:root {
    color-scheme: dark;
    --color-bg: #06080c;
    --color-bg-mid: #0c1017;
    --color-surface: #111820;
    --color-surface-raised: #161f2c;
    --color-text: #f1f5f9;
    --color-muted: #8b9cb3;
    --color-accent-blue: #38bdf8;
    --color-accent-blue-muted: #0ea5e9;
    --color-accent-blue-hover: #7dd3fc;
    --color-accent-purple: #c084fc;
    --color-accent-purple-muted: #a855f7;
    --color-accent-purple-hover: #d8b4fe;
    --color-accent: var(--color-accent-blue);
    --color-accent-hover: var(--color-accent-blue-hover);
    --color-accent-soft: rgba(56, 189, 248, 0.14);
    --color-purple-soft: rgba(192, 132, 252, 0.12);
    --color-border: rgba(148, 163, 184, 0.12);
    --color-border-glow: rgba(56, 189, 248, 0.25);
    --font: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    --radius: 12px;
    --shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.35),
      0 0 0 1px rgba(148, 163, 184, 0.06);
    --focus: 2px solid var(--color-accent-purple);
    --focus-offset: 2px;
  }
  
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }
  
  html {
    scroll-behavior: smooth;
    min-height: 100%;
  }
  
  @media (prefers-reduced-motion: reduce) {
    html {
      scroll-behavior: auto;
    }
  }
  
  body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: var(--font);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    background-image: radial-gradient(
        ellipse 100% 60% at 50% -30%,
        rgba(56, 189, 248, 0.09),
        transparent 50%
      ),
      radial-gradient(
        ellipse 70% 50% at 100% 0%,
        rgba(192, 132, 252, 0.06),
        transparent 45%
      );
    background-attachment: fixed;
  }

  .page-main {
    flex: 1;
    display: flex;
    flex-direction: column;
  }

  .page-section {
    flex: 1;
    display: flex;
    align-items: center;
  }
  
  .skip-link {
    position: absolute;
    left: -9999px;
    top: 0.75rem;
    z-index: 100;
    padding: 0.5rem 1rem;
    background: var(--color-surface-raised);
    color: var(--color-accent-blue);
    font-weight: 600;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--color-border);
  }
  
  .skip-link:focus {
    left: 0.75rem;
    outline: var(--focus);
    outline-offset: var(--focus-offset);
  }
  
  a {
    color: var(--color-accent-blue);
  }
  
  a:hover {
    color: var(--color-accent-purple-hover);
  }
  
  a:focus-visible {
    outline: var(--focus);
    outline-offset: var(--focus-offset);
    border-radius: 2px;
  }
  
  .site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(6, 8, 12, 0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--color-border);
  }
  
  .header-inner {
    position: relative;
    max-width: 72rem;
    margin: 0 auto;
    padding: 0.875rem clamp(1rem, 4vw, 1.5rem);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
  }
  
  .logo {
    font-weight: 700;
    font-size: clamp(0.95rem, 2.5vw, 1.05rem);
    text-decoration: none;
    color: var(--color-text);
  }
  
  .logo:hover {
    color: var(--color-accent-blue);
  }
  
  .nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: var(--radius);
  }
  
  .nav-toggle:focus-visible {
    outline: var(--focus);
    outline-offset: var(--focus-offset);
  }
  
  .nav-toggle-bar {
    display: block;
    height: 2px;
    width: 100%;
    background: var(--color-text);
    border-radius: 1px;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }
  
  .header-inner.menu-open .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  
  .header-inner.menu-open .nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }
  
  .header-inner.menu-open .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
  
  @media (min-width: 768px) {
    .nav-toggle {
      display: none;
    }
  }
  
  .site-nav .nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  .site-nav a.active {
    color: var(--color-accent-blue);
    text-decoration: underline;
    text-underline-offset: 0.35rem;
  }
  
