/* ============================================================
   LightAir Systems — Landing Page Stylesheet
   Premium IoT Air Quality Monitoring
   
   Design System: Clean / Minimalist / Premium
   Fonts: Outfit (headings) + Inter (body) via Google Fonts
   ============================================================ */

/* ──────────────────────────────────────────────
   0. GOOGLE FONTS IMPORT
   ────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Outfit:wght@500;600;700&display=swap');

/* ──────────────────────────────────────────────
   1. DESIGN TOKENS (CSS Custom Properties)
   ────────────────────────────────────────────── */
:root {
  /* — Colors — */
  --color-primary:          #2BB5B2;
  --color-primary-light:    #3DD4D0;
  --color-primary-dark:     #1A8A87;
  --color-secondary:        #0B1D2A;
  --color-secondary-light:  #132F45;
  --color-accent:           #14B8A6;

  --color-bg:               #FFFFFF;
  --color-bg-alt:           #F0FAFA;
  --color-bg-dark:          #0B1D2A;

  --color-text:             #0F172A;
  --color-text-muted:       #64748B;
  --color-text-light:       #94A3B8;

  --color-border:           #E2E8F0;
  --color-success:          #22C55E;
  --color-error:            #EF4444;

  /* — Typography — */
  --font-heading: 'Outfit', sans-serif;
  --font-body:    'Inter', sans-serif;

  --text-xs:   0.75rem;    /* 12px */
  --text-sm:   0.875rem;   /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg:   1.125rem;   /* 18px */
  --text-xl:   1.25rem;    /* 20px */
  --text-2xl:  1.5rem;     /* 24px */
  --text-3xl:  1.875rem;   /* 30px */
  --text-4xl:  2.25rem;    /* 36px */
  --text-5xl:  3rem;       /* 48px */
  --text-6xl:  3.75rem;    /* 60px */

  --leading-tight:  1.2;
  --leading-snug:   1.35;
  --leading-normal: 1.6;

  /* — Spacing Scale (4px base) — */
  --space-1:  0.25rem;     /* 4px */
  --space-2:  0.5rem;      /* 8px */
  --space-3:  0.75rem;     /* 12px */
  --space-4:  1rem;        /* 16px */
  --space-5:  1.25rem;     /* 20px */
  --space-6:  1.5rem;      /* 24px */
  --space-7:  1.75rem;     /* 28px */
  --space-8:  2rem;        /* 32px */
  --space-9:  2.25rem;     /* 36px */
  --space-10: 2.5rem;      /* 40px */
  --space-12: 3rem;        /* 48px */
  --space-14: 3.5rem;      /* 56px */
  --space-16: 4rem;        /* 64px */
  --space-18: 4.5rem;      /* 72px */
  --space-20: 5rem;        /* 80px */
  --space-24: 6rem;        /* 96px */

  /* — Border Radius — */
  --radius-sm:   0.375rem;   /* 6px */
  --radius-md:   0.5rem;     /* 8px */
  --radius-lg:   0.75rem;    /* 12px */
  --radius-xl:   1rem;       /* 16px */
  --radius-2xl:  1.5rem;     /* 24px */
  --radius-full: 9999px;

  /* — Shadows — */
  --shadow-sm:    0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md:    0 4px 6px -1px rgba(0, 0, 0, 0.07),
                  0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg:    0 10px 15px -3px rgba(0, 0, 0, 0.08),
                  0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl:    0 20px 25px -5px rgba(0, 0, 0, 0.1),
                  0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-2xl:   0 25px 50px -12px rgba(0, 0, 0, 0.15);
  --shadow-glow:  0 0 30px rgba(43, 181, 178, 0.25);
  --shadow-glow-lg: 0 0 60px rgba(43, 181, 178, 0.35);

  /* — Transitions — */
  --ease-out:     cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out:  cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring:  cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast:   150ms;
  --duration-normal: 300ms;
  --duration-slow:   500ms;

