/* ========================================
   Zamba Design System — CSS
   ======================================== */

/* --- Design Tokens --- */
:root {
  --color-ochre: #C67B3C;
  --color-ochre-dark: #A8652F;
  --color-forest: #2D5016;
  --color-terracotta: #E07850;
  --color-terracotta-dark: #C4623C;
  --color-warm-white: #FAF7F2;
  --color-sand: #F0E9DF;
  --color-sand-dark: #E5DDD0;
  --color-soil: #2A2017;
  --color-clay: #8A7B6B;
  --color-wheat: #DDD5C8;
  --color-white: #FFFFFF;

  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  --text-display: 4rem;
  --text-h1: 3rem;
  --text-h2: 2.25rem;
  --text-h3: 1.5rem;
  --text-body-lg: 1.125rem;
  --text-body: 1rem;
  --text-body-sm: 0.875rem;
  --text-caption: 0.8125rem;
  --text-label: 0.75rem;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  --container-max: 1200px;
  --container-padding: 1.5rem;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 3px rgba(42, 32, 23, 0.06);
  --shadow-md: 0 4px 12px rgba(42, 32, 23, 0.08);
  --shadow-lg: 0 8px 30px rgba(42, 32, 23, 0.1);

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-soil);
  background-color: var(--color-warm-white);
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; font-size: inherit; }
input, textarea, select { font-family: inherit; font-size: inherit; }
h1, h2, h3, h4 { line-height: 1.15; font-weight: 400; }

/* --- Container & Section --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.section { padding: var(--space-5xl) 0; }
.section--sand { background-color: var(--color-sand); }
.section--dark { background-color: var(--color-soil); color: var(--color-warm-white); }

.section__header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-4xl);
}

.section__label {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-label);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ochre);
  margin-bottom: var(--space-md);
}

.section__label--light { color: var(--color-terracotta); }

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  color: var(--color-soil);
  margin-bottom: var(--space-lg);
}

.section__title--light { color: var(--color-warm-white); }

.section__subtitle {
  font-size: var(--text-body-lg);
  color: var(--color-clay);
  line-height: 1.7;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn--sm { padding: 0.5rem 1.25rem; font-size: var(--text-body-sm); }
.btn--lg { padding: 0.875rem 2rem; font-size: var(--text-body); }
.btn--full { width: 100%; }

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

.btn--primary:hover {
  background-color: var(--color-terracotta-dark);
  border-color: var(--color-terracotta-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(224, 120, 80, 0.3);
}

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

.btn--outline {
  background-color: transparent;
  color: var(--color-soil);
  border-color: var(--color-wheat);
}

.btn--outline:hover {
  border-color: var(--color-clay);
  background-color: var(--color-sand);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-soil);
  border-color: var(--color-wheat);
}

.btn--ghost:hover {
  background-color: var(--color-sand);
  border-color: var(--color-clay);
}

.section--dark .btn--ghost {
  color: var(--color-warm-white);
  border-color: rgba(250, 247, 242, 0.3);
}

.section--dark .btn--ghost:hover {
  background-color: rgba(250, 247, 242, 0.1);
  border-color: rgba(250, 247, 242, 0.5);
}

.btn:focus-visible,
.nav__link:focus-visible,
.form__input:focus-visible {
  outline: 2px solid var(--color-ochre);
  outline-offset: 2px;
}

/* --- Header / Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(250, 247, 242, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-wheat);
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.header--scrolled { box-shadow: var(--shadow-sm); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-soil);
  z-index: 10;
}

.nav__logo-icon { color: var(--color-ochre); font-size: 1.25rem; }

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: var(--text-body-sm);
  font-weight: 500;
  color: var(--color-clay);
  transition: color var(--transition-fast);
  position: relative;
}

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

.nav__link:hover { color: var(--color-soil); }
.nav__link:hover::after { width: 100%; }

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 10;
}

.nav__toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-soil);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-warm-white);
  z-index: 999;
  padding: var(--space-2xl) var(--container-padding);
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.mobile-menu.is-open {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.mobile-menu__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.mobile-menu__link {
  font-size: var(--text-h3);
  font-family: var(--font-display);
  color: var(--color-soil);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-wheat);
}

.mobile-menu__link--cta {
  color: var(--color-terracotta);
  border-bottom: none;
  margin-top: var(--space-md);
}

/* --- Hero --- */
.hero {
  padding-top: calc(var(--header-height) + var(--space-4xl));
  padding-bottom: var(--space-5xl);
  background-color: var(--color-warm-white);
  position: relative;
  overflow: hidden;
}

.hero__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
}

.hero__label {
  display: inline-block;
  font-size: var(--text-label);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ochre);
  margin-bottom: var(--space-lg);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-display);
  line-height: 1.1;
  color: var(--color-soil);
  margin-bottom: var(--space-xl);
}

.hero__subtitle {
  font-size: var(--text-body-lg);
  color: var(--color-clay);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
  max-width: 540px;
}

.hero__actions {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-3xl);
  flex-wrap: wrap;
}

.hero__metrics {
  display: flex;
  gap: var(--space-2xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--color-wheat);
}

