/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #0f0f17;
  --bg-card: #13131d;
  --bg-card-hover: #1a1a2e;
  --border: #1e1e32;
  --text-primary: #e8e8ef;
  --text-secondary: #8888a4;
  --text-muted: #55556a;
  --accent: #6c5ce7;
  --accent-light: #a29bfe;
  --accent-glow: rgba(108, 92, 231, 0.25);
  --gradient: linear-gradient(135deg, #6c5ce7, #a29bfe);
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --container: 1140px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition);
}

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

::selection {
  background: var(--accent);
  color: #fff;
}

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

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

.accent { color: var(--accent-light); }

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  letter-spacing: 0.02em;
}

.btn--primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 24px var(--accent-glow);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--accent-glow);
}

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

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

.btn--full { width: 100%; }

/* ============================================
   HEADER
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}

.header--scrolled {
  border-bottom-color: var(--border);
  padding: 12px 0;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo__dot { color: var(--accent-light); }

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

.nav__link {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient);
  border-radius: 1px;
  transition: width var(--transition);
}

.nav__link:hover,
.nav__link.active {
  color: var(--text-primary);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

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

.burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

.burger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.burger.active span:nth-child(2) { opacity: 0; }
.burger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

#particles {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.4;
}

.hero__inner {
  position: relative;
  z-index: 2;
  padding-top: 80px;
}

.hero__greeting {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent-light);
  margin-bottom: 12px;
  opacity: 0;
  animation: fadeUp 0.6s ease forwards 0.2s;
}

.hero__name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 8px;
  opacity: 0;
  animation: fadeUp 0.6s ease forwards 0.4s;
}

.hero__title {
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 300;
  color: var(--text-secondary);
  margin-bottom: 24px;
  opacity: 0;
  animation: fadeUp 0.6s ease forwards 0.6s;
}

.hero__desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin-bottom: 40px;
  opacity: 0;
  animation: fadeUp 0.6s ease forwards 0.8s;
}

.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.6s ease forwards 1s;
}

.hero__scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0;
  animation: fadeIn 0.6s ease forwards 1.4s;
}

.hero__scroll-line {
  width: 1px;
  height: 60px;
  background: var(--gradient);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.5); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
  padding: 100px 0;
}

.section--alt {
  background: var(--bg-secondary);
}

.section__title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 600;
  text-align: center;
  margin-bottom: 60px;
  letter-spacing: -0.02em;
  position: relative;
}

.section__title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--gradient);
  border-radius: 2px;
  margin: 16px auto 0;
}

/* ============================================
   ABOUT
   ============================================ */
.about__grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 60px;
  align-items: center;
}

.about__photo {
  width: 280px;
  height: 320px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  overflow: hidden;
  position: relative;
}

.about__photo::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: var(--gradient);
  border-radius: var(--radius);
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition);
}

.about__photo:hover::before { opacity: 1; }

.about__photo-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.about__photo-placeholder svg {
  width: 80px;
  height: 80px;
}

.about__text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-size: 1.05rem;
}

.about__stats {
  display: flex;
  gap: 48px;
  margin-top: 32px;
}

.stat { text-align: center; }

.stat__number {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent-light);
}

.stat__plus {
  font-size: 1.5rem;
  color: var(--accent-light);
}

.stat__label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============================================
   SKILLS
   ============================================ */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 24px;
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.skill-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity var(--transition);
}

.skill-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.skill-card:hover::before { opacity: 1; }

.skill-card__icon {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 500;
  color: var(--accent-light);
  margin-bottom: 16px;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: var(--radius-sm);
}

.skill-card__title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.skill-card__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   PROJECTS
   ============================================ */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35);
}

.project-card__preview {
  height: 200px;
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card-hover));
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.project-card__img-placeholder {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 700;
  color: var(--text-muted);
  opacity: 0.3;
}

.project-card__preview::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient);
  opacity: 0;
  transition: opacity var(--transition);
}

.project-card:hover .project-card__preview::after {
  opacity: 0.1;
}

.project-card__body {
  padding: 24px;
}

.project-card__title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.project-card__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 4px 12px;
  background: var(--accent-glow);
  color: var(--accent-light);
  border-radius: 20px;
  letter-spacing: 0.01em;
}

.project-card__links {
  display: flex;
  gap: 20px;
}

.project-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--accent-light);
  transition: color var(--transition);
}

.project-link:hover {
  color: #fff;
}

/* ============================================
   EXPERIENCE / TIMELINE
   ============================================ */
.timeline {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline__item {
  position: relative;
  padding-bottom: 48px;
}

.timeline__item:last-child { padding-bottom: 0; }

.timeline__dot {
  position: absolute;
  left: -36px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gradient);
  border: 3px solid var(--bg-secondary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.timeline__date {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-light);
  margin-bottom: 8px;
  display: block;
}

.timeline__role {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline__company {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.timeline__desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============================================
   CONTACT
   ============================================ */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.contact__text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.7;
}

.contact__links {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.contact__link {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: color var(--transition);
}

.contact__link:hover { color: var(--accent-light); }

.contact__link-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  transition: all var(--transition);
}

.contact__link:hover .contact__link-icon {
  border-color: var(--accent);
  background: var(--accent-glow);
}

/* Form */
.form__group { margin-bottom: 18px; }

.form__input {
  width: 100%;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.95rem;
  transition: all var(--transition);
  outline: none;
}

.form__input::placeholder { color: var(--text-muted); }

.form__input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form__textarea { resize: vertical; min-height: 120px; }

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

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

.footer__copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer__socials {
  display: flex;
  gap: 12px;
}

.footer__social {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.footer__social:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  background: var(--accent-glow);
}

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

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

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .about__photo-wrap {
    display: flex;
    justify-content: center;
  }

  .about__stats { justify-content: center; }

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

@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 100px 40px 40px;
    gap: 24px;
    border-left: 1px solid var(--border);
    transition: right var(--transition);
  }

  .nav.open { right: 0; }

  .nav__link { font-size: 1.1rem; }

  .burger { display: flex; }

  .hero__name { font-size: clamp(2rem, 8vw, 3rem); }

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

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

@media (max-width: 480px) {
  .section { padding: 60px 0; }

  .hero__actions {
    flex-direction: column;
  }

  .btn { width: 100%; }

  .about__stats { gap: 24px; }

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