/* Study Tracker - Static CSS */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    color: #374151;
    background-color: #f9fafb;
}

/* Utility Classes */
.min-h-screen { min-height: 100vh; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.space-x-2 > * + * { margin-left: 0.5rem; }
.space-x-3 > * + * { margin-left: 0.75rem; }
.space-x-4 > * + * { margin-left: 1rem; }
.space-y-2 > * + * { margin-top: 0.5rem; }
.space-y-4 > * + * { margin-top: 1rem; }
.space-y-6 > * + * { margin-top: 1.5rem; }
.w-full { width: 100%; }
.w-8 { width: 2rem; }
.w-12 { width: 3rem; }
.w-96 { width: 24rem; }
.h-3 { height: 0.75rem; }
.h-5 { width: 1.25rem; height: 1.25rem; }
.h-8 { width: 2rem; height: 2rem; }
.h-12 { width: 3rem; height: 3rem; }
.h-16 { height: 4rem; }
.max-w-md { max-width: 28rem; }
.max-w-7xl { max-width: 80rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-5 { padding: 1.25rem; }
.p-6 { padding: 1.5rem; }
.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mr-3 { margin-right: 0.75rem; }
.ml-3 { margin-left: 0.75rem; }
.mx-auto { margin-left: auto; margin-right: auto; }
.text-center { text-align: center; }
.text-sm { font-size: 0.875rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-xs { font-size: 0.75rem; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.rounded { border-radius: 0.25rem; }
.rounded-md { border-radius: 0.375rem; }
.rounded-lg { border-radius: 0.5rem; }
.rounded-full { border-radius: 9999px; }
.border { border-width: 1px; }
.border-b { border-bottom-width: 1px; }
.shadow-sm { box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05); }
.shadow-lg { box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); }
.hidden { display: none; }
.block { display: block; }
.inline { display: inline; }
.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.gap-4 { gap: 1rem; }
.divide-y > * + * { border-top-width: 1px; }
.fixed { position: fixed; }
.relative { position: relative; }
.top-20 { top: 5rem; }
.inset-0 { top: 0; right: 0; bottom: 0; left: 0; }
.z-50 { z-index: 50; }
.overflow-y-auto { overflow-y: auto; }
.transition-colors { transition-property: color, background-color, border-color, text-decoration-color, fill, stroke; }
.transition-all { transition-property: all; }
.duration-200 { transition-duration: 200ms; }
.duration-300 { transition-duration: 300ms; }
.animate-spin { animation: spin 1s linear infinite; }

/* Color Classes */
.bg-white { background-color: #ffffff; }
.bg-gray-50 { background-color: #f9fafb; }
.bg-gray-100 { background-color: #f3f4f6; }
.bg-gray-200 { background-color: #e5e7eb; }
.bg-gray-600 { background-color: #4b5563; }
.bg-blue-50 { background-color: #eff6ff; }
.bg-blue-500 { background-color: #3b82f6; }
.bg-blue-600 { background-color: #2563eb; }
.bg-blue-700 { background-color: #1d4ed8; }
.bg-red-50 { background-color: #fef2f2; }
.bg-gradient-to-br { background-image: linear-gradient(to bottom right, var(--tw-gradient-stops)); }
.from-blue-50 { --tw-gradient-from: #eff6ff; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(239, 246, 255, 0)); }
.to-indigo-100 { --tw-gradient-to: #e0e7ff; }
.bg-opacity-50 { --tw-bg-opacity: 0.5; }

.text-white { color: #ffffff; }
.text-gray-400 { color: #9ca3af; }
.text-gray-500 { color: #6b7280; }
.text-gray-600 { color: #4b5563; }
.text-gray-700 { color: #374151; }
.text-gray-800 { color: #1f2937; }
.text-gray-900 { color: #111827; }
.text-blue-600 { color: #2563eb; }
.text-blue-800 { color: #1e40af; }
.text-red-600 { color: #dc2626; }
.text-red-800 { color: #991b1b; }

.border-gray-200 { border-color: #e5e7eb; }
.border-gray-300 { border-color: #d1d5db; }
.border-blue-500 { border-color: #3b82f6; }
.border-red-200 { border-color: #fecaca; }

