/* Velocity 5 Trading Indicator Website Styles */
/* Mobile-first responsive design with CSS Grid and Flexbox */

/* CSS Custom Properties (Variables) */
:root {
    /* Colors */
    --primary-color: #1a365d;
    --primary-light: #2d5a87;
    --primary-dark: #0f2a44;
    --secondary-color: #00d4aa;
    --accent-color: #ff6b35;
    --text-primary: #2d3748;
    --text-secondary: #4a5568;
    --text-light: #718096;
    --background-primary: #ffffff;
    --background-secondary: #f7fafc;
    --background-dark: #1a202c;
    --border-color: #e2e8f0;
    --success-color: #38a169;
    --error-color: #e53e3e;
    --warning-color: #d69e2e;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-secondary: 'Georgia', 'Times New Roman', serif;
    
    /* 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;
    
    /* Breakpoints */
    --mobile-max: 767px;
    --tablet-min: 768px;
    --tablet-max: 1023px;
    --desktop-min: 1024px;
    
    /* Layout */
    --container-max-width: 1200px;
    --section-padding: var(--spacing-xl);
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --box-shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

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

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

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-primary);
    overflow-x: hidden;
}

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

/* Grid System */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

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

.grid-3 {
    grid-template-columns: 1fr;
}

/* Flexbox Utilities */
.flex {
    display: flex;
}

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

.flex-center {
    justify-content: center;
    align-items: center;
}

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

.flex-wrap {
    flex-wrap: wrap;
}

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

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

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

/* Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 48px;
    white-space: nowrap;
}

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

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

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

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

.btn-full {
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Header and Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--box-shadow);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.nav-brand .logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin: 0;
}

.nav-brand .logo-image {
    height: 50px;
    width: auto;
    display: block;
}

.nav-toggle {
    display: flex;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    z-index: 1001;
}

.hamburger {
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

.nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background-color: var(--background-primary);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    list-style: none;
    transition: right 0.3s ease;
    z-index: 999;
}

.nav-menu.active {
    right: 0;
}

.nav-item {
    margin: var(--spacing-md) 0;
}

.nav-link {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

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

.nav-cta {
    background-color: var(--primary-color);
    color: white !important;
}

.nav-toggle.active .hamburger:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active .hamburger:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active .hamburger:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
}

/* Main Content */
.main {
    margin-top: 80px;
}

/* Section Styles */
section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-primary);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--background-secondary) 0%, var(--background-primary) 100%);
    padding: var(--spacing-3xl) 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
}

.highlight {
    color: var(--primary-color);
    position: relative;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.feature-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.feature-icon {
    font-size: 1.5rem;
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

.hero-visual {
    display: block;
    justify-content: center;
    align-items: center;
}

.chart-placeholder {
    width: 300px;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: var(--border-radius);
    display: flex;
    align-items: end;
    justify-content: center;
    padding: var(--spacing-lg);
    box-shadow: var(--box-shadow-lg);
}

.chart-bars {
    display: flex;
    gap: var(--spacing-sm);
    align-items: end;
    height: 100%;
}

.bar {
    width: 20px;
    background-color: var(--secondary-color);
    border-radius: 2px;
    opacity: 0.8;
    transition: all 0.3s ease;
}

.bar:hover {
    opacity: 1;
    transform: scaleY(1.1);
}

/* About Section */
.about {
    background-color: var(--background-primary);
}

.about-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
}

.about-intro {
    font-size: 1.2rem;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-secondary);
}

.about-features {
    display: grid;
    grid-template-columns: 1.5fr;
    gap: var(--spacing-lg);
}

.feature-card {
    background-color: var(--background-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-lg);
}

.feature-title {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.feature-description {
    color: var(--text-secondary);
    margin: 0;
}

.about-specs {
    background-color: var(--background-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

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

.specs-list {
    list-style: none;
    padding: 0;
}

.specs-list li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

.specs-list li::before {
    content: "✓";
    color: var(--success-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* FAQ Section */
.faq {
    background-color: var(--background-secondary);
}

