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

:root {
  --blue-primary: #2867b3;
  --blue-dark: #1a4f8a;
  --blue-light: #1686db;
  --cyan: #20a7c5;
  --cyan-light: #51c7e1;
  --dark: #1a1e23;
  --dark-2: #2a2d32;
  --gray: #555;
  --gray-light: #a6a6a6;
  --gray-bg: #f7f7f7;
  --white: #fff;
  --font-heading: 'Fjalla One', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-serif: 'Merriweather', serif;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  --transition: 0.3s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--dark);
  line-height: 1.7;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: color var(--transition); }
ul { list-style: none; }

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section { padding: 80px 0; }

.section__title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  color: var(--dark);
  margin-bottom: 24px;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.section__title--center { text-align: center; }

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 12px 28px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  border: 2px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition);
}

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

.btn--primary:hover {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
}

.btn--outline {
  background: transparent;
  color: var(--blue-primary);
  border-color: var(--blue-primary);
}

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

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

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

.btn--lg { padding: 16px 36px; font-size: 0.9rem; }

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  transition: box-shadow var(--transition);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  gap: 20px;
}

.header__logo img { height: 55px; width: auto; }

.nav__list {
  display: flex;
  gap: 32px;
}

.nav__link {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--dark);
  position: relative;
  padding-bottom: 4px;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--blue-primary);
  transition: width var(--transition);
}

.nav__link:hover::after,
.nav__link.active::after { width: 100%; }

.nav__link.active { color: var(--blue-primary); }

.header__cta { white-space: nowrap; }

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

.nav-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--dark);
  transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: url('../assets/images/hero.jpg') center/cover no-repeat;
  margin-top: 80px;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  color: var(--white);
  padding: 60px 20px;
}

.hero__brand {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--cyan-light);
  margin-bottom: 16px;
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.15;
  margin-bottom: 20px;
  text-transform: uppercase;
}

.hero__text {
  font-size: 1.05rem;
  opacity: 0.9;
  margin-bottom: 32px;
  line-height: 1.8;
}

/* ===== Tagline ===== */
.tagline {
  background: var(--blue-primary);
  padding: 20px 0;
  text-align: center;
}

.tagline__text {
  font-family: var(--font-heading);
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  color: var(--white);
  letter-spacing: 3px;
  text-transform: uppercase;
}

/* ===== About ===== */
.about { background: var(--white); }

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

.about__image img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: var(--shadow);
}

.about__content p {
  color: var(--gray);
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.about__content .btn { margin-top: 12px; }

/* ===== Services ===== */
.services { background: var(--gray-bg); }

.services__tabs {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.services__tab {
  padding: 14px 32px;
  font-family: var(--font-heading);
  font-size: 1rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  background: var(--white);
  border: 2px solid #ddd;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--gray);
}

.services__tab:first-child { border-radius: 4px 0 0 4px; }
.services__tab:last-child { border-radius: 0 4px 4px 0; }

.services__tab.active,
.services__tab:hover {
  background: var(--blue-primary);
  color: var(--white);
  border-color: var(--blue-primary);
}

.services__panel { display: none; }
.services__panel.active { display: block; }

.services__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.services__image img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: 4px;
}

.services__text p {
  color: var(--gray);
  margin-bottom: 24px;
  font-size: 0.95rem;
}

/* ===== CTA Banner ===== */
.cta-banner {
  background: linear-gradient(135deg, var(--cyan) 0%, var(--blue-primary) 100%);
  padding: 80px 0;
  text-align: center;
  color: var(--white);
}

.cta-banner__label {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 8px;
}

.cta-banner__title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 6vw, 4rem);
  letter-spacing: 4px;
  margin-bottom: 32px;
}

/* ===== Pool Models ===== */
.models { background: var(--white); }

.models__shapes {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.models__shape {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  letter-spacing: 1px;
  padding: 8px 20px;
  color: var(--gray-light);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
}

.models__shape.active,
.models__shape:hover {
  color: var(--blue-primary);
  border-bottom-color: var(--blue-primary);
}

.models__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.model-card {
  background: var(--white);
  border-radius: 4px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition);
}

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

.model-card__image img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.model-card__body {
  padding: 20px;
  text-align: center;
}

