/* ===== CSS Variables ===== */
:root {
  --color-primary: #00e5cc;
  --color-primary-dark: #00bfa6;
  --color-secondary: #f57c00;
  --color-dark: #0a0a1a;
  --color-dark-light: #111128;
  --color-text: #e0e0e0;
  --color-text-light: #a0a0b8;
  --color-text-muted: #6a6a80;
  --color-bg: #0e0e20;
  --color-bg-light: #141430;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-white: #ffffff;
  --gradient-hero: linear-gradient(135deg, #0a0a1a 0%, #111128 40%, #0d1b3e 100%);
  --gradient-accent: linear-gradient(135deg, #00e5cc, #00b4d8);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --font-stack: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --max-width: 1200px;
  --nav-height: 72px;
}

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

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

body {
  font-family: var(--font-stack);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-image: radial-gradient(ellipse at 50% 0%, rgba(0, 229, 204, 0.03) 0%, transparent 60%);
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

ul, ol {
  list-style: none;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(10, 10, 26, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow 0.3s ease;
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(0, 229, 204, 0.08);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.5px;
}

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

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-light);
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 1px;
  transition: width 0.3s ease;
}

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

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Hero Section ===== */
.hero {
  background: var(--gradient-hero);
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 229, 204, 0.12) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(245, 124, 0, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero .container {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-logo {
  width: 180px;
  height: auto;
  margin: 0 auto 36px;
  border-radius: 16px;
  filter: drop-shadow(0 0 40px rgba(0, 229, 204, 0.25));
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero h1 .highlight {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.7);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

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

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-accent);
  color: var(--color-dark);
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(0, 229, 204, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 229, 204, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-dark-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-dark-outline:hover {
  background: var(--color-primary);
  color: var(--color-dark);
}

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

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

.section-dark {
  background: var(--gradient-hero);
  color: var(--color-white);
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header .tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(0, 229, 204, 0.1);
  color: var(--color-primary);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border: 1px solid rgba(0, 229, 204, 0.15);
}

.section-dark .section-header .tag {
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.9);
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-dark .section-header h2 {
  color: var(--color-white);
}

.section-header p {
  font-size: 1.1rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

.section-dark .section-header p {
  color: rgba(255, 255, 255, 0.6);
}

/* ===== Feature Cards ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--color-bg-light);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid var(--color-border);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 32px rgba(0, 229, 204, 0.1);
  border-color: rgba(0, 229, 204, 0.2);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  background: rgba(0, 229, 204, 0.1);
}

.feature-icon.purple {
  background: rgba(0, 180, 216, 0.1);
}

.feature-icon.green {
  background: rgba(0, 229, 204, 0.1);
}

.feature-icon.orange {
  background: rgba(245, 124, 0, 0.1);
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--color-white);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ===== About / Business Section ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-content h3 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--color-white);
}

.about-content p {
  color: var(--color-text-light);
  margin-bottom: 16px;
  line-height: 1.8;
}

.about-content .check-list {
  margin-top: 24px;
}

.about-content .check-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
  font-weight: 500;
  color: var(--color-text);
}

.check-list li::before {
  content: '✓';
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: rgba(0, 229, 204, 0.12);
  color: var(--color-primary);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.about-visual {
  background: var(--gradient-hero);
  border-radius: var(--radius-lg);
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  position: relative;
  overflow: hidden;
}

.about-visual::before {
  content: '';
  position: absolute;
  top: 20%;
  right: 10%;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(0, 229, 204, 0.15), transparent);
  border-radius: 50%;
}

.about-visual-inner {
  text-align: center;
  color: var(--color-white);
  z-index: 1;
}

.about-visual-inner .big-icon {
  font-size: 64px;
  margin-bottom: 20px;
}

.about-visual-inner .about-logo {
  width: 180px;
  height: auto;
  margin: 0 auto 24px;
  border-radius: 12px;
}

.about-visual-inner h4 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.about-visual-inner p {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
}

/* ===== Stats Section ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

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

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.section-dark .stat-number {
  color: var(--color-primary);
  -webkit-text-fill-color: unset;
  background: none;
}

.stat-label {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 8px;
}

/* ===== Products Page ===== */
.page-hero {
  background: var(--gradient-hero);
  padding: 160px 0 80px;
  text-align: center;
}

