/* =========================================================
   Serial Console · 设计系统
   工业仪表台 / 深色主题 / WCAG AA 对比度
   ========================================================= */

/* ---------- 设计令牌 ---------- */
:root {
  /* 背景层（从深到浅） */
  --bg-900: #07090e;
  --bg-850: #0a0e14;
  --bg-800: #0f141d;
  --bg-700: #161c28;
  --bg-600: #1f2735;

  /* 边框 */
  --border: #232c3d;
  --border-strong: #324056;
  --border-soft: #1a2230;

  /* 文本（对比度全部满足 AA） */
  --text: #e8ecf2;        /* ~16:1 on bg-850 */
  --text-2: #aab3c4;      /* ~8:1 */
  --text-3: #7c8699;      /* ~5:1 */
  --text-4: #5a6376;      /* 装饰用 */

  /* 品牌色 */
  --amber: #ff8c42;       /* ~6.4:1 on bg-850 */
  --amber-soft: #ffa666;
  --amber-deep: #cc6e34;
  --phosphor: #3dd68c;    /* ~9:1 */
  --phosphor-soft: #5cf0a8;
  --alert: #ff6b6b;       /* ~5.4:1 */
  --info: #5ab0ff;

  /* 功能 */
  --radius: 10px;
  --radius-sm: 7px;
  --radius-lg: 16px;
  --container: 1140px;
  --header-h: 64px;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
  --shadow-glow-amber: 0 0 0 1px rgba(255, 140, 66, 0.25), 0 8px 30px rgba(255, 140, 66, 0.18);
  --shadow-glow-phosphor: 0 0 0 1px rgba(61, 214, 140, 0.25), 0 8px 30px rgba(61, 214, 140, 0.18);

  /* 字体 */
  --font-sans: "Sora", system-ui, -apple-system, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

/* ---------- 重置 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
}
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg-850);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img,
svg {
  max-width: 100%;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font: inherit;
  color: inherit;
}
ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
kbd {
  font-family: var(--font-mono);
  font-size: 0.75em;
  padding: 1px 5px;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  background: var(--bg-700);
  color: var(--text-2);
}

/* ---------- 无障碍 ---------- */
:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
  border-radius: 4px;
}
.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 100;
  background: var(--amber);
  color: #0a0e14;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
  transition: top 0.2s;
}
.skip-link:focus {
  top: 12px;
}
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- 布局 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}
.muted {
  color: var(--text-3);
}

/* ---------- 按钮 ---------- */
.btn {
  --btn-bg: var(--bg-700);
  --btn-fg: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.18s, border-color 0.18s, box-shadow 0.18s;
  white-space: nowrap;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn:active {
  transform: translateY(0);
}
.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}
.btn-primary {
  --btn-bg: var(--amber);
  --btn-fg: #0a0e14;
  border-color: var(--amber-soft);
  box-shadow: var(--shadow-glow-amber);
}
.btn-primary:hover {
  background: var(--amber-soft);
}
.btn-ghost {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover {
  background: var(--bg-700);
  border-color: var(--text-3);
}
.btn-lg {
  padding: 13px 24px;
  font-size: 1rem;
}
.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
}
.btn-block {
  width: 100%;
}
.btn[aria-pressed="true"] {
  background: var(--amber);
  color: #0a0e14;
  border-color: var(--amber-soft);
}
.btn[aria-pressed="false"] {
  background: var(--bg-700);
  color: var(--text-2);
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(10, 14, 20, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft);
}
.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(145deg, rgba(255, 140, 66, 0.18), rgba(255, 140, 66, 0.04));
  border: 1px solid rgba(255, 140, 66, 0.35);
  color: var(--amber);
}
.brand-accent {
  color: var(--amber);
}
.primary-nav {
  display: flex;
  align-items: center;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-menu a {
  padding: 8px 12px;
  border-radius: 7px;
  color: var(--text-2);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.15s, background 0.15s;
}
.nav-menu a:hover {
  color: var(--text);
  background: var(--bg-700);
}
.nav-cta {
  background: var(--amber);
  color: #0a0e14 !important;
  font-weight: 600 !important;
}
.nav-cta:hover {
  background: var(--amber-soft);
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}
.nav-toggle-bar {
  width: 18px;
  height: 2px;
  background: var(--text);
  transition: transform 0.2s, opacity 0.2s;
}

