/* ==========================================================================
   疾风云 (JIFENGYUN) - THEME 05: KINETIC SIGNAL TYPOGRAPHY
   Core Stylesheet
   ========================================================================== */

:root {
  /* Color System */
  --bg-main: #FFFFFF;
  --bg-subtle-1: #F7F7F4;
  --bg-subtle-2: #F1F2EE;
  --bg-subtle-3: #FAFAF8;
  --bg-offwhite: #F6F6F2;
  
  --color-black: #111111;
  --color-body: #3F4341;
  --color-secondary: #777C78;
  --color-border: #E6E8E4;
  --color-border-dark: #222222;
  
  /* Signal Accent */
  --signal-lime: #B8F23A;
  --signal-lime-hover: #A5DE2A;
  --signal-blue: #2D6BFF;
  
  /* Typography Stacks */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  
  /* Metrics */
  --header-height: 64px;
  --container-max: 1440px;
  --container-article: 800px;
  --letter-spacing-tight: -0.04em;
  --letter-spacing-mono: 0.05em;
  
  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  background-color: var(--bg-main);
  color: var(--color-body);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Base Headings & Links */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-black);
  font-weight: 800;
  letter-spacing: var(--letter-spacing-tight);
  line-height: 1.1;
}

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

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--color-black);
  outline-offset: 2px;
}

ul, ol {
  list-style: none;
}

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

/* Monospace Utilities */
.mono {
  font-family: var(--font-mono);
  letter-spacing: var(--letter-spacing-mono);
  text-transform: uppercase;
}

/* Screen Reader Only (For accessible H1 / headings when visual typography handles display) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ==========================================================================
   Signal Buttons & CTAs
   ========================================================================== */
.signal-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--signal-lime);
  color: var(--color-black);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.02em;
  padding: 0.85rem 1.75rem;
  border: 1px solid var(--color-black);
  border-radius: 0;
  cursor: pointer;
  transition: transform var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}

.signal-cta-btn:hover {
  background-color: var(--color-black);
  color: var(--signal-lime);
  transform: translateY(-1px);
}

.signal-cta-btn-lg {
  padding: 1.25rem 2.75rem;
  font-size: 1.25rem;
}

.signal-text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-black);
  font-weight: 600;
  border-bottom: 2px solid var(--color-black);
  padding-bottom: 2px;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.signal-text-link:hover {
  color: var(--color-black);
  border-bottom-color: var(--signal-lime);
}

/* ==========================================================================
   Header: SIGNAL STRIP HEADER (56-68px)
   ========================================================================== */
.signal-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  transition: background-color var(--transition-fast);
}

.header-container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 2rem;
}

.brand-badge {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-weight: 900;
  font-size: 1.35rem;
  letter-spacing: -0.05em;
  color: var(--color-black);
}

.brand-badge .brand-sub {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-secondary);
}

/* Center Thin Ticker in Header */
.header-ticker-wrap {
  overflow: hidden;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-secondary);
  position: relative;
  display: flex;
  align-items: center;
}

.header-ticker-track {
  display: inline-block;
  white-space: nowrap;
  animation: ticker-slide 30s linear infinite;
}

.header-ticker-track span {
  display: inline-block;
  padding: 0 1.5rem;
}

.header-ticker-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  background-color: var(--signal-lime);
  border-radius: 50%;
  margin-right: 0.5rem;
  vertical-align: middle;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.btn-menu-index {
  background: transparent;
  border: 1px solid var(--color-black);
  padding: 0.55rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  color: var(--color-black);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.btn-menu-index:hover {
  background-color: var(--color-black);
  color: var(--signal-lime);
}

.header-cta-link {
  font-size: 0.9rem;
  padding: 0.55rem 1.25rem;
}

/* ==========================================================================
   Full Screen Typographic Menu
   ========================================================================== */
.full-screen-menu {
  position: fixed;
  inset: 0;
  background-color: var(--color-black);
  color: #FFFFFF;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 2.5rem;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-15px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
  overflow-y: auto;
}

.full-screen-menu.is-active {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.menu-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--color-border-dark);
  padding-bottom: 1.5rem;
}

