/* ========== RESET & BASE STYLES ========== */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      margin: 0;
      background: #000;
      color: #fff;
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
      overflow-x: hidden;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      position: relative;
    }

    /* Dynamic Background Pattern Layer */
    body::before {
      content: '';
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
      opacity: 0.03;
      pointer-events: none;
      background-image: var(--bg-pattern);
      background-size: var(--bg-size);
      background-repeat: repeat;
      transition: background-image 0.5s ease;
    }

    /* Pattern definitions - rotated daily */
    body[data-pattern="1"]::before {
      --bg-pattern: repeating-linear-gradient(45deg, transparent, transparent 10px, rgba(255,255,255,0.05) 10px, rgba(255,255,255,0.05) 20px);
      --bg-size: 100% 100%;
    }

    body[data-pattern="2"]::before {
      --bg-pattern: radial-gradient(circle at 50% 50%, rgba(255,255,255,0.05) 1px, transparent 1px);
      --bg-size: 20px 20px;
    }

    body[data-pattern="3"]::before {
      --bg-pattern: repeating-linear-gradient(90deg, transparent, transparent 15px, rgba(255,255,255,0.05) 15px, rgba(255,255,255,0.05) 30px),
                     repeating-linear-gradient(0deg, transparent, transparent 15px, rgba(255,255,255,0.05) 15px, rgba(255,255,255,0.05) 30px);
      --bg-size: 100% 100%;
    }

    body[data-pattern="4"]::before {
      --bg-pattern: repeating-linear-gradient(-45deg, transparent, transparent 10px, rgba(255,255,255,0.05) 10px, rgba(255,255,255,0.05) 20px);
      --bg-size: 100% 100%;
    }

    body[data-pattern="5"]::before {
      --bg-pattern: radial-gradient(circle at 25% 25%, rgba(255,255,255,0.05) 2%, transparent 2%),
                     radial-gradient(circle at 75% 75%, rgba(255,255,255,0.05) 2%, transparent 2%);
      --bg-size: 40px 40px;
    }

    body[data-pattern="6"]::before {
      --bg-pattern: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255,255,255,0.05) 2px, rgba(255,255,255,0.05) 4px);
      --bg-size: 100% 100%;
    }

    body[data-pattern="7"]::before {
      --bg-pattern: conic-gradient(from 45deg at 50% 50%, transparent 0deg, rgba(255,255,255,0.05) 90deg, transparent 180deg, rgba(255,255,255,0.05) 270deg, transparent 360deg);
      --bg-size: 60px 60px;
    }

    ::selection {
      background: rgba(255, 255, 255, 0.2);
      color: #fff;
    }
    
    /* ========== HEADER STYLES ========== */
    header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.25rem 2.5rem;
      font-size: 0.875rem;
      z-index: 100;
      background: rgba(0, 0, 0, 0.3);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      transition: all 0.3s ease;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    
    header.scrolled {
      padding: 1rem 2.5rem;
      background: rgba(0, 0, 0, 0.5);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .logo { 
      font-size: 1rem; 
      font-weight: 700; 
      letter-spacing: 0.5px;
    }
    
    /* DateTime Display - Enhanced */
    .datetime-container {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      margin-left: 1.25rem;
      gap: 0.125rem;
    }

    .time { 
      font-size: 0.875rem;
      opacity: 0.9;
      font-variant-numeric: tabular-nums;
      font-weight: 600;
      letter-spacing: 0.5px;
    }

    .date {
      font-size: 0.6875rem;
      opacity: 0.7;
      font-variant-numeric: tabular-nums;
      letter-spacing: 0.3px;
    }


    .calendar-toggle:hover,
    .calendar-toggle:focus {
      background: rgba(255, 255, 255, 0.2);
      outline: none;
      transform: translateY(-1px);
    }