.hero__metric { display: flex; flex-direction: column; }

.hero__metric-value {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  color: var(--color-ochre);
  line-height: 1;
}

.hero__metric-suffix {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  color: var(--color-ochre);
  line-height: 1;
}

.hero__metric-label {
  font-size: var(--text-caption);
  color: var(--color-clay);
  margin-top: var(--space-xs);
}

.hero__visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__illustration {
  position: relative;
  width: 100%;
  max-width: 420px;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__shape { position: absolute; border-radius: 50%; }

.hero__shape--1 {
  width: 100%;
  height: 100%;
  border: 1px solid var(--color-wheat);
  animation: pulse-slow 8s ease-in-out infinite;
}

.hero__shape--2 {
  width: 75%;
  height: 75%;
  border: 1px solid var(--color-ochre);
  opacity: 0.3;
  animation: pulse-slow 8s ease-in-out infinite 2s;
}

.hero__shape--3 {
  width: 50%;
  height: 50%;
  background: radial-gradient(circle, rgba(198, 123, 60, 0.06) 0%, transparent 70%);
  animation: pulse-slow 8s ease-in-out infinite 4s;
}

.hero__central { position: relative; z-index: 1; }

.hero__svg { width: 280px; height: 280px; }

.hero__curve {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  line-height: 0;
}

.hero__curve svg { width: 100%; height: 80px; }

@keyframes pulse-slow {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.03); opacity: 0.8; }
}

/* --- About --- */
.about__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.about__card {
  background-color: var(--color-warm-white);
  border: 1px solid var(--color-wheat);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition-base);
}

.about__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-ochre);
}

.about__card-icon { width: 56px; height: 56px; margin-bottom: var(--space-lg); }
.about__card-icon svg { width: 100%; height: 100%; }

.about__card-title {
  font-family: var(--font-body);
  font-size: var(--text-h3);
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--color-soil);
}

.about__card-text {
  font-size: var(--text-body);
  color: var(--color-clay);
  line-height: 1.7;
}

/* --- Features --- */
.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.feature-card {
  padding: var(--space-2xl) var(--space-xl);
  border-bottom: 2px solid var(--color-wheat);
  transition: border-color var(--transition-base);
}

.feature-card:hover { border-color: var(--color-ochre); }

.feature-card__number {
  font-family: var(--font-display);
  font-size: var(--text-body-lg);
  color: var(--color-ochre);
  margin-bottom: var(--space-lg);
  opacity: 0.6;
}

.feature-card__title {
  font-family: var(--font-body);
  font-size: var(--text-h3);
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--color-soil);
}

.feature-card__text {
  font-size: var(--text-body);
  color: var(--color-clay);
  line-height: 1.7;
}

/* --- How It Works --- */
.how__steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2xl);
}

.how__step {
  position: relative;
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
}

.how__step-number {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--color-ochre);
  color: var(--color-white);
  font-family: var(--font-display);
  font-size: var(--text-h3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-xl);
}

.how__step-title {
  font-family: var(--font-body);
  font-size: var(--text-h3);
  font-weight: 700;
  color: var(--color-warm-white);
  margin-bottom: var(--space-md);
}

.how__step-text {
  font-size: var(--text-body);
  color: rgba(250, 247, 242, 0.7);
  line-height: 1.7;
}

/* --- Impact --- */
.impact__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  margin-bottom: var(--space-4xl);
}

.impact__stat {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  background-color: var(--color-warm-white);
  border: 1px solid var(--color-wheat);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.impact__stat:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.impact__stat-value {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-h1);
  color: var(--color-ochre);
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.impact__stat-label {
  display: block;
  font-size: var(--text-body-sm);
  color: var(--color-clay);
  font-weight: 500;
}

.impact__values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
}

.impact__value {
  padding: var(--space-2xl);
  background-color: var(--color-warm-white);
  border-left: 3px solid var(--color-ochre);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.impact__value-title {
  font-family: var(--font-body);
  font-size: var(--text-h3);
  font-weight: 700;
  color: var(--color-soil);
  margin-bottom: var(--space-md);
}

.impact__value-text {
  font-size: var(--text-body);
  color: var(--color-clay);
  line-height: 1.7;
}

/* --- CTA --- */
.cta { background-color: var(--color-warm-white); }

.cta__content {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-4xl) var(--space-2xl);
  background-color: var(--color-soil);
  border-radius: var(--radius-xl);
}

.cta__title {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  color: var(--color-warm-white);
  margin-bottom: var(--space-lg);
}

.cta__text {
  font-size: var(--text-body-lg);
  color: rgba(250, 247, 242, 0.7);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
}

.cta__actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Contact --- */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: start;
}

.contact__text {
  font-size: var(--text-body-lg);
  color: var(--color-clay);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
}

.contact__details {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.contact__detail-label {
  display: block;
  font-size: var(--text-label);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-clay);
  margin-bottom: var(--space-xs);
}

.contact__detail-value {
  font-size: var(--text-body);
  font-weight: 500;
  color: var(--color-soil);
}

.contact__form {
  background-color: var(--color-warm-white);
  border: 1px solid var(--color-wheat);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
}

