:root {
    --blue: #3b82f6;
    --purple: #8b5cf6;
    --slate-light: #f1f5f9;
    --slate-dark: #020617;
    --text-light: #1e293b;
    --text-dark: #e2e8f0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--slate-light);
    color: var(--text-light);
    scroll-behavior: smooth;
    cursor: none; /* Accessibility concern: can make navigation difficult if JS fails */
}

.dark body {
    background-color: var(--slate-dark);
    color: var(--text-dark);
}

.font-code { 
    font-family: 'Fira Code', monospace; 
}

/* --- Animated Gradient Background --- */
.gradient-bg {
    position: fixed;
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%;
    background: linear-gradient(45deg, #a5b4fc, #fbcfe8, #a7f3d0);
    background-size: 400% 400%;
    animation: gradient-animation 15s ease infinite;
    z-index: -1;
}

.dark .gradient-bg {
    background: linear-gradient(45deg, #1e3a8a, #4c1d95, #047857);
    background-size: 400% 400%;
    animation: gradient-animation 15s ease infinite;
}

@keyframes gradient-animation {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* --- Custom Cursor --- */
.cursor-dot {
    width: 8px; 
    height: 8px; 
    background-color: var(--blue);
    border-radius: 50%; 
    position: fixed; 
    top: 0; 
    left: 0;
    transform: translate(-50%, -50%); 
    pointer-events: none;
    z-index: 9999;
    transition: transform 0.15s ease-out, width 0.2s ease, height 0.2s ease, background-color 0.2s ease;
}

.cursor-dot.hovered {
    width: 32px; 
    height: 32px; 
    background-color: rgba(59, 130, 246, 0.2);
}

a, button, [role="button"] { 
    cursor: none; 
}

/* --- Nav --- */
nav {
    background-color: rgba(241, 245, 249, 0.5); /* light theme */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
}

.dark nav {
    background-color: rgba(2, 6, 23, 0.5);
    border-bottom-color: rgba(30, 41, 59, 0.8);
}

.nav-link::after {
    content: ''; 
    position: absolute; 
    width: 0; 
    height: 2px;
    bottom: -4px; 
    left: 50%; 
    transform: translateX(-50%);
    background-color: var(--blue); 
    transition: width 0.3s ease-in-out;
}

.nav-link:hover::after { 
    width: 100%; 
}

/* --- General --- */
.section-heading { 
    display: inline-block; 
    border-bottom: 3px solid var(--blue); 
    padding-bottom: 0.5rem; 
}

.card {
    background-color: rgba(255, 255, 255, 0.7);
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

.dark .card {
    background-color: rgba(15, 23, 42, 0.7);
    border-color: #1e293b;
}

.card:hover { 
    transform: translateY(-8px); 
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04); 
}

/* --- Project Filtering --- */
.project-card { 
    transition: transform 0.4s ease, opacity 0.4s ease; 
}

.filter-btn.active { 
    background-color: var(--blue) !important; 
    color: white !important; 
}

/* --- Timeline --- */
.timeline-line { 
    background-color: #cbd5e1; 
}

.dark .timeline-line { 
    background-color: #334155; 
}

.timeline-dot { 
    background-color: var(--slate-light); 
    border: 2px solid var(--blue); 
}

.dark .timeline-dot { 
    background-color: var(--slate-dark); 
}

/* Toast Notification */
.toast { 
    position: fixed; 
    bottom: 2rem; 
    left: 50%; 
    transform: translate(-50%, 200%); 
    transition: transform 0.5s ease-in-out; 
    z-index: 100; 
}

.toast.show { 
    transform: translate(-50%, 0); 
}