/* === HOME PAGE — Light Mode === */
:root {
  --bg: #fafaf9!important; --card-bg: #fff!important;
  --text: #1c1917!important; --text-2: #525252!important; --text-3: #a3a3a3!important;
  --accent-dsp: #3b82f6; --accent-sensor: #3b82f6;
  --border: #e5e5e5!important;
  --radius: 16px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px}
body{min-width:320px;overflow-x:auto;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--text);
  min-height: 100vh;
  display: flex; flex-direction: column; align-items: center;
  padding: 40px 20px;
}

/* Hero */
.home-hero{
  text-align: center; padding: 40px 0 50px;
}
.home-hero h1{
  font-size: 2.4rem; font-weight: 800; letter-spacing: -.02em;
  background: linear-gradient(135deg, #bfdbfe 0%, #93c5fd 50%, #3b82f6 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}
.home-hero .sub{
  font-size: 1rem; color: var(--text-2);
}

/* Cards grid */
.home-cards{
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 24px; max-width: 860px; width: 100%;
}
.home-card{
  display: block; text-decoration: none;
  width: 100%; min-height: 0;
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 36px 32px;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  cursor: pointer; position: relative; overflow: hidden;
}
.home-card::before{
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  transition: opacity .25s; opacity: .4;
}
.card-dsp::before{ background: linear-gradient(90deg, var(--accent-dsp), #6366f1) }
.card-sensor::before{ background: linear-gradient(90deg, var(--accent-sensor), #1d4ed8) }

/* === COMING SOON PLACEHOLDERS === */
.card-placeholder{
  opacity: .55;
  margin: 0 !important;
}
.card-placeholder:hover{ transform: translateY(-3px); box-shadow: 0 4px 20px rgba(0,0,0,.08); opacity: .7; }
.card-stm32::before{ background: linear-gradient(90deg, #06b6d4, #0891b2) }
.card-stm32 .card-icon{ background: rgba(6,182,212,.1); color: #06b6d4 }
.card-ds::before{ background: linear-gradient(90deg, #f59e0b, #d97706) }
.card-ds .card-icon{ background: rgba(245,158,11,.1); color: #f59e0b }
.card-cpp::before{ background: linear-gradient(90deg, #8b5cf6, #7c3aed) }
.card-em::before{ background: linear-gradient(90deg, #14b8a6, #0d9488) }
.card-em .card-icon{ background: rgba(20,184,166,.1); color: #14b8a6 }
.em-badge{ background: rgba(20,184,166,.12); color: #14b8a6 }
/* === 数字图像处理 === */
.card-dip::before{ background: linear-gradient(90deg, #8b5cf6, #6366f1) }
.card-dip .card-icon{ background: rgba(139,92,246,.1); color: #8b5cf6 }
.dip-badge{ background: rgba(139,92,246,.12); color: #8b5cf6 }
@media(hover:hover){
  .card-dip::before{ opacity: .6 }
/* === 信号处理 === */
.card-sp::before{ background: linear-gradient(90deg, #06b6d4, #0ea5e9) }
.card-sp .card-icon{ background: rgba(6,182,212,.1); color: #06b6d4 }
.sp-badge{ background: rgba(6,182,212,.12); color: #06b6d4 }
@media(hover:hover){
  .card-sp::before{ opacity: .6 }
}

}
.card-cpp .card-icon{ background: rgba(139,92,246,.1); color: #8b5cf6 }
.soon-badge{
  background: rgba(0,0,0,.04) !important; color: var(--text-3) !important;
  border: 1px dashed var(--border) !important;
}

.home-card:hover{ transform: translateY(-3px); box-shadow: 0 4px 20px rgba(0,0,0,.08); }
.home-card:hover::before{ opacity: 1 }

.card-icon{
  width: 56px; height: 56px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
}
.card-dsp .card-icon{ background: rgba(59,130,246,.12); color: var(--accent-dsp) }
.card-sensor .card-icon{ background: rgba(59,130,246,.12); color: var(--accent-sensor) }

.home-card h2{
  font-size: 1.35rem; font-weight: 700; color: var(--text);
  margin-bottom: 6px;
}
.home-card .card-desc{
  font-size: .85rem; color: var(--text-3); margin-bottom: 8px;
}
.home-card .card-meta{
  font-size: .82rem; color: var(--text-2); margin-bottom: 14px; line-height: 1.5;
}

.card-badge{
  display: inline-block; font-size: .72rem;
  padding: 4px 10px; border-radius: 12px; margin-right: 6px; margin-bottom: 4px;
}
.dsp-badge{ background: rgba(59,130,246,.1); color: var(--accent-dsp) }
.sensor-badge{ background: rgba(59,130,246,.1); color: var(--accent-sensor) }
.cpp-badge{ background: rgba(139,92,246,.15); color: #8b5cf6 }
.stm32-badge{ background: rgba(6,182,212,.15); color: #06b6d4 }
.ds-badge{ background: rgba(245,158,11,.15); color: #f59e0b }


/* API动态卡片配色 — var(--card-color) 变量驱动 */
.api-cards .home-card::before {
  background: linear-gradient(90deg, var(--card-color), var(--card-color));
}
.api-cards .home-card .card-icon {
  background: var(--card-color-bg);
  color: var(--card-color);
}

/* Footer */
.home-footer{
  margin-top: 48px; text-align: center;
  font-size: .78rem; color: var(--text-3);
  opacity: .6;
}

/* Responsive */
@media (max-width: 640px) {
  .home-cards{ grid-template-columns: 1fr; max-width: 100%; gap: 18px; }
  .home-hero h1{ font-size: 1.6rem; }
  .home-hero{ padding: 20px 0 30px; }
  .home-hero .sub{ font-size: .85rem; }
  .home-card{ padding: 28px 24px !important; }
  .user-bar{ padding: 0 0 24px !important; }
}


/* === 书架卡片 === */
.card-bookshelf::before{ background: linear-gradient(90deg, #6366f1, #a78bfa) }
.card-bookshelf .card-icon{ background: rgba(99,102,241,.12); color: #818cf8 }
.bs-badge{ background: rgba(129,140,248,.15); color: #818cf8 }
@media(hover:hover){
  .card-bookshelf::before{ opacity: .6 }
}

/* === Global thin scrollbar === */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
html { scrollbar-width: thin; scrollbar-color: var(--border) transparent; }