/* ============================================================
   《多模态感知技术及应用》模拟教学环境 · 共享样式 v0.3
   双主题：浅色版（H3C 经典蓝）/ 深色版（深空实验室）
   右上角按钮切换，localStorage 记忆；默认深色。
   ============================================================ */
:root {
  /* —— 深色主题（默认：深空实验室）—— */
  --bg0: #040A16;
  --bg1: #081527;
  --card: rgba(12, 26, 48, 0.66);
  --card-solid: #0C1A30;
  --line: rgba(0, 229, 255, 0.14);
  --neon: #00E5FF;
  --blue: #1688FF;
  --deep: #0050B3;
  --ink: #EAF4FF;
  --ink-2: #8FA8C8;
  --ok: #2BE08B;
  --warn: #FFC24B;
  --err: #FF5C7A;
  --dot-off: #2A3B55;
  --topbar-bg: linear-gradient(90deg, rgba(4, 10, 22, 0.92), rgba(8, 26, 50, 0.92));
  --topbar-line: rgba(0, 229, 255, 0.22);
  --hero-bg: radial-gradient(600px 300px at 85% 0%, rgba(0, 229, 255, 0.16), transparent 60%),
             linear-gradient(120deg, rgba(0, 29, 74, 0.92), rgba(0, 80, 179, 0.55) 55%, rgba(0, 229, 255, 0.16));
  --hero-line: rgba(0, 229, 255, 0.28);
  --stage-bg: radial-gradient(ellipse at 50% 20%, rgba(0, 80, 179, 0.35) 0%, rgba(4, 12, 26, 0.9) 70%);
  --stage-line: rgba(0, 229, 255, 0.18);
  --terminal-bg: rgba(2, 8, 18, 0.85);
  --terminal-line: rgba(0, 229, 255, 0.14);
  --soft-bg: rgba(10, 26, 50, 0.5);
  --field-bg: rgba(143, 168, 200, 0.16);
  --arrow: rgba(0, 229, 255, 0.5);
  --ghost-bg: rgba(10, 26, 50, 0.6);
  --ghost-ink: #00E5FF;
  --ghost-line: rgba(0, 229, 255, 0.55);
  --grid-line: rgba(0, 229, 255, 0.045);
  --grid-mask: radial-gradient(ellipse at 50% 30%, #000 30%, transparent 80%);
  --radius: 16px;
}

/* —— 浅色主题（H3C 经典蓝）—— */
body.theme-light {
  --bg0: #F2F6FA;
  --bg1: #EAF2FA;
  --card: #FFFFFF;
  --card-solid: #FFFFFF;
  --line: #DCE6F0;
  --neon: #0070CC;
  --blue: #1688FF;
  --deep: #003D79;
  --ink: #16283B;
  --ink-2: #5B7085;
  --ok: #16A34A;
  --warn: #F59E0B;
  --err: #E11D48;
  --dot-off: #CBD5E1;
  --topbar-bg: linear-gradient(90deg, #003D79 0%, #0070CC 55%, #00A0E9 100%);
  --topbar-line: transparent;
  --hero-bg: linear-gradient(120deg, #003D79 0%, #0070CC 55%, #00A0E9 100%);
  --hero-line: transparent;
  --stage-bg: radial-gradient(ellipse at 50% 30%, #EAF2FA 0%, #D6E6F8 70%);
  --stage-line: #DCE6F0;
  --terminal-bg: #0B1B2B;
  --terminal-line: rgba(0, 112, 204, 0.25);
  --soft-bg: #F5F9FE;
  --field-bg: #E3EDF8;
  --arrow: rgba(0, 112, 204, 0.5);
  --ghost-bg: #FFFFFF;
  --ghost-ink: #0070CC;
  --ghost-line: #0070CC;
  --grid-line: rgba(0, 112, 204, 0.05);
  --grid-mask: radial-gradient(ellipse at 50% 30%, #000 30%, transparent 80%);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background:
    radial-gradient(1200px 800px at 85% -10%, rgba(0, 80, 179, 0.30), transparent 60%),
    radial-gradient(900px 600px at -10% 110%, rgba(0, 229, 255, 0.10), transparent 55%),
    linear-gradient(180deg, var(--bg0) 0%, var(--bg1) 100%);
  background-attachment: fixed;
  color: var(--ink);
  min-height: 100vh;
  transition: background 0.35s ease, color 0.35s ease;
}
body.theme-light {
  background:
    radial-gradient(1200px 800px at 85% -10%, rgba(0, 112, 204, 0.10), transparent 60%),
    linear-gradient(180deg, var(--bg0) 0%, var(--bg1) 100%);
}
/* 科技网格背景（深色主题可见） */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: var(--grid-mask);
  -webkit-mask-image: var(--grid-mask);
}
body.theme-light::before { opacity: 0.6; }
a { text-decoration: none; color: inherit; }

