/* ========================================
   妹相随～黑白世界的缤纷冒险 - 游戏官网样式
   ======================================== */

/* --- CSS Variables --- */
:root {
  --color-primary: #1c1c1c;
  --color-secondary-1: #dcdcdc;
  --color-secondary-2: #8c8c8c;
  --color-secondary-3: #848484;
  --color-white: #ffffff;
  --color-bg-dark: #111111;
  --color-bg-section: #f5f5f5;
  --color-bg-card: #ffffff;
  --color-border: #e0e0e0;
  --color-accent: #5a5a5a;
  --color-star: #f4c542;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Noto Sans SC', 'Segoe UI', Arial, sans-serif;
  background: var(--color-white);
  color: var(--color-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-secondary-2);
}

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

ul, ol {
  list-style: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Section Common --- */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--color-bg-section);
}

.section-dark {
  background: var(--color-primary);
  color: var(--color-secondary-1);
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.section-subtitle {
  text-align: center;
  color: var(--color-secondary-2);
  font-size: 1rem;
  margin-bottom: 48px;
}

/* ========================================
   Header / Navigation
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(28, 28, 28, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: background var(--transition-normal);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-white);
}

.logo img {
  width: 36px;
  height: 36px;
  border-radius: 6px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  color: var(--color-secondary-1);
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.nav-links a:hover {
  color: var(--color-white);
}

.nav-links a i {
  font-size: 0.85rem;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: all var(--transition-normal);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Mobile Nav --- */
.mobile-nav {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  width: 100%;
  background: rgba(28, 28, 28, 0.98);
  backdrop-filter: blur(12px);
  padding: 16px 0;
  z-index: 999;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.mobile-nav.active {
  display: block;
}

.mobile-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  color: var(--color-secondary-1);
  font-size: 1rem;
  transition: background var(--transition-fast);
}

.mobile-nav a:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-white);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  margin-top: 64px;
  background: linear-gradient(135deg, #1c1c1c 0%, #2a2a2a 50%, #1c1c1c 100%);
  color: var(--color-white);
  padding: 48px 0 56px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(220, 220, 220, 0.03) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 20px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--color-secondary-1);
}

.hero-badge i {
  color: var(--color-star);
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: 1px;
}

.hero h1 small {
  display: block;
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-secondary-2);
  margin-top: 6px;
}

.hero-desc {
  max-width: 700px;
  color: var(--color-secondary-2);
  font-size: 0.95rem;
  line-height: 1.8;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-top: 4px;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
  color: var(--color-secondary-1);
}

.hero-meta-item i {
  color: var(--color-secondary-2);
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.hero-tag {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.78rem;
  color: var(--color-secondary-2);
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--color-white);
  color: var(--color-primary);
  padding: 14px 36px;
  border-radius: 50px;
  font-size: 1.05rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: 0 4px 20px rgba(255, 255, 255, 0.15);
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(255, 255, 255, 0.25);
  color: var(--color-primary);
}

.btn-download:active {
  transform: translateY(0);
}

.btn-download-sm {
  padding: 10px 24px;
  font-size: 0.9rem;
}

/* ========================================
   News Section
   ======================================== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

.news-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all var(--transition-normal);
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.news-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.news-date {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--color-secondary-2);
}

.news-type {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 50px;
  background: var(--color-primary);
  color: var(--color-white);
  font-weight: 500;
}

.news-type.update {
  background: #2d2d2d;
}

.news-type.announce {
  background: var(--color-secondary-3);
}

.news-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  line-height: 1.5;
}

.news-card p {
  font-size: 0.9rem;
  color: var(--color-secondary-2);
  line-height: 1.7;
  margin-bottom: 16px;
}

.news-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  transition: gap var(--transition-fast);
}

.news-link:hover {
  gap: 10px;
  color: var(--color-primary);
}

/* ========================================
   Media Gallery
   ======================================== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.gallery-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 16 / 9;
  background: var(--color-primary);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-overlay {
  position: absolute;
  inset: 0;
  background: rgba(28, 28, 28, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.gallery-item:hover .gallery-overlay {
  opacity: 1;
}

.gallery-overlay i {
  font-size: 2rem;
  color: var(--color-white);
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.lightbox.active {
  display: flex;
}

