/* ==========================================================================
   尼尔云 (nieryun.lol) — 复古未来主义工业硬件 · 琥珀磷光合成器终端 设计系统
   风格体系：Teenage Engineering / Braun Industrial Putty & CRT Amber Phosphor Hardware
   核心配色：#E6E2D8 (阳极氧化铝灰泥机壳) / #F2EFE9 (模压浅色键帽面板) / #161714 (深炭黑 CRT 显像管) /
             #1F211C (内凹终端卡槽) / #FF5722 (机械信号橙主控键) / #FFB000 (复古琥珀磷光) /
             #22C55E (终端在线 LED 绿) / #181816 (工业丝印黑墨) / #57564F (蚀刻副标灰)
   ========================================================================== */

:root {
  /* Required Hardware Palette */
  --hw-putty: #E6E2D8;
  --hw-panel: #F2EFE9;
  --crt-screen: #161714;
  --crt-card: #1F211C;
  --hw-orange: #FF5722;
  --hw-orange-hover: #E64A19;
  --crt-amber: #FFB000;
  --led-green: #22C55E;
  --ink-black: #181816;
  --ink-sub: #57564F;
  --keycap-shadow: 0 3px 0 #B8B2A6, 0 5px 12px rgba(24, 24, 22, 0.08);
  --keycap-orange-shadow: 0 3px 0 #9E2A0B, 0 5px 12px rgba(255, 87, 34, 0.25);
  --keycap-dark-shadow: 0 3px 0 #0A0B09, 0 5px 12px rgba(0, 0, 0, 0.3);
  --bevel-border: #C4BEB2;
  --chassis-screw: #A39D90;

  /* Compatibility & Semantic Aliases for Subpages */
  --bg-page: var(--hw-putty);
  --bg-surface: var(--hw-panel);
  --speed-paper: var(--hw-putty);
  --speed-surface: var(--hw-panel);
  --speed-asphalt: var(--ink-black);
  --speed-carbon: var(--crt-card);
  --speed-carbon-deep: var(--crt-screen);
  --speed-gold: var(--crt-amber);
  --speed-gold-glow: var(--hw-orange);
  --speed-alloy: #C4BEB2;
  --text-main: var(--ink-black);
  --text-secondary: #2E2D29;
  --text-muted: var(--ink-sub);
  --border-color: var(--ink-black);
  --border-hud: #B8B2A6;
  --accent-tint: #EAE5DA;

  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, "Courier New", monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --max-width: 1220px;
  --article-font-size: 1.02rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-sans);
  background-color: var(--hw-putty);
  background-image:
    radial-gradient(rgba(24, 24, 22, 0.12) 1px, transparent 1px),
    linear-gradient(to right, rgba(24, 24, 22, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(24, 24, 22, 0.03) 1px, transparent 1px);
  background-size: 20px 20px, 100px 100px, 100px 100px;
  color: var(--ink-black);
  line-height: 1.68;
  overflow-x: hidden;
  padding-bottom: 76px;
}

@media (min-width: 768px) {
  body {
    padding-bottom: 0;
  }
}

a {
  color: var(--ink-black);
  text-decoration: underline;
  text-decoration-color: var(--hw-orange);
  text-underline-offset: 4px;
  transition: color 0.12s ease, background-color 0.12s ease, transform 0.12s ease;
}

a:hover {
  color: var(--hw-orange);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px dashed var(--hw-orange);
  outline-offset: 3px;
}

.layout-container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* --------------------------------------------------------------------------
   顶部 CRT 琥珀磷光硬件状态横条 (CRT Amber Telemetry Ribbon)
   -------------------------------------------------------------------------- */
.hud-telemetry-ribbon {
  background-color: var(--crt-screen);
  color: var(--crt-amber);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  border-bottom: 2px solid var(--ink-black);
  position: relative;
  z-index: 150;
  box-shadow: inset 0 -2px 8px rgba(255, 176, 0, 0.08);
}

.hud-telemetry-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  padding: 0.45rem 0;
  gap: 0.85rem;
}

.hud-telemetry-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 1.15rem;
  align-items: center;
}

.hud-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--crt-amber);
  letter-spacing: 0.05em;
}

.hud-pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--led-green);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--led-green);
  display: inline-block;
}

.hud-quick-nav {
  display: none;
  gap: 1.25rem;
}

.hud-quick-nav a {
  color: #D6D2C4;
  text-decoration: none;
  font-family: var(--font-mono);
}

