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

:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --text-color: #2c3e50;
    --text-light: #7f8c8d;
    --bg-color: #f8f9fa;
    --white: #ffffff;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navbar - Professional & Elegant */
.navbar {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 1.25rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

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

.nav-brand h1 {
    color: var(--primary-color);
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.nav-menu a:hover::after {
    width: 100%;
}

.nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a.active::after {
    width: 100%;
}

/* Flash Messages */
.flash-messages {
    position: fixed;
    top: 90px;
    right: 24px;
    z-index: 1001;
}

.flash-message {
    padding: 1rem 1.5rem;
    margin-bottom: 0.75rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    animation: slideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
    min-width: 300px;
}

.flash-success {
    background: linear-gradient(135deg, var(--secondary-color), #27ae60);
    color: white;
}

.flash-error {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
}

@keyframes slideIn {
    from {
        transform: translateX(120%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Main Content */
main {
    flex: 1;
}

/* Hero Section - Elegant */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 6rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-section .container {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1.25rem;
    font-weight: 800;
    letter-spacing: -1px;
    animation: fadeInUp 0.8s ease;
    text-shadow: 0 2px 20px rgba(0,0,0,0.1);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    font-weight: 300;
    animation: fadeInUp 1s ease;
}

.hero-buttons {
    display: flex;
    gap: 1.25rem;
    justify-content: center;
    animation: fadeInUp 1.2s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Buttons - Professional */
.btn {
    padding: 1rem 2.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.3px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-primary:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.btn-block {
    width: 100%;
    text-align: center;
}

/* Features Section */
.features-section {
    padding: 5rem 0;
    background: var(--white);
}

.features-section h2 {
    text-align: center;
    font-size: 2.75rem;
    margin-bottom: 3.5rem;
    color: var(--text-color);
    font-weight: 700;
    letter-spacing: -0.5px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.05);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
    font-weight: 600;
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* Subscribe Section */
.subscribe-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    text-align: center;
    position: relative;
}

.subscribe-section h2 {
    font-size: 2.75rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.subscribe-section p {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    font-weight: 300;
}

.subscribe-form {
    display: flex;
    max-width: 550px;
    margin: 0 auto;
    gap: 1rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 0.5rem;
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
}

.subscribe-form input {
    flex: 1;
    padding: 1rem 1.25rem;
    border: none;
    border-radius: calc(var(--border-radius) - 4px);
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.95);
    color: var(--text-color);
}

.subscribe-form input:focus {
    outline: none;
    background: white;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

.subscribe-form button {
    padding: 1rem 2rem;
    border-radius: calc(var(--border-radius) - 4px);
}

.message {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: var(--border-radius);
    display: none;
    font-weight: 500;
}

.message.success {
    background: rgba(46, 204, 113, 0.2);
    color: white;
    display: block;
    border: 1px solid rgba(46, 204, 113, 0.3);
}

.message.error {
    background: rgba(231, 76, 60, 0.2);
    color: white;
    display: block;
    border: 1px solid rgba(231, 76, 60, 0.3);
}

/* Chatbot Section */
.chatbot-section {
    padding: 5rem 0;
    background: var(--bg-color);
}

.chatbot-section h2 {
    text-align: center;
    font-size: 2.75rem;
    margin-bottom: 3rem;
    color: var(--text-color);
    font-weight: 700;
}

.chatbot-container {
    max-width: 850px;
    margin: 0 auto;
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid rgba(0,0,0,0.05);
}

.chatbot-messages {
    height: 450px;
    overflow-y: auto;
    padding: 2rem;
    background: var(--white);
}

.chatbot-messages::-webkit-scrollbar {
    width: 8px;
}

.chatbot-messages::-webkit-scrollbar-track {
    background: var(--bg-color);
}

.chatbot-messages::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.chat-message {
    margin-bottom: 1.25rem;
    padding: 1.25rem 1.5rem;
    border-radius: var(--border-radius);
    max-width: 75%;
    animation: fadeIn 0.4s ease;
    line-height: 1.6;
}

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

.bot-message {
    background: linear-gradient(135deg, var(--primary-color), #2980b9);
    color: white;
    margin-right: auto;
    border-bottom-left-radius: 4px;
}

.user-message {
    background: linear-gradient(135deg, var(--secondary-color), #27ae60);
    color: white;
    margin-left: auto;
    border-bottom-right-radius: 4px;
}

