/* ==========================================================================
   飞鸟 (Feiniao) 官方落地页 - 贴纸艺术风格样式表
   Design: Neo-brutalist Sticker-Art (Warm Cream, Dark Borders, Offset Shadows)
   Palette: Cream #FFF9F0 | Dark #202033 | Pink #FF77AC | Turquoise #50C9C1 | Yellow #FFDF51 | Lavender #A994F6
   ========================================================================== */

:root {
  /* 调色盘规范 */
  --bg-cream: #FFF9F0;
  --bg-white: #FFFFFF;
  --dark-ink: #202033;
  --dark-ink-soft: #383854;
  --text-muted: #5E5E7A;
  
  --color-pink: #FF77AC;
  --color-pink-hover: #ff5996;
  --color-pink-soft: #FFE5EE;
  
  --color-turquoise: #50C9C1;
  --color-turquoise-hover: #3bbcb3;
  --color-turquoise-soft: #E1F8F6;
  
  --color-yellow: #FFDF51;
  --color-yellow-hover: #fed329;
  --color-yellow-soft: #FFF9D2;
  
  --color-lavender: #A994F6;
  --color-lavender-hover: #937bf3;
  --color-lavender-soft: #F1EDFD;

  /* 边框与阴影规范 (Sticker Hard Shadow) */
  --border-thick: 3px solid var(--dark-ink);
  --border-medium: 2.5px solid var(--dark-ink);
  --border-thin: 2px solid var(--dark-ink);
  
  --shadow-sm: 3px 3px 0 var(--dark-ink);
  --shadow-md: 5px 5px 0 var(--dark-ink);
  --shadow-lg: 8px 8px 0 var(--dark-ink);
  --shadow-hover: 7px 7px 0 var(--dark-ink);
  --shadow-active: 1px 1px 0 var(--dark-ink);

  /* 圆角规范 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* 布局与字体 */
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --max-width: 1200px;
  --header-height: 80px;
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-cream);
  /* 细腻波点背景纹理 */
  background-image: radial-gradient(var(--dark-ink) 1.25px, transparent 1.25px);
  background-size: 26px 26px;
  background-position: 0 0;
  color: var(--dark-ink);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 选区与焦点无障碍 */
::selection {
  background-color: var(--color-yellow);
  color: var(--dark-ink);
}

:focus-visible {
  outline: 3px dashed var(--color-pink);
  outline-offset: 4px;
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

/* 通用容器与栅格 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.section {
  padding: 80px 0;
  position: relative;
}

@media (max-width: 768px) {
  .section {
    padding: 56px 0;
  }
}

/* 贴纸徽章与标头组件 */
.section-header {
  text-align: center;
  margin-bottom: 52px;
  position: relative;
}

.sticker-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  border-radius: var(--radius-full);
  border: var(--border-medium);
  box-shadow: var(--shadow-sm);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.sticker-badge.turquoise {
  background-color: var(--color-turquoise);
  color: var(--dark-ink);
}

.sticker-badge.yellow {
  background-color: var(--color-yellow);
  color: var(--dark-ink);
}

.sticker-badge.pink {
  background-color: var(--color-pink);
  color: var(--dark-ink);
}

.sticker-badge.lavender {
  background-color: var(--color-lavender);
  color: var(--dark-ink);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 900;
  color: var(--dark-ink);
  line-height: 1.25;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 660px;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .section-title {
    font-size: 1.85rem;
  }
  .section-subtitle {
    font-size: 1rem;
  }
}

/* 贴纸按钮标准组件 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  font-size: 1rem;
  font-weight: 800;
  border-radius: var(--radius-full);
  border: var(--border-thick);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: var(--shadow-active);
}

.btn-primary-pink {
  background-color: var(--color-pink);
  color: var(--dark-ink);
}

.btn-primary-pink:hover {
  background-color: var(--color-pink-hover);
}

.btn-secondary-white {
  background-color: var(--bg-white);
  color: var(--dark-ink);
}

.btn-secondary-white:hover {
  background-color: var(--color-yellow-soft);
}

.btn-turquoise {
  background-color: var(--color-turquoise);
  color: var(--dark-ink);
}

.btn-turquoise:hover {
  background-color: var(--color-turquoise-hover);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.9rem;
  box-shadow: var(--shadow-sm);
}