.hud-quick-nav a:hover {
  color: var(--crt-amber);
  text-decoration: underline;
}

@media (min-width: 768px) {
  .hud-quick-nav {
    display: flex;
  }
}

/* --------------------------------------------------------------------------
   复古未来主义工业硬件 · 机械键帽式导航栏 (Hardware Keycap Header)
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 140;
  background-color: rgba(230, 226, 216, 0.96);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--ink-black);
  box-shadow: 0 3px 0 #B8B2A6;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
  gap: 0.75rem;
}

.brand-emblem-link {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.4rem 1rem 0.4rem 0;
  border-right: 2px dotted #9E988B;
  text-decoration: none;
}

.brand-tachometer-badge {
  width: 42px;
  height: 42px;
  background-color: var(--crt-screen);
  border: 2px solid var(--ink-black);
  border-radius: 6px;
  box-shadow: var(--keycap-shadow);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-title {
  font-size: 1.28rem;
  font-weight: 900;
  color: var(--ink-black);
  letter-spacing: 0.04em;
}

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--ink-sub);
  letter-spacing: 0.06em;
}

/* Speaker grille decorative dots */
.speaker-grille {
  display: inline-grid;
  grid-template-columns: repeat(6, 4px);
  gap: 3px;
  padding: 4px;
}

.speaker-grille span {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background-color: var(--ink-black);
  opacity: 0.45;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  background: var(--hw-panel);
  border: 2px solid var(--ink-black);
  border-radius: 6px;
  box-shadow: var(--keycap-shadow);
  color: var(--ink-black);
  cursor: pointer;
}

.nav-toggle:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 #B8B2A6;
}

.nav-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--hw-panel);
  border-bottom: 3px solid var(--ink-black);
  padding: 1rem 1.25rem;
  flex-direction: column;
  gap: 0.5rem;
  box-shadow: 0 8px 20px rgba(24, 24, 22, 0.15);
}

.nav-menu.is-open {
  display: flex;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  min-height: 40px;
  padding: 0.35rem 0.75rem;
  background-color: var(--hw-panel);
  color: var(--ink-black);
  font-weight: 700;
  font-size: 0.86rem;
  text-decoration: none;
  border: 1.5px solid var(--ink-black);
  border-radius: 5px;
  box-shadow: var(--keycap-shadow);
  transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.1s ease;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  background-color: #FFFFFF;
  color: var(--hw-orange);
  transform: translateY(1px);
  box-shadow: 0 2px 0 #B8B2A6;
}

.nav-link:active {
  transform: translateY(3px);
  box-shadow: 0 0 0 #B8B2A6;
}

.nav-index-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--hw-orange);
  font-weight: 800;
}

@media (min-width: 960px) {
  .nav-toggle {
    display: none;
  }
  .nav-menu {
    position: static;
    display: flex;
    flex-direction: row;
    align-items: center;
    background: transparent;
    border-bottom: none;
    padding: 0;
    gap: 0.45rem;
    box-shadow: none;
  }
}

/* --------------------------------------------------------------------------
   Teenage Engineering 机械键帽式物理按钮 (Tactile 3D Keycap Buttons)
   -------------------------------------------------------------------------- */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.btn-primary,
.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 48px;
  padding: 0.7rem 1.55rem;
  background-color: var(--hw-orange);
  color: #FFFFFF;
  font-weight: 800;
  font-size: 0.96rem;
  letter-spacing: 0.03em;
  text-decoration: none;
  border: 2px solid var(--ink-black);
  border-radius: 6px;
  box-shadow: var(--keycap-orange-shadow);
  cursor: pointer;
  position: relative;
  transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.1s ease;
}

.btn-primary::before {
  content: "●";
  font-size: 0.65rem;
  color: #FFE0D6;
}

.nav-cta {
  min-height: 40px;
  padding: 0.35rem 1rem;
  margin-left: 0.25rem;
  font-size: 0.86rem;
}

.btn-primary:hover,
.nav-cta:hover {
  background-color: var(--hw-orange-hover);
  color: #FFFFFF;
  transform: translateY(1px);
  box-shadow: 0 2px 0 #9E2A0B, 0 3px 8px rgba(255, 87, 34, 0.22);
}