    .calendar-toggle:focus-visible {
      outline: 2px solid rgba(255, 255, 255, 0.5);
      outline-offset: 2px;
    }
    
    nav { 
      display: flex; 
      align-items: center;
      gap: 1.25rem;
    }
    
    nav a { 
      text-decoration: none; 
      color: #fff; 
      font-weight: 600; 
      font-size: 0.875rem;
      position: relative;
      transition: opacity 0.3s ease;
      padding: 0.25rem 0;
    }
    
    nav a:hover,
    nav a:focus {
      opacity: 0.7;
      outline: none;
    }
    
    nav a:focus-visible {
      outline: 2px solid rgba(255, 255, 255, 0.5);
      outline-offset: 4px;
      border-radius: 2px;
    }
    
    nav a:after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: #fff;
      transition: width 0.3s ease;
    }
    
    nav a:hover:after {
      width: 100%;
    }
    
    nav a:last-child { 
      border: 1px solid rgba(255, 255, 255, 0.5);
      padding: 0.375rem 0.875rem; 
      border-radius: 4px;
      transition: all 0.3s ease;
    }
    
    nav a:last-child:hover {
      background: #fff;
      color: #000;
      border-color: #fff;
    }
    
    nav a:last-child:after {
      display: none;
    }

    /* ========== CALENDAR MODAL ========== */
    .calendar-modal {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.85);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 1rem;
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.3s ease, visibility 0.3s ease;
    }

    .calendar-modal.active {
      opacity: 1;
      visibility: visible;
    }

    .calendar-container {
      background: rgba(17, 17, 17, 0.95);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: 16px;
      padding: 2rem;
      max-width: 400px;
      width: 100%;
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
      transform: scale(0.9);
      transition: transform 0.3s ease;
    }

    .calendar-modal.active .calendar-container {
      transform: scale(1);
    }

    .calendar-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 1.5rem;
      padding-bottom: 1rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .calendar-month-year {
      font-size: 1.25rem;
      font-weight: 700;
      letter-spacing: 0.5px;
    }

    .calendar-close {
      background: transparent;
      border: none;
      color: #fff;
      font-size: 1.5rem;
      cursor: pointer;
      opacity: 0.7;
      transition: all 0.3s ease;
      padding: 0.25rem;
      line-height: 1;
      width: 32px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 4px;
    }

    .calendar-close:hover,
    .calendar-close:focus {
      opacity: 1;
      background: rgba(255, 255, 255, 0.1);
      outline: none;
    }

    .calendar-weekdays {
      display: grid;
      grid-template-columns: repeat(7, 1fr);
      gap: 0.5rem;
      margin-bottom: 0.5rem;
    }

    .calendar-weekday {
      text-align: center;
      font-size: 0.75rem;
      font-weight: 600;
      opacity: 0.7;
      padding: 0.5rem 0;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .calendar-days {
      display: grid;
      grid-template-columns: repeat(7, 1fr);
      gap: 0.5rem;
    }

    .calendar-day {
      aspect-ratio: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 8px;
      font-size: 0.875rem;
      font-weight: 500;
      cursor: pointer;
      transition: all 0.2s ease;
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.05);
    }

    .calendar-day:hover {
      background: rgba(255, 255, 255, 0.1);
      transform: scale(1.05);
    }

    .calendar-day.other-month {
      opacity: 0.3;
    }

    .calendar-day.today {
      background: rgba(255, 255, 255, 0.15);
      border: 2px solid rgba(255, 255, 255, 0.5);
      font-weight: 700;
      color: #fff;
      box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
    }

    .calendar-day.selected {
      background: #fff;
      color: #000;
      font-weight: 700;
    }

    .calendar-today-info {
      margin-top: 1.5rem;
      padding-top: 1.5rem;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      text-align: center;
    }

    .calendar-today-label {
      font-size: 0.75rem;
      opacity: 0.7;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 0.5rem;
    }

    .calendar-today-date {
      font-size: 1rem;
      font-weight: 600;
      letter-spacing: 0.5px;
    }
    
    /* ========== HERO SECTION ========== */
    .hero { 
      min-height: 100vh; 
      display: flex; 
      flex-direction: column;
      align-items: center; 
      justify-content: center; 
      position: relative; 
      z-index: 2; 
      text-align: center;
      padding: 6rem 1.25rem 4rem;
    }
    
