/* EduTools - Custom CSS Stylesheet */
/* Replacing Tailwind CSS with custom 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;
    background-color: #f9fafb;
    color: #1f2937;
    line-height: 1.6;
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1rem;
}

@media (min-width: 640px) {
    .container {
        padding: 0 1.5rem;
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 2rem;
    }
}

/* Colors */
.bg-white { background-color: #ffffff; }
.bg-gray-50 { background-color: #f9fafb; }
.bg-gray-900 { background-color: #111827; }
.bg-blue-50 { background-color: #eff6ff; }
.bg-blue-100 { background-color: #dbeafe; }
.bg-blue-600 { background-color: #2563eb; }
.bg-blue-700 { background-color: #1d4ed8; }
.bg-purple-50 { background-color: #faf5ff; }
.bg-purple-100 { background-color: #f3e8ff; }
.bg-purple-600 { background-color: #9333ea; }
.bg-cyan-50 { background-color: #ecfeff; }
.bg-cyan-100 { background-color: #cffafe; }
.bg-cyan-600 { background-color: #0891b2; }
.bg-green-100 { background-color: #dcfce7; }
.bg-green-600 { background-color: #16a34a; }
.bg-gradient-to-r-from-blue-50-to-purple-50 {
    background: linear-gradient(to right, #eff6ff, #faf5ff);
}
.bg-gradient-to-br-from-blue-50-to-purple-50 {
    background: linear-gradient(135deg, #eff6ff, #faf5ff);
}
.bg-gradient-to-r-from-blue-600-to-purple-600 {
    background: linear-gradient(to right, #2563eb, #9333ea);
}
.bg-gradient-to-br-from-blue-50-via-white-to-purple-50 {
    background: linear-gradient(135deg, #eff6ff, #ffffff, #faf5ff);
}

.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-purple-600 { color: #9333ea; }
.text-cyan-600 { color: #0891b2; }
.text-green-600 { color: #16a34a; }
.text-transparent { color: transparent; }

/* Typography */
.text-xs { font-size: 0.75rem; line-height: 1rem; }
.text-sm { font-size: 0.875rem; line-height: 1.25rem; }
.text-base { font-size: 1rem; line-height: 1.5rem; }
.text-lg { font-size: 1.125rem; line-height: 1.75rem; }
.text-xl { font-size: 1.25rem; line-height: 1.75rem; }
.text-2xl { font-size: 1.5rem; line-height: 2rem; }
.text-3xl { font-size: 1.875rem; line-height: 2.25rem; }
.text-4xl { font-size: 2.25rem; line-height: 2.5rem; }
.text-5xl { font-size: 3rem; line-height: 1; }
.text-6xl { font-size: 3.75rem; line-height: 1; }

.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.text-center { text-align: center; }
.uppercase { text-transform: uppercase; }
.tracking-wide { letter-spacing: 0.025em; }

.bg-clip-text { -webkit-background-clip: text; background-clip: text; }

/* Layout */
.block { display: block; }
.inline-block { display: inline-block; }
.inline { display: inline; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }
.hidden { display: none; }

.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-baseline { align-items: baseline; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

.flex-1 { flex: 1 1 0%; }
.flex-shrink-0 { flex-shrink: 0; }

/* Grid */
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.col-span-2 { grid-column: span 2 / span 2; }
.col-span-full { grid-column: 1 / -1; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }
.gap-12 { gap: 3rem; }

/* Spacing */
.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }
.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-8 { padding-left: 2rem; padding-right: 2rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }
.py-12 { padding-top: 3rem; padding-bottom: 3rem; }
.py-16 { padding-top: 4rem; padding-bottom: 4rem; }
.py-20 { padding-top: 5rem; padding-bottom: 5rem; }
.pt-2 { padding-top: 0.5rem; }
.pt-8 { padding-top: 2rem; }
.pb-3 { padding-bottom: 0.75rem; }
.pb-4 { padding-bottom: 1rem; }
.pb-8 { padding-bottom: 2rem; }
.pb-12 { padding-bottom: 3rem; }
.pl-3 { padding-left: 0.75rem; }
.pl-10 { padding-left: 2.5rem; }
.pr-4 { padding-right: 1rem; }