.btn-primary:active,
.nav-cta:active {
  transform: translateY(3px);
  box-shadow: 0 0 0 #9E2A0B;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.7rem 1.45rem;
  background-color: var(--hw-panel);
  color: var(--ink-black);
  font-weight: 800;
  font-size: 0.95rem;
  text-decoration: none;
  border: 2px solid var(--ink-black);
  border-radius: 6px;
  box-shadow: var(--keycap-shadow);
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.1s ease;
}

.btn-secondary:hover {
  background-color: #FFFFFF;
  color: var(--hw-orange);
  transform: translateY(1px);
  box-shadow: 0 2px 0 #B8B2A6;
}

.btn-secondary:active {
  transform: translateY(3px);
  box-shadow: 0 0 0 #B8B2A6;
}

/* --------------------------------------------------------------------------
   Hero: 合成器主控台与琥珀磷光示波器 (Hardware Synthesizer Console & CRT Scope)
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 2.25rem 0 3.5rem;
  border-bottom: 3px solid var(--ink-black);
}

.synth-chassis-frame {
  background-color: var(--hw-panel);
  border: 3px solid var(--ink-black);
  border-radius: 12px;
  box-shadow: 0 6px 0 #B8B2A6, 0 14px 32px rgba(24, 24, 22, 0.12);
  position: relative;
  overflow: hidden;
}

/* Top silkscreened metal bar */
.synth-top-bezel {
  background-color: #D8D3C6;
  border-bottom: 2px solid var(--ink-black);
  padding: 0.65rem 1.35rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-black);
}

.synth-bezel-left {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.hw-stamp-badge {
  background-color: var(--ink-black);
  color: var(--crt-amber);
  font-weight: 800;
  padding: 0.15rem 0.55rem;
  border-radius: 3px;
  letter-spacing: 0.05em;
}

.synth-stage-grid {
  padding: 2.25rem 1.5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
  align-items: stretch;
}

@media (min-width: 960px) {
  .synth-stage-grid {
    padding: 2.75rem 2.5rem;
    grid-template-columns: 1.12fr 0.88fr;
    gap: 2.75rem;
  }
}

.hw-serial-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--ink-sub);
  background-color: var(--hw-putty);
  border: 1.5px solid var(--ink-black);
  border-radius: 4px;
  padding: 0.2rem 0.65rem;
  margin-bottom: 1rem;
}

.hero-title {
  font-size: clamp(1.9rem, 3.8vw, 2.85rem);
  font-weight: 900;
  line-height: 1.22;
  color: var(--ink-black);
  margin-bottom: 1.1rem;
  letter-spacing: -0.01em;
}

.hero-subtitle {
  font-size: 1.06rem;
  color: var(--ink-sub);
  margin-bottom: 1.75rem;
  line-height: 1.7;
}

/* Hardware rotary/spec indicators row */
.hw-spec-meter-row {
  margin-top: 2rem;
  padding-top: 1.35rem;
  border-top: 2px dotted #B8B2A6;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.hw-spec-cell {
  background-color: var(--hw-putty);
  border: 1.5px solid var(--ink-black);
  border-radius: 6px;
  padding: 0.65rem 0.8rem;
  box-shadow: inset 0 2px 4px rgba(24, 24, 22, 0.06);
}

.hw-spec-code {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--ink-sub);
}

.hw-spec-val {
  display: block;
  font-size: 0.96rem;
  font-weight: 800;
  color: var(--ink-black);
  margin-top: 0.15rem;
}

/* Recessed Dark CRT Oscilloscope & Patch-Bay Panel */
.crt-monitor-bay {
  background-color: var(--crt-screen);
  border: 3px solid var(--ink-black);
  border-radius: 10px;
  padding: 1.35rem;
  box-shadow: inset 0 0 28px rgba(0, 0, 0, 0.85), 0 3px 0 #B8B2A6;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: var(--crt-amber);
}

.crt-monitor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px dashed rgba(255, 176, 0, 0.35);
  padding-bottom: 0.6rem;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.crt-monitor-title {
  color: var(--crt-amber);
  font-weight: 800;
  letter-spacing: 0.06em;
}

.crt-led-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--led-green);
  font-weight: 800;
}

/* Oscilloscope SVG Waveform Screen */
.crt-scope-window {
  background-color: #0E0F0C;
  border: 1.5px solid #33362E;
  border-radius: 6px;
  padding: 0.6rem;
  margin-bottom: 1rem;
  position: relative;
}

