:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --background-color: #f5f6fa;
    --text-color: #2c3e50;
    --card-background: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --border-radius: 10px;
    --transition: all 0.3s ease;
    --transition-fast: all 0.2s ease;
    --max-width: 1200px;
    --grid-size: 50px;
    --grid-color: rgba(52, 152, 219, 0.1); /* Soluk mavi */
    --subgrid-color: rgba(52, 152, 219, 0.05); /* Daha soluk mavi */
}

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

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
    background-image: 
        /* Ana kareler için çizgiler */
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px),
        /* Alt kareler için çizgiler */
        linear-gradient(var(--subgrid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--subgrid-color) 1px, transparent 1px);
    background-size: 
        var(--grid-size) var(--grid-size),
        var(--grid-size) var(--grid-size),
        calc(var(--grid-size) / 5) calc(var(--grid-size) / 5),
        calc(var(--grid-size) / 5) calc(var(--grid-size) / 5);
    background-position: center center;
}

/* Dark mode için arka plan ayarı */
@media (prefers-color-scheme: dark) {
    body {
        background-image: 
            linear-gradient(rgba(52, 152, 219, 0.15) 1px, transparent 1px),
            linear-gradient(90deg, rgba(52, 152, 219, 0.15) 1px, transparent 1px),
            linear-gradient(rgba(52, 152, 219, 0.1) 1px, transparent 1px),
            linear-gradient(90deg, rgba(52, 152, 219, 0.1) 1px, transparent 1px);
    }
}

/* Header styles */
header {
    background: var(--primary-color);
    padding: 0.5rem 1rem;
    width: 100%;
}

nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    max-width: var(--max-width);
    margin: 0 auto;
    min-width: fit-content; /* İçeriğe göre minimum genişlik */
}

.logo {
    margin-right: auto;
    min-width: fit-content; /* Logo için minimum genişlik */
}

.logo a {
    color: white;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: bold;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin: 0;
    padding: 0;
    list-style: none;
    white-space: nowrap;
    min-width: fit-content; /* Menü için minimum genişlik */
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-size: 1rem;
    transition: var(--transition-fast);
}

@media (max-width: 768px) {
    header {
        padding: 0.3rem 0.8rem;
        overflow-x: auto; /* Yatay scroll ekle */
        -webkit-overflow-scrolling: touch;
    }

    nav {
        justify-content: space-between;
        width: max-content; /* İçeriğe göre genişlik */
        padding-right: 1rem; /* Sağ tarafta biraz boşluk */
    }

    .logo a {
        font-size: 1.1rem;
    }

    .nav-links {
        gap: 0.8rem;
    }

    .nav-links a {
        font-size: 0.9rem;
    }
}

/* Ana Sayfa Grid */
.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.calculator-card {
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.calculator-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.calculator-card h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.calc-button {
    display: inline-block;
    background: var(--secondary-color);
    color: #fff;
    padding: 0.8rem 1.5rem;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 1rem;
    transition: var(--transition);
}

.calc-button:hover {
    background: var(--primary-color);
    transform: scale(1.05);
}

/* Calculator Container */
.calculator-container {
    max-width: 800px;
    margin: 3rem auto;
    padding: 2.5rem;
    background: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    animation: fadeIn 0.5s ease-out;
}

.calculator-container h1 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
    font-weight: 600;
}

.input-fields {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 600px;
    margin: 0 auto;
}

.input-fields label {
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    display: block;
}

.input-fields input,
.input-fields select {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    background: #fff;
}

.input-fields textarea {
    width: 100%;
    min-height: 300px;
    padding: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    line-height: 1.6;
    transition: var(--transition);
    resize: vertical;
    font-family: 'Poppins', sans-serif;
    background: #fff;
}

.input-fields input:focus,
.input-fields select:focus,
.input-fields textarea:focus {
    border-color: var(--secondary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.input-fields button {
    background: var(--secondary-color);
    color: #fff;
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 500;
    transition: var(--transition);
    margin-top: 1rem;
}

.input-fields button:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.input-fields button:active {
    transform: translateY(0);
}

