/* ===== CSS Variables ===== */
:root {
  --color-dark: #13141C;
  --color-dark-secondary: #1E1F28;
  --color-dark-tertiary: #2A2B36;
  --color-accent: #E84A2C;
  --color-accent-hover: #C93D22;
  --color-muted: #5A6675;
  --color-light: #F4F2EE;
  --color-light-secondary: #EAE6DF;
  --color-card: #FFFFFF;
  --color-border: #DCD9D2;
  --color-text: #13141C;
  --color-text-secondary: #3A3C47;
  --color-text-muted: #5A6675;
  --color-text-inverse: #F4F2EE;
  --color-success: #2D8A4E;
  --container-max: 1200px;
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-light);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Main Navigation ===== */
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background-color: var(--color-dark);
  z-index: 1000;
  transition: box-shadow 0.3s ease;
}

.main-nav.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
}

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

.nav-logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text-inverse);
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
  align-items: center;
}

.nav-links a {
  color: var(--color-text-inverse);
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 0.93rem;
  font-weight: 500;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-links a:hover {
  background-color: var(--color-dark-tertiary);
  color: var(--color-accent);
}

.nav-cta a {
  background-color: var(--color-accent);
  color: #FFFFFF;
  padding: 10px 22px;
  border-radius: 6px;
  font-weight: 600;
  transition: background-color 0.2s ease;
}

.nav-cta a:hover {
  background-color: var(--color-accent-hover);
  color: #FFFFFF;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 26px;
  height: 2.5px;
  background-color: var(--color-text-inverse);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

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

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

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

/* ===== Hero ===== */
.hero {
  padding: 140px 0 100px;
  background-color: var(--color-dark);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 700px;
  height: 700px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 74, 44, 0.12) 0%, transparent 70%);
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 74, 44, 0.08) 0%, transparent 70%);
}

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

.hero-content h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-text-inverse);
  margin-bottom: 20px;
  letter-spacing: -1px;
}

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

.hero-content p {
  font-size: 1.15rem;
  color: #A0A4B0;
  margin-bottom: 36px;
  max-width: 520px;
  line-height: 1.7;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: 8px;
  font-size: 0.98rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.25s ease;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(232, 74, 44, 0.35);
}

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

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

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

.hero-card-stack {
  position: relative;
  width: 380px;
  height: 340px;
}

.hero-card {
  position: absolute;
  background-color: var(--color-dark-secondary);
  border: 1px solid var(--color-dark-tertiary);
  border-radius: 16px;
  padding: 28px;
  color: var(--color-text-inverse);
}

.hero-card.card-main {
  top: 0;
  left: 20px;
  width: 320px;
  height: 240px;
  z-index: 3;
  background-color: var(--color-dark-tertiary);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-card.card-behind {
  top: 50px;
  right: 0;
  width: 280px;
  height: 200px;
  z-index: 2;
  background-color: #252630;
}

.hero-card.card-far {
  top: 100px;
  left: 70px;
  width: 240px;
  height: 160px;
  z-index: 1;
  background-color: #30313B;
}

.hero-card .card-icon {
  width: 44px;
  height: 44px;
  background: rgba(232, 74, 44, 0.15);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 1.3rem;
  color: var(--color-accent);
}

.hero-card h4 {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.hero-card p {
  font-size: 0.85rem;
  color: #8A8F9A;
  line-height: 1.5;
}

/* ===== Section Common ===== */
.section {
  padding: 90px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header h2 {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}

.section-header p {
  font-size: 1.08rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.65;
}

/* ===== Services ===== */
#services {
  background-color: var(--color-light);
}

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

.service-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 36px 30px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(19, 20, 28, 0.10);
}

.service-icon {
  width: 52px;
  height: 52px;
  background-color: var(--color-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
  color: var(--color-accent);
}

.service-card h3 {
  font-size: 1.18rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-text);
}

.service-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== Stats ===== */
#stats {
  background-color: var(--color-dark);
  padding: 70px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}

.stat-item {
  padding: 20px;
}

.stat-number {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--color-accent);
  margin-bottom: 6px;
  letter-spacing: -1px;
}

.stat-label {
  font-size: 0.95rem;
  color: #8A8F9A;
  font-weight: 500;
}

/* ===== About ===== */
#about {
  background-color: var(--color-light-secondary);
}

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

.about-text h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 18px;
  color: var(--color-text);
}

.about-text p {
  color: var(--color-text-secondary);
  font-size: 1.0rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.about-features {
  list-style: none;
  margin-top: 20px;
}

.about-features li {
  padding: 10px 0;
  padding-left: 28px;
  position: relative;
  color: var(--color-text-secondary);
  font-size: 0.96rem;
}

