/* ============================================================
   Portofino Blue palette
============================================================ */
:root {
  --bg:         #060D18;
  --surface:    #0B1828;
  --surface-2:  #112033;
  --blue:       #1C4590;
  --blue-mid:   #2E65BB;
  --blue-shine: #5E96D6;
  --blue-dim:   rgba(94, 150, 214, 0.10);
  --text:       #EBF0F9;
  --text-muted: #7A98B8;
  --border:     rgba(94, 150, 214, 0.13);
  --font-head:  'Barlow Condensed', sans-serif;
  --font-body:  'Barlow', sans-serif;
  --wrap:       1160px;
  --px:         28px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a   { color: inherit; text-decoration: none; }
ul  { list-style: none; }

/* ============================================================
   Typography
============================================================ */
h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(4.5rem, 12vw, 10rem);
  line-height: 0.92;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  color: var(--text);
}

h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.1;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 1.1rem;
}

h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  line-height: 1.2;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 0.6rem;
}

p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.78;
  margin-bottom: 0.9rem;
}
p:last-child { margin-bottom: 0; }

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

/* ============================================================
   Layout
============================================================ */
.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--px);
}

.section { padding: 88px 0; }

/* ============================================================
   Navigation
============================================================ */
#navbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 900;
  padding: 0 var(--px);
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s;
}

#navbar.scrolled {
  background: rgba(6, 13, 24, 0.93);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--border);
}

.nav-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.6rem;
  letter-spacing: 0.14em;
  color: var(--blue-shine);
  transition: opacity 0.2s;
}
.logo:hover { opacity: 0.75; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

.nav-cta {
  background: var(--blue);
  color: #fff !important;
  padding: 8px 20px;
  transition: background 0.2s !important;
}
.nav-cta:hover { background: var(--blue-mid) !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  width: 36px;
  height: 36px;
  justify-content: center;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: transform 0.28s, opacity 0.28s;
  transform-origin: center;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   Hero
============================================================ */
#hero {
  position: relative;
  min-height: 82vh;
  display: flex;
  align-items: flex-end;
  padding-bottom: 72px;
  overflow: hidden;
}

/* Portofino Blue metallic background */
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 30%, rgba(44, 101, 187, 0.18) 0%, transparent 65%),
    linear-gradient(160deg, #060D18 0%, #0B1F3A 40%, #0D2244 60%, #060D18 100%);
  z-index: 0;
}

/* Fine brushed-metal lines */
.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(
      105deg,
      transparent,
      transparent 2px,
      rgba(94, 150, 214, 0.03) 2px,
      rgba(94, 150, 214, 0.03) 4px
    );
}

/* Subtle sheen at top-right */
.hero-bg::after {
  content: '';
  position: absolute;
  top: -10%;
  right: -5%;
  width: 55%;
  height: 70%;
  background: radial-gradient(ellipse, rgba(30, 69, 144, 0.22) 0%, transparent 60%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--wrap);
  width: 100%;
  margin: 0 auto;
  padding: 66px var(--px) 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 40px;
}

/* Left column content */
.hero-content {
  animation: heroEntrance 0.85s cubic-bezier(0.25, 0.46, 0.45, 0.94) both;
}

@keyframes heroEntrance {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Right column: gear visual */
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  animation: gearFadeIn 1.6s ease both;
}

@keyframes gearFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.gear-svg {
  width: 100%;
  max-width: 440px;
  height: auto;
  color: var(--blue-shine);
  opacity: 0.13;
  overflow: visible;
}

/* Carrier layer: ring + planets + arms — 1 rev per 120s */
.diff-carrier {
  transform-box: fill-box;
  transform-origin: 250px 250px;
  animation: diffCarrier 120s linear infinite;
}

/* Sun gear: 4× carrier speed (N_sun+N_ring)/N_sun = (18+54)/18 = 4 */
.diff-sun {
  transform-box: fill-box;
  transform-origin: 250px 250px;
  animation: diffSun 30s linear infinite;
}

@keyframes diffCarrier { to { transform: rotate(360deg); } }
@keyframes diffSun     { to { transform: rotate(360deg); } }

.hero-top {
  display: flex;
  align-items: baseline;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.hero-role {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--blue-shine);
}

.hero-current {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hero-line {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 520px;
  margin: 1.25rem 0 2.25rem;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  gap: 0.875rem;
  flex-wrap: wrap;
}

/* ============================================================
   Buttons
============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 13px 30px;
  cursor: pointer;
  border: none;
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
}

.btn-solid {
  background: var(--blue);
  color: #fff;
}
.btn-solid:hover {
  background: var(--blue-mid);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(94, 150, 214, 0.3);
}
.btn-ghost:hover {
  border-color: rgba(94, 150, 214, 0.65);
  transform: translateY(-1px);
}