    .hero h1 { 
      font-size: clamp(3rem, 10vw, 8rem);
      text-transform: uppercase; 
      margin: 0 0 2rem; 
      font-weight: 900;
      letter-spacing: 0.05em;
      line-height: 1;
    }
    
    .hero .quote { 
      font-size: clamp(0.875rem, 2vw, 1rem);
      line-height: 1.6; 
      opacity: 0.85; 
      max-width: 28rem;
      margin-bottom: 2.5rem;
      letter-spacing: 0.02em;
    }
    
    .hero .tagline { 
      font-size: clamp(1.5rem, 4vw, 2.5rem);
      text-transform: uppercase; 
      font-weight: 700;
      margin-bottom: 2.5rem;
      letter-spacing: 0.03em;
      opacity: 0.95;
    }
    
    .hero-cta { 
      display: flex; 
      gap: 1rem; 
      flex-wrap: wrap;
      justify-content: center;
    }
    
    .cta-btn { 
      background: #fff; 
      color: #000; 
      text-transform: uppercase; 
      font-weight: 700; 
      font-size: 0.875rem;
      padding: 0.875rem 1.75rem; 
      border-radius: 4px; 
      transition: all 0.3s ease; 
      text-decoration: none; 
      border: 2px solid #fff;
      display: inline-block;
      letter-spacing: 0.5px;
    }
    
    .cta-btn:hover,
    .cta-btn:focus { 
      background: transparent; 
      color: #fff; 
      transform: translateY(-3px);
      box-shadow: 0 8px 20px rgba(255, 255, 255, 0.15);
      outline: none;
    }

    .cta-btn:focus-visible {
      outline: 2px solid rgba(255, 255, 255, 0.5);
      outline-offset: 4px;
    }
    
    /* ========== PROGRESS INDICATOR ========== */
    #progress { 
      position: fixed; 
      bottom: 1.25rem; 
      right: 2.5rem; 
      font-size: 0.75rem; 
      opacity: 0.6; 
      z-index: 100; 
      background: rgba(0, 0, 0, 0.8);
      padding: 0.5rem 0.875rem;
      border-radius: 20px;
      transition: opacity 0.3s ease;
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.1);
      font-variant-numeric: tabular-nums;
    }
    
    #progress:hover {
      opacity: 1;
    }
    
    /* ========== MAIN CONTENT SECTIONS ========== */
    main section { 
      min-height: 100vh; 
      padding: 6rem 3.75rem; 
      position: relative; 
      z-index: 2; 
      display: flex;
      flex-direction: column;
      justify-content: center;
      max-width: 1400px;
      margin: 0 auto;
    }
    
    section h2 { 
      font-size: clamp(2rem, 5vw, 3rem);
      margin-bottom: 3rem; 
      position: relative;
      display: inline-block;
      font-weight: 700;
      letter-spacing: 0.02em;
    }
    
    section h2:after {
      content: '';
      position: absolute;
      bottom: -0.75rem;
      left: 0;
      width: 4rem;
      height: 3px;
      background: #fff;
    }
    
    /* ========== ABOUT SECTION ========== */
    #about p {
      font-size: clamp(1rem, 2vw, 1.25rem);
      max-width: 50rem;
      line-height: 1.8;
      margin-bottom: 2rem;
      opacity: 0.9;
    }
    
    .skills-container {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
      gap: 2.5rem;
      margin-top: 3rem;
    }
    
    .skill-category {
      min-width: 0;
    }
    
    .skill-category h3 {
      margin-bottom: 1.25rem;
      opacity: 0.95;
      font-size: 1.25rem;
      font-weight: 600;
    }
    
    .skills ul { 
      display: flex; 
      flex-direction: column;
      gap: 0.75rem; 
      list-style: none; 
    }
    
    .skills li { 
      background: rgba(17, 17, 17, 0.6);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      padding: 0.75rem 1rem; 
      border-radius: 6px; 
      transition: all 0.3s ease;
      border-left: 3px solid rgba(255, 255, 255, 0.5);
      font-size: 0.9375rem;
    }
    