/* ==========================================================================
   1. HEADER & NAVBAR
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 249, 240, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: var(--border-thick);
  transition: all var(--transition-normal);
}

.site-header.scrolled {
  background-color: var(--bg-cream);
  box-shadow: 0 4px 0 var(--dark-ink);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

/* Logo 标识 */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-badge {
  width: 46px;
  height: 46px;
  background-color: var(--color-pink);
  border: var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
}

.brand-logo:hover .logo-badge {
  transform: rotate(-6deg) scale(1.05);
}

.logo-text-group {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.55rem;
  font-weight: 900;
  color: var(--dark-ink);
  line-height: 1.1;
  letter-spacing: -0.5px;
}

.brand-tagline {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

/* 导航菜单 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--dark-ink);
  position: relative;
  padding: 6px 4px;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background-color: var(--color-pink);
  transition: width var(--transition-fast);
  border-radius: 2px;
}

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

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

.nav-cta {
  display: flex;
  align-items: center;
}

/* 移动端汉堡切换按钮 */
.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  background-color: var(--bg-white);
  border: var(--border-medium);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 1001;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 3px;
  background-color: var(--dark-ink);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.menu-toggle.open span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.menu-toggle.open span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.open span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* 移动端抽屉菜单 */
.mobile-drawer {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  background-color: var(--bg-cream);
  border-bottom: var(--border-thick);
  box-shadow: 0 10px 0 var(--dark-ink);
  padding: 24px 20px 32px;
  z-index: 999;
  flex-direction: column;
  gap: 20px;
}

.mobile-drawer.active {
  display: flex;
  animation: slideDown 0.25s ease-out forwards;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mobile-nav-link {
  display: block;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--dark-ink);
  padding: 8px 12px;
  background-color: var(--bg-white);
  border: var(--border-thin);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 992px) {
  .nav-menu, .nav-cta {
    display: none;
  }
  .menu-toggle {
    display: flex;
  }
}

/* ==========================================================================
   2. HERO SECTION
   ========================================================================== */
.hero-section {
  padding: 50px 0 70px;
  overflow: hidden;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.hero-left {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  z-index: 2;
}

.announcement-badge {
  transform: rotate(-1.5deg);
  margin-bottom: 20px;
  transition: transform var(--transition-fast);
}

.announcement-badge:hover {
  transform: rotate(0deg) scale(1.02);
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1px;
  color: var(--dark-ink);
  margin-bottom: 16px;
}

.highlight-pink {
  color: var(--color-pink);
  text-shadow: 2px 2px 0 var(--dark-ink);
  position: relative;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--dark-ink-soft);
  margin-bottom: 24px;
  line-height: 1.5;
}

/* Hero 介绍卡片 */
.intro-card {
  background-color: var(--bg-white);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 24px;
  margin-bottom: 28px;
  position: relative;
  width: 100%;
}

.intro-badge-label {
  position: absolute;
  top: -14px;
  left: 20px;
  background-color: var(--color-yellow);
  color: var(--dark-ink);
  font-size: 0.82rem;
  font-weight: 900;
  padding: 3px 14px;
  border: var(--border-medium);
  border-radius: var(--radius-full);
  box-shadow: 2px 2px 0 var(--dark-ink);
  transform: rotate(-1deg);
}

.intro-text {
  font-size: 1rem;
  color: var(--dark-ink-soft);
  margin-bottom: 16px;
  margin-top: 6px;
  line-height: 1.65;
}

.intro-features {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pill-feature {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.84rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: var(--border-thin);
  background-color: var(--color-turquoise-soft);
  color: var(--dark-ink);
}

.pill-feature.pink-tint {
  background-color: var(--color-pink-soft);
}

.pill-feature.lavender-tint {
  background-color: var(--color-lavender-soft);
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 22px;
}

.hero-footprints {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
}

.footprint-icon {
  width: 16px;
  height: 16px;
  fill: var(--text-muted);
  opacity: 0.7;
}

/* Hero 右侧吉祥物展台 */
.hero-right {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 480px;
}

.flight-orbit-wrapper {
  position: relative;
  width: 100%;
  max-width: 440px;
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.dotted-orbit-svg {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  animation: rotateOrbit 40s linear infinite;
  pointer-events: none;
}

