/* EduCraft AI - Rich Dark Educational Interface Styles */

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

:root {
    --primary-dark: #1a1a2e;
    --secondary-dark: #16213e;
    --accent-dark: #0f3460;
    --text-primary: #e8e8e8;
    --text-secondary: #b8b8b8;
    --text-muted: #888;
    --accent-blue: #4a9eff;
    --accent-purple: #7c3aed;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;
    --accent-pink: #ec4899;
    --card-bg: rgba(26, 26, 46, 0.8);
    --card-hover: rgba(26, 26, 46, 0.95);
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.2);
    --shadow-heavy: rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-dark) 50%, var(--accent-dark) 100%);
    min-height: 100vh;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

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

/* Header Styles */
.header {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
    box-shadow: 0 8px 32px var(--shadow-medium);
    position: relative;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(74, 158, 255, 0.1), rgba(124, 58, 237, 0.1));
    pointer-events: none;
}

.logo {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 30px rgba(74, 158, 255, 0.3);
    position: relative;
}

.tagline {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-weight: 300;
}

.powered-by {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.calance-logo {
    font-weight: 600;
    color: var(--accent-blue);
    text-shadow: 0 0 10px rgba(74, 158, 255, 0.3);
}

/* Main Content */
.main {
    padding: 3rem 0;
    position: relative;
    z-index: 1;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    text-shadow: 0 4px 8px var(--shadow-medium);
    background: linear-gradient(135deg, var(--text-primary), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.1rem;
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-weight: 300;
}

/* Subjects Grid */
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.subject-card {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 2.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 12px 40px var(--shadow-medium);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.subject-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(74, 158, 255, 0.05), rgba(124, 58, 237, 0.05));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.subject-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 50px var(--shadow-heavy);
    background: var(--card-hover);
    border-color: var(--accent-blue);
    z-index: 10;
}

.subject-card:hover::before {
    opacity: 1;
}

.subject-card:hover .subject-icon {
    transform: scale(1.05);
    filter: drop-shadow(0 0 15px rgba(74, 158, 255, 0.4));
}

.subject-icon {
    font-size: 4.5rem;
    margin-bottom: 1.5rem;
    display: block;
    transition: all 0.3s ease;
    filter: drop-shadow(0 4px 8px var(--shadow-light));
}

.subject-title {
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.8rem;
    text-shadow: 0 2px 4px var(--shadow-light);
}

.subject-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
    font-size: 0.95rem;
}

.subject-chapters {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 500;
    display: inline-block;
    box-shadow: 0 4px 12px rgba(74, 158, 255, 0.3);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* Chat Interface */
.chat-interface {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-dark);
    z-index: 1000;
    display: flex;
    flex-direction: column;
}

.chat-header {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
    padding: 1.5rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 8px 32px var(--shadow-medium);
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.chat-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
    pointer-events: none;
}

.back-button {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.back-button:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.chat-subject {
    font-size: 1.3rem;
    font-weight: 600;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.voice-toggle {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.voice-toggle:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.chat-messages {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
    background: var(--secondary-dark);
    position: relative;
}

.chat-messages::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 20%, rgba(74, 158, 255, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(124, 58, 237, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.welcome-message {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 8px 32px var(--shadow-medium);
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--accent-blue);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.message {
    margin-bottom: 1.5rem;
    padding: 1.2rem 1.8rem;
    border-radius: 16px;
    max-width: 80%;
    word-wrap: break-word;
    position: relative;
    backdrop-filter: blur(10px);
}

.message.user {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
    margin-left: auto;
    text-align: right;
    box-shadow: 0 8px 24px rgba(74, 158, 255, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.message.assistant {
    background: var(--card-bg);
    color: var(--text-primary);
    box-shadow: 0 8px 24px var(--shadow-medium);
    border-left: 4px solid var(--accent-blue);
    border: 1px solid var(--border-color);
}

.chat-input-container {
    padding: 1.5rem 2rem;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
}

.chat-form {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

#messageInput {
    flex: 1;
    padding: 1rem 1.2rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    background: var(--secondary-dark);
    color: var(--text-primary);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

#messageInput:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.1);
}

#messageInput::placeholder {
    color: var(--text-muted);
}

#sendButton {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
    border: none;
    padding: 1rem 1.8rem;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(74, 158, 255, 0.3);
}

#sendButton:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(74, 158, 255, 0.4);
}

#sendButton:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.voice-controls {
    text-align: center;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.voice-button {
    background: linear-gradient(135deg, var(--accent-green), #20c997);
    color: white;
    border: none;
    padding: 1rem 1.8rem;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 0.8rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.voice-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(16, 185, 129, 0.4);
}

.voice-status {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 26, 46, 0.95);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(20px);
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--accent-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1.5rem;
    box-shadow: 0 0 20px rgba(74, 158, 255, 0.3);
}

.loading-overlay p {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 500;
    text-shadow: 0 2px 4px var(--shadow-light);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .logo {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .subjects-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .subject-card {
        padding: 1.5rem;
    }
    
    .chat-header {
        padding: 1rem;
    }
    
    .chat-messages {
        padding: 1rem;
    }
    
    .chat-input-container {
        padding: 1rem;
    }
    
    .message {
        max-width: 95%;
    }
}

/* Animation for subject cards */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 12px 40px var(--shadow-medium);
    }
    50% {
        box-shadow: 0 12px 40px var(--shadow-medium), 0 0 30px rgba(74, 158, 255, 0.2);
    }
}

.subject-card {
    animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    opacity: 0;
}

.subject-card:nth-child(1) { animation-delay: 0.1s; }
.subject-card:nth-child(2) { animation-delay: 0.2s; }
.subject-card:nth-child(3) { animation-delay: 0.3s; }
.subject-card:nth-child(4) { animation-delay: 0.4s; }
.subject-card:nth-child(5) { animation-delay: 0.5s; }
.subject-card:nth-child(6) { animation-delay: 0.6s; }

/* Remove conflicting glow animation that was causing issues */

/* Custom scrollbar for chat messages */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--secondary-dark);
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--accent-blue);
    border-radius: 4px;
    opacity: 0.7;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    opacity: 1;
}