:root {
    /* Kalıcı Renkler - Tema bağımsız (Türk Telekom Esintisi ve Modern Renkler) */
    --clr-primary: #38bdf8; /* Turkuaz/Sky Blue */
    --clr-secondary: #facc15; /* Sarı */
    --clr-navy: #1e3a8a; /* Lacivert */
    --clr-success: #22c55e;
    
    /* Default Dark Mode */
    --bg-base: #020617;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    
    --glass-bg: rgba(30, 41, 59, 0.4);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    
    --input-bg: rgba(15, 23, 42, 0.6);
    --input-border: rgba(56, 189, 248, 0.3);
    --input-focus: rgba(56, 189, 248, 0.8);
    
    --mesh-1: radial-gradient(circle at 20% 20%, rgba(56, 189, 248, 0.12), transparent 45%);
    --mesh-2: radial-gradient(circle at 80% 10%, rgba(99, 102, 241, 0.14), transparent 40%);
    --mesh-3: radial-gradient(circle, rgba(34, 197, 94, 0.3), transparent 70%);
}

.light {
    --bg-base: #f1f5f9;
    --text-main: #0f172a;
    --text-muted: #475569;
    
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.05);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
    
    --input-bg: rgba(255, 255, 255, 0.9);
    --input-border: rgba(56, 189, 248, 0.3);
    
    --mesh-1: radial-gradient(circle at 20% 20%, rgba(56, 189, 248, 0.2), transparent 45%);
    --mesh-2: radial-gradient(circle at 80% 10%, rgba(99, 102, 241, 0.2), transparent 40%);
    --mesh-3: radial-gradient(circle, rgba(34, 197, 94, 0.4), transparent 70%);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-base);
    color: var(--text-main);
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

.bg-mesh {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background-image: var(--mesh-1), var(--mesh-2), var(--mesh-3);
    z-index: -1;
    pointer-events: none;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.btn-icon {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    outline: none;
}
.btn-icon:hover {
    transform: scale(1.1);
    border-color: var(--clr-primary);
}

.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 1.5rem;
    padding: 2.5rem;
    margin-bottom: 2rem;
}

.query-section h2 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.query-section p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 2rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
}

select {
    appearance: none;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--text-main);
    padding: 0.8rem 1rem;
    border-radius: 0.75rem;
    font-size: 0.95rem;
    font-family: inherit;
    outline: none;
    transition: all 0.2s;
    cursor: pointer;
}

select:focus {
    border-color: var(--input-focus);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

select:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, var(--clr-navy), var(--clr-primary));
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 0.75rem;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 1rem;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(56, 189, 248, 0.4);
}

.hidden {
    display: none !important;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.badge.success {
    background: rgba(34, 197, 94, 0.2);
    color: var(--clr-success);
    padding: 0.4rem 0.8rem;
    border-radius: 2rem;
    font-size: 0.8rem;
    font-weight: 600;
    border: 1px solid rgba(34, 197, 94, 0.3);
}

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

.stat-card {
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform 0.2s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card.highlight {
    border-color: var(--clr-primary);
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.05), rgba(30, 58, 138, 0.1));
}

.stat-icon {
    font-size: 2rem;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.5rem;
    border-radius: 0.75rem;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
}

@media (max-width: 640px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
    .glass-card {
        padding: 1.5rem;
    }
}