.mascot-svg-container {
  width: 320px;
  height: 320px;
  position: relative;
  z-index: 2;
  animation: floatMascot 4s ease-in-out infinite;
  transform-origin: center center;
  filter: drop-shadow(6px 10px 0 rgba(32, 32, 51, 0.95));
}

/* 漂浮贴纸元素 */
.sticker-float {
  position: absolute;
  background-color: var(--bg-white);
  border: var(--border-medium);
  border-radius: var(--radius-full);
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 900;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 6px;
  z-index: 3;
  pointer-events: none;
}

.sticker-float.sticker-speed {
  top: 15px;
  right: -10px;
  background-color: var(--color-yellow);
  transform: rotate(6deg);
  animation: floatStickerA 3.5s ease-in-out infinite alternate;
}

.sticker-float.sticker-stable {
  bottom: 30px;
  left: -20px;
  background-color: var(--color-turquoise);
  transform: rotate(-6deg);
  animation: floatStickerB 4.2s ease-in-out infinite alternate;
}

.sticker-float.sticker-feather {
  top: 60%;
  right: -25px;
  background-color: var(--color-lavender);
  transform: rotate(8deg);
  animation: floatStickerA 3.8s ease-in-out infinite alternate;
}

/* 动效与减弱动效偏好 */
@keyframes floatMascot {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-14px) rotate(2.5deg);
  }
}

@keyframes rotateOrbit {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes floatStickerA {
  0% { transform: translateY(0px) rotate(6deg); }
  100% { transform: translateY(-10px) rotate(9deg); }
}

@keyframes floatStickerB {
  0% { transform: translateY(0px) rotate(-6deg); }
  100% { transform: translateY(-12px) rotate(-3deg); }
}

@media (prefers-reduced-motion: reduce) {
  .mascot-svg-container,
  .dotted-orbit-svg,
  .sticker-float {
    animation: none !important;
  }
}

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-left {
    align-items: center;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-title {
    font-size: 2.6rem;
  }
  .hero-right {
    min-height: 380px;
  }
  .mascot-svg-container {
    width: 260px;
    height: 260px;
  }
}

@media (max-width: 576px) {
  .hero-title {
    font-size: 2.05rem;
  }
  .hero-subtitle {
    font-size: 1.1rem;
  }
  .hero-cta-group {
    width: 100%;
    flex-direction: column;
  }
  .hero-cta-group .btn {
    width: 100%;
  }
}

/* ==========================================================================
   3. HIGHLIGHTS STRIP (全宽核心特性条)
   ========================================================================== */
.highlights-section {
  padding: 20px 0 50px;
}

.highlights-panel {
  background-color: var(--bg-white);
  border: var(--border-thick);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 40px 32px;
}

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.highlight-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  position: relative;
}

.highlight-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -14px;
  top: 15%;
  height: 70%;
  width: 2px;
  background-color: rgba(32, 32, 51, 0.12);
}

.highlight-tag {
  display: inline-flex;
  align-items: center;
  font-size: 0.82rem;
  font-weight: 900;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: var(--border-thin);
  box-shadow: 2px 2px 0 var(--dark-ink);
  margin-bottom: 12px;
}

.highlight-item:nth-child(1) .highlight-tag {
  background-color: var(--color-turquoise);
}
.highlight-item:nth-child(2) .highlight-tag {
  background-color: var(--color-yellow);
}
.highlight-item:nth-child(3) .highlight-tag {
  background-color: var(--color-pink);
}
.highlight-item:nth-child(4) .highlight-tag {
  background-color: var(--color-lavender);
}

.highlight-heading {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--dark-ink);
  margin-bottom: 8px;
}

.highlight-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.55;
}

@media (max-width: 992px) {
  .highlights-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
  .highlight-item:not(:last-child)::after {
    display: none;
  }
}

@media (max-width: 576px) {
  .highlights-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .highlights-panel {
    padding: 28px 20px;
  }
}

/* ==========================================================================
   4. CORE ADVANTAGES (核心优势 3大卡片)
   ========================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.advantage-card {
  background-color: var(--bg-white);
  border: var(--border-thick);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.advantage-card:hover {
  transform: translateY(-6px);
  box-shadow: 9px 9px 0 var(--dark-ink);
}

.card-art-box {
  width: 100%;
  height: 180px;
  border: var(--border-medium);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  position: relative;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-feather .card-art-box {
  background-color: var(--color-turquoise-soft);
}

