/* Main CSS - Reset & Typography */
:root {
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --transition-speed: 0.3s;
    --sidebar-width: 280px;
    --header-height: 64px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow: hidden; /* App interaction model */
    height: 100vh;
    width: 100vw;
    font-size: 16px;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

input, button, textarea {
    font-family: inherit;
    border: none;
    outline: none;
}

button {
    cursor: pointer;
    user-select: none;
}

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

.hidden {
    display: none !important;
}

/* Utility Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.3s ease-out forwards;
}