/* ============================================================
   液体火箭推力室设计程序 —— 样式
   视觉方向：深空试验台数据终端（CEA/ODE 工程计算工具气质）
   ============================================================ */

:root {
  --bg:        #0a1521;
  --bg-panel:  #0e1c2c;
  --bg-card:   #122238;
  --bg-input:  #0b1826;
  --bg-hover:  #162a41;
  --border:    #22374f;
  --border-soft:#1a2c40;
  --text:      #c9d6e4;
  --text-dim:  #7e93a9;
  --text-faint:#5a6f85;
  --accent:    #ff9e2c;
  --accent-soft: rgba(255, 158, 44, .12);
  --value:     #45d6b8;
  --warn:      #ffd166;
  --danger:    #ff6b6b;
  --mono: "JetBrains Mono", "Cascadia Code", "Source Code Pro", Consolas, "Courier New", monospace;
  --sans: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.5;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(1200px 500px at 85% -10%, rgba(255, 158, 44, .05), transparent 60%),
    radial-gradient(900px 420px at -10% 0%, rgba(69, 214, 184, .04), transparent 55%),
    var(--bg);
}

/* ---------- 顶栏 ---------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(18, 34, 56, .9), rgba(14, 28, 44, .7));
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(6px);
}

.brand h1 {
  margin: 0;
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .5px;
  color: #e8eef5;
}

.brand h1 .accent { color: var(--accent); }

.brand .sub {
  display: block;
  margin-top: 2px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--text-dim);
  letter-spacing: 1.5px;
}

.actions { display: flex; gap: 10px; align-items: center; }

.btn {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 16px;
  cursor: pointer;
  transition: border-color .15s, background .15s, color .15s;
}
.btn:hover { border-color: var(--accent); color: #fff; }

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #14100a;
  font-weight: 700;
  font-family: var(--mono);
}
.btn.primary:hover { background: #ffb052; color: #14100a; }

.btn.ghost { font-family: var(--mono); font-size: 12px; }

/* ---------- 主布局 ---------- */

.layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 18px;
  padding: 18px 22px 30px;
  max-width: 1560px;
  margin: 0 auto;
  align-items: start;
}

@media (max-width: 1080px) {
  .layout { grid-template-columns: 1fr; }
}

/* ---------- 面板 ---------- */

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  overflow: hidden;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-soft);
  background: rgba(18, 34, 56, .5);
}

.panel-head .t {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--text-dim);
  text-transform: uppercase;
}

/* ---------- 输入区：模块页签 ---------- */

.mod-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-soft);
}
.mod-tabs button {
  flex: 1;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  padding: 11px 6px 9px;
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
}
.mod-tabs button:hover { color: var(--text); }
.mod-tabs button.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  background: var(--accent-soft);
}

/* ---------- 输入表单 ---------- */

.in-form { display: none; padding: 12px 14px 18px; }
.in-form.active { display: block; }

.field-group { margin-bottom: 16px; }

.field-group-title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  color: var(--text-faint);
  text-transform: uppercase;
  margin: 0 0 8px;
  padding-bottom: 5px;
  border-bottom: 1px dashed var(--border-soft);
}

.field {
  display: grid;
  grid-template-columns: 1fr 96px 46px;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
}

.field label {
  font-size: 13px;
  color: var(--text);
  cursor: text;
}

.field input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--value);
  font-family: var(--mono);
  font-size: 13px;
  padding: 6px 8px;
  text-align: right;
  outline: none;
  transition: border-color .15s;
}
.field input:focus { border-color: var(--accent); }
.field input.invalid { border-color: var(--danger); }

.field select {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--value);
  font-size: 13px;
  padding: 6px 8px;
  outline: none;
}
.field select:focus { border-color: var(--accent); }

/* 边区冷却开关与置灰 */
.field.disabled { opacity: 0.45; }
.field.disabled input { pointer-events: none; background: #0a1120; color: var(--text-faint); }
.switch-field { grid-template-columns: 1fr 46px; }
.switch-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text);
  user-select: none;
}
.switch-label input[type="checkbox"] {
  width: 15px;
  height: 15px;
  accent-color: var(--accent);
  cursor: pointer;
}

.field .unit {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--text-faint);
  text-align: left;
}

.field .hint {
  grid-column: 1 / -1;
  font-size: 11.5px;
  color: var(--text-faint);
  margin-top: -2px;
}

