/* ==========================================================================
   飞鸟云 FlyingBird · 纸飞机折纸飞行工坊 (Paper-Airplane Workshop)
   Color Palette:
     - Paper White: #FAF8F1 (基底纸白)
     - Graphite: #30343B (铅笔墨黑)
     - Folded-Paper Blue: #5579B8 (折纸靛蓝)
     - Origami Orange: #E99646 (折痕暖橙)
     - Craft Tint: #F2EDE2 (牛皮轻卡)
     - Crease Border: #E0D7C6 (折线边框)
   ========================================================================== */

:root {
  --color-paper: #FAF8F1;
  --color-paper-alt: #F4EFE6;
  --color-paper-card: #FFFFFF;
  --color-graphite: #30343B;
  --color-graphite-light: #5A5F69;
  --color-blue: #5579B8;
  --color-blue-dark: #3F5E94;
  --color-orange: #E99646;
  --color-orange-dark: #CB792D;
  --color-crease: #E2D9C8;
  --color-crease-dark: #BDB19C;
  --color-stamp-red: #C84B31;
  --color-highlight: #FFF5D6;

  --font-serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", SimSun, STSong, "PT Serif", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace;

  --shadow-paper: 0 4px 14px rgba(48, 52, 59, 0.07), 0 1px 3px rgba(48, 52, 59, 0.05);
  --shadow-paper-hover: 0 12px 28px rgba(48, 52, 59, 0.12), 0 4px 10px rgba(48, 52, 59, 0.06);
  --shadow-layered: 3px 3px 0 var(--color-crease-dark), 6px 6px 0 var(--color-crease);

  --radius-paper: 3px;
  --container-max: 1200px;
  --transition-smooth: all 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* 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 {
  background-color: var(--color-paper);
  color: var(--color-graphite);
  font-family: var(--font-sans);
  line-height: 1.7;
  font-weight: 400;
  overflow-x: hidden;
  background-image: 
    radial-gradient(#E8E0D0 0.8px, transparent 0.8px),
    linear-gradient(to right, rgba(226, 217, 200, 0.15) 1px, transparent 1px);
  background-size: 24px 24px, 120px 120px;
  background-position: 0 0, 0 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6, .font-serif {
  font-family: var(--font-serif);
  color: var(--color-graphite);
  line-height: 1.35;
  font-weight: 700;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  margin-bottom: 0.75rem;
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.6rem);
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-blue);
  text-decoration: none;
  transition: var(--transition-smooth);
}

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

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

/* Accessibility Focus States */
a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px dashed var(--color-orange);
  outline-offset: 4px;
}

/* Reduced Motion Support */
@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;
  }
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.section-spacing {
  padding-top: 4.5rem;
  padding-bottom: 4.5rem;
  position: relative;
}

@media (max-width: 768px) {
  .section-spacing {
    padding-top: 3.25rem;
    padding-bottom: 3.25rem;
  }
}

/* Paper Fold Line Divider */
.fold-separator {
  position: relative;
  width: 100%;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 1.5rem 0;
  overflow: hidden;
}

.fold-separator::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  border-bottom: 1.5px dashed var(--color-crease-dark);
}

.fold-separator-tag {
  position: relative;
  background-color: var(--color-paper);
  padding: 0 16px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--color-graphite-light);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-transform: uppercase;
}

.fold-separator-tag::before {
  content: "✂";
  font-size: 0.9rem;
  color: var(--color-orange);
}

/* Handwritten / Sketch Annotations (Pure CSS / SVG) */
.handwritten-tag {
  display: inline-block;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.9rem;
  color: var(--color-orange);
  background: rgba(233, 150, 70, 0.1);
  padding: 2px 10px;
  border-radius: 12px 2px 10px 3px;
  border: 1px dashed var(--color-orange);
  transform: rotate(-1.5deg);
}

.paper-stamp {
  display: inline-block;
  padding: 4px 10px;
  border: 2px solid var(--color-stamp-red);
  color: var(--color-stamp-red);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 3px;
  transform: rotate(-2deg);
  box-shadow: inset 0 0 0 1px var(--color-stamp-red);
  opacity: 0.9;
}

