/*======================================
    ROOT
======================================*/

:root {
  --primary: #003b6d;
  --secondary: #0b2038;
  --accent: #3cb043;

  --dark: #1f2937;
  --text: #5c6773;

  --white: #ffffff;
  --light: #f7fafc;
  --border: #e6edf3;

  --shadow: 0 15px 40px rgba(0, 0, 0, 0.08);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Arimo", sans-serif;
  color: var(--dark);
  background: white;
}

#content {
  overflow: hidden;
}

section {
  padding: 60px 0;
}

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

a {
  text-decoration: none;
}

.container,
.hero-container {
  width: min(1180px, 90%);
  margin: auto;
}

/*======================================
    SECTION HEADER
======================================*/

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-label {
  display: inline-block;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.section-header h2 {
  font-size: clamp(2rem, 3vw, 3.2rem);
  color: var(--secondary);
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-header p {
  max-width: 720px;
  margin: auto;
  color: var(--text);
  line-height: 1.9;
}

/*======================================
    BUTTONS
======================================*/

.hero-buttons {
  display: flex;
  gap: 18px;
  margin-top: 24px;
}

.primary-btn,
.secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  padding: 15px 32px;

  border-radius: 50px;

  font-weight: 600;

  transition: 0.35s;
}

.primary-btn {
  background: var(--primary);
  color: white;
}

.primary-btn:hover {
  background: var(--accent);
  transform: translateY(-3px);
}

.secondary-btn {
  border: 1px solid var(--border);
  color: var(--secondary);
  background: white;
}

.secondary-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/*======================================
    HERO
======================================*/

.tb-hero {
  background: linear-gradient(180deg, #f8fbfd 0%, #ffffff 100%);

  position: relative;

  padding: 40px 0 25px;
}

.tb-hero::before {
  content: "";

  position: absolute;

  inset: 0;

  background-image:
    linear-gradient(rgba(0, 59, 109, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 59, 109, 0.03) 1px, transparent 1px);

  background-size: 60px 60px;

  pointer-events: none;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: start;

  position: relative;
  z-index: 2;
}

.hero-left h1 {
  font-size: clamp(3rem, 5vw, 5rem);
  color: #17335e;
  line-height: 1.05;
  margin: 12px 0 16px;
}

.hero-left p {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text);
  max-width: 620px;
}
/*======================================
    HERO RIGHT
======================================*/

.hero-right {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-card {
  background: white;

  border: 1px solid var(--border);

  border-radius: 18px;

  padding: 18px;

  display: flex;
  gap: 18px;

  align-items: flex-start;

  transition: 0.35s;

  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.04);
}

.feature-card:hover {
  transform: translateY(-6px);

  box-shadow: var(--shadow);

  border-color: rgba(60, 176, 67, 0.35);
}

.feature-number {
  width: 48px;
  height: 48px;

  flex-shrink: 0;

  border-radius: 14px;

  background: #eef6fb;

  color: var(--primary);

  display: flex;
  align-items: center;
  justify-content: center;

  font-size: 1rem;
  font-weight: 700;

  transition: 0.35s;
}

.feature-card:hover .feature-number {
  background: var(--accent);
  color: white;
}

.feature-card h3 {
  color: var(--secondary);

  font-size: 1.05rem;

  margin-bottom: 8px;
}

.feature-card p {
  color: var(--text);

  line-height: 1.65;

  font-size: 0.9rem;
}

/*======================================
    OVERVIEW
======================================*/

.overview {
  background: white;
}

.overview-grid {
  width: min(1180px, 90%);
  margin: auto;

  display: grid;

  grid-template-columns: 1fr 1fr;

  gap: 50px;

  align-items: center;
}

.overview-image {
  border-radius: 22px;

  overflow: hidden;

  box-shadow: var(--shadow);
}

.overview-image img {
  height: auto;
  transition: 0.6s;
}

.overview-image:hover img {
  transform: scale(1.05);
}

.overview-content p {
  color: var(--text);

  line-height: 2;

  margin-bottom: 18px;
}

.overview-list {
  list-style: none;

  display: grid;

  gap: 14px;

  margin-top: 26px;
}

.overview-list li {
  position: relative;

  padding-left: 34px;

  color: var(--secondary);

  font-weight: 500;
}

.overview-list li::before {
  content: "";

  position: absolute;

  left: 0;
  top: 8px;

  width: 12px;
  height: 12px;

  border-radius: 50%;

  background: var(--accent);
}
/*======================================
    ENGINEERING SERVICES
======================================*/

