/* ========================================
   Links2RSS - Design System & Styles
   Dark Mode SaaS Design
   ======================================== */

/* CSS Variables */
:root {
    /* Brand Colors (from logo) */
    --color-primary: #E67E22;          /* Orange from logo */
    --color-primary-light: #F39C12;
    --color-primary-dark: #D35400;
    --color-secondary: #1E3A5F;        /* Navy blue from logo */
    --color-secondary-light: #2C5282;
    
    /* Dark Theme */
    --color-bg-primary: #0D1117;       /* Deep dark background */
    --color-bg-secondary: #161B22;     /* Card backgrounds */
    --color-bg-tertiary: #21262D;      /* Elevated elements */
    --color-bg-hover: #30363D;         /* Hover states */
    
    /* Text Colors */
    --color-text-primary: #F0F6FC;
    --color-text-secondary: #8B949E;
    --color-text-muted: #6E7681;
    --color-text-link: #E67E22;
    
    /* Borders */
    --color-border: #30363D;
    --color-border-light: #21262D;
    
    /* Status Colors */
    --color-success: #3FB950;
    --color-warning: #D29922;
    --color-error: #F85149;
    --color-info: #58A6FF;
    
    /* Category Colors */
    --color-cat-rss: #F97316;
    --color-cat-url: #3B82F6;
    --color-cat-sitemap: #10B981;
    --color-cat-seo: #8B5CF6;
    --color-cat-pro: #EC4899;
    
    /* Typography */
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.3);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.5), 0 8px 10px -6px rgb(0 0 0 / 0.4);
    --shadow-glow: 0 0 20px rgb(230 126 34 / 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Container */
    --container-max: 1280px;
    --container-padding: var(--space-6);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: inherit;
    text-decoration: none;
}

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

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

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Section */
.section {
    padding: var(--space-20) 0;
}

.section-alt {
    background-color: var(--color-bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--space-3);
    color: var(--color-text-primary);
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.section-cta {
    text-align: center;
    margin-top: var(--space-10);
}

/* ========================================
   Header & Navigation
   ======================================== */

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(13, 17, 23, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-light);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 36px;
    width: auto;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

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

.dropdown-arrow {
    transition: transform var(--transition-fast);
}

/* Dropdown Menu */
.nav-dropdown {
    position: relative;
}

.dropdown-trigger {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-1);
    transition: color var(--transition-fast);
}

.dropdown-trigger:hover {
    color: var(--color-text-primary);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding-top: var(--space-2);
    display: none;
    min-width: 720px;
}

.dropdown-menu::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: var(--space-2);
    background: transparent;
}

.dropdown-menu-inner {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-4);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
    box-shadow: var(--shadow-xl);
}

.nav-dropdown:hover .dropdown-menu,
.dropdown-menu:hover {
    display: block;
}

.nav-dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.dropdown-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    padding: var(--space-2) var(--space-3);
}

.dropdown-item {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.dropdown-item:hover {
    background-color: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.badge {
    font-size: 0.625rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-full);
    background-color: var(--color-primary);
    color: white;
}

/* Nav Actions */
.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
}

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

/* ========================================
   Buttons
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: 0.9375rem;
    font-weight: 600;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-light);
    box-shadow: var(--shadow-glow);
}

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

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

.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

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

.btn-ghost {
    background-color: transparent;
    color: var(--color-text-secondary);
}

.btn-ghost:hover {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    position: relative;
    padding: var(--space-24) 0 var(--space-20);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-gradient {
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 150%;
    height: 100%;
    background: radial-gradient(ellipse at center, rgba(230, 126, 34, 0.15) 0%, transparent 60%);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(48, 54, 61, 0.3) 1px, transparent 1px),
        linear-gradient(90deg, rgba(48, 54, 61, 0.3) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: linear-gradient(to bottom, white 0%, transparent 80%);
    -webkit-mask-image: linear-gradient(to bottom, white 0%, transparent 80%);
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-primary);
    background-color: rgba(230, 126, 34, 0.1);
    border: 1px solid rgba(230, 126, 34, 0.3);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-6);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background-color: var(--color-primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-6);
    letter-spacing: -0.02em;
}

