/* ==========================================================================
   秒秒云 网络服务 - MECHANICAL PUZZLE-WORKSHOP DESIGN SYSTEM
   Palette: Warm Stone (#EAE5DB), Carbon (#272727), Copper (#A76543), Petrol Blue (#275D68)
   ========================================================================== */

:root {
  --color-warm-stone: #EAE5DB;
  --color-stone-light: #F6F3ED;
  --color-stone-card: #F0ECE3;
  --color-stone-dark: #DDD6C7;
  --border-stone: #CECA8;
  --border-stone-solid: #D5CEBF;

  --color-carbon: #272727;
  --color-carbon-deep: #191919;
  --color-carbon-soft: #383838;
  --color-carbon-muted: #5E5A54;
  --color-carbon-subtle: #7A756E;

  --color-copper: #A76543;
  --color-copper-light: #C27A54;
  --color-copper-dark: #7D4528;
  --color-copper-tint: rgba(167, 101, 67, 0.12);

  --color-petrol: #275D68;
  --color-petrol-light: #377785;
  --color-petrol-dark: #19434C;
  --color-petrol-tint: rgba(39, 93, 104, 0.12);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, "Liberation Mono", Menlo, Courier, monospace;

  --shadow-workshop-sm: 0 2px 4px rgba(39, 39, 39, 0.08);
  --shadow-workshop: 0 6px 16px rgba(39, 39, 39, 0.09), 0 1px 3px rgba(39, 39, 39, 0.06);
  --shadow-workshop-lg: 0 12px 28px rgba(39, 39, 39, 0.12), 0 2px 6px rgba(39, 39, 39, 0.08);

  --border-radius-sm: 3px;
  --border-radius: 6px;
  --border-radius-lg: 10px;

  --max-width: 1280px;
}

/* Base Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-warm-stone);
  color: var(--color-carbon);
  line-height: 1.68;
  font-size: 1rem;
  background-image: 
    linear-gradient(rgba(39, 39, 39, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(39, 39, 39, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  background-position: -1px -1px;
  position: relative;
  min-height: 100vh;
}

/* Accessibility Focus Outline */
:focus-visible {
  outline: 2px solid var(--color-petrol);
  outline-offset: 3px;
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

/* Mechanical Monospace Badges & Technical Accents */
.mono-spec {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-carbon-muted);
}

.workshop-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--border-stone-solid);
  background-color: var(--color-stone-card);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-petrol);
  border-radius: var(--border-radius-sm);
}
.workshop-tag::before {
  content: "■";
  color: var(--color-copper);
  font-size: 0.65rem;
}

.copper-tag {
  color: var(--color-copper-dark);
  border-color: rgba(167, 101, 67, 0.35);
  background-color: var(--color-copper-tint);
}

/* Header & Precision Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(234, 229, 219, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--color-carbon);
  box-shadow: 0 1px 0 rgba(167, 101, 67, 0.3);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 900;
  font-size: 1.22rem;
  letter-spacing: -0.02em;
  color: var(--color-carbon-deep);
}
.brand-logo svg {
  flex-shrink: 0;
}
.brand-title {
  display: flex;
  flex-direction: column;
}
.brand-title-main {
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.15;
}
.brand-title-sub {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--color-copper);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 1.35rem;
}

.nav-link {
  font-size: 0.93rem;
  font-weight: 600;
  color: var(--color-carbon-soft);
  position: relative;
  padding: 0.25rem 0.15rem;
}
.nav-link:hover {
  color: var(--color-copper);
}
.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-copper);
  transition: width 0.2s ease;
}
.nav-link:hover::after {
  width: 100%;
}

.header-cta-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-cta-mobile {
  display: none;
}

/* Mechanical Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.65rem 1.35rem;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  text-align: center;
  border: 2px solid transparent;
  gap: 0.5rem;
  position: relative;
  line-height: 1.25;
}

.btn-primary {
  background-color: var(--color-copper);
  color: var(--color-stone-light);
  border-color: var(--color-copper-dark);
  box-shadow: 2px 2px 0 var(--color-carbon);
}
.btn-primary:hover {
  background-color: var(--color-copper-light);
  transform: translateY(-1px);
  box-shadow: 3px 3px 0 var(--color-carbon);
  color: #fff;
}
.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 1px 1px 0 var(--color-carbon);
}

