/* 咖啡云 Coffee Cloud - Rich Color Stylesheet */
:root {
  --primary-color: #FFD700;       /* 亮金 */
  --primary-hover: #FFE44D;
  --accent-color: #FF8C00;        /* 琥珀橙 */
  --bg-dark: #100C0A;             /* 深黑咖啡背景 */
  --bg-card: rgba(28, 22, 19, 0.9);
  --bg-card-hover: rgba(45, 35, 30, 0.95);
  --text-main: #FDFBF7;           /* 暖象牙白 */
  --text-muted: #B8ADA6;          /* 柔和浅褐灰 */
  --text-bright: #FFFFFF;
  --border-color: rgba(255, 215, 0, 0.22);
  --border-glow: rgba(255, 215, 0, 0.45);
  
  /* 多彩特色配色系 */
  --color-espresso: #FFA07A;      /* 暖杏铜 */
  --color-latte: #FFD700;         /* 帝王金 */
  --color-mocha: #FF6B6B;         /* 珊红火球 */
  --color-flatwhite: #00E5FF;     /* 电光冰蓝 */
  --color-emerald: #00FF9D;       /* 翡翠绿 */
  --color-purple: #C77DFF;        /* 紫罗兰 */

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-family);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: all 0.25s ease;
}

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

strong {
  color: var(--primary-color);
  font-weight: 700;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(16, 12, 10, 0.93);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  color: #FFF;
  letter-spacing: 0.5px;
}

.brand-logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
  border-radius: 50%;
  box-shadow: 0 0 12px rgba(255, 215, 0, 0.3);
}

.brand span {
  background: linear-gradient(135deg, #FFD700 0%, #FF8C00 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  gap: 26px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: #E2DAD5;
  font-weight: 600;
  font-size: 0.96rem;
}

.nav-links a:hover {
  color: var(--primary-color);
  text-shadow: 0 0 8px rgba(255, 215, 0, 0.4);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  border-radius: 30px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, #FFD700 0%, #FF8C00 100%);
  color: #100C0A;
  box-shadow: 0 4px 18px rgba(255, 140, 0, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(255, 215, 0, 0.6);
  color: #000;
}

.btn-secondary {
  background: rgba(255, 215, 0, 0.12);
  color: #FFE066;
  border: 1px solid rgba(255, 215, 0, 0.35);
}

.btn-secondary:hover {
  background: rgba(255, 215, 0, 0.25);
  border-color: var(--primary-color);
  color: #FFF;
  transform: translateY(-2px);
}

.btn-pbn {
  background: linear-gradient(135deg, #3A251D 0%, #543428 100%);
  color: #FFDDAA;
  border: 1px solid rgba(255, 221, 170, 0.35);
}

.btn-pbn:hover {
  background: linear-gradient(135deg, #543428 0%, #704535 100%);
  color: #FFF;
  border-color: var(--primary-color);
  transform: translateY(-2px);
}

/* Hero Section */
.hero {
  padding: 85px 0 65px;
  text-align: center;
  position: relative;
  background: radial-gradient(circle at 50% 20%, rgba(255, 140, 0, 0.15) 0%, rgba(16, 12, 10, 1) 70%);
}

.badge {
  display: inline-block;
  padding: 6px 18px;
  border-radius: 20px;
  background: rgba(255, 215, 0, 0.15);
  border: 1px solid rgba(255, 215, 0, 0.4);
  color: #FFD700;
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 22px;
  letter-spacing: 1px;
}

.hero h1 {
  font-size: 3.2rem;
  line-height: 1.25;
  margin-bottom: 22px;
  font-weight: 800;
  color: #FFF;
}

.hero h1 span {
  background: linear-gradient(135deg, #FFFFFF 20%, #FFD700 60%, #FF8C00 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.18rem;
  color: #D8CCC4;
  max-width: 780px;
  margin: 0 auto 38px;
  line-height: 1.7;
}

.hero p strong {
  color: #00FF9D; /* Highlight key terms in vibrant emerald */
}

.hero-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-features {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 55px;
  flex-wrap: wrap;
}

.feature-tag {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: #E0D5CE;
  font-weight: 600;
}

.feature-tag svg {
  color: var(--primary-color);
}

/* Section Title */
.section-title {
  text-align: center;
  margin-bottom: 55px;
}

.section-title h2 {
  font-size: 2.3rem;
  font-weight: 800;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #FFF 40%, #FFD700 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-title p {
  color: #B8ADA6;
  font-size: 1.05rem;
}

/* Pricing Grid - Rich Custom Multi-Color Cards */
.pricing-section {
  padding: 75px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.35s ease;
  backdrop-filter: blur(10px);
}

.price-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.6);
}

/* Price Card 1: 美式咖啡 (Espresso) - Copper Gold */
.price-card:nth-child(1) {
  border-color: rgba(255, 160, 122, 0.35);
}
.price-card:nth-child(1) .card-header h3 {
  color: var(--color-espresso);
}
.price-card:nth-child(1) .price {
  color: var(--color-espresso);
}

