/* Reset and base styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-primary: #4a7c59;
    --color-primary-dark: #3d6549;
    --color-windows: #0078d4;
    --color-windows-dark: #006cc1;
    --color-macos: #555555;
    --color-macos-dark: #444444;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-background: #f8faf8;
    --color-white: #ffffff;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background: linear-gradient(135deg, #e8f5e9 0%, #f3e5f5 50%, #e3f2fd 100%);
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
    position: relative;
}

/* Language switcher */
.language-switcher {
    position: absolute;
    top: 16px;
    right: 20px;
    display: flex;
    gap: 4px;
    background: var(--color-white);
    border-radius: var(--radius-sm);
    padding: 4px;
    box-shadow: var(--shadow-sm);
}

.lang-btn {
    border: none;
    background: transparent;
    padding: 6px 12px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-light);
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.lang-btn:hover {
    background: var(--color-background);
    color: var(--color-text);
}

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

/* Header */
header {
    text-align: center;
    margin-bottom: 48px;
}

.app-icon {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: 24px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.tagline {
    font-size: 1.25rem;
    color: var(--color-text-light);
    font-weight: 400;
}

/* Main content */
main {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 40px;
}

section {
    margin-bottom: 40px;
}

section:last-child {
    margin-bottom: 0;
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 16px;
    text-align: center;
}

/* Description */
.description p {
    text-align: center;
    font-size: 1.1rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* Downloads section */
.downloads {
    background: var(--color-background);
    border-radius: var(--radius-md);
    padding: 32px;
    margin-left: -20px;
    margin-right: -20px;
}

.version-info {
    text-align: center;
    margin-bottom: 24px;
    font-size: 0.95rem;
    color: var(--color-text-light);
}

.version-info .loading {
    color: var(--color-text-light);
    font-style: italic;
}

.version-info .version {
    font-weight: 600;
    color: var(--color-primary);
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 400px;
    margin: 0 auto 24px;
}

@media (min-width: 600px) {
    .download-buttons {
        flex-direction: row;
        max-width: 100%;
        justify-content: center;
    }
}

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 28px;
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-white);
    font-weight: 500;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
    min-width: 200px;
}

.download-btn:hover:not(.disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.download-btn:active:not(.disabled) {
    transform: translateY(0);
}

.download-btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.download-btn.windows {
    background: var(--color-windows);
}

.download-btn.windows:hover:not(.disabled) {
    background: var(--color-windows-dark);
}

.download-btn.macos {
    background: var(--color-macos);
}

.download-btn.macos:hover:not(.disabled) {
    background: var(--color-macos-dark);
}

.platform-icon {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
}

.btn-text {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.btn-label {
    font-size: 0.8rem;
    opacity: 0.9;
    font-weight: 400;
}

.btn-platform {
    font-size: 1.1rem;
    font-weight: 600;
}

.download-note {
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.8;
}

/* Screenshot */
.screenshot {
    text-align: center;
}

.app-screenshot {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

/* Features */
.features ul {
    list-style: none;
    max-width: 500px;
    margin: 0 auto;
}

.features li {
    padding: 12px 0;
    padding-left: 32px;
    position: relative;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.features li:last-child {
    border-bottom: none;
}

.features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
    font-size: 1.1rem;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 48px;
    padding-top: 24px;
    color: var(--color-text-light);
}

footer a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

footer a:hover {
    text-decoration: underline;
}

.copyright {
    font-size: 0.85rem;
    margin-top: 8px;
    opacity: 0.8;
}

/* Error state */
.error-message {
    background: #fff3cd;
    border: 1px solid #ffc107;
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
    margin-bottom: 16px;
}

.error-message a {
    color: var(--color-primary);
    font-weight: 500;
}

/* Responsive adjustments */
@media (max-width: 480px) {
    .container {
        padding: 24px 16px;
        padding-top: 60px;
    }
    
    .language-switcher {
        top: 12px;
        right: 12px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    main {
        padding: 24px;
    }
    
    .downloads {
        padding: 24px 16px;
        margin-left: -12px;
        margin-right: -12px;
    }
    
    .app-icon {
        width: 80px;
        height: 80px;
    }
}