:root {
    --primary-color: #6C5CE7;
    --secondary-color: #A8A5FF;
    --accent-color: #e74c3c;
    --background-color: #F0F0FF;
    --card-background: #FFFFFF;
    --text-color: #2D3436;
    --border-radius: 12px;
    --box-shadow: 0 4px 6px rgba(108, 92, 231, 0.1);
    --bs-primary: #6C5CE7;
    --bs-primary-rgb: 108, 92, 231;
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header ve Navigasyon */
.header {
    background-color: var(--primary-color);
    padding: 1rem 0;
    box-shadow: var(--box-shadow);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    color: white;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    list-style: none;
}

.nav-item {
    position: relative;
    margin-left: 2rem;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: background-color 0.3s;
}

.nav-link:hover {
    background-color: rgba(255,255,255,0.1);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 0.5rem 0;
    min-width: 200px;
    display: none;
}

.nav-item:hover .dropdown-menu {
    display: block;
}

.dropdown-item {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--text-color);
    text-decoration: none;
    transition: background-color 0.3s;
}

.dropdown-item:hover {
    background-color: var(--background-color);
}

/* Ana İçerik */
.main {
    background: linear-gradient(135deg, var(--bs-primary) 0%, #A8A5FF 100%);
    min-height: calc(100vh - 56px);
    padding: 2rem 0;
}

.calculator-card {
    background: white;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(var(--bs-primary-rgb), 0.1);
    padding: 2rem;
}

.calculator-title {
    color: var(--primary-color);
    margin-bottom: 1rem;
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
}

.calculator-description {
    color: #666;
    margin-bottom: 2.5rem;
    text-align: center;
    font-size: 1.1rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Tarih Giriş Alanları */
.date-inputs {
    display: flex;
    gap: 2.5rem;
    margin-bottom: 2rem;
    background: var(--background-color);
    padding: 2rem;
    border-radius: var(--border-radius);
}

.date-section {
    background: #f8f9fa;
    border-radius: 0.75rem;
    padding: 1.5rem;
}

.date-section:first-child::after {
    content: '';
    position: absolute;
    right: -1.25rem;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 80%;
    background: rgba(0,0,0,0.1);
}

.date-section h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
    font-weight: 600;
}

.optional-text {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    font-style: italic;
    line-height: 1.4;
}

.birthday-input {
    display: grid;
    grid-template-columns: 80px 140px 100px;
    gap: 1rem;
    align-items: start;
}

/* Form Elemanları */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.4rem;
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.85rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 0.5rem;
    border: 2px solid #eee;
    border-radius: var(--border-radius);
    background: white;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.1);
}

/* Select elementleri için özel stil */
select.form-control {
    padding-right: 1.5rem;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' fill='%236C5CE7' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: calc(100% - 0.5rem) center;
    background-size: 10px;
}

/* Form Elemanları için Bootstrap Override */
.form-control, .form-select {
    padding: 0.4rem 0.5rem;
    font-size: 0.875rem;
}

.form-select {
    padding-right: 1.75rem;
    background-position: right 0.35rem center;
    background-size: 12px;
}

/* Sayı inputları için özel stil */
input[type="number"].form-control {
    text-align: center;
    -moz-appearance: textfield;
}

input[type="number"].form-control::-webkit-outer-spin-button,
input[type="number"].form-control::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* Form etiketleri */
.form-label {
    font-size: 0.8rem;
    margin-bottom: 0.25rem;
    color: #666;
}

/* Tarih bölümü başlıkları */
.date-section h3 {
    font-size: 1.1rem;
    color: var(--bs-primary);
    margin-bottom: 1rem;
}

/* Hesapla Butonu */
.btn-calculate {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 1.25rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    transition: all 0.3s ease;
    margin-top: 2rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-calculate:hover {
    background: #5849c4;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.2);
}

/* Sonuç Alanı */
.age-result {
    margin-top: 2rem;
    padding: 2rem;
    background: var(--background-color);
    border-radius: var(--border-radius);
}

.age-result-title {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.age-detail {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.birth-info, .next-birthday {
    margin-top: 1rem;
    color: #666;
}

.birth-info strong, .next-birthday strong {
    color: var(--text-color);
    display: block;
    margin-top: 0.5rem;
}

/* How to use section */
.how-to-use {
    margin-top: 3rem;
    padding: 2rem;
    background: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.how-to-use h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.how-to-use p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 1rem;
}

/* Kredi Hesaplama Formu */
.calculator-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

.input-group {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
}

.input-group .form-control {
    flex: 1;
}

.input-prefix {
    background: var(--background-color);
    padding: 0.75rem 1rem;
    border: 1px solid #ddd;
    border-right: none;
    border-radius: var(--border-radius) 0 0 var(--border-radius);
    color: var(--text-color);
}

.input-group .form-control {
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

/* Diğer Hesaplayıcılar */
.other-calculators {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
}

.other-calculators h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.calculator-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid #eee;
    text-decoration: none;
    color: var(--text-color);
    transition: background-color 0.3s;
}

.calculator-item:last-child {
    border-bottom: none;
}

.calculator-item:hover {
    background-color: var(--background-color);
}

.calculator-icon {
    width: 40px;
    height: 40px;
    margin-right: 1rem;
    background: var(--background-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calculator-info h3 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.calculator-info p {
    font-size: 0.875rem;
    color: #666;
    margin: 0;
}

/* Sonuç Kartları */
.result-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 2rem;
}

.result-item {
    background: var(--primary-color);
    color: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    text-align: center;
}

.result-item h3 {
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.result-item .value {
    font-size: 1.5rem;
    font-weight: bold;
}

/* Responsive Tasarım */
@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .nav-menu {
        margin-top: 1rem;
        flex-direction: column;
        width: 100%;
    }
    
    .nav-item {
        margin: 0.5rem 0;
    }
    
    .dropdown-menu {
        position: static;
        box-shadow: none;
        margin-left: 1rem;
    }
    
    .date-inputs {
        flex-direction: column;
        gap: 2rem;
        padding: 1.5rem;
    }
    
    .date-section {
        padding: 1.5rem;
    }
    
    .date-section:first-child::after {
        display: none;
    }
    
    .birthday-input {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.5rem;
    }
    
    .form-control, .form-select {
        font-size: 16px; /* iOS'ta zoom'u engellemek için */
        padding: 0.375rem 0.5rem;
    }
    
    .form-label {
        font-size: 0.875rem;
    }
    
    .calculator-title {
        font-size: 2rem;
    }
    
    .calculator-card {
        padding: 1.5rem;
        margin: 1rem;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .birthday-input {
        grid-template-columns: 70px 120px 90px;
        gap: 0.75rem;
    }
    
    .form-control {
        padding: 0.6rem 0.4rem;
        font-size: 0.85rem;
    }
}

@media (max-width: 992px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
    
    .result-grid {
        grid-template-columns: 1fr;
    }
}