/* ============================================
   Green Analytics — Portfolio
   Dark theme, minimal, modern
   ============================================ */

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

:root {
  --bg: #0a0a0b;
  --bg-elevated: #111113;
  --bg-card: #161618;
  --bg-card-hover: #1c1c1f;
  --border: #222225;
  --border-light: #2a2a2e;
  --text: #e8e8ed;
  --text-secondary: #8b8b97;
  --text-muted: #5c5c66;
  --accent: #6ee7b7;
  --accent-dim: rgba(110, 231, 183, 0.1);
  --accent-glow: rgba(110, 231, 183, 0.15);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --container: 1140px;
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

a:hover {
  color: #a7f3d0;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 120px 0;
}

/* --- Section Headers --- */
.section__header {
  margin-bottom: 64px;
}

.section__number {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent);
  display: block;
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}

.section__title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 20px 0;
  transition: all var(--transition);
}

.nav--scrolled {
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}

.nav__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 600;
}

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

.nav__logo-mark {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent);
  font-weight: 600;
}

.nav__logo-text {
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav__links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 400;
  transition: color var(--transition);
}

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

.nav__cta {
  background: var(--accent-dim);
  color: var(--accent) !important;
  padding: 8px 20px;
  border-radius: 6px;
  font-weight: 500;
  border: 1px solid rgba(110, 231, 183, 0.2);
}

.nav__cta:hover {
  background: rgba(110, 231, 183, 0.15);
}

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

.nav__toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: all var(--transition);
  border-radius: 2px;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(110, 231, 183, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(110, 231, 183, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black, transparent);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black, transparent);
}

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

.hero__photo {
  margin-bottom: 28px;
}

.hero__photo img {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border-light);
  box-shadow: 0 0 40px var(--accent-glow);
}

.hero__label {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent);
  margin-bottom: 24px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero__title {
  font-size: clamp(3.5rem, 10vw, 7rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.03em;
  margin-bottom: 28px;
}

.hero__title-accent {
  background: linear-gradient(135deg, var(--accent), #34d399, #a7f3d0);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__tagline {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  max-width: 540px;
  line-height: 1.6;
  margin-bottom: 40px;
}

.hero__actions {
  display: flex;
  gap: 16px;
  margin-bottom: 72px;
}

.hero__stats {
  display: flex;
  gap: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

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

.hero__stat-number {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1;
}

.hero__stat-suffix {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 600;
  color: var(--accent);
}

.hero__stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 6px;
}

.hero__scroll-indicator {
  position: absolute;
  bottom: 40px;
  right: 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.hero__scroll-indicator span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  writing-mode: vertical-rl;
}

.hero__scroll-line {
  width: 1px;
  height: 60px;
  background: var(--border);
  position: relative;
  overflow: hidden;
}

.hero__scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 40%;
  background: var(--accent);
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0% { top: -40%; }
  100% { top: 120%; }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 0.9rem;
  font-weight: 500;
  font-family: var(--font-sans);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-decoration: none;
}

.btn--primary {
  background: var(--accent);
  color: #0a0a0b;
}

.btn--primary:hover {
  background: #a7f3d0;
  color: #0a0a0b;
  transform: translateY(-1px);
  box-shadow: 0 8px 30px rgba(110, 231, 183, 0.2);
}

.btn--outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-light);
}

.btn--outline:hover {
  border-color: var(--text-muted);
  color: var(--text);
  transform: translateY(-1px);
}

.btn--large {
  padding: 18px 40px;
  font-size: 1rem;
}

.btn--full {
  width: 100%;
}

/* --- About --- */
.about__grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 80px;
  align-items: start;
}

.about__lead {
  font-size: 1.2rem;
  line-height: 1.7;
  margin-bottom: 20px;
  color: var(--text);
}

.about__text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
}

.about__text strong {
  color: var(--text);
  font-weight: 500;
}

.about__tech-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}

.about__tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 8px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.tech-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

/* --- Clients --- */
.clients {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 80px 0;
}

.clients__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.client-logo {
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  transition: background var(--transition);
}

.client-logo:hover {
  background: var(--bg-elevated);
}

.client-logo__text {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  text-align: center;
  letter-spacing: 0.02em;
  transition: color var(--transition);
}

.client-logo:hover .client-logo__text {
  color: var(--text-secondary);
}

/* --- Services --- */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.service-card {
  background: var(--bg);
  padding: 48px 36px;
  transition: all var(--transition);
  position: relative;
}

.service-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 36px;
  right: 36px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.service-card:hover {
  background: var(--bg-elevated);
}

.service-card:hover::after {
  opacity: 0.5;
}

.service-card__icon {
  color: var(--accent);
  margin-bottom: 24px;
}

.service-card__title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.service-card__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Case Studies --- */
.work__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.case-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-light);
  transform: translateY(-4px);
}

.case-card__tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 4px 12px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 20px;
  width: fit-content;
}

.case-card__title {
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.case-card__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
  flex-grow: 1;
}

.case-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.case-card__tech span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid rgba(110, 231, 183, 0.2);
}

.case-card__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
}

.case-card__link:hover {
  color: #a7f3d0;
}

/* --- Insights --- */
.insights__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  max-width: 800px;
}

.insight-card {
  padding: 36px 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}

.insight-card:hover {
  border-color: var(--border-light);
  background: var(--bg-card);
}

.insight-card__date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.insight-card__tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 4px 12px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 20px;
  width: fit-content;
}

.insight-card__title {
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 24px;
}

.insight-card__body p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.insight-card__body p:last-child {
  margin-bottom: 24px;
}

.insight-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.insight-card__tech span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid rgba(110, 231, 183, 0.2);
}

.insight-card__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Contact --- */
.contact {
  border-top: 1px solid var(--border);
}

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.contact__lead {
  font-size: 1.2rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
}

.contact__cta {
  margin-bottom: 48px;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact__info-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 4px;
}

.contact__info-item a,
.contact__info-item span {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 8px;
}

.form-input {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  transition: all var(--transition);
  outline: none;
}

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

.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

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

.contact__form .btn--primary {
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid rgba(110, 231, 183, 0.2);
}

.contact__form .btn--primary:hover {
  background: rgba(110, 231, 183, 0.15);
  color: #a7f3d0;
  box-shadow: 0 8px 30px rgba(110, 231, 183, 0.1);
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 20px;
}

.footer__brand p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer__links {
  display: flex;
  gap: 24px;
}

.footer__links a {
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* --- Mobile Responsive --- */
@media (max-width: 1024px) {
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

}

@media (max-width: 768px) {
  .section {
    padding: 80px 0;
  }

  .section__header {
    margin-bottom: 40px;
  }

  .nav__toggle {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-elevated);
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 32px 32px;
    gap: 24px;
    border-left: 1px solid var(--border);
    transition: right var(--transition);
  }

  .nav__links--open {
    right: 0;
  }

  .nav__toggle--active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

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

  .nav__toggle--active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero__title {
    font-size: clamp(2.8rem, 12vw, 4.5rem);
  }

  .hero__stats {
    flex-direction: column;
    gap: 24px;
  }

  .hero__scroll-indicator {
    display: none;
  }

  .hero__actions {
    flex-direction: column;
  }

  .hero__actions .btn {
    text-align: center;
  }

  .about__grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

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

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

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

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

  .contact__grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .footer__inner {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }

  .footer__brand {
    flex-direction: column;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero {
    padding: 100px 0 60px;
  }

  .hero__title {
    font-size: 2.5rem;
  }

  .service-card {
    padding: 32px 24px;
  }

  .case-card {
    padding: 28px 24px;
  }
}