/* --- Base Styles & Variables --- */
:root {
    --color-bg-dark: #111827; /* gray-900 */
    --color-bg-medium: #1F2937; /* gray-800 */
    --color-bg-light: #374151; /* gray-700 */
    --color-text-light: #F9FAFB; /* gray-50 */
    --color-text-medium: #D1D5DB; /* gray-300 */
    --color-text-dark: #9CA3AF; /* gray-400 */
    --color-text-darker: #6B7280; /* gray-500 */
    --color-primary: #EC4899; /* pink-500 */
    --color-primary-hover: #DB2777; /* pink-600 */
    --color-primary-light: #FBCFE8; /* pink-200 */
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-bg-dark);
    color: var(--color-text-light);
    font-family: 'Inter', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

.text-center {
    text-align: center;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 3rem;
}

/* --- Header & Navigation --- */
#header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    transition: all 0.3s ease-in-out;
}
#header.scrolled {
    background-color: rgba(31, 41, 55, 0.9);
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    backdrop-filter: blur(8px);
}
#header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    padding-bottom: 1rem;
}
.logo {
    font-size: 1.875rem;
    font-weight: 900;
    letter-spacing: -0.05em;
    color: white;
    text-decoration: none;
}
.desktop-nav {
    display: none;
    align-items: center;
    gap: 2rem;
}
.desktop-nav a {
    color: var(--color-text-medium);
    text-decoration: none;
    transition: color 0.2s;
}
.desktop-nav a:hover {
    color: var(--color-primary);
}
.cta-button-small {
    background-color: var(--color-primary);
    color: white;
    font-weight: bold;
    border-radius: 9999px;
    padding: 0.5rem 1.5rem;
    transition: all 0.2s;
    transform: scale(1);
}
.cta-button-small:hover {
    background-color: var(--color-primary-hover);
    transform: scale(1.05);
}

.mobile-nav-button {
    display: block;
}
.mobile-nav-button button {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
}
.mobile-menu-container {
    display: none;
    flex-direction: column;
    align-items: center;
    background-color: rgba(31, 41, 55, 0.9);
    padding: 1rem 0;
}
.mobile-menu-container.open {
    display: flex;
}
.mobile-link {
    display: block;
    padding: 0.5rem 1rem;
    font-size: 1.125rem;
    color: var(--color-text-medium);
    text-decoration: none;
}

/* --- Hero Section --- */
.hero-section {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    padding: 1rem;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(0,0,0,0.5);
    z-index: 10;
}
.hero-content {
    position: relative;
    z-index: 20;
}
.hero-content h1 {
    font-size: 3rem;
    line-height: 1.1;
    font-weight: 900;
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
}
.hero-content p {
    font-size: 1.125rem;
    color: var(--color-text-medium);
    max-width: 48rem;
    margin: 0 auto 2rem auto;
}
.cta-button-large {
    display: inline-block;
    background-color: var(--color-primary);
    color: white;
    font-weight: bold;
    border-radius: 9999px;
    font-size: 1.25rem;
    padding: 1rem 3rem;
    text-decoration: none;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    transform: scale(1);
}
.cta-button-large:hover {
    background-color: var(--color-primary-hover);
    transform: scale(1.05);
    box-shadow: 0 0 20px var(--color-primary-light);
}

/* --- Heart Background Animation --- */
.heart-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    background: var(--color-bg-dark);
    overflow: hidden;
}
.heart-bg::before {
    content: '❤️';
    position: absolute;
    font-size: 4rem;
    color: var(--color-primary);
    opacity: 0;
    animation: hearts 10s linear infinite;
    top: 50%;
    left: 50%;
}
.heart-bg::after {
    content: '💖';
    position: absolute;
    font-size: 2rem;
    color: var(--color-primary-light);
    opacity: 0;
    animation: hearts 15s linear infinite reverse;
    top: 50%;
    left: 50%;
}
@keyframes hearts {
    0% { transform: translate(-50%, -50%) scale(0); opacity: 0; }
    10% { opacity: 0.1; }
    90% { opacity: 0.1; }
    100% { transform: translate(-50%, -50%) scale(25); opacity: 0; }
}

/* --- Features Section --- */
.features-section {
    padding: 5rem 0;
    background-color: var(--color-bg-dark);
}
.features-grid {
    display: grid;
    gap: 3rem;
}
.feature-card {
    background-color: var(--color-bg-medium);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
}
.feature-icon {
    color: var(--color-primary);
    margin-bottom: 1rem;
}
.feature-card h3 {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 0.75rem;
}
.feature-card p {
    color: var(--color-text-dark);
}

/* --- Testimonials Section --- */
.testimonials-section {
    padding: 5rem 0;
    background-color: var(--color-bg-medium);
}
.testimonials-grid {
    display: grid;
    gap: 2rem;
}
.testimonial-card {
    background-color: var(--color-bg-dark);
    padding: 1.5rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
}
.testimonial-text {
    color: var(--color-text-medium);
    flex-grow: 1;
    margin-bottom: 1rem;
}
.testimonial-author {
    display: flex;
    align-items: center;
    margin-top: auto;
}
.author-image {
    width: 3rem;
    height: 3rem;
    border-radius: 9999px;
    margin-right: 1rem;
    object-fit: cover;
}
.author-name {
    font-weight: bold;
}
.author-title {
    color: var(--color-primary);
    font-size: 0.875rem;
}

/* --- Pricing Section --- */
.pricing-section {
    padding: 6rem 0;
    background-color: var(--color-bg-dark);
}
.pricing-card {
    max-width: 48rem;
    margin: 0 auto;
    background-color: var(--color-bg-medium);
    border-radius: 1.5rem;
    padding: 2rem;
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
}
.pricing-card h2 {
    font-size: 2.25rem;
    font-weight: 900;
    margin-bottom: 1rem;
}
.pricing-subtitle {
    color: var(--color-text-dark);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}
.price-display {
    margin: 1.5rem 0;
}
.price-amount {
    font-size: 4rem;
    font-weight: 900;
    color: var(--color-primary);
}
.price-term {
    color: var(--color-text-darker);
    margin-left: 0.5rem;
}
.buy-button {
    margin-top: 2rem;
}
.secure-checkout-text {
    color: var(--color-text-darker);
    font-size: 0.875rem;
    margin-top: 2rem;
}

/* --- Footer --- */
footer {
    background-color: var(--color-bg-medium);
    padding: 2rem 0;
    color: var(--color-text-darker);
}
.footer-links {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
}
.footer-links a {
    color: var(--color-text-darker);
    text-decoration: none;
    transition: color 0.2s;
}
.footer-links a:hover {
    color: var(--color-text-medium);
}

/* --- Animations --- */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    transition-delay: var(--delay, 0s);
}
.reveal.fade-in {
    transform: translateY(0);
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive Design (Media Queries) --- */
@media (min-width: 768px) {
    .desktop-nav { display: flex; }
    .mobile-nav-button { display: none; }
    .hero-content h1 { font-size: 4.5rem; }
    .hero-content p { font-size: 1.5rem; }
    .features-grid { grid-template-columns: repeat(3, 1fr); }
    .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
    .pricing-card { padding: 3rem; }
    .pricing-card h2 { font-size: 3rem; }
}
@media (min-width: 1024px) {
    .testimonials-grid { grid-template-columns: repeat(3, 1fr); }
}