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

:root {
  --bg:           #0A0A0A;
  --bg-subtle:    #111111;
  --bg-card:      #141414;
  --white:        #ffffff;
  --text-primary: #ffffff;
  --text-secondary: #888888;
  --text-muted:   #555555;
  --accent:       #4DB8C8;
  --accent-dim:   rgba(77, 184, 200, 0.4);
  --border:       rgba(255, 255, 255, 0.08);

  --font-main: 'Poppins', sans-serif;

  --container: 1200px;
  --section-pad: 120px;
  --radius: 4px;
  --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

/* =============================================
   LAYOUT
============================================= */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
}

/* =============================================
   NAVIGATION
============================================= */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 28px 0;
  transition: background var(--transition), padding var(--transition);
}

.nav.scrolled {
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--white);
  display: flex;
  align-items: center;
  gap: 8px;
  text-transform: uppercase;
}

.nav__logo-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

.nav__links {
  display: flex;
  gap: 40px;
}

.nav__links a {
  font-family: var(--font-main);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width var(--transition);
}

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

.nav__links a:hover::after {
  width: 100%;
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__hamburger span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--white);
  transition: var(--transition);
}

/* =============================================
   MOBILE MENU
============================================= */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--bg);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.mobile-menu.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu ul {
  display: flex;
  flex-direction: column;
  gap: 32px;
  text-align: center;
}

.mobile-menu a {
  font-family: var(--font-main);
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--white);
  transition: color var(--transition);
}

.mobile-menu a:hover {
  color: var(--accent);
}

/* =============================================
   HERO
============================================= */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 0 60px;
  max-width: var(--container);
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

.hero__content {
  position: relative;
  z-index: 2;
  padding-top: 140px;
}

.hero__name {
  font-family: var(--font-main);
  font-weight: 300;
  font-size: 0.9rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
  margin-top: 20px;
  margin-bottom: 0;
  opacity: 0;
  animation: fadeUp 0.9s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.5s forwards;
}

.hero__title {
  font-family: var(--font-main);
  font-size: clamp(6rem, 15vw, 18rem);
  font-weight: 600;
  line-height: 1.0;
  letter-spacing: -0.03em;
  color: var(--white);
  opacity: 0;
  animation: fadeUp 0.9s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.3s forwards;
}

.hero__sub {
  font-family: var(--font-main);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-top: 12px;
  opacity: 0;
  animation: fadeUp 0.9s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.65s forwards;
}

.hero__scroll {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 72px;
  opacity: 0;
  animation: fadeUp 0.9s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.7s forwards;
}

.hero__scroll span {
  font-family: var(--font-main);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hero__scroll-line {
  width: 60px;
  height: 1px;
  background: var(--text-muted);
  position: relative;
  overflow: hidden;
}

.hero__scroll-line::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--accent);
  animation: slide 2.2s ease-in-out infinite;
}

/* Concentric circles (right bottom) */
.hero__deco {
  position: absolute;
  right: -5%;
  top: -15%;
  pointer-events: none;
  opacity: 0;
  animation: fadeIn 1.4s ease 0.8s forwards;
}

.hero__circle-outer {
  width: 380px;
  height: 380px;
  border-radius: 50%;
  border: 1px solid var(--accent-dim);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__circle-inner {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 1.0;
}

/* Gradient line at bottom of hero */
.hero__gradient-line {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--accent), transparent);
}

/* =============================================
   SECTION COMMON
============================================= */
.section {
  padding: var(--section-pad) 0;
}

.section__header {
  display: flex;
  align-items: baseline;
  gap: 20px;
  margin-bottom: 72px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.section__num {
  font-family: var(--font-main);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.section__title {
  font-family: var(--font-main);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

/* =============================================
   PROFILE
============================================= */
.profile {
  background: var(--bg);
}

.profile__inner {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 80px;
  align-items: start;
}

.profile__image-wrap {
  position: relative;
}

.profile__image-bg {
  position: absolute;
  top: 16px;
  left: 16px;
  right: -16px;
  bottom: -16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  z-index: 0;
}

.profile__image {
  position: relative;
  z-index: 1;
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
  border-radius: var(--radius);
}