.card-wings .card-art-box {
  background-color: var(--color-lavender-soft);
}

.card-nest .card-art-box {
  background-color: var(--color-pink-soft);
}

.card-art-svg {
  width: 140px;
  height: 140px;
}

.card-badge-topic {
  display: inline-flex;
  font-size: 0.82rem;
  font-weight: 900;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: var(--border-thin);
  margin-bottom: 12px;
  align-self: flex-start;
}

.card-feather .card-badge-topic {
  background-color: var(--color-turquoise);
}

.card-wings .card-badge-topic {
  background-color: var(--color-lavender);
}

.card-nest .card-badge-topic {
  background-color: var(--color-pink);
}

.advantage-card-title {
  font-size: 1.45rem;
  font-weight: 900;
  color: var(--dark-ink);
  margin-bottom: 12px;
}

.advantage-card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.advantage-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 14px;
  border-top: 2px dashed rgba(32, 32, 51, 0.15);
}

.advantage-pill {
  font-size: 0.78rem;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--dark-ink);
  background-color: var(--bg-cream);
}

@media (max-width: 992px) {
  .advantages-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

/* ==========================================================================
   5. STREAMING & AI SCENARIOS (流媒体与AI场景)
   ========================================================================== */
.scenarios-container {
  background-color: var(--bg-white);
  border: var(--border-thick);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 44px;
}

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 32px;
}

.scenario-category-card {
  border: var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
  background-color: var(--bg-cream);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast);
}

.scenario-category-card:hover {
  transform: translateY(-4px);
}

.scenario-header-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.scenario-icon-badge {
  width: 44px;
  height: 44px;
  border: var(--border-medium);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 2px 2px 0 var(--dark-ink);
  flex-shrink: 0;
}

.badge-ai {
  background-color: var(--color-lavender);
}

.badge-stream {
  background-color: var(--color-pink);
}

.badge-work {
  background-color: var(--color-turquoise);
}

.scenario-cat-title {
  font-size: 1.22rem;
  font-weight: 900;
  color: var(--dark-ink);
}

.scenario-cat-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 18px;
}

.scenario-tags-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.app-sticker {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 11px;
  font-size: 0.8rem;
  font-weight: 800;
  background-color: var(--bg-white);
  border: var(--border-thin);
  border-radius: var(--radius-sm);
  box-shadow: 2px 2px 0 var(--dark-ink);
}

/* 免责声明提示框 */
.disclaimer-banner {
  background-color: var(--color-yellow-soft);
  border: var(--border-medium);
  border-radius: var(--radius-md);
  padding: 18px 24px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  box-shadow: var(--shadow-sm);
}

.disclaimer-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  margin-top: 2px;
}

.disclaimer-title {
  font-size: 0.96rem;
  font-weight: 900;
  color: var(--dark-ink);
  margin-bottom: 4px;
}

.disclaimer-text {
  font-size: 0.88rem;
  color: var(--dark-ink-soft);
  line-height: 1.5;
}

@media (max-width: 992px) {
  .scenarios-grid {
    grid-template-columns: 1fr;
  }
  .scenarios-container {
    padding: 28px 20px;
  }
}

/* ==========================================================================
   6. BEGINNER GUIDE (新手三步指南 - 黄色插画风格面板)
   ========================================================================== */
.guide-panel {
  background-color: var(--color-yellow);
  border: var(--border-thick);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 52px 40px;
  position: relative;
  overflow: hidden;
}

.guide-panel .section-title {
  color: var(--dark-ink);
}

.steps-flight-container {
  position: relative;
  margin-top: 40px;
}

/* 步序卡片网格 */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
  z-index: 2;
}

.step-card {
  background-color: var(--bg-white);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 30px 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  position: relative;
  transition: transform var(--transition-fast);
}

.step-card:hover {
  transform: translateY(-4px);
}

.step-number-tag {
  position: absolute;
  top: -16px;
  left: 20px;
  width: 36px;
  height: 36px;
  background-color: var(--color-pink);
  border: var(--border-medium);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--dark-ink);
  box-shadow: 2px 2px 0 var(--dark-ink);
}

.step-icon-wrap {
  width: 52px;
  height: 52px;
  background-color: var(--bg-cream);
  border: var(--border-thin);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  margin-top: 8px;
}

.step-title {
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--dark-ink);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.94rem;
  color: var(--dark-ink-soft);
  line-height: 1.55;
  margin-bottom: 16px;
}