.faq-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--background-primary);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    box-shadow: var(--box-shadow);
}

.faq-question {
    width: 100%;
    padding: var(--spacing-lg);
    background: none;
    border: none;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background-color: var(--background-secondary);
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.6;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
    opacity: 0;
}

.faq-answer.active {
    max-height: 300px;
    padding: var(--spacing-lg);
    opacity: 1;
}

/* Contact Section */
.contact {
    background-color: var(--background-primary);
}

.contact-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.contact-intro {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-secondary);
}

/* Form Styles */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
    background-color: var(--background-primary);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 54, 93, 0.1);
}

.form-input.error,
.form-textarea.error {
    border-color: var(--error-color);
}

.form-input.success,
.form-textarea.success {
    border-color: var(--success-color);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

/* Payment Section */
.payment {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

.payment-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.payment .section-title {
    color: white;
}

.payment-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    max-width: 1000px;
    margin: 0 auto;
}

.price-card {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.price-header {
    margin-bottom: var(--spacing-lg);
}

.price-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: white;
}

.price-amount {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.currency {
    font-size: 1.5rem;
    color: var(--secondary-color);
}

.price-value {
    font-size: 3rem;
    font-weight: 800;
    color: var(--secondary-color);
}

.price-period {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.8);
}

.price-features {
    list-style: none;
    text-align: left;
}

.price-features li {
    padding: var(--spacing-sm) 0;
    position: relative;
    padding-left: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.9);
}

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

.payment-form-section {
    background-color: var(--background-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    box-shadow: var(--box-shadow-lg);
}

.coupon-input-group {
    display: flex;
    gap: var(--spacing-sm);
}

.coupon-input-group .form-input {
    flex: 1;
}

.card-element {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--background-primary);
    transition: border-color 0.3s ease;
}

.card-element:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 54, 93, 0.1);
}

/* Footer */
.footer {
    background-color: var(--background-dark);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-brand h3 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-sm);
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    margin: 0;
}

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

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

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

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    margin: 0;
}

/* Message Styles */
.error-message {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    display: none;
}

.error-message.show {
    display: block;
}

.success-message {
    color: var(--success-color);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    display: none;
}

.success-message.show {
    display: block;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

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

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

.hidden {
    display: none;
}

.visible {
    display: block;
}

/* Responsive Design - Tablet (768px and up) */
@media (min-width: 768px) {
    :root {
        --section-padding: var(--spacing-3xl);
    }
    
    .nav-toggle {
        display: none;
    }
    
    .nav-menu {
        position: static;
        width: auto;
        height: auto;
        background: none;
        flex-direction: row;
        justify-content: flex-end;
        gap: var(--spacing-md);
    }
    
    .nav-item {
        margin: 0;
    }
    
    .nav-link {
        font-size: 1rem;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .grid-2 {
        grid-template-columns: 1fr 1fr;
    }
    
    .hero-container {
        grid-template-columns: 1fr 1fr;
        text-align: left;
    }
    
    .hero-content {
        text-align: left;
    }
    
    .hero-subtitle {
        margin-left: 0;
        margin-right: 0;
    }
    
    .hero-features {
        flex-direction: row;
        justify-content: flex-start;
    }
    
    .hero-actions {
        flex-direction: row;
        justify-content: flex-start;
    }
    
    .about-features {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        grid-template-columns: 2fr 1fr;
    }
    
    .payment-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
    
    .coupon-input-group {
        max-width: 300px;
    }
}

/* Responsive Design - Desktop (1024px and up) */
@media (min-width: 1024px) {
    .hero-title {
        font-size: 3.5rem;
    }
    
    .section-title {
        font-size: 2.5rem;
    }
    
    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .about-features {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .hero-features {
        justify-content: flex-start;
        gap: var(--spacing-xl);
    }
    
    .chart-placeholder {
        width: 400px;
        height: 250px;
    }
}

/* Animation and Transitions */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Focus and Accessibility */
.btn:focus,
.form-input:focus,
.form-textarea:focus,
.nav-link:focus,
.faq-question:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}