/* ---------- Design Tokens ---------- */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f6f7f9;
  --color-text: #12131a;
  --color-text-muted: #5b5e6b;
  --color-border: #e7e8ec;
  --color-accent: #3b5bfd;
  --color-accent-dark: #2c46d1;
  --color-accent-soft: #eef1ff;

  --font-heading: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;

  --max-width: 1140px;
  --radius: 14px;
  --radius-sm: 8px;

  --transition: 0.25s ease;
}

/* ---------- Reset ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration: none; }

ul { list-style: none; }

button { font-family: inherit; cursor: pointer; border: none; background: none; }

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

.section { padding: 120px 0; }

.eyebrow {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 14px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-sub {
  color: var(--color-text-muted);
  max-width: 560px;
  font-size: 1.05rem;
}

.center { text-align: center; margin-left: auto; margin-right: auto; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover { background: var(--color-accent-dark); transform: translateY(-2px); }

.btn-ghost {
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
}
.btn-ghost:hover { border-color: var(--color-accent); color: var(--color-accent); transform: translateY(-2px); }

.btn-small { padding: 10px 20px; font-size: 0.85rem; }

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: 0 4px 20px rgba(0,0,0,0.04);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
}
.logo .dot { color: var(--color-accent); }

.nav {
  display: flex;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  transition: color var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--color-text); }
.nav-link.active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
}

.header-cta { display: inline-flex; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
}
.nav-toggle span {
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 76px;
  background:
    radial-gradient(circle at 15% 20%, var(--color-accent-soft) 0%, transparent 45%),
    radial-gradient(circle at 85% 80%, var(--color-accent-soft) 0%, transparent 45%);
}

.hero-inner {
  max-width: 760px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin-bottom: 24px;
}
.hero-title .accent { color: var(--color-accent); }

.hero-sub {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 540px;
  margin-bottom: 36px;
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.skill-tag {
  padding: 8px 16px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
}

/* ---------- Projects ---------- */
.projects { background: var(--color-bg-alt); }

.project-grid {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.project-card {
  background: var(--color-bg);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(18, 19, 26, 0.08);
}

.project-thumb {
  aspect-ratio: 16/10;
  background: linear-gradient(135deg, var(--color-accent-soft), #dfe4ff);
  overflow: hidden;
}

.project-thumb video,
.project-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.thumb-1 video { object-position: left center; }

.thumb-contain {
  background-color: var(--color-bg-alt);
}
.thumb-contain img {
  object-fit: contain;
}

.thumb-1 { background: linear-gradient(135deg, #ffe3ec, #ffd1e0); }
.thumb-2 { background: linear-gradient(135deg, #e3fff0, #c9ffe4); }
.thumb-3 { background: linear-gradient(135deg, #fff6e0, #ffe9b8); }
.thumb-4 { background: linear-gradient(135deg, #e3f0ff, #cfe4ff); }

.project-body { padding: 28px; }

.project-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.project-body h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.project-body p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.project-link {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text);
  transition: color var(--transition);
}
.project-link:hover { color: var(--color-accent); }

/* ---------- Ventures ---------- */
.venture-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: center;
  background: var(--color-text);
  color: #fff;
  border-radius: 24px;
  padding: 64px;
}

.venture-logo {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 2.2rem;
}

.venture-logo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.venture-card .eyebrow { color: #8aa0ff; }
.venture-card .section-title { color: #fff; }

.venture-text {
  color: rgba(255,255,255,0.72);
  max-width: 560px;
  margin-bottom: 24px;
}

.venture-tags { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; }
.venture-tags .skill-tag {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.16);
  color: #fff;
}

.venture-card .btn-ghost {
  border-color: rgba(255,255,255,0.3);
  color: #fff;
}
.venture-card .btn-ghost:hover { border-color: #fff; color: #fff; }

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 720px;
  margin: 56px auto 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  text-align: left;
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text);
}

.faq-icon {
  flex-shrink: 0;
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform var(--transition);
}

.faq-item.open .faq-icon { transform: rotate(45deg); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding var(--transition);
  padding: 0 24px;
}

.faq-answer p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  padding-bottom: 20px;
}

.faq-item.open .faq-answer {
  max-height: 300px;
}

/* ---------- Contact ---------- */
.contact-grid {
  margin-top: 56px;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 56px;
}

.form-row { margin-bottom: 20px; }

.form-row label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.form-row input,
.form-row textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--transition);
  resize: vertical;
}
.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

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

.info-item { display: flex; flex-direction: column; gap: 6px; }

.info-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.info-item a { font-weight: 500; transition: color var(--transition); }
.info-item a:hover { color: var(--color-accent); }

.social-links { display: flex; gap: 16px; }
.social-links a { font-weight: 500; transition: color var(--transition); }
.social-links a:hover { color: var(--color-accent); }

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

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copy { color: var(--color-text-muted); font-size: 0.9rem; }

/* ---------- Scroll Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .project-grid { grid-template-columns: 1fr; }
  .venture-card { grid-template-columns: 1fr; padding: 40px; text-align: center; }
  .venture-logo { max-width: 140px; margin: 0 auto; }
  .venture-tags { justify-content: center; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (min-width: 901px) and (max-width: 1100px) {
  .project-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  .nav, .header-cta { display: none; }
  .nav-toggle { display: flex; }

  .nav.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 24px;
    gap: 20px;
    max-height: calc(100vh - 76px);
    overflow-y: auto;
  }

  .nav.mobile-open .nav-link {
    font-size: 1.05rem;
    padding: 8px 0;
  }

  .container { padding: 0 20px; }

  .section { padding: 64px 0; }

  .hero { min-height: auto; padding: 130px 0 64px; }

  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; justify-content: center; }

  .section-sub { max-width: 100%; }

  .project-body { padding: 22px; }

  .venture-card { padding: 32px 24px; }
  .venture-card .btn-ghost { width: 100%; justify-content: center; }

  .faq-question { padding: 16px 18px; font-size: 0.95rem; }
  .faq-answer { padding: 0 18px; }

  .contact-form .btn { width: 100%; justify-content: center; }

  .footer-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 420px) {
  .header-inner { height: 68px; }
  .hero { padding-top: 108px; }
  .logo { font-size: 1.1rem; }
  .section { padding: 52px 0; }
  .venture-tags { gap: 8px; }
}