/* Hover States */
.hover\:bg-blue-600:hover { background-color: #2563eb; }
.hover\:bg-blue-700:hover { background-color: #1d4ed8; }
.hover\:text-gray-600:hover { color: #4b5563; }
.hover\:text-gray-800:hover { color: #1f2937; }
.hover\:text-blue-800:hover { color: #1e40af; }
.hover\:text-red-800:hover { color: #991b1b; }

/* Focus States */
.focus\:outline-none:focus { outline: 2px solid transparent; outline-offset: 2px; }
.focus\:ring-2:focus { --tw-ring-offset-shadow: var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color); --tw-ring-shadow: var(--tw-ring-inset) 0 0 0 calc(2px + var(--tw-ring-offset-width)) var(--tw-ring-color); box-shadow: var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow, 0 0 #0000); }
.focus\:ring-blue-500:focus { --tw-ring-color: #3b82f6; }
.focus\:ring-offset-2:focus { --tw-ring-offset-width: 2px; }
.focus\:border-blue-500:focus { border-color: #3b82f6; }

/* Responsive Design */
@media (min-width: 640px) {
    .sm\:px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
}

@media (min-width: 768px) {
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
    .lg\:px-8 { padding-left: 2rem; padding-right: 2rem; }
}

/* Custom Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    transition-property: color, background-color, border-color, text-decoration-color, fill, stroke;
    transition-duration: 200ms;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: #2563eb;
    color: #ffffff;
    padding: 0.5rem 1rem;
}

.btn-primary:hover {
    background-color: #1d4ed8;
}

.btn-secondary {
    background-color: #f3f4f6;
    color: #374151;
    padding: 0.5rem 1rem;
}

.btn-secondary:hover {
    background-color: #e5e7eb;
}

.input {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    transition-property: color, background-color, border-color, text-decoration-color, fill, stroke;
    transition-duration: 200ms;
}

.input:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

.input::placeholder {
    color: #9ca3af;
}

.card {
    background-color: #ffffff;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    border: 1px solid #e5e7eb;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(75, 85, 99, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
}

.modal-content {
    background-color: #ffffff;
    border-radius: 0.5rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    max-width: 24rem;
    width: 100%;
    margin: 1.25rem;
}

.progress-bar {
    width: 100%;
    height: 0.75rem;
    background-color: #e5e7eb;
    border-radius: 9999px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: #2563eb;
    transition: width 300ms ease-in-out;
}

.subject-item {
    padding: 1.5rem;
    border-bottom: 1px solid #e5e7eb;
}

.subject-item:last-child {
    border-bottom: none;
}

.topic-item {
    padding: 1rem;
    margin: 0.5rem 0;
    background-color: #f9fafb;
    border-radius: 0.375rem;
    border: 1px solid #e5e7eb;
}

.checkbox {
    width: 1rem;
    height: 1rem;
    border: 1px solid #d1d5db;
    border-radius: 0.25rem;
    cursor: pointer;
}

.checkbox:checked {
    background-color: #2563eb;
    border-color: #2563eb;
}

.tab {
    padding: 0.5rem 1rem;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all 200ms;
}

.tab.active {
    border-bottom-color: #2563eb;
    color: #2563eb;
}

.tab:hover {
    color: #2563eb;
}

/* Animations */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes pulse {
    50% {
        opacity: .5;
    }
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner {
    animation: spin 1s linear infinite;
}

/* Error States */
.error {
    color: #dc2626;
    background-color: #fef2f2;
    border-color: #fecaca;
}

/* Success States */
.success {
    color: #059669;
    background-color: #ecfdf5;
    border-color: #a7f3d0;
}

/* Disabled States */
.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Mobile Responsive */
@media (max-width: 640px) {
    .modal-content {
        margin: 1rem;
        max-width: calc(100% - 2rem);
    }
    
    .grid-cols-2 {
        grid-template-columns: 1fr;
    }
    
    .space-x-4 > * + * {
        margin-left: 0;
        margin-top: 0.5rem;
    }
    
    .flex-col-mobile {
        flex-direction: column;
    }
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #111827;
        color: #f9fafb;
    }
    
    .card {
        background-color: #1f2937;
        border-color: #374151;
    }
    
    .input {
        background-color: #1f2937;
        border-color: #374151;
        color: #f9fafb;
    }
    
    .modal-content {
        background-color: #1f2937;
    }
}