.menu-top-brand {
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: #FFFFFF;
}

.menu-top-brand span {
  color: var(--signal-lime);
}

.btn-menu-close {
  background: none;
  border: 1px solid #444;
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.5rem 1.25rem;
  cursor: pointer;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.btn-menu-close:hover {
  border-color: var(--signal-lime);
  color: var(--signal-lime);
}

.menu-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin: 3rem 0;
}

.menu-item-link {
  display: block;
  padding: 1.5rem 1rem;
  border-top: 1px solid var(--color-border-dark);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.menu-item-link:hover {
  border-top-color: var(--signal-lime);
  background-color: rgba(184, 242, 58, 0.05);
}

.menu-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--signal-lime);
  line-height: 1;
  margin-bottom: 0.75rem;
}

.menu-title {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: -0.02em;
}

.menu-bottom-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--color-border-dark);
  padding-top: 1.5rem;
}

.menu-bottom-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-secondary);
}

/* ==========================================================================
   Hero: KINETIC TWO-COLUMN POSTER HERO (620px-720px)
   ========================================================================== */
.hero-poster-section {
  position: relative;
  background-color: var(--bg-main);
  padding: 72px 1.5rem 80px;
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

.hero-poster-container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 3.5rem;
  align-items: start;
}

/* Hero Left Column (approx 60%) */
.hero-col-left {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.hero-eyebrow-line {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-secondary);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.65rem;
}

.hero-signal-tag {
  color: var(--color-black);
  background-color: var(--signal-lime);
  padding: 0.15rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 800;
}

.hero-brand-line {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: -0.25rem;
}

.hero-brand-title {
  font-size: clamp(3rem, 5.5vw, 5rem);
  font-weight: 900;
  letter-spacing: -0.05em;
  color: var(--color-black);
  line-height: 1;
}

.hero-brand-sub {
  font-family: var(--font-mono);
  font-size: clamp(0.85rem, 1.3vw, 1.25rem);
  font-weight: 700;
  color: var(--color-secondary);
  letter-spacing: 0.08em;
}

.hero-h1-main {
  font-size: clamp(1.5rem, 2.6vw, 2.35rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--color-black);
  line-height: 1.2;
}

.hero-slogan-kinetic {
  font-size: clamp(1.25rem, 2vw, 1.85rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-body);
}

.hero-slogan-accent {
  color: var(--color-black);
  position: relative;
  display: inline-block;
  margin-left: 0.4rem;
}

.hero-slogan-accent::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 0;
  width: 100%;
  height: 4px;
  background-color: var(--signal-lime);
  z-index: -1;
}

.hero-desc-text {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--color-body);
  max-width: 620px;
}

.hero-quick-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.hero-tag-item {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  background-color: var(--bg-subtle-1);
  border: 1px solid var(--color-border);
  padding: 0.35rem 0.75rem;
  color: var(--color-black);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.hero-tag-item:hover {
  border-color: var(--color-black);
  background-color: var(--signal-lime);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

/* Hero Right Column (approx 42%): Text Information Specs Only */
.hero-col-right {
  display: flex;
  flex-direction: column;
}

.hero-info-specs-card {
  background-color: var(--bg-subtle-1);
  border: 1px solid var(--color-border);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hero-info-specs-card .spec-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px dashed var(--color-border);
  padding-bottom: 6px;
}

.hero-info-specs-card .spec-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-secondary);
}

.hero-info-specs-card .spec-val {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-black);
}

/* ==========================================================================
   Moving Information Ticker
   ========================================================================== */
.signal-ticker-band {
  background-color: var(--color-black);
  color: #FFFFFF;
  padding: 0.9rem 0;
  overflow: hidden;
  white-space: nowrap;
  border-top: 1px solid var(--color-black);
  border-bottom: 1px solid var(--color-black);
}

.ticker-track {
  display: inline-flex;
  white-space: nowrap;
  animation: ticker-slide 35s linear infinite;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.ticker-track span {
  display: inline-flex;
  align-items: center;
  padding: 0 1.5rem;
}

