/* ==========================================================================
   多囊肾病友网 — 全局样式表
   多囊肾患者支持网站 · 静态 POC
   ========================================================================== */

/* ---------- 设计令牌 ---------- */
:root {
  /* 主色：沉静青蓝 → 柔和暖青 */
  --color-primary: #3a8fa3;
  --color-primary-dark: #2a6d7e;
  --color-primary-light: #eef6f9;
  --color-primary-gradient: linear-gradient(135deg, #3a8fa3 0%, #5bb5c8 100%);

  /* 强调色：温暖珊瑚琥珀 */
  --color-accent: #e89a6c;
  --color-accent-light: #fdf0e6;
  --color-accent-gradient: linear-gradient(135deg, #e89a6c 0%, #f4b894 100%);

  /* 辅助色：柔和绿（安全提示） */
  --color-safe: #5ba876;
  --color-safe-bg: #eef8f2;

  /* 文字 */
  --color-text: #333333;
  --color-text-light: #777777;
  --color-text-lighter: #999999;

  /* 背景 */
  --color-bg: #fafbfc;
  --color-bg-alt: #f0f4f6;
  --color-bg-warm: #faf5f0;
  --color-border: #e0e8eb;
  --color-border-light: #eef2f4;

  /* 危险 */
  --color-danger: #c95a5a;
  --color-danger-bg: #fdf2f1;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;

  /* 布局 */
  --max-width: 920px;
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  /* 阴影：柔和多层 */
  --shadow-xs: 0 1px 2px rgba(42, 109, 126, 0.04);
  --shadow-sm: 0 2px 8px rgba(42, 109, 126, 0.06), 0 1px 2px rgba(42, 109, 126, 0.04);
  --shadow-md: 0 4px 16px rgba(42, 109, 126, 0.08), 0 2px 4px rgba(42, 109, 126, 0.04);
  --shadow-lg: 0 8px 32px rgba(42, 109, 126, 0.10), 0 4px 8px rgba(42, 109, 126, 0.06);
  --shadow-warm: 0 4px 16px rgba(232, 154, 108, 0.12), 0 2px 4px rgba(232, 154, 108, 0.08);

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.75;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- 跳转链接（无障碍） ---------- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 0.6rem 1.2rem;
  z-index: 1000;
  border-radius: 0 0 var(--radius-sm) 0;
  font-size: 0.9rem;
  text-decoration: none;
}
.skip-link:focus { top: 0; }

/* ---------- 页头 ---------- */
.site-header {
  background: var(--color-primary-gradient);
  color: #fff;
  padding: 0;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}
/* 装饰光晕 */
.site-header::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255,255,255,0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.site-header::after {
  content: '';
  position: absolute;
  bottom: -60%;
  left: -5%;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(232,154,108,0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  min-height: 68px;
  position: relative;
  z-index: 1;
}
.site-logo {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
  letter-spacing: 0.03em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0;
}
.site-logo::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ---------- 导航 ---------- */
.site-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem;
}
.site-nav a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-pill);
  transition: var(--transition);
  display: flex;
  align-items: center;
  min-height: 44px;
  font-weight: 400;
}
.site-nav a:hover,
.site-nav a:focus,
.site-nav a[aria-current="page"] {
  background: rgba(255,255,255,0.18);
  color: #fff;
  backdrop-filter: blur(4px);
}

/* ---------- 主区域 ---------- */
.site-main {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  width: 100%;
}

/* ---------- 页面标题区 ---------- */
.page-hero {
  background: var(--color-primary-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  margin-bottom: 2.5rem;
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(58, 143, 163, 0.08);
}
/* 装饰圆 */
.page-hero::before {
  content: '';
  position: absolute;
  top: -30px;
  right: -30px;
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, rgba(58,143,163,0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.page-hero::after {
  content: '';
  position: absolute;
  bottom: -40px;
  left: 20%;
  width: 80px;
  height: 80px;
  background: radial-gradient(circle, rgba(232,154,108,0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.page-hero h1 {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 0.6rem;
  letter-spacing: 0.02em;
  position: relative;
}
.page-hero p {
  color: var(--color-text-light);
  font-size: 0.98rem;
  position: relative;
}

/* ---------- Hero 每日一言（小型动画彩蛋） ---------- */
.hero-daily {
  font-family: var(--font-serif);
  font-size: 0.92rem;
  color: var(--color-primary);
  margin-top: 1rem;
  min-height: 1.5em;
  opacity: 0;
  font-style: italic;
}

/* 动画效果 A：逐字淡入 */
.hero-daily--fade-chars .hero-daily__char {
  display: inline-block;
  opacity: 0;
  animation: charFadeIn 0.5s ease forwards;
}
@keyframes charFadeIn {
  to { opacity: 1; }
}

