:root {
    /* --- PROFESSIONAL SAAS PALETTE --- */
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #06b6d4;
    
    /* Dark Mode (Default) */
    --bg-main: #0a0b10;
    --bg-surface: #11141d;
    --bg-card: rgba(255, 255, 255, 0.03);
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    
    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.2);
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

[data-theme="light"] {
    --bg-main: #ffffff;
    --bg-surface: #f8fafc;
    --bg-card: #ffffff;
    
    --text-main: #0f172a;
    --text-muted: #64748b;
    
    --border: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(0, 0, 0, 0.15);
}

/* --- RESET & BASE --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    transition: all 0.2s ease;
    text-decoration: none;
    color: inherit;
}

/* --- LAYOUT COMPONENTS --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* MODERN NAV */
.summary-bar {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translate(-50%, 150%);
    width: calc(100% - 40px);
    max-width: 1100px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    padding: 20px 32px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] .summary-bar {
    background: rgba(22, 27, 34, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.summary-bar.visible {
    transform: translate(-50%, 0);
}

.summary-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 30px;
}

.summary-details {
    display: flex;
    align-items: center;
    gap: 40px;
}

.summary-selection {
    display: flex;
    gap: 16px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
}

.summary-selection span {
    background: rgba(0,0,0,0.03);
    padding: 4px 12px;
    border-radius: 6px;
    color: var(--text-main);
}

[data-theme="dark"] .summary-selection span {
    background: rgba(255,255,255,0.05);
}

.summary-totals {
    display: flex;
    gap: 32px;
    border-left: 1px solid var(--border);
    padding-left: 32px;
}

.total-item {
    display: flex;
    flex-direction: column;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    font-weight: 700;
}

.total-item span {
    font-size: 1.5rem;
    color: var(--primary);
    letter-spacing: normal;
    text-transform: none;
    margin-top: 4px;
}

#total-monthly {
    color: #10b981;
}

@media (max-width: 1024px) {
    .summary-details { gap: 20px; }
    .summary-totals { gap: 20px; padding-left: 20px; }
}

@media (max-width: 768px) {
    .summary-bar {
        bottom: 10px;
        width: calc(100% - 20px);
        padding: 16px;
        border-radius: 12px;
    }
    .summary-container {
        flex-direction: column;
        gap: 16px;
    }
    .summary-details {
        flex-direction: column;
        align-items: center;
        gap: 16px;
        width: 100%;
    }
    .summary-totals {
        border-left: none;
        padding-left: 0;
        width: 100%;
        justify-content: center;
    }
    .summary-selection {
        flex-wrap: wrap;
        justify-content: center;
    }
    #btn-complete { width: 100%; }
}
.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 72px;
    display: flex;
    align-items: center;
    background: rgba(10, 11, 16, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 2000;
}

[data-theme="light"] .site-nav {
    background: rgba(255, 255, 255, 0.8);
}

.nav-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    width: 100%;
}

.nav-logo {
    display: flex;
    align-items: center;
    height: 100%;
    text-decoration: none;
    z-index: 50;
}

.nav-logo img {
    height: 64px; /* Increased for better legibility */
    width: auto;
    object-fit: contain;
    pointer-events: none;
    transition: all 0.3s ease;
}

[data-theme="dark"] .nav-logo img {
    filter: brightness(0) invert(1);
}

body[data-theme="light"] .nav-logo img {
    /* Logo has white text parts; force solid black in light mode for perfect legibility */
    filter: brightness(0) !important;
}

.nav-links {
    display: flex;
    gap: 32px;
    margin: 0; /* Centered by grid parent */
}

/* Hide toggle checkbox */
.nav-toggle {
    display: none;
}

/* Mobile Toggle Label */
.nav-toggle-label {
    display: none; /* Hidden by default on desktop */
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
    z-index: 2100;
}

.nav-toggle-label span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--text-main);
    transition: all 0.3s ease;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
}

.nav-links a:hover, 
.nav-links a.active {
    color: var(--primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
}

/* --- BUTTONS --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-ghost {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    background: var(--bg-card);
    border-color: var(--border-hover);
}

/* --- HERO SECTION --- */
.hero {
    padding: 160px 0 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* Subtle background glow for hero */
.hero::before {
    content: '';
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(79, 70, 229, 0.15) 0%, transparent 70%);
    z-index: -1;
    filter: blur(60px);
}

.hero-tag {
    display: inline-block;
    padding: 6px 12px;
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 24px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: 24px;
    background: linear-gradient(to bottom right, var(--text-main) 60%, var(--text-muted));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
}

/* --- FEATURE GRID --- */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.feature-card {
    padding: 32px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* --- FOOTER --- */
.site-footer {
    padding: 80px 0 40px;
    border-top: 1px solid var(--border);
    background: var(--bg-surface);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand h4 {
    margin-bottom: 20px;
}

.footer-col h5 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 24px;
    color: var(--text-main);
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-col ul li a:hover {
    color: var(--primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 40px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* --- CUSTOM PAGES (RESTORED) --- */
.page-header {
    padding: 140px 0 60px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.page-header h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.page-header p {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* --- CONTACT FORM --- */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 60px;
    margin-top: 60px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-main);
}

