/* ---------- RESET & DESIGN SYSTEM (BEM) ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #0fbaa8;
  --color-primary-light: #2dd4bf;
  --color-primary-dark: #0a8f80;
  --color-secondary: #1e2f3a;
  --color-accent: #ffb347;
  --color-gray-bg: #f9fafb;
  --color-white: #ffffff;
  --color-text-dark: #111827;
  --color-text-muted: #4b5563;
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-sm: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 20px 25px -12px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 15px rgba(15, 186, 168, 0.2);
  --transition-smooth: all 0.4s cubic-bezier(0.2, 0.9, 0.4, 1.1);
  --border-radius-card: 1.5rem;
  --container-padding: 1.5rem;
  --section-spacing: 6rem;
}

@media (max-width: 768px) {
  :root { --section-spacing: 4rem; }
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", system-ui, sans-serif;
  background-color: var(--color-white);
  color: var(--color-text-dark);
  line-height: 1.5;
  overflow-x: hidden;
}

/* scrollbar */
::-webkit-scrollbar { inline-size: 8px; }
::-webkit-scrollbar-track { background: #f1f1f1; }
::-webkit-scrollbar-thumb { background: var(--color-primary); border-radius: 10px; }

/* accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: 0.6rem 1.2rem;
  text-decoration: none;
  font-weight: 600;
  z-index: 9999;
  transition: top 0.2s;
}
.skip-link:focus { top: 0; }

/* container */
.container {
  max-inline-size: 1280px;
  margin-inline: auto;
  padding-inline: var(--container-padding);
  inline-size: 100%;
}

/* headings */
.heading-primary {
  font-size: clamp(2.8rem, 9vw, 5.5rem);
  font-weight: 800;
  background: linear-gradient(135deg, #d1d5db 0%, #9ca3af 100%);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  letter-spacing: -0.02em;
  text-align: center;
  line-height: 1.1;
}
.heading-primary__sub {
  text-align: center;
  font-size: clamp(1rem, 4vw, 1.25rem);
  color: var(--color-text-muted);
  margin-block-start: -0.6rem;
  margin-block-end: 2.5rem;
  font-weight: 500;
}

/* ---------- HEADER BLOCK ---------- */
.header {
  padding-block: 0.8rem;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-block-end: 1px solid rgba(15, 186, 168, 0.15);
}
.header__container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.header__logo {
  inline-size: 50px;
  block-size: 50px;
  object-fit: contain;
  transition: var(--transition-smooth);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.05));
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.9);
  padding: 6px;
  background-color: var(--color-primary);
}
.header__logo:hover {
  transform: scale(1.05) rotate(1deg);
  filter: drop-shadow(0 6px 12px rgba(15, 186, 168, 0.2));
  background: white;
}
@media (max-width: 480px) {
  .header__logo { inline-size: 42px; block-size: 42px; padding: 4px; }
}

/* navigation */
.nav {
  position: relative;
}
.nav__toggle {
  background: none;
  border: none;
  inline-size: 30px;
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
}
.nav__toggle-line {
  block-size: 3px;
  background: var(--color-secondary);
  border-radius: 4px;
}
.nav__list {
  display: flex;
  gap: 0.5rem;
  list-style: none;
}
.nav__link {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  text-decoration: none;
  font-weight: 600;
  color: var(--color-text-dark);
  border-radius: 2rem;
  transition: var(--transition-smooth);
  font-size: 0.95rem;
}
.nav__link:hover,
.nav__link:focus-visible {
  background: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-glow);
}
@media (max-width: 768px) {
  .nav__toggle { display: flex; }
  .nav__list {
    position: absolute;
    top: 55px;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(16px);
    flex-direction: column;
    inline-size: 240px;
    padding-block: 1rem;
    border-radius: 1.2rem;
    box-shadow: var(--shadow-md);
    gap: 0.25rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: all 0.25s ease;
    border: 1px solid rgba(0, 0, 0, 0.05);
  }
  .nav__list--open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .nav__link { display: block; padding: 0.75rem 1.8rem; border-radius: 0; }
}

