/* ==========================================================================
   Organic Interactions - Global Stylesheet
   Consistent typography, spacing, colors and layout system
   ========================================================================== */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --color-bg: #FAFAF8;
  --color-bg-alt: #F4F4F0;
  --color-surface: #FFFFFF;
  --color-text: #1A1A1A;
  --color-text-secondary: #5A5A5A;
  --color-text-muted: #8A8A8A;
  --color-accent: #4A9E3F;        /* From logo leaf green */
  --color-accent-light: rgba(68, 157, 62, 0.3);   /* #449d3e at 30% opacity */
  --color-accent-dark: #2E7D27;    /* Darker stem green */
  --color-warm: #D4A017;           /* Sunflower gold accent */
  --color-border: #E8E8E4;
  --color-border-light: #F0F0EC;

  /* Typography */
  --font-family: 'Helvetica Neue', 'Helvetica', Arial, sans-serif;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* Font Sizes - fluid scale (bumped for readability) */
  --text-xs: clamp(0.8rem, 0.75rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.83rem + 0.2vw, 0.9375rem);
  --text-base: clamp(1.0625rem, 1rem + 0.3vw, 1.1875rem);
  --text-lg: clamp(1.1875rem, 1.08rem + 0.5vw, 1.375rem);
  --text-xl: clamp(1.375rem, 1.2rem + 0.75vw, 1.625rem);
  --text-2xl: clamp(1.625rem, 1.3rem + 1.5vw, 2.125rem);
  --text-3xl: clamp(2.125rem, 1.6rem + 2.5vw, 2.875rem);
  --text-4xl: clamp(2.625rem, 1.9rem + 3.5vw, 3.875rem);

  /* Line Heights */
  --leading-tight: 1.15;
  --leading-snug: 1.3;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  /* Spacing Scale */
  --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;

  /* Consistent heading-to-body gaps */
  --gap-h1-to-h2: 1rem;
  --gap-h2-to-body: 0.75rem;
  --gap-h1-to-body: 1.25rem;
  --gap-section: clamp(4rem, 3rem + 5vw, 8rem);

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --container-padding: clamp(1.25rem, 1rem + 2vw, 3rem);

  /* Borders & Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 16px 50px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-light);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent);
}

ul, ol {
  list-style: none;
}

button, input, textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--text-4xl);
  font-weight: var(--font-weight-extrabold);
  letter-spacing: -0.03em;
}

h2 {
  font-size: var(--text-3xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
  margin-top: var(--gap-h1-to-h2);
}

h3 {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.01em;
}

h4 {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
}

h5 {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-bold);
}

/* Consistent gap: heading to following paragraph */
h1 + p, h1 + .subtitle { margin-top: var(--gap-h1-to-body); }
h2 + p { margin-top: var(--gap-h2-to-body); }
h3 + p { margin-top: 0.5rem; }
h4 + p { margin-top: 0.5rem; }

p {
  font-weight: var(--font-weight-light);
  line-height: var(--leading-normal);
  color: var(--color-text-secondary);
}

p + p {
  margin-top: var(--space-md);
}

.text-muted {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.text-accent {
  color: var(--color-accent);
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.container--narrow {
  max-width: var(--container-narrow);
}

section {
  padding: var(--gap-section) 0;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.75rem;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--color-text);
  color: var(--color-surface);
}

.btn--primary:hover {
  background-color: var(--color-accent-dark);
  color: var(--color-surface);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-text);
}

.btn--outline:hover {
  background-color: var(--color-text);
  color: var(--color-surface);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  padding: 0.5rem 0;
  text-transform: none;
  font-weight: var(--font-weight-regular);
  letter-spacing: 0;
  position: relative;
}

.btn--ghost::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-text);
  transition: width var(--transition-base);
}

.btn--ghost:hover::after {
  width: 100%;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

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

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

.nav__logo-text {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-extrabold);
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 1rem + 1.5vw, 2.5rem);
}

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

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-text);
  transition: width var(--transition-base);
}

.nav__link:hover {
  color: var(--color-text);
}

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

.nav__link--active {
  color: var(--color-text);
  font-weight: var(--font-weight-bold);
}

/* Language toggle */
.nav__lang {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-regular);
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav__lang:hover {
  color: var(--color-text);
  border-color: var(--color-text);
}

/* Mobile hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  z-index: 1001;
}

.nav__hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-text);
  transition: all var(--transition-base);
}

.nav__hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(4.5px, 4.5px);
}

.nav__hamburger.active span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(4.5px, -4.5px);
}

/* Mobile menu overlay */
.nav__mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xl);
}

.nav__mobile-menu.active {
  display: flex;
}

.nav__mobile-menu a {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-light);
}

/* --- Scroll Reveal Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

.reveal--delay-1 { transition-delay: 0.1s; }
.reveal--delay-2 { transition-delay: 0.2s; }
.reveal--delay-3 { transition-delay: 0.3s; }
.reveal--delay-4 { transition-delay: 0.4s; }

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
}

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

.hero__tagline {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-light);
  color: var(--color-text-secondary);
  max-width: 480px;
}

.hero__cta {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-2xl);
}

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

.hero__visual img {
  max-width: 360px;
  width: 100%;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.08));
}

/* --- Clients / Logo Section --- */
.clients {
  background: var(--color-bg-alt);
  padding: var(--space-4xl) 0;
}

.clients__title {
  text-align: center;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-regular);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2xl);
}