/* Price Card 2: 拿铁咖啡 (Latte) - Imperial Gold Popular */
.price-card.popular {
  border-color: var(--primary-color);
  background: linear-gradient(180deg, rgba(50, 38, 30, 0.95) 0%, rgba(28, 22, 19, 0.95) 100%);
  box-shadow: 0 8px 30px rgba(255, 215, 0, 0.15);
}
.price-card.popular .card-header h3 {
  color: var(--color-latte);
}
.price-card.popular .price {
  color: var(--color-latte);
}

.popular-badge {
  position: absolute;
  top: -14px;
  right: 20px;
  background: linear-gradient(135deg, #FFD700, #FF8C00);
  color: #100C0A;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 5px 14px;
  border-radius: 14px;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 10px rgba(255, 215, 0, 0.4);
}

/* Price Card 3: 摩卡咖啡 (Mocha) - Crimson Coral */
.price-card:nth-child(3) {
  border-color: rgba(255, 107, 107, 0.35);
}
.price-card:nth-child(3) .card-header h3 {
  color: var(--color-mocha);
}
.price-card:nth-child(3) .price {
  color: var(--color-mocha);
}

/* Price Card 4: 澳白咖啡 (Flat White) - Ice Cyan */
.price-card:nth-child(4) {
  border-color: rgba(0, 229, 255, 0.35);
}
.price-card:nth-child(4) .card-header h3 {
  color: var(--color-flatwhite);
}
.price-card:nth-child(4) .price {
  color: var(--color-flatwhite);
}

.card-header h3 {
  font-size: 1.35rem;
  margin-bottom: 8px;
  font-weight: 700;
}

.card-header .price {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.card-header .price span {
  font-size: 1rem;
  color: #B8ADA6;
  font-weight: 400;
}

.card-features {
  list-style: none;
  margin: 24px 0 30px;
  flex-grow: 1;
}

.card-features li {
  padding: 9px 0;
  font-size: 0.92rem;
  color: #D8CCC4;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.07);
}

.card-features li strong {
  color: #FFF;
}

.card-features li svg {
  color: var(--primary-color);
  flex-shrink: 0;
}

/* Features Grid - Distinct Color Accents */
.features-section {
  padding: 75px 0;
  background: rgba(0, 0, 0, 0.3);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.feature-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 32px;
  border-radius: var(--radius-md);
  transition: all 0.3s ease;
}

.feature-box:nth-child(1) { border-top: 3px solid var(--color-flatwhite); }
.feature-box:nth-child(2) { border-top: 3px solid var(--color-latte); }
.feature-box:nth-child(3) { border-top: 3px solid var(--color-emerald); }

.feature-box:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.feature-box:nth-child(1) .feature-icon {
  background: rgba(0, 229, 255, 0.15);
  color: var(--color-flatwhite);
}

.feature-box:nth-child(2) .feature-icon {
  background: rgba(255, 215, 0, 0.15);
  color: var(--color-latte);
}

.feature-box:nth-child(3) .feature-icon {
  background: rgba(0, 255, 157, 0.15);
  color: var(--color-emerald);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-box h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
  color: #FFF;
}

.feature-box p {
  color: #C2B6AF;
  font-size: 0.94rem;
  line-height: 1.65;
}

/* Articles Section - Color Coded Tags */
.articles-section {
  padding: 75px 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
}

.article-card:hover {
  border-color: var(--primary-color);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.5);
}

.article-card:nth-child(1) .article-tag { color: #FF9F43; }
.article-card:nth-child(2) .article-tag { color: #00E5FF; }
.article-card:nth-child(3) .article-tag { color: #00FF9D; }
.article-card:nth-child(4) .article-tag { color: #C77DFF; }
.article-card:nth-child(5) .article-tag { color: #FFD700; }
.article-card:nth-child(6) .article-tag { color: #FF6B6B; }

.article-tag {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.article-card h3 a {
  font-size: 1.18rem;
  margin-bottom: 12px;
  line-height: 1.45;
  color: #FFFFFF;
}

.article-card h3 a:hover {
  color: var(--primary-color);
}

.article-card p {
  color: #B8ADA6;
  font-size: 0.92rem;
  margin-bottom: 22px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.86rem;
  color: #9E928A;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  padding-top: 14px;
}

.article-footer a {
  color: var(--primary-color);
  font-weight: 600;
}

/* User Reviews Section - Custom Avatar & Text Accent */
.reviews-section {
  padding: 75px 0;
  background: rgba(0, 0, 0, 0.35);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 26px;
  border-radius: var(--radius-md);
  transition: all 0.3s ease;
}

.review-card:hover {
  border-color: rgba(255, 215, 0, 0.5);
  transform: translateY(-4px);
}

