@font-face {
  font-family: 'Inter';
  src: url('../fonts/Inter-Regular.woff2') format('woff2'),
       url('../fonts/Inter-Regular.woff') format('woff');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('../fonts/Inter-Bold.woff2') format('woff2'),
       url('../fonts/Inter-Bold.woff') format('woff');
  font-weight: 700;
  font-display: swap;
}

:root {
  --color-bg: #0D0E12;
  --color-text: #E0E0E0;
  --color-accent: #1E90FF;
  --color-accent-soft: #286CFF33;
  --color-glass: rgba(25, 28, 38, 0.75);
  --color-glass-border: rgba(46,70,139,0.25);
  --gap: clamp(1rem, 2vw, 4rem);
  --radius: 2rem;
  --shadow: 0 4px 24px 0 rgba(30, 144, 255, 0.07);
  font-size: 18px;
  font-family: 'Inter', system-ui, Arial, sans-serif;
  color-scheme: dark;
}
html, body {
  background: var(--color-bg);
  color: var(--color-text);
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
}
body {
  min-height: 100dvh;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--gap);
  width: 100%;
}
header.header {
  background: transparent;
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--gap) 0;
}
.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.1em;
  text-decoration: none;
}
nav a.nav-link {
  color: var(--color-text);
  text-decoration: none;
  margin: 0 1.5rem;
  font-weight: 500;
  transition: color 0.2s;
  position: relative;
}
nav a.nav-link:hover {
  color: var(--color-accent);
}
.lang-toggle {
  background: var(--color-glass);
  border: 1px solid var(--color-glass-border);
  border-radius: 2rem;
  color: var(--color-accent);
  padding: 0.4rem 1rem;
  font-size: 1.2rem;
  cursor: pointer;
  margin-left: 1.5rem;
  transition: background 0.2s;
}
.lang-toggle:focus {
  outline: 2px solid var(--color-accent);
}

main {
  min-height: 100vh;
}
.section {
  padding: clamp(2rem, 6vw, 7rem) 0;
}
.hero {
  position: relative;
  overflow: hidden;
  min-height: 70vh;
  display: flex;
  align-items: center;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: radial-gradient(ellipse at 60% 30%, #1e90ff1a 0%, transparent 80%), url('../img/bg-tech.png') center/cover no-repeat;
  will-change: transform;
  transition: background-position 0.4s;
}
.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  align-items: flex-start;
  padding-top: 3rem;
  padding-bottom: 3rem;
}
.hero h1 {
  font-size: clamp(2.5rem, 5vw, 5rem);
  font-weight: 700;
  margin: 0 0 1rem;
  color: var(--color-text);
  line-height: 1.1;
}
.job-title {
  font-size: clamp(1.2rem, 2vw, 2rem);
  font-weight: 400;
  color: var(--color-accent);
  margin-bottom: var(--gap);
}
.hero-cta {
  display: flex;
  gap: 2rem;
}
.btn {
  border: none;
  outline: none;
  font-size: 1rem;
  padding: 0.9em 2.2em;
  border-radius: var(--radius);
  font-weight: 700;
  cursor: pointer;
  transition: background 0.18s, color 0.18s, border 0.18s;
}
.btn-accent {
  background: var(--color-accent);
  color: #fff;
  box-shadow: var(--shadow);
}
.btn-accent:hover {
  background: #237bce;
}
.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}
.btn-outline:hover {
  background: var(--color-accent-soft);
}

.about-wrap {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: var(--gap);
  align-items: center;
}
.about h2 {
  margin-bottom: 1.5rem;
}
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  gap: 1.2rem;
}
.skill {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--color-glass);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius);
  padding: 1rem;
  min-width: 80px;
  min-height: 100px;
  box-shadow: var(--shadow);
}
.skill img {
  width: 34px;
  height: 34px;
  margin-bottom: 0.6rem;
  filter: grayscale(1) brightness(1.3) contrast(1.2);
}
.skill span {
  font-size: 1rem;
  color: var(--color-text);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap);
  margin-top: 2rem;
}
.service-card {
  background: var(--color-glass);
  border: 1.5px solid var(--color-glass-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem 1.5rem;
  min-height: 180px;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  transition: transform 0.2s;
}
.service-card:hover {
  transform: translateY(-6px) scale(1.02);
  border-color: var(--color-accent);
}

.tech-stack .stack-list {
  display: flex;
  gap: 1.6rem;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
}
.tech-stack li {
  background: var(--color-glass);
  border-radius: var(--radius);
  padding: 0.7em 1.6em;
  font-weight: 600;
  font-size: 1.1rem;
  border: 1.5px solid var(--color-glass-border);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(330px, 1fr));
  gap: var(--gap);
  margin-top: 2.5rem;
}
.portfolio-card {
  background: none;
  border: none;
  perspective: 1200px;
  height: 340px;
  border-radius: var(--radius);
}
.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.8s cubic-bezier(.15,1.2,.8,1);
  transform-style: preserve-3d;
  border-radius: var(--radius);
  cursor: pointer;
}
.portfolio-card:hover .card-inner,
.portfolio-card:focus-within .card-inner {
  transform: rotateY(180deg);
}
.card-front,
.card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  background: var(--color-glass);
  border: 1.5px solid var(--color-glass-border);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2rem 1.5rem;
  overflow: hidden;
}
.card-front img {
  width: 90%;
  max-height: 160px;
  object-fit: contain;
  border-radius: 1rem;
  margin-bottom: 1.1rem;
  box-shadow: 0 2px 20px 0 #1e90ff18;
}
.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 0.3rem;
  text-align: center;
}
.card-back {
  transform: rotateY(180deg);
  justify-content: center;
  align-items: center;
  color: var(--color-text);
}
.card-desc {
  text-align: center;
  font-size: 1rem;
  opacity: 0.9;
}

.contact-grid {
  display: grid;
  grid-template-columns: 2fr 2fr;
  gap: var(--gap);
  align-items: flex-start;
}
.contact-details {
  background: var(--color-glass);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius);
  padding: 2rem;
  font-size: 1.05rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.contact-details a {
  color: var(--color-accent);
  text-decoration: none;
}
form#contactForm {
  background: var(--color-glass);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 1.3rem;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
input, textarea {
  background: #17191e;
  color: var(--color-text);
  border: 1.5px solid #222433;
  border-radius: 1rem;
  padding: 0.8em 1em;
  font-family: inherit;
  font-size: 1rem;
  resize: none;
  transition: border 0.18s;
}
input:focus, textarea:focus {
  border-color: var(--color-accent);
  outline: none;
}
.form-status {
  font-size: 1rem;
  margin-top: 0.7rem;
  min-height: 1.3em;
  color: var(--color-accent);
}
button[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
}

footer.footer {
  padding: 2.5rem 0 1rem;
  text-align: center;
  color: #6b7c92;
  font-size: 1.1rem;
  background: none;
}

/* Responsive */
@media (max-width: 880px) {
  .about-wrap, .contact-grid {
    grid-template-columns: 1fr;
  }
  .skills-grid, .services-grid, .portfolio-grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 600px) {
  .container {
    padding: 0 0.7rem;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .section {
    padding: 2rem 0;
  }
}

/* Glass & Frosted effect */
.skill,
.service-card,
.card-front, .card-back,
.contact-details, form#contactForm, .tech-stack li {
  backdrop-filter: blur(8px) saturate(1.1);
}

/* Scrollbar for dark mode */
::-webkit-scrollbar {
  width: 10px;
  background: #121319;
}
::-webkit-scrollbar-thumb {
  background: #25262c;
  border-radius: 8px;
}