/* ===== CSS Variables ===== */
:root {
  --primary: #1A365D;
  --primary-light: #2C5282;
  --secondary: #2B6CB0;
  --accent: #38B2AC;
  --accent-light: #4FD1C5;
  --bg-white: #FFFFFF;
  --bg-light: #F7FAFC;
  --bg-dark: #1A202C;
  --text-dark: #1A202C;
  --text-gray: #4A5568;
  --text-light: #718096;
  --text-white: #FFFFFF;
  --border: #E2E8F0;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text-dark);
  background: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}

.header.scrolled {
  padding: 10px 0;
  background: rgba(255, 255, 255, 0.98);
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.02em;
}

.logo img {
  height: 36px;
  width: auto;
}

.logo-dot {
  color: var(--accent);
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-gray);
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transition: width var(--transition);
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-links a:hover::after {
  width: 100%;
}

/* Language Switcher */
.lang-switch {
  display: flex;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  font-size: 0.8rem;
  font-weight: 600;
}

.lang-switch button {
  border: none;
  background: transparent;
  padding: 5px 10px;
  cursor: pointer;
  color: var(--text-light);
  transition: all var(--transition);
  font-weight: 600;
  font-family: inherit;
}

.lang-switch button.active {
  background: var(--primary);
  color: var(--text-white);
}

.lang-switch button:hover:not(.active) {
  background: var(--bg-light);
  color: var(--primary);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  border: none;
  background: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: all var(--transition);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Hero Section ===== */
.hero {
  padding: 160px 0 100px;
  background: linear-gradient(135deg, var(--bg-white) 0%, var(--bg-light) 50%, #EBF4FF 100%);
  position: relative;
  overflow: hidden;
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(56, 178, 172, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(43, 108, 176, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 60px;
}

.hero-content {
  flex: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(56, 178, 172, 0.1);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
}

.hero-badge svg {
  width: 16px;
  height: 16px;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--primary);
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero h1 .highlight {
  color: var(--accent);
  position: relative;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-gray);
  line-height: 1.8;
  max-width: 520px;
  margin-bottom: 32px;
}

.hero-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-visual {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-illustration {
  width: 100%;
  max-width: 460px;
  aspect-ratio: 1;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: 0 20px 60px rgba(26, 54, 93, 0.2);
}

.hero-illustration::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 32px;
  background: linear-gradient(135deg, var(--accent), var(--secondary));
  z-index: -1;
  opacity: 0.4;
  filter: blur(20px);
}

.hero-phone {
  width: 55%;
  aspect-ratio: 9/19;
  background: var(--bg-white);
  border-radius: 24px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px;
  gap: 10px;
  overflow: hidden;
}

.phone-notch {
  width: 40%;
  height: 6px;
  background: var(--bg-light);
  border-radius: 4px;
}

.phone-line {
  width: 100%;
  height: 8px;
  background: var(--bg-light);
  border-radius: 4px;
}

.phone-line.short {
  width: 65%;
}

.phone-block {
  width: 100%;
  flex: 1;
  background: linear-gradient(135deg, #EBF4FF, var(--bg-light));
  border-radius: 12px;
}

.phone-dots {
  display: flex;
  gap: 6px;
  margin-top: auto;
  padding-bottom: 4px;
}

.phone-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
}

.phone-dots span:first-child {
  background: var(--accent);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: var(--text-white);
  box-shadow: 0 4px 14px rgba(26, 54, 93, 0.25);
}

.btn-primary:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 54, 93, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--primary);
  background: rgba(26, 54, 93, 0.04);
  transform: translateY(-2px);
}

.btn svg {
  width: 18px;
  height: 18px;
}

/* ===== Section Common ===== */
.section {
  padding: 100px 0;
}

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

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-header p {
  font-size: 1.05rem;
  color: var(--text-gray);
  max-width: 560px;
  margin: 0 auto;
}

/* ===== About Section ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text h3 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
}

.about-text p {
  color: var(--text-gray);
  font-size: 1.02rem;
  margin-bottom: 14px;
}

.values-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 32px;
}

.value-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}

.value-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.value-icon {
  width: 44px;
  height: 44px;
  background: rgba(56, 178, 172, 0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  color: var(--accent);
}

.value-icon svg {
  width: 22px;
  height: 22px;
}

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

.value-card p {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* About Stats */
.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.stat-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  transition: all var(--transition);
}

