decorFloat 20s ease-in-out infinite;
}

.features__decoration-circle--2 {
  width: 350px;
  height: 350px;
  bottom: -80px;
  left: -80px;
  background: radial-gradient(circle, #ffe6b0, transparent 70%);
  animation: decorFloat 25s ease-in-out infinite reverse;
}

.features__decoration-circle--3 {
  width: 300px;
  height: 300px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, #ffc9d6, transparent 70%);
  opacity: 0.08;
  animation: decorFloat 22s ease-in-out infinite;
}

@keyframes decorFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -25px) scale(1.05); }
  66% { transform: translate(-20px, 15px) scale(0.95); }
}

/* 吉祥物装饰 */
.features__mascot-decor {
  position: absolute;
  bottom: 40px;
  right: 60px;
  width: 180px;
  height: auto;
  opacity: 0.15;
  filter: grayscale(20%);
  animation: mascotDecorFloat 6s ease-in-out infinite;
  z-index: 0;
}

@keyframes mascotDecorFloat {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-15px) rotate(2deg); }
}

/* 功能卡片网格 */
.features__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

/* 功能卡片 - 增强版 */
.feature-card {
  position: relative;
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: 0 8px 32px rgba(80, 110, 150, 0.1);
  transition: transform var(--transition-normal),
    box-shadow var(--transition-normal),
    background-color var(--transition-normal);
  overflow: hidden;
}

/* 功能卡片插图 */
.feature-card__illustration {
  position: absolute;
  bottom: -10px;
  right: -10px;
  width: 120px;
  height: auto;
  opacity: 0.12;
  transition: opacity var(--transition-normal), transform var(--transition-normal);
  pointer-events: none;
  z-index: 0;
}

.feature-card:hover .feature-card__illustration {
  opacity: 0.2;
  transform: translate(-5px, -5px) scale(1.05);
}

/* 卡片背景装饰图案 */
.feature-card::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 70% 30%, rgba(143, 182, 255, 0.08), transparent 50%);
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
  z-index: 0;
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 44px rgba(80, 110, 150, 0.18);
  background: rgba(255, 255, 255, 0.75);
}

.feature-card__icon {
  position: relative;
  z-index: 1;
  width: 48px;
  height: 48px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(143, 182, 255, 0.22), rgba(255, 210, 127, 0.22));
  color: var(--btn-outline);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.feature-card:hover .feature-card__icon {
  transform: scale(1.1);
  box-shadow: 0 4px 12px rgba(143, 182, 255, 0.3);
}

.feature-card__icon svg {
  width: 24px;
  height: 24px;
}

.feature-card__title {
  position: relative;
  z-index: 1;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.feature-card__desc {
  position: relative;
  z-index: 1;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================================
   4. 更新日志区 - 增强版
   ============================================================ */
.changelog {
  background-color: var(--bg-main);
  position: relative;
  overflow: hidden;
}

/* 更新日志背景装饰 */
.changelog::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(180deg, rgba(143, 182, 255, 0.06), transparent);
  pointer-events: none;
}

/* 时间线容器 */
.timeline {
  position: relative;
  padding-left: 40px;
}

/* 时间线竖线 - 增强版 */
.timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--btn-outline), rgba(143, 182, 255, 0.3));
  border-radius: 1px;
}

.timeline__item {
  position: relative;
  margin-bottom: 40px;
  animation: timelineItemFadeIn 0.6s ease-out both;
}

.timeline__item:nth-child(1) { animation-delay: 0.1s; }
.timeline__item:nth-child(2) { animation-delay: 0.2s; }
.timeline__item:nth-child(3) { animation-delay: 0.3s; }

@keyframes timelineItemFadeIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.timeline__item:last-child {
  margin-bottom: 0;
}

/* 时间线圆点 - 增强版 */
.timeline__dot {
  position: absolute;
  left: -40px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--btn-outline), #8fb6ff);
  border: 2px solid var(--bg-main);
  box-shadow: 0 0 0 2px var(--btn-outline), 0 2px 8px rgba(143, 182, 255, 0.3);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.timeline__item:hover .timeline__dot {
  transform: scale(1.3);
  box-shadow: 0 0 0 2px var(--btn-outline), 0 4px 12px rgba(143, 182, 255, 0.5);
}

/* 版本内容卡片 */
.timeline__content {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  box-shadow: 0 4px 16px rgba(80, 110, 150, 0.08);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.timeline__item:hover .timeline__content {
  transform: translateX(4px);
  box-shadow: 0 8px 24px rgba(80, 110, 150, 0.12);
}

/* 版本头部 */
.timeline__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.timeline__version {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  background: linear-gradient(135deg, rgba(143, 182, 255, 0.15), rgba(255, 210, 127, 0.15));
  padding: 4px 14px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.timeline__version::before {
  content: "🚀";
  font-size: 0.9rem;
}

.timeline__date {
  font-size: 0.9rem;
  color: var(--text-weak);
}

/* 变更条目列表 */
.timeline__changes {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.timeline__change {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  padding: 6px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.03);
}

.timeline__change:last-child {
  border-bottom: none;
}

/* 变更类型标签 - 增强版 */
.tag {
  display: inline-flex;
  align-items: center;
  font-size: 0.78rem;
  font-weight: 500;
  padding: 3px 12px;
  border-radius: var(--radius-full);
  white-space: nowrap;
  flex-shrink: 0;
  line-height: 1.6;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.tag--new {
  background: linear-gradient(135deg, #e8f5e9, #c8e6c9);
  color: #2e7d32;
}

.tag--opt {
  background: linear-gradient(135deg, #e3f2fd, #bbdefb);
  color: #1565c0;
}

.tag--fix {
  background: linear-gradient(135deg, #fff3e0, #ffe0b2);
  color: #e65100;
}

/* ============================================================
   响应式 — 平板 / 移动端 (≤768px)
   ============================================================ */
@media (max-width: 768px) {
  .features__grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .feature-card {
    padding: 28px 24px;
  }

  .feature-card__illustration {
    width: 90px;
    bottom: -5px;
    right: -5px;
  }

  .features__mascot-decor {
    width: 120px;
    bottom: 20px;
    right: 30px;
    opacity: 0.1;
  }

  .features__decoration-circle--1 { width: 250px; height: 250px; }
  .features__decoration-circle--2 { width: 200px; height: 200px; }
  .features__decoration-circle--3 { width: 180px; height: 180px; }

  .timeline {
    padding-left: 32px;
  }

  .timeline::before {
    left: 11px;
  }

  .timeline__dot {
    left: -32px;
    width: 10px;
    height: 10px;
  }

  .timeline__header {
    flex-direction: column;
    gap: 4px;
  }

  .timeline__content {
    padding: 20px 24px;
  }
}

/* ============================================================
   响应式 — 小屏手机 (≤480px)
   ============================================================ */
@media (max-width: 480px) {
  .features__mascot-decor {
    display: none;
  }

  .feature-card__illustration {
    width: 70px;
  }

  .timeline__content {
    padding: 16px 20px;
  }

  .tag {
    font-size: 0.72rem;
    padding: 2px 8px;
  }
}