.review-card:nth-child(1) .avatar { background: linear-gradient(135deg, #FFD700, #FF8C00); color: #100C0A; }
.review-card:nth-child(2) .avatar { background: linear-gradient(135deg, #00E5FF, #0088FF); color: #100C0A; }
.review-card:nth-child(3) .avatar { background: linear-gradient(135deg, #00FF9D, #009955); color: #100C0A; }

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
}

.review-info h4 {
  font-size: 1.05rem;
  color: #FFF;
}

.review-info span {
  font-size: 0.82rem;
  color: #E2DAD5;
}

.stars {
  color: #FFD700;
  font-size: 0.95rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.review-card p {
  color: #D8CCC4;
  font-size: 0.95rem;
  line-height: 1.65;
}

/* FAQ Section */
.faq-section {
  padding: 75px 0;
}

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

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  overflow: hidden;
  transition: border-color 0.25s ease;
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.08rem;
  font-weight: 700;
  color: #FFF;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-question:hover {
  color: var(--primary-color);
}

.faq-answer {
  padding: 0 24px 22px;
  color: #D4C7BF;
  font-size: 0.98rem;
  line-height: 1.7;
  display: none;
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
  padding-top: 16px;
}

.faq-answer a {
  color: #00E5FF;
}

.faq-item.active {
  border-color: var(--primary-color);
}

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

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

.faq-icon {
  transition: transform 0.3s ease;
  color: #B8ADA6;
}

/* Footer & PBN Links (Core Requirement 2) */
footer {
  background: #090706;
  border-top: 1px solid var(--border-color);
  padding: 55px 0 32px;
  margin-top: auto;
  text-align: center;
  color: #A89F99;
  font-size: 0.92rem;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 800;
  color: #FFF;
}

.footer-brand span {
  color: var(--primary-color);
}

.footer-brand img {
  width: 34px;
  height: 34px;
}

.footer-links-area {
  margin-top: 15px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  width: 100%;
  max-width: 820px;
}

.pbn-friend-links {
  font-size: 0.8rem;
  color: rgba(184, 173, 166, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.pbn-friend-links span {
  color: rgba(184, 173, 166, 0.4);
}

.pbn-friend-links a {
  color: rgba(200, 190, 182, 0.75);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.25s ease;
}

.pbn-friend-links a:hover {
  color: var(--primary-color);
  text-decoration: underline;
}

.copyright {
  font-size: 0.85rem;
  color: rgba(168, 159, 153, 0.55);
  margin-top: 10px;
}

/* Article Page Layout & Color Rich Typography */
.article-container {
  max-width: 920px;
  margin: 45px auto;
  padding: 0 20px;
}

.breadcrumbs {
  font-size: 0.9rem;
  color: #A89F99;
  margin-bottom: 26px;
}

.breadcrumbs a {
  color: #FFD700;
}

.breadcrumbs a:hover {
  color: #FFF;
}

.article-header {
  margin-bottom: 32px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-color);
}

.article-header h1 {
  font-size: 2.3rem;
  line-height: 1.35;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #FFF 30%, #FFD700 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.article-meta {
  display: flex;
  gap: 22px;
  font-size: 0.88rem;
  color: #B8ADA6;
}

.article-meta span:nth-child(2) {
  color: #00E5FF; /* Highlight category */
}

.article-body {
  font-size: 1.08rem;
  line-height: 1.85;
  color: #E8DFD9;
}

.article-body h2 {
  font-size: 1.55rem;
  margin: 36px 0 18px;
  color: #FFD700;
  border-left: 4px solid #FF8C00;
  padding-left: 14px;
}

.article-body h3 {
  font-size: 1.28rem;
  margin: 26px 0 14px;
  color: #00E5FF;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body p strong {
  color: #FFD700;
}

.article-body ul, .article-body ol {
  margin: 0 0 24px 26px;
}

.article-body li {
  margin-bottom: 10px;
  color: #E2DAD5;
}

.article-body li strong {
  color: #00FF9D;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(50, 38, 30, 0.95), rgba(28, 22, 19, 0.95));
  border: 1px solid var(--primary-color);
  border-radius: var(--radius-md);
  padding: 35px;
  margin: 45px 0;
  text-align: center;
  box-shadow: 0 8px 30px rgba(255, 215, 0, 0.12);
}

.article-cta-box h3 {
  font-size: 1.45rem;
  margin-bottom: 12px;
  color: #FFF;
}

.article-cta-box p {
  color: #C8BEB7;
  margin-bottom: 22px;
}

.related-articles {
  margin-top: 55px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.related-articles h3 {
  color: #FFF;
  font-size: 1.3rem;
  margin-bottom: 18px;
}

.related-articles ul li a {
  color: #FFD700;
  font-weight: 500;
}

.related-articles ul li a:hover {
  color: #00E5FF;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.1rem;
  }
  .nav-links {
    display: none;
  }
  .pricing-grid, .articles-grid, .features-grid, .reviews-grid {
    grid-template-columns: 1fr;
  }
}