/* Daily Insights — Apple-style: minimalist, spacious, premium */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@0,400;0,700;0,900&display=swap');

:root{
  --bg:#fbfbfd;--surface:#fff;--ink:#1d1d1f;--gray:#86868b;--gray2:#6e6e73;
  --line:#d2d2d7;--line2:#e8e8ed;--accent:#0071e3;--accent2:#0066cc;
  --tag-bg:#f5f5f7;--radius:18px;--shadow:0 4px 24px rgba(0,0,0,.04);
  --shadow-hover:0 8px 40px rgba(0,0,0,.08);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{background:var(--bg);color:var(--ink);font:400 17px/1.47 'Inter',-apple-system,BlinkMacSystemFont,'SF Pro Display','SF Pro Text',sans-serif;min-height:100vh}

/* ===== Nav ===== */
.daily-nav{
  position:sticky;top:0;z-index:100;
  background:rgba(251,251,253,.72);backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid var(--line2);
  padding:14px 24px;display:flex;align-items:center;justify-content:space-between;
}
.daily-nav-brand{
  font-family:'Playfair Display',serif;font-style:italic;font-weight:900;font-size:24px;
  background:linear-gradient(135deg,var(--accent),#af52de);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
  text-decoration:none;letter-spacing:-.02em;
}
.daily-nav-back{font-size:14px;color:var(--accent);text-decoration:none;display:flex;align-items:center;gap:4px;transition:opacity .2s}
.daily-nav-back:hover{opacity:.7}

/* ===== Main ===== */
.daily-main{max-width:800px;margin:0 auto;padding:48px 24px 80px}

/* ===== Header ===== */
.daily-header{margin-bottom:48px;animation:fadeUp .8s ease}
.daily-date{
  font-size:40px;font-weight:700;letter-spacing:-.03em;line-height:1.1;margin-bottom:6px;
}
.daily-meta{font-size:15px;color:var(--gray);font-weight:400}

/* ===== Section ===== */
.daily-section{margin-bottom:44px;animation:fadeUp .8s ease}
.daily-section-title{
  font-size:13px;font-weight:600;color:var(--gray2);
  text-transform:none;letter-spacing:0;
  margin-bottom:20px;
  display:flex;align-items:center;gap:8px;
}
.daily-section-title .section-icon{font-size:16px}
.daily-section-title .section-count{
  margin-left:auto;font-size:12px;color:var(--gray);font-weight:400;
}

/* Sub-category */
.daily-sub-section{margin:0 0 16px;padding-left:0;border-left:none}
.daily-sub-title{
  font-size:14px;font-weight:600;color:var(--gray2);
  margin-bottom:12px;padding-left:12px;border-left:2px solid var(--line);
}

/* ===== News Card ===== */
.news-card{
  background:var(--surface);border:none;border-radius:var(--radius);
  padding:28px 32px;margin-bottom:14px;
  transition:transform .3s ease,box-shadow .3s ease;
  position:relative;
}
.news-card:hover{transform:translateY(-1px);box-shadow:var(--shadow-hover)}

/* Featured card */
.news-card.featured{
  background:linear-gradient(180deg,#fafafa 0%,#fff 100%);
  border:1px solid var(--line2);
  padding:32px 36px;
}
.news-card.featured::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--accent),#af52de);
  border-radius:var(--radius) var(--radius) 0 0;
}

/* Title */
.news-title{font-size:20px;font-weight:600;line-height:1.3;margin-bottom:6px;letter-spacing:-.01em}
.news-title-en{font-size:15px;color:var(--gray);font-weight:400;line-height:1.4;margin-bottom:4px;font-style:italic}
.news-title-zh{font-size:20px;font-weight:600;line-height:1.3;margin-bottom:6px;letter-spacing:-.01em}

/* Summary */
.news-summary{font-size:16px;color:var(--gray2);line-height:1.5;margin-bottom:16px;font-weight:400}

/* Expansion */
.news-expansion{
  font-size:15px;color:#424245;line-height:1.65;
  background:transparent;border:none;border-left:2px solid var(--accent);
  border-radius:0;padding:4px 0 4px 16px;margin-bottom:16px;
}
.news-expansion-label{display:none}

