frontend/css/styles.css

:root {
    --primary: #4361ee;
    --primary-light: #4895ef;
    --secondary: #3f37c9;
    --accent: #4cc9f0;
    --light: #f8f9fa;
    --dark: #212529;
    --success: #4ade80;
    --warning: #facc15;
    --danger: #f87171;
    --gray: #6c757d;
    --light-gray: #e9ecef;
    --border-radius: 12px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
    color: var(--dark);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    padding: 30px 0;
    animation: fadeIn 0.8s ease-out;
}

header h1 {
    font-size: 2.8rem;
    margin-bottom: 10px;
    color: var(--secondary);
    background: linear-gradient(90deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

header p {
    font-size: 1.2rem;
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto;
}

.app-container {
    display: flex;
    gap: 30px;
    margin-top: 20px;
}

@media (max-width: 900px) {
    .app-container {
        flex-direction: column;
    }
}

.input-section {
    flex: 1;
    background: white;
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--shadow);
    animation: slideInLeft 0.6s ease-out;
}

.chat-section {
    flex: 1.5;
    display: flex;
    flex-direction: column;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    animation: slideInRight 0.6s ease-out;
}

.section-title {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--secondary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title i {
    background: var(--light-gray);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-area {
    border: 2px dashed var(--light-gray);
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    margin-bottom: 25px;
    transition: var(--transition);
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--primary);
    background: rgba(67, 97, 238, 0.05);
}

.upload-area i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.upload-area h3 {
    margin-bottom: 10px;
    color: var(--dark);
}

.upload-area p {
    color: var(--gray);
    margin-bottom: 20px;
}

.file-types {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 15px;
}

.file-type {
    background: var(--light-gray);
    padding: 8px 15px;
    border-radius: 30px;
    font-size: 0.9rem;
}

.url-input {
    margin-bottom: 25px;
}

.url-input label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.url-input input {
    width: 100%;
    padding: 14px;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

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

.btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 14px 25px;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn:hover {
    background: var(--secondary);
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

.btn-block {
    width: 100%;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

.file-list {
    margin-top: 25px;
}

.file-item {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    background: var(--light-gray);
    border-radius: var(--border-radius);
    margin-bottom: 10px;
    animation: fadeIn 0.3s ease-out;
}

.file-item i {
    margin-right: 12px;
    color: var(--primary);
}

.file-info {
    flex: 1;
}

.file-name {
    font-weight: 500;
    margin-bottom: 3px;
}

.file-size {
    font-size: 0.85rem;
    color: var(--gray);
}

.file-actions {
    display: flex;
    gap: 10px;
}

.file-actions button {
    background: none;
    border: none;
    color: var(--gray);
    cursor: pointer;
    font-size: 1.1rem;
    transition: var(--transition);
}

.file-actions button:hover {
    color: var(--danger);
}

.chat-header {
    background: var(--primary);
    color: white;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.chat-header img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: white;
    padding: 5px;
}

.chat-messages {
    flex: 1;
    padding: 25px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
    background: #f8fafc;
}

.message {
    max-width: 80%;
    padding: 18px;
    border-radius: var(--border-radius);
    animation: fadeIn 0.3s ease-out;
    position: relative;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.user-message {
    background: var(--primary-light);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 5px;
}

.bot-message {
    background: white;
    border: 1px solid var(--light-gray);
    align-self: flex-start;
    border-bottom-left-radius: 5px;
}

.message-header {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    font-weight: 600;
}

.message-header i {
    margin-right: 8px;
}

.message-content {
    line-height: 1.5;
}

.typing-indicator {
    display: flex;
    align-items: center;
    padding: 18px;
    background: white;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    align-self: flex-start;
    border-bottom-left-radius: 5px;
    width: 100px;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background: var(--gray);
    border-radius: 50%;
    margin: 0 3px;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(1) { animation-delay: 0s; }
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

.chat-input {
    display: flex;
    padding: 20px;
    background: white;
    border-top: 1px solid var(--light-gray);
}

.chat-input input {
    flex: 1;
    padding: 16px;
    border: 1px solid var(--light-gray);
    border-radius: 30px;
    font-size: 1rem;
    transition: var(--transition);
}

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

.chat-input button {
    background: var(--primary);
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin-left: 15px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.chat-input button:hover {
    background: var(--secondary);
    transform: scale(1.05);
}



@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes typing {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-5px); }
}

.processing {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px;
    color: var(--gray);
}

.processing i {
    font-size: 2rem;
    margin-right: 15px;
    color: var(--primary);
    animation: spin 1.5s linear infinite;
}

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

footer {
    text-align: center;
    padding: 30px 0;
    color: var(--gray);
    font-size: 0.9rem;
    margin-top: auto;
}

.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(67, 97, 238, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(67, 97, 238, 0); }
    100% { box-shadow: 0 0 0 0 rgba(67, 97, 238, 0); }
}