  /* — Layout — */
  --container-sm:  640px;
  --container-md:  768px;
  --container-lg:  1024px;
  --container-xl:  1200px;
  --container-2xl: 1400px;
  --navbar-height: 100px;

  /* — Z-index — */
  --z-dropdown: 100;
  --z-sticky:   200;
  --z-overlay:  500;
  --z-modal:    600;
  --z-navbar:   1000;
}


/* ──────────────────────────────────────────────
   2. CSS RESET & BASE
   ────────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  font-size: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: var(--leading-tight);
  color: var(--color-text);
  overflow-wrap: break-word;
}

p {
  overflow-wrap: break-word;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}


/* ──────────────────────────────────────────────
   3. LAYOUT UTILITIES
   ────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-8);
  }
}

@media (min-width: 1280px) {
  .container {
    padding-inline: var(--space-10);
  }
}

.section {
  padding-block: var(--space-16);
}

@media (min-width: 768px) {
  .section {
    padding-block: var(--space-20);
  }
}

@media (min-width: 1024px) {
  .section {
    padding-block: var(--space-24);
  }
}


/* ──────────────────────────────────────────────
   4. SECTION HEADER COMPONENT
   ────────────────────────────────────────────── */
.section-header {
  text-align: center;
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: var(--space-12);
}

@media (min-width: 768px) {
  .section-header {
    margin-bottom: var(--space-16);
  }
}

.section-header__eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section-header__title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

@media (min-width: 768px) {
  .section-header__title {
    font-size: var(--text-3xl);
  }
}

@media (min-width: 1024px) {
  .section-header__title {
    font-size: var(--text-4xl);
  }
}

.section-header__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
  max-width: 560px;
  margin-inline: auto;
}

@media (min-width: 768px) {
  .section-header__subtitle {
    font-size: var(--text-lg);
  }
}

/* Dark variant for dark-bg sections */
.section-header--light .section-header__title {
  color: var(--color-bg);
}

.section-header--light .section-header__subtitle {
  color: var(--color-text-light);
}


/* ──────────────────────────────────────────────
   5. BUTTON COMPONENTS
   ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background-color var(--duration-normal) var(--ease-out),
    color var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

@media (min-width: 768px) {
  .btn {
    padding: var(--space-3) var(--space-8);
    font-size: var(--text-base);
  }
}

/* Primary — filled teal */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-bg);
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary-light);
  box-shadow: 0 8px 24px rgba(43, 181, 178, 0.3);
}

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

/* Secondary — outlined teal */
.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-bg);
  box-shadow: 0 8px 24px rgba(43, 181, 178, 0.2);
}

.btn-secondary:active {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: var(--color-bg);
}

/* White variant for dark sections */
.btn-white {
  background-color: var(--color-bg);
  color: var(--color-secondary);
  border-color: var(--color-bg);
}

.btn-white:hover {
  background-color: rgba(255, 255, 255, 0.9);
  box-shadow: 0 8px 24px rgba(255, 255, 255, 0.2);
}

/* Large button variant */
.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

@media (min-width: 768px) {
  .btn-lg {
    padding: var(--space-4) var(--space-10);
    font-size: var(--text-lg);
  }
}

/* Button icon */
.btn__icon {
  width: 1.25em;
  height: 1.25em;
  flex-shrink: 0;
}


/* ──────────────────────────────────────────────
   6. CARD COMPONENT (base)
   ────────────────────────────────────────────── */
.card {
  background-color: var(--color-bg);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  transition:
    transform var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out);
}

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

@media (min-width: 768px) {
  .card {
    padding: var(--space-8);
  }
}


/* ──────────────────────────────────────────────
   7. NAVBAR
   ────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--navbar-height);
  z-index: var(--z-navbar);
  background-color: transparent;
  transition:
    background-color var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out),
    backdrop-filter var(--duration-normal) var(--ease-out);
}

.navbar.scrolled {
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md);
}

.navbar__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

@media (min-width: 768px) {
  .navbar__container {
    padding-inline: var(--space-8);
  }
}

