/* ====================================================================
   ERWANCDEC (尔湾云) — erwancdec.xyz
   STYLE 60 — AIRPORT WAYFINDING (国际机场导视系统)
   Design Language: Airport Signage / Swiss Wayfinding / Travel Infrastructure
   Color System:
   - Terminal Black    #171717
   - Signal Yellow     #FFD400
   - Aviation White    #F7F7F2
   - Concrete Gray     #D9D9D4
   - Information Blue  #2457D6
   - Arrival Green     #23865B
   ==================================================================== */

:root {
  --terminal-black: #171717;
  --signal-yellow: #FFD400;
  --aviation-white: #F7F7F2;
  --concrete-gray: #D9D9D4;
  --info-blue: #2457D6;
  --arrival-green: #23865B;
  --surface-white: #FFFFFF;
  --text-muted: #4A4A46;
  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --container-w: 1180px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background-color: var(--aviation-white);
  color: var(--terminal-black);
}

body {
  font-family: var(--font-stack);
  background-color: var(--aviation-white);
  color: var(--terminal-black);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--terminal-black);
  text-decoration: none;
  transition: color 0.18s ease, background-color 0.18s ease;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--info-blue);
  outline-offset: 2px;
}

ul, ol {
  list-style: none;
}

svg {
  vertical-align: middle;
  flex-shrink: 0;
}

/* ====================================================================
   WAYFINDING TOP ROUTE PROGRESS BAR (顶部航线进度条)
   ==================================================================== */

.pp-waybar {
  background-color: var(--terminal-black);
  color: var(--aviation-white);
  border-bottom: 2px solid var(--signal-yellow);
  font-size: 0.8125rem;
  font-weight: 600;
}

.pp-waybar__inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 8px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.pp-waybar__route {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  white-space: nowrap;
}

.pp-waybar__step {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  color: var(--concrete-gray);
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.pp-waybar__step.is-active {
  background-color: var(--signal-yellow);
  color: var(--terminal-black);
  font-weight: 700;
}

.pp-waybar__step.is-passed {
  color: var(--signal-yellow);
}

.pp-waybar__sep {
  color: var(--concrete-gray);
  font-weight: 700;
}

.pp-waybar__next {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--signal-yellow);
  font-size: 0.75rem;
}

/* ====================================================================
   HEADER & STICKY NAVIGATION
   ==================================================================== */

.pp-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(247, 247, 242, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--terminal-black);
}

.pp-header__inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 20px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.pp-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--terminal-black);
  letter-spacing: -0.02em;
}

.pp-brand__gate {
  background-color: var(--signal-yellow);
  color: var(--terminal-black);
  padding: 2px 8px;
  border: 2px solid var(--terminal-black);
  font-size: 0.875rem;
  font-weight: 800;
}

.pp-nav {
  display: none;
}

@media (min-width: 860px) {
  .pp-nav {
    display: flex;
    align-items: center;
    gap: 6px;
  }
}

.pp-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--terminal-black);
  border: 2px solid transparent;
}

.pp-nav__num {
  background-color: var(--concrete-gray);
  color: var(--terminal-black);
  padding: 1px 5px;
  font-size: 0.75rem;
  font-weight: 800;
}

.pp-nav__link:hover,
.pp-nav__link.is-current {
  border-color: var(--terminal-black);
  background-color: var(--surface-white);
}

.pp-nav__link:hover .pp-nav__num,
.pp-nav__link.is-current .pp-nav__num {
  background-color: var(--signal-yellow);
}

.pp-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.pp-menu-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background-color: var(--terminal-black);
  color: var(--signal-yellow);
  border: 2px solid var(--terminal-black);
  cursor: pointer;
}

@media (min-width: 860px) {
  .pp-menu-toggle {
    display: none;
  }
}

.pp-menu-toggle__line {
  width: 20px;
  height: 2px;
  background-color: var(--signal-yellow);
}

/* Fullscreen / High-Clarity Mobile Menu */
.pp-mobile-nav {
  display: none;
  background-color: var(--terminal-black);
  color: var(--aviation-white);
  border-bottom: 4px solid var(--signal-yellow);
  padding: 24px 20px 32px;
}

