/* ==========================================================================
   YEAGOOD TECH (杭州冶谷科技有限公司) - Master Stylesheet
   Web-First Architecture, Design Tokens, Interactive Components, Responsive
   ========================================================================== */

/* --- 1. CSS Design Tokens & Themes --- */
:root {
  /* Brand Palette */
  --brand-primary: #1c87e3;
  --brand-primary-rgb: 28, 135, 227;
  --brand-primary-light: #38bdf8;
  --brand-primary-dark: #0284c7;
  --brand-accent: #f59e0b;
  --brand-accent-rgb: 245, 158, 11;
  --brand-cyan: #06b6d4;
  --brand-emerald: #10b981;
  --brand-rose: #f43f5e;

  /* Dark Theme (Default) */
  --bg-base: #090d16;
  --bg-surface: #0f172a;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.9);
  --bg-alt: #0c1220;
  --bg-badge: rgba(28, 135, 227, 0.12);
  --bg-accent-badge: rgba(245, 158, 11, 0.12);
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-glow: rgba(28, 135, 227, 0.35);
  --border-color-accent: rgba(245, 158, 11, 0.35);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --text-inverse: #0f172a;

  --nav-bg: rgba(9, 13, 22, 0.85);
  --glass-blur: 16px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 35px rgba(28, 135, 227, 0.25);
  --shadow-glow-accent: 0 0 35px rgba(245, 158, 11, 0.2);

  /* Gradients */
  --grad-primary: linear-gradient(135deg, #1c87e3 0%, #38bdf8 100%);
  --grad-accent: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
  --grad-text: linear-gradient(135deg, #ffffff 30%, #94a3b8 100%);
  --grad-text-glow: linear-gradient(135deg, #38bdf8 0%, #1c87e3 50%, #f59e0b 100%);
  --grad-hero-bg: radial-gradient(circle at 50% -20%, rgba(28, 135, 227, 0.18) 0%, rgba(9, 13, 22, 0) 70%);

  /* Layout */
  --max-width: 1240px;
  --header-height: 76px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-base: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: #ffffff;
  --bg-alt: #f1f5f9;
  --bg-badge: rgba(28, 135, 227, 0.08);
  --bg-accent-badge: rgba(245, 158, 11, 0.08);

  --border-color: rgba(15, 23, 42, 0.08);
  --border-color-glow: rgba(28, 135, 227, 0.3);
  --border-color-accent: rgba(245, 158, 11, 0.35);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #64748b;
  --text-inverse: #f8fafc;

  --nav-bg: rgba(248, 250, 252, 0.88);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 12px 32px rgba(15, 23, 42, 0.08);
  --shadow-glow: 0 0 35px rgba(28, 135, 227, 0.15);

  --grad-text: linear-gradient(135deg, #0f172a 30%, #334155 100%);
  --grad-hero-bg: radial-gradient(circle at 50% -20%, rgba(28, 135, 227, 0.12) 0%, rgba(248, 250, 252, 0) 70%);
}

/* --- 2. CSS Reset & Typography --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
  color-scheme: dark light;
}

body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  background-image: var(--grad-hero-bg);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  color: inherit;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- 3. Global Navigation (Header) --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--nav-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo-img {
  height: 48px;
  width: auto;
  object-fit: contain;
  transition: transform var(--transition-fast);
}

.brand-logo:hover .brand-logo-img {
  transform: scale(1.02);
}

.logo-dark { display: block; }
.logo-light { display: none; }
[data-theme="light"] .logo-dark { display: none; }
[data-theme="light"] .logo-light { display: block; }

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 24px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--brand-primary);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--grad-primary);
  transition: width var(--transition-normal);
  border-radius: 2px;
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--brand-primary);
  border-color: var(--border-color-glow);
  background: var(--bg-card-hover);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition-normal);
  text-align: center;
}

.btn-primary {
  background: var(--grad-primary);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(28, 135, 227, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(28, 135, 227, 0.5);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color-glow);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.88rem;
}

.mobile-menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  align-items: center;
  justify-content: center;
}

/* --- 4. Hero Section & Tech Sandbox --- */
.hero-section {
  padding-top: calc(var(--header-height) + 50px);
  padding-bottom: 80px;
  position: relative;
  overflow: hidden;
}

.hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto 50px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  background: var(--bg-badge);
  border: 1px solid var(--border-color-glow);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--brand-primary-light);
  margin-bottom: 24px;
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--brand-primary);
  box-shadow: 0 0 10px var(--brand-primary);
  animation: pulse-glow 2s infinite;
}

.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.2;
  margin-bottom: 24px;
}

.hero-title .highlight {
  background: var(--grad-text-glow);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
}

.hero-subtitle strong {
  color: var(--text-primary);
  font-weight: 600;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}

/* Dynamic Architecture Topology Sandbox */
.arch-sandbox {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md);
  margin-bottom: 60px;
  position: relative;
  overflow: hidden;
}