    .skills li:hover {
      transform: translateX(8px);
      background: rgba(17, 17, 17, 0.8);
      border-left-color: #fff;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    }
    
    /* ========== PROJECTS SECTION ========== */
    .project-grid { 
      display: grid; 
      grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr)); 
      gap: 2rem; 
    }
    
    .project-card { 
      background: rgba(17, 17, 17, 0.6);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      padding: 1.5rem; 
      border-radius: 12px; 
      transition: all 0.3s ease; 
      overflow: hidden;
      position: relative;
      border: 1px solid rgba(255, 255, 255, 0.05);
    }
    
    .project-card:before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.08), transparent);
      transition: left 0.6s ease;
    }
    
    .project-card:hover:before {
      left: 100%;
    }
    
    .project-card:hover { 
      transform: translateY(-8px); 
      box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
      border-color: rgba(255, 255, 255, 0.1);
    }
    
    .project-card img { 
      width: 100%; 
      height: 12.5rem;
      object-fit: cover;
      border-radius: 8px; 
      margin-bottom: 1rem; 
      transition: all 0.3s ease;
      background: rgba(0, 0, 0, 0.3);
    }
    
    .project-card:hover img {
      transform: scale(1.02);
    }
    
    .project-card h3 { 
      margin-bottom: 0.75rem;
      font-size: 1.25rem;
      font-weight: 600;
      line-height: 1.3;
    }

    .project-card p {
      font-size: 0.9375rem;
      line-height: 1.6;
      opacity: 0.85;
      margin-bottom: 1rem;
    }
    
    .project-links {
      display: flex;
      gap: 0.75rem;
      margin-top: 1.25rem;
      flex-wrap: wrap;
    }
    
    .project-link {
      padding: 0.5rem 1rem;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 6px;
      text-decoration: none;
      color: #fff;
      font-size: 0.875rem;
      font-weight: 600;
      transition: all 0.3s ease;
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .project-link:hover,
    .project-link:focus {
      background: #fff;
      color: #000;
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(255, 255, 255, 0.2);
      outline: none;
    }

    .project-link:focus-visible {
      outline: 2px solid rgba(255, 255, 255, 0.5);
      outline-offset: 2px;
    }
    
    /* ========== CONTACT SECTION ========== */
    #contact {
      align-items: center;
    }

    form { 
      display: flex; 
      flex-direction: column; 
      gap: 1rem; 
      max-width: 32rem; 
      width: 100%;
      margin: 0 auto;
    }
    
    form input, 
    form textarea { 
      padding: 0.875rem 1rem; 
      border-radius: 6px; 
      border: 1px solid rgba(255, 255, 255, 0.1);
      outline: none; 
      background: rgba(17, 17, 17, 0.6);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      color: #fff; 
      width: 100%;
      transition: all 0.3s ease;
      font-family: inherit;
      font-size: 1rem;
    }

    form input::placeholder,
    form textarea::placeholder {
      color: rgba(255, 255, 255, 0.5);
    }
    
    form input:focus, 
    form textarea:focus {
      border-color: rgba(255, 255, 255, 0.3);
      background: rgba(17, 17, 17, 0.8);
      box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
    }

    form textarea {
      resize: vertical;
      min-height: 8rem;
    }
    
    form button { 
      padding: 0.875rem 1.5rem; 
      background: #fff; 
      color: #000; 
      border: 2px solid #fff;
      border-radius: 6px; 
      cursor: pointer; 
      font-weight: 700;
      font-size: 1rem;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      transition: all 0.3s ease;
      margin-top: 0.5rem;
    }
    
    form button:hover,
    form button:focus { 
      background: transparent; 
      color: #fff;
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(255, 255, 255, 0.2);
      outline: none;
    }

    form button:focus-visible {
      outline: 2px solid rgba(255, 255, 255, 0.5);
      outline-offset: 4px;
    }

    form button:active {
      transform: translateY(0);
    }

    .form-status {
      padding: 1rem;
      border-radius: 6px;
      margin-top: 1rem;
      text-align: center;
      font-size: 0.9375rem;
      display: none;
    }