.tape-top {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%) rotate(1deg);
  width: 80px;
  height: 22px;
  background: rgba(244, 237, 219, 0.85);
  border-left: 1px dashed rgba(189, 177, 156, 0.6);
  border-right: 1px dashed rgba(189, 177, 156, 0.6);
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
  pointer-events: none;
  z-index: 2;
}

/* Buttons & Commercial CTAs */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0.75rem 1.6rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-paper);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition-smooth);
  text-decoration: none;
  line-height: 1.2;
  position: relative;
}

.btn-primary {
  background-color: var(--color-blue);
  color: #FFFFFF !important;
  border-color: var(--color-blue);
  box-shadow: 3px 3px 0 var(--color-graphite);
}

.btn-primary:hover {
  background-color: var(--color-blue-dark);
  border-color: var(--color-blue-dark);
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--color-graphite);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-graphite) !important;
  border: 2px solid var(--color-graphite);
  box-shadow: 3px 3px 0 var(--color-crease-dark);
}

.btn-secondary:hover {
  background-color: var(--color-paper-alt);
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--color-graphite);
}

.btn-accent {
  background-color: var(--color-orange);
  color: #FFFFFF !important;
  border-color: var(--color-orange);
  box-shadow: 3px 3px 0 var(--color-graphite);
}

.btn-accent:hover {
  background-color: var(--color-orange-dark);
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--color-graphite);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(250, 248, 241, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 2px dashed var(--color-crease);
  padding: 0.85rem 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-graphite);
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  text-decoration: none;
}

.brand-logo svg {
  width: 32px;
  height: 32px;
  fill: none;
  stroke: var(--color-blue);
  stroke-width: 2;
  transition: transform 0.3s ease;
}

.brand-logo:hover svg {
  transform: translateY(-2px) rotate(8deg);
  stroke: var(--color-orange);
}

.brand-tag {
  font-size: 0.72rem;
  background: var(--color-orange);
  color: #fff;
  padding: 2px 6px;
  border-radius: 2px;
  font-family: var(--font-sans);
  font-weight: 600;
  vertical-align: middle;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
}

.nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.15rem;
}

.nav-link {
  color: var(--color-graphite);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 4px 2px;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-orange);
  transition: width 0.25s ease;
}

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

.header-cta {
  padding: 0.45rem 1rem;
  font-size: 0.9rem;
}

/* Mobile Hamburger */
.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-crease-dark);
  padding: 8px 10px;
  border-radius: 4px;
  cursor: pointer;
  color: var(--color-graphite);
}

.menu-toggle svg {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  stroke-width: 2;
}

@media (max-width: 992px) {
  .menu-toggle {
    display: block;
  }

  .main-nav {
    position: fixed;
    top: 61px;
    left: 0;
    right: 0;
    background-color: var(--color-paper);
    border-bottom: 2px solid var(--color-crease-dark);
    box-shadow: 0 10px 20px rgba(0,0,0,0.08);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.25rem;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-smooth);
  }

  .main-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: 0.85rem;
  }

  .nav-link {
    font-size: 1.05rem;
    display: block;
    width: 100%;
    padding: 6px 0;
    border-bottom: 1px dashed var(--color-crease);
  }

  .header-cta {
    width: 100%;
    text-align: center;
  }
}

/* ==========================================================================
   Hero Section: Oversized Typography + Folded Paper Landscape
   ========================================================================== */
.hero-section {
  padding-top: 3.5rem;
  padding-bottom: 3rem;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 3rem;
}

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

.hero-headline-wrap {
  position: relative;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-blue);
  font-weight: 600;
  margin-bottom: 0.75rem;
  background: rgba(85, 121, 184, 0.08);
  padding: 4px 12px;
  border-radius: 20px;
}

.hero-title {
  margin-bottom: 1.25rem;
  line-height: 1.18;
}

.hero-title .highlight-brand {
  color: var(--color-blue);
  position: relative;
  display: inline-block;
}

.hero-title .highlight-brand::after {
  content: "";
  position: absolute;
  bottom: 6px;
  left: 0;
  right: 0;
  height: 8px;
  background-color: rgba(233, 150, 70, 0.25);
  z-index: -1;
  transform: rotate(-1deg);
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--color-graphite-light);
  margin-bottom: 2rem;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  margin-bottom: 2rem;
}

