/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
  --color-bg: #ffffff;
  --color-surface: #f8fafc;
  --color-surface2: #f1f5f9;
  --color-border: #e2e8f0;
  --color-ink: #0f172a;
  --color-ink-2: #334155;
  --color-ink-3: #64748b;
  --color-ink-4: #94a3b8;
  --color-primary: #1F2937;
  --color-primary-soft: rgba(31, 41, 55, 0.07);
  --color-accent: #6264f4;

  --font-display: 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;

  --r-sm: 0.5rem;
  --r-md: 0.75rem;
  --r-lg: 1rem;
  --r-xl: 1.5rem;
  --r-2xl: 2rem;
  --r-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, .07), 0 1px 2px rgba(0, 0, 0, .05);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, .08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, .12);
  --shadow-xl: 0 24px 64px rgba(0, 0, 0, .14);

  --transition: 220ms ease;
  --transition-slow: 500ms cubic-bezier(.22, .68, 0, 1.2);

  --max-w: 1280px;
  --px: clamp(1.25rem, 5vw, 2.5rem);
}

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

html {
  scroll-behavior: smooth;
}

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

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

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

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

/* Material Icons baseline alignment */
.material-symbols-outlined {
  font-family: 'Material Symbols Outlined';
  font-weight: normal;
  font-style: normal;
  display: inline-block;
  line-height: 1;
  vertical-align: middle;
  letter-spacing: normal;
  text-transform: none;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-smoothing: antialiased;
}

/* ============================================================
   UTILITY
   ============================================================ */
.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--px);
}

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.nav.scrolled {
  box-shadow: var(--shadow-md);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.1rem;
  gap: 1rem;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-ink);
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.nav__logo-icon {
  width: 1.6rem;
  height: 1.6rem;
  color: var(--color-primary);
}

.nav__logo:hover {
  opacity: 0.8;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-ink-3);
  transition: color var(--transition);
}

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

.nav__cta {
  background: var(--color-primary) !important;
  color: #fff !important;
  padding: 0.6rem 1.25rem;
  border-radius: var(--r-full);
  font-weight: 700 !important;
  font-size: 0.875rem;
  transition: background var(--transition), transform var(--transition);
}

.nav__cta:hover {
  background: #111827 !important;
  transform: translateY(-1px);
}

.nav__hamburger {
  display: none;
  color: var(--color-ink);
  font-size: 1.5rem;
  padding: 0.25rem;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.85rem 2rem;
  border-radius: var(--r-lg);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  align-self: flex-start;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(31, 41, 55, 0.2);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(31, 41, 55, 0.28);
}

.btn--outline {
  background: transparent;
  color: var(--color-ink);
  border: 1.5px solid var(--color-border);
}

.btn--outline:hover {
  background: var(--color-surface);
  border-color: var(--color-ink-4);
}

.btn--white {
  background: #fff;
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
  font-weight: 700;
  padding: 0.85rem 2rem;
  border-radius: var(--r-lg);
  display: inline-flex;
  align-items: center;
  transition: transform var(--transition), box-shadow var(--transition);
}

.btn--white:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  padding-block: clamp(4rem, 10vw, 8rem);
  overflow: hidden;
  min-height: 85vh;
  display: flex;
  align-items: center;
}

.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.hero__bg-icon {
  position: absolute;
  color: var(--color-ink-4);
  opacity: 0;
  animation: fadeInIcon 0.6s ease forwards;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.hero__bg-icon:hover {
  opacity: 0.4 !important;
  transform: scale(1.1);
}

@keyframes fadeInIcon {
  to {
    opacity: 0.15;
  }
}

.hero__content {
  position: relative;
  z-index: 1;
  width: 100%;
  display: flex;
  justify-content: center;
}

.hero__card {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 2.5rem;
  padding: clamp(2rem, 5vw, 4rem) clamp(1.5rem, 5vw, 3.5rem);
  max-width: 860px;
  width: 100%;
  text-align: center;
  box-shadow: 0 8px 48px rgba(0, 0, 0, 0.06);
}

.badge {
  display: inline-block;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.35rem 1rem;
  border-radius: var(--r-full);
  margin-bottom: 1.5rem;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7vw, 4rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: var(--color-ink);
  margin-bottom: 1.25rem;
}

.hero__title em {
  font-style: normal;
  font-size: 4rem;
  color: var(--color-primary);
}

.hero__lead {
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 500;
  color: var(--color-ink-2);
  max-width: 600px;
  margin-inline: auto;
  margin-bottom: 0.75rem;
}

.hero__sub {
  font-size: 1rem;
  color: var(--color-ink-3);
  max-width: 580px;
  margin-inline: auto;
  margin-bottom: 2rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
}

/* ============================================================
   TECH STACK
   ============================================================ */
.stack {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  padding-block: 2.5rem;
}

.stack__label {
  text-align: center;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink-4);
  margin-bottom: 2rem;
}

.stack__items {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 2rem 3rem;
  opacity: 0.5;
  filter: grayscale(1);
  transition: opacity 0.4s, filter 0.4s;
}

.stack__items:hover {
  opacity: 1;
  filter: grayscale(0);
}

.stack__item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-ink);
}

.stack__item .material-symbols-outlined {
  font-size: 1.6rem;
}

/* ============================================================
   SECTION SHARED
   ============================================================ */
.section-header {
  margin-bottom: 4rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-ink);
  margin-bottom: 0.5rem;
}

.section-sub {
  font-size: 1.05rem;
  color: var(--color-ink-3);
}

.overline {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  display: block;
  margin-bottom: 0.75rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
}

.tags li {
  background: var(--color-surface2);
  color: var(--color-ink-3);
  padding: 0.25rem 0.75rem;
  border-radius: var(--r-full);
  font-size: 0.8rem;
  font-weight: 500;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-primary);
  transition: gap var(--transition);
}

