:root {
    --bg-color: #f8fafc;
    /* Slate-50 */
    --text-color: #0f172a;
    /* Slate-900 */
    --text-muted: #64748b;
    /* Slate-500 */
    --primary-color: #7c3aed;
    /* Violet-600 */
    --primary-hover: #6d28d9;
    /* Violet-700 */
    --border-color: #e2e8f0;
    /* Slate-200 */
    --surface-color: #ffffff;
}

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

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    /* Very subtle organic mesh gradient for a modern feel, but light */
    background-image:
        radial-gradient(at 0% 0%, rgba(124, 58, 237, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(244, 63, 94, 0.15) 0px, transparent 50%);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
}

.container {
    width: 90%;
    max-width: 1000px;
    /* Slightly tighter container for better readability */
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
header {
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.8);
    /* Glass effect light */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    /* Brand color for logo in light mode */
    letter-spacing: -0.02em;
}

.btn-download {
    background-color: var(--primary-color);
    color: white;
    padding: 0.6rem 1.25rem;
    border-radius: 8px;
    /* Standard grounded radius */
    font-size: 0.9rem;
    font-weight: 600;
    transition: background-color 0.2s, transform 0.2s;
    box-shadow: 0 4px 6px -1px rgba(124, 58, 237, 0.3);
}

.btn-download:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 10px 15px -3px rgba(124, 58, 237, 0.4);
}

/* Hero Section */
.hero {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 5rem 0;
    gap: 4rem;
}

@media (min-width: 800px) {
    .hero {
        flex-direction: row;
        text-align: left;
        align-items: center;
        /* Align vertically center */
        justify-content: space-between;
    }
}

.hero-text {
    flex: 1;
    max-width: 500px;
}

.hero h1 {
    font-size: 3rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text-color);
    /* Solid dark color for readability */
}

@media (min-width: 768px) {
    .hero h1 {
        font-size: 3.75rem;
    }
}

.hero h1 span {
    color: var(--primary-color);
    /* Accent word if we had one, or keeping logic simple */
}

.hero p {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    line-height: 1.7;
    font-weight: 400;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-image img {
    max-width: 100%;
    width: 320px;
    /* Constrain width for elegance */
    height: auto;
    border-radius: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    /* Softer shadow */
    border: 1px solid white;
}

/* Clean Google Play Button */
.btn-google {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: #000;
    /* Keep black for recognition */
    color: #fff;
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 0.8rem 1.5rem;
    font-family: inherit;
    transition: all 0.2s ease;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.btn-google:hover {
    background-color: #1a1a1a;
    transform: translateY(-1px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.15);
}

.btn-google-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    line-height: 1.2;
}

.btn-google-text small {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.8);
}

.btn-google-text span {
    font-size: 1rem;
    font-weight: 500;
}


/* Footer */
footer {
    padding: 3rem 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
}