.btn-secondary {
  background-color: var(--color-petrol);
  color: var(--color-stone-light);
  border-color: var(--color-petrol-dark);
  box-shadow: 2px 2px 0 var(--color-carbon);
}
.btn-secondary:hover {
  background-color: var(--color-petrol-light);
  transform: translateY(-1px);
  box-shadow: 3px 3px 0 var(--color-carbon);
  color: #fff;
}
.btn-secondary:active {
  transform: translateY(1px);
  box-shadow: 1px 1px 0 var(--color-carbon);
}

.btn-outline {
  background-color: var(--color-stone-card);
  color: var(--color-carbon);
  border-color: var(--color-carbon);
  box-shadow: 2px 2px 0 rgba(39, 39, 39, 0.4);
}
.btn-outline:hover {
  background-color: var(--color-warm-stone);
  color: var(--color-copper);
  border-color: var(--color-copper);
  transform: translateY(-1px);
  box-shadow: 3px 3px 0 var(--color-copper);
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
}

/* Mobile Hamburger Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-carbon);
  border-radius: var(--border-radius-sm);
  padding: 0.45rem;
  cursor: pointer;
  color: var(--color-carbon);
}
.menu-toggle svg {
  width: 24px;
  height: 24px;
}

/* Mechanical Section Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3.5rem 1.25rem;
}

.section-head {
  margin-bottom: 2.5rem;
  position: relative;
}
.section-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-petrol);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}
.section-meta::after {
  content: "";
  flex: 1;
  max-width: 140px;
  height: 1px;
  background-color: var(--border-stone-solid);
}
.section-title {
  font-size: 2.15rem;
  font-weight: 900;
  color: var(--color-carbon-deep);
  line-height: 1.22;
  letter-spacing: -0.015em;
  margin-bottom: 0.85rem;
}
.section-desc {
  font-size: 1.05rem;
  color: var(--color-carbon-muted);
  max-width: 780px;
  line-height: 1.7;
}

/* HERO SECTION: Desktop Two Stacked Editorial Text Bands beside Large SVG */
.hero-section {
  padding: 2.5rem 1.25rem 4rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-text-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Stacked Editorial Band 1: Headline & Identity */
.editorial-band-1 {
  background-color: var(--color-stone-card);
  border: 2px solid var(--color-carbon);
  padding: 2.2rem 2.2rem 2rem;
  border-radius: var(--border-radius);
  box-shadow: 4px 4px 0 var(--color-carbon);
  position: relative;
}
.editorial-band-1::before {
  content: "[SYS-REV: 2026.10 // IEPL-CORE]";
  position: absolute;
  top: -0.75rem;
  left: 1.5rem;
  background-color: var(--color-carbon);
  color: var(--color-warm-stone);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.15rem 0.6rem;
  border-radius: 2px;
}

.hero-h1 {
  font-size: 2.6rem;
  font-weight: 900;
  line-height: 1.18;
  color: var(--color-carbon-deep);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}
.hero-h1 span.brand-accent {
  color: var(--color-copper);
  border-bottom: 3px solid var(--color-petrol);
  padding-bottom: 2px;
}

.hero-summary {
  font-size: 1.12rem;
  color: var(--color-carbon-soft);
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

/* Commercial CTAs in Hero */
.hero-cta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem;
  margin-top: 0.75rem;
}

.hero-disclaimer-note {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-carbon-muted);
  margin-top: 0.75rem;
  display: block;
}

/* Stacked Editorial Band 2: Mechanical Specs & Verification */
.editorial-band-2 {
  background: var(--color-carbon);
  color: var(--color-warm-stone);
  border: 2px solid var(--color-copper);
  padding: 1.5rem 2rem;
  border-radius: var(--border-radius);
  box-shadow: 4px 4px 0 var(--color-petrol);
}

.spec-grid-hero {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.spec-col {
  border-left: 2px solid rgba(167, 101, 67, 0.45);
  padding-left: 0.85rem;
}
.spec-col-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-copper-light);
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}
.spec-col-val {
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
}
.spec-col-desc {
  font-size: 0.75rem;
  color: #b0aaa0;
  margin-top: 0.25rem;
}

