/* ==========================================================================
   飞鸟 FEINIAO · DESIGN SYSTEM & STYLESHEET
   Paper-Cut Open Sky Aesthetic / 剪纸天空艺术风格
   ========================================================================== */

/* --- 1. Custom Properties / 调色板与设计变量 --- */
:root {
  /* Brand Color Palette */
  --bg-main: #F5FAFF;
  --surface-white: #FFFFFF;
  --primary-blue: #397DF6;
  --primary-hover: #2667DD;
  --primary-active: #1D54B8;
  --primary-light: #EBF3FF;
  --text-navy: #183153;
  --text-muted: #4D6482;
  --text-light: #7E93AC;
  --pale-blue: #DCEEFF;
  --pale-blue-tint: #F0F7FD;
  --mint-accent: #AFE7D5;
  --mint-tint: #E8F9F3;
  --sunrise-accent: #FFC77D;
  --sunrise-glow: #FFF6E8;
  --border-light: #E2EDF8;
  --border-subtle: rgba(24, 49, 83, 0.08);

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* Paper Shadows */
  --shadow-paper-xs: 0 1px 3px rgba(24, 49, 83, 0.04), 0 1px 2px rgba(24, 49, 83, 0.02);
  --shadow-paper-sm: 0 3px 8px rgba(24, 49, 83, 0.04), 0 1px 3px rgba(24, 49, 83, 0.03);
  --shadow-paper-md: 0 8px 24px -4px rgba(24, 49, 83, 0.06), 0 2px 6px -1px rgba(24, 49, 83, 0.03);
  --shadow-paper-lg: 0 16px 36px -6px rgba(24, 49, 83, 0.08), 0 4px 12px -2px rgba(57, 125, 246, 0.05);
  --shadow-paper-hover: 0 20px 40px -8px rgba(57, 125, 246, 0.12), 0 6px 16px -2px rgba(24, 49, 83, 0.05);

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 9999px;

  /* Container */
  --container-max: 1180px;
  --header-height: 72px;

  /* Transitions */
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-navy);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  position: relative;
}

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

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

ul, ol {
  list-style: none;
}

/* Accessibility Skip Link */
.skip-to-content {
  position: absolute;
  top: -80px;
  left: 20px;
  padding: 12px 20px;
  background: var(--primary-blue);
  color: #fff;
  border-radius: var(--radius-md);
  font-weight: 600;
  z-index: 9999;
  transition: top 0.2s ease;
}

.skip-to-content:focus {
  top: 20px;
}

/* Focus Visible Styling */
:focus-visible {
  outline: 2px solid var(--primary-blue);
  outline-offset: 3px;
}

/* Screen Reader Only Utility */
.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;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.text-center {
  text-align: center;
}

/* --- 3. Buttons & Badges --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all 0.25s var(--ease-spring);
  text-align: center;
  white-space: nowrap;
  cursor: pointer;
  position: relative;
}

.btn-primary {
  background-color: var(--primary-blue);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(57, 125, 246, 0.25), 0 1px 3px rgba(24, 49, 83, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 6px 20px rgba(57, 125, 246, 0.35), 0 2px 4px rgba(24, 49, 83, 0.08);
  transform: translateY(-1.5px);
}

.btn-primary:active {
  background-color: var(--primary-active);
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--surface-white);
  color: var(--text-navy);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-paper-xs);
}

.btn-secondary:hover {
  border-color: var(--primary-blue);
  color: var(--primary-blue);
  box-shadow: var(--shadow-paper-sm);
  transform: translateY(-1.5px);
}

.btn-secondary:active {
  background-color: var(--pale-blue-tint);
  transform: translateY(0);
}

.btn-large {
  padding: 14px 30px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.875rem;
}

.btn-full {
  width: 100%;
}

.btn-arrow {
  transition: transform 0.2s ease;
}

.btn:hover .btn-arrow {
  transform: translateX(3px);
}

/* Section Marker with Feather */
.section-marker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background-color: var(--pale-blue-tint);
  border: 1px solid var(--pale-blue);
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
}

