:root {
    --primary: #5b8cff;
    --dark: #111827;
    --light: #f9fafb;
    --gray: #6b7280;
}

/* Reset & base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background: var(--light);
    color: var(--dark);
    line-height: 1.6;
}

/* Header */
header {
    padding: 2rem;
    text-align: center;
}

header h1 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
}

header p {
    color: var(--gray);
    font-size: 1.1rem;
    max-width: 600px;
    margin: auto;
}

/* Hero */
.hero {
    text-align: center;
    padding: 3rem 1rem;
}

.download-buttons {
    margin-top: 2rem;
}

.btn {
    display: inline-block;
    padding: 0.9rem 1.8rem;
    margin: 0.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: 0.3s ease;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    opacity: 0.9;
}

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

.btn-outline:hover {
    background: var(--primary);
    color: white;
}

/* Sections */
section {
    padding: 4rem 1rem;
    max-width: 1100px;
    margin: auto;
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

.feature h3 {
    margin-bottom: 1rem;
}

/* Screenshots */
.screenshots-section {
    padding: 4rem 1rem;
    max-width: 1100px;
    margin: auto;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.screenshot-item {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.screenshot-item img {
    width: 100%;
    display: block;
    border-radius: 12px;
    transition: transform 0.3s ease;
}

.screenshot-item:hover img {
    transform: scale(1.05);
}

.screenshot-item .caption {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0.5rem 1rem;
    background: rgba(0,0,0,0.5);
    color: white;
    font-size: 0.85rem;
    text-align: center;
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
    transition: background 0.3s ease;
}

.screenshot-item:hover .caption {
    background: rgba(0,0,0,0.7);
}

@media (max-width: 500px) {
    .screenshot-item .caption {
        font-size: 0.75rem;
        padding: 0.4rem 0.8rem;
    }
}

/* Crypto donation */
.crypto-section {
    background: #f0f4f8;
    padding: 3rem 1rem;
    border-radius: 12px;
    text-align: center;
}

.crypto-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    max-width: 700px;
    margin: auto;
}

.crypto-item {
    display: flex;
    align-items: center;
    background: white;
    padding: 0.7rem 1rem;
    border-radius: 8px;
    box-shadow: 0 3px 12px rgba(0,0,0,0.08);
    cursor: pointer;
    gap: 0.6rem;
    min-width: 220px;
    transition: 0.2s ease;
}

.crypto-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(0,0,0,0.12);
}

.crypto-icon {
    width: 28px;
    height: 28px;
}

.crypto-item code {
    font-size: 0.85rem;
    overflow-x: auto;
    white-space: nowrap;
}

@media (max-width: 500px) {
    .crypto-item {
        flex-direction: column;
        align-items: flex-start;
    }
}

footer {
    text-align: center;
    padding: 2rem;
    background: white;
    color: var(--gray);
    font-size: 0.9rem;
}

@media (max-width: 600px) {
    header h1 {
        font-size: 2rem;
    }
}