.arch-sandbox-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.arch-sandbox-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.arch-status-pill {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.15);
  color: var(--brand-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
  font-weight: 600;
}

.arch-flow-grid {
  display: grid;
  grid-template-columns: 1fr 40px 1.4fr 40px 1fr;
  align-items: center;
  gap: 12px;
}

.arch-node {
  background: var(--bg-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 16px;
  text-align: left;
  transition: all var(--transition-fast);
}

.arch-node:hover {
  border-color: var(--border-color-glow);
  transform: translateY(-2px);
}

.arch-node-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--brand-primary-light);
  margin-bottom: 8px;
}

.arch-node-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.arch-node-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.arch-connector {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-primary-light);
  font-size: 1.2rem;
  animation: pulse-glow 2s infinite;
}

/* Key Metrics Ticker */
.metrics-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 18px;
  text-align: center;
  transition: all var(--transition-normal);
  backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
}

.metric-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--grad-primary);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.metric-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-color-glow);
  box-shadow: var(--shadow-glow);
}

.metric-card:hover::before {
  opacity: 1;
}

.metric-number {
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: 8px;
  font-feature-settings: "tnum";
}

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

.metric-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* --- 5. Common Section Framework --- */
.section {
  padding: 100px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-alt);
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 54px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--brand-primary);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- 6. Pain Points Section --- */
.pain-points-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pain-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.pain-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-color-glow);
}

.pain-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(244, 63, 94, 0.12);
  border: 1px solid rgba(244, 63, 94, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-rose);
  margin-bottom: 20px;
}

.pain-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.35;
}

.pain-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.pain-remedy {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-badge);
  border: 1px solid var(--border-color-glow);
  font-size: 0.85rem;
  color: var(--brand-primary-light);
}

.pain-remedy strong {
  color: var(--text-primary);
}

/* --- 7. Interactive Solution Hub (Tabbed) --- */
.solution-tabs-nav {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 12px 24px;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.tab-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-color-glow);
}

.tab-btn.active {
  background: var(--grad-primary);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 20px rgba(28, 135, 227, 0.4);
}

.solution-tab-pane {
  display: none;
}

.solution-tab-pane.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.solution-display-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 44px 40px;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
}

.solution-meta h3 {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 14px;
  line-height: 1.3;
}

.solution-tagline {
  font-size: 1.05rem;
  color: var(--brand-primary-light);
  margin-bottom: 20px;
  font-weight: 500;
}

.solution-paragraph {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
}

.solution-deliverables {
  list-style: none;
  margin-bottom: 30px;
}

.solution-deliverables li {
  position: relative;
  padding-left: 26px;
  font-size: 0.92rem;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.55;
}

.solution-deliverables li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--brand-emerald);
  font-weight: 800;
}

.solution-stack-box {
  background: var(--bg-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.stack-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.stack-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.stack-tag {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color-glow);
  font-size: 0.8rem;
  color: var(--brand-primary-light);
  font-weight: 600;
}

.solution-case-snippet {
  padding: 18px;
  border-radius: var(--radius-sm);
  background: var(--bg-badge);
  border-left: 3px solid var(--brand-primary);
}

.snippet-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--brand-accent);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.snippet-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* --- 8. The Firm Model: Value to Client --- */
.firm-values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 60px;
}

.firm-value-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  position: relative;
  transition: all var(--transition-normal);
}

.firm-value-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-color-glow);
  box-shadow: var(--shadow-glow);
}

.value-stat {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--brand-accent);
  margin-bottom: 8px;
  line-height: 1;
}

.value-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.value-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Comparison Table */
.matrix-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md);
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.matrix-table th, .matrix-table td {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}

.matrix-table th {
  background-color: rgba(15, 23, 42, 0.4);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.matrix-table th.col-brand {
  background: linear-gradient(180deg, rgba(28, 135, 227, 0.2) 0%, rgba(15, 23, 42, 0.6) 100%);
  color: var(--brand-primary-light);
  border-left: 2px solid var(--brand-primary);
  border-right: 2px solid var(--brand-primary);
}

.matrix-table td.col-brand {
  background: rgba(28, 135, 227, 0.04);
  border-left: 2px solid var(--brand-primary);
  border-right: 2px solid var(--brand-primary);
  font-weight: 600;
  color: var(--text-primary);
}

.matrix-dim-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.matrix-dim-sub {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-top: 4px;
}

.col-traditional {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

.status-bad {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--brand-rose);
  font-weight: 600;
  margin-bottom: 4px;
}

.status-good {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--brand-emerald);
  font-weight: 700;
  margin-bottom: 4px;
}

/* --- 9. Engineering Battles: Deep-dive Cases --- */
.battles-grid {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.battle-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md);
  display: grid;
  grid-template-columns: 360px 1fr;
  transition: border-color var(--transition-normal);
}

.battle-card:hover {
  border-color: var(--border-color-glow);
}

.battle-media-pane {
  position: relative;
  background-color: var(--bg-alt);
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border-color);
}

.battle-media-cover {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: #060a12;
  border-bottom: 1px solid var(--border-color);
}