.ticker-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  background-color: var(--signal-lime);
  border-radius: 50%;
  margin-right: 0.85rem;
}

@keyframes ticker-slide {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ==========================================================================
   Section Universal Wrappers
   ========================================================================== */
.section-wrap {
  padding: 6rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--bg-main);
}

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

.section-label-bar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 2px solid var(--color-black);
  padding-bottom: 0.75rem;
  margin-bottom: 3.5rem;
}

.section-num-label {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-black);
  letter-spacing: 0.05em;
}

.section-num-accent {
  color: var(--signal-lime);
  background-color: var(--color-black);
  padding: 0.15rem 0.5rem;
  margin-right: 0.5rem;
}

.section-title-sub {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-secondary);
  font-weight: 600;
}

/* ==========================================================================
   Section 01: WHAT YOU GET (Full Width Typography Split)
   ========================================================================== */
.what-you-get-list {
  display: flex;
  flex-direction: column;
}

.what-split-row {
  display: grid;
  grid-template-columns: 380px 1fr;
  align-items: baseline;
  padding: 2.25rem 0;
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-fast), padding-left var(--transition-fast);
}

.what-split-row:hover {
  background-color: var(--bg-subtle-1);
  padding-left: 1rem;
}

.what-key-word {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 900;
  color: var(--color-black);
  letter-spacing: -0.04em;
  line-height: 1;
}

.what-desc-content {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.what-desc-main {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-black);
  letter-spacing: -0.02em;
}

.what-desc-detail {
  font-size: 1rem;
  color: var(--color-secondary);
  line-height: 1.5;
}

/* ==========================================================================
   Section 02: GLOBAL REGIONS (Horizontal Type Bands)
   ========================================================================== */
.regions-band-list {
  display: flex;
  flex-direction: column;
}

.region-band-item {
  border-bottom: 1px solid var(--color-border);
  padding: 2.5rem 0;
  transition: background-color var(--transition-fast);
}

.region-band-item:hover {
  background-color: var(--bg-subtle-1);
}

.region-band-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1rem;
}

.region-huge-name {
  font-size: clamp(3.2rem, 7vw, 6.5rem);
  font-weight: 900;
  letter-spacing: -0.05em;
  color: var(--color-black);
  line-height: 0.95;
}

.region-band-num {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4.5vw, 4rem);
  font-weight: 800;
  color: var(--color-black);
}

.region-band-num span {
  color: var(--signal-lime);
  background-color: var(--color-black);
  padding: 0 0.4rem;
}

.region-nodes-sublist {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.5rem;
  padding-top: 0.75rem;
}

.region-node-pill {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-body);
}

.region-node-pill::before {
  content: "→";
  color: var(--signal-lime);
  background-color: var(--color-black);
  width: 1.2rem;
  height: 1.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
}

/* ==========================================================================
   Section 03: EVERY SCREEN (Device Type Index)
   ========================================================================== */
.device-index-list {
  display: flex;
  flex-direction: column;
}

.device-row-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 2rem;
  padding: 2.25rem 0;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  color: var(--color-black);
  transition: transform var(--transition-fast);
}

.device-row-item::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--signal-lime);
  transition: width var(--transition-normal);
}

.device-row-item:hover::after {
  width: 100%;
}

.device-row-item:hover .device-arrow {
  transform: translateX(6px);
  color: var(--signal-lime);
  background-color: var(--color-black);
}

.device-big-name {
  font-size: clamp(2.5rem, 5.5vw, 4.5rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
}

.device-desc-pill {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--color-secondary);
}

.device-row-num {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-black);
}

.device-arrow {
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--color-black);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  transition: transform var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}

/* ==========================================================================
   Section 04: USE CASES (Typographic Cross Grid)
   ========================================================================== */
.usecases-cross-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
}

.usecase-panel {
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 3.5rem 3rem;
  background-color: var(--bg-main);
  transition: background-color var(--transition-fast);
}

.usecase-panel:hover {
  background-color: var(--bg-subtle-1);
}

.usecase-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 2px solid var(--color-black);
  padding-bottom: 1rem;
  margin-bottom: 2.5rem;
}

