/* ========== CSS Variables ========== */
:root {
  --vr-blue: #42A5F5;
  --vr-blue-dark: #1E88E5;
  --vr-blue-light: #90CAF9;
  --virtual-purple: #AB47BC;
  --virtual-purple-dark: #8E24AA;
  --virtual-purple-light: #CE93D8;
  --metal-gray: #B0BEC5;
  --metal-gray-dark: #78909C;
  --metal-gray-light: #CFD8DC;
  --pure-white: #FDFDFD;
  --bg-main: #F8F9FC;
  --bg-card: #FFFFFF;
  --bg-alt: #EDF1FA;
  --text-primary: #263238;
  --text-secondary: #546E7A;
  --text-muted: #90A4AE;
  --border-color: #E0E4EC;
  --shadow-sm: 0 2px 8px rgba(66, 165, 245, 0.08);
  --shadow-md: 0 4px 16px rgba(66, 165, 245, 0.12);
  --shadow-lg: 0 8px 32px rgba(171, 71, 188, 0.10);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--vr-blue-dark);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--virtual-purple); }

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

/* ========== Header ========== */
header {
  background: var(--pure-white);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(253, 253, 253, 0.92);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--vr-blue), var(--virtual-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.logo-text {
  background: linear-gradient(135deg, var(--vr-blue-dark), var(--virtual-purple-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

nav a {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

nav a:hover,
nav a.active {
  color: var(--vr-blue-dark);
  background: rgba(66, 165, 245, 0.08);
}

.nav-cta {
  background: linear-gradient(135deg, var(--vr-blue), var(--vr-blue-dark)) !important;
  color: #fff !important;
  font-weight: 600 !important;
  padding: 8px 24px !important;
  border-radius: 24px !important;
  margin-left: 8px;
  box-shadow: 0 2px 12px rgba(66, 165, 245, 0.3);
  transition: all var(--transition-fast) !important;
}

.nav-cta:hover {
  background: linear-gradient(135deg, var(--virtual-purple), var(--virtual-purple-dark)) !important;
  box-shadow: 0 4px 20px rgba(171, 71, 188, 0.35);
  transform: translateY(-1px);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* ========== Hero Section ========== */
.hero {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  min-height: 500px;
  background: linear-gradient(135deg, rgba(66, 165, 245, 0.06), rgba(171, 71, 188, 0.08));
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.35;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(253,253,253,0.4) 0%, rgba(248,249,252,0.95) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
  padding: 80px 24px;
  text-align: center;
}

.hero-tag {
  display: inline-block;
  background: linear-gradient(135deg, rgba(66,165,245,0.12), rgba(171,71,188,0.12));
  color: var(--virtual-purple-dark);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 20px;
  border-radius: 20px;
  margin-bottom: 20px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--vr-blue-dark), var(--virtual-purple-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero h2 {
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 28px;
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition-normal);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--vr-blue), var(--vr-blue-dark));
  color: #fff;
  box-shadow: 0 4px 20px rgba(66, 165, 245, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--virtual-purple), var(--virtual-purple-dark));
  box-shadow: 0 6px 28px rgba(171, 71, 188, 0.4);
  transform: translateY(-2px);
  color: #fff;
}

.btn-outline {
  background: var(--pure-white);
  color: var(--vr-blue-dark);
  border: 2px solid var(--vr-blue-light);
}

.btn-outline:hover {
  border-color: var(--virtual-purple);
  color: var(--virtual-purple-dark);
  transform: translateY(-2px);
}

/* ========== Sections ========== */
section {
  padding: 80px 24px;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.section-header p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

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

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

/* ========== Feature Cards ========== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--vr-blue), var(--virtual-purple));
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

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

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(66,165,245,0.1), rgba(171,71,188,0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========== Screenshot Gallery ========== */
.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.screenshot-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.screenshot-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.screenshot-item img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
}

/* ========== Testimonials ========== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.testimonial-rating {
  color: #FFB300;
  font-size: 1.1rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
  font-style: italic;
}

.testimonial-author {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
}

.testimonial-author span {
  font-weight: 400;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ========== Content Page Layout ========== */
.content-section {
  max-width: 900px;
  margin: 60px auto;
  padding: 0 24px;
}

.content-section h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.content-section h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 32px 0 12px;
  color: var(--text-primary);
  padding-left: 16px;
  border-left: 4px solid var(--vr-blue);
}

.content-section p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 16px;
}

.content-section ul,
.content-section ol {
  margin: 16px 0 24px 24px;
  color: var(--text-secondary);
  line-height: 2;
}

.content-section li {
  font-size: 1rem;
  margin-bottom: 4px;
}

/* ========== Info Cards ========== */
.info-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin: 32px 0;
}

.info-card {
  background: linear-gradient(135deg, rgba(66,165,245,0.04), rgba(171,71,188,0.04));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
}

.info-card-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.info-card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.info-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* ========== Character Cards ========== */
.character-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin: 32px 0;
}

.character-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

.character-card-img {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
  background: linear-gradient(135deg, var(--vr-blue-light), var(--virtual-purple-light));
}