.marker-feather-svg {
  width: 20px;
  height: 14px;
}

.marker-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--primary-blue);
}

.section {
  padding: 96px 0;
  position: relative;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-navy);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.section-lead {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

/* ==========================================================================
   4. HEADER / 顶部导航栏
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  transition: box-shadow 0.25s ease;
}

.site-header.scrolled {
  box-shadow: 0 4px 20px rgba(24, 49, 83, 0.06);
}

.header-container {
  max-width: var(--container-max);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* Brand Link */
.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo-wrap {
  width: 40px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.bird-logo-svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 2px 4px rgba(57, 125, 246, 0.2));
  transition: transform 0.3s var(--ease-spring);
}

.brand-link:hover .bird-logo-svg {
  transform: translateY(-2px) scale(1.05);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-navy);
  line-height: 1.1;
}

.brand-sub {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--primary-blue);
  line-height: 1;
}

/* Nav Menu */
.main-nav {
  display: flex;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-navy);
  position: relative;
  padding: 6px 0;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 18px;
  height: 2px;
  background-color: var(--primary-blue);
  border-radius: 2px;
  transition: transform 0.25s var(--ease-spring);
}

.nav-link:hover {
  color: var(--primary-blue);
}

.nav-link.active {
  color: var(--primary-blue);
  font-weight: 600;
}

.nav-link.active::after {
  transform: translateX(-50%) scaleX(1);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-header {
  padding: 8px 18px;
  font-size: 0.875rem;
  border-radius: var(--radius-md);
}

/* Mobile Hamburger Toggle */
.mobile-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: var(--radius-sm);
  color: var(--text-navy);
}

.hamburger-bar {
  width: 22px;
  height: 2px;
  background-color: currentColor;
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.mobile-toggle[aria-expanded="true"] .hamburger-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-toggle[aria-expanded="true"] .hamburger-bar:nth-child(2) {
  opacity: 0;
}

.mobile-toggle[aria-expanded="true"] .hamburger-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: 1050;
  display: flex;
  justify-content: flex-end;
}

.mobile-drawer[hidden] {
  display: none;
}

.drawer-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(24, 49, 83, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: fadeIn 0.25s ease;
}

.drawer-content {
  position: relative;
  width: 80%;
  max-width: 320px;
  height: 100%;
  background: var(--surface-white);
  padding: 24px;
  display: flex;
  flex-direction: column;
  box-shadow: -8px 0 24px rgba(24, 49, 83, 0.12);
  animation: slideInRight 0.3s var(--ease-spring);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}

.drawer-brand {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.drawer-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

.drawer-close:hover {
  color: var(--text-navy);
  background: var(--pale-blue-tint);
}

.drawer-nav-list {
  display: flex;
  flex-direction: column;
  padding: 24px 0;
  gap: 8px;
  flex: 1;
}

.drawer-link {
  display: block;
  padding: 12px 14px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-navy);
  border-radius: var(--radius-sm);
  transition: background 0.15s ease, color 0.15s ease;
}

.drawer-link:hover, .drawer-link:active {
  background: var(--pale-blue-tint);
  color: var(--primary-blue);
}

.drawer-footer {
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
}

.drawer-note {
  font-size: 0.8125rem;
  text-align: center;
  color: var(--text-light);
  margin-top: 12px;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideInRight {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

/* ==========================================================================
   5. CENTERED HERO / 居中英雄展区
   ========================================================================== */
.hero-section {
  position: relative;
  padding-top: 64px;
  padding-bottom: 0;
  text-align: center;
  overflow: hidden;
  background: linear-gradient(180deg, #F5FAFF 0%, #FFFFFF 100%);
}

.hero-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Brand Pill */
.hero-pill-wrap {
  margin-bottom: 24px;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  background-color: var(--surface-white);
  border: 1px solid var(--pale-blue);
  border-radius: var(--radius-pill);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-navy);
  box-shadow: var(--shadow-paper-xs);
}

