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

:root {
  --black: #1d1d1f;
  --gray-1: #3d3d3f;
  --gray-2: #6e6e73;
  --gray-3: #a1a1a6;
  --gray-4: #d2d2d7;
  --gray-5: #e8e8ed;
  --gray-6: #f5f5f7;
  --white: #ffffff;
  --accent: #1d1d1f;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-xl: 28px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', sans-serif;
  background: var(--white);
  color: var(--black);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ─── NAV ─────────────────────────────────────────── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 999;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2.5rem;
  height: 52px;
  background: rgba(255,255,255,0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 0.5px solid rgba(0,0,0,0.08);
}
.nav-logo {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.4px;
  color: var(--black);
  text-decoration: none;
}
.nav-links {
  display: flex;
  gap: 2.2rem;
  list-style: none;
}
.nav-links a {
  font-size: 13px;
  font-weight: 400;
  color: var(--gray-1);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--black); }
.nav-cta {
  font-size: 13px;
  font-weight: 500;
  color: var(--white) !important;
  background: var(--black);
  padding: 7px 16px;
  border-radius: 980px;
  transition: opacity 0.2s !important;
}
.nav-cta:hover { opacity: 0.75 !important; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--black);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.hamburger.active span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile menu overlay */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 998;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  opacity: 0;
  transition: opacity 0.3s;
}
.mobile-menu.open { display: flex; opacity: 1; }
.mobile-menu a {
  font-size: 24px;
  font-weight: 500;
  color: var(--black);
  text-decoration: none;
  letter-spacing: -0.5px;
  transition: color 0.2s;
}
.mobile-menu a:hover { color: var(--gray-2); }

/* ─── HERO ────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8rem 2rem 5rem;
  background: var(--white);
}
.hero-eyebrow {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray-2);
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeUp 0.8s 0.1s forwards;
}
.hero h1 {
  font-size: clamp(42px, 7vw, 80px);
  font-weight: 600;
  letter-spacing: -2.5px;
  line-height: 1.05;
  color: var(--black);
  max-width: 820px;
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeUp 0.8s 0.2s forwards;
}
.hero h1 em {
  font-style: normal;
  color: var(--gray-2);
}
.hero-sub {
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 300;
  color: var(--gray-2);
  max-width: 560px;
  line-height: 1.55;
  margin-bottom: 2.5rem;
  opacity: 0;
  animation: fadeUp 0.8s 0.35s forwards;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.8s 0.5s forwards;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--black);
  color: var(--white);
  font-size: 15px;
  font-weight: 500;
  padding: 13px 26px;
  border-radius: 980px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: opacity 0.2s;
}
.btn-primary:hover { opacity: 0.78; }
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  color: var(--black);
  font-size: 15px;
  font-weight: 500;
  padding: 13px 26px;
  border-radius: 980px;
  border: 1px solid var(--gray-4);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}
.btn-secondary:hover { background: var(--gray-6); border-color: var(--gray-3); }

/* ─── SECTION COMMONS ─────────────────────────────── */
section { padding: 6rem 2rem; }
.container { max-width: 980px; margin: 0 auto; }
.section-label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray-3);
  margin-bottom: 1rem;
}
.section-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 600;
  letter-spacing: -1.5px;
  line-height: 1.08;
  color: var(--black);
  margin-bottom: 1rem;
}
.section-body {
  font-size: 17px;
  font-weight: 300;
  color: var(--gray-2);
  line-height: 1.65;
  max-width: 580px;
}
.divider {
  height: 0.5px;
  background: var(--gray-5);
  max-width: 980px;
  margin: 0 auto;
}

/* ─── ABOUT ───────────────────────────────────────── */
#about { background: var(--gray-6); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
  margin-top: 3rem;
}
.about-copy p + p { margin-top: 1rem; }
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}
.stat {
  padding: 1.5rem 1.5rem 1.5rem 0;
  border-top: 0.5px solid var(--gray-4);
}
.stat:nth-child(2) { padding-left: 1.5rem; border-left: 0.5px solid var(--gray-4); }
.stat:nth-child(4) { padding-left: 1.5rem; border-left: 0.5px solid var(--gray-4); }
.stat-num {
  font-size: 36px;
  font-weight: 600;
  letter-spacing: -1px;
  color: var(--black);
  line-height: 1;
}
.stat-label {
  font-size: 13px;
  color: var(--gray-2);
  margin-top: 6px;
  line-height: 1.4;
}

