/* ============================================================
   VC Design Lab — Main Stylesheet
   ============================================================ */

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

/* ── Custom Properties ─────────────────────────────────────── */
:root {
  --white: #FFFFFF;
  --off-white: #F8F7F4;
  --light-gray: #EDECE9;
  --border: #E2E1DD;
  --text-secondary: #4A4A4A;
  --text-primary: #111111;
  --dark: #0F0F0F;
  --accent: #2D5A45;

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --size-xs: 0.75rem;
  --size-sm: 0.875rem;
  --size-base: 1rem;
  --size-lg: 1.125rem;
  --size-xl: 1.25rem;
  --size-2xl: 1.5rem;
  --size-3xl: 2rem;
  --size-4xl: 2.75rem;
  --size-5xl: 3.75rem;
  --size-6xl: 5rem;

  --radius: 4px;
  --transition: 0.2s ease;

  --max-width: 1160px;
  --section-padding: 100px;
  --section-padding-mobile: 64px;
}

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

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

body {
  font-family: var(--font);
  font-size: var(--size-base);
  color: var(--text-primary);
  background: var(--white);
  line-height: 1.6;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: var(--font); cursor: pointer; border: none; background: none; }

/* ── Layout ─────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
}

.section { padding: var(--section-padding) 0; }
.section--dark { background: var(--dark); color: var(--white); }
.section--tint { background: var(--off-white); }

/* ── Typography ─────────────────────────────────────────────── */
.heading-2 {
  font-size: var(--size-4xl);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.heading-3 {
  font-size: var(--size-3xl);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.heading-4 {
  font-size: var(--size-2xl);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.eyebrow {
  font-size: var(--size-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.eyebrow--light { color: rgba(255,255,255,0.65); }

.body-lg { font-size: var(--size-lg); line-height: 1.65; color: var(--text-secondary); }

.text-balance { text-wrap: balance; }
.nowrap { white-space: nowrap; }

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--size-sm);
  font-weight: 500;
  letter-spacing: 0.01em;
  padding: 13px 24px;
  border-radius: var(--radius);
  transition: all var(--transition);
  white-space: nowrap;
}

.btn__icon { flex-shrink: 0; }
.btn--icon { padding: 4px; background: transparent; border-radius: 0; transition: opacity var(--transition); }
.btn--icon:hover { background: transparent; opacity: 0.7; }
.btn--icon .btn__icon { width: 28px; height: 28px; }
.nav__cta.btn--icon .btn__icon { width: 24px; height: 24px; }

.btn--primary { background: var(--text-primary); color: var(--white); }
.btn--primary:hover { background: #2a2a2a; }

.btn--primary-light { background: var(--white); color: var(--dark); }
.btn--primary-light:hover { background: var(--off-white); }

.btn--primary.btn--icon { color: var(--text-primary); background: transparent; }
.btn--primary-light.btn--icon { color: var(--white); background: transparent; }
.btn--primary.btn--icon:hover, .btn--primary-light.btn--icon:hover { background: transparent; }

.btn--ghost { color: var(--text-primary); border: 1.5px solid var(--border); }
.btn--ghost:hover { border-color: var(--text-primary); }

.btn--ghost-light { color: var(--white); border: 1.5px solid rgba(255,255,255,0.25); }
.btn--ghost-light:hover { border-color: rgba(255,255,255,0.7); }

.btn-group { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

/* ── Navigation ──────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.nav.scrolled { border-bottom-color: var(--border); }

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo img { height: 30px; width: auto; }

.nav__links { display: flex; align-items: center; gap: 32px; }

.nav__link {
  font-size: var(--size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.nav__link:hover, .nav__link.active { color: var(--text-primary); }

.nav__cta { margin-left: 8px; }
.nav__name {
  font-size: var(--size-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav__hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-primary);
  transition: all var(--transition);
}

.nav__mobile {
  display: none;
  flex-direction: column;
  padding: 16px 40px 28px;
  border-top: 1px solid var(--border);
  gap: 4px;
}