.battle-media-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.battle-card:hover .battle-media-cover img {
  transform: scale(1.05);
}

.battle-media-stats {
  padding: 24px 22px;
  background: var(--bg-surface);
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  gap: 14px;
  flex-grow: 1;
}

.battle-stat-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.battle-stat-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.battle-stat-label {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  font-weight: 500;
}

.battle-stat-value {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--brand-accent);
  letter-spacing: 0.3px;
}

.battle-detail-pane {
  padding: 36px 36px 32px;
  display: flex;
  flex-direction: column;
}

.battle-header-tag {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--brand-primary-light);
  margin-bottom: 8px;
}

.battle-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 20px;
  line-height: 1.3;
}

.battle-narrative-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 24px;
  flex-grow: 1;
}

.narrative-col {
  background: var(--bg-alt);
  padding: 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.narrative-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.narrative-title.problem { color: var(--brand-rose); }
.narrative-title.solution { color: var(--brand-primary-light); }
.narrative-title.impact { color: var(--brand-emerald); }

.narrative-body {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.battle-quote {
  font-size: 0.88rem;
  color: var(--text-primary);
  font-style: italic;
  padding: 10px 14px;
  background: var(--bg-badge);
  border-left: 3px solid var(--brand-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* --- 10. The Partners (Core Team) --- */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.partner-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.partner-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-color-glow);
  box-shadow: var(--shadow-glow);
}

.partner-avatar {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  background: var(--bg-badge);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-primary-light);
  margin-bottom: 20px;
  border: 1px solid var(--border-color-glow);
  box-shadow: 0 4px 16px rgba(28, 135, 227, 0.15);
  transition: all var(--transition-fast);
}

.partner-card:hover .partner-avatar {
  background: var(--grad-primary);
  color: #ffffff;
  border-color: transparent;
  transform: scale(1.05);
}

.partner-name {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.partner-role {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--brand-accent);
  margin-bottom: 12px;
  white-space: nowrap;
}

.partner-badge {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--brand-primary-light);
  background: var(--bg-badge);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  display: inline-block;
  margin-bottom: 16px;
  border: 1px solid var(--border-color-glow);
}

.partner-bio {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.65;
  flex-grow: 1;
}

/* --- 11. Executive FAQ Section --- */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--border-color-glow);
}

.faq-summary {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-icon {
  transition: transform 0.3s ease;
  color: var(--brand-primary);
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 22px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

/* --- 13. Contact & Direct Connection --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
}

.consultation-form-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-label .required {
  color: var(--brand-rose);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(28, 135, 227, 0.2);
}

.direct-contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(16px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.direct-contact-header h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.direct-contact-header p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 28px;
}

.contact-channels {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.channel-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--bg-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.channel-item:hover {
  border-color: var(--border-color-glow);
}

.channel-info {
  display: flex;
  align-items: center;
  gap: 14px;
}

.channel-icon {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--bg-badge);
  border: 1px solid var(--border-color-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-primary-light);
}

.channel-lbl {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.channel-val {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.channel-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
  text-decoration: none;
  flex-shrink: 0;
}

.copy-btn:hover {
  background: var(--brand-primary);
  color: #ffffff;
  border-color: var(--brand-primary);
  transform: translateY(-1px);
}

.consult-tip-box {
  margin-top: 24px;
  padding: 16px;
  border-radius: var(--radius-md);
  background: var(--bg-accent-badge);
  border: 1px solid var(--border-color-accent);
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.consult-tip-box strong {
  color: var(--brand-accent);
}

/* --- 14. Footer --- */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 28px 0;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-tertiary);
  flex-wrap: wrap;
  gap: 12px;
}

/* --- 15. Toast Feedback --- */
.toast-notice {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color-glow);
  padding: 14px 22px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 2000;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  color: var(--text-primary);
  font-size: 0.9rem;
}

.toast-notice.show {
  transform: translateY(0);
  opacity: 1;
}

/* --- 16. Responsive Media Queries --- */
@media (max-width: 1080px) {
  .arch-flow-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .arch-connector {
    transform: rotate(90deg);
  }
  .pain-points-grid {
    grid-template-columns: 1fr;
  }
  .solution-display-card {
    grid-template-columns: 1fr;
  }
  .firm-values-grid {
    grid-template-columns: 1fr;
  }
  .battle-card {
    grid-template-columns: 1fr;
  }
  .battle-media-pane {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
  .battle-media-cover {
    aspect-ratio: 16 / 9;
  }
  .battle-narrative-grid {
    grid-template-columns: 1fr;
  }
  .partners-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    padding: 24px;
    flex-direction: column;
    gap: 18px;
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    transform: translateY(0);
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .brand-logo-img {
    height: 42px;
  }

  .header-actions .btn-primary {
    display: none;
  }

  .metrics-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .partners-grid {
    grid-template-columns: 1fr;
  }

  .matrix-container {
    overflow-x: auto;
  }

  .matrix-table {
    min-width: 600px;
  }
}