/* ============================================
   Argcrux Marketing Site - Design System
   ============================================ */

/* ========== CSS Variables / Design Tokens ========== */
:root {
    /* Colors - Cyan/Turquoise gradient theme */
    --primary-500: #3dc9d6;
    --primary-600: #2ab7c6;
    --primary-700: #1fa5b6;
    --secondary-500: #36b7c6;
    --secondary-600: #28a5b6;

    /* Accent colors */
    --green-500: #10b981;
    --green-600: #059669;
    --red-500: #ef4444;
    --red-600: #dc2626;

    /* Neutrals */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Semantic colors */
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-dark: #0f172a;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;

    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Shadows */
    --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);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== Base Styles ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========== Typography ========== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-500);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-600);
}

/* ========== Layout ========== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-4xl) 0;
}

.section-dark {
    background: linear-gradient(135deg, var(--gray-900) 0%, var(--gray-800) 100%);
    color: white;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-subtitle {
    text-align: center;
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-3xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-dark .section-subtitle {
    color: var(--gray-300);
}

/* ========== Navigation ========== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    padding: var(--spacing-md) 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo img {
    display: block;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--secondary-500) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    color: var(--text-primary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary-500);
}

.nav-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* Mobile navigation */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 73px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        align-items: stretch;
        padding: var(--spacing-lg);
        border-bottom: 1px solid var(--gray-200);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

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

    .nav-link {
        padding: var(--spacing-md) 0;
        border-bottom: 1px solid var(--gray-100);
    }

    .nav-buttons {
        flex-direction: column;
        margin-top: var(--spacing-md);
    }

    .nav-toggle {
        display: flex;
    }
}

/* ========== Buttons ========== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    border: 2px solid transparent;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--secondary-500) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.btn-secondary {
    background: var(--gray-800);
    color: white;
}

.btn-secondary:hover {
    background: var(--gray-700);
    color: white;
}

.btn-secondary-outline {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--gray-300);
}

.btn-secondary-outline:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
}

.btn-outline {
    background: transparent;
    color: var(--primary-500);
    border-color: var(--primary-500);
}

.btn-outline:hover {
    background: var(--primary-500);
    color: white;
}

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

.btn-full {
    width: 100%;
}

/* ========== Hero Section ========== */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg,
        rgba(139, 92, 246, 0.1) 0%,
        rgba(99, 102, 241, 0.1) 50%,
        rgba(16, 185, 129, 0.05) 100%
    );
    z-index: -1;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    padding: var(--spacing-2xl) 0;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, var(--gray-900) 0%, var(--primary-600) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;    
}

.hero-visual {
    margin-top: var(--spacing-3xl);
    padding: var(--spacing-2xl);
}

.tree-illustration {
    max-width: 100%;
    height: auto;
    filter: drop-shadow(0 10px 30px rgba(139, 92, 246, 0.2));
}

.tree-illustration .node {
    animation: fadeInUp 0.6s ease-out forwards;
    opacity: 0;
}

.tree-illustration .node.central {
    animation-delay: 0.1s;
}

.tree-illustration .node.support:nth-of-type(2) {
    animation-delay: 0.3s;
}

.tree-illustration .node.support:nth-of-type(3) {
    animation-delay: 0.5s;
}

.tree-illustration .node.attack:nth-of-type(4) {
    animation-delay: 0.7s;
}

.tree-illustration .node.attack:nth-of-type(5) {
    animation-delay: 0.9s;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== Features Section ========== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-2xl);
}

.feature-card {
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    background: white;
    border: 1px solid var(--gray-200);
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--primary-500);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.feature-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--secondary-500) 100%);
    border-radius: var(--radius-lg);
    color: white;
    margin-bottom: var(--spacing-lg);
}

.feature-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========== Pricing Cards ========== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-3xl);
}

.pricing-card {
    position: relative;
    background: white;
    border-radius: var(--radius-xl);
    padding: 0;
    border: 2px solid var(--gray-200);
    transition: all var(--transition-base);
    overflow: hidden;
}

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

.pricing-card-featured {
    border-color: var(--primary-500);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
}