/* Hero Mechanism SVG Container */
.hero-mechanism-box {
  background: var(--color-stone-card);
  border: 2px solid var(--color-carbon);
  border-radius: var(--border-radius);
  padding: 1.25rem;
  box-shadow: 6px 6px 0 var(--color-copper);
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.mechanism-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background-color: var(--color-petrol);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.25rem 0.6rem;
  border-radius: 2px;
}
.hero-svg-wrapper {
  width: 100%;
  max-width: 440px;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* ==========================================================================
   OPTIONAL INTERACTIVE GEAR PUZZLE WORKSHOP
   ========================================================================== */
.puzzle-section {
  background-color: var(--color-carbon);
  color: var(--color-warm-stone);
  border-top: 3px solid var(--color-copper);
  border-bottom: 3px solid var(--color-petrol);
  padding: 4rem 1.25rem;
  position: relative;
}

.puzzle-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.puzzle-header {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 2.5rem;
}
.puzzle-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-copper-light);
  margin-bottom: 0.5rem;
  letter-spacing: 0.1em;
}
.puzzle-title {
  font-size: 2.1rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 0.75rem;
}
.puzzle-intro {
  font-size: 0.95rem;
  color: #b5afa4;
  line-height: 1.6;
}

.puzzle-card {
  background-color: var(--color-carbon-deep);
  border: 2px solid var(--color-copper);
  border-radius: var(--border-radius-lg);
  padding: 2.2rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

.gears-stage {
  display: flex;
  justify-content: space-around;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 2.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px dashed rgba(234, 229, 219, 0.2);
}

.gear-module {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.gear-canvas-wrap {
  width: 180px;
  height: 180px;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.gear-svg {
  width: 100%;
  height: 100%;
  transform-origin: center center;
  transition: transform 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.gear-alignment-target {
  position: absolute;
  top: -8px;
  width: 4px;
  height: 16px;
  background-color: #ff4757;
  border-radius: 2px;
  box-shadow: 0 0 8px #ff4757;
}

.gear-readout {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-warm-stone);
  text-align: center;
}
.gear-readout .gear-status-tag {
  display: block;
  font-size: 0.72rem;
  margin-top: 0.25rem;
}
.status-aligned {
  color: #2ed573;
  font-weight: 700;
}
.status-misaligned {
  color: #ffa502;
}

.gear-controls {
  display: flex;
  gap: 0.45rem;
}

.btn-gear {
  background-color: #333333;
  border: 1px solid var(--color-copper);
  color: #fff;
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.btn-gear:hover {
  background-color: var(--color-copper);
  color: #fff;
}
.btn-gear:active {
  transform: scale(0.96);
}

.puzzle-status-bar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background-color: #202020;
  border: 1px solid #3d3d3d;
  padding: 1.25rem 1.5rem;
  border-radius: var(--border-radius);
}

.status-bar-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.puzzle-progress-text {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-warm-stone);
}
.puzzle-progress-text span.val {
  color: var(--color-copper-light);
  font-size: 1.15rem;
}

.puzzle-reset-btn {
  background: none;
  border: 1px solid var(--border-stone-solid);
  color: #ccc;
  padding: 0.35rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  border-radius: 3px;
  cursor: pointer;
}
.puzzle-reset-btn:hover {
  border-color: var(--color-copper);
  color: var(--color-copper-light);
}

.puzzle-progress-track {
  width: 100%;
  height: 8px;
  background-color: #141414;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid #333;
}
.puzzle-progress-fill {
  height: 100%;
  width: 33.3%;
  background: linear-gradient(90deg, var(--color-petrol), var(--color-copper));
  transition: width 0.3s ease;
}

.puzzle-success-message {
  display: none;
  margin-top: 1rem;
  padding: 1rem;
  background-color: rgba(46, 213, 115, 0.15);
  border: 1px solid #2ed573;
  border-radius: var(--border-radius-sm);
  color: #7bed9f;
  font-size: 0.92rem;
  line-height: 1.5;
}
.puzzle-success-message.visible {
  display: block;
}

/* ==========================================================================
   ADVANTAGES SECTION: Exploded-View Annotations
   ========================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.advantage-card {
  background-color: var(--color-stone-card);
  border: 2px solid var(--color-carbon);
  border-radius: var(--border-radius);
  padding: 2rem 1.65rem;
  box-shadow: 4px 4px 0 var(--color-carbon);
  position: relative;
  display: flex;
  flex-direction: column;
}