/* 动画效果 B：整体打字机 */
.hero-daily--typewriter {
  border-right: 2px solid var(--color-primary);
  overflow: hidden;
  white-space: nowrap;
  animation: typewriter 2s steps(30) forwards, blinkCursor 0.7s step-end infinite;
}
@keyframes typewriter {
  from { width: 0; }
  to { width: 100%; }
}
@keyframes blinkCursor {
  50% { border-color: transparent; }
}

/* 动画效果 C：从下方滑入 */
.hero-daily--slide-up {
  transform: translateY(12px);
  animation: slideUp 0.8s ease 0.3s forwards;
}
@keyframes slideUp {
  to { opacity: 1; transform: translateY(0); }
}

/* 动画效果 D：逐字弹跳 */
.hero-daily--bounce .hero-daily__char {
  display: inline-block;
  opacity: 0;
  transform: translateY(8px);
  animation: charBounce 0.6s ease forwards;
}
@keyframes charBounce {
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 排版 ---------- */
h1, h2, h3, h4 { line-height: 1.35; color: var(--color-text); }
h2 {
  font-size: 1.35rem;
  margin: 2.5rem 0 1rem;
  color: var(--color-primary-dark);
  font-weight: 600;
  position: relative;
  padding-left: 1rem;
}
h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 1.1em;
  background: var(--color-primary-gradient);
  border-radius: var(--radius-pill);
}
h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.6rem;
  font-weight: 600;
  color: var(--color-text);
}
p { margin-bottom: 1rem; }
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition);
}
a:hover, a:focus { color: var(--color-primary-dark); text-decoration: underline; }

/* ---------- 卡片网格 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.2rem;
  margin: 1.5rem 0;
}
.card {
  background: #fff;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-xs);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary-gradient);
  opacity: 0;
  transition: var(--transition);
}
.card:hover, .card:focus {
  box-shadow: var(--shadow-md);
  border-color: rgba(58, 143, 163, 0.2);
  transform: translateY(-3px);
  text-decoration: none;
}
.card:hover::before, .card:focus::before {
  opacity: 1;
}
.card__icon {
  font-size: 1.8rem;
  margin-bottom: 0.8rem;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
}
.card__title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--color-primary-dark);
}
.card__desc {
  font-size: 0.88rem;
  color: var(--color-text-light);
  flex: 1;
  line-height: 1.65;
}

/* ---------- 页脚医疗提示紧凑条 ---------- */
.footer-alert {
  background: var(--color-danger-bg);
  border-left: 3px solid var(--color-danger);
  border-radius: var(--radius-sm);
  padding: 0.6rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.8rem;
  color: var(--color-text);
  line-height: 1.6;
}
.footer-alert strong { color: var(--color-danger); }

/* ---------- 医疗安全提示框 ---------- */
.medical-alert {
  background: var(--color-danger-bg);
  border: 1px solid rgba(201, 90, 90, 0.2);
  border-left: 4px solid var(--color-danger);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
}
.medical-alert__title {
  font-weight: 600;
  color: var(--color-danger);
  margin-bottom: 0.4rem;
  font-size: 0.92rem;
}
.medical-alert__body {
  font-size: 0.86rem;
  color: var(--color-text);
  line-height: 1.65;
}

/* ---------- 医疗提示（绿色安全框） ---------- */
.medical-note {
  background: var(--color-safe-bg);
  border: 1px solid rgba(91, 168, 118, 0.2);
  border-left: 4px solid var(--color-safe);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
}
.medical-note__title {
  font-weight: 600;
  color: var(--color-safe);
  margin-bottom: 0.4rem;
  font-size: 0.92rem;
}
.medical-note__body { font-size: 0.86rem; line-height: 1.65; }

/* ---------- 每日一言彩蛋 ---------- */
.daily-egg {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.8);
  font-size: 0.8rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-sans);
  min-height: 36px;
  backdrop-filter: blur(4px);
}
.daily-egg:hover, .daily-egg:focus {
  border-color: var(--color-accent);
  color: #fff;
  background: rgba(232,154,108,0.2);
}
.daily-egg__icon {
  font-size: 1rem;
  transition: transform 0.6s ease;
}
.daily-egg:hover .daily-egg__icon {
  transform: rotate(180deg);
}