.pp-mobile-nav.is-open {
  display: block;
}

.pp-mobile-nav__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.pp-mobile-nav__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background-color: #222222;
  color: var(--aviation-white);
  border-left: 4px solid var(--signal-yellow);
  font-size: 1.0625rem;
  font-weight: 700;
}

/* ====================================================================
   DIRECTIONAL CTA BUTTONS (高度 56px，左向右黄色填充 + 扫描线 + 6px 箭头位移)
   ==================================================================== */

.pp-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 56px;
  padding: 0 28px;
  font-size: 1rem;
  font-weight: 800;
  background-color: var(--terminal-black);
  color: var(--signal-yellow);
  border: 2px solid var(--terminal-black);
  cursor: pointer;
  overflow: hidden;
  z-index: 1;
  transition: color 0.22s ease, transform 0.12s ease;
  white-space: nowrap;
}

.pp-btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--signal-yellow);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: -1;
}

.pp-btn::after {
  content: "";
  position: absolute;
  top: 0;
  left: -20%;
  width: 8px;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.65);
  transition: left 0.22s ease;
  z-index: -1;
}

.pp-btn:hover {
  color: var(--terminal-black);
}

.pp-btn:hover::before {
  transform: scaleX(1);
}

.pp-btn:hover::after {
  left: 110%;
}

.pp-btn__arrow {
  transition: transform 0.22s ease;
}

.pp-btn:hover .pp-btn__arrow {
  transform: translateX(6px);
}

.pp-btn:active {
  transform: translateY(2px);
}

.pp-btn--sm {
  height: 44px;
  padding: 0 18px;
  font-size: 0.9375rem;
}

.pp-btn--secondary {
  background-color: var(--surface-white);
  color: var(--terminal-black);
  border: 2px solid var(--terminal-black);
}

.pp-btn--secondary::before {
  background-color: var(--info-blue);
}

.pp-btn--secondary:hover {
  color: var(--surface-white);
}

.pp-btn--yellow {
  background-color: var(--signal-yellow);
  color: var(--terminal-black);
}

.pp-btn--yellow::before {
  background-color: var(--aviation-white);
}

.pp-btn--block {
  width: 100%;
}

/* ====================================================================
   GRID & SECTIONS
   ==================================================================== */

.pp-container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 20px;
}

.pp-section {
  padding: 64px 0;
  border-bottom: 2px solid var(--terminal-black);
}

@media (min-width: 768px) {
  .pp-section {
    padding: 84px 0;
  }
}

.pp-section--surface {
  background-color: var(--surface-white);
}

.pp-section--dark {
  background-color: var(--terminal-black);
  color: var(--aviation-white);
}

.pp-section-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 44px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--concrete-gray);
}

@media (min-width: 768px) {
  .pp-section-head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }
}

.pp-section-head__left {
  max-width: 680px;
}

.pp-way-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--terminal-black);
  color: var(--signal-yellow);
  font-size: 0.8125rem;
  font-weight: 800;
  padding: 4px 12px;
  margin-bottom: 12px;
}

.pp-way-badge--blue {
  background-color: var(--info-blue);
  color: var(--surface-white);
}

.pp-section-head__title {
  font-size: 1.875rem;
  font-weight: 900;
  line-height: 1.25;
  color: var(--terminal-black);
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  .pp-section-head__title {
    font-size: 2.25rem;
  }
}

.pp-section-head__desc {
  font-size: 1rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.pp-section-head__meta {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--info-blue);
  background-color: var(--surface-white);
  border: 2px solid var(--terminal-black);
  padding: 6px 12px;
  white-space: nowrap;
}

/* ====================================================================
   HERO SECTION + DEPARTURE BOARD (航班信息屏)
   ==================================================================== */

.pp-hero {
  background-color: var(--aviation-white);
  border-bottom: 3px solid var(--terminal-black);
  padding-top: 40px;
}

.pp-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding-bottom: 48px;
  align-items: center;
}

@media (min-width: 960px) {
  .pp-hero__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
  }
}

.pp-hero__sign {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: var(--surface-white);
  border: 2px solid var(--terminal-black);
  padding: 6px 14px;
  font-size: 0.8125rem;
  font-weight: 800;
  margin-bottom: 20px;
}

.pp-status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--arrival-green);
  display: inline-block;
}

.pp-hero__title {
  font-size: 2.375rem;
  font-weight: 900;
  line-height: 1.18;
  color: var(--terminal-black);
  margin-bottom: 20px;
  letter-spacing: -0.025em;
}