.nav__mobile-link {
  font-size: var(--size-lg);
  font-weight: 500;
  color: var(--text-primary);
  padding: 10px 0;
  display: block;
}

.nav__mobile .btn { margin-top: 16px; align-self: flex-start; }

/* ── Hero ────────────────────────────────────────────────────── */
.hero {
  background: var(--dark);
  color: var(--white);
  padding-top: calc(64px + 100px);
  padding-bottom: 100px;
}

.hero__content { max-width: 800px; }

.hero__eyebrow { margin-bottom: 28px; }

.hero__headline {
  font-size: clamp(2.75rem, 6vw, var(--size-6xl));
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  color: var(--white);
}

.hero__sub {
  font-size: var(--size-xl);
  color: rgba(255,255,255,0.68);
  line-height: 1.55;
  max-width: 520px;
  margin-bottom: 44px;
  font-weight: 400;
}

.hero__sub:last-child { margin-bottom: 0; }

/* ── Proof / Logos ───────────────────────────────────────────── */
.proof {
  padding: 72px 0;
  background: #FFFFFF;
  border-bottom: 1px solid var(--border);
}

.proof__label {
  font-size: var(--size-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 36px;
}

.proof__logos {
  display: flex;
  align-items: center;
  gap: 48px;
  flex-wrap: wrap;
}

.proof__logo img {
  height: 22px;
  width: auto;
  opacity: 0.4;
  filter: grayscale(1);
  transition: opacity var(--transition);
}
.proof__logo img:hover { opacity: 0.65; }

.proof__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-top: 64px;
}

.proof__stat-number {
  font-size: var(--size-4xl);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1;
  margin-bottom: 10px;
}

.proof__stat-label {
  font-size: var(--size-sm);
  color: var(--text-secondary);
  line-height: 1.45;
}

/* ── Services ────────────────────────────────────────────────── */
.services__header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 56px;
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.service-card {
  background: #FFFFFF;
  padding: 44px 36px;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.service-card__number {
  font-size: var(--size-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

.service-card__title {
  font-size: var(--size-2xl);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

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

.service-card__tagline {
  font-size: var(--size-sm);
  color: var(--text-secondary);
  font-style: italic;
  margin-top: auto;
  padding-top: 20px;
}

/* ── AI Section ──────────────────────────────────────────────── */
.ai-section { padding: var(--section-padding) 0; }

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

.ai-section__headline {
  font-size: var(--size-5xl);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--white);
  margin: 28px 0;
}

.ai-section__body {
  color: rgba(255,255,255,0.68);
  font-size: var(--size-lg);
  line-height: 1.6;
  margin-bottom: 28px;
}

.ai-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 40px;
}

.ai-list__item {
  display: flex;
  align-items: center;
  gap: 12px;
  color: rgba(255,255,255,0.82);
  font-size: var(--size-base);
}

.ai-list__item::before {
  content: '';
  display: block;
  width: 18px;
  height: 1.5px;
  background: rgba(255,255,255,0.25);
  flex-shrink: 0;
}

.ai-callout {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 28px;
  margin-top: 36px;
}

.ai-callout p {
  font-size: var(--size-lg);
  line-height: 1.55;
  color: rgba(255,255,255,0.8);
}

.ai-callout strong { color: var(--white); font-weight: 600; }

.ai-section__visual {
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  padding: 40px;
  position: sticky;
  top: 84px;
}

.ai-visual-label {
  font-size: var(--size-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: 28px;
}

.ai-visual-item {
  padding: 18px 0;
  border-bottom: 1px solid rgba(255,255,255,0.07);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.ai-visual-item:last-child { border-bottom: none; }

.ai-visual-item__label { font-size: var(--size-sm); color: rgba(255,255,255,0.65); }
.ai-visual-item__value { font-size: var(--size-sm); font-weight: 500; color: var(--white); }

/* ── Products (homepage cards) ───────────────────────────────── */
.products__header { max-width: 560px; margin-bottom: 56px; }