.lightbox img {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: var(--radius-md);
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 28px;
  font-size: 2rem;
  color: var(--color-white);
  cursor: pointer;
  transition: opacity var(--transition-fast);
  background: none;
  border: none;
}

.lightbox-close:hover {
  opacity: 0.7;
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 2.5rem;
  color: var(--color-white);
  cursor: pointer;
  background: none;
  border: none;
  padding: 12px;
  transition: opacity var(--transition-fast);
}

.lightbox-nav:hover {
  opacity: 0.7;
}

.lightbox-prev {
  left: 20px;
}

.lightbox-next {
  right: 20px;
}

/* ========================================
   Reviews Section
   ======================================== */
.reviews-stats {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

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

.reviews-score .score-number {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--color-primary);
}

.reviews-score .score-label {
  font-size: 0.85rem;
  color: var(--color-secondary-2);
  margin-top: 4px;
}

.reviews-breakdown {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rating-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
}

.rating-row .stars {
  color: var(--color-star);
  min-width: 90px;
}

.rating-bar {
  width: 160px;
  height: 8px;
  background: var(--color-border);
  border-radius: 4px;
  overflow: hidden;
}

.rating-bar-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 4px;
}

.rating-row .percent {
  min-width: 36px;
  text-align: right;
  color: var(--color-secondary-2);
}

.reviews-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 40px;
}

.review-tag {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.82rem;
  color: var(--color-primary);
}

.review-tag i {
  color: var(--color-secondary-2);
}

.reviews-carousel {
  position: relative;
  overflow: hidden;
}

.reviews-track {
  display: flex;
  transition: transform 0.5s ease;
}

.review-card {
  min-width: 100%;
  padding: 0 12px;
}

.review-card-inner {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
}

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

.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.review-info h4 {
  font-size: 1rem;
  margin-bottom: 2px;
}

.review-info .stars {
  color: var(--color-star);
  font-size: 0.85rem;
}

.review-card-inner p {
  font-size: 0.95rem;
  color: var(--color-secondary-2);
  line-height: 1.8;
  font-style: italic;
}

.review-date {
  font-size: 0.8rem;
  color: var(--color-secondary-3);
  margin-top: 12px;
}

.carousel-controls {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
}

.carousel-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  font-size: 0.9rem;
  color: var(--color-primary);
}

.carousel-btn:hover {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.carousel-dots {
  display: flex;
  align-items: center;
  gap: 8px;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-border);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.carousel-dot.active {
  background: var(--color-primary);
  width: 24px;
  border-radius: 4px;
}

/* ========================================
   Version History
   ======================================== */
.version-timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.version-timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.version-item {
  position: relative;
  padding-left: 56px;
  margin-bottom: 36px;
}

.version-item:last-child {
  margin-bottom: 0;
}

.version-dot {
  position: absolute;
  left: 12px;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-white);
  border: 3px solid var(--color-primary);
}

.version-item:first-child .version-dot {
  background: var(--color-primary);
}

.version-header {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.version-number {
  font-weight: 700;
  font-size: 1.1rem;
}

.version-date {
  font-size: 0.82rem;
  color: var(--color-secondary-2);
}

.version-size {
  font-size: 0.78rem;
  background: var(--color-bg-section);
  padding: 2px 10px;
  border-radius: 50px;
  color: var(--color-secondary-2);
}

.version-platform {
  font-size: 0.78rem;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 2px 10px;
  border-radius: 50px;
}

.version-content {
  font-size: 0.9rem;
  color: var(--color-secondary-2);
  line-height: 1.8;
  margin-bottom: 12px;
}

.version-content ul {
  padding-left: 18px;
}

.version-content ul li {
  list-style: disc;
  margin-bottom: 4px;
}

.btn-download-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border: 1px solid var(--color-primary);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-download-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

/* ========================================
   Game Guide / Strategy
   ======================================== */
.guide-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 32px;
}

.guide-filter-btn {
  padding: 8px 20px;
  border: 1px solid var(--color-border);
  border-radius: 50px;
  background: var(--color-bg-card);
  cursor: pointer;
  font-size: 0.85rem;
  transition: all var(--transition-fast);
  font-family: inherit;
  color: var(--color-primary);
}