/* ---- 顶部导航 ---- */
.topbar {
  background: var(--topbar-bg);
  border-bottom: 1px solid var(--topbar-line);
  backdrop-filter: blur(12px);
  padding: 18px 40px;
  display: flex; align-items: center; justify-content: space-between;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
  position: sticky; top: 0; z-index: 20;
  transition: background 0.35s ease;
}
body.theme-light .topbar { box-shadow: 0 4px 18px rgba(0, 61, 121, 0.35); }
.topbar .brand { display: flex; align-items: center; gap: 14px; }
.topbar .logo {
  width: 42px; height: 42px; border-radius: 12px;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.22), rgba(22, 136, 255, 0.30));
  border: 1px solid rgba(0, 229, 255, 0.55);
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.35), inset 0 0 12px rgba(0, 229, 255, 0.15);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 21.5px; letter-spacing: -1px; color: #fff;
}
.topbar h1 { font-size: 21.5px; font-weight: 700; letter-spacing: 0.5px; color: #fff; }
.topbar .sub { font-size: 14px; color: rgba(255, 255, 255, 0.85); margin-top: 2px; }
.topbar .crumbs { font-size: 14.5px; color: rgba(255, 255, 255, 0.9); }
.topbar .crumbs a { color: #fff; border-bottom: 1px dashed rgba(255, 255, 255, 0.6); }
.top-right { display: flex; align-items: center; gap: 18px; }

/* ---- 主题切换按钮 ---- */
.theme-btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: #fff; border-radius: 999px;
  padding: 7px 14px; font-size: 14.5px; font-weight: 600;
  cursor: pointer; transition: all 0.2s ease;
}
.theme-btn:hover { background: rgba(255, 255, 255, 0.26); box-shadow: 0 0 14px rgba(0, 229, 255, 0.3); }

/* ---- 容器与卡片 ---- */
.wrap { max-width: 1180px; margin: 0 auto; padding: 28px 24px 60px; position: relative; z-index: 1; }
.card {
  background: var(--card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  padding: 22px 26px;
  position: relative;
  transition: background 0.35s ease, border-color 0.35s ease;
}
body.theme-light .card { box-shadow: 0 6px 24px rgba(0, 61, 121, 0.10); }
.card h2 {
  font-size: 17.5px; font-weight: 700; color: var(--neon);
  margin-bottom: 14px; display: flex; align-items: center; gap: 8px;
  letter-spacing: 0.5px;
}
.card h2::before {
  content: ""; width: 4px; height: 16px; border-radius: 2px;
  background: linear-gradient(180deg, var(--neon), var(--blue));
  box-shadow: 0 0 8px rgba(0, 229, 255, 0.6);
}

