/* ===== CSS VARIABLES ===== */
:root {
  /* Colors */
  --primary-color: #FF6B35;
  --primary-color-dark: #E5561F;
  --secondary-color: #4A90E2;
  --accent-color: #F7931E;
  --success-color: #4CAF50;
  
  --text-color: #2D3436;
  --text-color-light: #636E72;
  --text-color-lighter: #B2BEC3;
  --bg-color: #FFFFFF;
  --bg-color-alt: #F8F9FA;
  --border-color: #E9ECEF;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xl: 3.5rem;
  --font-size-lg: 2.25rem;
  --font-size-md: 1.5rem;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-xs: 0.75rem;
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --container-max-width: 1200px;
  --section-padding: 5rem 0;
  --section-padding-mobile: 3rem 0;
  
  /* Shadows & Effects */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
  
  --border-radius: 0.5rem;
  --border-radius-lg: 1rem;
  
  /* Transitions */
  --transition: all 0.3s ease;
}

/* ===== RESET & BASE ===== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--text-color);
  line-height: 1.6;
  background-color: var(--bg-color);
  overflow-x: hidden;
}

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

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

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
  transition: var(--transition);
}

ul {
  list-style: none;
}

/* ===== UTILITY CLASSES ===== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

.section__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  text-align: center;
  margin-bottom: 1rem;
  color: var(--text-color);
}

.section__description {
  font-size: var(--font-size-base);
  color: var(--text-color-light);
  text-align: center;
  margin-bottom: 3rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  border-radius: var(--border-radius);
  transition: var(--transition);
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
}

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

.btn--primary:hover {
  background-color: var(--primary-color-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background-color: transparent;
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.btn--secondary:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

.btn--tertiary {
  background-color: var(--secondary-color);
  color: white;
}

.btn--tertiary:hover {
  background-color: #3A7BC8;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ===== BREADCRUMB ===== */
.breadcrumb {
  padding: 1rem 0;
  margin-top: 60px; /* Account for fixed header */
  background-color: var(--bg-color-alt);
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--font-size-sm);
}

.breadcrumb__item {
  display: flex;
  align-items: center;
}

.breadcrumb__item:not(:last-child)::after {
  content: '/';
  margin-left: 0.5rem;
  color: var(--text-color-lighter);
}

.breadcrumb__link {
  color: var(--text-color-light);
  transition: var(--transition);
}

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

.breadcrumb__item--current {
  color: var(--text-color);
  font-weight: var(--font-weight-medium);
}

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
  min-height: 60px;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav__logo {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius);
}

.nav__title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--primary-color);
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__link {
  font-weight: var(--font-weight-medium);
  color: var(--text-color);
  position: relative;
}

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

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: var(--transition);
}

.nav__link:hover::after {
  width: 100%;
}

/* ===== LANGUAGE SELECTOR ===== */
.nav__language {
  position: relative;
}

.language-selector {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-color: white;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: 0.75rem 2.5rem 0.75rem 1rem;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-color);
  cursor: pointer;
  transition: all 0.3s ease;
  min-width: 100px;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.75rem center;
  background-repeat: no-repeat;
  background-size: 1rem;
  position: relative;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.language-selector:hover {
  border-color: var(--primary-color);
  box-shadow: 0 4px 12px rgba(26, 115, 232, 0.15);
  transform: translateY(-1px);
}

.language-selector:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

.language-selector option {
  padding: 0.75rem;
  background-color: white;
  color: var(--text-color);
  font-weight: var(--font-weight-medium);
}

.language-selector option:hover {
  background-color: var(--bg-color-alt);
}

/* Enhanced language selector styling */
.language-selector::-ms-expand {
  display: none;
}

/* Firefox specific styling */
@-moz-document url-prefix() {
  .language-selector {
    padding-right: 2rem;
  }
}

/* Animation for language change */
@keyframes languageChange {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.language-selector.changing {
  animation: languageChange 0.3s ease-in-out;
}