.advantage-pin {
  position: absolute;
  top: -0.75rem;
  left: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  background-color: var(--color-petrol);
  color: #fff;
  border-radius: 2px;
}

.exploded-illustration {
  margin: 1rem 0 1.5rem;
  padding: 1.25rem 0.75rem;
  background-color: rgba(39, 39, 39, 0.04);
  border: 1px dashed var(--border-stone-solid);
  border-radius: 4px;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 140px;
}

.advantage-h3 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-carbon-deep);
  margin-bottom: 0.65rem;
  line-height: 1.3;
}

.advantage-text {
  font-size: 0.95rem;
  color: var(--color-carbon-muted);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.exploded-breakdown-list {
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  border-top: 1px solid var(--border-stone-solid);
  padding-top: 0.85rem;
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  color: var(--color-carbon-soft);
}
.exploded-breakdown-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.exploded-breakdown-list li span.val {
  color: var(--color-copper);
  font-weight: 600;
}

/* ==========================================================================
   NODE / NETWORK SECTION: Connection Schematic
   ========================================================================== */
.network-section {
  background-color: var(--color-stone-light);
  border-top: 2px solid var(--color-carbon);
  border-bottom: 2px solid var(--color-carbon);
  padding: 4.5rem 1.25rem;
}

.schematic-wrapper {
  background-color: var(--color-carbon);
  color: var(--color-warm-stone);
  border: 2px solid var(--color-copper);
  border-radius: var(--border-radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: 6px 6px 0 var(--color-petrol);
  margin-bottom: 2.5rem;
}

.schematic-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(234, 229, 219, 0.2);
  padding-bottom: 1.25rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.schematic-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
}
.schematic-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-copper-light);
}

.topology-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  position: relative;
}

.topology-step {
  background-color: #1f1f1f;
  border: 1px solid #3c3c3c;
  border-radius: var(--border-radius);
  padding: 1.35rem 1rem;
  position: relative;
  display: flex;
  flex-direction: column;
}
.topology-step::after {
  content: "→";
  position: absolute;
  right: -1.15rem;
  top: 45%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  color: var(--color-copper);
  font-weight: 900;
}
.topology-step:last-child::after {
  display: none;
}

.step-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-copper-light);
  margin-bottom: 0.35rem;
}
.step-name {
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.5rem;
}
.step-desc {
  font-size: 0.8rem;
  color: #b0aaa0;
  line-height: 1.45;
}

.network-nodes-table {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.node-box {
  background-color: var(--color-stone-card);
  border: 1px solid var(--border-stone-solid);
  border-left: 4px solid var(--color-petrol);
  padding: 1.25rem;
  border-radius: var(--border-radius-sm);
}
.node-box-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}
.node-title {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--color-carbon);
}
.node-latency {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-copper);
  font-weight: 700;
}
.node-desc {
  font-size: 0.85rem;
  color: var(--color-carbon-muted);
  line-height: 1.5;
}

/* ==========================================================================
   AI & STREAMING SECTION: Alternating Text Panels
   ========================================================================== */
.panels-stack {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.alt-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background-color: var(--color-stone-card);
  border: 2px solid var(--color-carbon);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 4px 4px 0 var(--color-carbon);
}

.alt-panel.reverse {
  direction: rtl;
}
.alt-panel.reverse .panel-text,
.alt-panel.reverse .panel-visual {
  direction: ltr;
}

.panel-text {
  padding: 2.5rem 2.2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.panel-sub {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-copper);
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.panel-h3 {
  font-size: 1.65rem;
  font-weight: 900;
  color: var(--color-carbon-deep);
  line-height: 1.25;
  margin-bottom: 1rem;
}

.panel-desc {
  font-size: 0.95rem;
  color: var(--color-carbon-muted);
  line-height: 1.68;
  margin-bottom: 1.25rem;
}

.app-tags-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1.25rem;
}
.app-tag {
  background-color: var(--color-warm-stone);
  border: 1px solid var(--border-stone-solid);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.25rem 0.55rem;
  border-radius: 3px;
  color: var(--color-carbon);
}

.panel-specs-inline {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-petrol);
  border-left: 2px solid var(--color-copper);
  padding-left: 0.75rem;
  line-height: 1.5;
}