.step-badge-hint {
  font-size: 0.8rem;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  border: var(--border-thin);
  background-color: var(--color-turquoise-soft);
  margin-top: auto;
}

/* 飞行连接虚线与小鸟 Mascot */
.flight-path-svg-guide {
  position: absolute;
  top: 35%;
  left: 10%;
  width: 80%;
  height: 80px;
  z-index: 1;
  pointer-events: none;
}

.flying-guide-bird {
  position: absolute;
  top: -24px;
  left: 48%;
  transform: translateX(-50%);
  animation: birdHover 3s ease-in-out infinite;
  z-index: 3;
}

@keyframes birdHover {
  0%, 100% {
    transform: translate(-50%, 0) rotate(-2deg);
  }
  50% {
    transform: translate(-50%, -10px) rotate(4deg);
  }
}

@media (max-width: 992px) {
  .steps-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .flight-path-svg-guide {
    display: none;
  }
  .flying-guide-bird {
    display: none;
  }
  .guide-panel {
    padding: 36px 20px;
  }
}

/* ==========================================================================
   7. PRICING SECTION (套餐价格 3大卡片)
   ========================================================================== */
.pricing-section {
  position: relative;
}

.billing-cycle-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.cycle-pill-wrap {
  display: inline-flex;
  background-color: var(--bg-white);
  border: var(--border-medium);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  padding: 4px;
}

.cycle-btn {
  padding: 8px 20px;
  font-size: 0.95rem;
  font-weight: 800;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--dark-ink);
  transition: all var(--transition-fast);
}

.cycle-btn.active {
  background-color: var(--color-yellow);
  border: var(--border-thin);
  box-shadow: 2px 2px 0 var(--dark-ink);
}

.cycle-discount-badge {
  font-size: 0.8rem;
  font-weight: 900;
  color: var(--dark-ink);
  background-color: var(--color-pink);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  border: var(--border-thin);
  box-shadow: 2px 2px 0 var(--dark-ink);
  transform: rotate(-3deg);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.pricing-card {
  background-color: var(--bg-white);
  border: var(--border-thick);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 38px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: 10px 10px 0 var(--dark-ink);
}

/* 高亮中间卡片 (飞羽计划) */
.pricing-card.featured-card {
  border-color: var(--dark-ink);
  background-color: #FFFDF9;
  box-shadow: 10px 10px 0 var(--dark-ink);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-card.featured-card:hover {
  transform: scale(1.03) translateY(-6px);
  box-shadow: 13px 13px 0 var(--dark-ink);
}

.popular-ribbon {
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%) rotate(-1deg);
  background-color: var(--color-pink);
  color: var(--dark-ink);
  font-size: 0.85rem;
  font-weight: 900;
  padding: 5px 18px;
  border-radius: var(--radius-full);
  border: var(--border-medium);
  box-shadow: 2px 2px 0 var(--dark-ink);
  white-space: nowrap;
}

.pricing-header {
  border-bottom: 2px dashed rgba(32, 32, 51, 0.18);
  padding-bottom: 24px;
  margin-bottom: 24px;
  text-align: center;
}

.pricing-plan-badge {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 900;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  border: var(--border-thin);
  margin-bottom: 12px;
}

.badge-starter {
  background-color: var(--color-turquoise);
}

.badge-pro {
  background-color: var(--color-pink);
}

.badge-unlimited {
  background-color: var(--color-lavender);
}

.pricing-title {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--dark-ink);
  margin-bottom: 6px;
}

.pricing-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.price-box {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--dark-ink);
}

.price-num {
  font-size: 2.85rem;
  font-weight: 900;
  line-height: 1;
  color: var(--dark-ink);
}

.price-cycle {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-muted);
}

/* 套餐配置参数列表 (流量、设备、服务) */
.plan-specs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-spec-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--dark-ink);
}

.plan-spec-item .spec-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-pink-hover);
}

.spec-highlight {
  font-weight: 900;
  color: var(--dark-ink);
}

.pricing-btn {
  width: 100%;
}

@media (max-width: 992px) {
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .pricing-card.featured-card {
    transform: none;
  }
  .pricing-card.featured-card:hover {
    transform: translateY(-6px);
  }
}

