/* =====================================================================
 * style.css — 無人機通訊鏈路實驗室 / Drone Link Lab
 * 深色/淺色雙主題 · 玻璃感卡片 · 響應式 / Dark+light, glassy cards, responsive
 * ===================================================================== */

:root,
[data-theme='dark'] {
  --bg: #0b1220;
  --bg2: #0e1626;
  --panel: #131c2e;
  --panel2: #1b2740;
  --text: #e6edf6;
  --sub: #8da2be;
  --grid: #243049;
  --axis: #3a4a68;
  --border: #233149;
  --accent: #38bdf8;
  --accent2: #34d399;
  --good: #34d399;
  --warn: #fbbf24;
  --bad: #f43f5e;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}

[data-theme='light'] {
  --bg: #eef2f7;
  --bg2: #e7edf5;
  --panel: #ffffff;
  --panel2: #f5f8fc;
  --text: #0f172a;
  --sub: #5b6b85;
  --grid: #e4eaf1;
  --axis: #c3cedd;
  --border: #e2e8f0;
  --accent: #0284c7;
  --accent2: #059669;
  --good: #059669;
  --warn: #d97706;
  --bad: #e11d48;
  --shadow: 0 10px 28px rgba(15,40,80,.10);
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  background:
    radial-gradient(1200px 600px at 80% -10%, color-mix(in srgb, var(--accent) 12%, transparent), transparent),
    radial-gradient(1000px 500px at -10% 10%, color-mix(in srgb, var(--accent2) 10%, transparent), transparent),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.skip-link {
  position: absolute; left: -999px; top: 0; background: var(--accent); color: #fff;
  padding: 8px 14px; border-radius: 0 0 8px 0; z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---- header ---- */
.app-header {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 14px clamp(16px, 4vw, 40px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 14px; }
.logo {
  font-size: 30px; line-height: 1; filter: drop-shadow(0 2px 6px rgba(56,189,248,.4));
}
.app-header h1 { font-size: clamp(17px, 2.4vw, 22px); margin: 0; letter-spacing: .3px; }
.subtitle { margin: 2px 0 0; font-size: 12.5px; color: var(--sub); }
.header-actions { display: flex; gap: 8px; }
.ghost-btn {
  background: var(--panel2); color: var(--text); border: 1px solid var(--border);
  border-radius: 10px; padding: 8px 12px; cursor: pointer; font-size: 14px; font-weight: 600;
  transition: .15s; min-width: 42px;
}
.ghost-btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }

/* ---- tabs ---- */
.tabs {
  position: sticky; top: 60px; z-index: 20;
  display: flex; gap: 6px; padding: 10px clamp(16px, 4vw, 40px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  overflow-x: auto; scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tab {
  background: transparent; color: var(--sub); border: 1px solid transparent;
  border-radius: 10px; padding: 8px 14px; cursor: pointer; font-size: 14px; font-weight: 600;
  white-space: nowrap; transition: .15s;
}
.tab:hover { color: var(--text); background: var(--panel2); }
.tab.active { color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, transparent); border-color: color-mix(in srgb, var(--accent) 35%, transparent); }

/* ---- layout ---- */
main { max-width: 1120px; margin: 0 auto; padding: 22px clamp(14px, 4vw, 40px) 40px; }
.tab-panel { display: none; animation: fade .25s ease; }
.tab-panel.active { display: block; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.grid-2 { display: grid; grid-template-columns: 360px 1fr; gap: 18px; align-items: start; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 880px) {
  .grid-2 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
}

.card {
  background: linear-gradient(180deg, color-mix(in srgb, var(--panel) 96%, var(--accent) 4%), var(--panel));
  border: 1px solid var(--border); border-radius: 16px;
  padding: 18px; margin-bottom: 18px; box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 14px; font-size: 15px; letter-spacing: .3px; }
hr.soft { border: none; border-top: 1px dashed var(--border); margin: 16px 0; }

/* ---- controls ---- */
.seg {
  display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 4px;
  background: var(--panel2); border: 1px solid var(--border); border-radius: 12px; margin-bottom: 16px;
}
.seg-btn {
  background: transparent; color: var(--sub); border: none; border-radius: 9px;
  padding: 9px; cursor: pointer; font-weight: 600; font-size: 13.5px; transition: .15s;
}
.seg-btn.active { background: var(--accent); color: #04121f; box-shadow: 0 4px 12px color-mix(in srgb, var(--accent) 40%, transparent); }