.crt-scope-svg {
  width: 100%;
  height: 76px;
  display: block;
}

/* Physical Patch-Bay Channel Selector Keycaps */
.gear-selector-box {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.gear-btn {
  background-color: var(--crt-card);
  border: 1.5px solid #4A4D43;
  border-radius: 5px;
  color: #A8A69D;
  padding: 0.55rem 0.35rem;
  cursor: pointer;
  text-align: center;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.78rem;
  box-shadow: 0 3px 0 #090A08;
  transition: all 0.1s ease;
}

.gear-btn:hover {
  border-color: var(--crt-amber);
  color: var(--crt-amber);
}

.gear-btn.is-active {
  background-color: var(--crt-amber);
  border-color: var(--ink-black);
  color: var(--ink-black);
  transform: translateY(2px);
  box-shadow: 0 1px 0 #090A08, 0 0 12px rgba(255, 176, 0, 0.4);
}

.gear-num {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 0.1rem;
}

.tachometer-display {
  background-color: var(--crt-card);
  border: 1px solid #353830;
  border-radius: 6px;
  padding: 0.9rem 1rem;
  margin-bottom: 1.1rem;
}

.tachometer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.38rem 0;
  border-bottom: 1px dashed rgba(255, 176, 0, 0.18);
  font-size: 0.82rem;
  gap: 0.5rem;
}

.tachometer-row:last-child {
  border-bottom: none;
}

.tachometer-label {
  color: #9E9C93;
  font-family: var(--font-mono);
  flex-shrink: 0;
}

.tachometer-value {
  color: var(--crt-amber);
  font-weight: 700;
  font-family: var(--font-mono);
  text-align: right;
}

/* --------------------------------------------------------------------------
   通用工业硬件模块章节头 (Industrial Hardware Unit Section Header)
   -------------------------------------------------------------------------- */
.page-section {
  padding: 4rem 0;
  border-bottom: 2px solid var(--ink-black);
}

.section-surface {
  background-color: var(--hw-panel);
}

.cinematic-scene-header {
  margin-bottom: 2.35rem;
  position: relative;
  padding: 1rem 1.35rem;
  background-color: var(--hw-panel);
  border: 2px solid var(--ink-black);
  border-left: 8px solid var(--hw-orange);
  border-radius: 6px;
  box-shadow: var(--keycap-shadow);
}

.section-surface .cinematic-scene-header {
  background-color: var(--hw-putty);
}

.scene-tape-meta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--crt-amber);
  background-color: var(--crt-screen);
  padding: 0.2rem 0.65rem;
  border-radius: 3px;
  margin-bottom: 0.55rem;
  letter-spacing: 0.05em;
}

.section-title {
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  font-weight: 900;
  color: var(--ink-black);
  line-height: 1.28;
  margin-bottom: 0.45rem;
}

.section-lead {
  font-size: 0.98rem;
  color: var(--ink-sub);
  max-width: 52rem;
}

/* --------------------------------------------------------------------------
   [UNIT 01] 四路硬件级传输保障 (4 Hardware Spec Modules)
   -------------------------------------------------------------------------- */
.feature-dyno-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.35rem;
}

@media (min-width: 680px) {
  .feature-dyno-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.feature-dyno-card {
  background-color: var(--hw-panel);
  border: 2px solid var(--ink-black);
  border-radius: 8px;
  padding: 1.65rem;
  box-shadow: var(--keycap-shadow);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.feature-dyno-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 0 #B8B2A6, 0 8px 18px rgba(24, 24, 22, 0.12);
  border-color: var(--hw-orange);
}

.dyno-sensor-tag {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 800;
  color: var(--ink-sub);
  background-color: var(--hw-putty);
  border: 1px solid var(--ink-black);
  border-radius: 4px;
  padding: 0.3rem 0.65rem;
  margin-bottom: 1rem;
}

.sensor-code {
  color: var(--hw-orange);
}

.feature-title {
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--ink-black);
  margin-bottom: 0.55rem;
}

.feature-desc {
  font-size: 0.94rem;
  color: var(--ink-sub);
  line-height: 1.68;
}

/* --------------------------------------------------------------------------
   [UNIT 02] 全天候真实工况实录 (4 User Scenarios & Rotary Mode Switcher)
   -------------------------------------------------------------------------- */
.drive-mode-console {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 820px) {
  .drive-mode-console {
    grid-template-columns: 270px 1fr;
  }
}

.drive-mode-shifter-strip {
  background-color: var(--crt-screen);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  border: 2px solid var(--ink-black);
  border-radius: 8px;
  box-shadow: var(--keycap-shadow);
}