    .form-status.success {
      background: rgba(76, 175, 80, 0.2);
      border: 1px solid rgba(76, 175, 80, 0.5);
      color: #4CAF50;
    }

    .form-status.error {
      background: rgba(244, 67, 54, 0.2);
      border: 1px solid rgba(244, 67, 54, 0.5);
      color: #F44336;
    }
    
    /* ========== FOOTER ========== */
    footer {
      padding: 3rem 2.5rem;
      text-align: center;
      background: transparent;
      position: relative;
      z-index: 2;
    }
    
    .social-links {
      display: flex;
      justify-content: center;
      gap: 2rem;
      margin-bottom: 1.5rem;
      flex-wrap: wrap;
    }
    
    .social-link {
      color: #fff;
      font-size: 0.9375rem;
      font-weight: 600;
      transition: all 0.3s ease;
      opacity: 0.7;
      text-decoration: none;
      padding: 0.5rem;
    }
    
    .social-link:hover,
    .social-link:focus {
      opacity: 1;
      transform: translateY(-3px);
      outline: none;
    }

    .social-link:focus-visible {
      outline: 2px solid rgba(255, 255, 255, 0.5);
      outline-offset: 4px;
      border-radius: 4px;
    }
    
    footer p {
      opacity: 0.6;
      font-size: 0.875rem;
    }
    
    /* ========== 3D BALL BACKGROUND ========== */
    .scene { 
      width: clamp(20rem, 40vw, 37.5rem);
      height: clamp(20rem, 40vw, 37.5rem);
      position: fixed; 
      top: 50%; 
      left: 50%; 
      transform: translate(-50%, -50%) rotateX(45deg) rotateY(45deg); 
      perspective: 1000px; 
      z-index: 0; 
      pointer-events: none; 
      opacity: 0.2;
      will-change: transform;
    }
    
    .wrapper { 
      width: 100%; 
      height: 100%; 
      transform-style: preserve-3d; 
    }
    
    .ball { 
      position: relative; 
      width: 100%; 
      height: 100%; 
      transform-style: preserve-3d; 
      animation: roundandround 20s infinite linear; 
    }
    
    .ball .ring { 
      position: absolute; 
      top: 0; 
      left: 0; 
      width: 100%; 
      height: 100%; 
      border: 1px dashed rgba(255, 255, 255, 0.3);
      border-radius: 50%; 
      opacity: 0; 
      animation: show 0.75s forwards ease-in-out; 
    }

    .ring:nth-child(1) { transform: rotateY(4deg); animation-delay: 0s; }
    .ring:nth-child(2) { transform: rotateY(8deg); animation-delay: 0.05s; }
    .ring:nth-child(3) { transform: rotateY(12deg); animation-delay: 0.1s; }
    .ring:nth-child(4) { transform: rotateY(16deg); animation-delay: 0.15s; }
    .ring:nth-child(5) { transform: rotateY(20deg); animation-delay: 0.2s; }
    .ring:nth-child(6) { transform: rotateY(24deg); animation-delay: 0.25s; }
    .ring:nth-child(7) { transform: rotateY(28deg); animation-delay: 0.3s; }
    .ring:nth-child(8) { transform: rotateY(32deg); animation-delay: 0.35s; }
    .ring:nth-child(9) { transform: rotateY(36deg); animation-delay: 0.4s; }
    .ring:nth-child(10){ transform: rotateY(40deg); animation-delay: 0.45s; }
    .ring:nth-child(11){ transform: rotateY(44deg); animation-delay: 0.5s; }
    .ring:nth-child(12){ transform: rotateY(48deg); animation-delay: 0.45s; }
    .ring:nth-child(13){ transform: rotateY(52deg); animation-delay: 0.4s; }
    .ring:nth-child(14){ transform: rotateY(56deg); animation-delay: 0.35s; }
    .ring:nth-child(15){ transform: rotateY(60deg); animation-delay: 0.3s; }
    .ring:nth-child(16){ transform: rotateY(64deg); animation-delay: 0.25s; }
    .ring:nth-child(17){ transform: rotateY(68deg); animation-delay: 0.2s; }
    .ring:nth-child(18){ transform: rotateY(72deg); animation-delay: 0.15s; }
    .ring:nth-child(19){ transform: rotateY(76deg); animation-delay: 0.1s; }
    .ring:nth-child(20){ transform: rotateY(80deg); animation-delay: 0.05s; }

