:root {
    --bg: #0E1116;
    --panel: #151A21;
    --panel-2: #1B222B;
    --ink: #E8EAED;
    --ink-soft: #8A93A0;
    --line: #262E38;
    --accent: #F5A623;
    --accent-soft: rgba(245, 166, 35, 0.12);
    --accent-soft-strong: rgba(245, 166, 35, 0.24);
    --accent-2: #4FA8FF;
    --accent-2-soft: rgba(79, 168, 255, 0.13);

    --font-display: 'Manrope', 'Segoe UI', sans-serif;
    --font-body: 'Work Sans', 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

    --sidebar-w: 300px;
  }

  * { box-sizing: border-box; }
  html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

  body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
  }

  a { color: var(--accent); text-decoration: none; }
  a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

  .layout {
    display: flex;
    align-items: flex-start;
    min-height: 100vh;
  }

  /* ---------- Sidebar ---------- */

  .sidebar {
    position: sticky;
    top: 0;
    width: var(--sidebar-w);
    flex-shrink: 0;
    height: 100vh;
    overflow-y: auto;
    background: var(--panel);
    border-right: 1px solid var(--line);
    padding: 2.25rem 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
  }

  .lang-switch {
    position: fixed;
    top: 1.25rem;
    right: 1.5rem;
    z-index: 20;
    display: flex;
    gap: 0.4rem;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 0.3rem;
  }
  .lang-btn {
    display: flex; align-items: center; justify-content: center;
    width: 30px; height: 21px; padding: 0;
    border: 1.5px solid var(--line); border-radius: 4px;
    background: var(--panel-2); cursor: pointer;
    opacity: 0.55; transition: opacity 0.15s ease, border-color 0.15s ease;
  }
  .lang-btn svg { width: 100%; height: 100%; border-radius: 2px; display: block; }
  .lang-btn:hover { opacity: 0.85; }
  .lang-btn.active { opacity: 1; border-color: var(--accent); }

  .avatar-block { display: flex; align-items: center; gap: 0.9rem; }
  .avatar {
    width: 58px; height: 58px; border-radius: 10px; object-fit: cover;
    box-shadow: 0 0 0 1px var(--line);
  }
  .identity .name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.15rem;
    line-height: 1.2;
    margin: 0 0 0.3rem;
  }
  .identity .role {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--accent);
    letter-spacing: 0.02em;
  }

  .prompt-line {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--ink-soft);
    background: var(--panel-2);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 0.7rem 0.85rem;
    line-height: 1.6;
  }
  .prompt-line .p { color: var(--accent-2); }
  .prompt-line .cursor {
    display: inline-block; width: 6px; height: 1em; background: var(--accent);
    vertical-align: text-bottom; margin-left: 2px;
    animation: blink 1.1s steps(1) infinite;
  }
  @keyframes blink { 50% { opacity: 0; } }

  .btn-cv {
    display: inline-flex; align-self: flex-start; align-items: center; gap: 0.3rem;
    font-family: var(--font-mono); font-size: 0.68rem; color: var(--accent);
    border: 1px solid var(--accent-soft-strong); background: var(--accent-soft);
    border-radius: 4px; padding: 0.32rem 0.5rem;
    text-decoration: none; transition: background 0.15s ease, border-color 0.15s ease;
  }
  .btn-cv:hover { background: var(--accent-soft-strong); border-color: var(--accent); }
  .btn-cv svg { width: 10px; height: 10px; }

  .side-contact { display: flex; flex-direction: column; gap: 0.5rem; }
  .side-contact a, .side-contact span {
    display: flex; align-items: center; gap: 0.55rem;
    font-size: 0.85rem; color: var(--ink-soft);
  }
  .side-contact a:hover { color: var(--accent); }
  .side-contact svg { width: 15px; height: 15px; flex-shrink: 0; opacity: 0.85; }