/* Logo */
.navbar__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  z-index: calc(var(--z-navbar) + 1);
}

.navbar__logo img {
  height: 64px;
  width: auto;
}

@media (min-width: 768px) {
  .navbar__logo img {
    height: 80px;
  }
}

.navbar__logo-text {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-secondary);
  transition: color var(--duration-normal) var(--ease-out);
}

/* Nav menu */
.nav-menu {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  position: fixed;
  top: 0;
  right: 0;
  width: 100%;
  height: 100dvh;
  background-color: rgba(11, 29, 42, 0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transform: translateX(100%);
  transition: transform var(--duration-slow) var(--ease-out);
  z-index: var(--z-navbar);
}

.nav-menu.active {
  transform: translateX(0);
}

@media (min-width: 1024px) {
  .nav-menu {
    position: static;
    flex-direction: row;
    width: auto;
    height: auto;
    background-color: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    transform: none;
    gap: var(--space-1);
  }
}

/* Nav link */
.nav-menu__link {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-bg);
  border-radius: var(--radius-md);
  transition:
    color var(--duration-normal) var(--ease-out),
    background-color var(--duration-normal) var(--ease-out);
}

.nav-menu__link:hover {
  color: var(--color-primary-light);
}

@media (min-width: 1024px) {
  .nav-menu__link {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    padding: var(--space-2) var(--space-3);
  }

  .nav-menu__link:hover {
    color: var(--color-primary);
    background-color: var(--color-bg-alt);
  }

  .navbar.scrolled .nav-menu__link {
    color: var(--color-text-muted);
  }

  .navbar.scrolled .nav-menu__link:hover {
    color: var(--color-primary);
  }
}

/* Nav CTA button */
.nav-menu__cta {
  margin-top: var(--space-4);
}

@media (min-width: 1024px) {
  .nav-menu__cta {
    margin-top: 0;
    margin-left: var(--space-4);
  }
}

/* Hamburger toggle */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  z-index: calc(var(--z-navbar) + 1);
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-secondary);
  border-radius: var(--radius-full);
  transition:
    transform var(--duration-normal) var(--ease-out),
    opacity var(--duration-normal) var(--ease-out),
    background-color var(--duration-normal) var(--ease-out);
}

/* Hamburger → X transformation */
.nav-toggle.active .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background-color: var(--color-bg);
}

.nav-toggle.active .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background-color: var(--color-bg);
}

@media (min-width: 1024px) {
  .nav-toggle {
    display: none;
  }
}


/* ──────────────────────────────────────────────
   8. HERO SECTION
   ────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--navbar-height);
  overflow: hidden;
  background-color: var(--color-bg);
}

/* ── Decorative shapes from LEFT side ── */
.hero::before {
  content: '';
  position: absolute;
  top: -15%;
  left: -10%;
  width: 55%;
  height: 130%;
  background:
    radial-gradient(
      ellipse 70% 60% at 30% 40%,
      rgba(43, 181, 178, 0.12) 0%,
      transparent 70%
    ),
    radial-gradient(
      ellipse 50% 50% at 15% 70%,
      rgba(20, 184, 166, 0.1) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 40% 45% at 40% 20%,
      rgba(11, 29, 42, 0.06) 0%,
      transparent 55%
    );
  z-index: 0;
  animation: gradient-shift 12s ease-in-out infinite alternate;
}

.hero::after {
  content: '';
  position: absolute;
  top: 10%;
  left: -5%;
  width: 40%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(
    circle at 50% 50%,
    rgba(43, 181, 178, 0.08) 0%,
    rgba(43, 181, 178, 0.04) 40%,
    transparent 70%
  );
  z-index: 0;
  animation: gradient-shift 16s ease-in-out infinite alternate-reverse;
}

/* Additional decorative circle via a child element */
.hero__shapes {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.hero__shapes::before {
  content: '';
  position: absolute;
  bottom: -20%;
  left: 5%;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(43, 181, 178, 0.07) 0%,
    transparent 70%
  );
}