.form-group input, 
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.2s;
}

.form-group input:focus, 
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.mobile-only {
    display: none !important;
}

/* --- RESPONSIVE --- */
@media (max-width: 1024px) {
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .contact-container { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .hero h1 { font-size: 2.75rem; }
    .grid-3 { grid-template-columns: 1fr; }
    .grid-4 { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
    
    .mobile-only {
        display: flex !important;
    }
    
    .desktop-only {
        display: none !important;
    }
    
    /* Mobile Menu Implementation */
    .nav-toggle-label {
        display: flex;
    }

    .nav-links {
        display: none; /* Hide standard links */
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--bg-surface);
        flex-direction: column;
        align-items: center;
        padding: 40px 0;
        gap: 24px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-xl);
        z-index: 1500;
        margin: 0; /* Reset margins for mobile */
    }

    /* Show links when toggle checked */
    .nav-toggle:checked ~ .nav-links {
        display: flex;
    }

    /* Hamburger to X Transform */
    .nav-toggle:checked ~ .nav-toggle-label span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    .nav-toggle:checked ~ .nav-toggle-label span:nth-child(2) {
        opacity: 0;
    }
    .nav-toggle:checked ~ .nav-toggle-label span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .nav-actions {
        gap: 12px;
    }

    .nav-actions .btn {
        padding: 8px 12px;
        font-size: 0.8rem;
    }

    .btn-primary {
        white-space: normal;
    }

    .nav-actions {
        display: flex !important; /* Force visibility for theme toggle */
        gap: 8px;
        order: 2; /* Ensure it stays right of logo */
    }

    .nav-actions a {
        display: none !important; /* Hide login/get-started links but keep toggle button */
    }
    
    #theme-toggle {
        display: flex !important; /* Ensure the button itself is visible */
    }

    .nav-links {
        display: none;
        position: fixed;
        /* ... existing properties ... */
    }

    .nav-toggle:checked ~ .nav-links {
        display: flex;
    }
    
    /* Mobile-specific nav link action button styling */
    .nav-links .btn {
        width: 80%;
        margin-top: 10px;
    }
}

/* --- PLANS PAGE SPECIFIC --- */
.plans-architecture {
    padding: 140px 0 60px 0; /* Clear fixed header (72px) + top breathing room */
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    text-align: center;
}

[data-theme="dark"] .plans-architecture {
    background: #0d1117;
}

.architecture-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    margin-top: 50px;
    flex-wrap: wrap;
}

.arch-node {
    background: var(--bg-surface);
    padding: 24px 32px;
    border-radius: 12px;
    border: 1px solid var(--border);
    font-weight: 700;
    letter-spacing: 0.05em;
    min-width: 180px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.arch-arrow {
    font-size: 1.5rem;
    color: var(--text-muted);
    font-weight: 300;
}

.pricing-table-container {
    overflow-x: auto;
    margin-top: 40px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--bg-surface);
}

.pricing-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.pricing-table th, 
.pricing-table td {
    padding: 24px;
    border-bottom: 1px solid var(--border);
}

.pricing-table th {
    background: rgba(0,0,0,0.02);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

.tier-name {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-main);
}

.price-tag {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-main);
}

.label-onetime, 
.label-monthly {
    font-size: 0.7rem;
    text-transform: uppercase;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 4px;
    letter-spacing: 0.05em;
}

.label-onetime {
    background: rgba(245, 158, 11, 0.1);
    color: #d97706;
}

.label-monthly { background: rgba(16, 185, 129, 0.1); color: #059669; }

.badge-proactive {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    color: #10b981;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 12px;
}

/* --- COMPREHENSIVE COMPARISON TABLE --- */
.technical-comparison {
    padding: 100px 0;
    background: var(--bg-main);
}

.table-responsive {
    overflow-x: auto;
    background: var(--bg-surface);
    border-radius: 16px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 30px rgba(0,0,0,0.05);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 900px;
}

.comparison-table th, 
.comparison-table td {
    padding: 16px 24px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.comparison-table th {
    background: var(--bg-surface);
    position: sticky;
    top: 0;
    z-index: 10;
}

.comparison-table .feature-name {
    text-align: left;
    font-weight: 600;
    color: var(--text-main);
    width: 320px;
    background: rgba(0,0,0,0.01);
}

[data-theme="dark"] .comparison-table .feature-name {
    background: rgba(255,255,255,0.02);
}

.comparison-table .category-header {
    background: rgba(79, 70, 229, 0.05);
    text-align: left;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.75rem;
    color: var(--primary);
}

.comparison-table tr:hover {
    background: rgba(0,0,0,0.02);
}

[data-theme="dark"] .comparison-table tr:hover {
    background: rgba(255,255,255,0.02);
}

.comparison-table .check { color: #10b981; font-weight: bold; font-size: 1.1rem; }
.comparison-table .cross { color: var(--text-muted); opacity: 0.3; }

/* Highlight Business Column (Recommended) */
.comparison-table td:nth-child(3),
.comparison-table th:nth-child(3) {
    background: rgba(79, 70, 229, 0.02);
}