    @keyframes roundandround { 
      to { transform: rotateX(360deg) rotateY(360deg); } 
    }
    
    @keyframes show { 
      to { opacity: 0.6; } 
    }
    
    /* ========== PARTICLE BACKGROUND ========== */
    #particles-js {
      position: fixed;
      width: 100%;
      height: 100%;
      z-index: 0;
      top: 0;
      left: 0;
      opacity: 0.6;
    }

    #webgl {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 1;
      pointer-events: none;
    }

    .loading {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: #000;
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 1;
      transition: opacity 0.5s ease;
    }

    .loading.hidden {
      opacity: 0;
      pointer-events: none;
    }

    .loading-spinner {
      width: 3rem;
      height: 3rem;
      border: 3px solid rgba(255, 255, 255, 0.1);
      border-top-color: #fff;
      border-radius: 50%;
      animation: spin 1s linear infinite;
    }

    @keyframes spin {
      to { transform: rotate(360deg); }
    }

    .skip-to-content {
      position: absolute;
      top: -100%;
      left: 50%;
      transform: translateX(-50%);
      background: #fff;
      color: #000;
      padding: 0.75rem 1.5rem;
      text-decoration: none;
      font-weight: 700;
      z-index: 1001;
      border-radius: 0 0 4px 4px;
      transition: top 0.3s ease;
    }

    .skip-to-content:focus {
      top: 0;
    }

    /* ========== RESPONSIVE DESIGN ========== */
    @media (max-width: 768px) {
      header {
        padding: 1rem 1.25rem;
        flex-direction: column;
        gap: 0.75rem;
      }
      
      .logo {
        font-size: 0.9375rem;
      }

      .datetime-container {
        margin-left: 0;
        align-items: center;
        order: -1;
      }
      
      nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.75rem;
      }
      
      nav a {
        font-size: 0.8125rem;
      }
      
      main section {
        padding: 5rem 1.25rem;
      }
      
      .hero {
        padding: 5rem 1.25rem 3rem;
      }
      
      .hero h1 {
        margin-bottom: 1.5rem;
      }
      
      .hero .quote {
        margin-bottom: 2rem;
      }
      
      .hero .tagline {
        margin-bottom: 2rem;
      }
      
      .hero-cta {
        flex-direction: column;
        width: 100%;
        max-width: 20rem;
      }
      
      .cta-btn {
        width: 100%;
        text-align: center;
      }
      
      #progress {
        right: 1.25rem;
        bottom: 1rem;
        font-size: 0.6875rem;
        padding: 0.375rem 0.75rem;
      }
      
      .scene {
        width: clamp(15rem, 50vw, 20rem);
        height: clamp(15rem, 50vw, 20rem);
        opacity: 0.15;
      }

      .skills-container {
        grid-template-columns: 1fr;
        gap: 2rem;
      }

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

      .social-links {
        gap: 1.25rem;
      }

      .calendar-container {
        padding: 1.5rem;
      }

      .calendar-month-year {
        font-size: 1rem;
      }

      .calendar-day {
        font-size: 0.8125rem;
      }
    }

    @media (max-width: 480px) {
      nav a:last-child {
        width: 100%;
        text-align: center;
      }

      section h2 {
        margin-bottom: 2rem;
      }
    }

    @media print {
      header,
      #progress,
      .scene,
      #particles-js,
      #webgl,
      .hero-cta,
      .calendar-modal {
        display: none !important;
      }

      body {
        background: #fff;
        color: #000;
      }

      .hero,
      main section {
        min-height: auto;
        page-break-inside: avoid;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
      }

      .scene,
      #particles-js,
      #webgl {
        display: none;
      }
    }