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

:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #6b7280;
  --color-border: #e5e7eb;
  --color-accent-1: #6366f1;
  --color-accent-2: #8b5cf6;
  --color-accent-3: #06b6d4;
  --gradient: linear-gradient(135deg, var(--color-accent-1), var(--color-accent-2), var(--color-accent-3));
  --gradient-soft: linear-gradient(135deg, rgba(99,102,241,0.08), rgba(139,92,246,0.08), rgba(6,182,212,0.08));
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.04), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.06), 0 4px 10px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.08);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

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

/* ==============================
   Navigation
   ============================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.nav__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-size: 18px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

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

.nav__link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: var(--transition);
  position: relative;
}

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

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient);
  border-radius: 1px;
  transition: var(--transition);
}

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

.nav__lang {
  display: flex;
  gap: 4px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 3px;
}

.lang-btn {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  letter-spacing: 0.5px;
}

.lang-btn.active {
  background: var(--gradient);
  color: white;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.lang-btn:hover:not(.active) {
  color: var(--color-text);
  background: var(--color-bg);
}

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

.nav__burger span {
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: rgba(250, 250, 250, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 24px;
  z-index: 99;
  flex-direction: column;
  gap: 4px;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu__link {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 10px 12px;
  border-radius: 8px;
  transition: var(--transition);
}

.mobile-menu__link:hover {
  color: var(--color-text);
  background: var(--gradient-soft);
}

/* ==============================
   Hero
   ============================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-soft);
  opacity: 0.6;
}

.hero__bg::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(99,102,241,0.06) 0%, transparent 50%),
              radial-gradient(circle at 70% 30%, rgba(139,92,246,0.05) 0%, transparent 50%),
              radial-gradient(circle at 50% 80%, rgba(6,182,212,0.04) 0%, transparent 50%);
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(30px, -30px) rotate(1deg); }
  66% { transform: translate(-20px, 20px) rotate(-1deg); }
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent-1);
  background: var(--color-surface);
  border: 1px solid rgba(99,102,241,0.2);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
  animation: fadeInUp 0.8s ease-out;
}

.hero__badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.2); }
}

.hero__name {
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 800;
  letter-spacing: -2px;
  line-height: 1.05;
  margin-bottom: 16px;
  animation: fadeInUp 0.8s ease-out 0.1s both;
}

.hero__title {
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 500;
  margin-bottom: 16px;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__tagline {
  font-size: clamp(15px, 2vw, 18px);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
  animation: fadeInUp 0.8s ease-out 0.3s both;
}

.hero__cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.btn--primary {
  background: var(--gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.btn--secondary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent-1);
}

.hero__stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  animation: fadeInUp 0.8s ease-out 0.5s both;
}

.stat {
  text-align: center;
}

.stat__number {
  display: block;
  font-size: 32px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat__label {
  font-size: 13px;
  color: var(--color-text-secondary);
  font-weight: 500;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.section--alt {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section__title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
  line-height: 1.2;
}

.section__title--center {
  text-align: center;
}

.section__subtitle {
  text-align: center;
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto 56px;
  line-height: 1.7;
}

/* ==============================
   About
   ============================== */
.about {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 48px;
  align-items: start;
}

.avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.2);
  position: relative;
}

.avatar::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background: var(--gradient);
  z-index: -1;
  opacity: 0.3;
  filter: blur(10px);
}

.avatar__initials {
  font-size: 48px;
  font-weight: 800;
  color: white;
  letter-spacing: -1px;
}

.about__bio {
  font-size: 17px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}

.about__location {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.about__location svg {
  color: var(--color-accent-1);
}

/* ==============================
   Skills Grid
   ============================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

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

.skill-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient);
  opacity: 0;
  transition: var(--transition);
}

.skill-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

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

.skill-card__icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--gradient-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.skill-card__icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--color-accent-1);
}

.skill-card__title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.skill-card__desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ==============================
   Timeline
   ============================== */
.timeline {
  max-width: 700px;
  margin: 48px auto 0;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline__item {
  position: relative;
  padding-left: 48px;
  padding-bottom: 40px;
}

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

.timeline__dot {
  position: absolute;
  left: 8px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 3px solid var(--color-accent-1);
  z-index: 1;
}

.timeline__item:first-child .timeline__dot {
  background: var(--gradient);
  border-color: var(--color-accent-1);
  box-shadow: 0 0 0 4px rgba(99,102,241,0.15);
}

.timeline__card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.timeline__card:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.timeline__header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.timeline__date {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.timeline__badge {
  font-size: 11px;
  font-weight: 600;
  color: #16a34a;
  background: #dcfce7;
  padding: 2px 10px;
  border-radius: 100px;
  letter-spacing: 0.3px;
}

.timeline__role {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}

.timeline__company {
  font-size: 14px;
  color: var(--color-accent-1);
  font-weight: 500;
  margin-bottom: 12px;
}

.timeline__desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ==============================
   Projects Grid
   ============================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

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

.project-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient);
  transform: scaleX(0);
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.project-card:hover::after {
  transform: scaleX(1);
}

.project-card__header {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.project-card__header svg {
  stroke: white;
}

.project-card__title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.project-card__desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  font-size: 12px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 100px;
  background: var(--gradient-soft);
  color: var(--color-accent-1);
  border: 1px solid rgba(99,102,241,0.1);
}

/* ==============================
   Certifications
   ============================== */
.certs-row {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 48px;
}

.cert-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 28px 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  min-width: 180px;
  transition: var(--transition);
}

.cert-badge:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.cert-badge__icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 800;
  color: white;
  letter-spacing: -0.5px;
}

.cert-badge__label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-align: center;
  line-height: 1.4;
}

/* ==============================
   Contact
   ============================== */
.contact {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact__subtitle {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 40px;
}

.contact__links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.contact__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 500;
  padding: 14px 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  min-width: 300px;
  justify-content: center;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.contact__link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent-1);
  color: var(--color-accent-1);
}

.contact__link svg {
  flex-shrink: 0;
}

/* ==============================
   Footer
   ============================== */
.footer {
  padding: 32px 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.footer__text {
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* ==============================
   Scroll Reveal
   ============================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ==============================
   Responsive
   ============================== */
@media (max-width: 768px) {
  .nav__links {
    display: none;
  }

  .nav__burger {
    display: flex;
  }

  .hero {
    padding: 100px 20px 60px;
  }

  .hero__stats {
    gap: 24px;
  }

  .stat__number {
    font-size: 24px;
  }

  .about {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
  }

  .about__location {
    justify-content: center;
  }

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

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

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

  .cert-badge {
    width: 100%;
    max-width: 300px;
  }

  .contact__link {
    min-width: unset;
    width: 100%;
    max-width: 300px;
  }

  .section {
    padding: 60px 0;
  }

  .timeline__item {
    padding-left: 40px;
  }
}

@media (max-width: 480px) {
  .hero__name {
    letter-spacing: -1px;
  }

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

  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
}