.engineering-services {
  background: var(--light);
}

.service-grid {
  width: min(1180px, 90%);
  margin: auto;

  display: grid;

  grid-template-columns: repeat(2, 1fr);

  gap: 24px;
}

.service-card {
  background: white;

  border: 1px solid var(--border);

  border-radius: 20px;

  padding: 32px;

  transition: 0.35s;

  position: relative;

  overflow: hidden;

  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.03);
}

.service-card::before {
  content: "";

  position: absolute;

  left: 0;
  top: 0;

  width: 4px;
  height: 0;

  background: var(--accent);

  transition: 0.35s;
}

.service-card:hover {
  transform: translateY(-8px);

  box-shadow: var(--shadow);
}

.service-card:hover::before {
  height: 100%;
}

.service-icon {
  width: 54px;
  height: 54px;

  border-radius: 14px;

  background: #eef6fb;

  color: var(--primary);

  display: flex;
  align-items: center;
  justify-content: center;

  font-size: 1.05rem;
  font-weight: 700;

  margin-bottom: 20px;

  transition: 0.35s;
}

.service-card:hover .service-icon {
  background: var(--accent);

  color: white;
}

.service-card h3 {
  color: var(--secondary);

  font-size: 1.3rem;

  margin-bottom: 14px;
}

.service-card p {
  color: var(--text);

  line-height: 1.9;
}

/*======================================
    FEATURE BAND
======================================*/

.feature-band {
  width: min(1180px, 90%);
  margin: auto;

  display: grid;

  grid-template-columns: 1fr 1fr;

  gap: 50px;

  align-items: center;
}

.feature-image {
  overflow: hidden;

  border-radius: 24px;

  box-shadow: var(--shadow);
}

.feature-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: 0.6s;
}

.feature-image:hover img {
  transform: scale(1.05);
}

.feature-content h2 {
  color: var(--secondary);

  font-size: clamp(2rem, 3vw, 3rem);

  line-height: 1.2;

  margin: 12px 0 18px;
}

.feature-content p {
  color: var(--text);

  line-height: 2;

  margin-bottom: 26px;
}

.feature-points {
  display: grid;

  gap: 16px;
}

.point {
  padding: 18px 22px;

  background: white;

  border: 1px solid var(--border);

  border-radius: 16px;

  transition: 0.3s;
}

.point:hover {
  border-color: var(--accent);

  transform: translateX(6px);
}

.point h4 {
  color: var(--secondary);

  margin-bottom: 8px;
}

.point p {
  margin: 0;

  line-height: 1.8;
}
/*======================================
    MODERNIZATION
======================================*/

.modernization {
  background: var(--light);
}

.modernization-grid {
  width: min(1180px, 90%);
  margin: auto;

  display: grid;

  grid-template-columns: repeat(2, 1fr);

  gap: 24px;
}

.modern-card {
  background: white;

  border: 1px solid var(--border);

  border-radius: 20px;

  padding: 32px;

  transition: 0.35s;

  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.03);
}

.modern-card:hover {
  transform: translateY(-8px);

  box-shadow: var(--shadow);

  border-color: rgba(60, 176, 67, 0.35);
}

.modern-card h3 {
  color: var(--secondary);

  font-size: 1.3rem;

  margin-bottom: 14px;

  position: relative;

  padding-bottom: 12px;
}

.modern-card h3::after {
  content: "";

  position: absolute;

  left: 0;
  bottom: 0;

  width: 55px;
  height: 3px;

  background: var(--accent);

  border-radius: 10px;
}

.modern-card p {
  color: var(--text);

