/* ===========================
   Variables & Reset
   =========================== */
:root {
  --primary:        #0B7D8A;
  --primary-dark:   #096B77;
  --primary-light:  #EAF6F8;
  --accent:         #2BBCD4;
  --text:           #1A2733;
  --text-muted:     #5E7080;
  --bg:             #FAFCFD;
  --bg-alt:         #F0F7F9;
  --white:          #FFFFFF;
  --border:         #D6E8EC;
  --shadow-sm:      0 1px 4px rgba(0,0,0,0.07);
  --shadow-md:      0 4px 20px rgba(11,125,138,0.12);
  --shadow-lg:      0 12px 48px rgba(11,125,138,0.16);
  --radius:         14px;
  --radius-sm:      8px;
  --transition:     0.25s ease;
  --font-heading:   'Poppins', sans-serif;
  --font-body:      'Inter', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ===========================
   Layout Utilities
   =========================== */
.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 100px 0; }
.section--alt { background: var(--bg-alt); }

.section__header {
  text-align: center;
  max-width: 620px;
  margin: 0 auto 64px;
}
.section__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-light);
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 16px;
}
.section__header h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  line-height: 1.2;
}
.section__header p {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.75;
}

/* ===========================
   Buttons
   =========================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  white-space: nowrap;
}
.btn--primary {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}
.btn--primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn--outline-light {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.55);
}
.btn--outline-light:hover {
  background: rgba(255,255,255,0.14);
  border-color: var(--white);
}
.btn--lg { padding: 17px 40px; font-size: 1rem; border-radius: 10px; }
.btn--block { width: 100%; margin-top: 28px; }

/* ===========================
   Header & Nav
   =========================== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  padding: 22px 0;
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
}
.header--scrolled {
  background: var(--white);
  box-shadow: var(--shadow-sm);
  padding: 14px 0;
}

.nav {
  display: flex;
  align-items: center;
  gap: 36px;
}
.nav__logo {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--white);
  margin-right: auto;
  transition: color var(--transition);
  display: flex;
  align-items: center;
  gap: 0;
}
.logo-dss {
  color: var(--accent);
}
.header--scrolled .nav__logo { color: var(--text); }
.header--scrolled .logo-dss { color: var(--primary); }

.nav__links {
  display: flex;
  gap: 36px;
}
.nav__links a {
  font-size: 0.93rem;
  font-weight: 500;
  color: rgba(255,255,255,0.88);
  transition: color var(--transition);
}
.nav__links a:hover { color: var(--white); }
.header--scrolled .nav__links a { color: var(--text-muted); }
.header--scrolled .nav__links a:hover { color: var(--primary); }

.nav__cta {
  padding: 10px 24px;
  font-size: 0.9rem;
}
.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--white);
  padding: 4px;
}
.header--scrolled .nav__toggle { color: var(--text); }
.nav__toggle svg { display: block; }

/* ===========================
   Hero
   =========================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: url('momo_air-cleaning-services-9663247_1920.jpg') center top / cover no-repeat;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(9,107,119,0.90) 0%, rgba(11,40,60,0.78) 100%);
}
.hero__content {
  position: relative;
  z-index: 1;
  padding: 140px 24px 90px;
  max-width: 700px;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--white);
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.28);
  padding: 7px 18px;
  border-radius: 100px;
  margin-bottom: 28px;
  backdrop-filter: blur(6px);
}
.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.6rem, 6.5vw, 4.2rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1.1;
  margin-bottom: 22px;
  letter-spacing: -0.02em;
}
.hero__subtitle {
  font-size: clamp(1rem, 2.5vw, 1.18rem);
  color: rgba(255,255,255,0.84);
  max-width: 540px;
  margin-bottom: 44px;
  line-height: 1.75;
}
.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===========================
   Services
   =========================== */
.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
}
.service-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 38px 30px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.service-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}
.service-icon {
  width: 52px;
  height: 52px;
  background: var(--primary-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--primary);
}
.service-icon svg { width: 26px; height: 26px; }
.service-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}
.service-card p {
  color: var(--text-muted);
  font-size: 0.93rem;
  line-height: 1.65;
}

