:root {
    --primary-color: #2d3748;
    --secondary-color: #4a5568;
    --accent-color: #3182ce;
    --background-color: #f7fafc;
    --baby-color: #f093fb;
    --currency-color: #10b981;
    --frugal-color: #10b981;
    --green-light: #4caf50;
    --blue-light: #2196f3;
    --orange-light: #ff9800;
    --red-light: #f44336;
    --purple-light: #9c27b0;
    --indigo-light: #3f51b5;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--primary-color);
    background-color: var(--background-color);
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

/* Headers */
h1 { font-size: 2rem; margin-bottom: 1rem; }
h2 { font-size: 1.75rem; margin-bottom: 1rem; }
h3 { font-size: 1.5rem; margin-bottom: 0.75rem; }
h4 { font-size: 1.125rem; margin-bottom: 0.5rem; }
p { font-size: 1rem; margin-bottom: 1rem; }

/* Common sections */
.header {
    text-align: center;
    margin-bottom: 3rem;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-color);
    text-decoration: none;
    margin-bottom: 2rem;
    font-size: 1rem;
}

.back-link:hover {
    text-decoration: underline;
}

.content-section,
.download-section,
.features-section,
.instructions,
.screenshots-section,
.version-selector {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.support-section {
    background: #fff3cd;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    border-left: 4px solid #ffc107;
    text-align: center;
}

.privacy-section {
    background: #d1ecf1;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    border-left: 4px solid #17a2b8;
}

.use-cases {
    background: #e6fffa;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    border-left: 4px solid #38b2ac;
}

.footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid #e2e8f0;
    color: var(--secondary-color);
}

.footer p {
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.footer a {
    font-size: 0.95rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: background-color 0.3s;
    margin: 1rem 0;
    font-size: 1.0rem;
}

.btn:hover {
    filter: brightness(0.9);
}

.btn-support {
    background-color: #28a745;
    margin-top: 1rem;
}

.btn-support:hover {
    background-color: #28a745;
}

/* Grids and cards */
.features-grid,
.instructions-grid,
.screenshots-container,
.currency-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.feature {
    padding: 1.25rem;
    background-color: #f8fafc;
    border-left: 4px solid;
}

.feature h4 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.feature p {
    font-size: 0.95rem;
    color: var(--secondary-color);
    margin-bottom: 0;
}

.feature-category {
    margin-bottom: 2rem;
}

.feature-category h3 {
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #f0f0f0;
}

.instruction-step {
    padding: 1.25rem;
    background: #f0f9ff;
    border-radius: 8px;
}

.instruction-step h4 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
}

.instruction-step p {
    font-size: 0.95rem;
    color: var(--secondary-color);
    margin-bottom: 0;
}

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

.screenshot-image {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    border: 1px solid #e2e8f0;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.screenshot-image:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}

/* Languages */
.languages-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: #e2e8f0;
    color: #4a5568;
    border-radius: 20px;
    font-size: 0.9rem;
    margin: 0.5rem 0 1rem 0;
    font-weight: 600;
}

.languages-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.language-tag {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    background: #f7fafc;
    border: 1px solid #cbd5e0;
    color: #4a5568;
    border-radius: 15px;
    font-size: 0.8rem;
}

/* INDEX PAGE */
.index .header {
    border-bottom: 1px solid #e2e8f0;
    padding-bottom: 2rem;
}

.index .apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.index .app-card {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.index .app-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.index .app-icon {
    width: 80px;
    height: 80px;
    border-radius: 15px;
    margin-bottom: 1rem;
    object-fit: cover;
}

.index .app-title {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.index .app-description {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    min-height: 60px;
}

.index .platform-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: #e2e8f0;
    border-radius: 15px;
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.index .download-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.index .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background-color: var(--accent-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: background-color 0.3s;
    flex: 1;
    min-width: 140px;
    justify-content: center;
}

.index .btn:hover {
    background-color: #2c5aa0;
}

.index .btn-android {
    background-color: #3ddc84;
}

.index .btn-android:hover {
    background-color: #2cb472;
}

.index .btn-windows {
    background-color: #0078d4;
}

.index .btn-windows:hover {
    background-color: #106ebe;
}

.index .btn-details {
    background-color: var(--secondary-color);
}

.index .btn-details:hover {
    background-color: #2d3748;
}

.index .nav-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.index .nav-links a {
    color: var(--accent-color);
    text-decoration: none;
}

.index .nav-links a:hover {
    text-decoration: underline;
}

/* APP HERO */
.app-hero {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 3rem;
    align-items: start;
}

.app-icon-large {
    width: 150px;
    height: 150px;
    border-radius: 20px;
    object-fit: cover;
    justify-self: center;
}

.app-info h1 {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.app-tagline {
    font-size: 1.2rem;
    color: var(--secondary-color);
    margin-bottom: 1.25rem;
}

.platform-badge-large {
    display: inline-block;
    padding: 0.5rem 1rem;
    color: white;
    border-radius: 20px;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

/* BabyBara */
.babybara .platform-badge-large,
.babybara .btn:not(.btn-support) {
    background-color: #3ddc84;
}

.babybara .btn:not(.btn-support):hover {
    background-color: #2cb472;
}

.babybara .feature {
    border-left-color: var(--baby-color);
}

.babybara .feature-category h3 {
    color: var(--baby-color);
}

/* Currency Converter */
.converter .platform-badge-large,
.converter .btn:not(.btn-support) {
    background-color: #3ddc84;
}