.hero__shapes::after {
  content: '';
  position: absolute;
  top: 15%;
  left: 25%;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 1px solid rgba(43, 181, 178, 0.1);
  animation: pulse-glow 6s ease-in-out infinite;
}

/* Hero container layout */
.hero__container {
  display: flex;
  flex-direction: column-reverse;
  align-items: center;
  gap: var(--space-10);
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

@media (min-width: 768px) {
  .hero__container {
    padding-inline: var(--space-8);
    gap: var(--space-12);
  }
}

@media (min-width: 1024px) {
  .hero__container {
    flex-direction: row;
    gap: var(--space-12);
  }
}

/* Hero text block (left) */
.hero__content {
  text-align: center;
  flex: 1;
}

@media (min-width: 1024px) {
  .hero__content {
    text-align: left;
    flex: 0 0 58%;
    max-width: 58%;
  }
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  background-color: rgba(43, 181, 178, 0.08);
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.hero__title {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  .hero__title {
    font-size: var(--text-4xl);
  }
}

@media (min-width: 1024px) {
  .hero__title {
    font-size: var(--text-5xl);
    margin-bottom: var(--space-6);
  }
}

@media (min-width: 1440px) {
  .hero__title {
    font-size: var(--text-6xl);
  }
}

.hero__title-highlight {
  color: var(--color-primary);
}

.hero__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
  max-width: 520px;
  margin-bottom: var(--space-8);
}

@media (min-width: 768px) {
  .hero__subtitle {
    font-size: var(--text-lg);
  }
}

@media (min-width: 1024px) {
  .hero__subtitle {
    margin-inline: 0;
  }
}

.hero__subtitle:not([style]) {
  margin-inline: auto;
}

@media (min-width: 1024px) {
  .hero__subtitle {
    margin-inline: unset;
  }
}

.hero__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: center;
}

@media (min-width: 480px) {
  .hero__actions {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

@media (min-width: 1024px) {
  .hero__actions {
    justify-content: flex-start;
  }
}

/* Hero image block (right) */
.hero__visual {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

@media (min-width: 1024px) {
  .hero__visual {
    flex: 0 0 40%;
    max-width: 40%;
  }
}

.hero__image-wrapper {
  position: relative;
  width: 260px;
  max-width: 100%;
}

@media (min-width: 768px) {
  .hero__image-wrapper {
    width: 340px;
  }
}

@media (min-width: 1024px) {
  .hero__image-wrapper {
    width: 100%;
    max-width: 420px;
  }
}

.hero__image {
  position: relative;
  z-index: 1;
  animation: float 6s var(--ease-in-out) infinite;
  filter: drop-shadow(0 20px 40px rgba(43, 181, 178, 0.2));
}

/* Glow / halo behind the product image */
.hero__image-wrapper::before {
  content: '';
  position: absolute;
  inset: 10%;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(43, 181, 178, 0.2) 0%,
    rgba(43, 181, 178, 0.08) 40%,
    transparent 70%
  );
  filter: blur(30px);
  z-index: 0;
  animation: pulse-glow 4s ease-in-out infinite;
}


/* ──────────────────────────────────────────────
   9. PROBLEMS SECTION (#problemas)
   ────────────────────────────────────────────── */
.problems {
  background-color: var(--color-bg-alt);
}

.problems__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .problems__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
  }
}

@media (min-width: 1024px) {
  .problems__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Problem card */
.problem-card {
  background-color: var(--color-bg);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  text-align: center;
  transition:
    transform var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out);
}

.problem-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

@media (min-width: 768px) {
  .problem-card {
    padding: var(--space-8);
  }
}

.problem-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-bg);
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
  box-shadow: 0 4px 14px rgba(43, 181, 178, 0.25);
}

@media (min-width: 768px) {
  .problem-card__icon {
    width: 64px;
    height: 64px;
    font-size: var(--text-2xl);
    margin-bottom: var(--space-5);
  }
}

.problem-card__icon img,
.problem-card__icon svg {
  width: 28px;
  height: 28px;
}