.pill-feather-icon {
  flex-shrink: 0;
}

/* Headline */
.hero-headline {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-navy);
  line-height: 1.18;
  margin-bottom: 20px;
  max-width: 800px;
}

/* Subtext */
.hero-subtext {
  font-size: 1.1875rem;
  color: var(--text-muted);
  max-width: 620px;
  line-height: 1.7;
  margin-bottom: 36px;
}

/* Hero Action Buttons */
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

/* Panoramic Sky Artwork */
.hero-sky-artwork {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.panoramic-sky-svg {
  width: 100%;
  height: auto;
  overflow: visible;
}

/* Gentle Swallow Glider Animation */
.hero-swallow-glider {
  transform-origin: 100px 50px;
  animation: swallowFloat 6s ease-in-out infinite alternate;
}

@keyframes swallowFloat {
  0% {
    transform: translate(470px, 114px) rotate(-1deg);
  }
  50% {
    transform: translate(490px, 98px) rotate(1.5deg);
  }
  100% {
    transform: translate(480px, 108px) rotate(0deg);
  }
}

/* Distant Birds Gentle Sway */
.distant-birds {
  animation: distantFloat 8s ease-in-out infinite alternate;
}

@keyframes distantFloat {
  0% { transform: translateY(0); }
  100% { transform: translateY(-6px); }
}

/* Dotted Flight Trail Subtle Pulse */
.flight-trail-path {
  stroke-dashoffset: 0;
  animation: trailDrift 20s linear infinite;
}

@keyframes trailDrift {
  to { stroke-dashoffset: -96; }
}

/* ==========================================================================
   6. FLOATING QUICK-NAV PANEL / 悬浮快捷导航
   ========================================================================== */
.quick-nav-section {
  position: relative;
  z-index: 10;
  margin-top: -36px; /* Pull upward to overlap panoramic artwork gracefully */
  padding-bottom: 24px;
}

.quick-nav-card {
  background: var(--surface-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-paper-lg);
  padding: 12px;
}

.quick-nav-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
}

.quick-divider {
  width: 1px;
  height: 60px;
  background-color: var(--border-light);
}

.quick-nav-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  border-radius: var(--radius-lg);
  transition: all 0.25s var(--ease-spring);
  text-decoration: none;
}

.quick-nav-item:hover {
  background-color: var(--pale-blue-tint);
  transform: translateY(-2px);
}

.quick-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--pale-blue-tint);
  border: 1px solid var(--pale-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.quick-nav-item:hover .quick-icon-box {
  background-color: var(--surface-white);
  transform: scale(1.05);
}

.quick-nav-text {
  flex: 1;
  min-width: 0;
}

.quick-nav-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--primary-blue);
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.quick-nav-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-navy);
  margin-bottom: 3px;
}

.quick-nav-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.quick-nav-arrow {
  color: var(--text-light);
  transition: transform 0.2s ease, color 0.2s ease;
  flex-shrink: 0;
}

.quick-nav-item:hover .quick-nav-arrow {
  color: var(--primary-blue);
  transform: translateX(4px);
}

/* ==========================================================================
   7. CORE ADVANTAGES / 核心优势 (非对称网格)
   ========================================================================== */
.advantages-section {
  background-color: var(--bg-main);
}

.asymmetric-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 28px;
  margin-top: 56px;
}

.feature-card {
  background: var(--surface-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-paper-md);
  transition: transform 0.3s var(--ease-spring), box-shadow 0.3s var(--ease-spring);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-paper-hover);
  border-color: #CFE3F8;
}

/* Left Large Panel */
.feature-card-large {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 44px;
}

.card-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--primary-blue);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.card-headline {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-navy);
  margin-bottom: 16px;
  line-height: 1.3;
}