.usecase-title {
  font-size: 2.25rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--color-black);
}

.usecase-count {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--signal-lime);
  background-color: var(--color-black);
  padding: 0.15rem 0.6rem;
}

.usecase-items-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.usecase-item-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px dashed var(--color-border);
  padding-bottom: 0.75rem;
}

.usecase-item-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-black);
  letter-spacing: -0.02em;
}

.usecase-item-desc {
  font-size: 0.95rem;
  color: var(--color-secondary);
}

/* ==========================================================================
   Section 05: CHOOSE YOUR FLOW (Giant Typographic Pricing)
   ========================================================================== */
.pricing-giant-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
}

.pricing-giant-block {
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 4rem 3.5rem;
  background-color: var(--bg-main);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: background-color var(--transition-fast);
}

.pricing-giant-block:hover {
  background-color: var(--bg-subtle-1);
}

.pricing-giant-block.is-recommended {
  background-color: var(--bg-subtle-2);
}

.pricing-top-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 2rem;
}

.pricing-index-num {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-secondary);
}

.pricing-plan-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  background-color: var(--color-black);
  color: var(--signal-lime);
  padding: 0.25rem 0.6rem;
  letter-spacing: 0.05em;
}

.pricing-plan-title {
  font-size: 2.75rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--color-black);
  margin-bottom: 1.5rem;
}

.pricing-gb-display {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  line-height: 0.9;
  margin-bottom: 2rem;
}

.pricing-gb-num {
  font-size: clamp(4.5rem, 8vw, 7.5rem);
  font-weight: 900;
  letter-spacing: -0.05em;
  color: var(--color-black);
}

.pricing-gb-unit {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-secondary);
}

.pricing-price-line {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  margin-bottom: 2.5rem;
}

.pricing-currency {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-black);
}

.pricing-amount {
  font-size: 3.25rem;
  font-weight: 900;
  color: var(--color-black);
  letter-spacing: -0.03em;
}

.pricing-cycle {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--color-secondary);
  font-weight: 600;
}

.pricing-features-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 3rem;
  font-size: 0.95rem;
  color: var(--color-body);
}

.pricing-features-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pricing-features-list li::before {
  content: "■";
  color: var(--signal-lime);
  font-size: 0.65rem;
}

/* ==========================================================================
   Section 06: READ (Newspaper Typographic Index)
   ========================================================================== */
.newspaper-blog-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3.5rem;
}

.newspaper-sidebar-brand {
  position: sticky;
  top: calc(var(--header-height) + 2rem);
}

.newspaper-giant-heading {
  font-size: clamp(4rem, 8vw, 7rem);
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: var(--color-black);
  margin-bottom: 0.5rem;
}

.newspaper-count-badge {
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--signal-lime);
  background-color: var(--color-black);
  padding: 0.15rem 0.75rem;
  display: inline-block;
  margin-bottom: 1.5rem;
}

.newspaper-sidebar-desc {
  font-size: 0.95rem;
  color: var(--color-secondary);
  line-height: 1.6;
}

.newspaper-articles-list {
  display: flex;
  flex-direction: column;
}

.newspaper-article-row {
  display: block;
  padding: 2.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
  transition: transform var(--transition-fast), background-color var(--transition-fast), padding-left var(--transition-fast);
  text-decoration: none;
}

.newspaper-article-row:hover {
  background-color: rgba(184, 242, 58, 0.08);
  padding-left: 2rem;
}

.newspaper-article-row:hover .article-row-arrow {
  color: var(--signal-lime);
  background-color: var(--color-black);
  transform: rotate(45deg);
}

.article-row-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.75rem;
}

.article-row-num {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-secondary);
}

.article-row-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-secondary);
}

.article-category-tag {
  background-color: var(--color-border);
  color: var(--color-black);
  padding: 0.15rem 0.5rem;
  font-weight: 600;
}

.article-row-title {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-black);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.article-row-bottom {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 2rem;
}

.article-row-summary {
  font-size: 0.95rem;
  color: var(--color-secondary);
  max-width: 680px;
  line-height: 1.5;
}

