/* ========================================
   Upkeep Landing Page Styles
   Dark theme with electric accents (no gradients)
   ======================================== */

/* CSS Custom Properties */
:root {
    /* Colors - Dark Theme with Electric Accents */
    --color-bg-primary: #0a0a0b;
    --color-bg-secondary: #111113;
    --color-bg-tertiary: #1a1a1d;
    --color-bg-card: #16161a;
    
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0a5;
    --color-text-muted: #6b6b70;
    
    --color-accent-primary: #00E5A0;
    --color-accent-secondary: #FF6B6B;
    --color-accent-tertiary: #4ECDC4;
    
    --color-border: #2a2a2e;
    --color-border-light: #3a3a3e;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-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;
    --spacing-4xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(0, 229, 160, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

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

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

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

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

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

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.btn:hover {
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-primary:hover {
    box-shadow: 0 4px 20px rgba(0, 229, 160, 0.4);
}

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

.btn-secondary:hover {
    background-color: var(--color-border);
    box-shadow: var(--shadow-md);
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1.1rem;
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.9rem;
}

.btn-icon {
    width: 20px;
    height: 20px;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(10, 10, 11, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 800;
}

.logo-icon {
    font-size: 1.75rem;
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-2xl);
}

.nav-links a {
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.nav-links .btn {
    margin-left: var(--spacing-md);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

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

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    background-color: var(--color-bg-primary);
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
    padding: var(--spacing-4xl) 0;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

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

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-xl);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    max-width: 500px;
    margin-bottom: var(--spacing-2xl);
}

.hero-subtitle strong {
    color: var(--color-accent-secondary);
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-3xl);
}

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

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

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

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

.stat-divider {
    width: 1px;
    height: 40px;
    background-color: var(--color-border);
}

/* Phone Mockup */
.hero-visual {
    display: flex;
    justify-content: center;
}

.phone-mockup {
    width: 320px;
    background-color: var(--color-bg-card);
    border-radius: 40px;
    padding: 12px;
    border: 3px solid var(--color-border);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.phone-screen {
    background-color: var(--color-bg-primary);
    border-radius: 30px;
    overflow: hidden;
}

.app-preview {
    padding: var(--spacing-xl);
}

.preview-header {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-md);
}

.preview-steps {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

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

.step-count {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-accent-primary);
}

.step-target {
    font-size: 1.25rem;
    color: var(--color-text-muted);
}

.preview-progress {
    margin-bottom: var(--spacing-lg);
}

.progress-bar {
    height: 8px;
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background-color: var(--color-accent-primary);
    border-radius: var(--radius-full);
    transition: width 1s ease;
}

.progress-text {
    font-size: 0.875rem;
    color: var(--color-accent-primary);
    font-weight: 500;
}

.preview-week {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.day {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    background-color: var(--color-bg-tertiary);
}

.day.completed {
    background-color: var(--color-accent-primary);
    color: var(--color-bg-primary);
    font-weight: 600;
}

.day.current {
    border: 2px solid var(--color-accent-primary);
    background-color: transparent;
}

.preview-challenge {
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
}

.challenge-name {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.challenge-meta {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.challenge-pot {
    font-size: 0.875rem;
    color: var(--color-accent-primary);
}

/* ========================================
   How It Works Section
   ======================================== */
.how-it-works {
    padding: var(--spacing-4xl) 0;
    background-color: var(--color-bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.step-card {
    background-color: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    border: 1px solid var(--color-border);
    position: relative;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.step-number {
    font-size: 4rem;
    font-weight: 800;
    color: var(--color-bg-tertiary);
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-xl);
    line-height: 1;
}

.step-icon-wrapper {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.step-emoji {
    font-size: 2rem;
}

.step-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

.step-description {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ========================================
   Features Section
   ======================================== */
.features {
    padding: var(--spacing-4xl) 0;
    background-color: var(--color-bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.feature-card {
    background-color: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-2px);
    border-color: var(--color-border-light);
}

.feature-card.feature-main {
    grid-column: span 1;
    grid-row: span 2;
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-accent-primary);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
}

.feature-title {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.feature-description {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.feature-list {
    margin-top: var(--spacing-lg);
    list-style: none;
}

.feature-list li {
    position: relative;
    padding-left: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-accent-primary);
    font-weight: 600;
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    padding: var(--spacing-4xl) 0;
    background-color: var(--color-bg-secondary);
}

.cta-card {
    text-align: center;
    padding: var(--spacing-4xl);
    background-color: var(--color-bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-glow);
}

.cta-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
}

.cta-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 500px;
    margin: 0 auto var(--spacing-2xl);
}

.cta-buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

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

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: var(--spacing-4xl) 0 var(--spacing-2xl);
    background-color: var(--color-bg-primary);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-4xl);
    margin-bottom: var(--spacing-3xl);
}

.footer-brand {
    max-width: 300px;
}

.footer-brand .logo {
    margin-bottom: var(--spacing-lg);
}

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

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-2xl);
}

.footer-column h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-lg);
}

.footer-column a {
    display: block;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

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

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .phone-mockup {
        width: 280px;
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .feature-card.feature-main {
        grid-column: span 2;
        grid-row: span 1;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background-color: var(--color-bg-primary);
        flex-direction: column;
        padding: var(--spacing-xl);
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links a {
        padding: var(--spacing-md) 0;
    }
    
    .nav-links .btn {
        margin-left: 0;
        margin-top: var(--spacing-md);
        width: 100%;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-card.feature-main {
        grid-column: span 1;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr 1fr;
    }
    
    .cta-card {
        padding: var(--spacing-2xl);
    }
    
    .cta-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .stat-divider {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .cta-buttons .btn {
        width: 100%;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .phone-mockup {
        width: 260px;
    }
}

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

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

[data-animate] {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].visible {
    opacity: 1;
    transform: translateY(0);
}