.card-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.client-compat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.compat-tag {
  display: inline-block;
  padding: 6px 14px;
  background-color: var(--pale-blue-tint);
  border: 1px solid var(--pale-blue);
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-navy);
}

.feature-artwork-feather-progression {
  margin-top: 28px;
  background: linear-gradient(180deg, #F5FAFF 0%, #FFFFFF 100%);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  padding: 16px 8px;
}

.progression-svg {
  width: 100%;
  height: auto;
}

/* Right Stacked Panels */
.asymmetric-stack {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.feature-card-secondary {
  padding: 36px;
  display: flex;
  flex-direction: column;
}

.card-icon-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background-color: var(--pale-blue-tint);
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary-blue);
  width: fit-content;
  margin-bottom: 14px;
}

.card-headline-sm {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-navy);
  margin-bottom: 12px;
}

.device-dots-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.device-badge {
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--bg-main);
  border: 1px solid var(--border-light);
  color: var(--text-navy);
}

.rhythm-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 24px;
}

.stat-pill {
  background: var(--bg-main);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  text-align: center;
}

.stat-val {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--primary-blue);
}

.stat-lbl {
  display: block;
  font-size: 0.6875rem;
  color: var(--text-light);
  margin-top: 2px;
}

/* ==========================================================================
   8. USAGE SCENARIOS / 使用场景 (选项卡式探索器)
   ========================================================================== */
.scenarios-section {
  background: var(--surface-white);
}

.tab-explorer {
  margin-top: 50px;
}

.tab-controls-wrap {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.scenario-tab {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  background-color: var(--pale-blue-tint);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-pill);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.25s var(--ease-spring);
}

.scenario-tab:hover {
  color: var(--primary-blue);
  background-color: var(--pale-blue);
  border-color: var(--pale-blue);
}

.scenario-tab.active {
  background-color: var(--primary-blue);
  color: #FFFFFF;
  border-color: var(--primary-blue);
  box-shadow: 0 4px 14px rgba(57, 125, 246, 0.3);
}

.tab-icon-wrap {
  display: flex;
  align-items: center;
}

/* Scenario Panels */
.tab-panels-wrap {
  position: relative;
}

.scenario-panel {
  display: block;
}

.scenario-panel[hidden] {
  display: none;
}

.scenario-card-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  background: var(--bg-main);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-paper-md);
}

.scenario-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary-blue);
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.scenario-heading {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-navy);
  margin-bottom: 16px;
  line-height: 1.35;
}

.scenario-text {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 24px;
}

.scenario-check-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.scenario-check-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9375rem;
  color: var(--text-navy);
}

.check-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 3px;
}

.scenario-graphic {
  background: var(--surface-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-paper-sm);
}

.scenario-svg {
  width: 100%;
  height: auto;
}

/* ==========================================================================
   9. PRICING / 套餐价格 (对比看板)
   ========================================================================== */
.pricing-section {
  background-color: var(--bg-main);
}

/* Desktop Comparison Board */
.pricing-board-desktop {
  margin-top: 56px;
  background: var(--surface-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-paper-lg);
  overflow: hidden;
}

.pricing-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  text-align: left;
}

.pricing-table th,
.pricing-table td {
  padding: 22px 28px;
  border-bottom: 1px solid var(--border-light);
  vertical-align: middle;
}

.pricing-table tr:last-child th,
.pricing-table tr:last-child td {
  border-bottom: none;
}

.col-metric {
  width: 18%;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-navy);
  background-color: #FAFDFE;
  border-right: 1px solid var(--border-light);
}

.metric-label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-navy);
  background-color: #FAFDFE;
  border-right: 1px solid var(--border-light);
  text-align: left;
}

.col-plan {
  width: 27.33%;
  vertical-align: top;
}

.plan-header-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.plan-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.featured-badge {
  color: var(--primary-blue);
  font-weight: 800;
}

.plan-name {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-navy);
}

.plan-brief {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Highlight Middle Column (展翼计划) */
.col-plan-featured,
.val-featured {
  background-color: #F0F6FD;
  position: relative;
}

