/* ===== Reset & Base ===== */
*, *::before, *::after {
  margin: 0; padding: 0; box-sizing: border-box;
}
html { scroll-behavior: smooth; }
body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: #1a1a2e; background: #ffffff; line-height: 1.7; overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ===== Variables ===== */
:root {
  --primary: #1a3a6b;
  --primary-light: #2a5a9e;
  --primary-dark: #0f1f3d;
  --accent: #e8a838;
  --accent-light: #f0c060;
  --gradient-main: linear-gradient(135deg, #0f1f3d 0%, #1a3a6b 40%, #2a5a9e 100%);
  --gradient-accent: linear-gradient(135deg, #e8a838 0%, #f0c060 100%);
  --text-dark: #1a1a2e;
  --text-mid: #4a4a6a;
  --text-light: #8a8aaa;
  --bg-light: #f5f7fc;
  --bg-card: #ffffff;
  --radius: 16px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.08);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.10);
  --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ===== Container ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== Navbar ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 16px 0; transition: var(--transition);
  background: transparent;
}
.navbar.scrolled { background: rgba(255,255,255,0.95); backdrop-filter: blur(20px); box-shadow: 0 1px 20px rgba(0,0,0,0.08); padding: 10px 0; }
.navbar.scrolled .logo-text { color: var(--primary); }
.navbar.scrolled .logo-icon { color: var(--accent); }
.navbar.scrolled .nav-link { color: var(--text-mid); }
.navbar.scrolled .nav-link:hover, .navbar.scrolled .nav-link.active { color: var(--primary); }
.nav-container { display: flex; align-items: center; justify-content: space-between; }

.logo { display: flex; align-items: center; gap: 8px; }
.logo-icon { font-size: 24px; color: var(--accent); }
.logo-text { font-size: 20px; font-weight: 700; color: #fff; letter-spacing: 1px; transition: var(--transition); }
.logo-text small { font-weight: 300; font-size: 14px; margin-left: 2px; color: rgba(255,255,255,0.7); }
.navbar.scrolled .logo-text small { color: var(--text-light); }

.nav-menu { display: flex; gap: 8px; }
.nav-link {
  padding: 8px 18px; border-radius: 8px; font-size: 14px; font-weight: 500;
  color: rgba(255,255,255,0.8); transition: var(--transition); position: relative;
}
.nav-link:hover, .nav-link.active { color: #fff; background: rgba(255,255,255,0.1); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: var(--transition); }
.navbar.scrolled .nav-toggle span { background: var(--text-dark); }

/* ===== Hero ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center; position: relative;
  background: var(--gradient-main); overflow: hidden; padding-top: 80px;
}
.hero-bg { position: absolute; inset: 0; overflow: hidden; }
.hero-bg::before {
  content: ''; position: absolute; width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(232,168,56,0.08) 0%, transparent 70%);
  top: -200px; right: -200px; border-radius: 50%;
}
.hero-bg::after {
  content: ''; position: absolute; width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(42,90,158,0.15) 0%, transparent 70%);
  bottom: -100px; left: -100px; border-radius: 50%;
}

.hero-content { position: relative; z-index: 2; text-align: center; padding: 80px 0 60px; }
.hero-badge {
  display: inline-block; padding: 6px 20px; border-radius: 20px;
  background: rgba(232,168,56,0.15); color: var(--accent); font-size: 13px;
  font-weight: 500; letter-spacing: 2px; margin-bottom: 24px;
  border: 1px solid rgba(232,168,56,0.25);
}
.hero-title {
  font-size: clamp(40px, 8vw, 80px); font-weight: 900; color: #fff;
  line-height: 1.1; margin-bottom: 20px; letter-spacing: 4px;
}
.hero-subtitle {
  font-size: clamp(16px, 2.5vw, 22px); color: rgba(255,255,255,0.7);
  font-weight: 300; max-width: 600px; margin: 0 auto 36px; line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 60px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 14px 36px;
  border-radius: 50px; font-size: 15px; font-weight: 600; border: none;
  cursor: pointer; transition: var(--transition); letter-spacing: 0.5px;
}
.btn-primary { background: var(--gradient-accent); color: var(--primary-dark); box-shadow: 0 4px 20px rgba(232,168,56,0.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(232,168,56,0.4); }
.btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.3); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-full { width: 100%; justify-content: center; }

.hero-stats { display: flex; gap: 60px; justify-content: center; flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-num { font-size: 48px; font-weight: 800; color: #fff; line-height: 1; }
.stat-suffix { font-size: 28px; font-weight: 700; color: var(--accent); }
.stat-label { display: block; font-size: 13px; color: rgba(255,255,255,0.5); margin-top: 6px; letter-spacing: 1px; }