.profile__image-placeholder {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}

.profile__image-placeholder span {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.profile__name {
  font-family: var(--font-main);
  font-size: 2rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 8px;
}

.profile__role {
  font-family: var(--font-main);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 32px;
}

.profile__bio {
  font-size: 0.9375rem;
  line-height: 2.0;
  color: var(--text-secondary);
  margin-bottom: 48px;
}

.profile__meta {
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-top: 1px solid var(--border);
  padding-top: 32px;
}

.profile__meta li {
  display: flex;
  gap: 24px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.profile__meta li span {
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.6875rem;
  color: var(--text-muted);
  min-width: 100px;
}

/* =============================================
   SKILLS
============================================= */
.skills {
  background: var(--bg-subtle);
}

.skills__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
}

.skill-card {
  background: var(--bg-subtle);
  padding: 48px 36px;
  transition: background var(--transition), transform var(--transition);
}

.skill-card:hover {
  background: var(--bg-card);
  transform: translateY(-4px);
}

.skill-card__icon {
  font-size: 1.25rem;
  margin-bottom: 24px;
  color: var(--accent);
}

.skill-card__title {
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 20px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.skill-card__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.skill-card__list li {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
  padding-left: 16px;
  position: relative;
}

.skill-card__list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.625rem;
  top: 3px;
}

/* =============================================
   WORKS
============================================= */
.works {
  background: var(--bg);
}

.works__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
  max-width: 900px;
}

.work-card {
  cursor: pointer;
}

.work-card__thumb {
  position: relative;
  aspect-ratio: 16/10;
  background: var(--bg-card);
  overflow: hidden;
  border-radius: var(--radius);
  margin-bottom: 20px;
  border: 1px solid var(--border);
}

.work-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--transition);
}

.work-card:hover .work-card__thumb img {
  transform: scale(1.04);
}

.work-card__thumb-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-main);
  font-size: 3rem;
  font-weight: 600;
  color: var(--border);
  z-index: 0;
}

.work-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 10, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
  z-index: 2;
}

.work-card:hover .work-card__overlay {
  opacity: 1;
}

.work-card__link {
  font-family: var(--font-main);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 10px 28px;
  border-radius: 100px;
  transition: background var(--transition), border-color var(--transition);
}

.work-card__link:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.work-card__tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.work-card__tags .work-card__tag {
  margin-bottom: 0;
}

.work-card__tag {
  display: inline-block;
  font-family: var(--font-main);
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  padding: 3px 10px;
  border-radius: 100px;
  margin-bottom: 10px;
}

.work-card__tag--appstore {
  color: #fff;
  background: rgba(77, 184, 200, 0.15);
  border-color: rgba(77, 184, 200, 0.4);
}

.work-card__title {
  font-family: var(--font-main);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 6px;
}

.work-card__desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  line-height: 1.6;
}

/* =============================================
   FOOTER
============================================= */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0 0;
  position: relative;
}

.footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 32px;
}

.footer__logo {
  font-family: var(--font-main);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--text-secondary);
}

.footer__copy {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.footer__gradient-line {
  height: 2px;
  background: linear-gradient(to right, transparent 0%, var(--accent) 50%, transparent 100%);
}

/* =============================================
   ANIMATIONS
============================================= */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes slide {
  0%   { left: -100%; }
  50%  { left: 100%; }
  100% { left: 100%; }
}

/* =============================================
   RESPONSIVE
============================================= */
@media (max-width: 1024px) {
  .skills__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .profile__inner {
    grid-template-columns: 280px 1fr;
    gap: 48px;
  }
}

@media (max-width: 768px) {
  :root {
    --section-pad: 80px;
  }

  .container {
    padding: 0 24px;
  }

  .nav__inner {
    padding: 0 24px;
  }

  .nav__links {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .mobile-menu {
    display: flex;
  }

  .hero {
    padding: 0 24px;
    padding-top: 100px;
  }

  .hero__deco {
    display: none;
  }

  .profile__inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .profile__image-wrap {
    max-width: 280px;
  }

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

  .works__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer .container {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .section__header {
    margin-bottom: 48px;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: 3.5rem;
  }
}