/* ---------- HERO BLOCK ---------- */
.hero {
  min-block-size: 90vh;
  background: radial-gradient(circle at 10% 30%, rgba(15, 186, 168, 0.08) 0%, rgba(30, 47, 58, 0.02) 80%),
              url("https://images.unsplash.com/photo-1498050108023-c5249f4df085?w=1600&auto=format") center/cover no-repeat;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  isolation: isolate;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(2px);
  z-index: -1;
}
.hero__content {
  max-inline-size: 800px;
  padding: 2rem;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  border-radius: 2.5rem;
  box-shadow: var(--shadow-md);
  animation: fadeSlideUp 0.9s ease-out;
  text-align: center;
}
.hero__title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 800;
  background: linear-gradient(125deg, var(--color-primary-dark), var(--color-primary));
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  margin-block-end: 1rem;
}
.hero__text {
  font-size: 1.2rem;
  color: var(--color-secondary);
  font-weight: 500;
}
@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- FEATURES BLOCK ---------- */
.features {
  background-color: var(--color-gray-bg);
  padding-block: var(--section-spacing);
}
.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-block-start: 2rem;
}
.feature {
  background: var(--color-white);
  border-radius: var(--border-radius-card);
  padding: 2rem 1.8rem;
  text-align: center;
  transition: var(--transition-smooth);
  border: 1px solid rgba(0, 0, 0, 0.03);
  box-shadow: var(--shadow-sm);
}
.feature:hover {
  transform: translateY(-12px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}
.feature__icon {
  font-size: 3rem;
  background: linear-gradient(145deg, var(--color-primary), var(--color-primary-dark));
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  margin-block-end: 1.5rem;
  display: inline-block;
  animation: floatIcon 3s infinite ease-in-out;
}
.feature__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-block-end: 1rem;
}
.feature__desc {
  color: var(--color-text-muted);
  line-height: 1.6;
}
@keyframes floatIcon {
  0% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
  100% { transform: translateY(0); }
}

/* ---------- SERVICES BLOCK ---------- */
.services {
  padding-block: var(--section-spacing);
  background: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
}
.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2.5rem;
  margin-block-start: 3rem;
}
.service {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(2px);
  padding: 1.8rem;
  border-radius: 1.8rem;
  transition: var(--transition-smooth);
  border: 1px solid rgba(15, 186, 168, 0.08);
  box-shadow: var(--shadow-xs);
  min-block-size: 200px;
}
.service:hover {
  transform: translateY(-6px);
  background: white;
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-md);
}
@media (max-width: 680px) {
  .service { flex-direction: column; align-items: center; text-align: center; }
}
.service__icon {
  font-size: 2.2rem;
  background: linear-gradient(135deg, rgba(15, 186, 168, 0.12), rgba(15, 186, 168, 0.05));
  padding: 0.8rem;
  border-radius: 1.2rem;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  inline-size: 56px;
  block-size: 56px;
  color: var(--color-primary);
}
.service:hover .service__icon {
  background: var(--color-primary);
  color: white;
  transform: scale(1.02) rotate(2deg);
  box-shadow: var(--shadow-glow);
}
.service__title {
  font-weight: 700;
  font-size: 1.4rem;
  margin-block-end: 0.7rem;
  color: var(--color-secondary);
}
.service__text {
  color: var(--color-text-muted);
  line-height: 1.6;
  font-size: 0.95rem;
}
.services__image-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
}
.services__image {
  inline-size: 280px;
  block-size: 320px;
  object-fit: cover;
  border-radius: 2rem;
  box-shadow: 0 25px 35px -15px rgba(0, 0, 0, 0.2);
  transition: transform 0.5s ease;
}
.services__image-wrapper::before {
  content: "";
  position: absolute;
  background: var(--color-secondary);
  inline-size: 90px;
  block-size: calc(100% + 50px);
  top: -25px;
  inset-inline-end: 15px;
  z-index: -1;
  border-radius: 3rem;
  opacity: 0.7;
}
@media (max-width: 992px) { .services__image-wrapper { display: none; } }

/* ---------- PORTFOLIO BLOCK ---------- */
.portfolio {
  background: var(--color-gray-bg);
  padding-block: var(--section-spacing);
}
.portfolio__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  margin-block-start: 3rem;
}
.portfolio-card {
  background: white;
  border-radius: 1.5rem;
  overflow: hidden;
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-sm);
}
.portfolio-card:hover {
  transform: translateY(-12px);
  box-shadow: var(--shadow-md);
}
.portfolio-card__image {
  inline-size: 100%;
  block-size: 280px;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.portfolio-card:hover .portfolio-card__image { transform: scale(1.05); }
.portfolio-card__info { padding: 1.6rem; }
.portfolio-card__title { font-weight: 800; font-size: 1.25rem; margin-block-end: 0.5rem; }
.portfolio-card__desc { color: var(--color-text-muted); }

