@charset "utf-8";

/* Reset */
* {
    margin-top: 0;
    margin-right: 0;
    margin-left: 0;
    margin-bottom: 0;
    padding: 0;
    box-sizing: border-box;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  overflow-x: hidden;
  background: linear-gradient(135deg, #0f0f0f 0%, #1a1a2e 100%);
  color: #fff;
}

/* Section */
.section {
  min-height: 100vh;
  width: 100%;
  display: block;
}


/* Header */
.header {
  position: fixed;
  inset: 0 0 auto 0;
  height: 80px;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  transition: all 0.3s ease;
}

.header.scrolled {
  background: rgba(0, 0, 0, 0.95);
  height: 70px;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.3s ease;
}

.logo-container:hover { transform: translateY(-2px); }

.logo {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo svg { width: 100%; height: 100%; }

.logo-text {
  color: #fff;
  font-size: 36px;
  font-weight: 600;
  letter-spacing: -0.5px;
}

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

.menu-item {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
  padding: 8px 0;
}

.menu-item:hover {
  color: #fff;
  transform: translateY(-2px);
}

.menu-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #667eea, #764ba2);
  transition: width 0.3s ease;
}

.menu-item:hover::after { width: 100%; }

.menu-item.active { color: #fff; }
.menu-item.active::after { width: 100%; }

/* intro layout */
.intro-content {
    max-width: 1400px;
    margin-right: auto;
    margin-left: auto;
    padding-top: px;
    padding-right: px;
    padding-left: px;
    padding-bottom: px;
    margin-top: 0px;
}

.intro-header {
    text-align: center;
    margin-bottom: 80px;
    padding-top: 60px; /* space under fixed header */
    margin-top: 60px;
}

.intro-header h2 {
    font-size: 48px;
    margin-bottom: 20px;
    margin-above: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-top: 0px;
}

.intro-header p {
  font-size: 20px;
  color: rgba(255, 255, 255, 0.8);
  max-width: 950px; /* Text width */
  margin: 0 auto;
  line-height: 1.8;
  text-align: left;
}

/* Two-column section: photo left, focus list right */
.intro-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  margin-bottom: 80px;
}

.intro-visual {
  position: relative;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.showcase-display {
  position: relative;
  width: 100%;
  max-width: 500px;
  height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.showcase-main {
  position: relative;
  width: 350px;
  height: 400px;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
  border-radius: 30px;
  border: 2px solid rgba(255, 255, 255, 0.1);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
}

.showcase-main img {
  max-width: 100%;
  max-height: 100%;
  border-radius: 12px;
  object-fit: cover;
}

/* Corner decoration */
.corner-decoration {
  position: absolute;
  width: 80px;
  height: 80px;
  border: 2px solid rgba(102, 126, 234, 0.3);
}

.corner-decoration.top-left {
  top: -20px;
  left: -20px;
  border-right: none;
  border-bottom: none;
  border-radius: 20px 0 0 0;
}

.corner-decoration.bottom-right {
  bottom: -20px;
  right: -20px;
  border-left: none;
  border-top: none;
  border-radius: 0 0 20px 0;
}

/* Focus list */
.intro-info { padding-left: 40px; }

.intro-info h3 {
  font-size: 36px;
  margin-bottom: 30px;
  line-height: 1.3;
  text-align: left;
}

.feature-list {
  list-style: none;
  margin-bottom: 40px;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  margin-bottom: 20px;
  font-size: 16px;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.6;
}

.feature-list li::before {
  content: '\25B6'; 
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 50%;
  flex-shrink: 0;
}

/* Scroll to top button (your screenshot needs it to appear once scrolled) */
.scroll-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 50%;
  border: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  transform: translateY(100px);
  transition: all 0.3s ease;
  z-index: 999;
}

.scroll-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.scroll-to-top:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(102, 126, 234, 0.5);
}

/* Responsive */
@media (max-width: 1024px) {
  .intro-main {
    grid-template-columns: 1fr;
    gap: 60px;
  }

  .intro-visual { height: 400px; }

  .intro-info {
    padding-left: 0;
    text-align: center;
  }

  .intro-info h3 { text-align: center; }

  .feature-list {
    text-align: left;
    max-width: 700px;
    margin: 0 auto 40px;
  }
}

@media (max-width: 768px) {
  .header { padding: 0 20px; }

  .logo-text { font-size: 20px; }

  .intro-header h2 { font-size: 36px; }

  .intro-info h3 { font-size: 28px; }

  .showcase-display {
    max-width: 350px;
    height: 400px;
  }

  .showcase-main {
    width: 100%;
    height: 350px;
    padding: 30px;
  }

  .corner-decoration { display: none; }
}

@media (max-width: 480px) {
  .header { height: 70px; padding: 0 15px; }
  .header.scrolled { height: 60px; }

  .logo { width: 40px; height: 40px; }
  .logo-text { font-size: 18px; }

  .intro-content { padding: 20px; }
  .intro-header { margin-bottom: 50px; }
  .intro-header p { font-size: 16px; }
}

#tfc {
  background: linear-gradient(135deg, #0f0f0f 0%, #1a1a2e 100%);
}

/* tfc layout */

.tfc-content {
    max-width: 1400px;
    margin: 0 auto;
}

.tfc-header {
    text-align: center;
    margin-bottom: 80px;
    padding-top: 40px; /* space under fixed header */
    margin-top: 20px;
}

.tfc-header h2 {
    font-size: 48px;
    margin-bottom: 20px;
    margin-above: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-top: 0px;
}

.tfc-header p {
  font-size: 20px;
  color: rgba(255, 255, 255, 0.8);
  max-width: 950px; /* Text width */
  margin: 0 auto;
  line-height: 1.8;
  text-align: left;
}

/* Two-column section: photo left, focus list right */
.tfc-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  margin-bottom: 80px;
}

.tfc-visual {
  position: relative;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Focus list */
.tfc-info { padding-left: 40px; }

.tfc-info h3 {
  font-size: 36px;
  margin-bottom: 30px;
  line-height: 1.3;
  text-align: left;
}

/* Responsive */
@media (max-width: 1024px) {
  .tfc-main {
    grid-template-columns: 1fr;
    gap: 60px;
  }

  .tfc-visual { height: 400px; }

  .tfc-info {
    padding-left: 0;
    text-align: center;
  }

  .tfc-info h3 { text-align: center; }

  .feature-list {
    text-align: left;
    max-width: 700px;
    margin: 0 auto 40px;
  }
}

@media (max-width: 768px) {
  .header { padding: 0 20px; }

  .logo-text { font-size: 20px; }

  .tfc-header h2 { font-size: 36px; }

  .tfc-info h3 { font-size: 28px; }
}
  
@media (max-width: 480px) {
  .header { height: 70px; padding: 0 15px; }
  .header.scrolled { height: 60px; }

  .logo { width: 40px; height: 40px; }
  .logo-text { font-size: 18px; }

  .tfc-content { padding: 20px; }
  .tfc-header { margin-bottom: 50px; }
  .tfc-header p { font-size: 16px; }
}