/* ---------- Color variables (Light Mode Default) ---------- */
  :root {
      --bg: #f7f8ff;
      --card: #ffffff;
      --muted: #6b7280;
      --text: #0f1724;
      --accent: #6366f1;
      --accent-2: #8b5cf6;
      --accent-3: #60a5fa;
      --glass: rgba(99, 102, 241, 0.08);
      --maxw: 1100px;
      font-family: 'Poppins', Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
      transition: all 0.5s ease-in-out;
  }

  /* ---------- Dark Mode ---------- */
  body.dark {
      --bg: #0b1120;
      --card: #111827;
      --muted: #94a3b8;
      --text: #e2e8f0;
      --accent: #818cf8;
      --accent-2: #a78bfa;
      --accent-3: #38bdf8;
      --glass: rgba(129, 140, 248, 0.12);
      background: radial-gradient(800px 400px at 20% 20%, rgba(99, 102, 241, 0.12), transparent 60%),
          radial-gradient(800px 400px at 80% 90%, rgba(139, 92, 246, 0.10), transparent 60%),
          var(--bg);
      color: var(--text);
      transition: all 0.5s ease-in-out;
  }


  * {
      box-sizing: border-box;
      margin: 0;
      padding: 0
  }

  html,
  body {
      height: 100%
  }

  body {
      background: radial-gradient(1200px 600px at -10% 10%, rgba(139, 92, 246, 0.07), transparent 12%),
          radial-gradient(1000px 500px at 110% 90%, rgba(96, 165, 250, 0.04), transparent 12%),
          var(--bg);
      color: var(--text);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      line-height: 1.5;
      padding: 28px 20px;
  }

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

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

  .container {
      max-width: var(--maxw);
      margin: 0 auto
  }

  /* ---------- Header ---------- */
  header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 12px 0;
      position: relative
  }

  .brand {
      display: flex;
      align-items: center;
      gap: 12px
  }

  .logo {
      width: 56px;
      height: 56px;
      border-radius: 12px;
      background: linear-gradient(135deg, var(--accent), var(--accent-2));
      display: grid;
      place-items: center;
      font-weight: 800;
      color: white;
      font-size: 1.05rem;
      box-shadow: 0 10px 30px rgba(99, 102, 241, 0.12);
  }

  nav ul {
      display: flex;
      gap: 14px;
      list-style: none
  }

  nav a {
      padding: 8px 12px;
      border-radius: 10px;
      color: var(--muted);
      font-weight: 600
  }

  nav a:hover {
      color: var(--accent);
      background: var(--glass);
      transform: translateY(-2px);
      transition: all .2s
  }

  /* hamburger mobile */
  .hamburger {
      display: none
  }

  @media (max-width:860px) {
      nav {
          display: none
      }

      .hamburger {
          display: block;
          background: transparent;
          border: 0;
          font-size: 1.4rem;
          cursor: pointer
      }
  }

  a {
      color: inherit;
      text-decoration: none;
      display: flex;
      margin-bottom: 2rem;
  }

  /* ---------- Hero ---------- */
  .hero {
      display: grid;
      grid-template-columns: 1fr 320px;
      gap: 28px;
      align-items: center;
      padding: 36px 0;
  }

  .intro h1 {
      font-size: 2.4rem;
      line-height: 1.05;
      margin-bottom: 8px
  }

  .intro .sub {
      color: var(--muted);
      margin-bottom: 16px;
      font-size: 1.02rem
  }

  .hero p.lead {
      color: var(--muted);
      margin-bottom: 18px;
      white-space: pre-line
  }

  .btn-row {
      display: flex;
      gap: 12px;
      flex-wrap: wrap
  }

  .btn {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 10px 16px;
      border-radius: 12px;
      cursor: pointer;
      font-weight: 700;
      color: white;
      border: 0;
      background: linear-gradient(90deg, var(--accent), var(--accent-2));
      box-shadow: 0 12px 30px rgba(99, 102, 241, 0.12);
      transition: transform .18s, box-shadow .18s;
  }

  .btn:hover {
      transform: translateY(-4px);
      box-shadow: 0 18px 40px rgba(99, 102, 241, 0.16)
  }

  .btn.ghost {
      background: transparent;
      color: var(--accent);
      border: 1px solid rgba(99, 102, 241, 0.12);
      box-shadow: none;
  }

  .chip {
      display: inline-flex;
      gap: 8px;
      align-items: center;
      padding: 8px 12px;
      border-radius: 999px;
      background: rgba(99, 102, 241, 0.06);
      font-weight: 700;
      color: var(--muted)
  }

  /* profile card */
  .card {
      background: var(--card);
      padding: 18px;
      border-radius: 14px;
      border: 1px solid rgba(15, 23, 36, 0.04);
      box-shadow: 0 8px 30px rgba(15, 23, 36, 0.04)
  }

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

  .avatar {
      width: 120px;
      height: 120px;
      border-radius: 999px;
      background: linear-gradient(135deg, var(--accent-2), var(--accent-3));
      display: grid;
      place-items: center;
      font-weight: 900;
      color: white;
      font-size: 2rem;
      box-shadow: 0 12px 40px rgba(139, 92, 246, 0.12)
  }

  .muted {
      color: var(--muted);
      font-size: .95rem
  }

  /* ---------- Sections ---------- */
  section {
      padding: 36px 0;
      border-top: 1px solid rgba(15, 23, 36, 0.03)
  }

  h2.section-title {
      font-size: 1.25rem;
      margin-bottom: 12px;
      color: var(--accent)
  }

  p.lead {
      color: var(--muted);
      margin-bottom: 14px
  }

  /* Projects grid */
  .projects-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px
  }

