:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: rgba(255, 255, 255, 0.1);
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --success: #10b981;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #f59e0b;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-color);
    background-image: radial-gradient(circle at top right, rgba(59, 130, 246, 0.15), transparent 40%),
                      radial-gradient(circle at bottom left, rgba(16, 185, 129, 0.1), transparent 40%);
    color: var(--text-main);
    min-height: 100vh;
}

.app-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 10px;
    padding-top: 10px;
}

header h1 {
    font-size: 20px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 4px;
}

header p {
    font-size: 13px;
    color: var(--text-muted);
}

.glass {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 10px;
    margin-bottom: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.glass-dark {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 12px;
    padding: 10px;
    margin-bottom: 8px;
}

h2 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Segmented Control (iOS style Radio Buttons) */
.segmented-control {
    display: flex;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    padding: 4px;
}

.segmented-control input[type="radio"] {
    display: none;
}

.segmented-control label {
    flex: 1;
    text-align: center;
    padding: 6px 0;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.segmented-control input[type="radio"]:checked + label {
    background: var(--primary);
    color: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* Form Inputs */
.form-group {
    margin-bottom: 8px;
}

.form-group label {
    display: block;
    font-size: 13px;
    color: var(--text-main);
    margin-bottom: 4px;
    font-weight: 500;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper input {
    width: 100%;
    background: rgba(0,0,0,0.2);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 10px;
    padding: 8px 40px 8px 10px;
    font-size: 16px;
    font-weight: 600;
    color: white;
    transition: border-color 0.3s;
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--primary);
}

.input-wrapper input:disabled {
    opacity: 0.4;
}

.currency {
    position: absolute;
    right: 16px;
    color: var(--text-muted);
    font-weight: 600;
    pointer-events: none;
}

.kdv-group {
    display: flex;
    gap: 16px;
    align-items: center;
}

.half {
    flex: 1;
}

/* Custom Select */
.custom-select select {
    width: 100%;
    appearance: none;
    background: rgba(0,0,0,0.2) url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3A%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3A%22292.4%22%20height%3A%22292.4%22%3E%3Cpath%20fill%3A%22%2394a3b8%22%20d%3A%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E") no-repeat right 16px center;
    background-size: 10px;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 10px;
    padding: 8px 10px;
    font-size: 15px;
    font-weight: 600;
    color: white;
}
.custom-select select:disabled {
    opacity: 0.5;
}

/* Toggle Switch */
.checkbox-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-top: 10px;
}
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 28px;
    margin-bottom: 6px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(0,0,0,0.4);
    border: 1px solid rgba(255,255,255,0.1);
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 2px;
    bottom: 2px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--success);
    border-color: var(--success);
}

input:checked + .slider:before {
    transform: translateX(22px);
}

.toggle-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

/* Info Box */
.info-text {
    display: flex;
    gap: 12px;
    margin-top: 10px;
    padding: 8px;
    background: rgba(59, 130, 246, 0.1);
    border-left: 4px solid var(--primary);
    border-radius: 8px;
    font-size: 12px;
    line-height: 1.4;
    color: #cbd5e1;
}

.info-text .icon {
    font-size: 16px;
}

/* Results */
.result-card h2 {
    margin-bottom: 10px;
}
.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}
.result-row:last-child {
    margin-bottom: 0;
}
.result-row span {
    font-size: 13px;
    color: var(--text-muted);
}
.result-row strong {
    font-size: 15px;
    color: white;
}
.highlight {
    color: var(--accent) !important;
}
.highlight-kdv {
    color: #ef4444 !important;
}

.divider {
    height: 1px;
    background: rgba(255,255,255,0.1);
    margin: 8px 0;
}

/* --- MASAÜSTÜ: Merkezde Tek Sütun --- */
@media (min-width: 768px) {
    .app-container {
        max-width: 550px;
        padding: 20px 10px;
    }
}

/* --- MOBİL: Tek Ekrana Sığdır (Kompakt) --- */
@media (max-width: 767px) {
    .app-container {
        padding: 10px;
    }
    header {
        padding-top: 5px;
        margin-bottom: 12px;
    }
    header h1 {
        font-size: 20px;
    }
    header p {
        font-size: 12px;
    }
    .glass, .glass-dark {
        padding: 12px 14px;
        margin-bottom: 10px;
        border-radius: 12px;
    }
    h2 {
        font-size: 13px;
        margin-bottom: 10px;
    }
    .segmented-control label {
        padding: 8px 0;
        font-size: 13px;
    }
    .form-group {
        margin-bottom: 12px;
    }
    .form-group label {
        font-size: 13px;
        margin-bottom: 6px;
    }
    .input-wrapper input {
        padding: 10px 45px 10px 12px;
        font-size: 16px;
    }
    .custom-select select {
        padding: 10px 12px;
    }
    .toggle-switch {
        width: 44px;
        height: 24px;
    }
    .slider:before {
        height: 18px;
        width: 18px;
    }
    input:checked + .slider:before {
        transform: translateX(20px);
    }
    .info-text {
        margin-top: 10px;
        padding: 10px;
        font-size: 12px;
    }
    .result-card h2 {
        margin-bottom: 12px;
    }
    .result-row {
        margin-bottom: 10px;
    }
    .result-row span {
        font-size: 13px;
    }
    .result-row strong {
        font-size: 15px;
    }
    .divider {
        margin: 12px 0;
    }
    #res-total {
        font-size: 16px !important;
    }
}

/* Animasyonlu Araba */
.moving-car {
    display: inline-block;
    animation: driveCar 2s infinite alternate ease-in-out;
}

@keyframes driveCar {
    0% { transform: translateX(-5px) translateY(0); }
    50% { transform: translateX(5px) translateY(-2px); }
    100% { transform: translateX(10px) translateY(0); }
}

/* WHATSAPP FLOAT */
.whatsapp-float {
    position: fixed;
    width: 35px;
    height: 35px;
    bottom: 30px;
    left: 30px;
    background-color: #25d366;
    color: #FFF;
    border-radius: 50px;
    text-align: center;
    font-size: 18px;
    box-shadow: 2px 2px 8px rgba(0,0,0,0.3);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s, transform 0.3s;
    animation: pulse-wa 2s infinite;
    text-decoration: none;
    cursor: grab;
}
.whatsapp-float:active {
    cursor: grabbing;
}
.whatsapp-float:hover {
    background-color: #128C7E;
    transform: scale(1.1);
    color: #FFF;
}
@keyframes pulse-wa {
    0% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7); }
    70% { box-shadow: 0 0 0 10px rgba(37, 211, 102, 0); }
    100% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0); }
}