.result {
    margin-top: 2rem;
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 8px;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 500;
    border: 2px solid #e0e0e0;
}

/* Responsive Tasarım */
.nav-toggle {
    display: none;
}

.nav-toggle-label {
    display: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .nav-toggle-label {
        display: block;
    }

    .nav-links {
        display: none;
        width: 100%;
        position: absolute;
        top: 100%;
        left: 0;
        background: var(--primary-color);
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }

    .nav-toggle:checked ~ .nav-links {
        display: flex;
    }

    .calculator-container {
        margin: 1.5rem;
        padding: 1.5rem;
    }

    .calculator-container h1 {
        font-size: 1.5rem;
    }

    .input-fields {
        gap: 1rem;
    }
}

/* Özel Calculator Stilleri */
.shape-selector,
.unit-selector {
    margin-bottom: 1.5rem;
    text-align: center;
}

.shape-selector select,
.unit-selector select {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.date-inputs {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 400px;
    margin: 0 auto;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.stats .result {
    margin-top: 0;
    background: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

/* Animasyonlar */
@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* Age Calculator Özel Stilleri */
.detailed-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.stat-item {
    background: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 2px solid #e0e0e0;
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.stat-item i {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.stat-item .stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin: 0.5rem 0;
}

.stat-item .stat-label {
    display: block;
    color: #666;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .detailed-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .detailed-stats {
        grid-template-columns: 1fr;
    }
}

/* Calculator Info Section Styles */
.calculator-info {
    max-width: 800px;
    margin: 3rem auto;
    padding: 0 1.5rem;
}

.info-section {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.info-section h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary-color);
}

.info-section p {
    color: #666;
    line-height: 1.8;
    margin-bottom: 1rem;
}

.info-section ul,
.info-section ol {
    padding-left: 1.5rem;
    color: #666;
}

.info-section li {
    margin-bottom: 0.8rem;
    line-height: 1.6;
}

.info-section ul li::marker {
    color: var(--secondary-color);
}

.info-section ol li::marker {
    color: var(--secondary-color);
    font-weight: 600;
}

@media (max-width: 768px) {
    .calculator-info {
        margin: 2rem auto;
    }
    
    .info-section {
        padding: 1.5rem;
        margin-bottom: 1.5rem;
    }
}

/* Footer Styles */
footer {
    background: var(--primary-color);
    color: #fff;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
    position: relative;
    z-index: 1;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8); /* Koyu overlay */
    z-index: -1;
}

.footer-content {
    position: relative; /* Overlay üzerinde görünmesi için */
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-section h3 {
    color: var(--secondary-color); /* Başlıklar için belirgin renk */
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary-color);
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    margin-bottom: 0.8rem;
}

.footer-section ul li a {
    color: #fff; /* Beyaz yerine tam beyaz */
    text-decoration: none;
    transition: var(--transition);
    opacity: 0.9; /* Hafif transparanlık */
}

.footer-section ul li a:hover {
    color: var(--secondary-color);
    opacity: 1;
    padding-left: 0.5rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    color: #fff;
    font-size: 1.5rem;
    transition: var(--transition);
    opacity: 0.9;
}

.social-links a:hover {
    color: var(--secondary-color);
    opacity: 1;
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2); /* Daha belirgin çizgi */
}

.footer-bottom p {
    color: #fff;
    opacity: 0.9;
    font-size: 0.9rem;
}

/* Dark Mode Footer Adjustments */
@media (prefers-color-scheme: dark) {
    footer::before {
        background: rgba(0, 0, 0, 0.9); /* Dark mode'da daha koyu overlay */
    }
    
    .footer-section h3 {
        color: var(--secondary-color);
    }

    .footer-section ul li a,
    .social-links a {
        color: #fff;
        opacity: 0.9;
    }

    .footer-section ul li a:hover,
    .social-links a:hover {
        color: var(--secondary-color);
        opacity: 1;
    }
}

/* Common Page Styles */
.page-container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

.page-container h1 {
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
    font-size: 2.5rem;
}

.content-section {
    background: var(--card-background);
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.content-section h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.content-section p {
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.content-section ul {
    list-style-type: none;
    padding-left: 0;
    margin-bottom: 1.5rem;
}