.ctrl { margin-bottom: 14px; }
.ctrl > label {
  display: block; font-size: 11.5px; font-weight: 700; letter-spacing: .4px;
  text-transform: uppercase; color: var(--sub); margin-bottom: 6px;
}
.ctrl select {
  width: 100%; padding: 9px 10px; border-radius: 10px;
  background: var(--panel2); color: var(--text); border: 1px solid var(--border);
  font-size: 14px; cursor: pointer;
}
.ctrl select:focus { outline: 2px solid color-mix(in srgb, var(--accent) 50%, transparent); border-color: var(--accent); }
.ctrl.slider label { display: flex; justify-content: space-between; align-items: baseline; text-transform: none; }
.ctrl.slider output { font-variant-numeric: tabular-nums; color: var(--accent); font-weight: 700; font-size: 12.5px; }

input[type=range] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 6px;
  border-radius: 4px; background: var(--panel2); border: 1px solid var(--border); cursor: pointer;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--bg); box-shadow: 0 2px 8px rgba(0,0,0,.4); cursor: pointer;
}
input[type=range]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%; background: var(--accent);
  border: 3px solid var(--bg); cursor: pointer;
}

.sys-summary { font-size: 12.8px; color: var(--sub); margin: -4px 0 16px; line-height: 1.55; }
.sys-summary .cat {
  display: inline-block; font-weight: 700; color: var(--c, var(--accent));
  background: color-mix(in srgb, var(--c, var(--accent)) 16%, transparent);
  padding: 1px 8px; border-radius: 20px; margin-right: 6px; font-size: 11.5px;
}

/* ---- metrics ---- */
.metrics-card { min-height: 100%; }
.status-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 14px; }
.pill { font-size: 12px; font-weight: 700; padding: 4px 11px; border-radius: 20px; border: 1px solid var(--border); }
.pill.ok { color: var(--good); background: color-mix(in srgb, var(--good) 15%, transparent); border-color: color-mix(in srgb, var(--good) 40%, transparent); }
.pill.bad { color: var(--bad); background: color-mix(in srgb, var(--bad) 15%, transparent); border-color: color-mix(in srgb, var(--bad) 40%, transparent); }
.pill.subtle { color: var(--sub); background: var(--panel2); font-weight: 600; }
.caps { display: flex; flex-wrap: wrap; gap: 6px; margin-left: auto; }
.chip { font-size: 11.5px; font-weight: 600; padding: 3px 9px; border-radius: 8px; border: 1px solid var(--border); }
.chip.on { color: var(--accent2); border-color: color-mix(in srgb, var(--accent2) 40%, transparent); background: color-mix(in srgb, var(--accent2) 12%, transparent); }
.chip.off { color: var(--sub); opacity: .6; }
.chip.badge { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 35%, transparent); background: color-mix(in srgb, var(--accent) 10%, transparent); }

.metrics { display: grid; grid-template-columns: repeat(auto-fill, minmax(132px, 1fr)); gap: 10px; }
.metric-box {
  background: var(--panel2); border: 1px solid var(--border); border-radius: 12px;
  padding: 12px 13px; transition: .15s;
}
.metric-box:hover { border-color: color-mix(in srgb, var(--accent) 40%, transparent); transform: translateY(-2px); }
.metric-box.primary { grid-column: span 2; background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 12%, var(--panel2)), var(--panel2)); }
.m-label { font-size: 11px; color: var(--sub); font-weight: 600; letter-spacing: .3px; }
.m-value { font-size: 21px; font-weight: 800; margin-top: 4px; font-variant-numeric: tabular-nums; letter-spacing: -.3px; }
.metric-box.primary .m-value { font-size: 25px; color: var(--accent); }
.m-sub { font-size: 10.5px; color: var(--sub); margin-top: 3px; }
.metric-box.good .m-value { color: var(--good); }
.metric-box.warn .m-value { color: var(--warn); }
.metric-box.bad .m-value { color: var(--bad); }

canvas { width: 100%; display: block; }
.chart-note { font-size: 12px; color: var(--sub); margin: 10px 2px 0; }