/* 每日一言浮层 */
.daily-modal {
  position: fixed;
  inset: 0;
  background: rgba(42, 109, 126, 0.4);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.daily-modal.is-open {
  opacity: 1;
  pointer-events: auto;
}
.daily-modal__card {
  background: var(--color-primary-gradient);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  max-width: 420px;
  width: 90%;
  text-align: center;
  box-shadow: var(--shadow-lg);
  transform: scale(0.9) translateY(10px);
  transition: transform 0.3s ease;
  position: relative;
  overflow: hidden;
}
.daily-modal__card::before {
  content: '';
  position: absolute;
  top: -30px;
  right: -30px;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.daily-modal.is-open .daily-modal__card {
  transform: scale(1) translateY(0);
}
.daily-modal__quote {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  line-height: 1.75;
  margin-bottom: 1rem;
  position: relative;
}
.daily-modal__author {
  font-size: 0.82rem;
  opacity: 0.75;
  margin-bottom: 1.5rem;
  position: relative;
}
.daily-modal__close {
  background: rgba(255,255,255,0.2);
  border: none;
  color: #fff;
  padding: 0.5rem 1.8rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: 0.85rem;
  transition: var(--transition);
  min-height: 36px;
  font-family: var(--font-sans);
  position: relative;
}
.daily-modal__close:hover {
  background: rgba(255,255,255,0.3);
}

/* 每日一言独立页保留大块展示 */
.daily-page-word {
  background: var(--color-primary-gradient);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  text-align: center;
  margin: 2rem 0;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}
.daily-page-word::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -40px;
  width: 150px;
  height: 150px;
  background: radial-gradient(circle, rgba(255,255,255,0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.daily-page-word::after {
  content: '';
  position: absolute;
  bottom: -50px;
  left: -20px;
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, rgba(232,154,108,0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.daily-page-word__quote {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  line-height: 1.7;
  margin-bottom: 1rem;
  position: relative;
}
.daily-page-word__author {
  font-size: 0.88rem;
  opacity: 0.8;
  position: relative;
}

/* ---------- 来源标注 ---------- */
.source-ref {
  font-size: 0.8rem;
  color: var(--color-text-lighter);
  border-top: 1px solid var(--color-border-light);
  padding-top: 0.8rem;
  margin-top: 2rem;
  line-height: 1.7;
}
.source-ref strong { color: var(--color-text-light); }

/* ---------- 元数据标签 ---------- */
.meta-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.8rem 0;
}
.meta-tag {
  font-size: 0.76rem;
  padding: 0.25rem 0.7rem;
  border-radius: var(--radius-pill);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text-light);
  font-weight: 400;
}
.meta-tag--evidence { background: #eef4fb; border-color: #c8d8e8; color: #4a6a8a; }
.meta-tag--date { background: #f0f0f0; border-color: #ddd; }

/* ---------- 列表 ---------- */
ul, ol { margin: 0 0 1rem 1.3rem; }
li { margin-bottom: 0.4rem; }

/* ---------- 引用块 ---------- */
blockquote {
  margin: 1rem 0;
  padding: 1rem 1.5rem;
  border-left: 4px solid var(--color-primary);
  background: var(--color-primary-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-primary-dark);
  font-size: 0.95rem;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.7);
  padding: 2.5rem 0 2rem;
  margin-top: 2rem;
  position: relative;
  overflow: hidden;
}
.site-footer::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 10%;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(232,154,108,0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
}
.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-bottom: 1.2rem;
  align-items: center;
}
.site-footer__nav a {
  color: rgba(255,255,255,0.65);
  font-size: 0.85rem;
  text-decoration: none;
  transition: var(--transition);
}
.site-footer__nav a:hover { color: #fff; }
.site-footer__disclaimer {
  font-size: 0.8rem;
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: 1rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.55);
}
.site-footer__copy {
  font-size: 0.78rem;
  margin-top: 0.8rem;
  opacity: 0.5;
}
.site-footer__ai-note {
  font-size: 0.74rem;
  margin-top: 0.4rem;
  opacity: 0.4;
  line-height: 1.5;
}

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  .site-header__inner { flex-direction: column; padding: 0.8rem 1rem; gap: 0.3rem; }
  .site-nav ul { justify-content: center; }
  .site-nav a { font-size: 0.82rem; padding: 0.4rem 0.7rem; }
  .page-hero { padding: 1.8rem 1.2rem; border-radius: var(--radius); }
  .page-hero h1 { font-size: 1.35rem; }
  .hero-daily { font-size: 0.85rem; }
  .daily-word__quote, .daily-page-word__quote { font-size: 1.15rem; }
  .daily-page-word { padding: 2rem 1.2rem; }
  .card-grid { grid-template-columns: 1fr; }
  .site-main { padding: 1.5rem 1rem; }
  h2 { font-size: 1.2rem; }
}

/* ---------- 聚焦可见性 ---------- */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}