.link-arrow:hover {
  gap: 0.6rem;
}

.link-arrow .material-symbols-outlined {
  font-size: 1rem;
}

/* ============================================================
   FEATURED PROJECTS
   ============================================================ */
.projects {
  padding-block: clamp(4rem, 8vw, 7rem);
}

.projects__list {
  display: flex;
  flex-direction: column;
  gap: clamp(4rem, 8vw, 7rem);
}

.project-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 3rem;
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.project-row--reverse .project-row__text {
  order: 1;
}

.project-row--reverse .project-row__image {
  order: 2;
}

.project-row__text {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.project-row__text h3 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.02em;
}

.project-row__text p {
  color: var(--color-ink-3);
  font-size: 1.05rem;
  line-height: 1.7;
}

.project-row__image {
  overflow: hidden;
  border-radius: var(--r-xl);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
}

.project-row__image img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  transition: transform 0.7s cubic-bezier(.22, .68, 0, 1.1);
}

.project-row:hover .project-row__image img {
  transform: scale(1.04);
}

/* ============================================================
   PROJECTS GRID
   ============================================================ */
.grid-projects {
  background: var(--color-surface);
  padding-block: clamp(3rem, 6vw, 5rem);
}

.grid-projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.grid-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--r-xl);
  padding: 1.5rem;
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

.grid-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: rgba(31, 41, 55, 0.15);
  transform: translateY(-3px);
}

.grid-card__img {
  aspect-ratio: 16/9;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--color-surface2);
  margin-bottom: 1.1rem;
}

.grid-card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.grid-card h4 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 0.4rem;
}

.grid-card p {
  font-size: 0.9rem;
  color: var(--color-ink-3);
  line-height: 1.6;
}

/* ============================================================
   LAB
   ============================================================ */
.lab {
  padding-block: clamp(4rem, 8vw, 6rem);
  background: var(--color-bg);
}

.lab__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.lab__header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.lab__header p {
  color: var(--color-ink-3);
  margin-top: 0.25rem;
}

.lab__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.lab-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(0, 0, 0, 0.05);
  border-radius: var(--r-xl);
  padding: 2rem;
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

.lab-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: rgba(31, 41, 55, 0.1);
  transform: translateY(-4px);
}

.lab-card__icon {
  width: 3rem;
  height: 3rem;
  border-radius: var(--r-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.lab-card__icon--blue {
  background: rgba(98, 100, 244, 0.08);
  color: var(--color-accent);
}

.lab-card__icon--green {
  background: rgba(16, 185, 129, 0.08);
  color: #059669;
}

.lab-card__icon--amber {
  background: rgba(245, 158, 11, 0.08);
  color: #d97706;
}

.lab-card h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-ink);
}

.lab-card p {
  font-size: 0.9rem;
  color: var(--color-ink-3);
  line-height: 1.65;
}

/* ============================================================
   SERVICES
   ============================================================ */
.services {
  background: var(--color-surface);
  padding-block: clamp(4rem, 8vw, 6rem);
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
  margin-top: 3rem;
}

.service {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.service__icon {
  font-size: 2.5rem;
  color: var(--color-primary);
}

.service h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink);
}

.service p {
  color: var(--color-ink-3);
  line-height: 1.65;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about {
  padding-block: clamp(4rem, 8vw, 6rem);
  border-top: 1px solid var(--color-border);
}

.about__inner {
  max-width: 700px;
  margin-inline: auto;
  text-align: center;
}

.about__inner h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.about__inner p {
  font-size: 1.15rem;
  color: var(--color-ink-3);
  line-height: 1.75;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact {
  background: var(--color-primary);
  color: #fff;
  padding-block: clamp(4rem, 8vw, 6rem);
}

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.contact__left {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact__left h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.contact__left p {
  font-size: 1.1rem;
  opacity: 0.85;
  line-height: 1.6;
}

.contact__links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.contact__links a {
  font-weight: 700;
  opacity: 0.8;
  transition: opacity var(--transition);
}

.contact__links a:hover {
  opacity: 1;
  text-decoration: underline;
}

.contact__form-wrap {
  background: #fff;
  border-radius: var(--r-2xl);
  padding: 2.5rem;
  box-shadow: var(--shadow-xl);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.hp-field {
  display: none;
  visibility: hidden;
  height: 0;
  width: 0;
  overflow: hidden;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-ink);
}

.form-group input,
.form-group textarea {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: 0.8rem 1rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-ink);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-ink-4);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(31, 41, 55, 0.08);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: #fff;
  border-top: 1px solid var(--color-border);
  padding-block: 2.5rem;
  color: var(--color-ink-3);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  color: var(--color-ink);
}

.footer__icon {
  width: 1.1rem;
  height: 1.1rem;
  color: var(--color-ink-4);
}

.footer__copy {
  font-size: 0.78rem;
}

.footer__tech {
  font-size: 0.78rem;
}

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

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

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .nav__links {
    display: none;
  }

  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.97);
    padding: 1.5rem;
    border-bottom: 1px solid var(--color-border);
    gap: 1.25rem;
    box-shadow: var(--shadow-md);
  }

  .nav__hamburger {
    display: flex;
  }

  .nav {
    position: relative;
  }

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

  .project-row--reverse .project-row__text {
    order: 0;
  }

  .project-row--reverse .project-row__image {
    order: 0;
  }

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

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

  .services__grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .contact__grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

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

  .footer__inner {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }
}

@media (max-width: 640px) {
  .hero__card {
    border-radius: 1.5rem;
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

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

  .lab__header {
    flex-direction: column;
  }

  .contact__form-wrap {
    padding: 1.5rem;
  }
}