/* ---------- 输出区 ---------- */

.out-panel { min-width: 0; }

.out-body {
  padding: 14px 16px 20px;
  display: none;
  gap: 16px;
}
.out-body.active { display: grid; }

/* 模块计算按钮 */
.calc-wrap { margin-top: 16px; }
.calc-btn {
  width: 100%;
  padding: 10px 16px;
  font-size: 13.5px;
  letter-spacing: 1px;
}

.result-card {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  overflow: hidden;
}

.rc-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-soft);
  background: linear-gradient(180deg, rgba(255, 158, 44, .06), transparent);
}

.rc-head .rc-title {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 14px;
  color: #e8eef5;
  letter-spacing: 1px;
}
.rc-head .rc-title .tag {
  display: inline-block;
  font-size: 10.5px;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 1px 7px;
  margin-left: 8px;
  letter-spacing: 1px;
  vertical-align: 1px;
}
.rc-head .rc-meta {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-faint);
}

.rc-body { padding: 10px 16px 16px; }

/* CEA 风格参数表 */
.data-grid {
  display: grid;
  grid-template-columns: minmax(190px, 1fr) auto auto;
  gap: 2px 18px;
  align-items: baseline;
  font-family: var(--mono);
  font-size: 13px;
}

.data-row { display: contents; }
.data-row .k { color: var(--text); }
.data-row .v { color: var(--value); text-align: right; font-weight: 500; }
.data-row .u { color: var(--text-faint); font-size: 11.5px; }

.data-sep {
  grid-column: 1 / -1;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 2px;
  color: var(--accent);
  text-transform: uppercase;
  border-top: 1px dashed var(--border-soft);
  margin-top: 10px;
  padding-top: 8px;
}
.data-sep:first-child { border-top: none; margin-top: 0; padding-top: 4px; }

.data-note {
  grid-column: 1 / -1;
  font-family: var(--sans);
  font-size: 11.5px;
  color: var(--text-faint);
  line-height: 1.5;
  padding: 2px 0 4px;
}

.schematic {
  margin: 14px 0 6px;
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  background: var(--bg-input);
  padding: 10px;
}
.schematic svg { display: block; width: 100%; height: auto; }
.schematic img { display: block; width: 100%; height: auto; border-radius: 4px; }
.img-row { display: flex; flex-wrap: wrap; gap: 8px; }
.img-row img { flex: 1 1 45%; min-width: 240px; object-fit: contain; background: #0c1424; }
.schematic .cap {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--text-faint);
  letter-spacing: 1px;
  margin-top: 6px;
  text-align: center;
}

.svg-dim { font-family: var(--mono); font-size: 11px; fill: var(--text-dim); }
.svg-dim-line { stroke: var(--text-faint); stroke-width: .6; stroke-dasharray: 3 3; }
.svg-label { font-family: var(--mono); font-size: 10.5px; fill: var(--accent); }
.svg-axis { stroke: var(--text-faint); stroke-width: 1; }
.svg-wall { stroke: var(--text); stroke-width: 1.8; fill: none; }
.svg-wall-dash { stroke: var(--text-dim); stroke-width: 1.4; fill: none; stroke-dasharray: 5 4; }
.svg-fill { fill: rgba(255, 158, 44, .10); }

/* ---------- 页脚 ---------- */

.footer {
  padding: 14px 22px 26px;
  max-width: 1560px;
  margin: 0 auto;
  font-size: 12px;
  color: var(--text-faint);
  line-height: 1.7;
  text-align: center;
}
.footer code { font-family: var(--mono); font-size: 11px; color: var(--text-dim); }

/* ---------- 提示条 ---------- */

.banner {
  margin: 14px 16px 0;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 12.5px;
  color: var(--text);
}
.banner b { color: var(--accent); font-family: var(--mono); font-weight: 600; }

.empty {
  padding: 26px 18px;
  text-align: center;
  color: var(--text-faint);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 1px;
  border: 1px dashed var(--border-soft);
  border-radius: 8px;
  background: var(--bg-input);
}

.toast {
  position: fixed;
  right: 22px;
  bottom: 22px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--value);
  color: var(--text);
  font-size: 13px;
  padding: 10px 16px;
  border-radius: 6px;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .25s, transform .25s;
  pointer-events: none;
  z-index: 50;
  font-family: var(--mono);
}
.toast.show { opacity: 1; transform: translateY(0); }