.model-card__body h3 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  color: var(--blue-primary);
  margin-bottom: 6px;
}

.model-card__body p {
  font-size: 0.85rem;
  color: var(--gray);
}

/* ===== Design Guide ===== */
.guide { background: var(--gray-bg); }

.guide__label {
  text-align: center;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  letter-spacing: 2px;
  color: var(--cyan);
  margin-bottom: 8px;
}

.guide__intro {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 40px;
  color: var(--gray);
  font-size: 0.95rem;
}

.guide__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  max-width: 800px;
  margin: 0 auto;
}

.guide__card { text-align: center; }

.guide__thumb {
  position: relative;
  height: 220px;
  background: linear-gradient(135deg, var(--blue-primary), var(--cyan));
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  cursor: pointer;
  transition: opacity var(--transition);
}

.guide__thumb:hover { opacity: 0.85; }

.guide__play {
  width: 60px;
  height: 60px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--blue-primary);
  padding-left: 4px;
}

.guide__card p {
  font-weight: 600;
  color: var(--dark);
}

/* ===== Eco ===== */
.eco { background: var(--white); }

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

.eco__label {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  letter-spacing: 2px;
  color: var(--cyan);
  margin-bottom: 8px;
}

.eco__content p {
  color: var(--gray);
  font-size: 0.95rem;
}

.eco__image img {
  width: 100%;
  height: 360px;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: var(--shadow);
}

/* ===== Calculator ===== */
.calculator { background: var(--gray-bg); }

.calculator__box {
  max-width: 600px;
  margin: 0 auto;
  background: var(--white);
  padding: 40px;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.calculator__box h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  text-align: center;
  margin-bottom: 28px;
  color: var(--blue-primary);
}

.calculator__form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}

.calculator__field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--dark);
}

.calculator__field input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 0.95rem;
  font-family: var(--font-body);
  transition: border-color var(--transition);
}

.calculator__field input:focus {
  outline: none;
  border-color: var(--blue-primary);
}

.calculator__form .btn {
  grid-column: 1 / -1;
  justify-self: center;
}

.calculator__result {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid #eee;
}

.calculator__result p {
  font-size: 0.9rem;
  color: var(--gray);
}

#volumeResult {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.5rem;
  color: var(--blue-primary);
  margin: 8px 0;
}

/* ===== Footer ===== */
.footer {
  background: var(--dark);
  color: var(--white);
  padding-top: 60px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}

.footer__logo { height: 50px; width: auto; margin-bottom: 16px; filter: brightness(0) invert(1); }

.footer__brand p {
  font-size: 0.9rem;
  opacity: 0.7;
  line-height: 1.7;
}

.footer__col h4 {
  font-family: var(--font-heading);
  font-size: 1rem;
  letter-spacing: 1px;
  margin-bottom: 16px;
  color: var(--cyan-light);
}

.footer__col li { margin-bottom: 10px; }

.footer__col a {
  font-size: 0.9rem;
  opacity: 0.75;
  line-height: 1.6;
}

.footer__col a:hover { opacity: 1; color: var(--cyan-light); }

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0;
  text-align: center;
}

.footer__bottom p {
  font-size: 0.85rem;
  opacity: 0.6;
}

.footer__credit {
  margin-top: 6px;
  font-size: 0.8rem !important;
}

.footer__credit a { color: var(--cyan-light); }
.footer__credit a:hover { text-decoration: underline; }

/* ===== Responsive ===== */
@media (max-width: 992px) {
  .about__grid,
  .services__grid,
  .eco__grid { grid-template-columns: 1fr; gap: 32px; }

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

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

@media (max-width: 768px) {
  .header__cta { display: none; }

  .nav-toggle { display: flex; }

  .nav {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow);
    transform: translateY(-120%);
    opacity: 0;
    transition: all var(--transition);
    pointer-events: none;
  }

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

  .nav__list {
    flex-direction: column;
    padding: 24px;
    gap: 0;
  }

  .nav__link {
    display: block;
    padding: 14px 0;
    border-bottom: 1px solid #eee;
  }

  .hero { min-height: 80vh; }

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

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

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

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

  .services__tab {
    flex: 1;
    text-align: center;
    padding: 12px 16px;
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  .section { padding: 50px 0; }

  .about__image img,
  .eco__image img { height: 260px; }
}