.m-0 { margin: 0; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-12 { margin-bottom: 3rem; }
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: 1rem; }
.mt-8 { margin-top: 2rem; }
.mt-12 { margin-top: 3rem; }
.ml-1 { margin-left: 0.25rem; }
.ml-10 { margin-left: 2.5rem; }
.mr-3 { margin-right: 0.75rem; }
.mx-auto { margin-left: auto; margin-right: auto; }
.max-w-md { max-width: 28rem; }
.max-w-2xl { max-width: 42rem; }
.max-w-3xl { max-width: 48rem; }
.max-w-7xl { max-width: 80rem; }

/* Sizing */
.w-4 { width: 1rem; }
.w-5 { width: 1.25rem; }
.w-6 { width: 1.5rem; }
.w-8 { width: 2rem; }
.w-16 { width: 4rem; }
.w-full { width: 100%; }
.h-4 { height: 1rem; }
.h-5 { height: 1.25rem; }
.h-6 { height: 1.5rem; }
.h-8 { height: 2rem; }
.h-16 { height: 4rem; }
.h-full { height: 100%; }

/* Borders */
.border { border-width: 1px; }
.border-2 { border-width: 2px; }
.border-t { border-top-width: 1px; }
.border-b-2 { border-bottom-width: 2px; }
.border-gray-100 { border-color: #f3f4f6; }
.border-gray-200 { border-color: #e5e7eb; }
.border-gray-300 { border-color: #d1d5db; }
.border-gray-800 { border-color: #1f2937; }
.border-blue-200 { border-color: #bfdbfe; }
.border-blue-600 { border-color: #2563eb; }
.border-red-500 { border-color: #ef4444; }
.border-transparent { border-color: transparent; }

.rounded-lg { border-radius: 0.5rem; }
.rounded-xl { border-radius: 0.75rem; }
.rounded-2xl { border-radius: 1rem; }
.rounded-full { border-radius: 9999px; }

/* Positioning */
.relative { position: relative; }
.absolute { position: absolute; }
.sticky { position: sticky; }
.top-0 { top: 0; }
.inset-y-0 { top: 0; bottom: 0; }
.inset-x-0 { left: 0; right: 0; }
.left-0 { left: 0; }
.z-50 { z-index: 50; }

/* Shadows */
.shadow-sm { box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05); }
.shadow-md { box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06); }
.shadow-lg { box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); }
.shadow-xl { box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04); }

/* Transitions */
.transition-colors { transition-property: color, background-color, border-color, text-decoration-color, fill, stroke; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.transition-all { transition-property: all; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.transition-transform { transition-property: transform; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.duration-300 { transition-duration: 300ms; }

/* Hover Effects */
.hover\:bg-blue-700:hover { background-color: #1d4ed8; }
.hover\:bg-blue-800:hover { background-color: #1e40af; }
.hover\:bg-gray-50:hover { background-color: #f9fafb; }
.hover\:bg-green-700:hover { background-color: #15803d; }
.hover\:text-blue-600:hover { color: #2563eb; }
.hover\:text-blue-800:hover { color: #1e40af; }
.hover\:text-white:hover { color: #ffffff; }
.hover\:border-blue-200:hover { border-color: #bfdbfe; }
.hover\:shadow-md:hover { box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06); }
.hover\:shadow-xl:hover { box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04); }
.hover\:translate-y-1:hover { transform: translateY(-0.25rem); }
.hover\:translate-x-1:hover { transform: translateX(0.25rem); }
.group:hover .group-hover\:translate-x-1 { transform: translateX(0.25rem); }
.group:hover .group-hover\:text-blue-600 { color: #2563eb; }

/* Focus Effects */
.focus\:outline-none:focus { outline: 2px solid transparent; outline-offset: 2px; }
.focus\:border-blue-500:focus { border-color: #3b82f6; }
.focus\:ring-2:focus { box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.5); }

/* Responsive */
@media (min-width: 640px) {
    .sm\:px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
    .sm\:flex-row { flex-direction: row; }
    .sm\:text-base { font-size: 1rem; line-height: 1.5rem; }
}

@media (min-width: 768px) {
    .md\:block { display: block; }
    .md\:hidden { display: none; }
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .md\:text-4xl { font-size: 2.25rem; line-height: 2.5rem; }
    .md\:text-6xl { font-size: 3.75rem; line-height: 1; }
    .md\:text-5xl { font-size: 3rem; line-height: 1; }
    .md\:flex-row { flex-direction: row; }
    .md\:text-xl { font-size: 1.25rem; line-height: 1.75rem; }
    .md\:text-2xl { font-size: 1.5rem; line-height: 2rem; }
}

