/* UT.ac - Tools CSS
   Replaces Tailwind CSS with custom styles
   Theme: Dark Navy (#0f172a), Slate (#1e293b), Indigo (#6366f1)
*/

:root {
    /* Base Variables (Restored from Original) */
    --bg-color: #0f172a; /* Mapped to new dark theme */
    --text-color: #f8fafc;
    --card-bg: #1e293b;
    --card-hover-bg: #334155;
    --header-bg: #0f172a;
    --footer-bg: #0f172a;
    --primary-color: #6366f1;

    /* New Palette Variables */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;

    --accent-primary: #6366f1;
    --accent-hover: #4f46e5;
    --accent-light: #818cf8;

    --border-color: #334155;

    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    /* Typography */
    --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

[data-theme="light"] {
    --bg-color: #ffffff;
    --text-color: #0f172a;
    --card-bg: #f8fafc;
    --card-hover-bg: #e2e8f0;
    --header-bg: #ffffff;
    --footer-bg: #ffffff;
    --primary-color: #4f46e5;

    /* Remap new palette for light mode */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #e2e8f0;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;

    --border-color: #e2e8f0;
}

/* Reset & Base */
*, ::before, ::after {
    box-sizing: border-box;
    border-width: 0;
    border-style: solid;
    border-color: var(--border-color);
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Restored Components from Original tools.css */
header {
    background-color: var(--header-bg);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

#theme-toggle {
    background: transparent;
    border: 1px solid var(--text-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-radius: 4px;
    border-width: 1px; /* Ensure visibility */
}

/* Main Layout */
main {
    flex: 1;
    padding: 2rem;
    max-width: 1280px; /* Increased to match Tailwind max-w-7xl */
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

h1 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2.25rem;
    font-weight: 700;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.category-card {
    background-color: var(--card-bg);
    color: var(--text-color);
    padding: 2rem;
    text-align: center;
    text-decoration: none;
    border-radius: 8px;
    transition: background-color 0.2s, transform 0.2s;
    font-weight: bold;
    font-size: 1.1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    display: block;
}

.category-card:hover {
    background-color: var(--card-hover-bg);
    transform: translateY(-2px);
}

/* Tailwind Utilities Replacements */

/* Typography Utilities */
h2 { font-size: 1.875rem; font-weight: 700; margin-bottom: 1rem; }
h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 1rem; }
h4 { font-size: 1.25rem; font-weight: 700; margin-bottom: 1rem; }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

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

.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 1.875rem; }
.text-4xl { font-size: 2.25rem; }

/* Text Colors */
.text-slate-200 { color: var(--text-primary); } /* Adaptive */
.text-slate-300 { color: var(--text-primary); opacity: 0.9; }
.text-slate-400 { color: var(--text-secondary); }
.text-slate-500 { color: var(--text-tertiary); }
.text-indigo-400 { color: var(--accent-light); }
.text-indigo-500 { color: var(--accent-primary); }
.text-white { color: var(--text-primary); }

/* Layout Utilities */
.container {
    width: 100%;
    margin-right: auto;
    margin-left: auto;
    padding-right: var(--spacing-md);
    padding-left: var(--spacing-md);
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.flex-1 { flex: 1 1 0%; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }

.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)); }
@media (min-width: 768px) {
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (min-width: 1024px) {
    .lg\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.hidden { display: none !important; }
.block { display: block; }
.inline-flex { display: inline-flex; }

/* Spacing Utilities */
.m-0 { margin: 0; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.mt-12 { margin-top: 3rem; }
.mt-16 { margin-top: 4rem; }
.mt-24 { margin-top: 6rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-12 { margin-bottom: 3rem; }
.mx-auto { margin-left: auto; margin-right: auto; }

.p-3 { padding: 0.75rem; }
.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-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
.px-8 { padding-left: 2rem; padding-right: 2rem; }
.py-1\.5 { padding-top: 0.375rem; padding-bottom: 0.375rem; }
.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-12 { padding-top: 3rem; padding-bottom: 3rem; }

/* Buttons & Inputs */
.btn, button {
    cursor: pointer;
    border: none;
    outline: none;
    transition: all 0.2s ease-in-out;
}

.bg-indigo-600 { background-color: var(--accent-primary); }
.hover\:bg-indigo-500:hover { background-color: var(--accent-hover); }

.rounded-lg { border-radius: var(--radius-md); }
.rounded-xl { border-radius: var(--radius-lg); }
.rounded-2xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1); }

/* Navigation specific */
nav {
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 50;
    width: 100%;
}

.bg-slate-800 { background-color: var(--bg-secondary); }
.bg-slate-900 { background-color: var(--bg-primary); }
.border-slate-700 { border-color: var(--border-color); }
.border-slate-800 { border-color: var(--border-color); }

/* Inputs */
input, select, textarea {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    padding: 0.5rem 0.75rem;
    width: 100%;
    outline: none;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

/* Gradients */
.bg-clip-text {
    -webkit-background-clip: text;
    background-clip: text;
}
.text-transparent { color: transparent; }
.bg-gradient-to-r { background-image: linear-gradient(to right, var(--accent-primary), #22d3ee); }

/* Animations */
.animate-fade-in { animation: fadeIn 0.5s ease-out forwards; }
.animate-fade-in-up { animation: fadeInUp 0.5s ease-out forwards; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* Size Utilities */
.w-full { width: 100%; }
.h-full { height: 100%; }
.h-16 { height: 4rem; }
.w-8 { width: 2rem; }
.h-8 { height: 2rem; }
.w-12 { width: 3rem; }
.h-12 { height: 3rem; }
.w-5 { width: 1.25rem; }
.h-5 { height: 1.25rem; }

.hover\:scale-105:hover { transform: scale(1.05); }
.transform { transform: var(--tw-transform); }
.transition-transform { transition-property: transform; transition-duration: 150ms; }
.transition-colors { transition-property: color, background-color, border-color; transition-duration: 150ms; }
.transition-all { transition-property: all; transition-duration: 150ms; }

/* Prose */
.prose { color: var(--text-secondary); line-height: 1.75; }
.prose h2, .prose h3 { color: var(--text-primary); margin-top: 2em; margin-bottom: 1em; }
.prose ul { list-style-type: disc; padding-left: 1.625em; margin: 1.25em 0; }

/* Footer */
footer {
    background-color: var(--footer-bg);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    margin-top: auto;
    text-align: center;
    color: var(--text-secondary);
}

/* Ad Container Styling */
.ad-container {
    max-width: 896px; /* Matches max-w-4xl commonly used */
    margin: 3rem auto;
    padding: 2rem;
    background-color: var(--bg-secondary);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}