:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --gradient-start: #3b82f6;
    --gradient-end: #8b5cf6;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --chat-user-bg: #3b82f6;
    --chat-assistant-bg: #f1f5f9;
    --input-bg: #ffffff;
    --input-border: #cbd5e1;
    --success-color: #10b981;
    --error-color: #ef4444;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
    --chat-user-bg: #3b82f6;
    --chat-assistant-bg: #334155;
    --input-bg: #334155;
    --input-border: #475569;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background 0.3s ease, color 0.3s ease;
}

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

.navbar {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

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

.nav-brand .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Orbitron', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-brand .logo i {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

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

.nav-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--gradient-start);
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
}

.nav-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-primary);
    font-size: 1.2rem;
}

.theme-toggle:hover {
    background: var(--gradient-start);
    color: white;
    transform: scale(1.05);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
}

.hero {
    padding: 4rem 0;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border-bottom: 1px solid var(--border-color);
}

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

.hero-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease;
}

.gradient-text {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

.hero-description a {
    color: var(--gradient-start);
    text-decoration: none;
    font-weight: 600;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.6s backwards;
}

.feature-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-card);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.feature-badge:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.feature-badge i {
    color: var(--gradient-start);
    font-size: 1.2rem;
}

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

.chat-section {
    padding: 3rem 0;
}

.chat-header {
    text-align: center;
    margin-bottom: 2rem;
}

.chat-header h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.chat-header i {
    color: var(--gradient-start);
}

.api-key-section {
    max-width: 600px;
    margin: 0 auto 2rem;
}

.api-key-input-group {
    display: flex;
    gap: 0.5rem;
}

.api-key-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 1rem;
}

.api-key-hint {
    display: block;
    margin-top: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.btn-secondary {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: var(--gradient-start);
    color: white;
    border-color: var(--gradient-start);
}

.btn-icon {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.btn-icon:hover {
    background: var(--gradient-start);
    color: white;
}

.chat-container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.chat-messages {
    height: 500px;
    overflow-y: auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.message {
    display: flex;
    gap: 1rem;
    animation: messageSlideIn 0.3s ease;
}

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

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.2rem;
}

.assistant-message .message-avatar {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
}

.user-message .message-avatar {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.message-content {
    background: var(--chat-assistant-bg);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    max-width: 70%;
    word-wrap: break-word;
}

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

.user-message .message-content {
    background: var(--chat-user-bg);
    color: white;
}

.chat-input-container {
    display: flex;
    gap: 0.5rem;
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.chat-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    resize: none;
    max-height: 150px;
}

.btn-send {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.btn-send:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.btn-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.page-section {
    padding: 3rem 0;
    min-height: calc(100vh - 200px);
}

.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.page-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

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

.about-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: white;
    margin-bottom: 1rem;
}

.about-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.value-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.value-item:hover {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(139, 92, 246, 0.2));
}

.value-item i {
    font-size: 1.5rem;
    color: var(--gradient-start);
}

.developer-card {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
}

.developer-info {
    display: flex;
    gap: 1.5rem;
    align-items: start;
}

.developer-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
    flex-shrink: 0;
}

.developer-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--gradient-start);
    margin: 0.5rem 0;
}

.btn-primary {
    display: inline-block;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    margin-top: 1rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.mission-statement {
    margin-top: 3rem;
    padding: 2rem;
    background: var(--bg-card);
    border-left: 4px solid var(--gradient-start);
    border-radius: 8px;
}

.mission-statement h2 {
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.contact-container {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
}

.contact-info {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    height: fit-content;
}

.contact-info h3 {
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.info-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.info-item i {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.info-item strong {
    display: block;
    margin-bottom: 0.25rem;
}

.info-item a {
    color: var(--gradient-start);
    text-decoration: none;
}

.contact-form-container {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.contact-form-container h3 {
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
}

.form-group textarea {
    resize: vertical;
}

.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    border: 1px solid var(--error-color);
}

.policy-content {
    max-width: 900px;
    margin: 0 auto;
}

.policy-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

.policy-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.policy-card h3 i {
    color: var(--gradient-start);
}

.policy-card ul {
    margin-left: 1.5rem;
    margin-top: 0.5rem;
}

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

.policy-footer {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
}

footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-info p {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.footer-info a {
    color: var(--gradient-start);
    text-decoration: none;
    font-weight: 500;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: all 0.3s ease;
    text-decoration: none;
}

.social-links a:hover {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    transform: translateY(-3px);
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--bg-card);
        width: 100%;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transition: left 0.3s ease;
        gap: 1rem;
    }

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

    .mobile-menu-toggle {
        display: block;
    }

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

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

    .contact-container {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .message-content {
        max-width: 85%;
    }

    .values-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .developer-info {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .hero-features {
        flex-direction: column;
        align-items: center;
    }

    .api-key-input-group {
        flex-wrap: wrap;
    }

    .api-key-input {
        width: 100%;
    }
}