:root {
    --bg-color: #ffffff;
    --surface-color: #f6f8fa;
    --surface-hover: #f1f5f9;
    --accent-color: #0284c7;
    --accent-hover: #0ea5e9;
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --border-color: #e5e7eb;
    --glass-bg: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(0, 0, 0, 0.05);
    
    --container-width: 1200px;
    --header-height: 80px;
}

/* TEMPORARY LOCKDOWN: Hide navigation until full launch (Remove this to enable) */
.mega-menu-wrapper, .categories { display: none !important; }

html {
    font-size: 16px;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

*, *::before, *::after {
    box-sizing: inherit;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Mobile Performance */
a, button, .btn, .btn-primary, .btn-secondary, .btn-theme, .mega-menu-btn, .category-btn {
    touch-action: manipulation;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
.header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--glass-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.logo-icon {
    width: 2rem;
    height: 2rem;
    color: var(--accent-color);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-speed);
}

.nav-link:hover {
    color: var(--text-primary);
}


/* Hero Section */
.hero {
    padding-top: calc(var(--header-height) + 6rem);
    padding-bottom: 2rem;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -1.5px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

/* Search Bar */
.search-wrapper {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

.search-container {
    position: relative;
    display: flex;
    align-items: center;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 0 1.25rem;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.search-container:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
}

.search-icon {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--text-secondary);
    margin-right: 1rem;
}

#tool-search {
    flex: 1;
    height: 3.5rem;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.1rem;
    outline: none;
}

#tool-search::placeholder {
    color: var(--text-secondary);
}

.autocomplete-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    width: 100%;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    z-index: 100;
    overflow: hidden;
    transition: opacity var(--transition-speed), transform var(--transition-speed);
    text-align: center;
}

.autocomplete-dropdown.hidden {
    display: none;
}

.autocomplete-item {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 1.25rem;
    cursor: pointer;
    transition: background-color var(--transition-speed);
}

.autocomplete-item:hover {
    background-color: var(--surface-hover);
}

.autocomplete-item-icon {
    width: 1.25rem;
    height: 1.25rem;
    margin-right: 1rem;
    color: var(--accent-color);
}

/* Tool Grid Section */
.tools-section {
    padding-bottom: 2rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
}

.categories {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.category-btn {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 1.25rem;
    border-radius: 2rem;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-speed);
}

.category-btn:hover {
    border-color: var(--accent-color);
    color: var(--text-primary);
}

.category-btn.active {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    min-height: 200px;
}

.tool-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 1.25rem;
    padding: 2rem;
    cursor: pointer;
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), border-color 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(99, 102, 241, 0.15), transparent);
    opacity: 0;
    transition: opacity var(--transition-speed);
}

.tool-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-color);
    box-shadow: 0 20px 40px -15px rgba(99, 102, 241, 0.35);
}

.tool-card:hover::before {
    opacity: 1;
}

.tool-card-icon {
    width: 4rem;
    height: 4rem;
    background-color: rgba(99, 102, 241, 0.08);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.tool-card:hover .tool-card-icon {
    background-color: var(--accent-color);
    color: white;
    transform: scale(1.15) rotate(5deg);
    box-shadow: 0 10px 20px -5px rgba(99, 102, 241, 0.5);
}

.tool-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.tool-card-category {
    display: none;
}

.empty-state {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 6rem 4rem;
    border: 2px dashed var(--border-color);
    border-radius: 1.25rem;
    color: var(--text-secondary);
    background-color: rgba(255, 255, 255, 0.02);
}

.empty-icon {
    width: 4rem;
    height: 4rem;
    margin-bottom: 1.5rem;
    opacity: 0.5;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.tool-nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    animation: fadeIn 0.3s ease;
}

.tool-nav.hidden {
    display: none;
}

.breadcrumb-icon {
    width: 1.25rem;
    height: 1.25rem;
    opacity: 0.5;
}

.current-tool-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9rem;
}

/* Tool View Layout */
.tool-view {
    padding-top: calc(var(--header-height) + 2rem);
    padding-bottom: 2rem;
    min-height: 80vh;
}

.tool-view.hidden {
    display: none;
}

.tool-header {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 3rem;
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--transition-speed);
    width: fit-content;
}

.back-btn:hover {
    color: var(--accent-color);
}

.tool-title-group h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

.tool-title-group p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Common Tool Components */
.tool-container {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 2.5rem;
    box-shadow: 0 20px 50px -12px rgba(0, 0, 0, 0.5);
}

@media (max-width: 768px) {
    .tool-container {
        padding: 1.5rem;
    }
}

.tool-ui-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 992px) {
    .tool-ui-grid {
        grid-template-columns: 1fr;
    }
}

.input-label {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.tool-textarea {
    width: 100%;
    height: 300px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.25rem;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    outline: none;
    transition: border-color var(--transition-speed);
}