/* Custom dropdown styling for modern browsers */
.language-selector optgroup {
  font-weight: var(--font-weight-bold);
  color: var(--primary-color);
  background-color: var(--bg-color-alt);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--border-radius);
  background-color: transparent;
  transition: var(--transition);
}

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

.nav__toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--text-color);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== HERO SECTION ===== */
.hero {
  padding: calc(60px + 5rem) 0 5rem;
  background: linear-gradient(135deg, #FF6B35 0%, #F7931E 100%);
  color: white;
  overflow: hidden;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 100" fill="white"><polygon points="0,20 50,40 100,35 150,50 200,48 250,61 300,67 350,80 400,76 450,75 500,70 550,74 600,61 650,69 700,70 750,75 800,75 850,68 900,70 950,62 1000,65 1000,100 0,100"/></svg>') repeat-x;
  background-size: 1000px 100px;
  bottom: -1px;
  opacity: 0.1;
  z-index: -1;
}

.hero__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: 1rem;
}

.hero__subtitle {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  margin-bottom: 1.5rem;
  opacity: 0.9;
}

.hero__description {
  font-size: var(--font-size-base);
  margin-bottom: 2.5rem;
  opacity: 0.8;
  line-height: 1.7;
}

.hero__buttons {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
}

.hero__buttons .btn--secondary {
  background-color: rgba(255, 255, 255, 0.1);
  color: white;
  border-color: rgba(255, 255, 255, 0.3);
}

.hero__buttons .btn--secondary:hover {
  background-color: white;
  color: var(--primary-color);
}

.hero__stats {
  display: flex;
  gap: 2rem;
}

.stat {
  text-align: center;
}

.stat__number {
  display: block;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  margin-bottom: 0.25rem;
}

.stat__label {
  font-size: var(--font-size-sm);
  opacity: 0.8;
}

.hero__image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero__video {
  position: relative;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transform: perspective(1000px) rotateY(-5deg);
  transition: var(--transition);
  aspect-ratio: 16 / 9;
}

.hero__video:hover {
  transform: perspective(1000px) rotateY(0deg);
}

.hero__iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  border-radius: var(--border-radius-lg);
}

/* ===== DOWNLOAD SECTION ===== */
.download {
  padding: var(--section-padding);
  background-color: var(--bg-color-alt);
}

.download__container {
  text-align: center;
}

.download__buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.download__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 1.5rem;
  background-color: white;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  transition: var(--transition);
  min-width: 160px;
  text-decoration: none;
}

.download__btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-color);
}

.download__btn-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.download__platform {
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-base);
  color: var(--text-color);
}

.download__btn .download__size {
  font-size: var(--font-size-sm);
  color: var(--text-color-light);
}

.download__btn img {
  height: 60px;
  transition: var(--transition);
}

.download__btn:hover img {
  transform: scale(1.05);
}

.download__info {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.download__tag,
.download__warning,
.download__difficulty {
  padding: 0.5rem 1rem;
  background-color: white;
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  box-shadow: var(--shadow-sm);
}

.download__tag {
  background-color: var(--success-color);
  color: white;
}

.download__warning {
  background-color: #FFF3CD;
  color: #856404;
  border: 1px solid #FFEAA7;
}

.download__difficulty {
  background-color: #FFE6E6;
  color: #D32F2F;
  border: 1px solid #FFCDD2;
}

/* ===== CONTROLS SECTION ===== */
.controls {
  padding: var(--section-padding);
  background-color: var(--bg-color);
}

.controls__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.control__group {
  background: white;
  padding: 2rem;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

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

.control__title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--text-color);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary-color);
}

.control__list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.control__item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem;
  background: var(--bg-color-alt);
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.control__item:hover {
  background: #F0F0F0;
}