.problem-card__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.problem-card__description {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
}


/* ──────────────────────────────────────────────
   10. HOW IT WORKS SECTION (#como-funciona)
   ────────────────────────────────────────────── */
.how-it-works {
  background-color: var(--color-bg);
}

.steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-10);
  position: relative;
  max-width: 900px;
  margin-inline: auto;
}

@media (min-width: 768px) {
  .steps {
    flex-direction: row;
    gap: var(--space-8);
    align-items: flex-start;
  }
}

/* Connecting line (vertical on mobile, horizontal on desktop) */
.steps::before {
  content: '';
  position: absolute;
  background-color: var(--color-border);
}

/* Mobile: vertical line */
@media (max-width: 767px) {
  .steps::before {
    left: 27px;
    top: 56px;
    bottom: 56px;
    width: 2px;
  }
}

/* Desktop: horizontal line */
@media (min-width: 768px) {
  .steps::before {
    top: 32px;
    left: calc(16.666% + 32px);
    right: calc(16.666% + 32px);
    height: 2px;
  }
}

/* Step item */
.step {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  position: relative;
  z-index: 1;
}

@media (min-width: 768px) {
  .step {
    flex: 1;
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}

/* Step number circle */
.step__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  min-width: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: var(--color-bg);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  box-shadow: 0 6px 20px rgba(43, 181, 178, 0.3);
}

@media (min-width: 768px) {
  .step__number {
    width: 64px;
    height: 64px;
    min-width: 64px;
    font-size: var(--text-2xl);
    margin-bottom: var(--space-4);
  }
}

.step__content {
  padding-top: var(--space-2);
}

@media (min-width: 768px) {
  .step__content {
    padding-top: 0;
  }
}

.step__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.step__description {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
}

@media (min-width: 768px) {
  .step__description {
    max-width: 260px;
    margin-inline: auto;
  }
}


/* ──────────────────────────────────────────────
   11. FOR WHOM SECTION (#para-quem) — DARK
   ────────────────────────────────────────────── */
.for-whom {
  background: linear-gradient(
    170deg,
    var(--color-bg-dark) 0%,
    var(--color-secondary-light) 100%
  );
}

.for-whom__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .for-whom__grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-6);
  }
}

/* Glassmorphism segment card */
.segment-card {
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition:
    border-color var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out),
    transform var(--duration-normal) var(--ease-out),
    background var(--duration-normal) var(--ease-out);
}

.segment-card:hover {
  border-color: rgba(43, 181, 178, 0.4);
  box-shadow: 0 0 30px rgba(43, 181, 178, 0.12),
              inset 0 0 30px rgba(43, 181, 178, 0.03);
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-4px);
}

@media (min-width: 768px) {
  .segment-card {
    padding: var(--space-8);
  }
}

.segment-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: rgba(43, 181, 178, 0.12);
  color: var(--color-primary-light);
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}

.segment-card__icon img,
.segment-card__icon svg {
  width: 24px;
  height: 24px;
}

.segment-card__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-bg);
  margin-bottom: var(--space-2);
}

.segment-card__description {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  line-height: var(--leading-normal);
}


/* ──────────────────────────────────────────────
   12. DIFFERENTIALS SECTION (#diferenciais)
   ────────────────────────────────────────────── */
.differentials {
  background-color: var(--color-bg);
}

.differentials__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .differentials__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
  }
}

@media (min-width: 1024px) {
  .differentials__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Differential card */
.differential-card {
  background-color: var(--color-bg);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-primary);
  transition:
    transform var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out);
}

.differential-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

@media (min-width: 768px) {
  .differential-card {
    padding: var(--space-8);
  }
}

.differential-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background-color: var(--color-bg-alt);
  color: var(--color-primary);
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
  transition: background-color var(--duration-normal) var(--ease-out);
}

.differential-card:hover .differential-card__icon {
  background-color: rgba(43, 181, 178, 0.12);
}