/* Footer */
.news-footer{
  display:flex;align-items:center;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--gray);
}
.news-source{font-weight:500;color:var(--gray2)}
.news-time{color:var(--gray)}
.news-tag{
  display:inline-block;padding:3px 10px;border-radius:12px;
  font-size:12px;font-weight:500;background:var(--tag-bg);color:var(--gray2);
}
.news-tag[data-cat="ai-med-cross"]{background:#e8f5e9;color:#2e7d32}
.news-tag[data-cat="industry-trend"]{background:#e3f2fd;color:#1565c0}
.news-tag[data-cat="emerging-tech"]{background:#f3e5f5;color:#7b1fa2}
.news-tag[data-cat="research"]{background:#e8eaf6;color:#3f51b5}
.news-tag[data-cat="aesthetic-tech"]{background:#fce4ec;color:#c2185b}
.news-tag[data-cat="leader-views"]{background:#fff8e1;color:#f57f17}
.news-tag[data-cat="med-school-news"]{background:#e0f2f1;color:#00695c}
.news-tag[data-cat="policy"]{background:#ffebee;color:#c62828}
.news-tag[data-cat="ai-news"]{background:#eceff1;color:#455a64}

.news-link{
  color:var(--accent);text-decoration:none;font-weight:500;font-size:13px;
}
.news-link:hover{text-decoration:underline}

.news-ask-btn{
  margin-left:auto;
  background:transparent;border:1px solid var(--line);border-radius:16px;
  padding:4px 14px;font-size:12px;color:var(--accent);cursor:pointer;
  transition:all .2s;font-weight:500;
}
.news-ask-btn:hover{background:var(--accent);color:#fff;border-color:var(--accent)}

/* ===== Introduction Page ===== */
.intro-card{
  background:var(--surface);border:none;border-radius:var(--radius);
  padding:48px;box-shadow:var(--shadow);margin-bottom:32px;
  animation:fadeUp .8s ease;
}
.intro-title{font-size:28px;font-weight:700;margin-bottom:20px;letter-spacing:-.02em}
.intro-text{font-size:16px;color:var(--gray2);line-height:1.65;margin-bottom:16px}
.intro-list{list-style:none;padding-left:0;margin-top:16px}
.intro-list li{
  padding:6px 0;font-size:15px;color:var(--gray2);
  display:flex;align-items:center;gap:10px;line-height:1.5;
}
.intro-list li::before{content:'';width:5px;height:5px;border-radius:50%;background:var(--accent);flex-shrink:0}

/* ===== Today Card ===== */
.today-card{
  background:var(--surface);border:1px solid var(--line2);border-radius:var(--radius);
  padding:28px 36px;box-shadow:var(--shadow);margin-bottom:32px;
  display:flex;align-items:center;justify-content:space-between;
  text-decoration:none;color:var(--ink);transition:all .3s;
  animation:fadeUp .8s .1s ease;
}
.today-card:hover{box-shadow:var(--shadow-hover);border-color:var(--accent)}
.today-info h3{font-size:22px;font-weight:600;margin-bottom:4px;letter-spacing:-.01em}
.today-info p{font-size:15px;color:var(--gray)}
.today-arrow{font-size:20px;color:var(--accent);transition:transform .3s}
.today-card:hover .today-arrow{transform:translateX(4px)}

/* ===== Archive ===== */
.archive-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.archive-item{
  background:var(--surface);border:1px solid var(--line2);border-radius:12px;
  padding:10px 18px;text-decoration:none;color:var(--ink);
  font-size:14px;transition:all .2s;display:flex;align-items:center;gap:8px;
}
.archive-item:hover{border-color:var(--accent);background:var(--tag-bg)}
.archive-item .archive-count{font-size:12px;color:var(--gray)}
.archive-item.latest{border-color:var(--accent);background:#eef4ff}

/* ===== Date Nav ===== */
.date-nav{
  display:flex;justify-content:space-between;align-items:center;
  margin-top:48px;padding-top:24px;border-top:1px solid var(--line2);
}
.date-nav a{
  text-decoration:none;color:var(--accent);font-size:15px;font-weight:500;
  transition:opacity .2s;
}
.date-nav a:hover{opacity:.7}
.date-nav .date-nav-disabled{color:var(--gray);pointer-events:none;opacity:.4}

