body {
    font-family: 'Inter', sans-serif;
    background-color: #0d1117;
    color: #c9d1d9;
    overflow-x: hidden;
}

/* --- Aurora Background --- */
.aurora-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}
.aurora-outer {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 200vw;
    height: 200vh;
    transform: translate(-50%, -50%);
    animation: rotate 20s linear infinite;
}
.aurora-inner {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(circle at 25% 25%, rgba(0, 119, 255, 0.2) 0%, transparent 40%),
                      radial-gradient(circle at 75% 25%, rgba(0, 255, 136, 0.2) 0%, transparent 40%),
                      radial-gradient(circle at 75% 75%, rgba(255, 77, 148, 0.2) 0%, transparent 40%),
                      radial-gradient(circle at 25% 75%, rgba(255, 165, 0, 0.2) 0%, transparent 40%);
}
@keyframes rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* --- Glassmorphism Card --- */
.glass-card {
    background: rgba(22, 27, 34, 0.6);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    transition: all 0.3s ease;
}

/* --- Scroll Animations --- */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Letter Reveal Animations --- */
#animated-headline .letter, .animated-title .char {
    display: inline-block;
    opacity: 0;
}

#animated-headline .letter {
    transform: translateY(20px) scale(0.8);
    animation: letter-reveal 0.5s forwards;
}

@keyframes letter-reveal {
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.animated-title.is-visible .char {
    animation: letter-jump 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}
@keyframes letter-jump {
    0% {
        opacity: 0;
        transform: translateY(50px) scale(0.5) rotate(15deg);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1) rotate(0deg);
    }
}

/* --- Profile Picture Glow --- */
@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 15px rgba(0, 255, 255, 0.2); }
    50% { box-shadow: 0 0 25px rgba(0, 255, 255, 0.5); }
}
.animate-pulse-glow {
    animation: pulse-glow 3s infinite ease-in-out;
}

/* --- Project Slider --- */
.slider {
    width: 100%;
    overflow: hidden;
    -webkit-mask-image: linear-gradient(to right, transparent, #000 10%, #000 90%, transparent);
    mask-image: linear-gradient(to right, transparent, #000 10%, #000 90%, transparent);
}
.slider-track {
    display: flex;
    width: calc(350px * 18); /* Card width * number of cards (9 original + 9 copies) */
    animation: scroll 65s linear infinite;
}
.slider:hover .slider-track {
    animation-play-state: paused;
}
.slide {
    width: 350px;
    flex-shrink: 0;
    padding: 0 1rem;
}
@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(calc(-350px * 9)); } /* Scroll the length of the original 9 cards */
}

/* --- Sidebar Navigation --- */
#sidebar {
    transition: transform 0.3s ease-in-out;
}
.sidebar-nav a {
    transition: all 0.2s ease;
}
.sidebar-nav a.active {
    background-color: rgba(3, 138, 255, 0.2);
    color: #58a6ff;
    border-right: 3px solid #58a6ff;
}
.sidebar-nav a:hover:not(.active) {
    background-color: rgba(255, 255, 255, 0.05);
    transform: translateX(5px);
}

/* --- Zigzag Timeline --- */
.timeline-container::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 0;
    width: 2px;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.1);
}
.timeline-item {
    width: 50%;
    margin-bottom: 50px;
    position: relative;
}
.timeline-item:nth-child(odd) {
    align-self: flex-start;
    padding-right: 50px;
    text-align: right;
}
.timeline-item:nth-child(even) {
    align-self: flex-end;
    padding-left: 50px;
}
.timeline-dot {
    content: '';
    position: absolute;
    top: 5px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: #58a6ff;
    border: 3px solid #0d1117;
    z-index: 10;
    transition: all 0.3s ease;
}
.timeline-item:nth-child(odd) .timeline-dot {
    right: -8px;
}
.timeline-item:nth-child(even) .timeline-dot {
    left: -8px;
}
.timeline-item:hover .timeline-dot {
    transform: scale(1.2);
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.7);
}
.timeline-line {
    content: '';
    position: absolute;
    top: 12px;
    width: 50px;
    height: 2px;
    background-color: rgba(255, 255, 255, 0.1);
}
.timeline-item:nth-child(odd) .timeline-line {
    right: 0;
}
.timeline-item:nth-child(even) .timeline-line {
    left: 0;
}

/* --- Skill Tooltip --- */
.skill-tooltip {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s ease-out, transform 0.3s ease-out;
    pointer-events: none;
}
.group:hover .skill-tooltip {
    opacity: 1;
    transform: translateY(0);
}
.skill-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: rgba(30, 41, 59, 0.7) transparent transparent transparent;
}




/* === Navigation Hover Jump Animation === */
@keyframes nav-jump {
    0% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
    100% { transform: translateY(0); }
  }
  
  .sidebar-nav a:hover {
    animation: nav-jump 0.4s ease;
  }
  
  /* === Animate-On-Scroll with Bounce === */
  .animate-on-scroll {
    opacity: 0;
    transform: scale(0.95) translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
  }
  
  .animate-on-scroll.is-visible {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
  
  /* === Letter Reveal (Already Present, Keep Updated) === */
  @keyframes letter-jump {
    0% {
      opacity: 0;
      transform: translateY(50px) scale(0.5) rotate(15deg);
    }
    80% {
      transform: translateY(-8px) scale(1.05) rotate(0deg);
    }
    100% {
      opacity: 1;
      transform: translateY(0) scale(1) rotate(0deg);
    }
  }
  
  .animated-title.is-visible .char {
    animation: letter-jump 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
  }
  
  /* === Floating Hover Effect for Cards or Buttons === */
  .button-style, .skill-badge, .glass-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  
  .button-style:hover, .skill-badge:hover, .glass-card:hover {
    transform: translateY(-5px) scale(1.03);
    box-shadow: 0 10px 20px rgba(0, 255, 255, 0.1);
  }
  
  /* === Scroll-Down Cue === */
  .scroll-down-cue {
    width: 26px;
    height: 40px;
    border: 2px solid #58a6ff;
    border-radius: 13px;
    margin: 30px auto 0;
    position: relative;
    opacity: 0.75;
  }
  
  .scroll-down-cue::after {
    content: '';
    width: 6px;
    height: 6px;
    background: #58a6ff;
    position: absolute;
    left: 50%;
    top: 8px;
    transform: translateX(-50%);
    border-radius: 50%;
    animation: scroll-down 1.5s infinite;
  }
  
  @keyframes scroll-down {
    0% { top: 8px; opacity: 1; }
    50% { top: 20px; opacity: 0.5; }
    100% { top: 8px; opacity: 1; }
  }