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

/* ============================================================
   Reveal
============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   About + Behind BMJ
============================================================ */
.about-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-col { }

.skills-line {
  margin-top: 1.5rem;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--blue-shine);
  text-transform: uppercase;
  border-top: 1px solid var(--border);
  padding-top: 1.1rem;
}

/* ============================================================
   Projects
============================================================ */
.section-h {
  margin-bottom: 36px;
}

/* Featured: JRS Kart */
.project-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--border);
  background: var(--surface);
  margin-bottom: 24px;
  overflow: hidden;
  transition: border-color 0.25s;
}
.project-feature:hover { border-color: rgba(94, 150, 214, 0.38); }

.pf-img { overflow: hidden; }

/* Placeholder visuals */
.ph {
  width: 100%;
  height: 100%;
  min-height: 340px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.5s ease;
}

.project-feature:hover .ph,
.proj-card:hover      .ph { transform: scale(1.04); }

.p-kart   { background: linear-gradient(140deg, #07101E 0%, #0F2850 45%, #0B1E3A 100%); }
.p-gears  { background: linear-gradient(140deg, #05080F 0%, #0A1626 50%, #060C18 100%); }
.p-engine { background: linear-gradient(140deg, #080910 0%, #0E1328 50%, #060810 100%); }
.p-patent { background: linear-gradient(140deg, #060D18 0%, #0C1D38 50%, #070E1C 100%); }

.pf-body {
  padding: 44px 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.proj-num {
  font-family: var(--font-head);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1;
  color: rgba(94, 150, 214, 0.18);
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
  display: block;
}

.pf-body h3 { margin-bottom: 0.8rem; }

.proj-list {
  list-style: none;
  margin-top: 1.25rem;
}

.proj-list li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 7px 0 7px 16px;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.proj-list li:last-child { border-bottom: none; }
.proj-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue-shine);
}

/* Project grid (3 cards) */
.proj-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.proj-card {
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}
.proj-card:hover {
  border-color: rgba(94, 150, 214, 0.35);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(30, 69, 144, 0.15);
}

.proj-card .ph { min-height: 180px; }

.proj-card-body { padding: 22px 22px 26px; }

.proj-card-body .proj-num {
  font-size: 2.25rem;
  margin-bottom: 0.3rem;
}

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

.contact-cols {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: start;
}

.contact-left h2 { margin-bottom: 0.8rem; }

.contact-direct {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 1.75rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color 0.2s;
  word-break: break-all;
}
.contact-link:hover { color: var(--blue-shine); }

/* Form */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.form-group label {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 11px 14px;
  outline: none;
  resize: vertical;
  width: 100%;
  transition: border-color 0.2s;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: #2a3a50; }
.form-group input:focus,
.form-group textarea:focus { border-color: var(--blue-mid); }

.form-status {
  font-size: 0.82rem;
  text-align: center;
  margin-top: 8px;
  min-height: 1.2em;
}

/* ============================================================
   Footer
============================================================ */
footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

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

.footer-logo {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--blue-shine);
  letter-spacing: 0.14em;
}

footer nav {
  display: flex;
  gap: 1.75rem;
}

footer nav a {
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.2s;
}
footer nav a:hover { color: var(--text); }

.footer-copy {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: 0;
}

/* ============================================================
   Responsive: tablet
============================================================ */
@media (max-width: 900px) {
  .section { padding: 64px 0; }

  /* Hero: collapse to single column, hide gear */
  .hero-inner { grid-template-columns: 1fr; gap: 0; }
  .hero-visual { display: none; }

  .about-cols {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .project-feature {
    grid-template-columns: 1fr;
  }

  .ph { min-height: 260px; }

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

  .contact-cols {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: 16px;
  }

  footer nav { flex-wrap: wrap; justify-content: center; }
}

/* ============================================================
   Responsive: mobile
============================================================ */
@media (max-width: 680px) {
  .section { padding: 52px 0; }

  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: 66px;
    left: 0; right: 0;
    background: rgba(6,13,24,0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-direction: column;
    gap: 0;
    padding: 8px 0 20px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-110%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s cubic-bezier(0.4,0,0.2,1), opacity 0.3s;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-links li { border-bottom: 1px solid var(--border); }
  .nav-links li:last-child { border-bottom: none; }

  .nav-links a { display: block; padding: 15px var(--px); }

  .nav-cta {
    display: inline-block;
    margin: 8px var(--px) 0;
    padding: 12px 20px;
  }

  h1 { font-size: clamp(3.5rem, 15vw, 5.5rem); }

  .hero-top { flex-direction: column; gap: 4px; }

  .hero-actions { flex-direction: column; }

  .form-row { grid-template-columns: 1fr; }

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

  .pf-body { padding: 28px 22px; }
}