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

.stat-number {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-light);
  margin-top: 6px;
}

/* ===== Apps Section ===== */
.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
}

.app-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.app-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--secondary));
  opacity: 0;
  transition: opacity var(--transition);
}

.app-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.app-card:hover::before {
  opacity: 1;
}

.app-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(26, 54, 93, 0.2);
}

.app-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.app-icon svg {
  width: 30px;
  height: 30px;
}

.app-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
}

.app-card p {
  font-size: 0.93rem;
  color: var(--text-gray);
  line-height: 1.7;
  margin-bottom: 20px;
}

.app-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 4px;
  background: rgba(56, 178, 172, 0.1);
  color: var(--accent);
}

.badge-platform {
  background: rgba(26, 54, 93, 0.08);
  color: var(--primary);
}

.app-links {
  display: flex;
  gap: 10px;
}

.app-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--secondary);
  padding: 8px 14px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  transition: all var(--transition);
}

.app-links a:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--text-white);
}

.app-links a svg {
  width: 16px;
  height: 16px;
}

/* ===== Contact Section ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.contact-info h3 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
}

.contact-info > p {
  color: var(--text-gray);
  margin-bottom: 32px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 24px;
}

.contact-icon {
  width: 44px;
  height: 44px;
  min-width: 44px;
  background: rgba(56, 178, 172, 0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.contact-icon svg {
  width: 20px;
  height: 20px;
}

.contact-item-text h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 2px;
}

.contact-item-text p,
.contact-item-text a {
  font-size: 0.9rem;
  color: var(--text-gray);
}

.contact-item-text a:hover {
  color: var(--accent);
}

.social-links {
  display: flex;
  gap: 10px;
  margin-top: 32px;
}

.social-links a {
  width: 42px;
  height: 42px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-gray);
  transition: all var(--transition);
}

.social-links a:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--text-white);
  transform: translateY(-2px);
}

.social-links a svg {
  width: 18px;
  height: 18px;
}

/* Contact Form */
.contact-form {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.93rem;
  font-family: inherit;
  color: var(--text-dark);
  background: var(--bg-light);
  transition: all var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  background: var(--bg-white);
  box-shadow: 0 0 0 3px rgba(56, 178, 172, 0.1);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.contact-form .btn {
  width: 100%;
  justify-content: center;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-dark);
  color: var(--text-white);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand .logo {
  color: var(--text-white);
  margin-bottom: 14px;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 320px;
}

.footer h4 {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 18px;
  color: rgba(255, 255, 255, 0.9);
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--transition);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.4);
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.4);
}

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

.footer-legal {
  display: flex;
  gap: 20px;
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger children */
.stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.stagger.visible > *:nth-child(1) { transition-delay: 0s; }
.stagger.visible > *:nth-child(2) { transition-delay: 0.1s; }
.stagger.visible > *:nth-child(3) { transition-delay: 0.2s; }
.stagger.visible > *:nth-child(4) { transition-delay: 0.3s; }
.stagger.visible > *:nth-child(5) { transition-delay: 0.4s; }

.stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 2.6rem;
  }

  .hero .container {
    gap: 40px;
  }

  .section-header h2 {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-white);
    flex-direction: column;
    padding: 80px 32px 32px;
    gap: 24px;
    box-shadow: var(--shadow-lg);
    transition: right var(--transition);
    z-index: 999;
  }

  .nav.open {
    right: 0;
  }

  .nav-links {
    flex-direction: column;
    gap: 16px;
  }

  .nav-links a {
    font-size: 1.1rem;
  }

  /* Overlay */
  .nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 998;
  }

  .nav-overlay.show {
    display: block;
  }

  .hero {
    padding: 120px 0 60px;
    min-height: auto;
  }

  .hero .container {
    flex-direction: column;
    text-align: center;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero p {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-visual {
    width: 100%;
  }

  .hero-illustration {
    max-width: 300px;
  }

  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .about-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .stat-number {
    font-size: 1.8rem;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .section {
    padding: 70px 0;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .section-header h2 {
    font-size: 1.6rem;
  }

  .about-stats {
    grid-template-columns: 1fr;
  }

  .app-links {
    flex-direction: column;
  }

  .app-links a {
    justify-content: center;
  }
}