/* ==========================================================================
   8. FAQ SECTION (常见问题手风琴组件)
   ========================================================================== */
.faq-wrap {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.faq-item {
  background-color: var(--bg-white);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition-fast);
}

.faq-item:hover {
  box-shadow: var(--shadow-md);
}

.faq-question-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  text-align: left;
  background-color: var(--bg-white);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--dark-ink);
  cursor: pointer;
  border: none;
  transition: background-color var(--transition-fast);
}

.faq-question-btn:hover {
  background-color: var(--bg-cream);
}

.faq-icon-pill {
  width: 32px;
  height: 32px;
  background-color: var(--color-yellow);
  border: var(--border-thin);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 2px 2px 0 var(--dark-ink);
  flex-shrink: 0;
  transition: transform var(--transition-normal);
}

.faq-item.active .faq-icon-pill {
  transform: rotate(180deg);
  background-color: var(--color-pink);
}

.faq-answer-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  background-color: var(--bg-cream);
  border-top: 0px solid var(--dark-ink);
}

.faq-item.active .faq-answer-panel {
  border-top: var(--border-thin);
}

.faq-answer-inner {
  padding: 20px 24px;
  font-size: 0.98rem;
  color: var(--dark-ink-soft);
  line-height: 1.7;
}

.faq-answer-inner p:not(:last-child) {
  margin-bottom: 10px;
}

/* ==========================================================================
   9. FINAL CTA & FOOTER (结尾行动号召与页脚)
   ========================================================================== */
.final-cta-section {
  padding: 60px 0 30px;
}

.final-cta-card {
  background-color: var(--color-turquoise);
  border: var(--border-thick);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 56px 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  position: relative;
  overflow: hidden;
}

.final-cta-content {
  max-width: 620px;
  z-index: 2;
}

.final-cta-title {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--dark-ink);
  line-height: 1.2;
  margin-bottom: 14px;
}

.final-cta-desc {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--dark-ink-soft);
  margin-bottom: 28px;
}

.final-cta-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
}

.reassurance-tags {
  display: flex;
  gap: 14px;
  margin-top: 18px;
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--dark-ink);
}

.reassurance-tags span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.final-mascot-box {
  width: 220px;
  height: 220px;
  flex-shrink: 0;
  z-index: 2;
  animation: floatMascot 4s ease-in-out infinite;
  filter: drop-shadow(4px 6px 0 rgba(32, 32, 51, 0.9));
}

@media (max-width: 992px) {
  .final-cta-card {
    flex-direction: column;
    text-align: center;
    padding: 40px 24px;
  }
  .final-cta-actions {
    justify-content: center;
  }
  .reassurance-tags {
    justify-content: center;
    flex-wrap: wrap;
  }
  .final-cta-title {
    font-size: 2.1rem;
  }
}

/* 页脚 Footer */
.site-footer {
  background-color: var(--bg-white);
  border-top: var(--border-thick);
  padding: 60px 0 30px;
  margin-top: 40px;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-brand-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.footer-col-title {
  font-size: 1.08rem;
  font-weight: 900;
  color: var(--dark-ink);
  margin-bottom: 18px;
  position: relative;
  display: inline-block;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--dark-ink-soft);
  transition: color var(--transition-fast), transform var(--transition-fast);
  display: inline-block;
}

.footer-link:hover {
  color: var(--color-pink);
  transform: translateX(3px);
}

/* 底部版权与免责声明 */
.footer-bottom-bar {
  border-top: 2px solid rgba(32, 32, 51, 0.12);
  padding-top: 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.copyright-text {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 600;
}

.back-to-top-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background-color: var(--bg-cream);
  border: var(--border-thin);
  border-radius: var(--radius-full);
  box-shadow: 2px 2px 0 var(--dark-ink);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--dark-ink);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.back-to-top-btn:hover {
  transform: translateY(-2px);
  box-shadow: 4px 4px 0 var(--dark-ink);
  background-color: var(--color-yellow);
}

@media (max-width: 992px) {
  .footer-top-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom-bar {
    flex-direction: column;
    text-align: center;
  }
}


/* ==========================================================================
   11. ARTICLES GRID & DETAIL PAGES (精选文章与专栏知识库)
   ========================================================================== */

/* 首页文章网格 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.article-card {
  background-color: var(--bg-white);
  border: var(--border-thick);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  padding: 30px 24px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.article-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
}