/* ---- comparison ---- */
.cmp-pick { display: flex; flex-wrap: wrap; gap: 8px; }
.cmp-item {
  display: inline-flex; align-items: center; gap: 7px; cursor: pointer;
  background: var(--panel2); border: 1px solid var(--border); border-left: 3px solid var(--c);
  border-radius: 10px; padding: 7px 12px; font-size: 13px; font-weight: 600; transition: .15s;
}
.cmp-item:hover { border-color: var(--c); }
.cmp-item input { accent-color: var(--c); width: 15px; height: 15px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 9px 11px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { color: var(--sub); font-size: 11.5px; text-transform: uppercase; letter-spacing: .4px; font-weight: 700; position: sticky; top: 0; }
tbody tr:hover { background: color-mix(in srgb, var(--accent) 6%, transparent); }
td .dot, b .dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 7px; vertical-align: middle; }
.yes { color: var(--good); font-weight: 800; }
.no { color: var(--sub); opacity: .5; }
td .sub, .sub { color: var(--sub); font-size: 11px; }

/* ---- diagram (propagation) ---- */
.diagram {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 34px 18px; background:
    radial-gradient(circle at 50% 50%, color-mix(in srgb, var(--accent) 6%, transparent), transparent),
    var(--panel2);
  border: 1px solid var(--border); border-radius: 14px; margin: 6px 0 14px;
}
.node { text-align: center; font-size: 38px; line-height: 1; position: relative; z-index: 2; }
.node-label { font-size: 13px; color: var(--sub); font-weight: 700; margin-top: 8px; white-space: nowrap; }
.links-container { flex-grow: 1; display: flex; flex-direction: column; gap: 22px; position: relative; padding: 0 6px; }
.track { position: relative; height: 6px; border-radius: 4px; background: var(--grid); overflow: hidden; }
.track.integrated { height: 18px; background: color-mix(in srgb, var(--warn) 16%, var(--panel)); border: 1px solid color-mix(in srgb, var(--warn) 45%, transparent); }
.track-label { position: absolute; top: -17px; left: 50%; transform: translateX(-50%); font-size: 11.5px; color: var(--sub); white-space: nowrap; font-weight: 600; }
.track.integrated .track-label { color: var(--warn); top: -19px; }
.packet { position: absolute; height: 100%; border-radius: 4px; }
.packet-up { width: 26px; background: var(--bad); animation: moveRight 2s linear infinite; }
.packet-down { width: 26px; background: var(--accent); animation: moveLeft 2s linear infinite; }
.packet-video { width: 54px; background: #a855f7; animation: moveLeft 1s linear infinite; }
.packet-o3 { width: 70px; background: linear-gradient(90deg, var(--warn), #f97316); border-radius: 4px; animation: moveBoth 1.4s linear infinite; opacity: .9; }
@keyframes moveRight { 0% { left: -26px; } 100% { left: 100%; } }
@keyframes moveLeft { 0% { left: 100%; } 100% { left: -54px; } }
@keyframes moveBoth { 0% { left: -10%; width: 18%; } 50% { left: 42%; width: 26%; } 100% { left: 100%; width: 18%; } }
.prop-desc { font-size: 13.5px; color: var(--sub); margin: 4px 2px 0; line-height: 1.65; }

/* ---- about / formulas ---- */
.formulas { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; }
.formula { background: var(--panel2); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; }
.f-name { font-size: 12px; font-weight: 700; color: var(--accent); margin-bottom: 6px; }
.formula code { font-family: 'SF Mono', ui-monospace, Menlo, Consolas, monospace; font-size: 13px; color: var(--text); }
.formula code sub { font-size: 9px; }
.assume { margin: 0; padding-left: 20px; }
.assume li { font-size: 13.5px; color: var(--sub); margin-bottom: 9px; line-height: 1.6; }
.warn-card { border-color: color-mix(in srgb, var(--warn) 45%, transparent); background: color-mix(in srgb, var(--warn) 8%, var(--panel)); }
.warn-card p { margin: 0; font-size: 13.5px; line-height: 1.7; }

/* ---- footer ---- */
.app-footer { text-align: center; padding: 26px; color: var(--sub); font-size: 12.5px; border-top: 1px solid var(--border); }

@media (max-width: 560px) {
  .metric-box.primary { grid-column: span 2; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .app-header h1 { font-size: 16px; }
  .subtitle { display: none; }
}