.page-hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 16px;
}

.page-hero p {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.65);
  max-width: 600px;
  margin: 0 auto;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.product-card {
  background: var(--color-bg-light);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  border: 1px solid var(--color-border);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0, 229, 204, 0.1);
  border-color: rgba(0, 229, 204, 0.2);
}

.product-card .icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
  background: rgba(0, 229, 204, 0.1);
}

.product-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-white);
}

.product-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* Partners */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.partner-card {
  background: var(--color-bg-light);
  border-radius: var(--radius-md);
  padding: 32px 20px;
  text-align: center;
  border: 1px solid var(--color-border);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.partner-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 20px rgba(0, 229, 204, 0.08);
  border-color: rgba(0, 229, 204, 0.15);
}

.partner-card .partner-icon {
  font-size: 36px;
  margin-bottom: 12px;
}

.partner-card h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 6px;
}

.partner-card p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* Process / Steps */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.process-steps::before {
  content: '';
  position: absolute;
  top: 24px;
  left: 12.5%;
  right: 12.5%;
  height: 2px;
  background: var(--gradient-accent);
  opacity: 0.3;
}

.step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: var(--color-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  margin: 0 auto 16px;
  box-shadow: 0 4px 12px rgba(0, 229, 204, 0.25);
}

.step h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 8px;
}

.step p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ===== Privacy Page ===== */
.privacy-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 24px 100px;
}

.privacy-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-white);
  margin: 40px 0 16px;
  padding-top: 16px;
}

.privacy-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-white);
  margin: 24px 0 12px;
}

.privacy-content p {
  color: var(--color-text-light);
  margin-bottom: 14px;
  line-height: 1.8;
}

.privacy-content ul {
  padding-left: 20px;
  margin-bottom: 14px;
}

.privacy-content ul li {
  color: var(--color-text-light);
  line-height: 1.8;
  padding: 4px 0;
  list-style: disc;
}

.privacy-content a {
  color: var(--color-primary);
}

.privacy-content a:hover {
  text-decoration: underline;
}

/* ===== Contact Page ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-form {
  background: var(--color-bg-light);
  border-radius: var(--radius-md);
  padding: 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-stack);
  font-size: 0.95rem;
  color: var(--color-text);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  background: var(--color-bg);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 229, 204, 0.1);
  background: var(--color-bg);
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
}

.form-group .error-msg {
  display: none;
  color: #e74c3c;
  font-size: 0.8rem;
  margin-top: 6px;
}

.form-group.error input,
.form-group.error textarea {
  border-color: #e74c3c;
}

.form-group.error .error-msg {
  display: block;
}

.form-submit {
  width: 100%;
  padding: 16px;
  border: none;
  border-radius: 50px;
  background: var(--gradient-accent);
  color: var(--color-dark);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.form-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 229, 204, 0.3);
}

.form-success {
  display: none;
  text-align: center;
  padding: 40px;
}

.form-success.show {
  display: block;
}

.form-success .check-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.form-success h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
  color: var(--color-white);
}

.form-success p {
  color: var(--color-text-light);
}

.contact-info {
  padding: 20px 0;
}

.contact-info h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
}

.contact-info > p {
  color: var(--color-text-light);
  margin-bottom: 32px;
  line-height: 1.7;
}

.info-card {
  background: var(--color-bg-light);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  border: 1px solid var(--color-border);
  transition: transform 0.3s ease;
}

.info-card:hover {
  transform: translateX(4px);
  border-color: rgba(0, 229, 204, 0.15);
}

.info-card .icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(0, 229, 204, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.info-card h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 4px;
}

.info-card p {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* ===== Footer ===== */
.footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .nav-logo {
  margin-bottom: 16px;
  display: inline-block;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.5);
}

.footer-col h4 {
  color: var(--color-white);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-col a {
  display: block;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.5);
  padding: 6px 0;
  transition: color 0.3s ease;
}

.footer-col a:hover {
  color: var(--color-white);
}

.footer-bottom {
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: var(--color-dark);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
  z-index: 999;
}

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

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .features-grid,
  .stats-grid,
  .partners-grid,
  .process-steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .process-steps::before {
    display: none;
  }

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

  .hero h1 {
    font-size: 2.8rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-toggle {
    display: flex;
  }

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

  .hero .subtitle {
    font-size: 1.05rem;
  }

  .features-grid,
  .products-grid {
    grid-template-columns: 1fr;
  }

  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

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

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

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

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .section {
    padding: 64px 0;
  }
}

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

  .stat-number {
    font-size: 2.2rem;
  }

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

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