@media (min-width: 1024px) {
    .lg\:px-8 { padding-left: 2rem; padding-right: 2rem; }
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1280px) {
    .xl\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* Custom Components */
.logo {
    width: 2rem;
    height: 2rem;
    background: linear-gradient(to right, #3b82f6, #9333ea);
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 0.875rem;
}

.nav-link {
    color: #4b5563;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    transition: color 150ms ease-in-out;
}

.nav-link:hover {
    color: #2563eb;
}

.nav-link.active {
    color: #2563eb;
    border-bottom: 2px solid #2563eb;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 2rem;
    border-radius: 0.5rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 150ms ease-in-out;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: #2563eb;
    color: white;
}

.btn-primary:hover {
    background-color: #1d4ed8;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    transform: translateY(-0.25rem);
}

.btn-secondary {
    background-color: white;
    color: #2563eb;
    border: 2px solid #2563eb;
}

.btn-secondary:hover {
    background-color: #f9fafb;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.card {
    background-color: white;
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    border: 1px solid #f3f4f6;
    transition: all 300ms ease-in-out;
}

.card:hover {
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    border-color: #bfdbfe;
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    color: #374151;
    background-color: white;
}

.form-input:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.5);
}

.search-container {
    position: relative;
    max-width: 28rem;
    margin: 0 auto;
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1.25rem;
    height: 1.25rem;
    color: #9ca3af;
}

.search-input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    color: #374151;
    background-color: white;
}

.search-input:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.5);
}

.mobile-menu-btn {
    color: #4b5563;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-btn:hover {
    color: #111827;
}

.mobile-menu {
    background-color: white;
    border-top: 1px solid #e5e7eb;
}

.mobile-menu-link {
    display: block;
    color: #4b5563;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    transition: color 150ms ease-in-out;
}

.mobile-menu-link:hover {
    color: #2563eb;
}

.mobile-menu-link.active {
    color: #2563eb;
}

.feature-icon {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 0.125rem;
    margin-right: 0.75rem;
}

.value-card {
    text-align: center;
    padding: 1.5rem;
    border-radius: 0.75rem;
}

.value-card-icon {
    width: 4rem;
    height: 4rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.footer-link {
    color: #9ca3af;
    text-decoration: none;
    transition: color 150ms ease-in-out;
}

.footer-link:hover {
    color: white;
}

.tool-card {
    background-color: white;
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    border: 1px solid #f3f4f6;
    transition: all 300ms ease-in-out;
}

.tool-card:hover {
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    border-color: #bfdbfe;
}

.tool-card:hover .tool-title {
    color: #2563eb;
}

.tool-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: #111827;
    transition: color 150ms ease-in-out;
}

.tool-category {
    font-size: 0.75rem;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.tool-description {
    color: #4b5563;
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.tool-link {
    display: inline-flex;
    align-items: center;
    color: #2563eb;
    font-weight: 500;
    font-size: 0.875rem;
    text-decoration: none;
    transition: color 150ms ease-in-out;
}

.tool-link:hover {
    color: #1e40af;
}

.tool-link svg {
    width: 1rem;
    height: 1rem;
    margin-left: 0.25rem;
    transition: transform 150ms ease-in-out;
}

.tool-card:hover .tool-link svg {
    transform: translateX(0.25rem);
}

.no-tools {
    text-align: center;
    padding: 3rem 0;
}

.no-tools-icon {
    color: #9ca3af;
    font-size: 3rem;
    margin-bottom: 1rem;
}

.no-tools-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #4b5563;
    margin-bottom: 0.5rem;
}

.no-tools-text {
    color: #6b7280;
}

/* Utility Classes */
.opacity-90 { opacity: 0.9; }
.leading-relaxed { line-height: 1.6; }
.space-x-2 > * + * { margin-left: 0.5rem; }
.space-x-4 > * + * { margin-left: 1rem; }
.space-y-1 > * + * { margin-top: 0.25rem; }
.space-y-2 > * + * { margin-top: 0.5rem; }
.space-y-4 > * + * { margin-top: 1rem; }

/* Form Styles */
.error-message {
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.success-message {
    background-color: #dcfce7;
    color: #16a34a;
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid #bbf7d0;
}

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

/* Print Styles */
@media print {
    .no-print {
        display: none !important;
    }
}