.col-plan-featured {
  border-top: 3px solid var(--primary-blue);
}

.price-val-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.price-currency {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-navy);
}

.price-amount {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-navy);
  line-height: 1;
}

.featured-amount {
  color: var(--primary-blue);
}

.price-period {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.editable-hint {
  display: block;
  font-size: 0.6875rem;
  color: var(--text-light);
  margin-top: 4px;
}

.highlight-val {
  font-size: 1.125rem;
  color: var(--text-navy);
}

.highlight-primary {
  color: var(--primary-blue);
  font-size: 1.1875rem;
}

.val-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.875rem;
  color: var(--text-navy);
}

.val-list li::before {
  content: '• ';
  color: var(--primary-blue);
  font-weight: bold;
}

.pricing-disclaimer {
  font-size: 0.8125rem;
  color: var(--text-light);
  text-align: center;
  margin-top: 24px;
  line-height: 1.6;
}

/* Mobile Pricing Cards (Default hidden on desktop) */
.pricing-stack-mobile {
  display: none;
  flex-direction: column;
  gap: 20px;
  margin-top: 40px;
}

.mobile-plan-card {
  background: var(--surface-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-paper-sm);
  position: relative;
  overflow: hidden;
}

.mobile-plan-featured {
  border-color: var(--primary-blue);
  background: linear-gradient(180deg, #F0F6FD 0%, #FFFFFF 100%);
  box-shadow: var(--shadow-paper-lg);
}

.featured-ribbon {
  position: absolute;
  top: 14px;
  right: -30px;
  transform: rotate(45deg);
  background: var(--primary-blue);
  color: #fff;
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 4px 34px;
  box-shadow: 0 2px 6px rgba(57, 125, 246, 0.3);
}

.mobile-plan-name {
  font-size: 1.375rem;
  font-weight: 800;
  margin-top: 4px;
}

.mobile-plan-brief {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.mobile-plan-specs {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px 0;
  margin: 16px 0;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-size: 0.875rem;
}

.spec-label {
  color: var(--text-muted);
  flex-shrink: 0;
}

.spec-val {
  text-align: right;
  color: var(--text-navy);
}

/* ==========================================================================
   10. BEGINNER GUIDE / 新手指南 (起飞路径)
   ========================================================================== */
.guide-section {
  background-color: var(--surface-white);
}

.flight-path-wrap {
  position: relative;
  margin-top: 60px;
  padding: 30px 0;
}

.flight-path-svg-bg {
  position: absolute;
  top: 40px;
  left: 0;
  width: 100%;
  height: 120px;
  pointer-events: none;
  z-index: 1;
  opacity: 0.7;
}

.checkpoints-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
  z-index: 2;
}

.checkpoint-card {
  background: var(--surface-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  box-shadow: var(--shadow-paper-md);
  transition: transform 0.3s var(--ease-spring), box-shadow 0.3s var(--ease-spring);
  position: relative;
}

.checkpoint-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-paper-hover);
  border-color: #CFE3F8;
}

.checkpoint-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.checkpoint-number-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-pill);
  background: var(--pale-blue-tint);
  border: 2px solid var(--pale-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-paper-xs);
}

.checkpoint-num {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary-blue);
}

.checkpoint-bird-wrap {
  width: 60px;
  height: 45px;
  animation: birdBob 4s ease-in-out infinite alternate;
}

@keyframes birdBob {
  0% { transform: translateY(0) rotate(0deg); }
  100% { transform: translateY(-4px) rotate(2deg); }
}

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

.checkpoint-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.checkpoint-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary-blue);
  background: var(--pale-blue-tint);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
}

.guide-foot-box {
  margin-top: 48px;
  background: var(--bg-main);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 20px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.guide-foot-text strong {
  display: block;
  font-size: 0.9375rem;
  color: var(--text-navy);
  margin-bottom: 2px;
}