/* ===== Chat Widget ===== */
.chat-toggle{
  position:fixed;bottom:24px;right:24px;z-index:1000;
  width:52px;height:52px;border-radius:50%;
  background:var(--accent);border:none;cursor:pointer;color:#fff;font-size:22px;
  box-shadow:0 4px 20px rgba(0,113,227,.3);
  display:flex;align-items:center;justify-content:center;
  transition:transform .3s,box-shadow .3s;
}
.chat-toggle:hover{transform:scale(1.06);box-shadow:0 6px 28px rgba(0,113,227,.4)}

.chat-panel{
  position:fixed;bottom:24px;right:24px;z-index:1001;
  width:380px;height:520px;max-height:calc(100vh - 48px);
  background:var(--surface);border-radius:var(--radius);box-shadow:0 24px 80px rgba(0,0,0,.12);
  display:none;flex-direction:column;overflow:hidden;
  animation:chatOpen .3s ease;
}
.chat-panel.open{display:flex}
@keyframes chatOpen{from{opacity:0;transform:translateY(16px) scale(.96)}to{opacity:1;transform:translateY(0) scale(1)}}

.chat-header{
  padding:16px 20px;background:var(--accent);color:#fff;
  display:flex;align-items:center;justify-content:space-between;
}
.chat-header-title{font-size:15px;font-weight:600}
.chat-close{background:none;border:none;color:#fff;font-size:22px;cursor:pointer;opacity:.8;transition:opacity .2s;line-height:1}
.chat-close:hover{opacity:1}

.chat-context{
  padding:10px 20px;background:var(--tag-bg);font-size:12px;color:var(--gray);
  border-bottom:1px solid var(--line2);display:none;
}
.chat-context.show{display:block}
.chat-context-label{font-weight:600;color:var(--accent)}

.chat-messages{
  flex:1;overflow-y:auto;padding:16px 20px;
  display:flex;flex-direction:column;gap:10px;
}
.chat-messages::-webkit-scrollbar{width:0}

.chat-msg{font-size:15px;line-height:1.5;max-width:88%}
.chat-msg.user{
  align-self:flex-end;background:var(--accent);color:#fff;
  border-radius:16px 16px 4px 16px;padding:8px 16px;
}
.chat-msg.assistant{
  align-self:flex-start;background:var(--tag-bg);color:var(--ink);
  border-radius:16px 16px 16px 4px;padding:8px 16px;
}
.chat-msg.typing{color:var(--gray);font-style:italic}

.chat-input-wrap{padding:12px 16px;border-top:1px solid var(--line2);display:flex;gap:8px}
.chat-input{
  flex:1;border:1px solid var(--line);border-radius:20px;
  padding:8px 16px;font-size:15px;outline:none;transition:border-color .2s;
  font-family:inherit;
}
.chat-input:focus{border-color:var(--accent)}
.chat-send{
  background:var(--accent);color:#fff;border:none;border-radius:20px;
  padding:8px 18px;font-size:14px;cursor:pointer;font-weight:500;transition:background .2s;
}
.chat-send:hover{background:var(--accent2)}
.chat-send:disabled{background:var(--gray);cursor:not-allowed}

/* ===== Empty / Loading ===== */
.daily-empty{text-align:center;padding:60px 20px;color:var(--gray);font-size:15px}

/* ===== Footer ===== */
.daily-footer{text-align:center;padding:32px;font-size:13px;color:var(--gray)}
.daily-footer a{color:var(--accent);text-decoration:none}

/* ===== Animation ===== */
@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}

/* ===== Responsive ===== */
@media(max-width:768px){
  .daily-main{padding:32px 16px 64px}
  .daily-date{font-size:30px}
  .news-card{padding:20px}
  .news-card.featured{padding:24px}
  .intro-card{padding:24px}
  .today-card{padding:20px;flex-direction:column;align-items:flex-start;gap:12px}
  .chat-panel{width:100%;height:100%;bottom:0;right:0;border-radius:0}
  .chat-toggle{bottom:16px;right:16px;width:48px;height:48px;font-size:20px}
  .archive-list{flex-direction:column}
  .archive-item{width:100%}
}