.form__group { margin-bottom: var(--space-lg); }

.form__label {
  display: block;
  font-size: var(--text-body-sm);
  font-weight: 500;
  color: var(--color-soil);
  margin-bottom: var(--space-sm);
}

.form__input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-wheat);
  border-radius: var(--radius-sm);
  background-color: var(--color-sand);
  color: var(--color-soil);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form__input::placeholder { color: var(--color-clay); }

.form__input:focus {
  outline: none;
  border-color: var(--color-ochre);
  box-shadow: 0 0 0 3px rgba(198, 123, 60, 0.15);
}

.form__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 d='M6 8L1 3h10z' fill='%238A7B6B'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
  cursor: pointer;
}

.form__textarea { resize: vertical; min-height: 100px; }

.form__success {
  margin-top: var(--space-lg);
  padding: var(--space-md);
  background-color: rgba(45, 80, 22, 0.1);
  border: 1px solid var(--color-forest);
  border-radius: var(--radius-sm);
  color: var(--color-forest);
  text-align: center;
  font-weight: 500;
}

/* --- Footer --- */
.footer {
  background-color: var(--color-soil);
  color: var(--color-warm-white);
  padding: var(--space-4xl) 0 var(--space-2xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-warm-white);
  margin-bottom: var(--space-lg);
}

.footer__logo .nav__logo-icon { color: var(--color-ochre); }

.footer__tagline {
  font-size: var(--text-body);
  color: rgba(250, 247, 242, 0.6);
  line-height: 1.7;
  max-width: 300px;
}

.footer__heading {
  font-family: var(--font-body);
  font-size: var(--text-body-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-warm-white);
  margin-bottom: var(--space-lg);
}

.footer__list { display: flex; flex-direction: column; gap: var(--space-md); }

.footer__link {
  font-size: var(--text-body-sm);
  color: rgba(250, 247, 242, 0.6);
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  padding-top: var(--space-2xl);
  border-top: 1px solid rgba(250, 247, 242, 0.1);
}

.footer__copy {
  font-size: var(--text-caption);
  color: rgba(250, 247, 242, 0.4);
}

/* --- Reveal Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero__shape--1, .hero__shape--2, .hero__shape--3 { animation: none; }
  .about__card:hover, .impact__stat:hover, .feature-card:hover { transform: none; }
}

/* --- Responsive: Tablet (max-width: 1024px) --- */
@media (max-width: 1024px) {
  :root {
    --text-display: 3rem;
    --text-h1: 2.5rem;
    --text-h2: 2rem;
  }

  .hero__container {
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
    text-align: center;
  }

  .hero__subtitle { margin-left: auto; margin-right: auto; }
  .hero__actions { justify-content: center; }
  .hero__metrics { justify-content: center; }
  .hero__visual { order: -1; }
  .hero__illustration { max-width: 300px; margin: 0 auto; }
  .hero__svg { width: 220px; height: 220px; }

  .about__grid { grid-template-columns: 1fr; gap: var(--space-xl); }
  .features__grid { grid-template-columns: repeat(2, 1fr); }
  .impact__grid { grid-template-columns: repeat(2, 1fr); }

  .footer__grid { grid-template-columns: 1fr 1fr; gap: var(--space-2xl); }
}

/* --- Responsive: Mobile (max-width: 768px) --- */
@media (max-width: 768px) {
  :root {
    --text-display: 2.25rem;
    --text-h1: 2rem;
    --text-h2: 1.75rem;
    --space-4xl: 4rem;
    --space-5xl: 5rem;
  }

  .nav__links, .nav__actions { display: none; }
  .nav__toggle { display: flex; }

  .hero {
    padding-top: calc(var(--header-height) + var(--space-2xl));
    padding-bottom: var(--space-4xl);
  }

  .hero__metrics {
    flex-direction: column;
    gap: var(--space-lg);
    align-items: center;
  }

  .hero__metric { align-items: center; }

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

  .feature-card {
    border-bottom: none;
    border-left: 2px solid var(--color-wheat);
    padding-left: var(--space-xl);
    padding-bottom: 0;
  }

  .how__steps { grid-template-columns: 1fr; gap: var(--space-xl); }
  .how__step { padding: var(--space-xl) 0; }

  .impact__grid { grid-template-columns: 1fr 1fr; gap: var(--space-md); }
  .impact__values { grid-template-columns: 1fr; }

  .contact__grid { grid-template-columns: 1fr; gap: var(--space-2xl); }

  .cta__content { padding: var(--space-2xl) var(--space-lg); }

  .cta__actions { flex-direction: column; align-items: center; }

  .footer__grid { grid-template-columns: 1fr; gap: var(--space-2xl); }
}

/* --- Responsive: Small Mobile (max-width: 480px) --- */
@media (max-width: 480px) {
  :root {
    --text-display: 1.875rem;
    --text-h1: 1.75rem;
    --text-h2: 1.5rem;
    --container-padding: 1.25rem;
  }

  .hero__actions { flex-direction: column; align-items: center; }
  .hero__actions .btn { width: 100%; }
  .impact__grid { grid-template-columns: 1fr; }
  .cta__actions .btn { width: 100%; }
}