:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-primary: #6366f1;
    --accent-secondary: #06b6d4;
    --border-color: rgba(255, 255, 255, 0.1);
    --input-bg: #1e293b;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
    --bg-color: #f1f5f9;
    --card-bg: rgba(255, 255, 255, 0.8);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent-primary: #4f46e5;
    --accent-secondary: #0891b2;
    --border-color: rgba(0, 0, 0, 0.1);
    --input-bg: #ffffff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    transition: var(--transition);
    line-height: 1.6;
    min-height: 100vh;
}

/* Header */
header {
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
    letter-spacing: -1px;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--card-bg);
}

/* Container */
.main-container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
}

.hero h1 {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 3rem;
    letter-spacing: -1px;
    margin-bottom: 1rem;
}

.hero p {
    color: var(--text-secondary);
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Search Bar */
.search-container {
    margin-bottom: 3rem;
    position: relative;
}

.search-input {
    width: 100%;
    padding: 1rem 1.5rem;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1.1rem;
    transition: var(--transition);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

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

.tool-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.tool-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.05);
}

.tool-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.tool-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.category-tag {
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-primary);
    border-radius: 20px;
    align-self: flex-start;
}

/* Tool Page Specific */
.tool-header {
    margin-bottom: 2rem;
}

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

@media (min-width: 1024px) {
    .tool-io-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.io-box {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.io-box label {
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
}

textarea {
    width: 100%;
    height: 300px;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    padding: 1rem;
    font-size: 1rem;
    resize: vertical;
    transition: var(--transition);
    font-family: 'Roboto Mono', monospace;
}

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

.button-group {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    filter: brightness(1.1);
}

.btn-secondary {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--border-color);
}

/* Ad Placeholders */
.ad-section {
    width: 100%;
    min-height: 100px;
    background: var(--card-bg);
    border: 1px dashed var(--border-color);
    margin: 2rem 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border-radius: 12px;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* FAQ Section */
.faq-section {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.faq-item {
    margin-bottom: 2rem;
}

.faq-item h4 {
    margin-bottom: 0.5rem;
    color: var(--accent-secondary);
}

/* Footer */
footer {
    margin-top: 4rem;
    padding: 3rem 2rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
}

/* Tool Options */
.options-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    margin: 2rem 0;
}

.options-title {
    font-size: 0.8rem;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--accent-secondary);
    margin-bottom: 1.5rem;
    letter-spacing: 1px;
}

.option-group {
    margin-bottom: 1.5rem;
}

.option-label {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: 600;
    font-size: 0.9rem;
}

/* Segmented Control */
.segmented-control {
    display: flex;
    background: var(--input-bg);
    padding: 4px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.segmented-control input {
    display: none;
}

.segmented-control label {
    flex: 1;
    padding: 0.6rem 1rem;
    text-align: center;
    cursor: pointer;
    border-radius: 8px;
    transition: var(--transition);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.segmented-control input:checked + label {
    background: var(--accent-primary);
    color: white;
}

/* Checkbox Grid */
.option-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1rem;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.75rem 1rem;
    background: var(--input-bg);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.checkbox-item:hover {
    border-color: var(--accent-primary);
}

.checkbox-item input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.checkbox-item span {
    font-size: 0.9rem;
}

/* Utility Classes */
.mt-2 { margin-top: 2rem; }
.hidden { display: none; }

/* Breadcrumbs */
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    flex-wrap: wrap;
}

.breadcrumbs a {
    color: var(--accent-secondary);
    text-decoration: none;
}

.breadcrumbs a:hover {
    text-decoration: underline;
}

.breadcrumbs .separator {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.breadcrumbs .current {
    color: var(--text-primary);
}

/* Site Navigation */
.site-nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.site-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.site-nav a:hover {
    color: var(--accent-primary);
}

/* Content Sections */
.content-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

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

/* Steps / How-To */
.steps-container {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.step-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    transition: var(--transition);
}

.step-item:hover {
    border-color: var(--accent-primary);
}

.step-number {
    background: var(--accent-primary);
    color: white;
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1rem;
    margin-bottom: 0.3rem;
    color: var(--accent-secondary);
}

.step-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Benefits List */
.benefits-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.benefits-list li {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    position: relative;
    padding-left: 2.5rem;
}

.benefits-list li::before {
    content: "✓";
    position: absolute;
    left: 1rem;
    top: 1.25rem;
    color: var(--accent-primary);
    font-weight: 800;
}

/* Homepage Features Section */
.features-section {
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 1px solid var(--border-color);
}

.features-section h2 {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 2.5rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent-primary);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Hero subtitle */
.hero-subtitle {
    font-size: 1.3rem;
    color: var(--accent-secondary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Footer */
.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    text-align: left;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.footer-section h4 {
    color: var(--text-primary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-section p {
    font-size: 0.85rem;
    line-height: 1.6;
}

.footer-section a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--accent-primary);
}

.footer-bottom {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Static Pages (About, Privacy, Terms, Contact) */
.static-page {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

.static-page h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.static-page h2 {
    font-size: 1.3rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--accent-secondary);
}

.static-page h3 {
    font-size: 1.1rem;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.static-page p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.static-page ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.static-page ul li {
    margin-bottom: 0.5rem;
}

.static-page a {
    color: var(--accent-secondary);
}

/* Contact Cards */
.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.contact-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
}

.contact-card h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--accent-secondary);
}

.contact-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

.contact-card a {
    color: var(--accent-primary);
    text-decoration: none;
}

.contact-card a:hover {
    text-decoration: underline;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.2rem; }
    .nav-container { padding: 1rem; }
    .main-container { padding: 1rem; }
    .site-nav { gap: 0.8rem; }
    .site-nav a { font-size: 0.8rem; }
    .features-grid { grid-template-columns: 1fr; }
    .footer-content { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
    .site-nav { display: none; }
    .footer-content { grid-template-columns: 1fr; }
    .benefits-list { grid-template-columns: 1fr; }
}