.guide-foot-text span {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ==========================================================================
   11. ARTICLES / 精选文章 (飞鸟手记 · 探索与沉淀)
   ========================================================================== */
.articles-section {
  background-color: var(--surface-white);
  border-top: 1px solid var(--border-light);
}

.article-filters-wrap {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 36px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}

.article-filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background-color: var(--pale-blue-tint);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-pill);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.25s var(--ease-spring);
}

.article-filter-btn:hover {
  color: var(--primary-blue);
  background-color: var(--pale-blue);
  border-color: var(--pale-blue);
}

.article-filter-btn.active {
  background-color: var(--primary-blue);
  color: #FFFFFF;
  border-color: var(--primary-blue);
  box-shadow: 0 4px 12px rgba(57, 125, 246, 0.25);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.article-card {
  background: var(--surface-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-paper-sm);
  transition: transform 0.3s var(--ease-spring), box-shadow 0.3s var(--ease-spring), border-color 0.2s ease;
  display: flex;
  flex-direction: column;
  cursor: pointer;
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-paper-hover);
  border-color: #CFE3F8;
}

.article-card.hidden {
  display: none !important;
}

.article-card-cover {
  width: 100%;
  height: 160px;
  background: var(--pale-blue-tint);
  overflow: hidden;
  border-bottom: 1px solid var(--border-light);
}

.article-cover-svg {
  width: 100%;
  height: 100%;
}

.article-card-body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.article-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.article-tag {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.04em;
}

.tag-fundamentals {
  background-color: #EBF3FF;
  color: var(--primary-blue);
}

.tag-productivity {
  background-color: var(--mint-tint);
  color: #147A60;
}

.tag-client {
  background-color: var(--sunrise-glow);
  color: #A36000;
}

.article-date {
  font-size: 0.8125rem;
  color: var(--text-light);
}

.article-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-navy);
  line-height: 1.4;
  margin-bottom: 12px;
  transition: color 0.2s ease;
}

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

.article-summary {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
  flex: 1;
}

.article-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
  gap: 12px;
}

.article-author {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 500;
}

.author-dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-pill);
  background-color: var(--primary-blue);
}

.btn-read-article {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--primary-blue);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px 0;
  transition: transform 0.2s ease;
}

.btn-read-article svg {
  transition: transform 0.2s ease;
}

.article-card:hover .btn-read-article svg {
  transform: translateX(4px);
}

/* Article Reader Modal Styling */
.article-reader-content {
  font-size: 0.9375rem;
  color: var(--text-navy);
  line-height: 1.85;
}

.article-reader-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.article-lead-quote {
  background: var(--pale-blue-tint);
  border-left: 3px solid var(--primary-blue);
  padding: 12px 18px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: 20px;
  font-style: italic;
  color: var(--text-navy);
}

.article-reader-content h4 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-navy);
  margin-top: 24px;
  margin-bottom: 10px;
}

.article-reader-content p {
  margin-bottom: 14px;
  color: #334E68;
}

.article-reader-content ul {
  padding-left: 20px;
  margin: 12px 0;
  list-style: disc;
  color: #334E68;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.article-callout {
  background: #F0FBF7;
  border: 1px solid var(--mint-accent);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin: 20px 0;
  font-size: 0.875rem;
  color: #0E5E48;
}

/* Article RSS Box */
.article-rss-box {
  margin-top: 48px;
  background: var(--bg-main);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  box-shadow: var(--shadow-paper-xs);
  flex-wrap: wrap;
}

.rss-box-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.rss-feather-icon {
  flex-shrink: 0;
}

.rss-box-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-navy);
  margin-bottom: 2px;
}

.rss-box-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ==========================================================================
   12. FAQ / 常见问题 (手风琴)
   ========================================================================== */
.faq-section {
  background-color: var(--bg-main);
}

.faq-accordion {
  max-width: 820px;
  margin: 50px auto 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--surface-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-paper-xs);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  overflow: hidden;
}

