/* ===== CSS Variables ===== */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #64748b;
    --accent-color: #0ea5e9;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

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

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

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* ===== Header & Navigation ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: var(--radius-md);
    font-weight: 700;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background-color: var(--bg-tertiary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-fast);
}

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-fast);
    padding: 0.5rem;
    z-index: 100;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: block;
    padding: 0.625rem 1rem;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.dropdown-menu a:hover {
    background-color: var(--bg-tertiary);
    color: var(--primary-color);
}

/* ===== Hero Section ===== */
.hero {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-primary), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* ===== Quick Tool Section ===== */
.quick-tool {
    padding: 4rem 0;
    background-color: var(--bg-primary);
}

.main-tool {
    max-width: 800px;
    margin: 0 auto;
}

.tool-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    transition: all var(--transition-normal);
}

.tool-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.tool-card h2 {
    margin-bottom: 0.5rem;
}

.tool-card > p {
    margin-bottom: 1.5rem;
}

textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    transition: border-color var(--transition-fast);
    background-color: var(--bg-secondary);
}

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

textarea::placeholder {
    color: var(--text-muted);
}

.quick-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.stat-item {
    text-align: center;
    padding: 1rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

.stat-number {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ===== Tools Section ===== */
.tools-section {
    padding: 5rem 0;
    background-color: var(--bg-secondary);
}

.section-title {
    text-align: center;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 3rem;
}

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

.tools-grid .tool-card {
    display: block;
    text-align: center;
}

.tool-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
}

.tools-grid .tool-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.tools-grid .tool-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 0;
}

/* ===== Features Section ===== */
.features-section {
    padding: 5rem 0;
    background-color: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-item {
    text-align: center;
    padding: 2rem;
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background-color: var(--bg-tertiary);
    color: var(--primary-color);
    border-radius: 50%;
    margin-bottom: 1rem;
}

.feature-item h3 {
    margin-bottom: 0.5rem;
    font-size: 1.125rem;
}

.feature-item p {
    color: var(--text-muted);
    font-size: 0.9375rem;
    margin-bottom: 0;
}

/* ===== Articles Section ===== */
.articles-section {
    padding: 5rem 0;
    background-color: var(--bg-secondary);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.article-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.article-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.article-card a {
    display: block;
}

.article-image {
    aspect-ratio: 16/9;
    background-color: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.article-content {
    padding: 1.5rem;
}

.article-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--bg-tertiary);
    color: var(--primary-color);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    margin-bottom: 0.75rem;
}

.article-card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.article-card:hover h3 {
    color: var(--primary-color);
}

.article-card p {
    font-size: 0.9375rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.article-date {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* ===== CTA Section ===== */
.cta-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    text-align: center;
    color: white;
}

.cta-section h2 {
    color: white;
    margin-bottom: 1rem;
}

.cta-section p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

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

.cta-section .btn-primary:hover {
    background-color: var(--bg-secondary);
}

/* ===== Footer ===== */
.footer {
    background-color: var(--text-primary);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand p {
    color: var(--text-muted);
    margin-top: 1rem;
    font-size: 0.9375rem;
}

.footer-brand .logo {
    color: white;
}

.footer-brand .logo-icon {
    background: linear-gradient(135deg, var(--primary-light), var(--accent-color));
}

.footer-links h4 {
    color: white;
    font-size: 1rem;
    margin-bottom: 1.25rem;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin: 0;
}

/* ===== Tool Pages ===== */
.tool-page-header {
    padding: 3rem 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    text-align: center;
}

.tool-page-header h1 {
    font-size: 2.25rem;
    margin-bottom: 0.75rem;
}

.tool-page-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.tool-container {
    padding: 3rem 0;
}

.tool-main {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin-bottom: 2rem;
}

.tool-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.tool-output {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    min-height: 100px;
}

.tool-output pre {
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: 'SF Mono', Monaco, Consolas, monospace;
    font-size: 0.9375rem;
    color: var(--text-primary);
}

/* ===== Blog Pages ===== */
.blog-header {
    padding: 3rem 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    text-align: center;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 3rem 0;
}

.blog-post {
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem 0;
}

.blog-post-header {
    margin-bottom: 2rem;
}

.blog-post-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.blog-post h1 {
    font-size: 2.25rem;
    margin-bottom: 1rem;
}

.blog-post-content {
    font-size: 1.0625rem;
    line-height: 1.8;
}

.blog-post-content h2 {
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.blog-post-content h3 {
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.blog-post-content p {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
}

.blog-post-content ul,
.blog-post-content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.blog-post-content li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.blog-post-content ul li {
    list-style-type: disc;
}

.blog-post-content ol li {
    list-style-type: decimal;
}

.blog-post-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: var(--text-muted);
}

.blog-post-content code {
    background-color: var(--bg-tertiary);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-family: 'SF Mono', Monaco, Consolas, monospace;
    font-size: 0.875em;
}

.blog-post-content pre {
    background-color: var(--text-primary);
    color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    overflow-x: auto;
    margin: 1.5rem 0;
}

.blog-post-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

/* ===== About & Contact Pages ===== */
.page-header {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

.page-content {
    padding: 4rem 0;
    max-width: 800px;
    margin: 0 auto;
}

.page-content h2 {
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.page-content p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

/* Contact Form */
.contact-form {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.contact-info {
    margin-top: 3rem;
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.contact-info-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: var(--bg-tertiary);
    color: var(--primary-color);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.contact-info-content h4 {
    margin-bottom: 0.25rem;
}

.contact-info-content p {
    margin: 0;
    color: var(--text-muted);
}

/* ===== Legal Pages ===== */
.legal-content {
    padding: 4rem 0;
    max-width: 800px;
    margin: 0 auto;
}

.legal-content h2 {
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.legal-content h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-size: 1.125rem;
}

.legal-content p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.legal-content ul {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.legal-content li {
    margin-bottom: 0.5rem;
    list-style-type: disc;
    color: var(--text-secondary);
}

.last-updated {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 2rem;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
    padding: 1rem 0;
    font-size: 0.875rem;
}

.breadcrumb ul {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumb li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--text-secondary);
}

.breadcrumb a:hover {
    color: var(--primary-color);
}

.breadcrumb li:not(:last-child)::after {
    content: '/';
    color: var(--text-muted);
}

/* ===== Ad Placeholders ===== */
.ad-placeholder {
    background-color: var(--bg-tertiary);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    margin: 2rem 0;
}

.ad-placeholder.horizontal {
    min-height: 90px;
}

.ad-placeholder.rectangle {
    min-height: 250px;
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--bg-primary);
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
        display: none;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-link {
        width: 100%;
        padding: 1rem;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        background-color: var(--bg-secondary);
        margin-top: 0.5rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .quick-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .tools-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }

    .tool-card {
        padding: 1.5rem;
    }

    .quick-stats {
        grid-template-columns: 1fr;
    }

    .tool-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}

/* ===== Utility Classes ===== */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.hidden { display: none !important; }
.visible { display: block !important; }

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

.fade-in {
    animation: fadeIn 0.3s ease forwards;
}

/* ===== Print Styles ===== */
@media print {
    .header,
    .footer,
    .nav-toggle,
    .ad-placeholder,
    .cta-section {
        display: none;
    }

    body {
        font-size: 12pt;
        color: black;
    }

    a {
        color: black;
        text-decoration: underline;
    }
}