/* Modern CSS Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-secondary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    overflow-x: hidden;
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    margin: 0;
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
    margin: 0;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary);
}

button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
    transition: all var(--transition-fast);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

ul, ol {
    list-style: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background: transparent;
    border: none;
    outline: none;
}

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

::-webkit-scrollbar-track {
    background: var(--color-background-light);
}

::-webkit-scrollbar-thumb {
    background: var(--color-surface-elevated);
    border-radius: var(--radius-full);
    transition: background var(--transition-fast);
}

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

/* Selection */
::selection {
    background: var(--color-primary);
    color: var(--color-text-primary);
}

::-moz-selection {
    background: var(--color-primary);
    color: var(--color-text-primary);
}

/* Focus Styles */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Utility Classes */
.container {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Main Layout */
.main-content {
    min-height: calc(100vh - var(--navbar-height));
    padding-top: var(--navbar-height);
}

/* Loading States */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-surface) 0%,
        var(--color-surface-elevated) 50%,
        var(--color-surface) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Error and Empty States */
.error-state,
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    padding: var(--spacing-3xl);
    text-align: center;
}

.error-state h2,
.empty-state h2 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.error-state p,
.empty-state p {
    color: var(--color-text-secondary);
    max-width: 500px;
    margin-bottom: var(--spacing-xl);
}

.error-icon,
.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

/* Responsive Text */
@media (max-width: 768px) {
    body {
        font-size: var(--font-size-sm);
    }
}

/* Print Styles */
@media print {
    .navbar,
    .modal,
    .toast-container,
    .loading-overlay {
        display: none !important;
    }
}