@media (min-width: 768px) {
  .pp-hero__title {
    font-size: 3.125rem;
  }
}

.pp-hero__subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 32px;
  max-width: 580px;
}

.pp-hero__actions {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 28px;
}

@media (min-width: 540px) {
  .pp-hero__actions {
    flex-direction: row;
    align-items: center;
  }
}

.pp-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 20px;
  border-top: 2px solid var(--concrete-gray);
  font-size: 0.875rem;
  font-weight: 700;
}

.pp-hero__fact {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Airport Flight Information Display System (FIDS) */
.pp-board {
  background-color: var(--terminal-black);
  color: var(--aviation-white);
  border: 3px solid var(--terminal-black);
  box-shadow: 8px 8px 0 var(--concrete-gray);
}

.pp-board__top {
  background-color: var(--signal-yellow);
  color: var(--terminal-black);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 900;
  font-size: 0.9375rem;
  border-bottom: 2px solid var(--terminal-black);
}

.pp-board__table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.pp-board__table th {
  text-align: left;
  padding: 10px 16px;
  color: var(--concrete-gray);
  border-bottom: 1px solid #333333;
  font-size: 0.75rem;
  font-weight: 700;
}

.pp-board__table td {
  padding: 12px 16px;
  border-bottom: 1px solid #2A2A2A;
  font-weight: 700;
}

.pp-board__gate {
  color: var(--signal-yellow);
  font-family: monospace;
  font-size: 0.9375rem;
}

.pp-board__status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: rgba(35, 134, 91, 0.22);
  color: #4ADE80;
  padding: 2px 8px;
  font-size: 0.75rem;
  border: 1px solid var(--arrival-green);
}

.pp-board__footer {
  padding: 12px 16px;
  background-color: #222222;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--concrete-gray);
}

/* Hero Bottom Horizontal Information Bar */
.pp-horiz-bar {
  background-color: var(--terminal-black);
  color: var(--aviation-white);
  border-top: 2px solid var(--terminal-black);
}

.pp-horiz-bar__grid {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .pp-horiz-bar__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pp-horiz-bar__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  color: var(--aviation-white);
  border-bottom: 1px solid #333333;
}

@media (min-width: 768px) {
  .pp-horiz-bar__item {
    border-bottom: none;
    border-right: 1px solid #333333;
  }
  .pp-horiz-bar__item:last-child {
    border-right: none;
  }
}

.pp-horiz-bar__item:hover {
  background-color: #222222;
  color: var(--signal-yellow);
}

.pp-horiz-bar__num {
  background-color: var(--signal-yellow);
  color: var(--terminal-black);
  padding: 2px 8px;
  font-weight: 900;
  font-size: 0.875rem;
  margin-right: 10px;
}

/* ====================================================================
   DESTINATION PANELS (CARDS: 编号 + 标题 + 一句话说明 + 关键指标 + 行动链接)
   ==================================================================== */

.pp-dest-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .pp-dest-grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
  .pp-dest-grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1080px) {
  .pp-dest-grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.pp-dest-card {
  background-color: var(--surface-white);
  border: 2px solid var(--terminal-black);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.pp-dest-card:hover {
  transform: translateY(-3px);
  box-shadow: 6px 6px 0 var(--terminal-black);
}

.pp-dest-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--concrete-gray);
}

.pp-dest-card__num {
  background-color: var(--terminal-black);
  color: var(--signal-yellow);
  font-size: 0.875rem;
  font-weight: 900;
  padding: 4px 10px;
}

.pp-dest-card__metric {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--info-blue);
  background-color: var(--aviation-white);
  padding: 3px 8px;
  border: 1px solid var(--concrete-gray);
}

.pp-dest-card__title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--terminal-black);
}

.pp-dest-card__desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  flex-grow: 1;
}

.pp-dest-card__foot {
  padding-top: 14px;
  border-top: 1px solid var(--concrete-gray);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  font-weight: 800;
}

.pp-dest-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--info-blue);
}

.pp-dest-card__link:hover {
  color: var(--terminal-black);
}

/* ====================================================================
   STREAMING & AI TERMINALS
   ==================================================================== */

.pp-terminal-duo {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

@media (min-width: 860px) {
  .pp-terminal-duo {
    grid-template-columns: 1fr 1fr;
  }
}