.drive-mode-btn {
  width: 100%;
  min-height: 46px;
  padding: 0.6rem 0.9rem;
  background-color: var(--crt-card);
  border: 1.5px solid #3E4138;
  border-radius: 5px;
  color: #D0CEC4;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.84rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.12s ease;
}

.drive-mode-btn:hover {
  border-color: var(--crt-amber);
  color: var(--crt-amber);
}

.drive-mode-btn.is-active {
  background-color: var(--hw-orange);
  color: #FFFFFF;
  border-color: var(--ink-black);
  font-weight: 800;
}

.scenario-display-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 680px) {
  .scenario-display-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.scenario-card {
  background-color: var(--hw-putty);
  border: 2px solid var(--ink-black);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: var(--keycap-shadow);
  transition: all 0.15s ease;
}

.scenario-card.is-spotlight {
  border-color: var(--hw-orange);
  background-color: #FFFFFF;
  box-shadow: 0 0 0 2px var(--hw-orange), var(--keycap-shadow);
}

.scenario-gear-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 800;
  background-color: var(--crt-screen);
  color: var(--crt-amber);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 0.7rem;
}

.scenario-title {
  font-size: 1.16rem;
  font-weight: 900;
  color: var(--ink-black);
  margin-bottom: 0.5rem;
}

.scenario-desc {
  font-size: 0.92rem;
  color: var(--ink-sub);
}

/* --------------------------------------------------------------------------
   [UNIT 03] 可插拔流量配额模块 (3 Modular Pricing Units)
   -------------------------------------------------------------------------- */
.pricing-chassis-stack {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 920px) {
  .pricing-chassis-stack {
    grid-template-columns: repeat(3, 1fr);
    align-items: stretch;
  }
}

.plan-card {
  background-color: var(--hw-panel);
  border: 2.5px solid var(--ink-black);
  border-radius: 10px;
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.35rem;
  box-shadow: var(--keycap-shadow);
  position: relative;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.plan-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 0 #B8B2A6, 0 10px 22px rgba(24, 24, 22, 0.12);
}

.plan-card-featured {
  background-color: var(--crt-screen);
  color: #F2EFE9;
  border-color: var(--hw-orange);
  box-shadow: 0 6px 0 #181816, 0 12px 28px rgba(24, 24, 22, 0.22);
}

.plan-power-col {
  border-bottom: 2px dotted #B8B2A6;
  padding-bottom: 1.1rem;
}

.plan-card-featured .plan-power-col {
  border-bottom-color: rgba(255, 176, 0, 0.3);
}

.plan-badge {
  display: inline-block;
  background-color: var(--hw-putty);
  color: var(--ink-black);
  border: 1.5px solid var(--ink-black);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 800;
  padding: 0.2rem 0.6rem;
  margin-bottom: 0.65rem;
}

.plan-card-featured .plan-badge {
  background-color: var(--hw-orange);
  color: #FFFFFF;
  border-color: var(--hw-orange);
}

.plan-audience {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--ink-sub);
  margin-bottom: 0.3rem;
}

.plan-card-featured .plan-audience {
  color: var(--crt-amber);
}

.plan-name {
  font-size: 1.38rem;
  font-weight: 900;
  color: var(--ink-black);
  margin-bottom: 0.5rem;
}

.plan-card-featured .plan-name {
  color: #FFFFFF;
}

.plan-price {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--ink-black);
}

.plan-card-featured .plan-price {
  color: var(--crt-amber);
}

.plan-period {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--ink-sub);
}

.plan-card-featured .plan-period {
  color: #B8B2A6;
}

.plan-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  flex-grow: 1;
}

.plan-list li {
  font-size: 0.92rem;
  color: var(--ink-black);
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
}

.plan-card-featured .plan-list li {
  color: #E6E2D8;
}

.plan-check {
  color: var(--hw-orange);
  font-family: var(--font-mono);
  font-weight: 900;
  flex-shrink: 0;
}

.plan-card-featured .plan-check {
  color: var(--led-green);
}

.plan-launch-col {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  align-items: stretch;
}

/* --------------------------------------------------------------------------
   [UNIT 04] 跨洋视听解码器与 AI 算力端口 (Streaming & AI Patch Ports)
   -------------------------------------------------------------------------- */
.patch-bay-subhead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 2rem 0 1rem;
  padding-bottom: 0.55rem;
  border-bottom: 2px solid var(--ink-black);
}