.hero-meta-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--color-graphite-light);
  border-top: 1px dashed var(--color-crease);
  padding-top: 1.25rem;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-meta-item svg {
  width: 16px;
  height: 16px;
  stroke: var(--color-orange);
}

/* Folded-Paper Landscape Art */
.hero-art-wrapper {
  position: relative;
  background: linear-gradient(135deg, #FFFFFF 0%, var(--color-paper-alt) 100%);
  border: 2px solid var(--color-crease-dark);
  box-shadow: 6px 6px 0 var(--color-graphite);
  padding: 1.5rem;
  border-radius: var(--radius-paper);
}

.landscape-svg {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 4px 6px rgba(48,52,59,0.08));
}

.art-caption {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--color-graphite-light);
  margin-top: 0.75rem;
  text-align: right;
  display: flex;
  justify-content: space-between;
}

/* ==========================================================================
   Interactive Paper Airplane Workshop Mini-Game
   ========================================================================== */
.game-section {
  background-color: #FFFFFF;
  border-top: 2px solid var(--color-crease);
  border-bottom: 2px solid var(--color-crease);
  position: relative;
}

.game-container {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 900px) {
  .game-container {
    grid-template-columns: 1fr;
  }
}

.game-controls-panel {
  background: var(--color-paper);
  border: 2px solid var(--color-crease-dark);
  padding: 1.5rem;
  border-radius: var(--radius-paper);
  box-shadow: 4px 4px 0 var(--color-crease-dark);
}

.game-controls-title {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.game-slider-group {
  margin-bottom: 1.5rem;
}

.game-slider-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.angle-slider {
  width: 100%;
  height: 8px;
  background: var(--color-crease);
  border-radius: 4px;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
}

.angle-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  background: var(--color-orange);
  border: 2px solid var(--color-graphite);
  border-radius: 50%;
  cursor: grab;
  box-shadow: 0 2px 4px rgba(0,0,0,0.15);
}

.game-actions-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.game-score-card {
  background: #FFFFFF;
  border: 1px dashed var(--color-crease-dark);
  padding: 0.75rem;
  border-radius: 3px;
  margin-bottom: 1rem;
}

.score-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  margin-bottom: 4px;
}

.score-value {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-blue);
}

.game-disclaimer {
  font-size: 0.75rem;
  color: var(--color-graphite-light);
  line-height: 1.5;
  border-top: 1px dashed var(--color-crease);
  padding-top: 0.75rem;
}

.flight-canvas-wrap {
  position: relative;
  background: linear-gradient(to bottom, #FAF8F1 0%, #FFFFFF 100%);
  border: 2px solid var(--color-graphite);
  box-shadow: 6px 6px 0 var(--color-blue);
  border-radius: var(--radius-paper);
  overflow: hidden;
  height: 380px;
}

#flightCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.canvas-overlay-ui {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(250, 248, 241, 0.9);
  border: 1px solid var(--color-crease-dark);
  padding: 4px 10px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  border-radius: 3px;
  pointer-events: none;
}

/* ==========================================================================
   Editorial Advantages (Not Just Identical Cards!)
   ========================================================================== */
.editorial-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  margin-bottom: 2.5rem;
  align-items: center;
}

@media (max-width: 900px) {
  .editorial-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.editorial-note {
  background: var(--color-paper-alt);
  border: 1px solid var(--color-crease-dark);
  border-left: 6px solid var(--color-blue);
  padding: 2rem;
  box-shadow: var(--shadow-paper);
  position: relative;
}

.advantage-rows {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.adv-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 1.25rem;
  align-items: start;
  background: #FFFFFF;
  border: 1px solid var(--color-crease);
  padding: 1.25rem;
  border-radius: var(--radius-paper);
  box-shadow: 2px 2px 0 var(--color-crease);
  transition: var(--transition-smooth);
}

.adv-item:hover {
  transform: translateX(4px);
  border-color: var(--color-blue);
  box-shadow: 4px 4px 0 var(--color-blue);
}

.adv-icon-box {
  width: 54px;
  height: 54px;
  background: rgba(85, 121, 184, 0.1);
  border: 1px solid var(--color-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
}

