/* Main Stylesheet */

/* Paper Textures */
body {
  background-color: var(--kraft-paper);
  background-image: 
    radial-gradient(ellipse at 10% 20%, rgba(0,0,0,0.02) 0%, transparent 50%),
    radial-gradient(ellipse at 90% 80%, rgba(0,0,0,0.02) 0%, transparent 50%),
    repeating-linear-gradient(45deg, transparent, transparent 2px, rgba(0,0,0,0.02) 2px, rgba(0,0,0,0.02) 4px);
}

/* Horizontal Lines Paper - 横线信纸虚线 */
.paper-horizontal {
  position: relative;
}

.paper-horizontal::before {
  content: '';
  position: absolute;
  top: 30px;
  left: 0;
  right: 0;
  height: calc(100% - 30px);
  background: 
    repeating-linear-gradient(
      90deg,
      rgba(150, 150, 150, 0.5) 0px,
      rgba(150, 150, 150, 0.5) 2px,
      transparent 2px,
      transparent 8px
    );
  background-size: 8px 1px;
  background-position: 0 0;
  background-repeat: repeat;
  -webkit-mask-image: repeating-linear-gradient(
    to bottom,
    black 0px,
    black 1px,
    transparent 1px,
    transparent 30px
  );
  mask-image: repeating-linear-gradient(
    to bottom,
    black 0px,
    black 1px,
    transparent 1px,
    transparent 30px
  );
  pointer-events: none;
  z-index: 0;
}

/* Vertical Lines Paper - 竖线信纸虚线 */
.paper-vertical {
  position: relative;
  background: 
    repeating-linear-gradient(
      0deg,
      rgba(150, 150, 150, 0.3) 0px,
      rgba(150, 150, 150, 0.3) 8px,
      transparent 8px,
      transparent 16px
    ),
    repeating-linear-gradient(
      90deg,
      transparent 0px,
      transparent 39px,
      rgba(150, 150, 150, 0) 40px
    );
  background-size: 1px 16px, auto 40px;
  background-position: 39px 0, 0 0;
  background-repeat: repeat;
}

/* Small Grid Paper - 小网格 */
.paper-small-grid {
  position: relative;
}

.paper-small-grid::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    repeating-linear-gradient(0deg, transparent, transparent 19px, rgba(150, 150, 150, 0.25) 19px, rgba(150, 150, 150, 0.25) 20px),
    repeating-linear-gradient(90deg, transparent, transparent 19px, rgba(150, 150, 150, 0.25) 19px, rgba(150, 150, 150, 0.25) 20px);
  pointer-events: none;
  z-index: 0;
}

/* Tian Zi Ge Paper - 田字格 */
.paper-tian-zi {
  position: relative;
}

.paper-tian-zi::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    repeating-linear-gradient(0deg, transparent, transparent 49px, rgba(150, 150, 150, 0.4) 49px, rgba(150, 150, 150, 0.4) 50px),
    repeating-linear-gradient(90deg, transparent, transparent 49px, rgba(150, 150, 150, 0.4) 49px, rgba(150, 150, 150, 0.4) 50px),
    repeating-linear-gradient(0deg, transparent, transparent 24px, rgba(150, 150, 150, 0.2) 24px, rgba(150, 150, 150, 0.2) 25px),
    repeating-linear-gradient(90deg, transparent, transparent 24px, rgba(150, 150, 150, 0.2) 24px, rgba(150, 150, 150, 0.2) 25px);
  pointer-events: none;
  z-index: 0;
}

/* Large Grid Paper - 大网格笔记 */
.paper-large-grid {
  position: relative;
}

.paper-large-grid::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    repeating-linear-gradient(0deg, transparent, transparent 49px, rgba(150, 150, 150, 0.3) 49px, rgba(150, 150, 150, 0.3) 50px),
    repeating-linear-gradient(90deg, transparent, transparent 49px, rgba(150, 150, 150, 0.3) 49px, rgba(150, 150, 150, 0.3) 50px);
  pointer-events: none;
  z-index: 0;
}

/* Ensure content is above paper texture */
.paper-horizontal > *,
.paper-vertical > *,
.paper-small-grid > *,
.paper-tian-zi > *,
.paper-large-grid > * {
  position: relative;
  z-index: 1;
}

/* Container */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  transition: all 0.3s ease;
}

.navbar.scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  max-width: var(--container-width);
  margin: 0 auto;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: bold;
  color: var(--black);
}

.nav-logo img {
  height: 40px;
  width: auto;
}

.nav-menu {
  display: flex;
  gap: 40px;
  align-items: center;
}

.nav-link {
  color: var(--black);
  font-weight: 500;
  transition: color 0.3s ease;
}

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

.nav-cta {
  background: var(--red-accent);
  color: var(--white);
  padding: 10px 24px;
  border-radius: 6px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.nav-cta:hover {
  background: #B71C1C;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(211, 47, 47, 0.3);
}

/* Hero Section */
.hero {
  padding: 120px 20px 80px;
  background: 
    linear-gradient(135deg, rgba(212, 165, 116, 0.7) 0%, rgba(232, 215, 195, 0.7) 100%),
    url('../images/kraft-texture.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0,0,0,0.02) 2px, rgba(0,0,0,0.02) 4px),
    repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(0,0,0,0.02) 2px, rgba(0,0,0,0.02) 4px);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.scene-intro {
  position: relative;
  z-index: 2;
}