.panel-visual {
  background-color: var(--color-carbon);
  color: var(--color-warm-stone);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  border-left: 2px solid var(--color-carbon);
}
.alt-panel.reverse .panel-visual {
  border-left: none;
  border-right: 2px solid var(--color-carbon);
}

/* ==========================================================================
   PRICING SECTION: Accessible Specification Table
   ========================================================================== */
.pricing-section {
  padding: 4.5rem 1.25rem;
}

.pricing-table-container {
  overflow-x: auto;
  background-color: var(--color-stone-card);
  border: 2px solid var(--color-carbon);
  border-radius: var(--border-radius-lg);
  box-shadow: 6px 6px 0 var(--color-carbon);
  margin-bottom: 2rem;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 760px;
}

.pricing-table th, 
.pricing-table td {
  padding: 1.15rem 1.25rem;
  border-bottom: 1px solid var(--border-stone-solid);
  font-size: 0.92rem;
}

.pricing-table thead th {
  background-color: var(--color-carbon);
  color: var(--color-warm-stone);
  font-weight: 800;
  font-size: 0.95rem;
  position: relative;
  border-bottom: 2px solid var(--color-copper);
}

.pricing-table thead th.col-highlight {
  background-color: var(--color-petrol-dark);
  color: #fff;
  border-top: 3px solid var(--color-copper);
}

.pricing-table thead th.col-highlight::before {
  content: "推荐 / 均衡选型";
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--color-copper-light);
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}

.pricing-table tbody tr:hover {
  background-color: rgba(167, 101, 67, 0.05);
}

.pricing-table td.col-highlight {
  background-color: rgba(39, 93, 104, 0.06);
  font-weight: 600;
}

.price-main {
  font-size: 1.45rem;
  font-weight: 900;
  color: var(--color-copper);
  display: inline-block;
  line-height: 1.15;
}

.price-val {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-carbon);
  display: inline-block;
  line-height: 1.15;
}

.price-unit {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-carbon-muted);
  font-weight: 600;
}

.price-status-pending {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-carbon-muted);
  background-color: rgba(0,0,0,0.06);
  padding: 0.2rem 0.45rem;
  border-radius: 2px;
}

.pricing-disclaimer-card {
  background-color: var(--color-stone-light);
  border: 1px solid var(--border-stone-solid);
  border-left: 4px solid var(--color-copper);
  padding: 1.25rem 1.5rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.85rem;
  color: var(--color-carbon-muted);
  line-height: 1.6;
}

/* ==========================================================================
   BLOG / ARTICLES SECTION: 9 Illustrated Cards (3x3 Desktop, 2x Tablet, 1x Mobile)
   ========================================================================== */
.articles-section {
  padding: 4.5rem 1.25rem;
  background-color: var(--color-stone-light);
  border-top: 2px solid var(--color-carbon);
}

.articles-grid-9 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.article-card-workshop {
  background-color: var(--color-warm-stone);
  border: 2px solid var(--color-carbon);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 4px 4px 0 var(--color-carbon);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.article-card-workshop:hover {
  transform: translateY(-3px);
  box-shadow: 6px 6px 0 var(--color-copper);
}

.article-card-visual {
  background-color: var(--color-carbon);
  border-bottom: 2px solid var(--color-carbon);
  padding: 1.25rem;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 130px;
}

.article-card-body {
  padding: 1.5rem 1.35rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.article-card-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-petrol);
  margin-bottom: 0.65rem;
}

.article-card-h3 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-carbon-deep);
  line-height: 1.35;
  margin-bottom: 0.75rem;
}
.article-card-h3 a:hover {
  color: var(--color-copper);
}

.article-card-excerpt {
  font-size: 0.88rem;
  color: var(--color-carbon-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex: 1;
}

.article-card-footer {
  border-top: 1px dashed var(--border-stone-solid);
  padding-top: 0.85rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.article-read-btn {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-copper-dark);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.article-read-btn:hover {
  color: var(--color-copper-light);
}

/* ==========================================================================
   TESTIMONIALS SECTION
   ========================================================================== */
.testimonials-section {
  padding: 4.5rem 1.25rem;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.testimonial-card {
  background-color: var(--color-stone-card);
  border: 1px solid var(--border-stone-solid);
  border-top: 4px solid var(--color-copper);
  border-radius: var(--border-radius);
  padding: 1.85rem 1.5rem;
  box-shadow: var(--shadow-workshop);
  display: flex;
  flex-direction: column;
}