  .side-nav { display: flex; flex-direction: column; gap: 0.15rem; margin-top: auto; padding-top: 1rem; border-top: 1px solid var(--line); }
  .side-nav a {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--ink-soft);
    padding: 0.45rem 0.5rem;
    border-radius: 5px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  .side-nav a:hover { color: var(--ink); background: var(--panel-2); }
  .side-nav a::before { content: "//"; color: var(--accent); opacity: 0.7; }

  /* ---------- Main content ---------- */

  .main { flex: 1; min-width: 0; max-width: 900px; padding: 3rem 3rem 5rem; }

  .hero-line {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--accent-2);
    margin: 0 0 0.9rem;
  }

  .headline {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: clamp(1.8rem, 3.4vw, 2.5rem);
    line-height: 1.25;
    letter-spacing: -0.01em;
    margin: 0 0 1.5rem;
    max-width: 34ch;
    text-wrap: balance;
  }
  .headline .accent { color: var(--accent); }

  section { padding: 3.25rem 0; border-top: 1px solid var(--line); scroll-margin-top: 2rem; }
  section:first-of-type { border-top: none; padding-top: 0; }

  .sec-head {
    display: flex;
    align-items: baseline;
    gap: 0.7rem;
    margin: 0 0 1.75rem;
  }
  .sec-tag { font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent); }
  .sec-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.35rem;
    margin: 0;
    color: var(--ink);
  }

  .summary-text { font-size: 1.05rem; color: var(--ink-soft); max-width: 66ch; margin: 0; }

  /* ---------- Timeline (experience / education) ---------- */

  .timeline { position: relative; display: flex; flex-direction: column; gap: 2.1rem; }
  .timeline::before {
    content: "";
    position: absolute;
    left: 20px;
    top: 6px;
    bottom: 6px;
    width: 1px;
    background: var(--line);
  }

  .t-item { position: relative; padding-left: 3.25rem; }

  .t-mark {
    position: absolute;
    left: 0;
    top: 0;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: #FFFFFF;
    border: 1px solid var(--line);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6px;
    z-index: 1;
  }
  .t-mark img { width: 100%; height: 100%; object-fit: contain; }
  .t-mark.dot::after {
    content: "";
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--accent);
  }
  .timeline .t-item:nth-child(2n) .t-mark.dot::after { background: var(--accent-2); }

  .t-org { font-weight: 600; font-size: 0.98rem; color: var(--ink); margin: 0 0 0.15rem; }
  .t-meta {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    color: var(--ink-soft);
    margin: 0 0 0.9rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0 0.6rem;
  }
  .t-role { font-weight: 600; font-size: 1.02rem; color: var(--ink); margin: 0 0 0.7rem; }
  .t-role .current {
    display: inline-block; margin-left: 0.5rem;
    font-family: var(--font-mono); font-size: 0.65rem;
    letter-spacing: 0.06em; text-transform: uppercase;
    color: var(--accent); background: var(--accent-soft);
    padding: 0.15rem 0.45rem; border-radius: 3px; vertical-align: middle;
  }
  .t-item ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.55rem; }
  .t-item li { position: relative; padding-left: 1.1rem; color: var(--ink-soft); font-size: 0.95rem; }
  .t-item li::before { content: "›"; position: absolute; left: 0; color: var(--accent-2); font-family: var(--font-mono); }
  .t-note { font-size: 0.88rem; color: var(--ink-soft); margin: 0.7rem 0 0; max-width: 60ch; }

  /* ---------- Skills ---------- */

  .skills-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem 2rem; }
  .skill-group { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 1.1rem 1.2rem; }
  .skill-group h3 {
    font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.05em;
    text-transform: uppercase; color: var(--ink-soft); font-weight: 500; margin: 0 0 0.8rem;
  }
  .tag-row { display: flex; flex-wrap: wrap; gap: 0.45rem; }
  .tag {
    font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent);
    border: 1px solid var(--accent-soft-strong); background: var(--accent-soft);
    padding: 0.3rem 0.55rem; border-radius: 4px; white-space: nowrap;
  }
  .skills-grid .skill-group:nth-child(2n) .tag {
    color: var(--accent-2); border-color: rgba(79,168,255,0.3); background: var(--accent-2-soft);
  }

