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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
    overflow-x: hidden;
}

html, body {
    height: auto;
    overflow-x: hidden;
    overflow-y: auto;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2563eb;
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-logo a:hover {
    color: #1d4ed8;
}

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

.nav-link {
    color: #374151;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: #2563eb;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #2563eb;
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: #374151;
    margin: 3px 0;
    transition: 0.3s;
}

/* Sections */
.section {
    display: none;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
    margin-bottom: 0;
    padding-bottom: 0;
    overflow: visible !important;
}

#home.section {
    min-height: 100vh;
    padding-top: 100px;
}

.section:not(#home) {
    padding-top: 70px;
    min-height: unset;
    overflow: visible !important;
}

.section.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

/* Home Section */
#home {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.highlight {
    color: #fbbf24;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    opacity: 0.8;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
}

.btn {
    padding: 12px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: #fbbf24;
    color: #1f2937;
}

.btn-primary:hover {
    background: #f59e0b;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(251, 191, 36, 0.3);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #1f2937;
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-item h3 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #fbbf24;
    margin-bottom: 0.5rem;
}

.stat-item p {
    font-size: 1rem;
    opacity: 0.8;
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
    margin-top: 40px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #6b7280;
    font-weight: 500;
}

/* Project Sections */
.project-content {
    max-width: 1200px;
    margin: 0 auto;
}

.project-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: stretch;
    min-height: 80vh;
}

.project-info-column {
    display: flex;
    flex-direction: column;
}

.project-info {
    background: #f9fafb;
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    height: 100%;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.project-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.project-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.project-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin: 2rem 0;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
}

.stat-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin: 0 auto 0.75rem;
    font-size: 1.1rem;
}

.stat-content h5 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 0.25rem;
}

.stat-content p {
    font-size: 0.875rem;
    color: #6b7280;
    margin: 0;
}

.chatbot-demo-column {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-details h3 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 1.5rem;
}

.project-details p {
    font-size: 1.1rem;
    line-height: 1.7;
    color: #4b5563;
    margin-bottom: 2rem;
}

.tech-stack,
.project-features {
    margin-bottom: 2rem;
}

.tech-stack h4,
.project-features h4 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tech-stack h4 i,
.project-features h4 i {
    color: #2563eb;
}

.tech-stack ul,
.project-features ul {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}

.tech-stack li,
.project-features li {
    padding: 1rem 1.25rem;
    background: white;
    border-radius: 8px;
    border-left: 4px solid #2563eb;
    font-weight: 500;
    color: #374151;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.tech-stack li:hover,
.project-features li:hover {
    transform: translateX(4px);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.1);
}

.tech-stack li i,
.project-features li i {
    color: #2563eb;
    width: 16px;
    text-align: center;
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: #f9fafb;
    border-radius: 8px;
    transition: transform 0.3s ease;
}

.contact-item:hover {
    transform: translateY(-2px);
}

.contact-item i {
    font-size: 1.5rem;
    color: #2563eb;
    width: 40px;
    text-align: center;
}

.contact-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 0.25rem;
}

.contact-item p {
    color: #6b7280;
}

.contact-form {
    background: #f9fafb;
    padding: 2rem;
    border-radius: 12px;
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #2563eb;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Chatbot Styles */
.chatbot-demo {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e5e7eb;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    flex: 1;
}

.demo-header {
    margin-bottom: 2rem;
}

.demo-header h4 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.demo-header h4 i {
    color: #2563eb;
}

.demo-header p {
    color: #6b7280;
    font-size: 1rem;
    line-height: 1.6;
}

.chatbot-container {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    border: 1px solid #e5e7eb;
    flex: 1;
    display: flex;
    flex-direction: column;
    margin-bottom: 1.25rem;
    height: auto;
}

.chatbot-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    position: relative;
}

.chatbot-avatar {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.chatbot-info h5 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.status {
    font-size: 0.875rem;
    opacity: 0.9;
}

.status.online::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    margin-right: 0.5rem;
}

.chatbot-toggle {
    position: absolute;
    right: 1.5rem;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chatbot-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
}

.chatbot-window {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: #f8fafc;
    min-height: 0;
    height: auto;
    overflow: visible !important;
    max-height: none !important;
}

.chat-messages {
    flex: 1;
    padding: 1rem;
    gap: 0.75rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    overflow: visible !important;
    height: auto !important;
    max-height: none !important;
}

.message {
    display: flex;
    gap: 0.75rem;
    max-width: 85%;
}

.bot-message {
    align-self: flex-start;
}

.user-message {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message-avatar {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
}

.bot-message .message-avatar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.user-message .message-avatar {
    background: #e5e7eb;
    color: #374151;
}

.message-content {
    background: white;
    padding: 1rem 1.25rem;
    border-radius: 18px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    position: relative;
}

.bot-message .message-content {
    border-bottom-left-radius: 6px;
}

.user-message .message-content {
    background: #2563eb;
    color: white;
    border-bottom-right-radius: 6px;
}

.message-content p {
    margin: 0;
    line-height: 1.5;
    color: #374151;
}

.user-message .message-content p {
    color: white;
}

.message-time {
    font-size: 0.75rem;
    color: #9ca3af;
    margin-top: 0.5rem;
    display: block;
}

.user-message .message-time {
    color: rgba(255, 255, 255, 0.7);
}

.chat-input-container {
    padding: 1rem;
    background: white;
    border-top: 1px solid #e5e7eb;
}

.chat-input-wrapper {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

#chatInput {
    flex: 1;
    padding: 0.875rem 1rem;
    border: 2px solid #e5e7eb;
    border-radius: 25px;
    font-size: 0.95rem;
    transition: border-color 0.3s ease;
    background: #f9fafb;
}

#chatInput:focus {
    outline: none;
    border-color: #2563eb;
    background: white;
}

.send-button {
    width: 45px;
    height: 45px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.send-button:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.quick-replies {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.quick-reply {
    padding: 0.5rem 1rem;
    background: #f3f4f6;
    border: 1px solid #e5e7eb;
    border-radius: 20px;
    font-size: 0.875rem;
    color: #374151;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.quick-reply:hover {
    background: #2563eb;
    color: white;
    border-color: #2563eb;
    transform: translateY(-1px);
}

/* Chatbot animations */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message {
    animation: slideInUp 0.3s ease-out;
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    gap: 0.25rem;
    padding: 1rem 1.25rem;
    background: white;
    border-radius: 18px;
    border-bottom-left-radius: 6px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    align-self: flex-start;
    max-width: 85%;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background: #9ca3af;
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(1) { animation-delay: -0.32s; }
.typing-dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes typing {
    0%, 80%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Footer */
.footer {
    background: #1f2937;
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
    padding-bottom: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-stats {
        flex-direction: column;
        gap: 2rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .project-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .project-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .tech-stack ul,
    .project-features ul {
        grid-template-columns: 1fr;
    }

    .project-info {
        padding: 2rem;
    }

    .chatbot-demo {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .project-info {
        padding: 1.5rem;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: auto;
}

/* Loading animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section.active {
    animation: fadeInUp 0.6s ease-out;
}

/* Marketing section below chatbot */
.chatbot-marketing {
    margin-top: 0.5rem;
    padding: 1.25rem 1rem 0.5rem 1rem;
    background: #f4f8ff;
    border-radius: 12px;
    color: #374151;
    font-size: 1rem;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.04);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.chatbot-marketing strong {
    color: #2563eb;
}

.section:not(#home) {
    padding-top: 80px;
}

/* Adjust section-header margin-top for non-home sections */
.section:not(#home) .section-header {
    margin-top: 10px;
}