.test-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--color-carbon-muted);
  background: rgba(0,0,0,0.05);
  display: inline-block;
  align-self: flex-start;
  padding: 0.15rem 0.45rem;
  margin-bottom: 0.85rem;
  border-radius: 2px;
}

.test-quote {
  font-size: 0.95rem;
  color: var(--color-carbon-soft);
  line-height: 1.65;
  margin-bottom: 1.25rem;
  flex: 1;
  font-style: italic;
}

.test-author-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-top: 1px solid var(--border-stone-solid);
  padding-top: 0.85rem;
}

.author-role {
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--color-carbon-deep);
}
.author-scenario {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-petrol);
}

/* ==========================================================================
   ACCORDION FAQ SECTION
   ========================================================================== */
.faq-section {
  padding: 4.5rem 1.25rem;
  background-color: var(--color-stone-light);
  border-top: 2px solid var(--color-carbon);
}

.faq-accordion-group {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background-color: var(--color-warm-stone);
  border: 2px solid var(--color-carbon);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  box-shadow: 3px 3px 0 var(--color-carbon);
}

.faq-toggle-btn {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 1.25rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-carbon-deep);
  gap: 1rem;
}
.faq-toggle-btn:hover {
  color: var(--color-copper);
}

.faq-icon-indicator {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-carbon);
  background-color: var(--color-stone-card);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.faq-item.active .faq-icon-indicator {
  transform: rotate(45deg);
  background-color: var(--color-copper);
  color: #fff;
  border-color: var(--color-copper-dark);
}

.faq-content-body {
  display: none;
  padding: 0 1.5rem 1.35rem;
  font-size: 0.95rem;
  color: var(--color-carbon-muted);
  line-height: 1.7;
  border-top: 1px dashed var(--border-stone-solid);
  margin-top: 0.25rem;
  padding-top: 1rem;
}

.faq-item.active .faq-content-body {
  display: block;
}

/* ==========================================================================
   FOOTER: Editorial Recommendations & Compliance
   ========================================================================== */
.site-footer {
  background-color: var(--color-carbon-deep);
  color: var(--color-warm-stone);
  border-top: 3px solid var(--color-copper);
  padding: 4rem 1.25rem 2.5rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(234, 229, 219, 0.15);
}

.footer-col-brand h3 {
  font-size: 1.35rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 0.85rem;
}
.footer-col-brand p {
  font-size: 0.88rem;
  color: #a8a299;
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.footer-nav-col h4 {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-copper-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.1rem;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}
.footer-links-list a {
  font-size: 0.88rem;
  color: #c9c3b8;
}
.footer-links-list a:hover {
  color: var(--color-copper-light);
  text-decoration: underline;
}

/* Required Editorial Recommendations Section */
.footer-editorial-box {
  background-color: #1e1e1e;
  border: 1px solid #383838;
  border-left: 3px solid var(--color-petrol-light);
  padding: 1.25rem;
  border-radius: var(--border-radius-sm);
  margin-top: 2rem;
  margin-bottom: 2rem;
}

.editorial-box-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-copper-light);
  margin-bottom: 0.65rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.editorial-links-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.editorial-link-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: #fff;
  font-weight: 600;
}
.editorial-link-item:hover {
  color: var(--color-copper-light);
}

.footer-bottom-bar {
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #888279;
}

/* ==========================================================================
   ARTICLE / SUBPAGE DETAIL TEMPLATE STYLES
   ========================================================================== */
.article-detail-wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 5rem;
}

.breadcrumb-nav {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-carbon-muted);
  margin-bottom: 1.5rem;
}
.breadcrumb-nav a {
  color: var(--color-petrol);
}
.breadcrumb-nav a:hover {
  text-decoration: underline;
}

.article-header-detail {
  border-bottom: 2px solid var(--color-carbon);
  padding-bottom: 2rem;
  margin-bottom: 2.5rem;
}

.article-h1 {
  font-size: 2.35rem;
  font-weight: 900;
  color: var(--color-carbon-deep);
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin-bottom: 1.25rem;
}

.article-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-carbon-muted);
}

.article-prose {
  font-size: 1.05rem;
  line-height: 1.82;
  color: var(--color-carbon-soft);
}