.guide-filter-btn:hover,
.guide-filter-btn.active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.guide-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition-normal);
}

.guide-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.guide-card-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  margin-bottom: 12px;
}

.guide-card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--color-bg-section);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--color-primary);
}

.guide-difficulty {
  display: flex;
  gap: 3px;
}

.guide-difficulty span {
  width: 6px;
  height: 18px;
  border-radius: 2px;
  background: var(--color-border);
}

.guide-difficulty span.filled {
  background: var(--color-primary);
}

.guide-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.guide-card p {
  font-size: 0.88rem;
  color: var(--color-secondary-2);
  line-height: 1.7;
  margin-bottom: 14px;
}

.guide-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.guide-card-tag {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 50px;
  background: var(--color-bg-section);
  color: var(--color-secondary-2);
}

/* ========================================
   Chapters Section
   ======================================== */
.chapters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}

.chapter-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.chapter-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.chapter-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--color-primary);
}

.chapter-card.side-chapter::before {
  background: var(--color-secondary-2);
}

.chapter-badge {
  display: inline-block;
  font-size: 0.72rem;
  padding: 2px 10px;
  border-radius: 50px;
  background: var(--color-primary);
  color: var(--color-white);
  margin-bottom: 10px;
  font-weight: 600;
}

.chapter-card.side-chapter .chapter-badge {
  background: var(--color-secondary-2);
}

.chapter-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.chapter-card .chapter-desc {
  font-size: 0.88rem;
  color: var(--color-secondary-2);
  line-height: 1.7;
  margin-bottom: 14px;
}

.chapter-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 12px;
}

.chapter-meta-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.8rem;
  color: var(--color-secondary-3);
}

.chapter-meta-item i {
  font-size: 0.75rem;
}

.chapter-characters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chapter-character {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 50px;
  background: var(--color-bg-section);
  color: var(--color-secondary-2);
}

.chapter-mood {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.78rem;
  color: var(--color-secondary-3);
  margin-top: 10px;
}

/* ========================================
   FAQ Section
   ======================================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow var(--transition-normal);
}

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

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  background: var(--color-bg-card);
  font-weight: 600;
  font-size: 0.95rem;
  gap: 16px;
  transition: background var(--transition-fast);
  border: none;
  width: 100%;
  text-align: left;
  font-family: inherit;
  color: var(--color-primary);
}

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

.faq-question i {
  transition: transform var(--transition-normal);
  font-size: 0.85rem;
  flex-shrink: 0;
  color: var(--color-secondary-2);
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.9rem;
  color: var(--color-secondary-2);
  line-height: 1.8;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--color-primary);
  color: var(--color-secondary-1);
  padding: 56px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  font-size: 0.88rem;
  color: var(--color-secondary-2);
  line-height: 1.8;
  margin-top: 12px;
  max-width: 320px;
}

.footer h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer-links a {
  display: block;
  font-size: 0.85rem;
  color: var(--color-secondary-2);
  padding: 5px 0;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: var(--color-secondary-3);
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a {
  font-size: 0.82rem;
  color: var(--color-secondary-3);
}

.footer-bottom-links a:hover {
  color: var(--color-white);
}

/* ========================================
   Back to Top
   ======================================== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  border: none;
  box-shadow: var(--shadow-md);
  z-index: 900;
  font-size: 1rem;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 992px) {
  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

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

  .hero h1 {
    font-size: 2rem;
  }

  .reviews-stats {
    gap: 24px;
  }

  .rating-bar {
    width: 120px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 48px 0;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .hero-meta {
    gap: 8px;
  }

  .hero-meta-item {
    padding: 5px 10px;
    font-size: 0.78rem;
  }

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

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

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

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

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .reviews-score .score-number {
    font-size: 2.5rem;
  }

  .rating-bar {
    width: 100px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero {
    padding: 32px 0 40px;
  }

  .hero h1 {
    font-size: 1.4rem;
  }

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

  .btn-download {
    padding: 12px 28px;
    font-size: 0.95rem;
  }

  .lightbox {
    padding: 16px;
  }

  .lightbox-nav {
    font-size: 1.5rem;
  }
}