.character-card-body {
  padding: 20px;
}

.character-card-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.character-card-body p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0;
}

.character-tag {
  display: inline-block;
  background: rgba(66,165,245,0.1);
  color: var(--vr-blue-dark);
  font-size: 0.8rem;
  padding: 3px 12px;
  border-radius: 12px;
  margin-top: 10px;
  margin-right: 6px;
}

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

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item.active {
  border-color: var(--vr-blue-light);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  font-family: inherit;
  transition: color var(--transition-fast);
}

.faq-question:hover {
  color: var(--vr-blue-dark);
}

.faq-icon {
  font-size: 1.2rem;
  color: var(--metal-gray);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--vr-blue);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.active .faq-answer {
  max-height: 600px;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ========== CTA Section ========== */
.cta-section {
  text-align: center;
  background: linear-gradient(135deg, rgba(66,165,245,0.06), rgba(171,71,188,0.06));
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.cta-section h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.cta-section p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* ========== Steps / Timeline ========== */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin: 32px 0;
}

.step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--vr-blue), var(--virtual-purple));
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.step h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.step p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ========== Table ========== */
.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.95rem;
}

.info-table th,
.info-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.info-table th {
  background: rgba(66,165,245,0.05);
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  width: 160px;
}

.info-table td {
  color: var(--text-secondary);
}

/* ========== Highlight Box ========== */
.highlight-box {
  background: linear-gradient(135deg, rgba(66,165,245,0.06), rgba(171,71,188,0.06));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin: 32px 0;
}

.highlight-box h3 {
  margin-top: 0;
  margin-bottom: 12px;
}

.highlight-box p {
  margin-bottom: 0;
}

/* ========== Plugin Grid ========== */
.plugin-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 32px 0;
}

.plugin-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  border-left: 4px solid var(--vr-blue);
  transition: all var(--transition-fast);
}

.plugin-card:hover {
  box-shadow: var(--shadow-md);
  border-left-color: var(--virtual-purple);
}

.plugin-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.plugin-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0;
  line-height: 1.7;
}

/* ========== Utility Classes ========== */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-2 { margin-top: 32px; }
.mb-2 { margin-bottom: 32px; }

/* ========== Lightbox ========== */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.92);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.lightbox.active {
  display: flex;
}

.lightbox img {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 48px rgba(0,0,0,0.5);
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 28px;
  font-size: 2rem;
  color: #fff;
  cursor: pointer;
  background: none;
  border: none;
  font-family: inherit;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.lightbox-close:hover { opacity: 1; }

.lightbox-prev,
.lightbox-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 2rem;
  color: #fff;
  cursor: pointer;
  background: rgba(255,255,255,0.1);
  border: none;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
  font-family: inherit;
}

.lightbox-prev:hover,
.lightbox-next:hover {
  background: rgba(255,255,255,0.25);
}

.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }

/* ========== Footer ========== */
footer {
  background: var(--pure-white);
  border-top: 1px solid var(--border-color);
  padding: 24px;
  text-align: center;
  margin-top: auto;
}

footer p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ========== Hero per page ========== */
.hero-home .hero-bg { background-image: url('../img/header.png'); }
.hero-guide .hero-bg { background-image: url('../img/screenshot-01.png'); }
.hero-story .hero-bg { background-image: url('../img/screenshot-03.png'); }
.hero-characters .hero-bg { background-image: url('../img/screenshot-02.png'); }
.hero-faq .hero-bg { background-image: url('../img/header.png'); }

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .header-inner { height: 60px; }
  nav {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--pure-white);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    display: none;
    gap: 4px;
  }
  nav.open { display: flex; }
  nav a { width: 100%; justify-content: center; }
  .nav-cta { margin-left: 0; width: 100%; }
  .hamburger { display: flex; }

  .hero-content { padding: 48px 20px; }
  .hero h1 { font-size: 2rem; }
  .hero h2 { font-size: 0.95rem; }
  .hero { min-height: 380px; }

  section { padding: 48px 20px; }
  .section-header h2 { font-size: 1.6rem; }
  .features-grid,
  .testimonials-grid,
  .character-grid,
  .plugin-grid,
  .info-cards,
  .steps { grid-template-columns: 1fr; }

  .screenshot-grid { grid-template-columns: 1fr; }
  .content-section h2 { font-size: 1.6rem; }
  .content-section h3 { font-size: 1.15rem; }
  .btn { padding: 12px 24px; font-size: 0.95rem; }
  .info-table { font-size: 0.85rem; }
  .info-table th, .info-table td { padding: 10px 12px; }
  .info-table th { width: 100px; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.6rem; }
  .hero { min-height: 320px; }
  .hero-content { padding: 36px 16px; }
  .hero-tag { font-size: 0.75rem; padding: 4px 14px; }
  section { padding: 36px 16px; }
  .section-header h2 { font-size: 1.4rem; }
  .feature-card { padding: 24px 20px; }
  .btn { padding: 10px 20px; font-size: 0.9rem; }
}