/* Base Styles & Reset */
:root {
    --primary-color: #4361ee;
    --primary-dark: #3a56d4;
    --secondary-color: #7209b7;
    --accent-color: #f72585;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --border-color: #dee2e6;
    --success-color: #38b000;
    --warning-color: #f9c74f;
    --danger-color: #e63946;
    --info-color: #4cc9f0;
    
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f5f7fa;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

h1 {
    font-size: 2.5rem;
    color: var(--primary-dark);
}

h2 {
    font-size: 1.8rem;
}

h3 {
    font-size: 1.4rem;
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header & Navigation */
header {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.logo {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 1.4rem;
    color: var(--primary-color);
}

.logo i {
    margin-right: 0.5rem;
    font-size: 1.6rem;
}

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

.main-nav li {
    margin-left: 1.5rem;
}

.main-nav a {
    color: var(--dark-color);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.main-nav a:hover, .main-nav a.active {
    color: var(--primary-color);
    background-color: rgba(67, 97, 238, 0.1);
}

/* Main Content */
main {
    padding: 2rem 0 4rem;
}

.hero {
    text-align: center;
    padding: 2rem 0 3rem;
}

.subtitle {
    color: var(--gray-color);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

/* Analysis Panel */
.analysis-panel {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    margin-bottom: 2rem;
}

.input-section {
    padding: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.input-section h2 {
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
}

.input-section h2 i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

textarea {
    width: 100%;
    height: 120px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    margin-bottom: 1rem;
    transition: var(--transition);
    resize: vertical;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
}

button i {
    margin-right: 0.5rem;
}

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

button:active {
    transform: translateY(0);
}

/* Results Section */
.result-section {
    padding: 2rem;
    display: none;
}

.result-section h2 {
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
}

.result-section h2 i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

.emotion-card {
    display: flex;
    align-items: center;
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.emotion-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-right: 1.5rem;
}

.emotion-details h3 {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
    color: var(--gray-color);
}

.emotion-value {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--primary-dark);
}

.chart-container {
    margin-top: 2rem;
}

.chart-container h3 {
    margin-bottom: 1rem;
    color: var(--gray-color);
}

/* Loading */
.loading {
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 3rem 0;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(67, 97, 238, 0.2);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Info Section */
.info-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

.info-card {
    background-color: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.info-card:hover {
    transform: translateY(-5px);
}

.info-card i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.info-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
}

/* Footer */
footer {
    background-color: white;
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
    color: var(--gray-color);
}

/* LSTM Page Specific Styles */
.content-section {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    margin-bottom: 2rem;
}

.content-section h2 {
    color: var(--primary-dark);
    font-size: 1.8rem;
    margin-top: 2rem;
    margin-bottom: 1.2rem;
    padding-left: 1rem;
    border-left: 4px solid var(--primary-color);
}

.content-section h3 {
    color: var(--secondary-color);
    font-size: 1.4rem;
    margin-top: 1.8rem;
    margin-bottom: 1rem;
}

.content-section p {
    margin-bottom: 1.2rem;
    line-height: 1.7;
    text-align: justify;
}

.content-section ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.content-section li {
    margin-bottom: 0.8rem;
    line-height: 1.7;
}

.content-section li strong {
    color: var(--secondary-color);
}

.image-container {
    margin: 2rem 0;
    text-align: center;
}

.image-container img {
    max-width: 90%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: transform 0.3s ease;
}

.image-container img:hover {
    transform: scale(1.02);
}

/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    .header-container {
        flex-direction: column;
        padding: 1rem;
    }
    
    .logo {
        margin-bottom: 1rem;
    }
    
    .main-nav ul {
        flex-direction: column;
        text-align: center;
    }
    
    .main-nav li {
        margin: 0.5rem 0;
    }
    
    .info-section {
        grid-template-columns: 1fr;
    }
    
    .input-section, .result-section {
        padding: 1.5rem;
    }
    
    .emotion-card {
        flex-direction: column;
        text-align: center;
    }
    
    .emotion-icon {
        margin: 0 0 1rem 0;
    }
    
    .content-section {
        padding: 1.5rem;
    }
    
    .image-container img {
        max-width: 100%;
    }
}

/* Language Selector Styles - Thêm vào file style.css hiện có */

.language-selector {
    margin-left: 20px;
}

.language-btn {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 5px 10px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.language-btn:hover {
    background-color: rgba(67, 97, 238, 0.1);
    transform: translateY(-2px);
}

.language-btn i {
    margin-right: 5px;
    font-size: 1rem;
}

.current-lang {
    font-weight: bold;
}

/* Responsive adjustments for language selector */
@media (max-width: 768px) {
    .header-container {
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }
    
    .language-selector {
        margin-left: 0;
        margin-top: 10px;
    }
}