.hero-title-accent {
    display: block;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4);
}

/* ========================================
   Category Cards
   ======================================== */

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
}

.category-card {
    position: relative;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.category-card:hover {
    border-color: var(--color-text-muted);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.category-card-pro {
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.1) 0%, var(--color-bg-secondary) 100%);
    border-color: rgba(236, 72, 153, 0.3);
}

.category-card-pro:hover {
    border-color: rgba(236, 72, 153, 0.5);
}

.category-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.category-icon-rss {
    background-color: rgba(249, 115, 22, 0.15);
    color: var(--color-cat-rss);
}

.category-icon-url {
    background-color: rgba(59, 130, 246, 0.15);
    color: var(--color-cat-url);
}

.category-icon-sitemap {
    background-color: rgba(16, 185, 129, 0.15);
    color: var(--color-cat-sitemap);
}

.category-icon-seo {
    background-color: rgba(139, 92, 246, 0.15);
    color: var(--color-cat-seo);
}

.category-icon-pro {
    background-color: rgba(236, 72, 153, 0.15);
    color: var(--color-cat-pro);
}

.category-pro-badge {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    background-color: var(--color-cat-pro);
    color: white;
}

.category-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.category-description {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
    flex-grow: 1;
}

.category-count {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

/* ========================================
   Tool Cards
   ======================================== */

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-5);
}

.tool-card {
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.tool-card:hover {
    border-color: var(--color-primary);
    background-color: var(--color-bg-hover);
}

.tool-card-featured {
    background: linear-gradient(135deg, rgba(230, 126, 34, 0.1) 0%, var(--color-bg-tertiary) 100%);
    border-color: rgba(230, 126, 34, 0.3);
}

.tool-card-featured:hover {
    border-color: var(--color-primary);
}

.tool-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-3);
}

.tool-icon {
    width: 44px;
    height: 44px;
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
}

.tool-badge {
    font-size: 0.625rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
}

.tool-badge-popular {
    background-color: rgba(230, 126, 34, 0.15);
    color: var(--color-primary);
}

.tool-badge-login {
    background-color: rgba(139, 92, 246, 0.15);
    color: var(--color-cat-seo);
}

.tool-title {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.tool-description {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* ========================================
   Promo Cards (Cross-Promotion)
   ======================================== */

.promo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-5);
}

.promo-card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
    align-items: center;
}

.promo-card:hover {
    border-color: var(--color-text-muted);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.promo-logo {
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-2);
}

.promo-logo img {
    max-height: 100%;
    width: auto;
    max-width: 90%;
    object-fit: contain;
}

.promo-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.promo-description {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
    flex-grow: 1;
}

.promo-link {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    transition: color var(--transition-fast);
}

.promo-card:hover .promo-link {
    color: var(--color-primary-light);
}

/* ========================================
   CTA Section
   ======================================== */

.cta-card {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-tertiary) 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-12);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-10);
    align-items: center;
}

.cta-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--space-4);
}

.cta-description {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
    line-height: 1.6;
}

.cta-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.cta-feature {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

.cta-feature svg {
    color: var(--color-success);
    flex-shrink: 0;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-10);
    margin-bottom: var(--space-12);
}

.footer-brand {
    max-width: 280px;
}

.footer-logo {
    height: 32px;
    width: auto;
    margin-bottom: var(--space-4);
    /* Note: Logo should have transparent background */
}

.footer-tagline {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-heading {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

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

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-border);
}

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

.footer-products {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.footer-products a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 1024px) {
    .dropdown-menu {
        grid-template-columns: repeat(2, 1fr);
        min-width: 500px;
    }
    
    .cta-card {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .cta-features {
        align-items: center;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: var(--space-4);
    }
    
    .nav-menu,
    .nav-actions {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero {
        padding: var(--space-16) 0 var(--space-12);
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-description {
        font-size: 1.0625rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .section {
        padding: var(--space-12) 0;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .category-grid,
    .tools-grid,
    .promo-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-card {
        padding: var(--space-8);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
    
    .footer-products {
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* ========================================
   Utility Classes
   ======================================== */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

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

.text-muted {
    color: var(--color-text-muted);
}