.hero h1 {
  font-size: 56px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--black);
}

.hero-highlight {
  color: var(--red-accent);
}

.hero p {
  font-size: 20px;
  margin-bottom: 30px;
  color: var(--gray-900);
}

/* 情景导入 */
.scene-intro {
  margin: 40px 0;
  padding: 30px;
  background: rgba(255, 255, 255, 0.85);
  border-radius: 12px;
  border-left: 5px solid var(--red-accent);
  position: relative;
  z-index: 2;
}

.scene-intro .quote {
  font-size: 22px;
  font-style: italic;
  color: var(--black);
  margin-bottom: 15px;
  line-height: 1.6;
  font-weight: 600;
}

.scene-intro .subtext {
  font-size: 16px;
  color: var(--gray-600);
  margin: 0;
  line-height: 1.5;
}

.hero-flow {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.flow-step {
  background: var(--white);
  padding: 20px 30px;
  border-radius: 8px;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.flow-arrow {
  font-size: 24px;
  color: var(--red-accent);
  font-weight: bold;
}

/* Core Logic Section */
.core-logic {
  padding: var(--section-padding);
  background: var(--white);
}

.section-title {
  text-align: center;
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 60px;
  color: var(--black);
}

.logic-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
  max-width: 1000px;
  margin: 0 auto;
}

.logic-card {
  background: linear-gradient(135deg, var(--kraft-light) 0%, #F5EBE0 100%);
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
}

.logic-card:hover {
  transform: translateY(-5px);
}

.logic-card h3 {
  font-size: 28px;
  margin-bottom: 20px;
  color: var(--red-accent);
  display: flex;
  align-items: center;
  gap: 10px;
}

.logic-steps {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.logic-step {
  background: var(--white);
  padding: 15px 20px;
  border-radius: 8px;
  border-left: 4px solid var(--red-accent);
}

.logic-step strong {
  color: var(--black);
  display: block;
  margin-bottom: 5px;
}

.logic-step span {
  color: var(--gray-600);
  font-size: 14px;
}

/* Product Matrix */
.products {
  padding: var(--section-padding);
  background: var(--gray-100);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.product-card {
  background: var(--white);
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  position: relative;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.product-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.badge-live {
  background: var(--red-accent);
  color: var(--white);
}

.badge-dev {
  background: #FFA000;
  color: var(--white);
}

.badge-planned {
  background: var(--gray-300);
  color: var(--gray-900);
}

.product-card h3 {
  font-size: 24px;
  margin-bottom: 15px;
  color: var(--black);
}

.product-card p {
  color: var(--gray-600);
  line-height: 1.8;
}

/* CTA Section */
.cta-section {
  padding: var(--section-padding);
  background: linear-gradient(135deg, var(--gray-900) 0%, var(--black) 100%);
  text-align: center;
  color: var(--white);
}

.cta-section h2 {
  font-size: 42px;
  margin-bottom: 20px;
}

.cta-section p {
  font-size: 18px;
  margin-bottom: 40px;
  color: var(--gray-200);
}

.cta-button {
  display: inline-block;
  background: var(--red-accent);
  color: var(--white);
  padding: 18px 48px;
  border-radius: 8px;
  font-size: 18px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.cta-button:hover {
  background: #B71C1C;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(211, 47, 47, 0.4);
}

/* About Section */
.about {
  padding: var(--section-padding);
  background: var(--white);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text h2 {
  font-size: 42px;
  margin-bottom: 24px;
  color: var(--black);
}

.about-text p {
  font-size: 18px;
  line-height: 1.8;
  color: var(--gray-600);
  margin-bottom: 20px;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.stat-card {
  background: linear-gradient(135deg, var(--kraft-light) 0%, #F5EBE0 100%);
  padding: 30px;
  border-radius: 12px;
  text-align: center;
}

.stat-number {
  font-size: 48px;
  font-weight: 700;
  color: var(--red-accent);
  display: block;
  margin-bottom: 10px;
}

.stat-label {
  font-size: 16px;
  color: var(--gray-600);
}

/* Contact Section */
.contact {
  padding: var(--section-padding);
  background: var(--gray-100);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-top: 40px;
}

.contact-item {
  text-align: center;
}

.contact-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.contact-item h3 {
  font-size: 20px;
  margin-bottom: 10px;
  color: var(--black);
}

.contact-item p {
  color: var(--gray-600);
  font-size: 16px;
}

.contact-item a {
  color: var(--red-accent);
  font-weight: 600;
}

/* Footer */
.footer {
  background: var(--black);
  color: var(--white);
  padding: 40px 20px;
  text-align: center;
}

.footer p {
  margin-bottom: 10px;
}

.footer a {
  color: var(--red-accent);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    gap: 20px;
  }
  
  .hero h1 {
    font-size: 36px;
  }
  
  .hero p {
    font-size: 16px;
  }
  
  .section-title {
    font-size: 32px;
  }
  
  .logic-container {
    grid-template-columns: 1fr;
  }
  
  .about-content {
    grid-template-columns: 1fr;
  }
  
  .about-stats {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .nav-menu {
    flex-direction: column;
    gap: 10px;
  }
  
  .hero h1 {
    font-size: 28px;
  }
  
  .hero-flow {
    flex-direction: column;
  }
  
  .product-grid {
    grid-template-columns: 1fr;
  }
}