.article-prose h2 {
  font-size: 1.7rem;
  font-weight: 850;
  color: var(--color-carbon-deep);
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.45rem;
  border-bottom: 2px solid var(--border-stone-solid);
}

.article-prose h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-petrol-dark);
  margin: 1.75rem 0 0.75rem;
}

.article-prose p {
  margin-bottom: 1.35rem;
}

.article-prose ul, .article-prose ol {
  margin: 1.2rem 0 1.5rem 1.5rem;
  line-height: 1.75;
}

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

.workshop-callout {
  background-color: var(--color-stone-card);
  border: 1px solid var(--border-stone-solid);
  border-left: 4px solid var(--color-copper);
  border-radius: var(--border-radius-sm);
  padding: 1.25rem 1.5rem;
  margin: 1.85rem 0;
  box-shadow: var(--shadow-workshop-sm);
}

.workshop-callout-title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-copper-dark);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
}

.article-cta-box {
  background-color: var(--color-carbon);
  color: #fff;
  border: 2px solid var(--color-copper);
  border-radius: var(--border-radius);
  padding: 2.2rem 2rem;
  text-align: center;
  margin: 3.5rem 0 2.5rem;
  box-shadow: 6px 6px 0 var(--color-petrol);
}
.article-cta-box h3 {
  font-size: 1.5rem;
  font-weight: 900;
  margin-bottom: 0.75rem;
}
.article-cta-box p {
  font-size: 0.95rem;
  color: #c9c3b8;
  max-width: 600px;
  margin: 0 auto 1.5rem;
}

.related-articles-section {
  border-top: 2px solid var(--color-carbon);
  padding-top: 2.5rem;
  margin-top: 3.5rem;
}
.related-h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

/* ==========================================================================
   RESPONSIVE DESIGN BREAKPOINTS
   375px, 390px, 430px, 768px, 1024px, 1440px
   ========================================================================== */

/* Tablet (max 1024px) */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .hero-mechanism-box {
    order: 2;
  }
  .hero-text-container {
    order: 1;
  }
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid-9 {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
  .topology-flow {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 2rem;
  }
  .topology-step:nth-child(2)::after {
    display: none;
  }
}

/* Mobile & Small Tablet (max 768px) */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-warm-stone);
    border-bottom: 3px solid var(--color-carbon);
    padding: 1.5rem 1.25rem;
    box-shadow: 0 10px 20px rgba(0,0,0,0.15);
  }
  .main-nav.active {
    display: block;
  }
  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  .header-cta-group {
    display: none;
  }
  .nav-cta-mobile {
    display: block;
    width: 100%;
    margin-top: 1rem;
  }

  /* Mobile First Hero: Brand text & Commercial buttons FIRST */
  .hero-section {
    padding: 1.5rem 1rem 2.5rem;
  }
  .hero-h1 {
    font-size: 1.95rem;
  }
  .editorial-band-1 {
    padding: 1.5rem 1.25rem;
  }
  .editorial-band-2 {
    padding: 1.25rem 1rem;
  }
  .spec-grid-hero {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }

  .advantages-grid {
    grid-template-columns: 1fr;
  }
  .alt-panel {
    grid-template-columns: 1fr;
  }
  .alt-panel.reverse {
    direction: ltr;
  }
  .alt-panel.reverse .panel-visual {
    border-right: none;
    border-bottom: 2px solid var(--color-carbon);
  }
  .panel-visual {
    border-left: none;
    border-bottom: 2px solid var(--color-carbon);
    order: -1;
  }

  .articles-grid-9 {
    grid-template-columns: 1fr;
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .topology-flow {
    grid-template-columns: 1fr;
  }
  .topology-step::after {
    display: none;
  }
  .section-title {
    font-size: 1.65rem;
  }
  .gears-stage {
    gap: 1.5rem;
  }
}

/* Extra small devices (375px, 390px, 430px) */
@media (max-width: 430px) {
  .hero-h1 {
    font-size: 1.7rem;
  }
  .btn {
    width: 100%;
  }
  .hero-cta-bar {
    flex-direction: column;
    width: 100%;
  }
  .pricing-table th, 
  .pricing-table td {
    padding: 0.75rem 0.65rem;
    font-size: 0.82rem;
  }
  .editorial-links-row {
    flex-direction: column;
    gap: 0.75rem;
  }
}

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