.article-row-arrow {
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--color-black);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  transition: transform var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
  flex-shrink: 0;
}

/* ==========================================================================
   Section 07: QUESTIONS (Huge FAQ List)
   ========================================================================== */
.faq-huge-list {
  display: flex;
  flex-direction: column;
}

.faq-item-row {
  border-bottom: 1px solid var(--color-border);
}

.faq-question-btn {
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  padding: 2.25rem 0;
  cursor: pointer;
  display: grid;
  grid-template-columns: 80px 1fr auto;
  align-items: center;
  gap: 1.5rem;
  transition: color var(--transition-fast);
}

.faq-item-num {
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 900;
  color: var(--color-secondary);
  transition: color var(--transition-fast);
}

.faq-question-text {
  font-size: clamp(1.35rem, 2.75vw, 2.15rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-black);
}

.faq-toggle-icon {
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--color-black);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  transition: transform var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}

.faq-item-row.is-open .faq-item-num {
  color: var(--color-black);
  background-color: var(--signal-lime);
  padding: 0 0.5rem;
  display: inline-block;
  width: fit-content;
}

.faq-item-row.is-open .faq-toggle-icon {
  background-color: var(--color-black);
  color: var(--signal-lime);
  transform: rotate(45deg);
}

.faq-answer-panel {
  display: none;
  padding: 0 0 2.5rem 80px;
  max-width: 900px;
}

.faq-item-row.is-open .faq-answer-panel {
  display: block;
}

.faq-answer-text {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--color-body);
}

/* ==========================================================================
   Footer: BLACK TYPOGRAPHIC FOOTER
   ========================================================================== */
.footer-black-typography {
  background-color: var(--color-black);
  color: #FFFFFF;
  padding: 6rem 1.5rem 3rem;
  border-top: 1px solid var(--color-black);
}

.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 4rem;
}

.footer-giant-brand-row {
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--color-border-dark);
  padding-bottom: 2.5rem;
}

.footer-giant-logo {
  font-size: clamp(4.5rem, 14vw, 13rem);
  font-weight: 900;
  letter-spacing: -0.06em;
  color: #FFFFFF;
  line-height: 0.9;
  margin-bottom: 0.5rem;
}

.footer-sub-line {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-secondary);
  letter-spacing: 0.1em;
}

.footer-sub-line span {
  color: var(--signal-lime);
}

/* Footer Giant Links */
.footer-giant-nav {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-bottom: 1px solid var(--color-border-dark);
  padding-bottom: 3.5rem;
}

.footer-nav-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1rem;
  font-size: 1.35rem;
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: -0.02em;
  border-right: 1px solid var(--color-border-dark);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.footer-nav-link:last-child {
  border-right: none;
}

.footer-nav-link:hover {
  color: var(--signal-lime);
  background-color: rgba(184, 242, 58, 0.05);
}

/* Footer Secondary & External Links */
.footer-secondary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 3rem;
  align-items: center;
  border-bottom: 1px solid var(--color-border-dark);
  padding-bottom: 2.5rem;
}

.footer-legal-links {
  display: flex;
  gap: 2rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-secondary);
}

.footer-legal-links a:hover {
  color: var(--signal-lime);
}

.footer-recommend-sites {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--color-secondary);
}

.footer-recommend-sites a {
  color: #BBB;
  border-bottom: 1px solid #444;
  padding-bottom: 2px;
}

.footer-recommend-sites a:hover {
  color: var(--signal-lime);
  border-bottom-color: var(--signal-lime);
}

.footer-bottom-copy {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-secondary);
}

/* ==========================================================================
   Article & Editorial Signal Document Layout
   ========================================================================== */
.editorial-doc-wrap {
  padding: 3rem 1.5rem 6rem;
  background-color: var(--bg-main);
}

.editorial-doc-container {
  max-width: var(--container-article);
  margin: 0 auto;
}

.doc-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-secondary);
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.75rem;
}