.products__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 48px;
}

.product-card {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.product-card:hover {
  border-color: #C0BFB9;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.product-card__tag {
  display: inline-flex;
  align-items: center;
  font-size: var(--size-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 20px;
  align-self: flex-start;
}

.product-card__name {
  font-size: var(--size-2xl);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.product-card__desc {
  font-size: var(--size-base);
  color: var(--text-secondary);
  line-height: 1.6;
}

.product-card__features {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}

.product-card__feature {
  font-size: var(--size-sm);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.product-card__feature::before { content: '\2192'; font-size: 0.75em; }

.products__footnote {
  font-size: var(--size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 480px;
  margin-top: 48px;
}

.products__context {
  margin-top: 56px;
  max-width: 640px;
}

.products__context-title {
  font-size: var(--size-xl);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.products__context-body {
  font-size: var(--size-base);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ── How We Work ─────────────────────────────────────────────── */
.how__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.how__left { position: sticky; top: 84px; }

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

.how__item {
  padding: 24px 0;
  display: flex;
  gap: 24px;
  border-bottom: 1px solid var(--border);
}

.how__item:first-child { border-top: 1px solid var(--border); }

.how__item-num {
  font-size: var(--size-xs);
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 28px;
  padding-top: 3px;
  letter-spacing: 0.05em;
}

.how__item-text {
  font-size: var(--size-lg);
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1.5;
}

/* ── Testimonials ────────────────────────────────────────────── */
.testimonials__header { margin-bottom: 48px; }

.testimonials__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.testimonial-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.testimonial-card__quote {
  font-size: var(--size-base);
  line-height: 1.65;
  color: var(--text-primary);
  flex: 1;
}

.testimonial-card__quote::before {
  content: '\201C';
  font-size: 2em;
  line-height: 1;
  color: var(--border);
  display: block;
  margin-bottom: 8px;
  font-family: Georgia, serif;
}

.testimonial-card__author {}

.testimonial-card__name {
  font-size: var(--size-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.testimonial-card__title {
  font-size: var(--size-xs);
  color: var(--text-secondary);
  margin-top: 3px;
  line-height: 1.4;
}

/* ── Final CTA ───────────────────────────────────────────────── */
.cta-section {
  text-align: center;
  padding: 120px 0;
}

.cta-section__headline {
  font-size: clamp(2.25rem, 5vw, var(--size-5xl));
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--white);
  margin: 20px auto 40px;
  max-width: 780px;
  text-wrap: balance;
}

/* ── Page Hero (inner pages) ─────────────────────────────────── */
.page-hero {
  background: var(--dark);
  color: var(--white);
  padding-top: calc(64px + 72px);
  padding-bottom: 72px;
}

.page-hero__eyebrow { margin-bottom: 20px; }

.page-hero__title {
  font-size: clamp(2.25rem, 5vw, var(--size-5xl));
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
  max-width: 640px;
  text-wrap: balance;
}

.page-hero__sub {
  font-size: var(--size-lg);
  color: rgba(255,255,255,0.65);
  line-height: 1.5;
  max-width: 480px;
}

/* ── Approach ────────────────────────────────────────────────── */
.approach__principles { display: flex; flex-direction: column; }

.principle {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 80px;
  padding: 56px 0;
  align-items: start;
}

.principle:first-child { padding-top: 0; }

.principle__number {
  font-size: var(--size-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  padding-top: 6px;
}

.principle__title {
  font-size: var(--size-3xl);
  font-weight: 600;
  letter-spacing: -0.015em;
  margin-bottom: 14px;
}

.principle__text {
  font-size: var(--size-lg);
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 560px;
}

/* ── About ───────────────────────────────────────────────────── */
.about__inner {
  display: grid;
  grid-template-columns: 1fr 440px;
  gap: 100px;
  align-items: start;
}

.about__bio-title {
  font-size: var(--size-4xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 28px;
}

.about__bio-text {
  font-size: var(--size-lg);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.about__companies {
  display: flex;
  flex-direction: column;
  margin-top: 48px;
  border-top: 1px solid var(--border);
}