.clients__grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(2rem, 3vw + 1rem, 5rem);
  flex-wrap: wrap;
}

.client-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 70px;
  cursor: pointer;
  transition: all var(--transition-base);
  opacity: 0.65;
}

.client-logo:hover {
  opacity: 1;
  transform: scale(1.08);
}

.client-logo img,
.client-logo svg {
  max-height: 60px;
  max-width: 180px;
  width: auto;
  height: auto;
  object-fit: contain;
}

/* --- Services Section --- */
.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-2xl);
  margin-top: var(--space-2xl);
}

.service-card {
  padding: var(--space-2xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.service-card:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.service-card__icon {
  font-size: 2rem;
  margin-bottom: var(--space-lg);
}

.service-card h4 {
  margin-bottom: var(--space-sm);
}

.service-card p {
  font-size: var(--text-sm);
}

/* --- About Section --- */
.about__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
}

.about__text p {
  margin-top: var(--space-md);
}

/* --- Contact Section --- */
.contact {
  background: var(--color-bg-alt);
}

.contact__inner {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.contact__form {
  margin-top: var(--space-2xl);
  text-align: left;
}

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

.form-group label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-regular);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-base);
  font-weight: var(--font-weight-light);
  color: var(--color-text);
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-text);
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
}

.contact__form .btn {
  width: 100%;
}

.form-success {
  display: none;
  text-align: center;
  padding: var(--space-2xl);
}

.form-success.active {
  display: block;
}

/* --- Footer --- */
.footer {
  padding: var(--space-3xl) 0 var(--space-xl);
  border-top: 1px solid var(--color-border-light);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  text-align: center;
}

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

.footer__logo img {
  height: 28px;
  width: auto;
  object-fit: contain;
}

.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* --- Case Study Page --- */
.case-hero {
  padding-top: calc(72px + var(--space-4xl));
  padding-bottom: var(--space-3xl);
}

.case-hero__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-regular);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2xl);
  transition: color var(--transition-fast);
}

.case-hero__back:hover {
  color: var(--color-text);
}

.case-hero__meta {
  display: flex;
  gap: var(--space-lg);
  margin-top: var(--space-lg);
  flex-wrap: wrap;
}

.case-hero__tag {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-regular);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.375rem 0.875rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
}

.case-hero__mockup {
  margin-top: var(--space-2xl);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.case-hero__mockup img {
  width: 100%;
  height: auto;
  display: block;
}

.case-body {
  padding-bottom: var(--gap-section);
}

.case-body__content {
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.case-body__content h3 {
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-md);
}

.case-body__content p {
  margin-top: var(--space-md);
}

.case-body__content ul {
  margin-top: var(--space-md);
  padding-left: var(--space-lg);
}

.case-body__content li {
  position: relative;
  padding-left: var(--space-md);
  margin-bottom: var(--space-sm);
  font-weight: var(--font-weight-light);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
}

.case-body__content li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-accent);
}

.case-cta {
  text-align: center;
  padding: var(--space-4xl) 0;
  background: var(--color-bg-alt);
}

/* --- CTA Banner --- */
.cta-banner {
  background: var(--color-accent-light);
  color: var(--color-surface);
  padding: var(--space-4xl) 0;
}

.cta-banner h2 {
  color: var(--color-surface);
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.85);
}

.cta-banner .btn--primary {
  background: var(--color-surface);
  color: var(--color-accent-light);
}

.cta-banner .btn--primary:hover {
  background: var(--color-warm);
  color: var(--color-text);
}

/* --- FAQ Section --- */
.faq__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.faq__item {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq__item:hover {
  border-color: var(--color-border);
}

.faq__item[open] {
  border-color: var(--color-accent);
}

.faq__item summary {
  padding: var(--space-lg) var(--space-xl);
  font-weight: var(--font-weight-bold);
  font-size: var(--text-base);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  color: var(--color-text);
}

.faq__item summary::-webkit-details-marker {
  display: none;
}

.faq__item summary::after {
  content: '+';
  font-size: var(--text-xl);
  font-weight: var(--font-weight-light);
  color: var(--color-accent);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq__item[open] summary::after {
  content: '-';
}

.faq__item p {
  padding: 0 var(--space-xl) var(--space-lg);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

/* --- Blog Grid --- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-2xl);
}

.blog-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-2xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  text-decoration: none;
}

.blog-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: inherit;
}

.blog-card__tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: var(--font-weight-regular);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.625rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  color: var(--color-accent-dark);
  margin-bottom: var(--space-md);
  width: fit-content;
}

.blog-card h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-sm);
}

.blog-card p {
  font-size: var(--text-sm);
  flex-grow: 1;
}

.blog-card__read {
  display: inline-block;
  margin-top: var(--space-md);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent);
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .hero__content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-2xl);
  }

  .hero__tagline {
    margin: 0 auto;
  }

  .hero__cta {
    justify-content: center;
  }

  .hero__visual {
    order: -1;
  }

  .hero__visual img {
    max-width: 240px;
  }

  .about__content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .nav__links {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .clients__grid {
    gap: var(--space-xl);
  }

  .client-logo img,
  .client-logo svg {
    max-height: 40px;
    max-width: 120px;
  }

  .footer__inner {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
}

@media (max-width: 600px) {
  .services__grid {
    grid-template-columns: 1fr;
  }

  .case-hero__meta {
    gap: var(--space-sm);
  }
}