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

:root {
    /* iOS-inspired color palette */
    --primary-color: #007AFF;
    --primary-gradient: linear-gradient(135deg, #007AFF 0%, #5856D6 100%);
    --secondary-color: #5856D6;
    --accent-color: #FF6B9D;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --text-tertiary: #8E8E93;
    --background-primary: #FFFFFF;
    --background-secondary: #F5F5F7;
    --background-tertiary: #FBFBFD;
    --border-color: #E5E5EA;
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.08);
    --shadow-medium: 0 8px 30px rgba(0, 0, 0, 0.12);
    --shadow-heavy: 0 20px 60px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --border-radius-large: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-primary);
    overflow-x: hidden;
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    transition: var(--transition);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-icon {
    font-size: 28px;
    filter: drop-shadow(0 2px 4px rgba(0, 122, 255, 0.3));
}

.logo-text {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: var(--transition);
    border-radius: 1px;
}

.nav-link:hover::after {
    width: 100%;
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, var(--background-primary) 0%, var(--background-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 60%;
    height: 100%;
    background: radial-gradient(circle at 70% 30%, rgba(0, 122, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.5;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-medium);
}

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

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

.btn-secondary:hover {
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.btn-icon {
    font-size: 18px;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-tertiary);
    font-weight: 500;
}

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

.phone-mockup {
    width: 280px;
    height: 560px;
    background: linear-gradient(145deg, #f0f0f0, #ffffff);
    border-radius: 40px;
    padding: 8px;
    box-shadow: var(--shadow-heavy);
    position: relative;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--background-primary);
    border-radius: 32px;
    overflow: hidden;
    position: relative;
}

.app-interface {
    padding: 20px 16px;
    height: 100%;
}

.status-bar {
    height: 20px;
    background: linear-gradient(90deg, #333 0%, #333 30%, transparent 30%, transparent 70%, #333 70%);
    border-radius: 10px;
    margin-bottom: 20px;
    opacity: 0.3;
}

.app-header {
    margin-bottom: 32px;
}

.app-header h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

.task-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    margin-bottom: 12px;
    transition: var(--transition);
}

.task-item.completed {
    opacity: 0.6;
}

.task-item.completed .task-text {
    text-decoration: line-through;
}

.task-icon {
    font-size: 18px;
}

.task-text {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
}

.add-task {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    margin-top: 20px;
}

.add-icon {
    font-size: 20px;
    font-weight: bold;
}

.add-text {
    font-size: 16px;
    font-weight: 500;
}

/* Features Section */
.features {
    padding: 100px 0;
    background: var(--background-tertiary);
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.section-description {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--background-primary);
    padding: 40px 32px;
    border-radius: var(--border-radius-large);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    text-align: center;
}

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

.feature-icon {
    font-size: 48px;
    margin-bottom: 24px;
    display: block;
}

.feature-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.feature-description {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Download Section */
.download {
    padding: 100px 0;
    background: var(--background-primary);
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.download-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.download-description {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.5;
}

.download-features {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.download-feature {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 16px;
    color: var(--text-primary);
}

.check-icon {
    color: #30D158;
    font-weight: bold;
    font-size: 18px;
}

.download-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.app-store-button {
    background: var(--text-primary);
    color: white;
    border-radius: var(--border-radius);
    padding: 16px 32px;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: var(--shadow-medium);
}

.app-store-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-heavy);
}

.app-store-content {
    display: flex;
    align-items: center;
    gap: 16px;
}

.app-store-icon {
    font-size: 32px;
}

.app-store-line1 {
    font-size: 14px;
    opacity: 0.8;
}

.app-store-line2 {
    font-size: 20px;
    font-weight: 600;
}

.coming-soon {
    font-size: 14px;
    color: var(--text-tertiary);
    text-align: center;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 60px 0 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand .logo-text {
    color: white;
}

.footer-description {
    margin-top: 16px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 16px;
}

.footer-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 12px;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-size: 16px;
    transition: var(--transition);
}

.contact-link:hover {
    color: white;
    transform: translateX(4px);
}

.contact-icon {
    font-size: 18px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content,
    .download-content {
        grid-template-columns: 1fr;
        gap: 60px;
        text-align: center;
    }
    
    .hero-title {
        font-size: 48px;
    }
    
    .section-title,
    .download-title {
        font-size: 40px;
    }
    
    .phone-mockup {
        width: 240px;
        height: 480px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    
    .nav {
        flex-direction: column;
        gap: 16px;
        padding: 12px 0;
    }
    
    .nav-links {
        gap: 24px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-description {
        font-size: 18px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
        gap: 32px;
    }
    
    .section-title,
    .download-title {
        font-size: 32px;
    }
    
    .section-description,
    .download-description {
        font-size: 18px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .feature-card {
        padding: 32px 24px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .phone-mockup {
        width: 200px;
        height: 400px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }
    
    .section-title,
    .download-title {
        font-size: 28px;
    }
    
    .hero-stats {
        gap: 20px;
        flex-wrap: wrap;
    }
    
    .stat-number {
        font-size: 20px;
    }
    
    .phone-mockup {
        width: 180px;
        height: 360px;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

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

.feature-card,
.hero-text,
.hero-image {
    animation: fadeInUp 0.6s ease-out;
}