/* ─── EXPERIENCE ──────────────────────────────────── */
#experience { background: var(--white); }
.exp-list { margin-top: 3.5rem; }
.exp-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 3rem;
  padding: 2.5rem 0;
  border-top: 0.5px solid var(--gray-5);
}
.exp-item:last-child { border-bottom: 0.5px solid var(--gray-5); }
.exp-meta-period {
  font-size: 13px;
  color: var(--gray-3);
  margin-bottom: 4px;
}
.exp-meta-org {
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-2);
}
.exp-role {
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.3px;
  color: var(--black);
  margin-bottom: 0.75rem;
}
.exp-desc {
  font-size: 15px;
  font-weight: 300;
  color: var(--gray-2);
  line-height: 1.65;
  margin-bottom: 1.2rem;
}
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: 12px;
  font-weight: 400;
  color: var(--gray-2);
  background: var(--gray-6);
  border: 0.5px solid var(--gray-4);
  padding: 4px 11px;
  border-radius: 980px;
}

/* ─── EXPERTISE ───────────────────────────────────── */
#expertise { background: var(--gray-6); }
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--gray-4);
  border: 1px solid var(--gray-4);
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin-top: 3rem;
}
.expertise-card {
  background: var(--gray-6);
  padding: 2.2rem 2rem;
  transition: background 0.25s;
}
.expertise-card:hover { background: var(--white); }
.e-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 1.2rem;
  color: var(--gray-2);
}
.expertise-card h3 {
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -0.2px;
  color: var(--black);
  margin-bottom: 0.5rem;
}
.expertise-card p {
  font-size: 14px;
  font-weight: 300;
  color: var(--gray-2);
  line-height: 1.6;
}

/* ─── VENTURES ────────────────────────────────────── */
#ventures { background: var(--white); }
.ventures-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 3rem;
}
.venture-card {
  background: var(--gray-6);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  border: 0.5px solid var(--gray-5);
  transition: transform 0.3s, box-shadow 0.3s;
}
.venture-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.07);
}
.venture-type {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray-3);
  margin-bottom: 1.2rem;
}
.venture-card h3 {
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.8px;
  color: var(--black);
  margin-bottom: 0.6rem;
}
.venture-card p {
  font-size: 15px;
  font-weight: 300;
  color: var(--gray-2);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

/* ─── CONTACT ─────────────────────────────────────── */
#contact {
  background: var(--black);
  color: var(--white);
}
#contact .section-label { color: rgba(255,255,255,0.4); }
#contact .section-title { color: var(--white); }
#contact .section-body { color: rgba(255,255,255,0.55); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  margin-top: 3rem;
  align-items: start;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--white);
  background: rgba(255,255,255,0.08);
  border: 0.5px solid rgba(255,255,255,0.15);
  padding: 11px 22px;
  border-radius: 980px;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s;
  width: fit-content;
}
.contact-btn:hover {
  background: rgba(255,255,255,0.14);
  border-color: rgba(255,255,255,0.3);
}
.contact-btn svg { opacity: 0.7; }

/* Contact form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
}
.form-group input,
.form-group textarea {
  background: rgba(255,255,255,0.06);
  border: 0.5px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 300;
  color: var(--white);
  outline: none;
  transition: border-color 0.2s, background 0.2s;
  resize: vertical;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(255,255,255,0.25);
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: rgba(255,255,255,0.4);
  background: rgba(255,255,255,0.1);
}
.form-group textarea { min-height: 120px; }

.form-submit {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--white);
  color: var(--black);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  padding: 12px 26px;
  border-radius: 980px;
  border: none;
  cursor: pointer;
  width: fit-content;
  transition: opacity 0.2s;
}
.form-submit:hover { opacity: 0.8; }
.form-submit:disabled { opacity: 0.5; cursor: not-allowed; }

.form-status {
  font-size: 14px;
  font-weight: 400;
  min-height: 20px;
}
.form-status.success { color: #34c759; }
.form-status.error { color: #ff453a; }

/* ─── FOOTER ──────────────────────────────────────── */
footer {
  background: var(--black);
  border-top: 0.5px solid rgba(255,255,255,0.08);
  padding: 2rem 2.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
footer p {
  font-size: 12px;
  color: rgba(255,255,255,0.3);
}
footer nav { background: transparent; position: static; border: none; height: auto; padding: 0; backdrop-filter: none; -webkit-backdrop-filter: none; }
footer .nav-links a {
  font-size: 12px;
  color: rgba(255,255,255,0.3);
}
footer .nav-links a:hover { color: rgba(255,255,255,0.6); }

/* ─── SCROLL ANIMATIONS ──────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}
.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; }

/* ─── RESPONSIVE ──────────────────────────────────── */
@media (max-width: 768px) {
  nav { padding: 0 1.5rem; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .hero { padding: 7rem 1.5rem 4rem; }
  section { padding: 4rem 1.5rem; }
  .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .exp-item { grid-template-columns: 1fr; gap: 0.5rem; }
  .expertise-grid { grid-template-columns: 1fr; }
  .ventures-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .divider { margin: 0 1.5rem; }
  footer { flex-direction: column; gap: 1rem; text-align: center; }
}