  .project {
      padding: 18px;
      border-radius: 12px;
      /* background:linear-gradient(180deg, rgba(255,255,255,0.9), var(--card)); */
      border: 1px solid rgba(99, 102, 241, 0.06);
      color: var(--text);
      transition: transform .25s, box-shadow .25s;
  }

  .project:hover {
      transform: translateY(-8px);
      box-shadow: 0 20px 40px rgba(15, 79, 206, 0.06)
  }

  .project h3 {
      font-size: 1.05rem;
      margin-bottom: 8px;
      color: var(--accent-2)
  }

  .project p {
      color: var(--muted);
      font-size: .95rem;
      margin-bottom: 10px
  }

  .meta {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      font-size: .9rem;
      color: var(--muted)
  }

  @media(max-width:1100px) {
      .projects-grid {
          grid-template-columns: repeat(2, 1fr)
      }
  }

  @media(max-width:720px) {
      .hero {
          grid-template-columns: 1fr;
      }

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

  /* skills */
  .skills {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
      justify-content: center
  }

  .skill {
      padding: 8px 12px;
      border-radius: 999px;
      background: linear-gradient(90deg, rgba(99, 102, 241, 0.08), rgba(96, 165, 250, 0.04));
      font-weight: 700;
      color: var(--accent-2)
  }

  /* contact form */
  .grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px
  }

  @media(max-width:740px) {
      .grid-2 {
          grid-template-columns: 1fr
      }
  }

  input,
  textarea {
      width: 100%;
      padding: 12px;
      border-radius: 10px;
      border: 1px solid rgba(15, 23, 36, 0.05);
      background: transparent;
      color: var(--text);
      font-size: 1rem
  }

  textarea {
      min-height: 120px;
      resize: vertical
  }

  .muted-note {
      font-size: .9rem;
      color: var(--muted);
      margin-top: 8px
  }

  /* footer */
  footer {
      padding: 18px 0;
      color: var(--muted);
      text-align: center;
      font-size: .95rem;
      margin-top: 20px
  }

  /* modal */
  .modal {
      position: fixed;
      inset: 0;
      display: none;
      place-items: center;
      background: rgba(2, 6, 23, 0.45);
      z-index: 60
  }

  .modal.active {
      display: grid
  }

  .modal-card {
      width: 92%;
      max-width: 760px;
      background: var(--card);
      padding: 18px;
      border-radius: 12px;
      border: 1px solid rgba(15, 23, 36, 0.04)
  }

  .close-btn {
      background: transparent;
      border: 0;
      color: var(--muted);
      cursor: pointer;
      font-weight: 800
  }

  /* Reveal animations */
  .reveal {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity .6s ease, transform .6s ease
  }

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

  .fade-left {
      opacity: 0;
      transform: translateX(-18px);
      transition: opacity .6s ease, transform .6s ease
  }

  .fade-left.show {
      opacity: 1;
      transform: translateX(0)
  }

  .fade-right {
      opacity: 0;
      transform: translateX(18px);
      transition: opacity .6s ease, transform .6s ease
  }

  .fade-right.show {
      opacity: 1;
      transform: translateX(0)
  }

  /* ---------- Reset ---------- */
  * {
      box-sizing: border-box;
      margin: 0;
      padding: 0
  }

  html,
  body {
      height: 100%
  }

  body {
      background: radial-gradient(1200px 600px at -10% 10%, rgba(139, 92, 246, 0.07), transparent 12%),
          radial-gradient(1000px 500px at 110% 90%, rgba(96, 165, 250, 0.04), transparent 12%),
          var(--bg);
      color: var(--text);
      -webkit-font-smoothing: antialiased;
      line-height: 1.5;
      padding: 28px 20px;
      transition: background 0.5s ease, color 0.5s ease;
  }

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

  .container {
      max-width: var(--maxw);
      margin: 0 auto
  }

  /* ---------- Header ---------- */
  header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 12px 0;
      position: relative;
  }

  .brand {
      display: flex;
      align-items: center;
      gap: 12px
  }

  .logo {
      width: 56px;
      height: 56px;
      border-radius: 12px;
      background: linear-gradient(135deg, var(--accent), var(--accent-2));
      display: grid;
      place-items: center;
      font-weight: 800;
      color: white;
      font-size: 1.05rem;
      box-shadow: 0 10px 30px rgba(99, 102, 241, 0.12);
  }

  nav ul {
      display: flex;
      gap: 14px;
      list-style: none
  }

  nav a {
      padding: 8px 12px;
      border-radius: 10px;
      color: var(--muted);
      font-weight: 600
  }

  nav a:hover {
      color: var(--accent);
      background: var(--glass);
      transform: translateY(-2px);
      transition: all .2s
  }

  /* Toggle Button */
  .mode-toggle {
      background: var(--glass);
      border: none;
      border-radius: 50%;
      width: 42px;
      height: 42px;
      cursor: pointer;
      display: grid;
      place-items: center;
      font-size: 1.3rem;
      color: var(--accent-2);
      box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
      transition: transform 0.4s ease, background 0.4s ease, box-shadow 0.4s ease;
  }

  .mode-toggle:hover {
      transform: rotate(20deg) scale(1.1);
      box-shadow: 0 6px 20px rgba(139, 92, 246, 0.25);
  }

  @media (max-width:860px) {
      nav {
          display: none
      }

      .hamburger {
          display: block;
          background: transparent;
          border: 0;
          font-size: 1.4rem;
          cursor: pointer
      }
  }