.pp-terminal-box {
  background-color: var(--surface-white);
  border: 2px solid var(--terminal-black);
  padding: 28px;
}

.pp-terminal-box__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--terminal-black);
}

.pp-terminal-box__title {
  font-size: 1.3125rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pp-gate-matrix {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-top: 20px;
}

@media (min-width: 480px) {
  .pp-gate-matrix {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pp-gate-item {
  border: 2px solid var(--terminal-black);
  background-color: var(--aviation-white);
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  font-weight: 800;
}

.pp-gate-item__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--arrival-green);
}

/* ====================================================================
   PRICING CLASSES (经济舱 / 商务舱【推荐航线】 / 头等舱)
   ==================================================================== */

.pp-class-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: stretch;
}

@media (min-width: 900px) {
  .pp-class-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pp-ticket {
  background-color: var(--surface-white);
  border: 2px solid var(--terminal-black);
  display: flex;
  flex-direction: column;
  position: relative;
}

.pp-ticket--recommended {
  border-width: 3px;
  box-shadow: 8px 8px 0 var(--terminal-black);
}

.pp-ticket__ribbon {
  background-color: var(--signal-yellow);
  color: var(--terminal-black);
  font-size: 0.8125rem;
  font-weight: 900;
  padding: 8px 16px;
  border-bottom: 2px solid var(--terminal-black);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.pp-ticket__head {
  padding: 24px 24px 18px;
  border-bottom: 2px dashed var(--concrete-gray);
}

.pp-ticket__cabin {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--info-blue);
  margin-bottom: 6px;
}

.pp-ticket__name {
  font-size: 1.375rem;
  font-weight: 900;
  margin-bottom: 12px;
}

.pp-ticket__price {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.pp-ticket__amount {
  font-size: 2.375rem;
  font-weight: 900;
  line-height: 1;
}

.pp-ticket__unit {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 700;
}

.pp-ticket__body {
  padding: 24px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.pp-ticket__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.pp-ticket__item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9375rem;
  font-weight: 600;
}

/* ====================================================================
   FAQ ACCORDION
   ==================================================================== */

.pp-faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.pp-faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.pp-faq-item {
  background-color: var(--surface-white);
  border: 2px solid var(--terminal-black);
}

.pp-faq-question {
  width: 100%;
  min-height: 56px;
  padding: 16px 20px;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: inherit;
  font-size: 1.0625rem;
  font-weight: 800;
  color: var(--terminal-black);
  text-align: left;
  cursor: pointer;
}

.pp-faq-item.is-open .pp-faq-question {
  background-color: var(--signal-yellow);
  border-bottom: 2px solid var(--terminal-black);
}

.pp-faq-answer {
  display: none;
  padding: 20px;
  font-size: 0.9375rem;
  color: var(--terminal-black);
  line-height: 1.7;
}

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

/* ====================================================================
   FINAL CTA & FOOTER
   ==================================================================== */

.pp-final-cta {
  background-color: var(--terminal-black);
  color: var(--aviation-white);
  padding: 72px 0;
  border-bottom: 4px solid var(--signal-yellow);
  text-align: center;
}

.pp-final-cta__code {
  display: inline-block;
  background-color: var(--signal-yellow);
  color: var(--terminal-black);
  font-weight: 900;
  font-size: 0.8125rem;
  padding: 4px 12px;
  margin-bottom: 16px;
}

.pp-final-cta__title {
  font-size: 2rem;
  font-weight: 900;
  margin-bottom: 14px;
}

@media (min-width: 768px) {
  .pp-final-cta__title {
    font-size: 2.5rem;
  }
}

.pp-final-cta__desc {
  color: var(--concrete-gray);
  max-width: 600px;
  margin: 0 auto 32px;
}

.pp-footer {
  background-color: var(--terminal-black);
  color: var(--concrete-gray);
  padding: 48px 0 96px;
  font-size: 0.875rem;
}

@media (min-width: 768px) {
  .pp-footer {
    padding: 48px 0;
  }
}

.pp-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.pp-footer__top {
  display: flex;
  flex-direction: column;
  gap: 20px;
  justify-content: space-between;
  padding-bottom: 24px;
  border-bottom: 1px solid #333333;
}