.faq-item:hover {
  border-color: #CFE3F8;
  box-shadow: var(--shadow-paper-sm);
}

.faq-header {
  margin: 0;
}

.faq-trigger {
  width: 100%;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
  cursor: pointer;
}

.faq-question {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-navy);
  line-height: 1.4;
}

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-pill);
  background: var(--pale-blue-tint);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-blue);
  flex-shrink: 0;
  transition: transform 0.25s var(--ease-spring), background 0.2s ease;
}

.faq-trigger:hover .faq-icon {
  background: var(--pale-blue);
}

.faq-trigger[aria-expanded="true"] .faq-icon {
  transform: rotate(45deg);
  background: var(--primary-blue);
  color: #FFFFFF;
}

.faq-panel {
  padding: 0 28px 24px 28px;
  animation: fadeIn 0.25s ease;
}

.faq-panel[hidden] {
  display: none;
}

.faq-body {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.75;
  border-top: 1px solid var(--border-light);
  padding-top: 16px;
}

.faq-body p {
  margin-bottom: 12px;
}

.faq-body p:last-child {
  margin-bottom: 0;
}

.faq-body ul, .faq-body ol {
  padding-left: 20px;
  margin: 8px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-body ul {
  list-style: disc;
}

.faq-body ol {
  list-style: decimal;
}

/* FAQ Support Box */
.faq-support-box {
  max-width: 820px;
  margin: 40px auto 0;
  background: var(--surface-white);
  border: 1px solid var(--pale-blue);
  border-radius: var(--radius-xl);
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  box-shadow: var(--shadow-paper-xs);
  flex-wrap: wrap;
}

.support-box-content {
  display: flex;
  align-items: center;
  gap: 16px;
}

.support-icon {
  flex-shrink: 0;
}

.support-box-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-navy);
  margin-bottom: 2px;
}

.support-box-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ==========================================================================
   12. FINAL CTA / 底部行动号召 (宽幅天空与冲云飞鸟)
   ========================================================================== */
.final-cta-section {
  position: relative;
  background: linear-gradient(180deg, #EBF5FF 0%, #DCEEFF 100%);
  padding-top: 100px;
  padding-bottom: 0;
  overflow: hidden;
}

.final-cta-sky-container {
  position: relative;
  width: 100%;
}

.final-cta-bird-wrap {
  position: absolute;
  top: -40px;
  right: 15%;
  width: 140px;
  height: 105px;
  animation: soarToEast 8s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes soarToEast {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(16px, -14px) rotate(4deg); }
}

.ascending-bird-svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 8px 16px rgba(57, 125, 246, 0.2));
}

.final-cta-content {
  position: relative;
  z-index: 5;
  padding-bottom: 90px;
}

.final-cta-headline {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--text-navy);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.final-cta-subtext {
  font-size: 1.125rem;
  color: var(--text-navy);
  opacity: 0.85;
  max-width: 580px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.final-clouds-bottom {
  position: relative;
  width: 100%;
  height: 70px;
  z-index: 3;
}

.bottom-cloud-svg {
  width: 100%;
  height: 100%;
}

/* ==========================================================================
   13. FOOTER / 页脚
   ========================================================================== */
.site-footer {
  background-color: var(--surface-white);
  border-top: 1px solid var(--border-light);
  padding: 64px 0 36px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-tagline {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--primary-blue);
}

.footer-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 280px;
}

.footer-heading {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-navy);
  letter-spacing: 0.04em;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--primary-blue);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copyright {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-legal-notice {
  font-size: 0.75rem;
  color: var(--text-light);
  max-width: 600px;
}

/* ==========================================================================
   14. MODAL DIALOG & TOAST NOTIFICATION
   ========================================================================== */
.site-modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.site-modal[hidden] {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(24, 49, 83, 0.45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: fadeIn 0.2s ease;
}