.patch-bay-subhead:first-of-type {
  margin-top: 0;
}

.patch-bay-label {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 900;
  color: var(--ink-black);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.telemetry-filter-dock {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.filter-chip-btn {
  min-height: 38px;
  padding: 0.4rem 1rem;
  background-color: var(--hw-panel);
  border: 1.5px solid var(--ink-black);
  border-radius: 5px;
  color: var(--ink-black);
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.82rem;
  cursor: pointer;
  box-shadow: var(--keycap-shadow);
  transition: all 0.1s ease;
}

.filter-chip-btn.is-active {
  background-color: var(--crt-screen);
  color: var(--crt-amber);
  border-color: var(--ink-black);
  transform: translateY(1px);
  box-shadow: 0 1px 0 #B8B2A6;
}

.platform-matrix {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}

@media (min-width: 600px) {
  .platform-matrix {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .platform-matrix {
    grid-template-columns: repeat(3, 1fr);
  }
}

.platform-item {
  background-color: var(--crt-card);
  color: #E6E2D8;
  border: 2px solid var(--ink-black);
  border-radius: 8px;
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.65rem;
  box-shadow: var(--keycap-shadow);
  transition: transform 0.12s ease, border-color 0.12s ease;
}

.platform-item:hover {
  transform: translateY(-2px);
  border-color: var(--crt-amber);
}

.platform-item.is-hidden {
  display: none;
}

.platform-hud-telemetry {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--crt-amber);
  border-bottom: 1px dashed rgba(255, 176, 0, 0.25);
  padding-bottom: 0.4rem;
}

.platform-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.platform-head h3,
.platform-head span {
  font-size: 1.05rem;
  font-weight: 800;
  color: #FFFFFF;
  margin: 0;
}

.platform-icon {
  width: 22px;
  height: 22px;
  color: var(--led-green);
  flex-shrink: 0;
}

.platform-note {
  font-size: 0.88rem;
  color: #C4BEB2;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   [UNIT 05] 专线信道与普通直连示波器对比 (Comparison Table)
   -------------------------------------------------------------------------- */
.benefit-table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 2.5px solid var(--ink-black);
  border-radius: 8px;
  background-color: var(--hw-panel);
  box-shadow: var(--keycap-shadow);
}

.benefit-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 580px;
}

.benefit-table th,
.benefit-table td {
  padding: 1.05rem 1.25rem;
  text-align: left;
  border-bottom: 1.5px solid #C4BEB2;
  border-right: 1.5px solid #C4BEB2;
  font-size: 0.93rem;
}

.benefit-table th {
  background-color: var(--crt-screen);
  color: var(--crt-amber);
  font-family: var(--font-mono);
  font-weight: 800;
  letter-spacing: 0.03em;
}

.benefit-highlight {
  font-weight: 800;
  color: var(--ink-black);
  background-color: #FFF3D1;
}

/* --------------------------------------------------------------------------
   [UNIT 06] 硬件面板故障自检与答疑 (6 FAQ Items)
   -------------------------------------------------------------------------- */
.faq-chassis-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

@media (min-width: 900px) {
  .faq-chassis-grid {
    grid-template-columns: 310px 1fr;
  }
}

.faq-crew-card {
  background-color: var(--crt-screen);
  color: #E6E2D8;
  padding: 1.65rem;
  border: 2.5px solid var(--ink-black);
  border-top: 6px solid var(--hw-orange);
  border-radius: 8px;
  box-shadow: var(--keycap-shadow);
}

.faq-crew-title {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--crt-amber);
  margin-bottom: 0.85rem;
}

.faq-crew-card p {
  font-size: 0.9rem;
  color: #C4BEB2;
  margin-bottom: 1.15rem;
  line-height: 1.68;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.faq-item {
  background-color: var(--hw-panel);
  border: 2px solid var(--ink-black);
  border-radius: 6px;
  box-shadow: var(--keycap-shadow);
}

.faq-question {
  width: 100%;
  min-height: 54px;
  padding: 1rem 1.25rem;
  font-weight: 800;
  font-size: 0.98rem;
  color: var(--ink-black);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-indicator {
  width: 28px;
  height: 28px;
  background-color: var(--crt-screen);
  color: var(--crt-amber);
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: 1.05rem;
  flex-shrink: 0;
}