.doc-breadcrumb a:hover {
  color: var(--color-black);
}

.doc-header {
  margin-bottom: 3.5rem;
}

.doc-meta-signal-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-secondary);
  border-bottom: 2px solid var(--color-black);
  padding-bottom: 0.75rem;
  margin-bottom: 1.75rem;
}

.doc-signal-tag {
  color: var(--color-black);
  background-color: var(--signal-lime);
  padding: 0.2rem 0.6rem;
}

.doc-title {
  font-size: clamp(2.5rem, 5.5vw, 4rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--color-black);
  line-height: 1.15;
  margin-bottom: 2rem;
}

.doc-meta-details {
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-secondary);
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
}

/* Quick Answer Section (GEO Essential) */
.quick-answer-box {
  background-color: var(--bg-subtle-1);
  border-left: 5px solid var(--signal-lime);
  border-top: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 1.75rem 2rem;
  margin-bottom: 3.5rem;
}

.quick-answer-title {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-black);
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.quick-answer-title::before {
  content: "⚡";
}

.quick-answer-text {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--color-black);
  font-weight: 500;
}

/* Article Table of Contents */
.doc-toc-wrap {
  background-color: var(--bg-subtle-3);
  border: 1px solid var(--color-border);
  padding: 1.75rem 2rem;
  margin-bottom: 3.5rem;
}

.doc-toc-title {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--color-black);
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
  display: flex;
  justify-content: space-between;
}

.doc-toc-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem 2rem;
}

.doc-toc-list a {
  font-size: 0.95rem;
  color: var(--color-body);
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.doc-toc-list a span {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-secondary);
}

.doc-toc-list a:hover {
  color: var(--color-black);
  text-decoration: underline;
}

/* Article Prose */
.doc-prose {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--color-body);
}

.doc-prose p {
  margin-bottom: 1.75rem;
}

.doc-prose h2 {
  font-size: 2.15rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--color-black);
  margin-top: 3.5rem;
  margin-bottom: 1.25rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.doc-prose h2 .h2-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--signal-lime);
  background-color: var(--color-black);
  padding: 0 0.5rem;
}

.doc-prose h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-top: 2.25rem;
  margin-bottom: 1rem;
  color: var(--color-black);
}

.doc-prose ul {
  list-style: disc;
  padding-left: 1.75rem;
  margin-bottom: 2rem;
}

.doc-prose ol {
  list-style: decimal;
  padding-left: 1.75rem;
  margin-bottom: 2rem;
}

.doc-prose li {
  margin-bottom: 0.75rem;
}

.doc-prose blockquote {
  border-left: 4px solid var(--color-black);
  padding-left: 1.5rem;
  font-style: italic;
  color: var(--color-secondary);
  margin: 2rem 0;
}

/* Real HTML Table in Prose */
.prose-table-wrap {
  overflow-x: auto;
  margin: 2.5rem 0;
  border: 1px solid var(--color-border);
}

.prose-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  text-align: left;
}

.prose-table th {
  background-color: var(--color-black);
  color: #FFFFFF;
  font-weight: 700;
  padding: 1rem 1.25rem;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

.prose-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-body);
}

.prose-table tr:nth-child(even) td {
  background-color: var(--bg-subtle-1);
}

.prose-table tr:hover td {
  background-color: rgba(184, 242, 58, 0.08);
}

/* Next Signal (Related Articles) */
.next-signal-box {
  margin-top: 5rem;
  border-top: 2px solid var(--color-black);
  padding-top: 3rem;
}

.next-signal-label {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--color-black);
  letter-spacing: 0.05em;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.next-signal-label span {
  background-color: var(--color-black);
  color: var(--signal-lime);
  padding: 0.15rem 0.6rem;
}

.next-signal-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.next-signal-card {
  border: 1px solid var(--color-border);
  padding: 1.75rem;
  background-color: var(--bg-subtle-1);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  text-decoration: none;
}

.next-signal-card:hover {
  border-color: var(--color-black);
  background-color: #FFFFFF;
}

.next-signal-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--color-secondary);
  margin-bottom: 0.75rem;
}

.next-signal-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-black);
  line-height: 1.4;
  margin-bottom: 1.25rem;
}

.next-signal-arrow {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-black);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