  /* ---------- Projects ---------- */

  .projects-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 1.1rem; }
  .project-card {
    display: flex; flex-direction: column; gap: 0.85rem;
    background: var(--panel); border: 1px solid var(--line); border-radius: 8px;
    padding: 1.2rem 1.3rem; border-top: 3px solid var(--accent);
  }
  .project-head { display: flex; align-items: center; gap: 0.55rem; }
  .project-icon { color: var(--ink-soft); flex-shrink: 0; }
  .project-name { font-family: var(--font-mono); font-weight: 600; font-size: 0.92rem; color: var(--ink); }
  .project-desc { font-size: 0.9rem; color: var(--ink-soft); line-height: 1.55; margin: 0; flex: 1; }
  .project-foot { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; }
  .project-lang { display: inline-flex; align-items: center; gap: 0.4rem; font-family: var(--font-mono); font-size: 0.74rem; color: var(--ink-soft); }
  .project-lang-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }

  .btn-link {
    display: inline-flex; align-items: center; gap: 0.35rem;
    font-family: var(--font-mono); font-size: 0.76rem; color: var(--accent);
    border: 1px solid var(--accent-soft-strong); background: var(--accent-soft);
    padding: 0.45rem 0.7rem; border-radius: 5px; text-decoration: none;
    transition: background 0.15s ease, border-color 0.15s ease;
  }
  .btn-link:hover { background: var(--accent-soft-strong); border-color: var(--accent); }
  .btn-link svg { width: 12px; height: 12px; }

  /* ---------- Certifications & languages ---------- */

  .cert-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.1rem; margin-bottom: 2rem; }
  .cert-card {
    display: flex; align-items: center; gap: 1rem;
    background: var(--panel); border: 1px solid var(--line); border-radius: 8px;
    padding: 1.1rem 1.2rem;
  }
  .cert-icon { width: 56px; height: 56px; object-fit: contain; flex-shrink: 0; }
  .cert-title { font-weight: 600; font-size: 0.92rem; color: var(--ink); margin: 0 0 0.2rem; }
  .cert-issuer { font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-soft); margin: 0 0 0.6rem; }

  .lang-row { display: flex; gap: 1.5rem; flex-wrap: wrap; }
  .lang-item { display: flex; align-items: center; gap: 0.7rem; }
  .lang-badge {
    width: 30px; height: 30px; border-radius: 6px; background: var(--panel-2);
    border: 1px solid var(--line); color: var(--ink-soft);
    font-family: var(--font-mono); font-size: 0.66rem; font-weight: 600;
    display: flex; align-items: center; justify-content: center;
  }
  .lang-item .k { font-size: 0.92rem; color: var(--ink); }
  .lang-item .v { font-family: var(--font-mono); font-size: 0.74rem; color: var(--ink-soft); }

  /* ---------- Footer ---------- */

  footer.main-footer {
    border-top: 1px solid var(--line);
    margin-top: 1rem;
    padding-top: 2rem;
    display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 0.75rem;
    font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-soft);
  }
  footer.main-footer a { color: var(--ink-soft); }
  footer.main-footer a:hover { color: var(--accent); }

  /* ---------- Responsive ---------- */

  @media (max-width: 900px) {
    .layout { flex-direction: column; }
    .sidebar {
      position: relative; width: 100%; height: auto;
      flex-direction: row; flex-wrap: wrap; align-items: center;
      gap: 1rem 1.5rem; padding: 1.25rem 1.5rem;
    }
    .prompt-line, .side-contact { display: none; }
    .side-nav { display: none; }
    .main { padding: 2.25rem 1.5rem 4rem; max-width: 100%; }
  }

  @media (max-width: 640px) {
    .skills-grid { grid-template-columns: 1fr; }
    .cert-card { flex-wrap: wrap; }
  }

  @media (prefers-reduced-motion: reduce) {
    * { animation: none !important; transition: none !important; }
    html { scroll-behavior: auto; }
  }