.article-category-tag {
  display: inline-flex;
  align-items: center;
  font-size: 0.78rem;
  font-weight: 900;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  border: var(--border-thin);
  background-color: var(--color-yellow);
  color: var(--dark-ink);
  box-shadow: 1.5px 1.5px 0 var(--dark-ink);
}

.article-category-tag.tag-eval { background-color: var(--color-turquoise); }
.article-category-tag.tag-guide { background-color: var(--color-yellow); }
.article-category-tag.tag-ai { background-color: var(--color-lavender); }
.article-category-tag.tag-stream { background-color: var(--color-pink); }
.article-category-tag.tag-trouble { background-color: var(--color-turquoise-soft); }

.article-card-title {
  font-size: 1.25rem;
  font-weight: 900;
  line-height: 1.35;
  color: var(--dark-ink);
  margin-bottom: 12px;
}

.article-card-title a {
  color: inherit;
  transition: color var(--transition-fast);
}

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

.article-card-excerpt {
  font-size: 0.92rem;
  color: var(--dark-ink-soft);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 2px dashed rgba(32, 32, 51, 0.14);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text-muted);
}

.read-more-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 900;
  color: var(--dark-ink);
  background-color: var(--color-yellow-soft);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--dark-ink);
  box-shadow: 1.5px 1.5px 0 var(--dark-ink);
  transition: all var(--transition-fast);
}

.read-more-link:hover {
  background-color: var(--color-yellow);
  transform: translate(-1px, -1px);
  box-shadow: 2.5px 2.5px 0 var(--dark-ink);
  color: var(--dark-ink);
}

/* 文章详情页专属排版 */
.article-page-wrap {
  padding: 50px 0 90px;
}

.article-detail-container {
  max-width: 880px;
  margin: 0 auto;
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.article-breadcrumb a {
  color: var(--dark-ink);
  transition: color var(--transition-fast);
}

.article-breadcrumb a:hover {
  color: var(--color-pink);
}

.article-main-card {
  background-color: var(--bg-white);
  border: var(--border-thick);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 48px 40px;
  margin-bottom: 40px;
}

.article-header {
  border-bottom: 2.5px solid var(--dark-ink);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.article-post-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.article-post-title {
  font-size: 2.35rem;
  font-weight: 900;
  line-height: 1.25;
  color: var(--dark-ink);
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--dark-ink-soft);
}

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 900;
  color: var(--dark-ink);
  margin-top: 40px;
  margin-bottom: 18px;
  padding-left: 14px;
  border-left: 5px solid var(--color-pink);
}

.article-content h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--dark-ink);
  margin-top: 28px;
  margin-bottom: 14px;
}

.article-content p {
  margin-bottom: 18px;
}

.article-content ul, .article-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.article-content li {
  margin-bottom: 8px;
}

.article-content strong {
  color: var(--dark-ink);
  font-weight: 800;
}

/* 提示卡片 Callout Box */
.article-callout {
  background-color: var(--bg-cream);
  border: var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 20px 24px;
  margin: 26px 0;
  position: relative;
}

.article-callout.tip-pink {
  border-left: 6px solid var(--color-pink);
  background-color: var(--color-pink-soft);
}

.article-callout.tip-yellow {
  border-left: 6px solid var(--color-yellow);
  background-color: var(--color-yellow-soft);
}

.article-callout.tip-turquoise {
  border-left: 6px solid var(--color-turquoise);
  background-color: var(--color-turquoise-soft);
}

/* 文章内对比表格 */
.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
  border: var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--bg-white);
  font-size: 0.95rem;
}

.article-table th {
  background-color: var(--color-yellow-soft);
  color: var(--dark-ink);
  font-weight: 800;
  padding: 14px 18px;
  border-bottom: var(--border-medium);
  text-align: left;
}

.article-table td {
  padding: 12px 18px;
  border-bottom: 1px solid rgba(32, 32, 51, 0.1);
  color: var(--dark-ink-soft);
}

.article-table tr:last-child td {
  border-bottom: none;
}

.article-table tr:hover td {
  background-color: var(--bg-cream);
}

@media (max-width: 992px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-main-card {
    padding: 32px 24px;
  }
  .article-post-title {
    font-size: 1.85rem;
  }
}

@media (max-width: 640px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .article-page-wrap {
    padding: 30px 0 60px;
  }
  .article-main-card {
    padding: 24px 18px;
  }
}