:root {
    /* Color Palette - Dark Theme Default */
    --bg-color: #0f1115;
    --surface-color: #1a1d24;
    --surface-border: #2a2d35;
    --text-primary: #f0f2f5;
    --text-secondary: #9ca3af;
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --success-color: #10b981;
    --error-color: #ef4444;
    
    /* Variables */
    --sidebar-width: 260px;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

body:not(.dark-theme) {
    --bg-color: #f3f4f6;
    --surface-color: #ffffff;
    --surface-border: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #4b5563;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    height: 100vh;
    transition: var(--transition);
    overflow: hidden; /* Prevent body scroll, let internal divs scroll */
}

/* Ad Containers (Placeholder styles) */
.ad-container {
    background-color: var(--surface-color);
    border: 1px dashed var(--surface-border);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.ad-placeholder {
    color: var(--text-secondary);
    font-size: 0.875rem;
    position: absolute;
    z-index: 1;
    pointer-events: none;
}

.ad-top {
    height: 90px;
    width: 100%;
    border-bottom: 1px solid var(--surface-border);
}

.ad-bottom {
    height: 90px;
    width: 100%;
    border-top: 1px solid var(--surface-border);
    margin-top: auto;
}

.ad-sidebar {
    height: 300px;
    width: 100%;
    border-radius: var(--border-radius);
    margin-top: 20px;
}

/* Layout */
.app-container {
    display: flex;
    flex: 1;
    overflow: hidden; /* Contain scrollable children */
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    background-color: var(--surface-color);
    border-right: 1px solid var(--surface-border);
    display: flex;
    flex-direction: column;
    padding: 20px;
    height: 100%;
    overflow-y: auto;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 30px;
}

.logo-icon {
    color: var(--primary-color);
    width: 28px;
    height: 28px;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: transparent;
    border: none;
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
}

.nav-btn:hover {
    background-color: rgba(99, 102, 241, 0.1);
    color: var(--text-primary);
}

.nav-btn.active {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.nav-btn svg {
    width: 20px;
    height: 20px;
}

.sidebar-footer {
    margin-top: auto;
}

.content-wrapper {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 30px 40px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.top-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.tool-title {
    font-size: 1.75rem;
    font-weight: 700;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

.custom-select {
    appearance: none;
    background-color: var(--surface-color);
    border: 1px solid var(--surface-border);
    color: var(--text-primary);
    padding: 8px 32px 8px 16px;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    transition: var(--transition);
}

.custom-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.icon-btn {
    background: var(--surface-color);
    border: 1px solid var(--surface-border);
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.icon-btn:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

.icon-btn svg {
    width: 20px;
    height: 20px;
}

body.dark-theme .moon-icon { display: none; }
body:not(.dark-theme) .sun-icon { display: none; }

/* Tool Container Styles */
.tool-container {
    background-color: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: 0 10px 30px -10px rgba(0,0,0,0.1);
    /* Glassmorphism subtle effect */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* Common Tool UI Elements */
.tool-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

@media (max-width: 900px) {
    .tool-grid {
        grid-template-columns: 1fr;
    }
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    height: 100%;
}

.input-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.input-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.tool-textarea {
    width: 100%;
    min-height: 300px;
    background-color: var(--bg-color);
    border: 1px solid var(--surface-border);
    border-radius: 8px;
    padding: 16px;
    color: var(--text-primary);
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    resize: vertical;
    transition: border-color 0.2s;
}

.tool-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.action-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

.secondary-btn {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--surface-border);
}
.secondary-btn:hover {
    background-color: var(--surface-border);
    color: var(--text-primary);
}

.copy-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
}

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

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.4s ease forwards;
}

/* Responsive */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--surface-border);
    }
    .main-content {
        padding: 20px;
    }
}

/* SEO Content and Footer styles */
.seo-content-block {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--surface-border);
}

.seo-content-block h2 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.seo-content-block h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.seo-content-block p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.seo-faq {
    margin-top: 30px;
}

.faq-item {
    margin-bottom: 20px;
    background-color: var(--bg-color);
    padding: 16px;
    border-radius: 8px;
    border: 1px solid var(--surface-border);
}

.faq-item strong {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.faq-item p {
    margin-bottom: 0;
}

.site-footer {
    background-color: var(--surface-color);
    border-top: 1px solid var(--surface-border);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 16px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    z-index: 10;
}

.site-footer a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.site-footer a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* Toast Notification Styles */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 9999;
    pointer-events: none;
}

.toast {
    background-color: var(--success-color);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    gap: 10px;
    transform: translateX(120%);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast svg {
    width: 20px;
    height: 20px;
}

/* Home Dashboard Styles */
.home-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.tool-card {
    background-color: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
}

.tool-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
}

.tool-card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    border-radius: 12px;
}

.tool-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
}

.tool-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
    flex-grow: 1;
}