/* ---------- ABOUT BLOCK ---------- */
.about {
  padding-block: var(--section-spacing);
}
.about__container {
  display: flex;
  flex-wrap: wrap;
  gap: 3rem;
  align-items: center;
  margin-block-start: 3rem;
}
.about__image-wrapper {
  flex: 1;
  position: relative;
}
.about__image {
  inline-size: 100%;
  max-inline-size: 400px;
  border-radius: 2rem;
  box-shadow: var(--shadow-md);
}
.about__image-wrapper::before {
  content: "";
  position: absolute;
  background: #e5e7eb;
  inline-size: 100px;
  block-size: 100%;
  top: -25px;
  inset-inline-start: -30px;
  border-radius: 2rem;
  z-index: -1;
}
.about__content { flex: 1.2; }
.about__text {
  font-weight: 600;
  line-height: 1.7;
  font-size: 1.1rem;
}
.about__text--light {
  font-weight: 400;
  color: var(--color-text-muted);
}
.about__separator {
  inline-size: 90px;
  block-size: 4px;
  background: var(--color-primary);
  margin-block: 1.8rem;
  border: none;
  border-radius: 4px;
}
@media (max-width: 991px) {
  .about__container { flex-direction: column; text-align: center; }
  .about__separator { margin-inline: auto; }
  .about__image-wrapper::before { display: none; }
}

/* ---------- CONTACT BLOCK ---------- */
.contact {
  background: linear-gradient(120deg, #f9fafb 0%, #ffffff 100%);
  padding-block: var(--section-spacing);
}
.contact__info {
  text-align: center;
  background: white;
  max-inline-size: 700px;
  margin-inline: auto;
  padding: 2.5rem;
  border-radius: 2.5rem;
  box-shadow: var(--shadow-md);
}
.contact__label {
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  font-weight: 800;
  color: var(--color-secondary);
}
.contact__email {
  font-size: clamp(1.3rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--color-primary);
  background: #ecfdf5;
  padding: 0.5rem 1.8rem;
  border-radius: 4rem;
  text-decoration: none;
  display: inline-block;
  margin-block: 1.5rem;
  transition: 0.2s;
}
.contact__email:hover {
  background: var(--color-primary);
  color: white;
  transform: scale(1.02);
}
.contact__social {
  display: flex;
  justify-content: center;
  gap: 1.4rem;
  margin-block-start: 1rem;
  font-weight: 500;
}
.contact__social-link {
  color: var(--color-secondary);
  font-size: 1.7rem;
  transition: 0.2s;
}
.contact__social-link:hover {
  color: var(--color-primary);
  transform: translateY(-4px);
}

/* ---------- FOOTER ---------- */
.footer {
  background: var(--color-secondary);
  color: #e2e8f0;
  text-align: center;
  padding: 2rem;
  font-weight: 500;
}
.footer__highlight {
  color: var(--color-primary-light);
  font-weight: 800;
}

/* ---------- BACK TO TOP BUTTON ---------- */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
  inline-size: 48px;
  block-size: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  box-shadow: 0 4px 12px rgba(15, 186, 168, 0.3), var(--shadow-md);
  z-index: 99;
  cursor: pointer;
  backdrop-filter: blur(2px);
}
.back-to-top--visible {
  opacity: 1;
  visibility: visible;
}
.back-to-top:hover {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  transform: translateY(-6px) scale(1.05);
  box-shadow: 0 8px 20px rgba(15, 186, 168, 0.5);
}
.back-to-top:active { transform: translateY(-2px) scale(0.98); }
.back-to-top i {
  transition: transform 0.25s ease;
  font-size: 1.2rem;
}
.back-to-top:hover i { transform: translateY(-3px); }
@keyframes softPulse {
  0% { box-shadow: 0 0 0 0 rgba(15, 186, 168, 0.4); }
  70% { box-shadow: 0 0 0 10px rgba(15, 186, 168, 0); }
  100% { box-shadow: 0 0 0 0 rgba(15, 186, 168, 0); }
}
.back-to-top--visible { animation: softPulse 1.5s ease-out 1; }

/* focus & images */
a:focus-visible, button:focus-visible, .nav__link:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 4px;
}
img { max-inline-size: 100%; block-size: auto; display: block; }