/* Text Alignment */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

/* Spacing Utilities */
.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mr-xs { margin-right: var(--spacing-xs); }
.mr-sm { margin-right: var(--spacing-sm); }
.mr-md { margin-right: var(--spacing-md); }

.ml-xs { margin-left: var(--spacing-xs); }
.ml-sm { margin-left: var(--spacing-sm); }
.ml-md { margin-left: var(--spacing-md); }

.pt-md { padding-top: var(--spacing-md); }
.pt-lg { padding-top: var(--spacing-lg); }

.py-xl { padding-top: var(--spacing-xl); padding-bottom: var(--spacing-xl); }

/* Padding Utilities - Extended */
.p-xs { padding: var(--spacing-xs); }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }

.px-xs { padding-left: var(--spacing-xs); padding-right: var(--spacing-xs); }
.px-sm { padding-left: var(--spacing-sm); padding-right: var(--spacing-sm); }
.px-md { padding-left: var(--spacing-md); padding-right: var(--spacing-md); }
.px-lg { padding-left: var(--spacing-lg); padding-right: var(--spacing-lg); }

.py-xs { padding-top: var(--spacing-xs); padding-bottom: var(--spacing-xs); }
.py-sm { padding-top: var(--spacing-sm); padding-bottom: var(--spacing-sm); }
.py-md { padding-top: var(--spacing-md); padding-bottom: var(--spacing-md); }
.py-lg { padding-top: var(--spacing-lg); padding-bottom: var(--spacing-lg); }

/* Flexbox Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.flex-row-reverse { flex-direction: row-reverse; }
.flex-1 { flex: 1; }
.flex-shrink-0 { flex-shrink: 0; }

.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }

.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }

.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }

/* Typography Utilities */
.text-xs { font-size: 0.75rem; }
.text-sm { font-size: var(--font-size-sm); }
.text-md { font-size: 1rem; }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 2rem; }

/* Text Colors State */
.text-success { color: var(--state-success); }
.text-warning { color: var(--state-warning); }
.text-error { color: var(--state-error); }

.font-bold { font-weight: 600; }
.font-normal { font-weight: 400; }

.text-secondary { color: var(--text-secondary); }
.text-primary { color: var(--primary-color); }

.whitespace-nowrap { white-space: nowrap; }
.line-through { text-decoration: line-through; }
.underline { text-decoration: underline; }
.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Width & Height Utilities */
.w-full { width: 100%; }
.w-8 { width: 2rem; }
.w-10 { width: 2.5rem; }
.w-12 { width: 3rem; }
.w-1\.5 { width: 0.375rem; }

.h-8 { height: 2rem; }
.h-10 { height: 2.5rem; }
.h-12 { height: 3rem; }
.h-2 { height: 0.5rem; }
.h-1\.5 { height: 0.375rem; }
.h-20 { height: 5rem; }
.h-screen { height: 100vh; }

.max-w-sm { max-width: 24rem; }
.max-w-md { max-width: 28rem; }
.max-w-lg { max-width: 32rem; }

/* Display Utilities */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

/* Overflow Utilities */
.overflow-hidden { overflow: hidden; }
.overflow-y-auto { overflow-y: auto; }
.overflow-x-auto { overflow-x: auto; }

/* Border Utilities */
.border-t { border-top: 1px solid var(--border-color); }
.border-b { border-bottom: 1px solid var(--border-color); }
.border-l-4 { border-left: 4px solid; }

.border-primary { border-color: var(--primary-color); }
.border-gray-200 { border-color: var(--color-gray-200); }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }
.rounded-tl-none { border-top-left-radius: 0; }
.rounded-tr-none { border-top-right-radius: 0; }

/* Background Utilities */
.bg-white { background-color: var(--color-white); }
.bg-gray-50 { background-color: var(--color-gray-50); }
.bg-gray-100 { background-color: var(--color-gray-100); }
.bg-gray-200 { background-color: var(--color-gray-200); }
.bg-gray-300 { background-color: var(--color-gray-300); }
.bg-blue-50 { background-color: var(--color-blue-50); }
.bg-blue-100 { background-color: var(--color-blue-100); }
.bg-orange-100 { background-color: var(--color-amber-100); }
.bg-primary { background-color: var(--primary-color); }
.bg-secondary { background-color: var(--bg-surface); } /* Assuming secondary bg is surface or gray-100? Using surface from register.js context check */
.bg-error { background-color: var(--state-error); }
.aspect-square { aspect-ratio: 1 / 1; }

.text-green-500 { color: var(--color-emerald-500); }
.text-blue-500 { color: var(--color-blue-500); }
.text-orange-600 { color: var(--color-amber-600); }

/* Opacity Utilities */
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.opacity-90 { opacity: 0.9; }

/* Shadow Utilities */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

/* Grid Utilities */
.grid { display: grid; }
.grid-2, .grid-cols-2 { display: grid; grid-template-columns: repeat(2, 1fr); }
.grid-3, .grid-cols-3 { display: grid; grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { display: grid; grid-template-columns: repeat(4, 1fr); }
.grid-cols-7 { display: grid; grid-template-columns: repeat(7, 1fr); }
.gap-1 { gap: 0.25rem; }

/* Responsive Grid Adaptations */
@media (max-width: 480px) {
    .grid-3, .grid-cols-3 {
        gap: var(--spacing-sm);
    }
}

@media (max-width: 360px) {
    /* On very small screens (e.g. Galaxy Fold folded, old SE), reduce columns */
    .grid-3, .grid-cols-3 {
        grid-template-columns: repeat(2, 1fr); /* 3 cols -> 2 cols */
    }
    .grid-2, .grid-cols-2 {
        grid-template-columns: 1fr; /* 2 cols -> 1 col */
    }
    .grid-cols-4 {
        grid-template-columns: repeat(4, 1fr); /* Keep 4 for small thumbnails, but they will be tiny */
    }
}

/* Cursor Utilities */
.clickable {
    cursor: pointer;
    user-select: none;
}

.cursor-pointer { cursor: pointer; }

/* Position Utilities */
.sticky { position: sticky; }
.fixed { position: fixed; }
.absolute { position: absolute; }
.relative { position: relative; }

.top-0 { top: 0; }
.bottom-0 { bottom: 0; }
.left-0 { left: 0; }
.right-0 { right: 0; }

.z-10 { z-index: 10; }

/* Animation Utilities */
.fade-in {
    animation: fadeIn 0.3s ease-out;
}

.fade-out {
    animation: fadeOut 0.3s ease-out;
}

.slide-up {
    animation: slideUp 0.3s ease-out;
}

.slide-down {
    animation: slideDown 0.3s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Loading State Utilities */
.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.6;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin-top: -10px;
    margin-left: -10px;
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

/* Page Transition */
.page-transitioning {
    opacity: 0.8;
    transition: opacity 0.15s ease-out;
}

/* Hover Effects */
.hover-lift {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.hover-lift:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* Space Utilities */
.space-y-2 > * + * {
    margin-top: 0.5rem;
}

.space-y-4 > * + * {
    margin-top: 1rem;
}

/* Badge Danger */
.badge-danger {
    background-color: var(--color-red-500);
    color: var(--color-text-inverse);
}