.differential-card__icon img,
.differential-card__icon svg {
  width: 24px;
  height: 24px;
}

.differential-card__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.differential-card__description {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
}


/* ──────────────────────────────────────────────
   13. CONTACT / CTA SECTION (#contato)
   ────────────────────────────────────────────── */
.contact {
  background: linear-gradient(
    135deg,
    var(--color-primary-dark) 0%,
    var(--color-secondary) 60%,
    var(--color-bg-dark) 100%
  );
  position: relative;
  overflow: hidden;
}

/* Decorative orb behind form */
.contact::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(43, 181, 178, 0.12) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.contact__container {
  display: flex;
  flex-direction: column;
  gap: var(--space-10);
  position: relative;
  z-index: 1;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

@media (min-width: 768px) {
  .contact__container {
    padding-inline: var(--space-8);
  }
}

@media (min-width: 1024px) {
  .contact__container {
    flex-direction: row;
    gap: var(--space-16);
    align-items: flex-start;
  }
}

/* Left column: text + contact info */
.contact__info {
  flex: 1;
}

.contact__title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-bg);
  margin-bottom: var(--space-4);
}

@media (min-width: 768px) {
  .contact__title {
    font-size: var(--text-3xl);
  }
}

@media (min-width: 1024px) {
  .contact__title {
    font-size: var(--text-4xl);
  }
}

.contact__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-light);
  line-height: var(--leading-normal);
  margin-bottom: var(--space-8);
  max-width: 460px;
}

@media (min-width: 768px) {
  .contact__subtitle {
    font-size: var(--text-lg);
  }
}

/* Contact info cards */
.contact__cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.contact-info-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  transition:
    background var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out);
}

.contact-info-card:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(43, 181, 178, 0.3);
}

.contact-info-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  min-width: 40px;
  border-radius: var(--radius-md);
  background: rgba(43, 181, 178, 0.15);
  color: var(--color-primary-light);
  font-size: var(--text-lg);
}

.contact-info-card__icon img,
.contact-info-card__icon svg {
  width: 20px;
  height: 20px;
}

.contact-info-card__label {
  font-size: var(--text-xs);
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-1);
}

.contact-info-card__value {
  font-size: var(--text-sm);
  color: var(--color-bg);
  font-weight: 500;
}

/* Right column: form */
.contact__form-wrapper {
  flex: 1;
  max-width: 520px;
  width: 100%;
}

@media (min-width: 1024px) {
  .contact__form-wrapper {
    max-width: none;
  }
}

.contact-form {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
}

@media (min-width: 768px) {
  .contact-form {
    padding: var(--space-8);
  }
}

@media (min-width: 1024px) {
  .contact-form {
    padding: var(--space-10);
  }
}

.contact-form__title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-bg);
  margin-bottom: var(--space-6);
}

/* Form fields */
.form-group {
  margin-bottom: var(--space-4);
}

.form-group__label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-light);
  margin-bottom: var(--space-2);
}

.form-group__input,
.form-group__textarea,
.form-group__select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-bg);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  outline: none;
  transition:
    border-color var(--duration-normal) var(--ease-out),
    background var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out);
}

.form-group__input::placeholder,
.form-group__textarea::placeholder {
  color: rgba(255, 255, 255, 0.35);
}

.form-group__input:focus,
.form-group__textarea:focus,
.form-group__select:focus {
  border-color: var(--color-primary);
  background: rgba(255, 255, 255, 0.1);
  box-shadow: 0 0 0 3px rgba(43, 181, 178, 0.15);
}

.form-group__textarea {
  min-height: 120px;
  resize: vertical;
}

.form-group__select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394A3B8' d='M6 8.825L.35 3.175l.7-.7L6 7.425l4.95-4.95.7.7z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-4) center;
  padding-right: var(--space-10);
}

.form-group__select option {
  background-color: var(--color-secondary);
  color: var(--color-bg);
}

/* Error state */
.form-group--error .form-group__input,
.form-group--error .form-group__textarea {
  border-color: var(--color-error);
}