/* ---------- 控制台区 ---------- */
.console-section {
  padding: 40px 0 64px;
  background:
    radial-gradient(ellipse 70% 50% at 50% 0%, rgba(255, 140, 66, 0.06), transparent 70%),
    var(--bg-900);
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
}
.console-shell {
  background: var(--bg-850);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.console-statusbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: var(--bg-800);
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem;
  font-family: var(--font-mono);
}
.status-led {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--text-4);
  box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.5);
  transition: background 0.2s, box-shadow 0.2s;
}
.status-led.on {
  background: var(--phosphor);
  box-shadow: 0 0 8px var(--phosphor);
  animation: pulse 2s ease-in-out infinite;
}
.status-led.err {
  background: var(--alert);
  box-shadow: 0 0 8px var(--alert);
}
.status-text {
  font-weight: 600;
  color: var(--text);
}
.status-divider {
  width: 1px;
  height: 14px;
  background: var(--border-strong);
}
.status-meta {
  color: var(--text-3);
}
.status-spacer {
  flex: 1;
}
.status-badge {
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  border: 1px solid var(--border-strong);
  color: var(--text-3);
}
.status-badge.ok {
  color: var(--phosphor);
  border-color: rgba(61, 214, 140, 0.4);
  background: rgba(61, 214, 140, 0.08);
}
.status-badge.no {
  color: var(--alert);
  border-color: rgba(255, 107, 107, 0.4);
  background: rgba(255, 107, 107, 0.08);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.console-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border-soft);
}
.console-side {
  display: grid;
  gap: 1px;
  background: var(--border-soft);
}
.console-main {
  display: grid;
  grid-template-rows: 1fr auto;
  gap: 1px;
  background: var(--border-soft);
  min-width: 0;
}

/* 面板 */
.panel {
  background: var(--bg-850);
  padding: 16px;
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.panel-grow {
  min-height: 320px;
}
.panel-title {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-3);
  font-weight: 600;
  margin: 0 0 14px;
}
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.panel-head .panel-title {
  margin: 0;
}
.panel-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* 表单 */
.form-row {
  margin-bottom: 14px;
}
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.field-span2 {
  grid-column: span 2;
}
.field-label {
  font-size: 0.72rem;
  color: var(--text-3);
  font-weight: 500;
}
.input {
  height: 38px;
  padding: 0 10px;
  background: var(--bg-900);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.input:focus {
  outline: none;
  border-color: var(--amber);
  box-shadow: 0 0 0 3px rgba(255, 140, 66, 0.15);
}
.input-tiny {
  height: 28px;
  width: 72px;
  padding: 0 6px;
  font-size: 0.78rem;
}
select.input {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%237c8699' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
}

/* 分段开关 */
.seg {
  display: inline-flex;
  background: var(--bg-900);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 2px;
}
.seg-btn {
  padding: 4px 12px;
  background: transparent;
  border: none;
  border-radius: 5px;
  color: var(--text-3);
  font-size: 0.74rem;
  font-weight: 600;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.seg-btn.is-active {
  background: var(--amber);
  color: #0a0e14;
}

/* 复选框 */
.check {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-2);
  cursor: pointer;
}
.check input {
  accent-color: var(--amber);
  width: 15px;
  height: 15px;
}
.inline-timer {
  gap: 4px;
}
.inline-timer .input {
  margin-left: 2px;
}

/* 图标按钮 */
.icon-btn {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  background: var(--bg-900);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text-2);
  cursor: pointer;
  font-size: 0.95rem;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.icon-btn:hover {
  background: var(--bg-700);
  color: var(--text);
  border-color: var(--border-strong);
}
.icon-btn.is-active {
  color: var(--amber);
  border-color: rgba(255, 140, 66, 0.5);
}

