:root {
    /* Light Mode (Default) */
    --bg-color: #ffffff;
    --text-color: #111111;
    --accent-color: #000000;
    --gray-light: #333333;
    --gray-medium: #666666;
    --gray-dark: #f0f0f0;
    --header-bg: rgba(255, 255, 255, 0.9);
    --header-bg-scroll: rgba(255, 255, 255, 0.95);
    --section-bg: #f8f8f8;
    --card-bg: #ffffff;
    --card-border: #e0e0e0;
    --card-border-hover: #000000;
    --footer-border: #e0e0e0;
    --cta-gradient: linear-gradient(180deg, #ffffff 0%, #f0f0f0 100%);

    --font-main: 'Inter', sans-serif;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --bg-color: #000000;
    --text-color: #ffffff;
    --accent-color: #ffffff;
    --gray-light: #f3f3f3;
    --gray-medium: #888888;
    --gray-dark: #333333;
    --header-bg: rgba(0, 0, 0, 0.9);
    --header-bg-scroll: rgba(0, 0, 0, 0.95);
    --section-bg: #0a0a0a;
    --card-bg: #111;
    --card-border: #222;
    --card-border-hover: #333;
    --footer-border: #222;
    --cta-gradient: linear-gradient(180deg, #000000 0%, #111111 100%);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--header-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-color);
    text-decoration: none;
    letter-spacing: -1px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    font-size: 20px;
    padding: 8px;
    border-radius: 50%;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background-color: var(--gray-dark);
    /* Using gray-dark as background on hover */
    transform: rotate(15deg);
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
}

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

.btn-primary {
    background-color: var(--accent-color);
    color: var(--bg-color);
    padding: 10px 24px;
    border-radius: 30px;
    font-weight: 600;
}

.btn-primary:hover {
    background-color: var(--gray-light);
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    padding-top: 140px;
    padding-bottom: 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 64px;
    line-height: 1.1;
    font-weight: 700;
    margin-bottom: 24px;
    letter-spacing: -2px;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--gray-medium);
    margin-bottom: 40px;
    max-width: 480px;
}

.app-buttons {
    display: flex;
    gap: 16px;
}

.store-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    background-color: var(--gray-dark);
    color: var(--text-color);
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.store-btn:hover {
    background-color: var(--gray-medium);
    transform: translateY(-2px);
}

.store-btn.white {
    background-color: var(--text-color);
    color: var(--bg-color);
}

.store-btn.white:hover {
    background-color: var(--gray-light);
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
}

.phone-mockup {
    width: 100%;
    max-width: 420px;
    height: auto;
    /* filter: drop-shadow(0 20px 40px rgba(255, 255, 255, 0.1)); Removed to prevent box outline with solid black image */
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-20px);
    }

    100% {
        transform: translateY(0px);
    }
}

/* Features Section */
.features {
    padding: 120px 0;
    background-color: var(--section-bg);
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 80px;
    text-align: center;
    letter-spacing: -1px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.feature-card {
    padding: 40px;
    background-color: var(--card-bg);
    border-radius: 16px;
    transition: var(--transition);
    border: 1px solid var(--card-border);
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: var(--card-border-hover);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 24px;
    margin-bottom: 16px;
}

.feature-card p {
    color: var(--gray-medium);
}

/* CTA Section */
.cta-section {
    padding: 120px 0;
    text-align: center;
    background: var(--cta-gradient);
}

.cta-title {
    font-size: 48px;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.cta-text {
    font-size: 20px;
    color: var(--gray-medium);
    margin-bottom: 48px;
}

.app-buttons.center {
    justify-content: center;
}

/* Footer */
.footer {
    padding: 60px 0;
    border-top: 1px solid var(--footer-border);
}

.footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 32px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
}

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

.footer-links a {
    color: var(--gray-medium);
    text-decoration: none;
    transition: var(--transition);
}

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

.copyright {
    color: #444;
    font-size: 14px;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

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

    .hero-subtitle {
        margin: 0 auto 40px;
    }

    .app-buttons {
        justify-content: center;
    }

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

    .hero-title {
        font-size: 48px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 36px;
    }

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

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

    .store-btn {
        justify-content: center;
    }

    /* Mobile Header Fixes */
    .nav {
        gap: 12px;
    }

    .nav-link:not(.btn-primary) {
        display: none;
    }

    .logo {
        font-size: 20px;
    }

    .btn-primary {
        padding: 8px 16px;
        font-size: 14px;
    }
}

@media (max-width: 768px) {
    .nav-link:not(.btn-primary) {
        display: none;
    }

    .logo {
        font-size: 22px;
    }
}