.content-section ul li {
    margin-bottom: 0.8rem;
    padding-left: 1.5rem;
    position: relative;
}

.content-section ul li::before {
    content: "•";
    color: var(--secondary-color);
    position: absolute;
    left: 0;
}

/* Contact Form Styles */
.contact-form {
    max-width: 600px;
    margin: 2rem auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    background: var(--input-background);
    color: var(--text-color);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(var(--primary-rgb), 0.1);
}

.contact-form button {
    width: 100%;
    padding: 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
}

.contact-form button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* Contact Methods Styles */
.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.contact-method {
    text-align: center;
    padding: 2rem;
    background: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.contact-method:hover {
    transform: translateY(-5px);
}

.contact-method i {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.contact-method h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .page-container {
        margin: 1rem auto;
    }

    .page-container h1 {
        font-size: 2rem;
    }

    .content-section {
        padding: 1.5rem;
    }

    .contact-methods {
        grid-template-columns: 1fr;
    }
}

/* Dark Mode Adjustments */
@media (prefers-color-scheme: dark) {
    .content-section {
        background: var(--dark-card-background);
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
        background: var(--dark-input-background);
        border-color: var(--dark-border);
    }

    .contact-method {
        background: var(--dark-card-background);
    }
}

/* Ad Placement Styles */
.ad-container {
    width: 100%;
    max-width: 800px;
    margin: 2rem auto;
    text-align: center;
    overflow: hidden;
    min-height: 90px; /* Minimum reklam yüksekliği */
}

/* Generic calculator UI (aligned with BMI page aesthetics) */
.calculator-header {
  text-align: center;
  margin-bottom: 3rem;
}
.calculator-header h1 {
  font-size: 3rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}
.calculator-header p {
  font-size: 1.2rem;
  color: var(--light-text);
}
.calculator-content {
  background: var(--white);
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}
.calculator-form {
  max-width: 500px;
  margin: 0 auto;
}
.form-group { margin-bottom: 1.5rem; }
.form-group label {
  display: block;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}
.form-group input, .form-group select, .calculator-form input, .calculator-form select {
  width: 100%;
  padding: 1rem;
  border: 2px solid #e0e0e0;
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: var(--transition);
  background: var(--background-color);
}
.form-group input:focus, .form-group select:focus, .calculator-form input:focus, .calculator-form select:focus {
  outline: none;
  border-color: var(--secondary-color);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
  background: var(--white);
}
.calculate-btn, .calculator-form button {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--white);
  border: none;
  padding: 1rem 2rem;
  border-radius: var(--border-radius);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.calculate-btn:hover, .calculator-form button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
  background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
}
.calculator-result {
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border-radius: var(--border-radius);
  padding: 2rem;
  text-align: center;
  margin-top: 2rem;
  border-left: 4px solid var(--secondary-color);
}
@media (max-width: 768px) {
  .calculator-header h1 { font-size: 2.5rem; }
  .calculator-content { padding: 1.5rem; }
}

/* Fallback: pages that still use legacy classes/IDs */
.input-fields { max-width: 500px; margin: 0 auto; }
.input-fields label {
  display: block;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}
.input-fields input, .input-fields select {
  width: 100%;
  padding: 1rem;
  border: 2px solid #e0e0e0;
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: var(--transition);
  background: var(--background-color);
}
.input-fields input:focus, .input-fields select:focus {
  outline: none;
  border-color: var(--secondary-color);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
  background: var(--white);
}
#calcBtn, #toggleScheduleBtn {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--white);
  border: none;
  padding: 1rem 2rem;
  border-radius: var(--border-radius);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  text-transform: uppercase;
  letter-spacing: 1px;
}
#calcBtn:hover, #toggleScheduleBtn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
  background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
}

.ad-container-sidebar {
    width: 300px;
    margin: 1rem auto;
    min-height: 250px;
}

.ad-label {
    font-size: 0.8rem;
    color: #666;
    text-align: center;
    margin-bottom: 0.5rem;
}

@media (max-width: 768px) {
    .ad-container {
        margin: 1rem auto;
    }
}