.scroll-indicator {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: rgba(255,255,255,0.3); font-size: 11px; letter-spacing: 2px;
  animation: fadeInOut 2s ease-in-out infinite;
}
.scroll-arrow { width: 2px; height: 30px; background: rgba(255,255,255,0.3); position: relative; overflow: hidden; }
.scroll-arrow::after { content: ''; position: absolute; top: -100%; left: 0; width: 100%; height: 100%; background: var(--accent); animation: scrollLine 2s ease-in-out infinite; }
@keyframes scrollLine { 0% { top: -100%; } 100% { top: 100%; } }
@keyframes fadeInOut { 0%,100% { opacity: 0.5; } 50% { opacity: 1; } }

/* ===== Particles ===== */
.particles { position: absolute; inset: 0; }
.particle {
  position: absolute; width: 4px; height: 4px; background: rgba(255,255,255,0.15);
  border-radius: 50%; animation: float linear infinite;
}
@keyframes float {
  0% { transform: translateY(100vh) scale(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-10vh) scale(1); opacity: 0; }
}

/* ===== Section Common ===== */
.section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
  display: inline-block; padding: 4px 16px; border-radius: 4px;
  background: rgba(26,58,107,0.08); color: var(--primary); font-size: 12px;
  font-weight: 600; letter-spacing: 3px; margin-bottom: 16px; text-transform: uppercase;
}
.section-title {
  font-size: clamp(28px, 4vw, 40px); font-weight: 800; color: var(--text-dark);
  line-height: 1.2; margin-bottom: 16px;
}
.section-desc {
  font-size: 16px; color: var(--text-light); max-width: 560px; margin: 0 auto; line-height: 1.8;
}
.highlight { color: var(--primary); font-weight: 600; }

/* ===== About ===== */
.about { background: var(--bg-light); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text p { font-size: 15px; color: var(--text-mid); line-height: 1.9; margin-bottom: 16px; }

.about-mission { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; margin-top: 32px; }
.mission-item {
  background: #fff; padding: 20px; border-radius: var(--radius); text-align: center;
  box-shadow: var(--shadow-sm); transition: var(--transition);
}
.mission-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.mission-icon { font-size: 28px; display: block; margin-bottom: 8px; }
.mission-item h4 { font-size: 14px; font-weight: 700; margin-bottom: 6px; }
.mission-item p { font-size: 12px; color: var(--text-light); line-height: 1.5; margin: 0; }

.about-card-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
.acard {
  background: rgba(26,58,107,0.06); padding: 24px 16px; border-radius: var(--radius);
  text-align: center; font-size: 13px; font-weight: 500; color: var(--text-mid);
  transition: var(--transition); cursor: default; backdrop-filter: blur(10px);
  border: 1px solid rgba(26,58,107,0.08);
}
.acard:hover { background: var(--primary); color: #fff; transform: translateY(-4px); box-shadow: var(--shadow-md); }
.acard-icon { display: block; font-size: 28px; margin-bottom: 8px; }
.acard:nth-child(1) { background: rgba(232,168,56,0.1); border-color: rgba(232,168,56,0.2); }
.acard:nth-child(4) { background: rgba(42,90,158,0.1); border-color: rgba(42,90,158,0.2); }
.acard:nth-child(5) { background: rgba(232,168,56,0.1); border-color: rgba(232,168,56,0.2); }

/* ===== Cards (Assets) ===== */
.cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.card {
  background: #fff; border-radius: var(--radius); padding: 36px 28px;
  box-shadow: var(--shadow-sm); border: 1px solid rgba(0,0,0,0.04);
  transition: var(--transition); position: relative; overflow: hidden;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--gradient-main); transform: scaleX(0); transform-origin: left;
  transition: transform 0.6s ease;
}
.card:hover::before { transform: scaleX(1); }
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.card-icon { font-size: 40px; margin-bottom: 16px; }
.card-title { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.card-desc { font-size: 14px; color: var(--text-mid); line-height: 1.8; margin-bottom: 16px; }
.card-features { display: flex; flex-direction: column; gap: 8px; }
.card-features li {
  font-size: 13px; color: var(--text-light); padding-left: 20px; position: relative;
}
.card-features li::before { content: '→'; position: absolute; left: 0; color: var(--accent); font-weight: 600; }

/* ===== Tech ===== */
.tech { background: var(--bg-light); }
.tech-showcase { display: flex; flex-direction: column; gap: 24px; }
.tech-item {
  background: #fff; border-radius: var(--radius); padding: 40px;
  box-shadow: var(--shadow-sm); border: 1px solid rgba(0,0,0,0.04); transition: var(--transition);
}
.tech-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.tech-item.featured {
  background: var(--gradient-main); color: #fff; padding: 48px 40px;
  position: relative; overflow: hidden;
}
.tech-item.featured::before {
  content: ''; position: absolute; width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(232,168,56,0.1) 0%, transparent 70%);
  top: -200px; right: -200px; border-radius: 50%;
}
.tech-label {
  display: inline-block; padding: 4px 14px; border-radius: 4px;
  background: rgba(232,168,56,0.2); color: var(--accent); font-size: 11px;
  font-weight: 600; letter-spacing: 2px; margin-bottom: 16px;
}
.tech-content { position: relative; z-index: 1; }
.tech-icon-big { margin-bottom: 16px; }
.ti-logo { display: flex; align-items: center; gap: 10px; font-size: 28px; font-weight: 700; }
.ti-symbol { color: var(--accent); }
.ti-icon { font-size: 36px; }
.tech-item.featured h3 { font-size: 26px; font-weight: 700; margin-bottom: 12px; }
.tech-item.featured p { font-size: 15px; color: rgba(255,255,255,0.7); max-width: 600px; margin-bottom: 16px; }
.tech-item:not(.featured) h3 { font-size: 22px; font-weight: 700; margin-bottom: 12px; }
.tech-item:not(.featured) p { font-size: 14px; color: var(--text-mid); line-height: 1.8; margin-bottom: 16px; }
.tech-item:not(.featured) .tech-icon-big .ti-icon { color: var(--primary); }