.pricing-card-featured:hover {
    transform: scale(1.05) translateY(-4px);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--secondary-500) 100%);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 600;
    z-index: 10;
}

.pricing-card-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    position: relative;
}

.pricing-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    display: block;
    transition: transform var(--transition-base);
}

.pricing-card:hover .pricing-card-image img {
    transform: scale(1.05);
}

.pricing-header {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-2xl) var(--spacing-xl);
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: var(--spacing-xl);
}

.pricing-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.pricing-price {
    margin-bottom: var(--spacing-md);
}

.price-amount {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-600);
}

.price-period {
    font-size: 1rem;
    color: var(--text-secondary);
}

.pricing-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--spacing-xl);
    padding: 0 var(--spacing-2xl);
}

.pricing-features li {
    padding: var(--spacing-sm) 0;
    position: relative;
    padding-left: var(--spacing-lg);
}

.pricing-features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--green-500);
    font-weight: bold;
}

.pricing-features li strong {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-600);
}

.pricing-card .btn {
    margin: 0 var(--spacing-2xl) var(--spacing-2xl);
    width: calc(100% - var(--spacing-2xl) * 2);
}

table.features-table {
    width: 100%; 
    min-width: 800px; 
    background: white; 
    border-radius: var(--radius-xl); 
    border-collapse: collapse; 
    overflow: hidden;
}

table.features-table thead > tr {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--secondary-500) 100%);
}
table.features-table tr td,
table.features-table tr th {
    padding: var(--spacing-lg); 
    text-align: center; 
}
table.features-table thead > tr > th {
    color: white; 
    font-weight: 600;
}
table.features-table tbody > tr {
    border-bottom: 1px solid var(--gray-200);
}
table.features-table tbody > tr > td:first-child {
    text-align: left; 
    font-weight: 500;
}

.faq-section {
    max-width: 800px; 
    margin: 0 auto; 
    margin-top: var(--spacing-3xl);
}

.faq-section > div {
    margin-bottom: var(--spacing-2xl);
}

.faq-section h3 {
    color: var(--primary-600); 
    margin-bottom: var(--spacing-md);
}

.faq-section p {
    color: var(--text-secondary); 
    line-height: 1.7;
}

/* ========== Steps / How It Works ========== */
.steps {
    display: grid;
    gap: var(--spacing-3xl);
}

.step {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.step-number {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--secondary-500) 100%);
    color: white;
    border-radius: 50%;
    box-shadow: var(--shadow-md);
}

.step-content {
    flex: 1;
}

.step-title {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
}

.step-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.step-visual {
    margin-top: var(--spacing-lg);
}

.placeholder-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

/* ========== CTA Section ========== */
.cta-section {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--secondary-600) 100%);
    color: white;
}

.cta-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    color: white;
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-lg);
}

.cta-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-2xl);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.cta-section .btn-primary {
    background: white;
    color: var(--primary-600);
}

.cta-section .btn-primary:hover {
    background: var(--gray-100);
}

.cta-section .btn-secondary-outline {
    border-color: white;
    color: white;
}

.cta-section .btn-secondary-outline:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* ========== Footer ========== */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-heading {
    color: white;
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--gray-300);
    transition: color var(--transition-fast);
}

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

.footer-description {
    color: var(--gray-400);
    font-size: 0.95rem;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--gray-800);
    color: var(--gray-500);
}

/* ========== Responsive Design ========== */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }

    .section {
        padding: var(--spacing-3xl) 0;
    }

    .hero {
        min-height: auto;
        padding: var(--spacing-4xl) 0;
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

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

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

    .pricing-card-featured {
        transform: scale(1);
    }

    .step {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .step-number {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
}

/* ========== Utilities ========== */
.text-center {
    text-align: center;
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--secondary-500) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }


.text-container p {
    font-size: 1.125rem; 
    line-height: 1.8; 
    color: var(--text-secondary); 
    margin-bottom: var(--spacing-xl);
}
.text-container ul {
    font-size: 1.125rem; 
    line-height: 1.8; 
    color: var(--text-secondary); 
    padding: 0 3rem;
}