.modal-window {
  position: relative;
  width: 100%;
  max-width: 560px;
  background: var(--surface-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  box-shadow: 0 20px 48px -8px rgba(24, 49, 83, 0.2);
  overflow: hidden;
  animation: modalScaleUp 0.25s var(--ease-spring);
  z-index: 1;
}

@keyframes modalScaleUp {
  from {
    transform: scale(0.95);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: var(--pale-blue-tint);
  border-bottom: 1px solid var(--border-light);
}

.modal-title-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-navy);
}

.modal-close {
  color: var(--text-muted);
  padding: 4px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  color: var(--text-navy);
  background: var(--pale-blue);
}

.modal-body {
  padding: 24px;
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-height: 65vh;
  overflow-y: auto;
}

.modal-body h4 {
  font-size: 1rem;
  color: var(--text-navy);
  margin-top: 14px;
  margin-bottom: 6px;
}

.modal-body h4:first-child {
  margin-top: 0;
}

.modal-body p {
  margin-bottom: 12px;
}

.modal-body pre {
  background: var(--bg-main);
  padding: 12px;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--primary-blue);
  overflow-x: auto;
  border: 1px solid var(--border-light);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 16px 24px;
  border-top: 1px solid var(--border-light);
  background: var(--surface-white);
}

/* Toast Region */
.toast-region {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background: var(--text-navy);
  color: #FFFFFF;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-paper-lg);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: toastSlideIn 0.3s var(--ease-spring);
}

@keyframes toastSlideIn {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* ==========================================================================
   15. RESPONSIVE BREAKPOINTS (Desktop 1440, Tablet 768, Mobile 390)
   ========================================================================== */

/* Tablet & Smaller (<= 992px) */
@media (max-width: 992px) {
  .hero-headline {
    font-size: 2.75rem;
  }

  .quick-nav-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .quick-divider {
    display: none;
  }

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

  .scenario-card-layout {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 32px;
  }

  /* Switch Pricing from Wide Table to Mobile Stack */
  .pricing-board-desktop {
    display: none;
  }

  .pricing-stack-mobile {
    display: flex;
  }

  .checkpoints-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

  .flight-path-svg-bg {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .final-cta-bird-wrap {
    right: 5%;
    width: 100px;
    height: 75px;
  }
}

/* Mobile Devices (<= 768px) */
@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .main-nav,
  .btn-header {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .section {
    padding: 64px 0;
  }

  .hero-section {
    padding-top: 40px;
  }

  .hero-headline {
    font-size: 2.25rem;
  }

  .hero-subtext {
    font-size: 1rem;
    padding: 0 10px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    padding: 0 16px;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .section-title {
    font-size: 1.875rem;
  }

  .final-cta-headline {
    font-size: 2rem;
  }

  .feature-card-large,
  .feature-card-secondary {
    padding: 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .rhythm-stats-row {
    grid-template-columns: 1fr;
  }

  .faq-trigger {
    padding: 18px 20px;
  }

  .faq-panel {
    padding: 0 20px 20px 20px;
  }

  .faq-support-box {
    padding: 20px;
  }
}

/* Small Mobile Screens (390px iPhone & similar) */
@media (max-width: 420px) {
  .hero-headline {
    font-size: 1.95rem;
  }

  .hero-pill {
    font-size: 0.75rem;
    padding: 6px 14px;
  }

  .quick-nav-item {
    padding: 16px;
  }

  .quick-icon-box {
    width: 40px;
    height: 40px;
  }

  .scenario-card-layout {
    padding: 20px 16px;
  }

  .tab-controls-wrap {
    gap: 8px;
  }

  .scenario-tab {
    padding: 10px 16px;
    font-size: 0.875rem;
  }
}

/* ==========================================================================
   16. PREFERS-REDUCED-MOTION (Accessibility Standard)
   ========================================================================== */
@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;
  }

  .hero-swallow-glider,
  .distant-birds,
  .flight-trail-path,
  .checkpoint-bird-wrap,
  .final-cta-bird-wrap {
    animation: none !important;
  }
}