  line-height: 1.9;
}

/*======================================
    TESTING & VALIDATION
======================================*/

.testing-validation {
  background: white;
}

.validation-grid {
  width: min(1180px, 90%);
  margin: auto;

  display: grid;

  grid-template-columns: repeat(2, 1fr);

  gap: 24px;
}

.validation-item {
  background: #fbfdff;

  border: 1px solid var(--border);

  border-radius: 18px;

  padding: 28px;

  transition: 0.35s;
}

.validation-item:hover {
  border-color: var(--accent);

  transform: translateY(-6px);

  box-shadow: var(--shadow);
}

.validation-item h3 {
  color: var(--secondary);

  margin-bottom: 12px;

  font-size: 1.3rem;
}

.validation-item p {
  color: var(--text);

  line-height: 1.9;
}
/*======================================
    PROCESS
======================================*/

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

.process-timeline {
  width: min(1100px, 90%);
  margin: auto;

  display: grid;

  grid-template-columns: repeat(4, 1fr);

  gap: 24px;

  position: relative;
}

.process-step {
  position: relative;

  background: white;

  border: 1px solid var(--border);

  border-radius: 20px;

  padding: 32px 26px;

  text-align: center;

  transition: 0.35s;

  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.03);
}

.process-step:hover {
  transform: translateY(-8px);

  box-shadow: var(--shadow);

  border-color: rgba(60, 176, 67, 0.35);
}

.process-step span {
  width: 60px;
  height: 60px;

  margin: 0 auto 18px;

  border-radius: 50%;

  background: #eef6fb;

  color: var(--primary);

  display: flex;
  align-items: center;
  justify-content: center;

  font-size: 1.15rem;
  font-weight: 700;

  transition: 0.35s;
}

.process-step:hover span {
  background: var(--accent);

  color: white;
}

.process-step h3 {
  color: var(--secondary);

  margin-bottom: 12px;

  font-size: 1.25rem;
}

.process-step p {
  color: var(--text);

  line-height: 1.9;
}

/*======================================
    CTA
======================================*/

.service-cta {
  padding: 35px 0;

  background: white;
}

.cta-box {
  width: min(1180px, 90%);
  margin: auto;

  background: linear-gradient(135deg, #003b6d, #0b2038);

  border-radius: 28px;

  padding: 60px;

  text-align: center;

  color: white;

  position: relative;

  overflow: hidden;
}

.cta-box::before {
  content: "";

  position: absolute;

  width: 420px;
  height: 420px;

  right: -160px;
  top: -160px;

  border-radius: 50%;

  background: rgba(255, 255, 255, 0.05);
}

.cta-box .section-label {
  color: #7be37f;
}

.cta-box h2 {
  color: white;

  font-size: clamp(2rem, 3vw, 3.4rem);

  margin: 14px 0 20px;
}

.cta-box p {
  max-width: 720px;

  margin: 0 auto 30px;

  line-height: 2;

  color: rgba(255, 255, 255, 0.82);
}

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

.cta-box .secondary-btn {
  background: transparent;

  border: 1px solid rgba(255, 255, 255, 0.2);

  color: white;
}

.cta-box .secondary-btn:hover {
  background: white;

  color: var(--primary);
}

/*======================================
    RESPONSIVE
======================================*/

@media (max-width: 992px) {
  .hero-container,
  .overview-grid,
  .feature-band {
    grid-template-columns: 1fr;

    gap: 32px;
  }

  .service-grid,
  .modernization-grid,
  .validation-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  section {
    padding: 60px 0;
  }

  .tb-hero {
    padding: 40px 0 25px;
  }

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

  .hero-buttons a {
    width: 100%;
  }

  .process-timeline {
    grid-template-columns: 1fr;
  }

  .cta-box {
    padding: 48px 24px;
  }
}

@media (max-width: 576px) {
  .hero-left h1 {
    font-size: 2.6rem;
  }

  .feature-card,
  .service-card,
  .modern-card,
  .validation-item,
  .process-step {
    padding: 24px;
  }

  .section-header {
    margin-bottom: 40px;
  }
}