.adv-icon-box svg {
  width: 28px;
  height: 28px;
  stroke: var(--color-blue);
}

.adv-title {
  font-size: 1.15rem;
  margin-bottom: 0.35rem;
}

.adv-desc {
  font-size: 0.92rem;
  color: var(--color-graphite-light);
  line-height: 1.6;
}

/* ==========================================================================
   Illustrated Network Route (Global Origami Flights)
   ========================================================================== */
.network-section {
  background-color: var(--color-paper-alt);
  border-top: 1px dashed var(--color-crease-dark);
  border-bottom: 1px dashed var(--color-crease-dark);
}

.route-schematic {
  background: #FFFFFF;
  border: 2px solid var(--color-graphite);
  box-shadow: 6px 6px 0 var(--color-crease-dark);
  padding: 2rem;
  border-radius: var(--radius-paper);
  margin-bottom: 2.5rem;
}

.route-svg {
  width: 100%;
  height: auto;
  min-height: 240px;
}

.node-matrix {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.node-pill-card {
  background: #FFFFFF;
  border: 1px solid var(--color-crease);
  padding: 1.25rem;
  border-radius: var(--radius-paper);
  position: relative;
  transition: var(--transition-smooth);
}

.node-pill-card:hover {
  border-color: var(--color-orange);
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(48,52,59,0.06);
}

.node-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.node-region {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.1rem;
}

.node-tag {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: var(--color-paper-alt);
  padding: 2px 6px;
  border: 1px solid var(--color-crease);
  border-radius: 2px;
}

/* ==========================================================================
   AI & Streaming Field Notes (Notebook / Paper Slips)
   ========================================================================== */
.field-notes-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

@media (max-width: 850px) {
  .field-notes-layout {
    grid-template-columns: 1fr;
  }
}

.notebook-column {
  background: #FFFFFF;
  border: 2px solid var(--color-crease-dark);
  box-shadow: 4px 4px 0 var(--color-crease);
  padding: 1.75rem;
  border-radius: var(--radius-paper);
  position: relative;
}

.notebook-column::before {
  content: "";
  position: absolute;
  top: 0;
  left: 24px;
  bottom: 0;
  width: 2px;
  border-left: 1px solid rgba(200, 75, 49, 0.3);
}

.notebook-header {
  padding-left: 20px;
  margin-bottom: 1.5rem;
  border-bottom: 2px dashed var(--color-crease);
  padding-bottom: 0.75rem;
}

.app-checklist {
  list-style: none;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.app-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-crease);
}

.app-item:last-child {
  border-bottom: none;
}

.app-title-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-graphite);
}

.app-status {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: rgba(85, 121, 184, 0.1);
  color: var(--color-blue);
  padding: 2px 8px;
  border-radius: 12px;
  font-weight: 600;
}

.app-desc {
  font-size: 0.88rem;
  color: var(--color-graphite-light);
  line-height: 1.5;
}

/* ==========================================================================
   Pricing Section: Layered Paper Sheets
   ========================================================================== */
.pricing-section {
  background-color: var(--color-paper);
  position: relative;
}

.pricing-disclaimer-box {
  background: var(--color-paper-alt);
  border: 1px dashed var(--color-crease-dark);
  padding: 1rem 1.5rem;
  font-size: 0.88rem;
  color: var(--color-graphite-light);
  margin-bottom: 2.5rem;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.pricing-disclaimer-box svg {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  stroke: var(--color-orange);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.75rem;
  align-items: stretch;
}

/* Layered Paper Sheet Card */
.pricing-sheet {
  background: #FFFFFF;
  border: 2px solid var(--color-crease-dark);
  border-radius: var(--radius-paper);
  padding: 2rem 1.5rem;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 4px 4px 0 var(--color-crease);
  transition: var(--transition-smooth);
}

.pricing-sheet:hover {
  transform: translateY(-4px);
  border-color: var(--color-graphite);
  box-shadow: 6px 6px 0 var(--color-graphite);
}

/* Featured Paper Sheet */
.pricing-sheet.featured-plan {
  border-color: var(--color-blue);
  box-shadow: 6px 6px 0 var(--color-blue);
  background: #FFFFFF;
  transform: translateY(-6px);
}