/* ==========================================================================
   Category Directory Layout
   ========================================================================== */
.category-dir-wrap {
  padding: 4rem 1.5rem 6rem;
}

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

.category-huge-header {
  border-bottom: 2px solid var(--color-black);
  padding-bottom: 3.5rem;
  margin-bottom: 4rem;
}

.category-tag-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--signal-lime);
  background-color: var(--color-black);
  padding: 0.2rem 0.6rem;
  display: inline-block;
  margin-bottom: 1.5rem;
}

.category-giant-title {
  font-size: clamp(3.5rem, 8vw, 7rem);
  font-weight: 900;
  letter-spacing: -0.05em;
  color: var(--color-black);
  line-height: 0.95;
  margin-bottom: 2rem;
}

.category-intro-lead {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--color-body);
  max-width: 900px;
}

.category-articles-index {
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   404 Signal Lost Page
   ========================================================================== */
.lost-404-wrap {
  padding: 8rem 1.5rem;
  text-align: center;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lost-404-container {
  max-width: 700px;
  margin: 0 auto;
}

.lost-404-num {
  font-size: clamp(6rem, 15vw, 13rem);
  font-weight: 900;
  line-height: 0.85;
  letter-spacing: -0.06em;
  color: var(--color-black);
  margin-bottom: 1rem;
}

.lost-signal-tag {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 900;
  background-color: var(--color-black);
  color: var(--signal-lime);
  display: inline-block;
  padding: 0.25rem 1rem;
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
}

.lost-desc {
  font-size: 1.25rem;
  color: var(--color-secondary);
  margin-bottom: 3rem;
}

.lost-nav-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-poster-section {
    height: auto;
    min-height: auto;
    padding: 3rem 1.5rem 2.5rem;
  }
  
  .hero-poster-container {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .hero-col-right {
    max-width: 440px;
    margin: 0 auto;
  }

  .menu-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .what-split-row {
    grid-template-columns: 260px 1fr;
  }
  
  .usecases-cross-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-giant-grid {
    grid-template-columns: 1fr;
  }
  
  .newspaper-blog-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .newspaper-sidebar-brand {
    position: static;
  }
  
  .footer-giant-nav {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .footer-secondary-grid {
    grid-template-columns: 1fr;
  }
  
  .next-signal-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 58px;
  }
  
  .header-ticker-wrap {
    display: none;
  }
  
  .header-actions .header-cta-link {
    display: none;
  }
  
  .hero-poster-section {
    padding: 2.25rem 1rem 1.75rem;
  }

  .hero-brand-title {
    font-size: clamp(2.5rem, 8vw, 3.5rem);
  }
  
  .what-split-row {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    padding: 1.75rem 0;
  }
  
  .device-row-item {
    grid-template-columns: 1fr auto;
    gap: 1rem;
    padding: 1.75rem 0;
  }
  
  .device-desc-pill {
    display: none;
  }
  
  .pricing-giant-block {
    padding: 2.5rem 1.5rem;
  }
  
  .faq-question-btn {
    grid-template-columns: 45px 1fr auto;
    gap: 0.75rem;
    padding: 1.75rem 0;
  }
  
  .faq-answer-panel {
    padding-left: 0;
  }
  
  .footer-giant-nav {
    grid-template-columns: 1fr;
  }
  
  .footer-nav-link {
    border-right: none;
    border-bottom: 1px solid var(--color-border-dark);
  }
  
  .doc-toc-list {
    grid-template-columns: 1fr;
  }
}

/* Mobile 430 / 390 / 375 px */
@media (max-width: 430px) {
  .menu-grid {
    grid-template-columns: 1fr;
    margin: 1.5rem 0;
  }
  
  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
    gap: 1.25rem;
  }
  
  .signal-cta-btn {
    width: 100%;
  }

  .hero-sculpture-wrapper {
    max-width: 320px;
  }
}

/* ==========================================================================
   Prefers-Reduced-Motion (Strict Accessibility)
   ========================================================================== */
@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;
  }
  
  .ticker-track, .header-ticker-track {
    animation: none !important;
  }
}