/* Curotherapy Clinical Study Website - Multilingual Professional Design */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

/* Language Support */
html[lang="zh"] body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', 'WenQuanYi Micro Hei', sans-serif;
}

html[lang="fr"] body {
    font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
}

/* Typography */
h1 {
    font-size: 2.5rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 1rem;
}

h2 {
    font-size: 2rem;
    font-weight: 500;
    color: #34495e;
    margin-bottom: 1rem;
    border-bottom: 2px solid #3498db;
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.5rem;
    font-weight: 500;
    color: #2c3e50;
    margin-bottom: 0.8rem;
}

p {
    margin-bottom: 1rem;
    color: #555;
}

/* Language Selector */
.language-selector {
    position: relative;
    display: inline-block;
}

.language-dropdown {
    background: #34495e;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background 0.3s ease;
}

.language-dropdown:hover {
    background: #2c3e50;
}

.language-dropdown::after {
    content: '▼';
    font-size: 0.7rem;
}

.language-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    min-width: 150px;
    z-index: 1000;
    display: none;
}

.language-menu.show {
    display: block;
}

.language-option {
    display: block;
    padding: 0.7rem 1rem;
    color: #333;
    text-decoration: none;
    border-bottom: 1px solid #eee;
    transition: background 0.3s ease;
}

.language-option:last-child {
    border-bottom: none;
}

.language-option:hover {
    background: #f8f9fa;
}

.language-option.active {
    background: #3498db;
    color: white;
}

.flag-icon {
    width: 20px;
    height: 15px;
    margin-right: 0.5rem;
    border-radius: 2px;
}

/* Header */
.header {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: 600;
    color: #3498db;
}

.nav {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav a:hover {
    color: #3498db;
}

/* Main Content */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.main-content {
    background: white;
    margin: 2rem auto;
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    color: white;
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: #ecf0f1;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    background: #e74c3c;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn:hover {
    background: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
}

.btn-secondary {
    background: #95a5a6;
}

.btn-secondary:hover {
    background: #7f8c8d;
}

.btn-large {
    padding: 1.2rem 2.5rem;
    font-size: 1.1rem;
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.card h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.card-icon {
    font-size: 3rem;
    color: #3498db;
    margin-bottom: 1rem;
}

/* Study Info Sections */
.study-section {
    margin: 3rem 0;
    padding: 2rem;
    background: #f8f9fa;
    border-left: 4px solid #3498db;
    border-radius: 0 8px 8px 0;
}

.study-section h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

/* Process Steps */
.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.step {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    position: relative;
}

.step-number {
    width: 50px;
    height: 50px;
    background: #3498db;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0 auto 1rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #2c3e50;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #3498db;
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.table th,
.table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.table th {
    background: #34495e;
    color: white;
    font-weight: 600;
}

.table tr:hover {
    background: #f8f9fa;
}

/* Alert Boxes */
.alert {
    padding: 1rem 1.5rem;
    margin: 1rem 0;
    border-radius: 5px;
    border-left: 4px solid;
}

.alert-info {
    background: #d1ecf1;
    border-color: #3498db;
    color: #0c5460;
}

.alert-warning {
    background: #fff3cd;
    border-color: #f39c12;
    color: #856404;
}

.alert-success {
    background: #d4edda;
    border-color: #27ae60;
    color: #155724;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer h4 {
    color: #3498db;
    margin-bottom: 1rem;
}

.footer p,
.footer a {
    color: #bdc3c7;
    text-decoration: none;
}

.footer a:hover {
    color: #3498db;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    margin-top: 2rem;
    border-top: 1px solid #34495e;
    color: #95a5a6;
}

/* Professional Trust Elements */
.trust-badges {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    margin: 2rem 0;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.trust-badge {
    text-align: center;
    color: #7f8c8d;
    font-size: 0.9rem;
}

.trust-badge i {
    font-size: 2rem;
    color: #27ae60;
    margin-bottom: 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .header-right {
        flex-direction: column;
        gap: 1rem;
        width: 100%;
    }
    
    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .main-content {
        padding: 2rem 1rem;
        margin: 1rem;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .language-menu {
        right: auto;
        left: 0;
    }
}

/* RTL Support for Arabic/Hebrew if needed later */
[dir="rtl"] .language-menu {
    right: auto;
    left: 0;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.p-1 { padding: 1rem; }
.p-2 { padding: 2rem; }

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}