:root {
    --bg-color: #f1f5f9;
    --card-bg: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --accent-kind1: #3b82f6; /* Blau */
    --accent-kind2: #ec4899; /* Rosa/Pink */
    --radius: 16px;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    padding-bottom: 20px;
}

/* Header */
.app-header {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    color: #ffffff;
    padding: 16px 20px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.header-content h1 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.header-content .icon {
    font-size: 1.2rem;
}

/* Main Layout */
.main-container {
    max-width: 768px;
    margin: 0 auto;
    padding: 16px;
}

/* Tab Navigation */
.tab-nav {
    display: flex;
    gap: 8px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(8px);
    padding: 6px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    position: sticky;
    top: 12px;
    z-index: 50;
}

.tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 12px;
    border: none;
    background: transparent;
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}

.tab-btn.active {
    background: #ffffff;
    color: var(--text-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.tab-btn.kind1-btn.active {
    color: var(--accent-kind1);
}

.tab-btn.kind2-btn.active {
    color: var(--accent-kind2);
}

/* Cards & Content */
.tab-content {
    display: none;
    animation: fadeIn 0.25s ease-in-out;
}

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

.tab-content + .tab-content.active {
    margin-top: 16px;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    border: 1px solid rgba(226, 232, 240, 0.8);
}

.card-header {
    padding: 12px 16px;
    border-bottom: 1px solid #f1f5f9;
}

.kind1-card .card-header {
    border-top: 4px solid var(--accent-kind1);
}

.kind2-card .card-header {
    border-top: 4px solid var(--accent-kind2);
}

.card-header h2 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Image Container */
.img-container {
    padding: 12px;
    background-color: #fafafa;
    overflow-x: auto;
    display: flex;
    justify-content: center;
}

.img-container img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

/* Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}