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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #60a5fa;
    --secondary: #10b981;
    --secondary-dark: #059669;
    --accent: #8b5cf6;
    --dark: #0f172a;
    --light: #f8fafc;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    --transition: all 0.3s ease;
}

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(--gray-800);
    background-color: white;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--dark);
    margin-bottom: 1rem;
}

h1 {
    font-size: 3.5rem;
    font-weight: 800;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.875rem;
}

h4 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
}

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

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

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
}

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

.btn-secondary {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

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

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

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
}

.logo i {
    color: var(--primary);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-700);
    cursor: pointer;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--gray-700);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    padding: 5rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    color: white;
    margin-bottom: 1.5rem;
}

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

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    gap: 3rem;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: white;
}

.stat-label {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

.hero-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-2xl);
}

.hero-card .card-header {
    margin-bottom: 1.5rem;
}

.hero-card h3 {
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.demo-input {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.card-result {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--gray-200);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.result-item:last-child {
    margin-bottom: 0;
}

.result-item code {
    background: var(--gray-100);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ==========================================================================
   Sections
   ========================================================================== */
.section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    margin-bottom: 1rem;
}

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

/* ==========================================================================
   Features
   ========================================================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

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

/* ==========================================================================
   Steps
   ========================================================================== */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
}

/* ==========================================================================
   CTA Section
   ========================================================================== */
.cta {
    background: linear-gradient(135deg, var(--dark), var(--gray-900));
    color: white;
    text-align: center;
}

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

.cta p {
    color: rgba(255, 255, 255, 0.8);
    max-width: 600px;
    margin: 0 auto 2rem;
}

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

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    color: white;
    margin-bottom: 1.5rem;
}

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

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section ul li a {
    color: var(--gray-400);
}

.footer-section ul li a:hover {
    color: white;
}

.footer-section .logo {
    color: white;
    margin-bottom: 1rem;
}

.footer-section p {
    color: var(--gray-400);
    margin-bottom: 1.5rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-800);
    color: var(--gray-500);
}

/* ==========================================================================
   Track Page Specific Styles
   ========================================================================== */
.track-section {
    padding: 3rem 0 5rem;
}

.tracker-container {
    max-width: 800px;
    margin: 0 auto;
}

.tracker-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 3rem;
    box-shadow: var(--shadow-xl);
}

.tracker-input-group {
    margin-bottom: 2rem;
}

.tracker-input {
    width: 100%;
    padding: 1.25rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-family: 'Courier New', monospace;
    margin-bottom: 1rem;
    transition: var(--transition);
}

.tracker-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.tracker-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.loading {
    text-align: center;
    padding: 3rem;
    display: none;
}

.spinner {
    border: 4px solid var(--gray-200);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
    margin: 0 auto 1.5rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.results-container {
    margin-top: 3rem;
    display: none;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--gray-200);
}

.export-buttons {
    display: flex;
    gap: 0.5rem;
}

.export-btn {
    padding: 0.5rem 1rem;
    background: var(--gray-100);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.export-btn:hover {
    background: var(--gray-200);
}

.chain-steps {
    margin-top: 2rem;
}

.chain-step {
    background: var(--gray-50);
    border-left: 4px solid var(--primary);
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.chain-step:hover {
    transform: translateX(5px);
}

.chain-step.final {
    border-left-color: var(--success);
    background: linear-gradient(135deg, #f0fdf4, var(--gray-50));
}

.step-number {
    display: inline-block;
    background: var(--primary);
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    text-align: center;
    line-height: 32px;
    font-weight: 600;
    margin-right: 1rem;
}

.final .step-number {
    background: var(--success);
}

.step-url {
    font-family: 'Courier New', monospace;
    word-break: break-all;
    margin-bottom: 0.5rem;
}

.step-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--gray-600);
}

.error-container {
    background: #fef2f2;
    border-left: 4px solid var(--danger);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin-top: 2rem;
    display: none;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 1024px) {
    h1 {
        font-size: 3rem;
    }
    
    h2 {
        font-size: 2.25rem;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .hero-text {
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .tracker-card {
        padding: 2rem;
    }
    
    .tracker-buttons {
        flex-direction: column;
    }
    
    .tracker-buttons .btn {
        width: 100%;
    }
    
    .results-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .section {
        padding: 3rem 0;
    }
    
    .hero {
        padding: 3rem 0;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .features-grid,
    .steps-grid {
        grid-template-columns: 1fr;
    }
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }

.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

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