.about-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 16px;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.about-visual {
  display: flex;
  justify-content: center;
}

.about-block {
  background-color: var(--color-dark);
  border-radius: 20px;
  padding: 48px 40px;
  color: var(--color-text-inverse);
  max-width: 460px;
}

.about-block h4 {
  font-size: 1.25rem;
  color: var(--color-accent);
  margin-bottom: 20px;
}

.about-block ul {
  list-style: none;
}

.about-block ul li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-dark-tertiary);
  font-size: 0.94rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.about-block ul li:last-child {
  border-bottom: none;
}

.about-block ul li strong {
  color: var(--color-text-inverse);
}

/* ===== Features ===== */
#features {
  background-color: var(--color-light);
}

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

.feature-item {
  display: flex;
  gap: 20px;
  padding: 30px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.feature-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(19, 20, 28, 0.07);
}

.feature-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  flex-shrink: 0;
}

.feature-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-text);
}

.feature-content p {
  font-size: 0.93rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* ===== Contact ===== */
#contact {
  background-color: var(--color-dark);
}

#contact .section-header h2 {
  color: var(--color-text-inverse);
}

#contact .section-header p {
  color: #8A8F9A;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 50px;
  align-items: start;
}

.contact-info h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text-inverse);
  margin-bottom: 14px;
}

.contact-info p {
  color: #8A8F9A;
  line-height: 1.65;
  margin-bottom: 24px;
}

.contact-details {
  list-style: none;
}

.contact-details li {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-dark-tertiary);
  color: #C0C4CF;
  font-size: 0.95rem;
}

.contact-details li:last-child {
  border-bottom: none;
}

.contact-icon {
  width: 40px;
  height: 40px;
  background-color: var(--color-dark-tertiary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.1rem;
  color: var(--color-accent);
}

.contact-form {
  background-color: var(--color-dark-secondary);
  border-radius: 16px;
  padding: 36px;
}

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

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: #C0C4CF;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 13px 16px;
  background-color: var(--color-dark);
  border: 1px solid var(--color-dark-tertiary);
  border-radius: 8px;
  color: var(--color-text-inverse);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s ease;
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
}

.form-group textarea {
  min-height: 130px;
  resize: vertical;
}

.form-submit {
  width: 100%;
  padding: 14px;
  background-color: var(--color-accent);
  color: #FFFFFF;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.25s ease;
}

.form-submit:hover {
  background-color: var(--color-accent-hover);
}

.form-message {
  text-align: center;
  margin-top: 12px;
  font-size: 0.9rem;
  min-height: 22px;
}

.form-message.success {
  color: var(--color-success);
}

.form-message.error {
  color: var(--color-accent);
}

/* ===== Footer ===== */
.site-footer {
  background-color: var(--color-dark);
  border-top: 1px solid var(--color-dark-tertiary);
  padding: 40px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 30px;
}

.footer-brand h3 {
  color: var(--color-text-inverse);
  font-size: 1.3rem;
  margin-bottom: 10px;
}

.footer-brand h3 span {
  color: var(--color-accent);
}

.footer-brand p {
  color: #8A8F9A;
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-col h4 {
  color: var(--color-text-inverse);
  font-size: 0.95rem;
  margin-bottom: 16px;
  font-weight: 700;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  color: #8A8F9A;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.footer-col ul li a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid var(--color-dark-tertiary);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  color: #6A6E7A;
  font-size: 0.85rem;
}

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

.footer-legal-links a {
  color: #8A8F9A;
  font-size: 0.85rem;
}

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

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

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

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content p {
    max-width: 100%;
  }

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

  .hero-visual {
    display: none;
  }

  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .about-visual {
    order: -1;
  }

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

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  .hamburger {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background-color: var(--color-dark-secondary);
    flex-direction: column;
    padding: 90px 30px 30px;
    gap: 6px;
    transition: right 0.35s ease;
    box-shadow: -5px 0 30px rgba(0, 0, 0, 0.3);
  }

  .nav-links.active {
    right: 0;
  }

  .nav-links a {
    display: block;
    padding: 12px 16px;
    font-size: 1rem;
  }

  .hero {
    padding: 110px 0 70px;
  }

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

  .section-header h2 {
    font-size: 1.8rem;
  }

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

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

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

  .contact-form {
    padding: 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 1.7rem;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .hero-buttons .btn {
    text-align: center;
    justify-content: center;
  }

  .section {
    padding: 60px 0;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .stat-number {
    font-size: 2rem;
  }

  .container {
    padding: 0 16px;
  }
}