.pricing-sheet.featured-plan:hover {
  transform: translateY(-10px);
  box-shadow: 8px 8px 0 var(--color-blue-dark);
}

.plan-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-blue);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 14px;
  border-radius: 12px;
  white-space: nowrap;
  letter-spacing: 0.05em;
  box-shadow: 0 2px 4px rgba(0,0,0,0.15);
}

.plan-header {
  margin-bottom: 1.25rem;
  border-bottom: 1px dashed var(--color-crease);
  padding-bottom: 1.25rem;
}

.plan-title {
  font-size: 1.3rem;
  margin-bottom: 0.35rem;
}

.plan-tagline {
  font-size: 0.85rem;
  color: var(--color-graphite-light);
}

.plan-price-wrap {
  margin-bottom: 1.5rem;
}

.plan-price-val {
  font-size: 2.2rem;
  font-weight: 700;
  font-family: var(--font-serif);
  color: var(--color-graphite);
  line-height: 1;
}

.plan-price-unit {
  font-size: 0.85rem;
  color: var(--color-graphite-light);
  margin-left: 4px;
}

.plan-price-status {
  display: block;
  font-size: 0.75rem;
  color: var(--color-orange-dark);
  font-family: var(--font-mono);
  margin-top: 4px;
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 2rem;
  font-size: 0.9rem;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-graphite);
}

.plan-feature-item svg {
  width: 16px;
  height: 16px;
  stroke: var(--color-blue);
  flex-shrink: 0;
}

.plan-action {
  margin-top: auto;
}

/* ==========================================================================
   Article Grid (3x3 Desktop, 2-Col Tablet, 1-Col Mobile)
   ========================================================================== */
.articles-section {
  background-color: var(--color-paper-alt);
}

.articles-grid-3x3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

@media (max-width: 1024px) {
  .articles-grid-3x3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .articles-grid-3x3 {
    grid-template-columns: 1fr;
  }
}

.article-card {
  background: #FFFFFF;
  border: 1px solid var(--color-crease-dark);
  border-radius: var(--radius-paper);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-paper);
  transition: var(--transition-smooth);
  position: relative;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-blue);
  box-shadow: 4px 4px 0 var(--color-blue);
}

.article-card-thumb {
  background: var(--color-paper);
  padding: 1.5rem;
  border-bottom: 1px dashed var(--color-crease);
  display: flex;
  align-items: center;
  justify-content: center;
  height: 140px;
}

.article-card-thumb svg {
  width: 64px;
  height: 64px;
  stroke: var(--color-blue);
  transition: transform 0.3s ease;
}

.article-card:hover .article-card-thumb svg {
  transform: scale(1.08) rotate(3deg);
  stroke: var(--color-orange);
}

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

.article-meta-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--color-graphite-light);
  margin-bottom: 0.65rem;
}

.article-card-title {
  font-size: 1.15rem;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.article-card-title a {
  color: var(--color-graphite);
}

.article-card-title a:hover {
  color: var(--color-blue);
}

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

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  border-top: 1px dashed var(--color-crease);
  padding-top: 0.75rem;
}

/* ==========================================================================
   Demo Testimonials (Marked Visibly)
   ========================================================================== */
.reviews-section {
  background: #FFFFFF;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.review-paper-card {
  background: var(--color-paper);
  border: 1px solid var(--color-crease-dark);
  padding: 1.5rem;
  border-radius: var(--radius-paper);
  position: relative;
  box-shadow: 3px 3px 0 var(--color-crease);
}

.review-badge-demo {
  display: inline-block;
  background: rgba(200, 75, 49, 0.1);
  color: var(--color-stamp-red);
  border: 1px dashed var(--color-stamp-red);
  font-size: 0.72rem;
  font-family: var(--font-mono);
  padding: 2px 6px;
  border-radius: 2px;
  margin-bottom: 0.75rem;
}

.review-quote {
  font-size: 0.92rem;
  color: var(--color-graphite);
  font-style: italic;
  margin-bottom: 1rem;
  line-height: 1.6;
}

