:root {
    --primary-color: #e91e63;
    --primary-light: #fce4ec;
    --primary-dark: #c2185b;
    --text-color: #333;
    --bg-color: #fdf2f5;
    --sidebar-width: 250px;
    --card-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    overflow: hidden;
}

/* Layout */
.main-layout {
    display: flex;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: #fff;
    display: flex;
    flex-direction: column;
    border-right: 1px solid rgba(0,0,0,0.05);
    box-shadow: 2px 0 5px rgba(0,0,0,0.02);
    z-index: 10;
}

.logo {
    padding: 30px 20px;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.logo h1 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
}

.logo p {
    margin: 5px 0 0;
    opacity: 0.9;
    font-size: 0.9rem;
    font-weight: 300;
}

.tabs {
    flex: 1;
    padding: 20px 0;
}

.tab-link {
    display: block;
    width: 100%;
    padding: 15px 25px;
    border: none;
    background: none;
    text-align: left;
    cursor: pointer;
    font-size: 1rem;
    color: #666;
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

.tab-link:hover {
    background-color: var(--primary-light);
    color: var(--primary-dark);
}

.tab-link.active {
    background-color: var(--primary-light);
    color: var(--primary-dark);
    border-left-color: var(--primary-color);
    font-weight: 600;
}

.sidebar-footer {
    padding: 20px;
    font-size: 0.8rem;
    color: #999;
    text-align: center;
    border-top: 1px solid #eee;
}

/* Content Area */
.content {
    flex: 1;
    padding: 40px;
    overflow-y: auto;
}

.tab-content {
    display: none;
    animation: fadeEffect 0.5s;
    max-width: 900px;
    margin: 0 auto;
}

@keyframes fadeEffect {
    from {opacity: 0; transform: translateY(10px);}
    to {opacity: 1; transform: translateY(0);}
}

/* Typography & Elements */
h2 {
    color: var(--primary-dark);
    margin-top: 0;
    font-size: 2rem;
    margin-bottom: 10px;
}

h3 {
    color: #444;
    margin-top: 0;
    border-bottom: 2px solid var(--primary-light);
    padding-bottom: 8px;
    margin-bottom: 15px;
}

.hero {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px;
    background: white;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    border-top: 4px solid var(--primary-color);
}

.hero h2 {
    margin-bottom: 10px;
}

.hero p {
    font-size: 1.1rem;
    color: #666;
}

.card {
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    margin-bottom: 25px;
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.feature-list li {
    margin-bottom: 10px;
    padding-left: 20px;
    position: relative;
}

.feature-list li:before {
    content: "•";
    color: var(--primary-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

.status-dot {
    height: 10px;
    width: 10px;
    border-radius: 50%;
    display: inline-block;
    margin: 0 5px;
}

.red { background-color: #e74c3c; }
.green { background-color: #2ecc71; }

/* Gallery */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.gallery-item {
    background: #fff;
    padding: 10px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    transition: transform 0.2s;
}

.gallery-item:hover {
    transform: translateY(-5px);
}

.gallery-item img {
    width: 100%;
    height: auto;
    border-radius: 4px;
    display: block;
}

/* Timeline (Changelog) */
.timeline {
    position: relative;
    padding-left: 30px;
    border-left: 2px solid var(--primary-light);
}

.timeline-item {
    margin-bottom: 30px;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -36px;
    top: 5px;
    width: 14px;
    height: 14px;
    background: white;
    border: 3px solid var(--primary-color);
    border-radius: 50%;
}

.timeline-item .date {
    font-size: 0.85rem;
    color: #888;
    margin-bottom: 5px;
}

.timeline-item .version {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-dark);
    margin-bottom: 10px;
}

.timeline-item .desc {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

.timeline-item ul {
    margin: 0;
    padding-left: 20px;
}

/* Download Section */
.download-card {
    background: white;
    padding: 40px;
    text-align: center;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--primary-light);
}

.file-details {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 6px;
    margin: 20px 0;
    text-align: left;
    font-family: monospace;
    font-size: 0.9rem;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 15px 40px;
    font-size: 1.1rem;
    border-radius: 30px;
    cursor: pointer;
    transition: background 0.3s, transform 0.2s;
    box-shadow: 0 4px 15px rgba(233, 30, 99, 0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.sub-text {
    margin-top: 15px;
    font-size: 0.9rem;
    color: #888;
}

.mt-4 {
    margin-top: 25px;
}