:root {
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.2);
    --gold: #fbbf24;
    --font-sans: 'Inter', sans-serif;
    
    --card-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(56, 189, 248, 0.05), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(99, 102, 241, 0.05), transparent 25%);
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--accent-color);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.stats {
    display: flex;
    gap: 1rem;
}

.stat-badge {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 99px;
    font-size: 0.875rem;
    font-weight: 500;
    backdrop-filter: blur(10px);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    background: rgba(15, 23, 42, 0.5);
    padding: 0.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow-x: auto;
    scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
    background: var(--bg-card);
    color: var(--accent-color);
    box-shadow: 0 4px 12px var(--accent-glow);
    border: 1px solid rgba(56, 189, 248, 0.2);
}

/* Sections */
.tab-pane {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

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

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

.section-header {
    margin-bottom: 2rem;
}

.section-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.section-header p {
    color: var(--text-secondary);
}

.subsection-title {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin: 2rem 0 1rem 0;
    padding-bottom: 0.5rem;
    border-bottom: 1px dashed var(--border-color);
}

/* Grid & Cards */
.prices-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.price-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius);
    padding: 1.5rem;
    backdrop-filter: blur(12px);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.price-card:hover {
    transform: translateY(-5px);
    border-color: rgba(56, 189, 248, 0.4);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 0 20px var(--accent-glow);
}

.card-rank {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--border-color);
    color: var(--text-secondary);
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-bottom-left-radius: 12px;
    font-size: 0.85rem;
}

.card-top3 .card-rank.rank-1 { background: var(--gold); color: #000; box-shadow: 0 0 15px rgba(251, 191, 36, 0.4);}
.card-top3 .card-rank.rank-2 { background: #cbd5e1; color: #000; }
.card-top3 .card-rank.rank-3 { background: #b45309; color: #fff; }

.card-country {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
}

.country-code {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.continent {
    font-size: 0.85rem;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.plan-name {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.pricing {
    margin-top: auto;
}

.price-eur {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: baseline;
    gap: 0.25rem;
}

.price-eur span {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.price-details {
    display: flex;
    justify-content: space-between;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid rgba(255,255,255,0.05);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    background: var(--bg-card);
    border-radius: var(--card-radius);
    border: 1px dashed var(--border-color);
    color: var(--text-secondary);
}

/* Skeletons */
.skeleton {
    background: linear-gradient(-90deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.1) 50%, rgba(255,255,255,0.05) 100%);
    background-size: 400% 400%;
    animation: shimmer 1.2s ease-in-out infinite;
    border-radius: 4px;
}

@keyframes shimmer {
    0% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.skeleton-title { height: 28px; width: 60%; margin-bottom: 1rem; }
.skeleton-text { height: 16px; width: 40%; margin-bottom: 2rem; }
.skeleton-price { height: 36px; width: 50%; border-radius: 8px;}

/* Responsive */
@media (max-width: 768px) {
    .app-container { padding: 1rem; }
    .header { flex-direction: column; align-items: flex-start; gap: 1rem; }
}