.control__key {
  background: var(--text-color);
  color: white;
  padding: 0.5rem 0.75rem;
  border-radius: 0.25rem;
  font-family: 'Courier New', monospace;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  white-space: nowrap;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.control__description {
  color: var(--text-color);
  font-weight: var(--font-weight-medium);
}

.physics__list,
.combat__list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.physics__list li,
.combat__list li {
  padding: 0.75rem;
  background: var(--bg-color-alt);
  border-radius: var(--border-radius);
  border-left: 3px solid var(--primary-color);
  transition: var(--transition);
}

.physics__list li:hover,
.combat__list li:hover {
  background: #F0F0F0;
  border-left-color: var(--accent-color);
}

/* ===== STRATEGIES SECTION ===== */
.strategies {
  padding: var(--section-padding);
  background-color: var(--bg-color-alt);
}

.strategies__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.strategy__card {
  background-color: white;
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

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

.strategy__icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  text-align: center;
}

.strategy__title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  margin-bottom: 1rem;
  color: var(--text-color);
}

.strategy__description {
  color: var(--text-color-light);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.strategy__tips {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.tip {
  font-size: var(--font-size-sm);
  color: var(--text-color-light);
  padding: 0.5rem 0;
  border-left: 3px solid var(--primary-color);
  padding-left: 1rem;
}

/* ===== ENVIRONMENTS SECTION ===== */
.environments {
  padding: var(--section-padding);
}

.environments__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.environment__card {
  background-color: white;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

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

.environment__image {
  height: 200px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  display: flex;
  align-items: center;
  justify-content: center;
}

.environment__placeholder {
  font-size: 4rem;
  opacity: 0.8;
}

.environment__content {
  padding: 2rem;
}

.environment__title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  margin-bottom: 1rem;
  color: var(--text-color);
}

.environment__description {
  color: var(--text-color-light);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.environment__features {
  list-style: none;
  padding: 0;
}

.environment__features li {
  padding: 0.5rem 0;
  color: var(--text-color-light);
  position: relative;
  padding-left: 1.5rem;
}

.environment__features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success-color);
  font-weight: bold;
}

/* ===== FEATURES SECTION ===== */
.features {
  padding: var(--section-padding);
  background-color: var(--bg-color-alt);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature__card {
  background-color: white;
  padding: 2rem;
  border-radius: var(--border-radius-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.feature__icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 50%;
  color: white;
}

.feature__emoji {
  font-size: 2rem;
}

.feature__icon img {
  width: 40px;
  height: 40px;
  filter: brightness(0) invert(1);
}

.feature__title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  margin-bottom: 1rem;
  color: var(--text-color);
}

.feature__description {
  color: var(--text-color-light);
  line-height: 1.6;
}

/* ===== WALKTHROUGHS SECTION ===== */
.walkthroughs {
  padding: var(--section-padding);
  background-color: var(--bg-color);
}

.walkthroughs__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.walkthrough__card {
  background: white;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

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

.walkthrough__header {
  padding: 1.5rem 2rem 1rem;
  background: linear-gradient(135deg, var(--bg-color-alt), #f0f0f0);
  border-bottom: 1px solid var(--border-color);
}

.walkthrough__difficulty {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.75rem;
}

.walkthrough__difficulty--beginner {
  background: #E8F5E8;
  color: #2E7D32;
}

.walkthrough__difficulty--intermediate {
  background: #FFF3E0;
  color: #F57C00;
}

.walkthrough__difficulty--expert {
  background: #FFEBEE;
  color: #D32F2F;
}

.walkthrough__title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--text-color);
  margin: 0;
}

.walkthrough__content {
  padding: 2rem;
}

.walkthrough__description {
  color: var(--text-color-light);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.walkthrough__steps {
  list-style: none;
  margin-bottom: 1.5rem;
}

.walkthrough__steps li {
  padding: 0.5rem 0;
  color: var(--text-color);
  position: relative;
  padding-left: 2rem;
  margin-bottom: 0.5rem;
}

