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

:root {
    --primary-color: #6366F1;
    --primary-dark: #4F46E5;
    --primary-light: #818CF8;
    --secondary-color: #EC4899;
    --accent-color: #F59E0B;
    --text-dark: #1F2937;
    --text-light: #6B7280;
    --text-white: #FFFFFF;
    --background: #FFFFFF;
    --background-light: #F9FAFB;
    --background-dark: #111827;
    --gradient-sunrise: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-feature: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

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

.nav-brand h2 {
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.5rem;
    font-weight: 800;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.nav-links .cta-button {
    background: var(--gradient-hero);
    color: var(--text-white);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.nav-links .cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    color: var(--text-white);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.1)" d="M0,96L48,112C96,128,192,160,288,165.3C384,171,480,149,576,128C672,107,768,85,864,90.7C960,96,1056,128,1152,133.3C1248,139,1344,117,1392,106.7L1440,96L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom;
    background-size: cover;
    opacity: 0.5;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    animation: fadeInUp 1s ease 0.4s both;
}

.primary-button,
.secondary-button {
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
}

.primary-button {
    background: var(--text-white);
    color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.primary-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.secondary-button {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-white);
    border: 2px solid var(--text-white);
}

.secondary-button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn 1.5s ease 0.5s both;
}

.phone-mockup {
    width: 300px;
    height: 600px;
    background: var(--background-dark);
    border-radius: 40px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
    border: 8px solid #1F2937;
}

.sunrise-gradient {
    width: 100%;
    height: 100%;
    background: linear-gradient(to top,
        #1a1a2e 0%,
        #16213e 20%,
        #0f4c75 40%,
        #3282b8 60%,
        #f4a261 80%,
        #e76f51 100%
    );
    animation: sunriseAnimation 8s ease-in-out infinite;
}

@keyframes sunriseAnimation {
    0%, 100% {
        opacity: 0.7;
    }
    50% {
        opacity: 1;
    }
}

/* Features Overview */
.features-overview {
    padding: 80px 0;
    background: var(--background-light);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 1rem;
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: var(--background);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

.feature-card:nth-child(2) .feature-icon {
    animation-delay: 0.5s;
}

.feature-card:nth-child(3) .feature-icon {
    animation-delay: 1s;
}

.feature-card:nth-child(4) .feature-icon {
    animation-delay: 1.5s;
}

.feature-card:nth-child(5) .feature-icon {
    animation-delay: 2s;
}

.feature-card:nth-child(6) .feature-icon {
    animation-delay: 2.5s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* Detailed Features */
.detailed-features {
    padding: 80px 0;
}

.feature-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-bottom: 6rem;
}

.feature-detail.reverse {
    direction: rtl;
}

.feature-detail.reverse > * {
    direction: ltr;
}

.feature-detail-content h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-detail-content p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
}

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

.feature-list li {
    padding: 0.75rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-light);
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.25rem;
}

.feature-detail-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.visual-placeholder {
    width: 100%;
    height: 400px;
    border-radius: 20px;
    box-shadow: var(--shadow-xl);
}

.music-visual {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}

.music-visual::after {
    content: '♫';
    position: absolute;
    font-size: 10rem;
    color: rgba(255, 255, 255, 0.2);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.light-visual {
    background: linear-gradient(to top,
        #1a1a2e 0%,
        #16213e 20%,
        #0f4c75 40%,
        #3282b8 60%,
        #f4a261 80%,
        #e76f51 100%
    );
}

.weather-visual {
    background: linear-gradient(135deg, #3b82f6 0%, #93c5fd 100%);
    position: relative;
}

.weather-visual::after {
    content: '🌤️';
    position: absolute;
    font-size: 8rem;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.health-visual {
    background: linear-gradient(135deg, #ec4899 0%, #f472b6 100%);
    position: relative;
}

.health-visual::after {
    content: '❤️';
    position: absolute;
    font-size: 8rem;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: heartbeat 2s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        transform: translate(-50%, -50%) scale(1.1);
    }
}

.backup-visual {
    background: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    position: relative;
}

.backup-visual::after {
    content: '👥';
    position: absolute;
    font-size: 8rem;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* How It Works */
.how-it-works {
    padding: 80px 0;
    background: var(--background-light);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-top: 3rem;
}

.step {
    text-align: center;
    padding: 2rem;
}

.step-number {
    width: 80px;
    height: 80px;
    background: var(--gradient-hero);
    color: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
    box-shadow: var(--shadow-lg);
}

.step h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.step p {
    color: var(--text-light);
}

/* Technology Stack */
.tech-stack {
    padding: 80px 0;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.tech-item {
    background: var(--background);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.tech-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
}

.tech-item h4 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.tech-item p {
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Download CTA */
.download-cta {
    padding: 100px 0;
    background: var(--gradient-hero);
    color: var(--text-white);
    text-align: center;
}

.download-cta h2 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.download-cta p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.app-store-button {
    display: inline-block;
    background: var(--text-white);
    color: var(--primary-color);
    padding: 1.25rem 3rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.125rem;
    box-shadow: var(--shadow-xl);
    transition: all 0.3s ease;
    margin-bottom: 1rem;
}

.app-store-button:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
}

.requirements {
    font-size: 0.875rem;
    opacity: 0.8;
    margin-top: 1rem;
}

/* Footer */
.footer {
    background: var(--background-dark);
    color: var(--text-white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-white);
}

.footer-section p,
.footer-section li {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 0.5rem;
}

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

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--text-white);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 968px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-visual {
        order: -1;
        margin-bottom: 2rem;
    }

    .phone-mockup {
        width: 250px;
        height: 500px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-cta {
        justify-content: center;
        flex-wrap: wrap;
    }

    .feature-detail,
    .feature-detail.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
    }

    .nav-links {
        gap: 1rem;
    }

    .nav-links a {
        font-size: 0.875rem;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .download-cta h2 {
        font-size: 2rem;
    }

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

    .nav-links a:not(.cta-button) {
        display: none;
    }

    .primary-button,
    .secondary-button {
        padding: 0.875rem 1.5rem;
        font-size: 0.875rem;
    }

    .phone-mockup {
        width: 200px;
        height: 400px;
    }

    .visual-placeholder {
        height: 300px;
    }
}

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

/* Selection Color */
::selection {
    background: var(--primary-color);
    color: var(--text-white);
}