.converter .btn:not(.btn-support):hover {
    background-color: #2cb472;
}

.converter .feature {
    border-left-color: var(--currency-color);
}

.converter .feature-category h3 {
    color: var(--currency-color);
}

.converter .stat-number {
    color: var(--currency-color);
}

.version-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    color: white;
    border-radius: 15px;
    font-size: 0.8rem;
    margin-left: 0.5rem;
}

.converter .version-badge.huawei {
    background-color: #ef4444;
}

.converter .version-badge.android {
    background-color: #3ddc84;
}

.converter .version-badge.stable {
    background-color: #6b7280;
}

.currency-stats {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.stat-card {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.stat-number {
    font-size: 2rem;
    font-weight: bold;
}

.version-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 1rem;
}

.version-tab {
    padding: 0.75rem 1.5rem;
    background: #f8fafc;
    border: 2px solid #e2e8f0;
    border-radius: 8px 8px 0 0;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
}

.version-tab:hover {
    background: #e2e8f0;
}

.version-tab.active {
    background: #3182ce;
    color: white;
    border-color: #3182ce;
}

.version-content {
    display: none;
    padding: 1.5rem;
    background: #f8fafc;
    border-radius: 8px;
}

.version-content.active {
    display: block;
}

.download-archive {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px dashed #e2e8f0;
}

.archive-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.archive-table th,
.archive-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

.archive-table th {
    background: #f8fafc;
    font-weight: 600;
}

.language-note-box {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background: #e8f5e9;
    border-radius: 8px;
    border-left: 4px solid var(--green-light);
}

.language-note-box h4 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
}

.language-note-box p {
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.language-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 0.5rem;
}

.language-tag-colored {
    padding: 0.3rem 0.8rem;
    color: white;
    border-radius: 15px;
    font-size: 0.85rem;
}

.converter .lang-english { background-color: var(--green-light); }
.converter .lang-german { background-color: var(--blue-light); }
.converter .lang-french { background-color: var(--orange-light); }
.converter .lang-spanish { background-color: var(--red-light); }
.converter .lang-russian { background-color: var(--purple-light); }
.converter .lang-chinese { background-color: var(--indigo-light); }

/* CopyBara */
.copybara .platform-badge-large,
.copybara .btn:not(.btn-support) {
    background-color: #0078d4;
}

.copybara .btn:not(.btn-support):hover {
    background-color: #106ebe;
}

.copybara .feature {
    border-left-color: var(--accent-color);
}

.copybara .feature-category h3 {
    color: var(--accent-color);
}

/* Frugal */
.frugal .platform-badge-large,
.frugal .btn:not(.btn-support) {
    background-color: #3ddc84;
}

.frugal .btn:not(.btn-support):hover {
    background-color: #2cb472;
}

.frugal .feature {
    border-left-color: var(--frugal-color);
}

.frugal .feature-category h3 {
    color: var(--frugal-color);
}

.example-box {
    margin-top: 2rem;
    padding: 1.25rem;
    background: #f0f9ff;
    border-radius: 8px;
}

.example-box h4 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
}

.example-box ul {
    margin: 0.5rem 0 0.5rem 1.5rem;
    color: var(--secondary-color);
    font-size: 0.95rem;
}

.example-box p {
    font-size: 0.95rem;
    margin-bottom: 0;
}

.frugal .lang-english { background-color: var(--green-light); }
.frugal .lang-russian { background-color: var(--blue-light); }
.frugal .lang-spanish { background-color: var(--orange-light); }

/* Privacy Policy & Terms */
.privacy .header,
.terms .header {
    border-bottom: 1px solid #e2e8f0;
    padding-bottom: 2rem;
}

.privacy .content-section,
.terms .content-section {
    background: white;
    border-radius: 10px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.privacy h1,
.terms h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.privacy h2,
.terms h2 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    color: var(--primary-color);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #e2e8f0;
}

.privacy h3,
.terms h3 {
    font-size: 1.2rem;
    margin: 1.5rem 0 0.5rem;
    color: var(--secondary-color);
}

.privacy .highlight-box {
    background: #f0f9ff;
    border-left: 4px solid var(--accent-color);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 8px 8px 0;
}

.terms .warning-box {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 8px 8px 0;
}

.terms .info-box {
    background: #d1ecf1;
    border-left: 4px solid #17a2b8;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 8px 8px 0;
}

.app-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.app-item {
    padding: 1rem;
    background: #f8fafc;
    border-radius: 8px;
    text-align: center;
}

.update-date,
.effective-date {
    background: #e6fffa;
    padding: 1rem;
    border-radius: 8px;
    margin: 1.5rem 0;
    text-align: center;
}

.license-section {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1.5rem 0;
}

/* Media queries */
@media (max-width: 768px) {
    body {
        padding: 1rem;
    }

    .app-hero {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .features-grid,
    .instructions-grid,
    .screenshots-container,
    .currency-stats {
        grid-template-columns: 1fr;
    }

    .screenshot-image {
        max-width: 280px;
    }

    .version-tabs {
        flex-direction: column;
    }

    .archive-table {
        display: block;
        overflow-x: auto;
    }

    .languages-list {
        justify-content: center;
    }

    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    
    .app-info h1 { font-size: 2rem; }
    .app-tagline { font-size: 1.1rem; }
    
    .index .apps-grid { grid-template-columns: 1fr; }
    .index .download-links { flex-direction: column; }
    .index .btn { min-width: auto; }
    
    .privacy .content-section,
    .terms .content-section { padding: 1.5rem; }
    
    .privacy h1,
    .terms h1 { font-size: 2rem; }
    
    .app-list { grid-template-columns: 1fr; }
}