.walkthrough__steps li::before {
  content: counter(step-counter);
  counter-increment: step-counter;
  position: absolute;
  left: 0;
  top: 0.5rem;
  background: var(--primary-color);
  color: white;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
}

.walkthrough__steps {
  counter-reset: step-counter;
}

.walkthrough__tips {
  background: var(--bg-color-alt);
  padding: 1rem;
  border-radius: var(--border-radius);
  border-left: 3px solid var(--accent-color);
  font-size: var(--font-size-sm);
  color: var(--text-color-light);
}

.walkthrough__tips strong {
  color: var(--accent-color);
  font-weight: var(--font-weight-semibold);
}

/* ===== ADVANCED TIPS SECTION ===== */
.advanced-tips {
  padding: var(--section-padding);
  background-color: var(--bg-color-alt);
}

.tips__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.tip__card {
  background: white;
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.tip__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.tip__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: white;
  border-radius: 50%;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  margin-bottom: 1.5rem;
}

.tip__title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--text-color);
  margin-bottom: 1rem;
}

.tip__description {
  color: var(--text-color-light);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.tip__highlight {
  background: linear-gradient(135deg, var(--bg-color-alt), #f0f8ff);
  padding: 1rem;
  border-radius: var(--border-radius);
  border-left: 3px solid var(--secondary-color);
  font-size: var(--font-size-sm);
  color: var(--text-color);
  font-weight: var(--font-weight-medium);
}

/* ===== STATS SECTION ===== */
.stats {
  padding: var(--section-padding);
  background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
  color: white;
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.stat__card {
  text-align: center;
  padding: 2rem;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-lg);
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.stat__card:hover {
  transform: translateY(-5px);
  background-color: rgba(255, 255, 255, 0.15);
}

.stat__card .stat__number {
  font-size: 3rem;
  font-weight: var(--font-weight-bold);
  display: block;
  margin-bottom: 0.5rem;
}

.stat__card .stat__label {
  font-size: var(--font-size-base);
  opacity: 0.9;
}

/* ===== FAQ SECTION ===== */
.faq {
  padding: var(--section-padding);
}

.faq__list {
  max-width: 800px;
  margin: 0 auto;
}

.faq__item {
  border-bottom: 1px solid var(--border-color);
}

.faq__question {
  width: 100%;
  padding: 1.5rem 0;
  text-align: left;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

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

.faq__icon {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-light);
  transition: var(--transition);
}

.faq__item.active .faq__icon {
  transform: rotate(45deg);
}

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq__item.active .faq__answer {
  max-height: 200px;
}

.faq__answer p {
  padding: 0 0 1.5rem 0;
  color: var(--text-color-light);
  line-height: 1.6;
}

/* ===== ABOUT SECTION ===== */
.about {
  padding: var(--section-padding);
  background-color: var(--bg-color-alt);
}

.about__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about__text h3 {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  margin-bottom: 1rem;
  color: var(--text-color);
}

.about__text p {
  color: var(--text-color-light);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.about__img {
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
}

/* ===== FOOTER ===== */
.footer {
  background-color: var(--text-color);
  color: white;
  padding: 3rem 0 1rem;
}

.footer__content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer__title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.footer__subtitle {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: 1rem;
}

.footer__description {
  opacity: 0.8;
  line-height: 1.6;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer__link {
  opacity: 0.8;
  transition: var(--transition);
}

.footer__link:hover {
  opacity: 1;
  color: var(--primary-color);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  text-align: center;
}

.footer__legal {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.footer__legal-links {
  display: flex;
  gap: 1rem;
}

.footer__legal-link {
  opacity: 0.8;
  font-size: var(--font-size-sm);
  transition: var(--transition);
}