.tool-textarea:focus {
    border-color: var(--accent-color);
}

.tool-input {
    width: 100%;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1rem 1.25rem;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: border-color var(--transition-speed);
}

.tool-input:focus {
    border-color: var(--accent-color);
}

.tool-controls {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-speed), transform 0.1s;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.btn-secondary:hover {
    border-color: var(--text-secondary);
    background-color: rgba(255, 255, 255, 0.05);
}

/* Stats Display */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.stat-card {
    background-color: rgba(255, 255, 255, 0.03);
    padding: 1.25rem;
    border-radius: 1rem;
    text-align: center;
    border: 1px solid var(--border-color);
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Fix for footer spacing */
.hub-view.hidden {
    display: none;
}

/* Responsive Styles */
@media (max-width: 768px) {
    .header { height: auto; padding: 0.75rem 0; position: fixed; background-color: var(--surface-color); border-bottom: 2px solid var(--accent-color); top: 0; left: 0; width: 100%; z-index: 1001; }
    .nav { flex-direction: column; gap: 0.75rem; align-items: stretch; padding: 0 1rem; }
    .nav-brand { display: flex; justify-content: space-between; align-items: center; width: 100%; }
    .nav-links { 
        width: 100%; 
        display: flex; 
        flex-direction: column; 
        gap: 0.75rem; 
        margin-top: 0.5rem;
    }
    .search-container { width: 100% !important; order: 2; margin-top: 0.5rem; }
    .mega-menu-wrapper { order: 1; width: 100%; }
    #tool-search { height: 3.5rem; font-size: 1rem; width: 100%; background-color: var(--bg-color); }
    
    .hero { padding-top: 15rem; padding-bottom: 2rem; }
    .hero-title { font-size: 2rem; }
    .hero-subtitle { font-size: 1.1rem; margin-bottom: 2rem; }
    
    .tool-view { padding-top: 15rem; }
    .tool-grid { grid-template-columns: 1fr; gap: 1.5rem; }
    
    .invoice-builder-grid { grid-template-columns: 1fr; }
    .tool-ui-grid { grid-template-columns: 1fr; }
}

/* Advertisement Placeholders */
.ad-slot {
    width: 100%;
    background-color: var(--surface-color);
    border: 1px dashed var(--text-secondary);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin: 2rem auto;
    opacity: 0.5;
    text-align: center;
    padding: 1rem;
}
.ad-top, .ad-bottom {
    min-height: 90px;
    margin-bottom: 2rem;
}
.ad-card {
    min-height: 200px;
    margin: 0;
}

/* Mega Menu Styles */
.mega-menu-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.mega-menu-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color var(--transition-speed);
}

.mega-menu-btn:hover {
    color: var(--text-primary);
}

.mega-menu-content {
    position: absolute;
    top: calc(100% + 1.5rem);
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 2rem;
    box-shadow: 0 30px 60px -15px rgba(0,0,0,0.5);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    gap: 1.5rem;
    z-index: 2000;
}

.mega-menu-content > div {
    flex: 1;
    min-width: 160px;
}

.mega-menu-wrapper:hover .mega-menu-content {
    opacity: 1;
    pointer-events: auto;
    top: calc(100% + 0.5rem);
    transform: translateX(-50%) translateY(0);
}

.mega-col-title {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-color);
    margin-bottom: 1rem;
    font-weight: 700;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

.mega-col-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 55vh;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.mega-col-links::-webkit-scrollbar {
    width: 6px;
}
.mega-col-links::-webkit-scrollbar-track {
    background: transparent; 
}
.mega-col-links::-webkit-scrollbar-thumb {
    background: var(--border-color); 
    border-radius: 4px;
}
.mega-col-links::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary); 
}

.mega-col-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.2s;
    padding: 0.25rem 0;
}

.mega-col-link:hover {
    color: var(--text-primary);
    transform: translateX(5px);
}

.mega-col-link i {
    width: 16px;
    height: 16px;
    color: var(--accent-color);
}

@media (max-width: 992px) {
    .mega-menu-content {
        right: -300px;
        min-width: 700px;
    }
}

@media (max-width: 768px) {
    .mega-menu-wrapper {
        width: 100%;
    }
    .mega-menu-btn {
        width: 100%;
        justify-content: space-between;
        padding: 1rem 0;
        border-top: 1px solid var(--border-color);
    }
    .mega-menu-content {
        position: static;
        opacity: 1;
        pointer-events: auto;
        min-width: 100%;
        box-shadow: none;
        border: none;
        padding: 0;
        display: none;
        flex-direction: column;
        transform: none;
        gap: 1.5rem;
        margin-bottom: 1.5rem;
    }
    .mega-menu-content > div {
        min-width: unset;
    }
    .mega-col-links {
        max-height: unset;
        overflow-y: visible;
    }
    .mega-menu-wrapper:hover .mega-menu-content {
        display: flex;
    }
}