/* ===========================
   Features (Why Us)
   =========================== */
.features__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.features__image img {
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  height: 520px;
  width: 100%;
  object-fit: cover;
}
.features__content .section__tag { display: inline-block; margin-bottom: 14px; }
.features__content h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 36px;
  line-height: 1.2;
}
.features__list { display: flex; flex-direction: column; gap: 26px; }
.features__list li {
  display: flex;
  gap: 18px;
  align-items: flex-start;
}
.feature-check {
  flex-shrink: 0;
  width: 26px; height: 26px;
  background: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}
.feature-check svg { width: 14px; height: 14px; }
.features__list strong {
  display: block;
  font-size: 0.98rem;
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--text);
}
.features__list p {
  color: var(--text-muted);
  font-size: 0.91rem;
  line-height: 1.6;
}

/* ===========================
   About
   =========================== */
.about__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about__content .section__tag { display: inline-block; margin-bottom: 14px; }
.about__content h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 22px;
  line-height: 1.2;
}
.about__content p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 18px;
}
.about__image img {
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  height: 480px;
  width: 100%;
  object-fit: cover;
}

/* ===========================
   Gallery
   =========================== */
.gallery__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 16px;
  height: 360px;
}
.gallery__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius);
  transition: transform var(--transition), box-shadow var(--transition);
  overflow: hidden;
}
.gallery__img:hover {
  transform: scale(1.025);
  box-shadow: var(--shadow-lg);
}

/* ===========================
   Contact & Hours
   =========================== */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  max-width: 840px;
  margin: 0 auto;
}
.contact__info { display: flex; flex-direction: column; gap: 28px; }
.contact__item {
  display: flex;
  gap: 18px;
  align-items: flex-start;
}
.contact__item-icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  background: var(--primary-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}
.contact__item-icon svg { width: 20px; height: 20px; }
.contact__item strong {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-muted);
  margin-bottom: 5px;
}
.contact__item a,
.contact__item span {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text);
}
.contact__item a:hover { color: var(--primary); }

.hours { }
.hours h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 22px;
  color: var(--text);
}
.hours__list {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.hours__list li {
  display: flex;
  justify-content: space-between;
  padding: 11px 18px;
  font-size: 0.92rem;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.hours__list li:last-child { border-bottom: none; }
.hours__list li:nth-child(even) { background: var(--bg-alt); }
.hours__list li:hover { background: var(--primary-light); }
.hours__note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 12px;
}

/* ===========================
   Footer
   =========================== */
.footer {
  background: var(--text);
  color: rgba(255,255,255,0.65);
  padding: 64px 0 0;
}
.footer__content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer__brand-name {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--white);
  display: block;
  margin-bottom: 10px;
}
.footer__brand p {
  font-size: 0.9rem;
  max-width: 280px;
  line-height: 1.65;
  color: rgba(255,255,255,0.55);
}
.footer__nav { display: flex; gap: 32px; align-items: flex-start; margin-top: 6px; }
.footer__nav a {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}
.footer__nav a:hover { color: var(--white); }
.footer__bottom {
  padding: 22px 0;
  text-align: center;
  font-size: 0.83rem;
  color: rgba(255,255,255,0.4);
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 960px) {
  .features__layout,
  .about__layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .features__image { order: -1; }
  .features__image img,
  .about__image img { height: 380px; }

  .gallery__grid {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto;
    height: auto;
  }
  .gallery__img--wide { grid-column: 1 / -1; height: 260px; }
  .gallery__img:not(.gallery__img--wide) { height: 210px; }

  .contact__grid { grid-template-columns: 1fr; gap: 48px; }
  .footer__content { flex-direction: column; }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }

  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--white);
    flex-direction: column;
    gap: 0;
    box-shadow: var(--shadow-md);
    border-top: 1px solid var(--border);
    padding: 8px 0;
  }
  .nav__links--open { display: flex; }
  .nav__links a {
    color: var(--text-muted) !important;
    padding: 14px 24px;
    border-bottom: 1px solid var(--border);
    font-size: 1rem;
  }
  .nav__links a:last-child { border-bottom: none; }
  .nav__links a:hover { color: var(--primary) !important; background: var(--primary-light); }

  .nav__cta { display: none; }
  .nav__toggle { display: block; }

  .hero__actions { flex-direction: column; align-items: flex-start; }
  .hero__actions .btn { width: 100%; justify-content: center; }

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

  .gallery__grid {
    grid-template-columns: 1fr;
    height: auto;
  }
  .gallery__img--wide,
  .gallery__img { height: 250px; grid-column: auto; }

  .footer__nav { flex-direction: column; gap: 12px; }
}

@media (max-width: 480px) {
  .hero__title { font-size: 2.2rem; }
}