.footer__legal-link:hover {
  opacity: 1;
  color: var(--primary-color);
}

.footer__disclaimer {
  font-size: var(--font-size-xs);
  opacity: 0.6;
  max-width: 600px;
  margin: 0 auto;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
  .hero__container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .about__content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-xl: 2.5rem;
    --font-size-lg: 1.75rem;
    --section-padding: var(--section-padding-mobile);
  }
  
  body {
    overflow-x: hidden;
    width: 100%;
  }
  
  * {
    max-width: 100%;
  }
  
  /* 优化移动端头部 */
  .nav {
    padding: 0.5rem 0;
    min-height: 56px;
    position: relative;
  }
  
  .nav__brand {
    flex: 1;
    min-width: 0;
  }
  
  .nav__title {
    font-size: 1.25rem;
    max-width: calc(100vw - 160px);
  }
  
  .breadcrumb {
    margin-top: 56px;
    padding: 0.75rem 0;
  }
  
  .hero {
    padding: calc(56px + 4rem) 0 4rem;
  }
  
  .nav__menu {
    position: fixed;
    top: 56px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 56px);
    background-color: white;
    flex-direction: column;
    justify-content: start;
    padding: 1.5rem;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    z-index: 999;
    gap: 1rem;
  }
  
  .nav__menu .nav__language {
    position: static;
    transform: none;
    order: -1;
    margin-bottom: 1rem;
  }
  
  .nav__menu .language-selector {
    width: 100%;
    padding: 1rem;
    font-size: var(--font-size-base);
    text-align: center;
    background-color: var(--bg-color-alt);
    border-color: var(--primary-color);
    border-radius: var(--border-radius);
  }
  
  .nav__menu.active {
    left: 0;
  }
  
  .nav__menu.active ~ .nav__language {
    display: none;
  }
  
  .nav__toggle {
    display: flex;
  }
  
  /* Language selector mobile optimizations */
  .nav__language {
    position: absolute;
    top: 50%;
    right: 60px;
    transform: translateY(-50%);
    order: unset;
    margin-bottom: 0;
  }
  
  .nav__language::before {
    display: none;
  }
  
  .language-selector {
    min-width: 80px;
    padding: 0.5rem 1.5rem 0.5rem 0.75rem;
    font-size: var(--font-size-sm);
    text-align: left;
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-size: 0.75rem;
    background-position: right 0.5rem center;
  }
  
  .nav__toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .nav__toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .nav__toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
  
  .hero__buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .hero__stats {
    justify-content: center;
  }
  
  .download__buttons {
    flex-direction: column;
    align-items: center;
  }

  .controls__grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

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

  .tips__grid {
    grid-template-columns: 1fr;
  }
  
  /* Ensure iframe and media don't overflow */
  .hero__video,
  .hero__iframe,
  iframe {
    width: 100% !important;
    max-width: 100% !important;
  }
  
  .footer__legal {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 0.75rem;
    width: 100%;
    overflow-x: hidden;
  }
  
  /* Ensure text wraps properly */
  * {
    word-wrap: break-word;
    word-break: break-word;
  }
  
  /* 超小屏幕头部优化 */
  .nav__title {
    font-size: 1.125rem;
    max-width: calc(100vw - 140px);
  }
  
  .nav__language {
    right: 50px;
  }
  
  .hero__stats {
    flex-direction: column;
    gap: 1rem;
  }
  
  .download__info {
    flex-direction: column;
    align-items: center;
  }
  
  .features__grid {
    grid-template-columns: 1fr;
  }
  
  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* Extra small screen language selector */
  .language-selector {
    font-size: var(--font-size-sm);
    padding: 0.875rem;
  }
}

/* ===== PLAY ONLINE SECTION ===== */
.play-online {
  padding: var(--section-padding) 0;
  background-color: var(--bg-color);
}

.play-online__warning {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: linear-gradient(135deg, #fff3cd, #ffeaa7);
  border: 1px solid #ffc107;
  border-radius: var(--border-radius);
  padding: 1rem 1.5rem;
  margin: 2rem 0;
  box-shadow: var(--shadow-sm);
}