  @media (max-width: 767px) {
    .site-nav {
      position: absolute;
      top: 100%;
      left: 0;
      right: 0;
      background: var(--color-surface-raised);
      border-bottom: 1px solid var(--color-border);
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    }
  
    .site-nav.is-open {
      max-height: 20rem;
    }
  
    .site-nav .nav-list {
      padding: 0.5rem 1rem 1rem;
      display: flex;
      flex-direction: column;
      gap: 0.25rem;
    }
  
    .site-nav a {
      display: block;
      padding: 0.6rem 0.5rem;
      text-decoration: none;
      font-weight: 600;
      color: var(--color-text);
    }
  }
  
  @media (min-width: 768px) {
    .site-nav {
      position: static;
      max-height: none;
      overflow: visible;
      background: transparent;
      border: none;
      box-shadow: none;
    }
  
    .site-nav .nav-list {
      display: flex;
      flex-wrap: wrap;
      gap: 0.25rem 1.25rem;
      align-items: center;
    }
  
    .site-nav a {
      text-decoration: none;
      font-weight: 600;
      font-size: 0.9375rem;
      color: var(--color-muted);
      padding: 0.35rem 0;
    }
  
    .site-nav a:hover {
      color: var(--color-accent-blue);
    }

  }
  
  .hero {
    padding: clamp(3rem, 10vw, 5rem) 1rem;
    background: radial-gradient(
        ellipse 85% 55% at 50% 0%,
        rgba(56, 189, 248, 0.12),
        transparent 55%
      ),
      radial-gradient(
        ellipse 50% 40% at 80% 60%,
        rgba(192, 132, 252, 0.1),
        transparent 50%
      ),
      linear-gradient(
        175deg,
        var(--color-surface-raised) 0%,
        var(--color-bg-mid) 50%,
        var(--color-bg) 100%
      );
    border-bottom: 1px solid var(--color-border);
  }
  
  .hero-inner {
    max-width: 42rem;
    margin: 0 auto;
    text-align: center;
  }
  
  .hero-label {
    margin: 0 0 0.5rem;
    font-size: 0.8125rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-accent-purple);
  }
  
  .hero h1 {
    margin: 0 0 1rem;
    font-size: clamp(1.85rem, 5vw, 2.5rem);
    line-height: 1.15;
    font-weight: 800;
    color: var(--color-text);
    text-shadow: 0 0 40px rgba(56, 189, 248, 0.15);
  }
  
  .hero-lead {
    margin: 0 0 1.75rem;
    font-size: clamp(1rem, 2.5vw, 1.125rem);
    color: var(--color-muted);
    max-width: 36rem;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
  }
  
  .btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    border-radius: var(--radius);
    border: 2px solid transparent;
    transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease;
  }
  
  .btn:focus-visible {
    outline: var(--focus);
    outline-offset: var(--focus-offset);
  }
  
  .btn-primary {
    background: linear-gradient(
      135deg,
      var(--color-accent-blue-muted) 0%,
      var(--color-accent-purple-muted) 100%
    );
    color: #fff;
    box-shadow: 0 4px 20px rgba(56, 189, 248, 0.25),
      0 4px 24px rgba(168, 85, 247, 0.2);
  }
  
  .btn-primary:hover {
    background: linear-gradient(
      135deg,
      var(--color-accent-blue) 0%,
      var(--color-accent-purple) 100%
    );
    color: #fff;
    filter: brightness(1.05);
    box-shadow: 0 6px 28px rgba(56, 189, 248, 0.35),
      0 6px 28px rgba(168, 85, 247, 0.25);
  }
  
  .btn-primary:active {
    transform: scale(0.98);
  }

  .btn-outline {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border-glow);
  }

  .btn-outline:hover {
    color: var(--color-accent-blue);
    border-color: var(--color-accent-blue);
    box-shadow: 0 4px 24px rgba(56, 189, 248, 0.15);
  }

  .connect-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
  }

  .connect-icon {
    width: 1.1rem;
    height: 1.1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .connect-icon svg {
    width: 100%;
    height: 100%;
    fill: currentColor;
  }