.faq-answer {
  padding: 0.95rem 1.25rem 1.25rem;
  color: var(--ink-sub);
  font-size: 0.94rem;
  border-top: 1.5px dashed #B8B2A6;
  background-color: #FAF8F3;
  border-radius: 0 0 6px 6px;
}

/* --------------------------------------------------------------------------
   [UNIT 07] 总控台通电启动区 (Final CTA)
   -------------------------------------------------------------------------- */
.final-cta-section {
  padding: 4rem 0;
  background-color: var(--crt-screen);
  border-top: 3px solid var(--ink-black);
  color: #F2EFE9;
}

.final-cta-capsule {
  border: 2px solid var(--crt-amber);
  border-radius: 10px;
  padding: 2.75rem 1.5rem;
  text-align: center;
  max-width: 54rem;
  margin: 0 auto;
  background-color: var(--crt-card);
  box-shadow: inset 0 0 32px rgba(0, 0, 0, 0.6);
}

.final-cta-title {
  font-size: clamp(1.55rem, 3.2vw, 2.2rem);
  font-weight: 900;
  color: var(--crt-amber);
  margin-bottom: 0.9rem;
}

.final-cta-desc {
  font-size: 1.02rem;
  color: #D6D2C4;
  max-width: 40rem;
  margin: 0 auto 1.75rem;
}

/* --------------------------------------------------------------------------
   子页面与硬件工程说明书编排 (Subpages & Hardware Engineering Manual Layout)
   -------------------------------------------------------------------------- */
.breadcrumb-bar {
  padding: 0.75rem 0;
  border-bottom: 2px solid var(--ink-black);
  background-color: #DBD6CA;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 700;
}

.breadcrumb-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.guide-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.65rem;
}

@media (min-width: 768px) {
  .guide-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.guide-card {
  background-color: var(--hw-panel);
  border: 2.5px solid var(--ink-black);
  border-radius: 8px;
  box-shadow: var(--keycap-shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.guide-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 0 #B8B2A6, 0 12px 24px rgba(24, 24, 22, 0.12);
}

.guide-card.is-hidden {
  display: none;
}

.guide-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-bottom: 2px solid var(--ink-black);
  background-color: var(--hw-panel);
}

.guide-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex-grow: 1;
}

.guide-meta {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--ink-sub);
  margin-bottom: 0.7rem;
  display: flex;
  justify-content: space-between;
  border-bottom: 1px dashed #B8B2A6;
  padding-bottom: 0.4rem;
}

.guide-card-title {
  font-size: 1.18rem;
  font-weight: 900;
  margin-bottom: 0.6rem;
  line-height: 1.35;
}

.guide-card-title a {
  color: var(--ink-black);
  text-decoration: none;
}

.guide-card-title a:hover {
  color: var(--hw-orange);
  text-decoration: underline;
}

.guide-excerpt {
  font-size: 0.92rem;
  color: var(--ink-sub);
  margin-bottom: 1.25rem;
}

.guide-read-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0.4rem 1.1rem;
  background-color: var(--crt-screen);
  color: var(--crt-amber);
  border: 1.5px solid var(--ink-black);
  border-radius: 5px;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.84rem;
  text-decoration: none;
  box-shadow: 0 2px 0 #B8B2A6;
}

.guide-read-link:hover {
  background-color: var(--hw-orange);
  color: #FFFFFF;
}

.article-shell {
  padding: 2.25rem 0 4rem;
}

.article-dossier-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  align-items: start;
}

@media (min-width: 1040px) {
  .article-dossier-grid {
    grid-template-columns: 235px 1fr 245px;
    gap: 1.75rem;
  }
}

.dossier-sidebar-rail {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

@media (min-width: 1040px) {
  .dossier-sidebar-rail {
    position: sticky;
    top: 86px;
  }
}

.rail-widget-card {
  background-color: var(--hw-panel);
  border: 2px solid var(--ink-black);
  border-radius: 8px;
  box-shadow: var(--keycap-shadow);
  padding: 1.15rem;
}

.rail-widget-title {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 800;
  color: var(--ink-black);
  padding-bottom: 0.45rem;
  margin-bottom: 0.7rem;
  border-bottom: 2px solid var(--hw-orange);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.toc-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.toc-nav-link {
  display: block;
  font-size: 0.82rem;
  color: var(--ink-sub);
  text-decoration: none;
  padding: 0.35rem 0.55rem;
  border-left: 3px solid #C4BEB2;
  line-height: 1.42;
}