.tech-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tech-tags span {
  padding: 6px 14px; border-radius: 20px; font-size: 12px; font-weight: 500;
  background: rgba(26,58,107,0.08); color: var(--primary);
}
.tech-item.featured .tech-tags span { background: rgba(255,255,255,0.1); color: rgba(255,255,255,0.85); }

.tech-row { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

.tech-content a { color: var(--accent-light); text-decoration: underline; text-underline-offset: 2px; }
.tech-content a:hover { color: #fff; }

/* ===== Strength ===== */
.strength-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 32px; }
.s-item { text-align: center; padding: 40px 24px; }
.s-num {
  font-size: 48px; font-weight: 800; color: rgba(26,58,107,0.08); line-height: 1;
  margin-bottom: 12px; font-family: 'Inter', sans-serif;
}
.s-item h4 { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.s-item p { font-size: 14px; color: var(--text-mid); line-height: 1.8; }

/* ===== Contact ===== */
.contact { background: var(--bg-light); }
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; }
.cinfo-item { display: flex; gap: 16px; align-items: flex-start; margin-bottom: 28px; }
.cinfo-icon { font-size: 24px; width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; background: #fff; border-radius: 12px; box-shadow: var(--shadow-sm); }
.cinfo-item h4 { font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.cinfo-item p { font-size: 14px; color: var(--text-light); }

.contact-form {
  background: #fff; padding: 36px; border-radius: var(--radius); box-shadow: var(--shadow-md);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-form input, .contact-form select, .contact-form textarea {
  width: 100%; padding: 14px 16px; border: 1px solid #e8e8f0; border-radius: 10px;
  font-size: 14px; font-family: inherit; background: var(--bg-light);
  transition: var(--transition); outline: none; margin-bottom: 16px;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus {
  border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,58,107,0.1);
}

/* ===== Footer ===== */
.footer { background: var(--primary-dark); color: rgba(255,255,255,0.7); padding: 60px 0 0; }
.footer-content { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 40px; }
.footer-brand .logo-text { color: #fff; }
.footer-brand .logo-text small { color: rgba(255,255,255,0.5); }
.footer-brand p { font-size: 13px; margin-top: 8px; }
.footer-links { display: flex; gap: 60px; }
.flink-group h4 { font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 16px; }
.flink-group a { display: block; font-size: 13px; color: rgba(255,255,255,0.5); margin-bottom: 8px; transition: var(--transition); }
.flink-group a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom { margin-top: 48px; border-top: 1px solid rgba(255,255,255,0.06); padding: 20px 0; text-align: center; }
.footer-bottom p { font-size: 12px; color: rgba(255,255,255,0.3); }

/* ===== Animations on scroll ===== */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 968px) {
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-card-grid { grid-template-columns: 1fr 1fr 1fr; }
  .tech-row { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    position: fixed; top: 0; right: -100%; width: 280px; height: 100vh;
    background: #fff; flex-direction: column; padding: 80px 24px 24px;
    box-shadow: -10px 0 40px rgba(0,0,0,0.1); transition: right 0.4s ease; gap: 4px;
    align-items: stretch;
  }
  .nav-menu.open { right: 0; }
  .nav-link { color: var(--text-dark) !important; padding: 12px 16px; border-radius: 8px; font-size: 15px; }
  .nav-link:hover, .nav-link.active { background: var(--bg-light); color: var(--primary) !important; }

  .nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  .hero-stats { gap: 30px; }
  .stat-num { font-size: 36px; }
  .stat-suffix { font-size: 20px; }

  .about-mission { grid-template-columns: 1fr; }
  .about-card-grid { grid-template-columns: 1fr 1fr; }
  .tech-item.featured { padding: 32px 24px; }
  .tech-item { padding: 28px 24px; }
  .footer-content { flex-direction: column; }
  .footer-links { gap: 30px; }
  .contact-form { padding: 24px; }
  .form-row { grid-template-columns: 1fr; }
  .section { padding: 60px 0; }
}

@media (max-width: 480px) {
  .about-card-grid { grid-template-columns: 1fr 1fr; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
}