:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f7f8fa;
  --color-text: #1a1a2e;
  --color-text-light: #555566;
  --color-accent: #0077b6;
  --color-accent-dark: #005f8a;
  --color-accent-light: #e0f2fe;
  --color-border: #e2e4e8;
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.75rem;
  --font-size-4xl: 3.5rem;
  --line-height-body: 1.7;
  --line-height-heading: 1.2;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 5rem;
  --spacing-3xl: 7rem;
  --max-width: 1200px;
  --nav-height: 80px;
  --nav-height-scrolled: 64px;
  --border-radius: 12px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s ease;
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

h1, h2, h3, h4 {
  line-height: var(--line-height-heading);
  font-weight: 700;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

section {
  padding: var(--spacing-3xl) 0;
}

.section-title {
  font-size: var(--font-size-2xl);
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

/* ─── Navbar ─── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  transition: height var(--transition-base), box-shadow var(--transition-base);
}

.navbar--scrolled {
  height: var(--nav-height-scrolled);
  box-shadow: var(--shadow-sm);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.navbar__logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.navbar__logo:hover {
  color: var(--color-accent);
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  list-style: none;
}

.navbar__links a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
}

.navbar__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

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

.navbar__links a:hover::after {
  width: 100%;
}

.navbar__links a.navbar__cta {
  background: var(--color-accent);
  color: #fff;
  padding: 0.6rem 1.4rem;
  border-radius: 8px;
  font-weight: 600;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.navbar__cta:hover {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
}

.navbar__cta::after {
  display: none;
}

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

.navbar__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

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

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

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

/* ─── Hero ─── */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: url('assets/hero.jpg') center/cover no-repeat;
  overflow: hidden;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(0, 119, 182, 0.7) 0%,
    rgba(26, 26, 46, 0.8) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 0 var(--spacing-md);
  max-width: 800px;
}

.hero__title {
  font-size: var(--font-size-4xl);
  color: #fff;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.03em;
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.85);
  font-weight: 400;
  max-width: 600px;
  margin: 0 auto;
}

.hero__ecg {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 1;
  overflow: hidden;
}

.ecg-line {
  width: 200%;
  height: 80px;
  animation: ecg-scroll 6s linear infinite;
}

@keyframes ecg-scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ─── Fade-in animation base ─── */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

/* ─── Why Choose ─── */
.why-choose {
  background: var(--color-bg);
}

.why-choose__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.why-choose__card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.why-choose__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--color-accent-light);
  color: var(--color-accent);
  margin-bottom: var(--spacing-md);
}

.why-choose__card p {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

.why-choose__cta {
  text-align: center;
  background: var(--color-accent-light);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg) var(--spacing-xl);
}

.why-choose__cta p {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

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

.btn--primary:hover {
  background: var(--color-accent-dark);
  color: #fff;
  transform: translateY(-1px);
}

/* ─── Services ─── */
.services {
  background: var(--color-bg-alt);
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.services__card {
  background: var(--color-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-top: 3px solid transparent;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.services__card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-top-color: var(--color-accent);
}

.services__img-wrap {
  overflow: hidden;
  height: 200px;
}

.services__img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.services__card:hover .services__img-wrap img {
  transform: scale(1.05);
}

.services__body {
  padding: var(--spacing-md);
}

.services__body h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.services__body p {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

/* ─── ECG Divider ─── */
.ecg-divider {
  width: 100%;
  overflow: hidden;
  line-height: 0;
}

.ecg-divider svg {
  width: 100%;
  height: 40px;
}

/* ─── About ─── */
.about {
  background: var(--color-bg-alt);
  padding-top: 0;
}

.about__content {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.about__content p {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ─── Contact ─── */
.contact {
  background: var(--color-bg);
}

.contact__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
  max-width: 800px;
  margin: 0 auto var(--spacing-xl);
}

.contact__card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.contact__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-accent-light);
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.contact__card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
}

.contact__card address {
  font-style: normal;
  color: var(--color-text-light);
}

.contact__detail {
  margin-top: var(--spacing-xs);
}

.contact__map {
  margin-bottom: var(--spacing-md);
  border-radius: 8px;
  overflow: hidden;
  line-height: 0;
}

.contact__map iframe {
  width: 100%;
  display: block;
}

.contact__address-link {
  color: var(--color-text-light);
  transition: color var(--transition-fast);
}

.contact__address-link:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.contact__email {
  text-align: center;
  font-size: var(--font-size-lg);
  font-weight: 500;
}

.contact__email a {
  color: var(--color-accent);
}

.contact__email a:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

/* ─── Footer ─── */
.footer {
  background: var(--color-text);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--spacing-xl) 0;
}

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

.footer__logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: #fff;
  display: block;
  margin-bottom: var(--spacing-xs);
}

.footer__copy {
  font-size: 0.85rem;
}

.footer__nav {
  display: flex;
  gap: var(--spacing-md);
}

.footer__nav a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer__nav a:hover {
  color: #fff;
}

/* ─── Responsive: Tablet (max-width: 1024px) ─── */
@media (max-width: 1024px) {
  :root {
    --font-size-4xl: 2.75rem;
    --font-size-3xl: 2.25rem;
  }

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

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

/* ─── Responsive: Mobile (max-width: 768px) ─── */
@media (max-width: 768px) {
  :root {
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
    --font-size-2xl: 1.5rem;
    --spacing-3xl: 4rem;
  }

  .navbar__hamburger {
    display: flex;
  }

  .navbar__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: var(--spacing-sm);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-base), opacity var(--transition-base);
    box-shadow: var(--shadow-md);
  }

  .navbar__links--open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .navbar__links a {
    font-size: var(--font-size-lg);
    padding: var(--spacing-xs) 0;
  }

  .navbar__links a::after {
    display: none;
  }

  .navbar__cta {
    text-align: center;
    width: 100%;
    justify-content: center;
  }

  .hero {
    min-height: 500px;
  }

  .why-choose__grid {
    grid-template-columns: 1fr;
  }

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

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

  .footer__inner {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-md);
  }

  .footer__nav {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* ─── Reduced Motion ─── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}