/* Modern Medical UI Stylesheet */

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

:root {
    --primary-color: #1e3a8a;
    --secondary-color: #0d9488;
    --accent-color: #f59e0b;
    --danger-color: #dc2626;
    --success-color: #059669;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

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

/* Navbar */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem 0;
    box-shadow: var(--shadow);
}

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

.nav-brand h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

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

.nav-link:hover {
    opacity: 0.8;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #1e3a8a 0%, #0d9488 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Mode Selection */
.mode-selection {
    padding: 3rem 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.mode-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.mode-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    text-align: center;
}

.mode-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.mode-card-featured {
    border: 2px solid var(--accent-color);
}

.mode-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.mode-card h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.mode-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.feature-list {
    list-style: none;
    text-align: left;
    margin: 1.5rem 0;
}

.feature-list li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #1e40af;
}

.btn-featured {
    background-color: var(--accent-color);
    color: white;
}

.btn-featured:hover {
    background-color: #f59e0b;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    width: 100%;
    margin-top: 1rem;
}

/* Steps */
.info-section {
    padding: 3rem 0;
    background: white;
    border-radius: 12px;
    margin-top: 3rem;
    box-shadow: var(--shadow);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
    padding: 2rem;
}

.step {
    text-align: center;
}

.step-number {
    width: 50px;
    height: 50px;
    background: var(--secondary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto 1rem;
}

.step h5 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

/* Upload Section */
.upload-section {
    padding: 2rem 0;
}

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

.upload-container {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    max-width: 800px;
    margin: 0 auto;
}

.upload-group {
    margin-bottom: 2rem;
}

.upload-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.upload-box {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
}

.upload-box:hover {
    border-color: var(--secondary-color);
    background-color: #f0fdfa;
}

.upload-box input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0;
    cursor: pointer;
}

.upload-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 1rem;
}

.upload-placeholder p {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.upload-placeholder small {
    color: var(--text-secondary);
}

.image-preview {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
}

/* Results Section */
.results-section {
    margin-top: 2rem;
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.result-header {
    text-align: center;
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.result-header.success {
    background: linear-gradient(135deg, #059669, #10b981);
    color: white;
}

.result-header.warning {
    background: linear-gradient(135deg, #dc2626, #ef4444);
    color: white;
}

.result-prediction {
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.result-confidence {
    font-size: 1.2rem;
    opacity: 0.9;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.result-card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
}

.result-card h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.result-image {
    width: 100%;
    border-radius: 8px;
    margin-top: 1rem;
}

.clinical-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}

.feature-item {
    background: var(--bg-color);
    padding: 1rem;
    border-radius: 8px;
}

.feature-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.feature-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.interpretation {
    background: #eff6ff;
    border-left: 4px solid var(--primary-color);
    padding: 1rem;
    margin-top: 1.5rem;
    border-radius: 4px;
}

/* Error Message */
.error-message {
    background: #fee2e2;
    border: 1px solid #dc2626;
    color: #dc2626;
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
}

/* Loader */
.loader {
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
    display: inline-block;
    margin-left: 0.5rem;
}

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

/* About Page */
.about-section {
    padding: 2rem 0;
}

.about-content {
    display: grid;
    gap: 2rem;
}

.about-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.about-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.about-card ul, .about-card ol {
    margin-left: 1.5rem;
    color: var(--text-secondary);
}

.about-card li {
    margin-bottom: 0.5rem;
}

.conditions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 1rem;
}

.disclaimer {
    background: #fef3c7;
    border-left: 4px solid var(--accent-color);
    padding: 1rem;
    border-radius: 4px;
    color: #92400e;
}

/* Footer */
.footer {
    background: var(--primary-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .mode-cards {
        grid-template-columns: 1fr;
    }
    
    .result-grid {
        grid-template-columns: 1fr;
    }
}