.warning__icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 0.25rem;
}

.warning__title {
  font-size: var(--font-size-base);
  color: #856404;
  margin: 0 0 0.5rem 0;
  font-weight: 600;
}

.warning__text {
  color: #856404;
  margin: 0;
  line-height: 1.5;
  font-size: var(--font-size-sm);
}

.play-online__game {
  margin: 3rem 0;
  background-color: white;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.game__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
}

.game__title {
  margin: 0;
  font-size: var(--font-size-base);
  font-weight: 600;
}

.game__controls {
  display: flex;
  gap: 0.5rem;
}

.game__fullscreen {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: white;
  padding: 0.5rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  font-size: 1.25rem;
  line-height: 1;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.game__fullscreen:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.05);
}

.game__container {
  position: relative;
  aspect-ratio: 16/9;
  background-color: #f8f9fa;
  overflow: hidden;
}

.game__iframe {
  width: 100%;
  height: 100%;
  border: none;
  background-color: white;
}

.game__loading {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: #f8f9fa;
  z-index: 1;
  transition: opacity 0.5s ease;
  opacity: 0;
  pointer-events: none;
}

.game__loading.loading {
  opacity: 1;
  pointer-events: auto;
}

.loading__spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #e9ecef;
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 1rem;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading__text {
  color: var(--text-color-secondary);
  margin: 0;
  font-size: var(--font-size-sm);
}

.play-online__features {
  margin: 3rem 0;
}

.play-online__features .features__title {
  font-size: var(--font-size-lg);
  text-align: center;
  margin-bottom: 2rem;
  color: var(--text-color);
}

.play-online__features .features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.play-online__features .feature__item {
  text-align: center;
  padding: 1.5rem;
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.play-online__features .feature__item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.play-online__features .feature__icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  height: auto;
}

.play-online__features .feature__name {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin: 0 0 0.5rem 0;
  color: var(--text-color);
}

.play-online__features .feature__desc {
  font-size: var(--font-size-sm);
  color: var(--text-color-secondary);
  margin: 0;
  line-height: 1.5;
}

.play-online__tips {
  margin: 3rem 0;
}

.tips__title {
  font-size: var(--font-size-lg);
  text-align: center;
  margin-bottom: 2rem;
  color: var(--text-color);
}

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

.tip__item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.tip__item:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.tip__icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.tip__text {
  margin: 0;
  color: var(--text-color);
  line-height: 1.5;
}

.play-online__alternatives {
  margin: 3rem 0;
  text-align: center;
  padding: 2rem;
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
}

.alternatives__title {
  font-size: var(--font-size-lg);
  margin: 0 0 1rem 0;
  color: var(--text-color);
}

.alternatives__description {
  color: var(--text-color-secondary);
  margin: 0 0 1.5rem 0;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

/* Responsive Design for Play Online */
@media (max-width: 768px) {
  .play-online__warning {
    flex-direction: column;
    text-align: center;
  }
  
  .game__header {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  .game__title {
    font-size: var(--font-size-sm);
  }
  
  .warning__title {
    font-size: var(--font-size-sm);
  }
  
  .warning__text {
    font-size: var(--font-size-xs);
  }
  
  .play-online__features .features__grid {
    grid-template-columns: 1fr;
  }
  
  .tips__list {
    grid-template-columns: 1fr;
  }
  
  .tip__item {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }
  
  .play-online__alternatives {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .play-online__warning {
    padding: 1rem;
    margin: 1rem 0;
  }
  
  .game__header {
    padding: 1rem;
  }
  
  .game__container {
    aspect-ratio: 4/3;
  }
  
  .loading__spinner {
    width: 30px;
    height: 30px;
    border-width: 3px;
  }
}

/* Fullscreen mode styles */
.game__container.fullscreen-active {
  background-color: #000;
}

.game__container.fullscreen-active .game__iframe {
  width: 100vw !important;
  height: 100vh !important;
}

.game__container.fullscreen-active .game__loading {
  background-color: #000;
  color: white;
}