/* 日志视图 */
.log-view {
  flex: 1;
  min-height: 240px;
  max-height: 420px;
  overflow: auto;
  margin: 0;
  padding: 14px;
  background: var(--bg-900);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--phosphor-soft);
  white-space: pre-wrap;
  word-break: break-all;
}
.log-view::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
.log-view::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 4px;
}
.log-line {
  display: block;
  padding: 1px 4px;
  border-radius: 3px;
}
.log-line.rx {
  color: var(--phosphor-soft);
}
.log-line.tx {
  color: var(--amber-soft);
}
.log-line .ts {
  color: var(--text-4);
  margin-right: 8px;
}
.log-line .dir {
  font-weight: 600;
  margin-right: 8px;
}
.log-line.rx .dir {
  color: var(--phosphor);
}
.log-line.tx .dir {
  color: var(--amber);
}
.log-empty {
  margin-top: -240px;
  height: 240px;
  display: grid;
  place-items: center;
  color: var(--text-4);
  font-size: 0.85rem;
  pointer-events: none;
  position: relative;
  z-index: 0;
}
.log-empty.hidden {
  display: none;
}

/* 发送区 */
.send-input {
  width: 100%;
  resize: vertical;
  min-height: 72px;
  padding: 12px;
  background: var(--bg-900);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.86rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.send-input:focus {
  outline: none;
  border-color: var(--amber);
  box-shadow: 0 0 0 3px rgba(255, 140, 66, 0.15);
}
.send-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
}
.hint {
  font-size: 0.78rem;
  color: var(--text-3);
  font-family: var(--font-mono);
}
.history {
  margin-top: 14px;
  border-top: 1px solid var(--border-soft);
  padding-top: 12px;
}
.history summary {
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--text-2);
  font-weight: 600;
  padding: 4px 0;
}
.history-list {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 160px;
  overflow: auto;
}
.history-list li button {
  width: 100%;
  text-align: left;
  padding: 8px 10px;
  background: var(--bg-900);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}
.history-list li button:hover {
  border-color: var(--amber);
  color: var(--text);
}
.history-list li .h-meta {
  color: var(--text-4);
  font-size: 0.7rem;
  margin-right: 8px;
}

/* 信号线 */
.signal-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 0 0 14px;
}
.signal-grid li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-2);
}
.signal-led {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--text-4);
  box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.5);
  transition: all 0.2s;
}
.signal-led.on {
  background: var(--phosphor);
  box-shadow: 0 0 8px var(--phosphor);
}
.signal-ctrl {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--border-soft);
  background: var(--bg-900);
  padding: 48px 0 24px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-soft);
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.footer-brand strong {
  font-size: 1.05rem;
}
.footer-brand p {
  margin: 2px 0 0;
  font-size: 0.85rem;
}
.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.footer-nav h4 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-3);
  margin: 0 0 12px;
}
.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-nav a {
  color: var(--text-2);
  font-size: 0.88rem;
  transition: color 0.15s;
}
.footer-nav a:hover {
  color: var(--amber);
}
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  padding-top: 20px;
  font-size: 0.8rem;
}

/* =========================================================
   响应式 · 移动优先断点
   ========================================================= */
@media (min-width: 860px) {
  .console-body {
    grid-template-columns: 280px 1fr;
  }
  .console-side {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
  }
  .footer-inner {
    grid-template-columns: 1fr 2fr;
  }
}

/* 移动端导航折叠 */
@media (max-width: 720px) {
  .nav-toggle {
    display: flex;
  }
  .nav-menu {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px;
    background: var(--bg-850);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.2s, opacity 0.2s;
  }
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-menu a {
    padding: 12px 14px;
    border-radius: 8px;
  }
  .nav-cta {
    text-align: center;
    margin-top: 4px;
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}