.review-author-line {
  display: flex;
  align-items: center;
  gap: 10px;
}

.review-avatar-char {
  width: 36px;
  height: 36px;
  background: var(--color-blue);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.review-author-info {
  font-size: 0.82rem;
}

.review-author-name {
  font-weight: 700;
  color: var(--color-graphite);
}

.review-author-role {
  color: var(--color-graphite-light);
}

/* ==========================================================================
   Accordion FAQ Section
   ========================================================================== */
.faq-accordion {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: #FFFFFF;
  border: 1px solid var(--color-crease-dark);
  border-radius: var(--radius-paper);
  box-shadow: 2px 2px 0 var(--color-crease);
  overflow: hidden;
  transition: var(--transition-smooth);
}

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

.faq-question-btn {
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  padding: 1.25rem 1.5rem;
  font-size: 1.05rem;
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--color-graphite);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-toggle-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  stroke: var(--color-blue);
  transition: transform 0.25s ease;
}

.faq-item.is-active .faq-toggle-icon {
  transform: rotate(180deg);
  stroke: var(--color-orange);
}

.faq-answer {
  padding: 0 1.5rem 1.25rem 1.5rem;
  color: var(--color-graphite-light);
  font-size: 0.95rem;
  line-height: 1.65;
  display: none;
  border-top: 1px dashed var(--color-crease);
  padding-top: 1rem;
}

.faq-item.is-active .faq-answer {
  display: block;
}

/* ==========================================================================
   Article Detail Page Layout (SEO Article Template)
   ========================================================================== */
.article-header {
  padding-top: 3.5rem;
  padding-bottom: 2rem;
  background: linear-gradient(to bottom, #FAF8F1 0%, var(--color-paper-alt) 100%);
  border-bottom: 1px solid var(--color-crease);
}

.breadcrumb-nav {
  margin-bottom: 1.25rem;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--color-graphite-light);
}

.breadcrumb-nav a {
  color: var(--color-blue);
}

.breadcrumb-nav span {
  margin: 0 6px;
  color: var(--color-crease-dark);
}

.article-title-hero {
  margin-bottom: 1rem;
}

.article-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.85rem;
  color: var(--color-graphite-light);
  font-family: var(--font-mono);
}

.article-body-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 3rem 1.25rem;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--color-graphite);
}

.article-content h2 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px dashed var(--color-crease);
}

.article-content h3 {
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  color: var(--color-blue);
}

.article-content p {
  margin-bottom: 1.25rem;
}

.article-content ul, .article-content ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

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

.article-callout-box {
  background: #FFFFFF;
  border: 1px solid var(--color-crease-dark);
  border-left: 5px solid var(--color-orange);
  padding: 1.25rem 1.5rem;
  margin: 1.75rem 0;
  border-radius: var(--radius-paper);
  box-shadow: 2px 2px 0 var(--color-crease);
}

.article-callout-box h4 {
  margin-bottom: 0.5rem;
  color: var(--color-orange-dark);
}

.article-related-links {
  margin-top: 3.5rem;
  border-top: 2px dashed var(--color-crease);
  padding-top: 2rem;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.related-item-card {
  background: #FFFFFF;
  border: 1px solid var(--color-crease);
  padding: 1.25rem;
  border-radius: 3px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: var(--transition-smooth);
}

.related-item-card:hover {
  border-color: var(--color-blue);
  box-shadow: 3px 3px 0 var(--color-blue);
}

/* ==========================================================================
   Concise & Standard Footer
   ========================================================================== */
.site-footer {
  background: var(--color-graphite);
  color: #D3D7DF;
  padding-top: 3.5rem;
  padding-bottom: 2rem;
  border-top: 4px solid var(--color-orange);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 500px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-col-title {
  color: #FFFFFF;
  font-size: 1.05rem;
  margin-bottom: 1rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer-col-title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background-color: var(--color-orange);
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-links-list a {
  color: #B5BAC5;
}

.footer-links-list a:hover {
  color: #FFFFFF;
  padding-left: 4px;
}

.footer-bottom-bar {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 0.82rem;
  color: #8E94A0;
}

.footer-legal-links {
  display: flex;
  gap: 1.25rem;
}

.footer-legal-links a {
  color: #8E94A0;
}

.footer-legal-links a:hover {
  color: #FFFFFF;
}