.about__company {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
}

.about__company-name { font-size: var(--size-base); font-weight: 500; }
.about__company-role { font-size: var(--size-sm); color: var(--text-secondary); }

.about__open { margin-top: 64px; }

.about__open-item {
  padding: 20px 0;
  border-top: 1px solid var(--border);
}

.about__open-role {
  font-size: var(--size-lg);
  font-weight: 600;
  margin-bottom: 6px;
}

.about__open-text {
  font-size: var(--size-base);
  color: var(--text-secondary);
  line-height: 1.6;
}

.about__photo { position: sticky; top: 84px; width: 50%; }

.about__photo img {
  width: 100%;
  border-radius: 8px;
  aspect-ratio: 1;
  object-fit: cover;
}

.about__photo-caption {
  font-size: var(--size-sm);
  color: var(--text-secondary);
  margin-top: 14px;
  line-height: 1.5;
}

/* ── Contact ─────────────────────────────────────────────────── */
.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 100px;
  align-items: start;
}

.contact__intro {
  font-size: var(--size-xl);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 44px;
  max-width: 400px;
}

.contact__detail { display: flex; flex-direction: column; gap: 28px; }

.contact__detail-label {
  font-size: var(--size-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.contact__detail-value { font-size: var(--size-base); font-weight: 500; }

.contact__detail-value a { opacity: 0.8; transition: opacity var(--transition); }
.contact__detail-value a:hover { opacity: 1; }

.contact__form { display: flex; flex-direction: column; gap: 18px; }

.form-group { display: flex; flex-direction: column; gap: 6px; }

.form-group label { font-size: var(--size-sm); font-weight: 500; }

.form-group input,
.form-group select,
.form-group textarea {
  font-family: var(--font);
  font-size: var(--size-base);
  color: var(--text-primary);
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 13px 14px;
  width: 100%;
  transition: border-color var(--transition);
  outline: none;
}

.form-group textarea { min-height: 130px; resize: vertical; }

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

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

/* ── Footer ──────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 44px 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer__logo img { height: 26px; width: auto; opacity: 0.55; }

.footer__links { display: flex; align-items: center; gap: 28px; }

.footer__link {
  font-size: var(--size-sm);
  color: var(--text-secondary);
  transition: color var(--transition);
}
.footer__link:hover { color: var(--text-primary); }

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

/* ── Utility ─────────────────────────────────────────────────── */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); border: 0;
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 1024px) {
  :root {
    --section-padding: 80px;
    --size-6xl: 4rem;
    --size-5xl: 3rem;
  }

  .container { padding: 0 32px; }

  .ai-section__inner { grid-template-columns: 1fr; gap: 56px; }
  .ai-section__visual { position: static; }

  .about__inner { grid-template-columns: 1fr; gap: 56px; }
  .about__photo { position: static; max-width: 340px; }

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

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

@media (max-width: 768px) {
  :root {
    --section-padding: var(--section-padding-mobile);
    --size-6xl: 2.75rem;
    --size-5xl: 2.25rem;
    --size-4xl: 1.875rem;
    --size-3xl: 1.5rem;
  }

  .container { padding: 0 20px; }

  .nav__links, .nav__cta { display: none; }
  .nav__hamburger { display: flex; }
  .nav__mobile.open { display: flex; }

  .services__header { flex-direction: column; align-items: flex-start; }
  .services__grid { grid-template-columns: 1fr; }
  .services__header .btn { display: none; }

  .how__inner { grid-template-columns: 1fr; gap: 40px; }
  .how__left { position: static; }

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

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

  .proof__stats { grid-template-columns: repeat(2, 1fr); gap: 28px; }

  .contact__inner { grid-template-columns: 1fr; gap: 56px; }

  .principle { grid-template-columns: 1fr; gap: 12px; }

  .footer__inner { flex-direction: column; align-items: flex-start; gap: 16px; }
  .footer__links { flex-wrap: wrap; gap: 16px; }

  .proof__logos { gap: 28px; }
  .proof__logo img { height: 18px; }

  .btn-group { flex-direction: column; align-items: flex-start; }
}