.chatbot-input {
    display: flex;
    padding: 1.5rem;
    background: var(--bg-color);
    gap: 1rem;
    border-top: 1px solid rgba(0,0,0,0.05);
}

.chatbot-input input {
    flex: 1;
    padding: 1rem 1.25rem;
    border: 2px solid rgba(0,0,0,0.1);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: white;
}

.chatbot-input input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.chatbot-input button {
    padding: 1rem 2rem;
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.page-header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.page-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Content Section */
.content-section {
    padding: 4rem 0;
    background: var(--white);
}

/* About Page */
.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-intro,
.about-mission {
    margin-bottom: 4rem;
}

.about-content h2 {
    font-size: 2.25rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.about-content p {
    font-size: 1.1rem;
    color: var(--text-light);
    line-height: 1.9;
    margin-bottom: 1.5rem;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.value-card {
    background: var(--bg-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.05);
}

.value-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    border-color: var(--primary-color);
}

.value-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.value-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
    font-weight: 600;
}

.value-card p {
    color: var(--text-light);
    line-height: 1.8;
}

.features-list {
    margin-top: 2rem;
}

.feature-item {
    display: flex;
    gap: 1.5rem;
    padding: 2rem;
    background: var(--bg-color);
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.05);
}

.feature-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.feature-item h3 {
    color: var(--text-color);
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
}

.feature-item p {
    color: var(--text-light);
    margin: 0;
}

/* Privacy Page */
.privacy-content {
    max-width: 900px;
    margin: 0 auto;
}

.privacy-intro {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    margin-bottom: 3rem;
    border-left: 4px solid var(--primary-color);
}

.privacy-intro p {
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

.privacy-section {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.privacy-section:last-child {
    border-bottom: none;
}

.privacy-section h2 {
    font-size: 1.75rem;
    color: var(--text-color);
    margin-bottom: 1.25rem;
    font-weight: 700;
}

.privacy-section p {
    color: var(--text-light);
    line-height: 1.9;
    margin-bottom: 1rem;
}

.privacy-section ul {
    margin-left: 2rem;
    margin-top: 1rem;
}

.privacy-section li {
    color: var(--text-light);
    line-height: 1.9;
    margin-bottom: 0.75rem;
}

.privacy-section strong {
    color: var(--text-color);
    font-weight: 600;
}

/* Auth Pages */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 70vh;
    padding: 3rem 0;
    background: var(--bg-color);
}

.auth-card {
    background: var(--white);
    padding: 3.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 450px;
    border: 1px solid rgba(0,0,0,0.05);
}

.auth-card h2 {
    text-align: center;
    margin-bottom: 2.5rem;
    color: var(--primary-color);
    font-size: 2.25rem;
    font-weight: 700;
}

.form-group {
    margin-bottom: 1.75rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.75rem;
    color: var(--text-color);
    font-weight: 600;
    font-size: 0.95rem;
}

.form-group input {
    width: 100%;
    padding: 1rem 1.25rem;
    border: 2px solid rgba(0,0,0,0.1);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--bg-color);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.auth-link {
    text-align: center;
    margin-top: 2rem;
}

.auth-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.auth-link a:hover {
    text-decoration: underline;
}

/* Admin Panel */
.admin-container {
    padding: 3rem 0;
    background: var(--bg-color);
    min-height: 70vh;
}

.admin-container h1 {
    color: var(--text-color);
    margin-bottom: 2.5rem;
    font-size: 2.5rem;
    font-weight: 700;
}

.admin-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.05);
}

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

.stat-card h3 {
    color: var(--text-light);
    margin-bottom: 1rem;
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.admin-section {
    background: var(--white);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(0,0,0,0.05);
}

.admin-section h2 {
    color: var(--text-color);
    margin-bottom: 2rem;
    font-size: 2rem;
    font-weight: 700;
}

.admin-form {
    max-width: 650px;
}

.admin-form .form-group input[type="color"] {
    height: 60px;
    cursor: pointer;
    border-radius: var(--border-radius);
}

/* Footer - Professional */
footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 3rem 0 1.5rem;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    font-size: 1.25rem;
    margin-bottom: 1.25rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: white;
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        width: 100%;
    }
    
    .subscribe-form {
        flex-direction: column;
    }
    
    .nav-menu {
        gap: 1rem;
        font-size: 0.9rem;
    }
    
    .chat-message {
        max-width: 85%;
    }
    
    .page-header h1 {
        font-size: 2.25rem;
    }
    
    .features-section h2,
    .chatbot-section h2 {
        font-size: 2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}