@media (min-width: 768px) {
  .pp-footer__top {
    flex-direction: row;
    align-items: center;
  }
}

.pp-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.pp-footer__link {
  color: var(--aviation-white);
  font-weight: 700;
}

.pp-footer__link:hover {
  color: var(--signal-yellow);
}

.pp-footer__bottom {
  display: flex;
  flex-direction: column;
  gap: 10px;
  justify-content: space-between;
  font-size: 0.8125rem;
}

@media (min-width: 768px) {
  .pp-footer__bottom {
    flex-direction: row;
  }
}

/* ====================================================================
   MOBILE STICKY BAR (滚动超过首屏后显示，不遮挡 Footer)
   ==================================================================== */

.pp-mobile-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 90;
  background-color: var(--terminal-black);
  border-top: 3px solid var(--signal-yellow);
  padding: 10px 16px;
  transform: translateY(100%);
  transition: transform 0.25s ease;
}

.pp-mobile-bar.is-visible {
  transform: translateY(0);
}

@media (min-width: 768px) {
  .pp-mobile-bar {
    display: none;
  }
}

.pp-mobile-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.pp-mobile-bar__info {
  color: var(--aviation-white);
  font-size: 0.8125rem;
  font-weight: 700;
}

/* ====================================================================
   ARTICLE & GUIDE PAGES
   ==================================================================== */

.pp-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 24px;
  padding: 10px 16px;
  background-color: var(--surface-white);
  border: 2px solid var(--terminal-black);
}

.pp-article-shell {
  padding: 40px 0 80px;
}

.pp-article-card {
  max-width: 860px;
  margin: 0 auto;
  background-color: var(--surface-white);
  border: 2px solid var(--terminal-black);
  padding: 28px 20px;
}

@media (min-width: 768px) {
  .pp-article-card {
    padding: 48px;
  }
}

.pp-article-header {
  padding-bottom: 24px;
  margin-bottom: 28px;
  border-bottom: 2px solid var(--terminal-black);
}

.pp-article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--info-blue);
  margin-bottom: 12px;
}

.pp-article-title {
  font-size: 1.75rem;
  font-weight: 900;
  line-height: 1.3;
}

@media (min-width: 768px) {
  .pp-article-title {
    font-size: 2.25rem;
  }
}

.pp-content h2 {
  font-size: 1.375rem;
  font-weight: 900;
  margin: 36px 0 14px;
  padding: 8px 14px;
  background-color: var(--aviation-white);
  border-left: 6px solid var(--signal-yellow);
  border-top: 1px solid var(--concrete-gray);
  border-right: 1px solid var(--concrete-gray);
  border-bottom: 1px solid var(--concrete-gray);
}

.pp-content h3 {
  font-size: 1.125rem;
  font-weight: 800;
  margin: 24px 0 10px;
}

.pp-content p {
  margin-bottom: 18px;
  font-size: 1rem;
  line-height: 1.8;
}

.pp-content ul,
.pp-content ol {
  margin: 0 0 20px 24px;
}

.pp-content ul {
  list-style: square;
}

.pp-content ol {
  list-style: decimal;
}

.pp-content li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.pp-content a {
  color: var(--info-blue);
  font-weight: 700;
  text-decoration: underline;
}

.pp-article-cta-box {
  margin: 40px 0;
  padding: 28px;
  background-color: var(--terminal-black);
  color: var(--aviation-white);
  border-left: 8px solid var(--signal-yellow);
}

.pp-article-cta-box__title {
  font-size: 1.375rem;
  font-weight: 900;
  color: var(--signal-yellow);
  margin-bottom: 8px;
}

.pp-article-cta-box__desc {
  color: var(--concrete-gray);
  margin-bottom: 20px;
}

.pp-related-links {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 2px solid var(--terminal-black);
}

.pp-related-links__title {
  font-size: 1.125rem;
  font-weight: 900;
  margin-bottom: 14px;
}

.pp-related-links__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.pp-related-links__list a {
  display: block;
  padding: 12px 16px;
  background-color: var(--aviation-white);
  border: 2px solid var(--terminal-black);
  font-weight: 700;
}

.pp-related-links__list a:hover {
  background-color: var(--signal-yellow);
}

.pp-guide-thumb {
  width: 100%;
  height: auto;
  display: block;
  margin-bottom: 16px;
  border: 2px solid var(--terminal-black);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}