.form-group__error-message {
  font-size: var(--text-xs);
  color: var(--color-error);
  margin-top: var(--space-1);
  display: none;
}

.form-group--error .form-group__error-message {
  display: block;
}

/* Success state */
.form-group--success .form-group__input,
.form-group--success .form-group__textarea {
  border-color: var(--color-success);
}

/* Submit button */
.contact-form__submit {
  width: 100%;
  margin-top: var(--space-6);
}

/* Form row (side-by-side fields) */
.form-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .form-row {
    flex-direction: row;
  }

  .form-row .form-group {
    flex: 1;
  }
}

/* ── Field-level error message ── */
.field-error {
  display: none;
  font-size: var(--text-xs);
  color: var(--color-error);
  margin-top: var(--space-1);
}

/* Error state via JS: .error class on the input itself */
.form-group__input.error,
.form-group__textarea.error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.form-group__input.error + .field-error,
.form-group__textarea.error + .field-error {
  display: block;
}

/* ── Form Success Toast ── */
.form-success {
  display: none;
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity 0.4s var(--ease-out),
    transform 0.4s var(--ease-out);
}

.form-success.active {
  opacity: 1;
  transform: translateY(0);
}

/* ── Active nav link highlight ── */
.nav-menu__link.active {
  color: var(--color-primary);
}

@media (min-width: 1024px) {
  .nav-menu__link.active {
    color: var(--color-primary);
    background-color: rgba(43, 181, 178, 0.08);
  }
}

/* ── Submit button loading state ── */
.btn.loading {
  opacity: 0.7;
  pointer-events: none;
}

/* ── Spinner animation ── */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.spinner {
  animation: spin 1s linear infinite;
  display: inline-block;
  vertical-align: middle;
}



/* ──────────────────────────────────────────────
   14. FOOTER
   ────────────────────────────────────────────── */
.footer {
  background-color: #071420;
  color: var(--color-text-light);
  padding-top: var(--space-12);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer__container {
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

@media (min-width: 768px) {
  .footer__container {
    padding-inline: var(--space-8);
  }
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  padding-bottom: var(--space-10);
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-10);
  }
}

/* Footer brand column */
.footer__brand {
  max-width: 320px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.footer__logo img {
  height: 36px;
  width: auto;
}

.footer__logo-text {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-bg);
}

.footer__description {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  line-height: var(--leading-normal);
  margin-bottom: var(--space-5);
}

/* Social icons */
.footer__social {
  display: flex;
  gap: var(--space-3);
}

.footer__social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text-light);
  transition:
    background-color var(--duration-normal) var(--ease-out),
    color var(--duration-normal) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.footer__social-link:hover {
  background-color: var(--color-primary);
  color: var(--color-bg);
  transform: translateY(-2px);
}

.footer__social-link svg,
.footer__social-link img {
  width: 18px;
  height: 18px;
}

/* Footer link columns */
.footer__column-title {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-bg);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-4);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  transition: color var(--duration-normal) var(--ease-out);
}

.footer__link:hover {
  color: var(--color-primary-light);
}

/* Footer bottom bar */
.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-block: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer__copyright {
  font-size: var(--text-xs);
  color: var(--color-text-light);
}

.footer__bottom-links {
  display: flex;
  gap: var(--space-4);
}

.footer__bottom-link {
  font-size: var(--text-xs);
  color: var(--color-text-light);
  transition: color var(--duration-normal) var(--ease-out);
}

.footer__bottom-link:hover {
  color: var(--color-primary-light);
}


/* ──────────────────────────────────────────────
   15. KEYFRAME ANIMATIONS
   ────────────────────────────────────────────── */

/* Floating (hero product image) */
@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-14px);
  }
}

/* Pulsing glow (halo behind product) */
@keyframes pulse-glow {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.6;
    transform: scale(1.08);
  }
}

/* Gradient shift (hero background shapes) */
@keyframes gradient-shift {
  0% {
    transform: translate(0, 0) scale(1);
  }
  100% {
    transform: translate(3%, 3%) scale(1.06);
  }
}