  .section {
    padding: clamp(2.5rem, 6vw, 4rem) 1rem;
  }
  
  .about,
  .skills {
    background: var(--color-surface);
  }
  
  .services,
  .contact {
    background: var(--color-bg-mid);
  }
  
  .section-inner {
    max-width: 48rem;
    margin: 0 auto;
  }
  
  .section h2 {
    margin: 0 0 0.75rem;
    font-size: clamp(1.35rem, 3vw, 1.65rem);
    font-weight: 800;
    color: var(--color-text);
  }
  
  .section-intro {
    margin: 0 0 1.75rem;
    color: var(--color-muted);
    max-width: 40rem;
  }
  
  .about-body p {
    margin: 0 0 1rem;
    color: var(--color-text);
  }
  
  .about-list {
    margin: 0;
    padding-left: 1.25rem;
    color: var(--color-text);
  }
  
  .about-list li {
    margin-bottom: 0.5rem;
  }
  
  .about-list li::marker {
    color: var(--color-accent-blue);
  }
  
  .service-grid {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 1rem;
    grid-template-columns: 1fr;
  }
  
  @media (min-width: 560px) {
    .service-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }
  
  .service-card {
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem 1.35rem;
    box-shadow: var(--shadow-card);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
  }
  
  .service-card:hover {
    border-color: rgba(56, 189, 248, 0.22);
    box-shadow: var(--shadow-card), 0 0 0 1px rgba(192, 132, 252, 0.12);
  }
  
  .service-card h3 {
    margin: 0 0 0.5rem;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-text);
  }
  
  .service-card p {
    margin: 0;
    font-size: 0.9375rem;
    color: var(--color-muted);
  }
  
  .skill-groups {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 1rem;
    grid-template-columns: 1fr;
  }
  
  @media (min-width: 480px) {
    .skill-groups {
      grid-template-columns: repeat(2, 1fr);
    }
  }
  
  .skill-group {
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.15rem 1.25rem;
  }
  
  .skill-group h3 {
    margin: 0 0 0.65rem;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-accent-purple);
  }
  
  .skill-group ul {
    margin: 0;
    padding-left: 1.1rem;
    color: var(--color-text);
    font-size: 0.9375rem;
  }
  
  .skill-group li {
    margin-bottom: 0.35rem;
  }
  
  .skill-group li::marker {
    color: var(--color-accent-blue-muted);
  }
  
  .contact {
    border-top: 1px solid var(--color-border);
  }
  
  .contact-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1.25rem;
  }
  
  .contact-list a {
    font-weight: 700;
    text-decoration: none;
  }

  .contact-logo-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
  }

  .contact-logo {
    width: 1.1rem;
    height: 1.1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .contact-logo svg {
    width: 100%;
    height: 100%;
    fill: currentColor;
  }
  
  .contact-list a:hover {
    text-decoration: underline;
    color: var(--color-accent-purple-hover);
  }
  
  .site-footer {
    padding: 1.25rem 1rem;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
  }
  
  .site-footer p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--color-muted);
    text-align: center;
  }

  .lang-switch {
    font-weight: 700;
    opacity: 0.95;
  }

  [dir="rtl"] {
    font-family: "Segoe UI", Tahoma, Arial, sans-serif;
  }

  [dir="rtl"] .skip-link {
    left: auto;
    right: -9999px;
  }

  [dir="rtl"] .skip-link:focus {
    right: 0.75rem;
    left: auto;
  }

  [dir="rtl"] .about-list {
    padding-right: 1.25rem;
    padding-left: 0;
  }

  [dir="rtl"] .skill-group ul {
    padding-right: 1.1rem;
    padding-left: 0;
  }

  [dir="rtl"] .hero-inner,
  [dir="rtl"] .section-inner {
    text-align: center;
  }

  [dir="rtl"] .about-body {
    text-align: right;
  }

  [dir="rtl"] .bio-preview {
    text-align: right;
  }