.toc-nav-link:hover,
.toc-nav-link.is-active {
  color: var(--ink-black);
  font-weight: 800;
  background-color: var(--hw-putty);
  border-left: 3px solid var(--hw-orange);
}

.font-size-controls {
  display: flex;
  gap: 0.4rem;
}

.font-size-btn {
  flex: 1;
  min-height: 36px;
  background-color: var(--hw-putty);
  border: 1.5px solid var(--ink-black);
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--ink-black);
  cursor: pointer;
}

.font-size-btn.is-active {
  background-color: var(--crt-screen);
  color: var(--crt-amber);
}

.article-box {
  background-color: var(--hw-panel);
  border: 2.5px solid var(--ink-black);
  border-radius: 10px;
  padding: 1.75rem 1.35rem;
  box-shadow: var(--keycap-shadow);
}

@media (min-width: 768px) {
  .article-box {
    padding: 2.5rem 2.85rem;
  }
}

.article-header {
  margin-bottom: 1.85rem;
  padding-bottom: 1.25rem;
  border-bottom: 3px solid var(--ink-black);
}

.article-doc-stamp {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 800;
  color: var(--crt-amber);
  background-color: var(--crt-screen);
  padding: 0.2rem 0.65rem;
  border-radius: 4px;
  margin-bottom: 0.75rem;
}

.article-title {
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 0.9rem;
  color: var(--ink-black);
}

.article-byline {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-sub);
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.5rem;
  background-color: var(--hw-putty);
  padding: 0.6rem 0.9rem;
  border-left: 4px solid var(--hw-orange);
  border-radius: 0 4px 4px 0;
}

.article-content {
  font-size: var(--article-font-size);
}

.article-content > p:first-of-type {
  background-color: var(--hw-putty);
  border: 1.5px solid var(--ink-black);
  border-left: 5px solid var(--hw-orange);
  border-radius: 6px;
  padding: 1.15rem 1.35rem;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--ink-black);
}

.article-content h2 {
  font-size: 1.28rem;
  font-weight: 900;
  margin: 2.15rem 0 0.95rem;
  padding: 0.5rem 0.9rem;
  background-color: var(--hw-putty);
  border-left: 5px solid var(--hw-orange);
  border-bottom: 2px solid var(--ink-black);
  color: var(--ink-black);
  scroll-margin-top: 90px;
}

.article-content h3 {
  font-size: 1.08rem;
  font-weight: 800;
  margin: 1.35rem 0 0.55rem;
  color: var(--ink-black);
}

.article-content p {
  margin-bottom: 1.15rem;
  color: #2E2D29;
}

.article-content ul,
.article-content ol {
  margin: 0.8rem 0 1.35rem 1.35rem;
  color: #2E2D29;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-cta-panel {
  margin: 2.25rem 0;
  padding: 1.65rem;
  background-color: var(--hw-putty);
  border: 2px solid var(--ink-black);
  border-left: 8px solid var(--hw-orange);
  border-radius: 8px;
  box-shadow: var(--keycap-shadow);
}

.article-related {
  margin-top: 2.25rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--ink-black);
}

/* --------------------------------------------------------------------------
   Footer & Mobile Sticky CTA
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--crt-screen);
  border-top: 3px solid var(--ink-black);
  padding: 2.5rem 0;
  font-size: 0.86rem;
  color: #A8A69D;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.65rem;
}

.footer-nav a {
  color: var(--crt-amber);
  font-family: var(--font-mono);
  font-weight: 700;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.footer-nav a:hover {
  color: var(--hw-orange);
  text-decoration: underline;
}

.footer-disclosure {
  font-size: 0.82rem;
  color: #9E9C93;
  padding-top: 0.75rem;
  border-top: 1px dashed #353830;
}

.mobile-sticky-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 130;
  background-color: var(--crt-screen);
  border-top: 2.5px solid var(--hw-orange);
  padding: 0.6rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  transform: translateY(100%);
  transition: transform 0.2s ease;
}

.mobile-sticky-bar.is-visible {
  transform: translateY(0);
}

.mobile-sticky-text {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 800;
  color: var(--crt-amber);
}

.mobile-sticky-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0.4rem 1.1rem;
  background-color: var(--hw-orange);
  color: #FFFFFF;
  font-weight: 800;
  font-size: 0.84rem;
  text-decoration: none;
  border: 1.5px solid var(--ink-black);
  border-radius: 5px;
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .mobile-sticky-bar {
    display: none;
  }
}