/* ---- 按钮 ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: none; cursor: pointer;
  border-radius: 10px;
  font-size: 16.5px; font-weight: 600;
  padding: 12px 22px;
  transition: all 0.18s ease;
  user-select: none;
  letter-spacing: 0.5px;
}
.btn:disabled { opacity: 0.38; cursor: not-allowed; filter: saturate(0.3); }
.btn-primary {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.90), rgba(22, 136, 255, 0.92));
  color: #04121F;
  box-shadow: 0 4px 18px rgba(0, 160, 255, 0.35);
}
body.theme-light .btn-primary {
  background: linear-gradient(135deg, #00A0E9, #0070CC);
  color: #fff;
}
.btn-primary:not(:disabled):hover { filter: brightness(1.12); transform: translateY(-1px); box-shadow: 0 6px 26px rgba(0, 200, 255, 0.5); }
.btn-ghost {
  background: var(--ghost-bg); color: var(--ghost-ink);
  border: 1.5px solid var(--ghost-line);
}
.btn-ghost:not(:disabled):hover { background: rgba(0, 229, 255, 0.10); box-shadow: 0 0 16px rgba(0, 229, 255, 0.25); }
.btn-danger {
  background: linear-gradient(135deg, rgba(255, 92, 122, 0.95), rgba(214, 32, 80, 0.95));
  color: #fff;
  box-shadow: 0 4px 18px rgba(255, 60, 100, 0.35);
}
.btn-danger:not(:disabled):hover { filter: brightness(1.08); box-shadow: 0 6px 26px rgba(255, 60, 100, 0.5); }
.btn-big { padding: 16px 30px; font-size: 18.5px; border-radius: 12px; }

/* ---- 状态灯 ---- */
.dot {
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--dot-off); display: inline-block; flex: none;
}
.dot.on { background: var(--ok); box-shadow: 0 0 10px 3px rgba(43, 224, 139, 0.45); }
.dot.rec { background: var(--warn); animation: pulse 1.1s infinite; }
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 4px 2px rgba(255, 194, 75, 0.3); }
  50% { box-shadow: 0 0 16px 7px rgba(255, 194, 75, 0.15); }
}

/* ---- 标签与徽标 ---- */
.tag {
  display: inline-block; padding: 3px 10px; border-radius: 999px;
  font-size: 13.5px; font-weight: 600; letter-spacing: 0.5px;
}
.tag-blue { background: rgba(22, 136, 255, 0.16); color: var(--neon); border: 1px solid rgba(0, 229, 255, 0.35); }
.tag-green { background: rgba(43, 224, 139, 0.14); color: var(--ok); border: 1px solid rgba(43, 224, 139, 0.35); }
.tag-gray { background: rgba(143, 168, 200, 0.12); color: var(--ink-2); border: 1px solid rgba(143, 168, 200, 0.25); }
.tag-orange { background: rgba(255, 194, 75, 0.14); color: var(--warn); border: 1px solid rgba(255, 194, 75, 0.35); }

/* ---- 日志区 ---- */
.logbox {
  background: var(--terminal-bg);
  border: 1px solid var(--terminal-line);
  border-radius: 12px; padding: 14px 16px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px; color: #A8E6FF; line-height: 1.75;
  height: 210px; overflow-y: auto;
}
.logbox .t { color: #5EEAD4; }
.logbox .h { color: #93C5FD; }
.logbox .warn { color: #FCD34D; }

/* ---- 页脚 ---- */
.footer {
  text-align: center; color: var(--ink-2); font-size: 14px;
  padding: 20px 0 40px; position: relative; z-index: 1;
}

/* ---- 提示消息 ---- */
.toast {
  position: fixed; top: 84px; left: 50%; transform: translateX(-50%);
  background: rgba(4, 12, 26, 0.94);
  border: 1px solid rgba(0, 229, 255, 0.4);
  color: #fff;
  padding: 12px 26px; border-radius: 12px; font-size: 15.5px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5), 0 0 20px rgba(0, 229, 255, 0.15);
  opacity: 0; pointer-events: none; transition: opacity 0.25s; z-index: 99;
}
.toast.show { opacity: 1; }