/* Fade-in on page load */
@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}


/* ──────────────────────────────────────────────
   16. SCROLL REVEAL ANIMATIONS
   ────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.7s var(--ease-out),
    transform 0.7s var(--ease-out);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-30px);
  transition:
    opacity 0.7s var(--ease-out),
    transform 0.7s var(--ease-out);
}

.reveal-right {
  opacity: 0;
  transform: translateX(30px);
  transition:
    opacity 0.7s var(--ease-out),
    transform 0.7s var(--ease-out);
}

.reveal.visible,
.reveal-left.visible,
.reveal-right.visible {
  opacity: 1;
  transform: translate(0, 0);
}

/* Staggered delays */
.reveal-delay-1 { transition-delay: 100ms; }
.reveal-delay-2 { transition-delay: 200ms; }
.reveal-delay-3 { transition-delay: 300ms; }
.reveal-delay-4 { transition-delay: 400ms; }
.reveal-delay-5 { transition-delay: 500ms; }
.reveal-delay-6 { transition-delay: 600ms; }


/* ──────────────────────────────────────────────
   17. UTILITY CLASSES
   ────────────────────────────────────────────── */
.text-center  { text-align: center; }
.text-left    { text-align: left; }
.text-right   { text-align: right; }

.text-primary  { color: var(--color-primary); }
.text-muted    { color: var(--color-text-muted); }
.text-white    { color: var(--color-bg); }

.bg-white     { background-color: var(--color-bg); }
.bg-alt       { background-color: var(--color-bg-alt); }
.bg-dark      { background-color: var(--color-bg-dark); }

.mx-auto      { margin-inline: auto; }
.mt-4         { margin-top: var(--space-4); }
.mt-8         { margin-top: var(--space-8); }
.mb-4         { margin-bottom: var(--space-4); }
.mb-8         { margin-bottom: var(--space-8); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms;
    animation-iteration-count: 1;
    transition-duration: 0.01ms;
    scroll-behavior: auto;
  }

  .reveal,
  .reveal-left,
  .reveal-right {
    opacity: 1;
    transform: none;
    transition: none;
  }
}


/* ──────────────────────────────────────────────
   18. RESPONSIVE FINE-TUNING
   ────────────────────────────────────────────── */

/* Tablet (768px) */
@media (min-width: 768px) {
  .hero__eyebrow {
    font-size: var(--text-sm);
  }
}

/* Desktop (1024px) — major layout shifts handled above */

/* Large (1280px) */
@media (min-width: 1280px) {
  .hero__title {
    letter-spacing: -0.025em;
  }

  .section-header__title {
    font-size: var(--text-4xl);
  }

  .problems__grid,
  .differentials__grid {
    gap: var(--space-8);
  }

  .contact__container {
    gap: var(--space-20);
  }
}

/* XL (1440px) */
@media (min-width: 1440px) {
  .container {
    max-width: var(--container-2xl);
  }

  .section-header__title {
    font-size: calc(var(--text-4xl) + 0.25rem);
  }
}


/* ──────────────────────────────────────────────
   19. CUSTOM SCROLLBAR (webkit)
   ────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-light);
}

/* Firefox scrollbar */
html {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) var(--color-bg);
}


/* ──────────────────────────────────────────────
   20. SELECTION / FOCUS STYLES
   ────────────────────────────────────────────── */
::selection {
  background-color: rgba(43, 181, 178, 0.2);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Remove focus ring for mouse users */
:focus:not(:focus-visible) {
  outline: none;
}

/* ── Floating WhatsApp ── */
.whatsapp-float {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 60px;
  height: 60px;
  background-color: #25D366;
  color: #FFF;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4);
  z-index: 1000;
  transition: transform var(--duration-normal) var(--ease-out), box-shadow var(--duration-normal) var(--ease-out);
}

.whatsapp-float:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 8px 16px rgba(37, 211, 102, 0.5);
  color: #FFF;
}