/* ============================================
   AI Quant Advisor - Modern CSS Stylesheet
   ============================================ */

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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

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

/* ============================================
   Navigation Bar
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--bg-white);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo span {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    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;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
}

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

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    transition: 0.3s;
    border-radius: 2px;
}

.hamburger.active .bar:nth-child(2) {
    opacity: 0;
}

.hamburger.active .bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.active .bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    margin-top: 80px;
    padding: 6rem 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::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(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    opacity: 0.95;
    animation: fadeInUp 1s ease;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    opacity: 0.9;
    animation: fadeInUp 1.2s ease;
}

.hero-tagline {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 2rem 0;
    color: var(--accent-color);
    animation: fadeInUp 1.4s ease;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background-color: var(--accent-color);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 1.6s ease;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 25px -5px rgba(245, 158, 11, 0.4);
    background-color: #d97706;
}

.cta-button.secondary {
    background-color: var(--primary-color);
}

.cta-button.secondary:hover {
    background-color: var(--primary-dark);
    box-shadow: 0 15px 25px -5px rgba(37, 99, 235, 0.4);
}

/* ============================================
   Features Section (Clickable Images)
   ============================================ */

.features-section {
    padding: 5rem 20px;
    background-color: var(--bg-light);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.image-card {
    cursor: pointer;
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s ease;
    box-shadow: var(--shadow);
}

.image-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

.image-placeholder {
    width: 100%;
    height: 300px;
    position: relative;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Different gradient backgrounds for each image */
.data-driven {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.accessibility {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.risk-management {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.personalized {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.transparency {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.community {
    background: linear-gradient(135deg, #30cfd0 0%, #330867 100%);
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    text-align: center;
    color: white;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.image-card:hover .image-overlay {
    opacity: 1;
}

.image-overlay h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.image-overlay p {
    font-size: 1rem;
    opacity: 0.9;
}

/* ============================================
   Solution Section
   ============================================ */

.solution-section {
    padding: 5rem 20px;
    background-color: var(--bg-white);
}

.solution-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.solution-card {
    padding: 2rem;
    background-color: var(--bg-light);
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

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

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

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

.cta-container {
    text-align: center;
    margin-top: 3rem;
}

/* ============================================
   Page Header (for About, Contact, Feedback)
   ============================================ */

.page-header {
    margin-top: 80px;
    padding: 4rem 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
}

.page-header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.page-subtitle {
    font-size: 1.25rem;
    opacity: 0.95;
}

/* ============================================
   About Page Styles
   ============================================ */

.about-section,
.goals-section,
.help-section {
    padding: 4rem 20px;
}

.about-section {
    background-color: var(--bg-white);
}

.goals-section {
    background-color: var(--bg-light);
}

.help-section {
    background-color: var(--bg-white);
}

.about-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--text-light);
}

.problem-list {
    list-style: none;
    margin: 2rem 0;
}

.problem-list li {
    padding: 1rem;
    margin-bottom: 1rem;
    background-color: var(--bg-light);
    border-left: 4px solid var(--primary-color);
    border-radius: 4px;
}

.problem-list li strong {
    color: var(--primary-color);
}

.goals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.goal-card {
    padding: 2rem;
    background-color: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s ease;
}

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

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

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

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

.help-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.help-card {
    padding: 2rem;
    background-color: var(--bg-light);
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

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

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

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

.help-card a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.help-card a:hover {
    text-decoration: underline;
}

/* ============================================
   Contact Page Styles
   ============================================ */

.contact-section {
    padding: 4rem 20px;
    background-color: var(--bg-light);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info h2 {
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
}

.contact-info > p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.info-item {
    padding: 1.5rem;
    background-color: var(--bg-white);
    border-radius: 8px;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}

.info-item h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.info-item p {
    color: var(--text-light);
}

.contact-form-container {
    background-color: var(--bg-white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.error-message {
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: none;
}

.error-message.show {
    display: block;
}

.submit-button {
    padding: 1rem 2rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.submit-button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.success-message,
.thank-you-message {
    background-color: #d1fae5;
    border: 2px solid var(--secondary-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    margin-top: 2rem;
}

.success-message h3,
.thank-you-message h3 {
    color: var(--secondary-color);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.success-message p,
.thank-you-message p {
    color: var(--text-dark);
    line-height: 1.8;
}

.thank-you-note {
    margin-top: 1rem;
    font-style: italic;
    color: var(--text-light);
}

/* ============================================
   Feedback Page Styles
   ============================================ */

.feedback-section {
    padding: 4rem 20px;
    background-color: var(--bg-light);
}

.feedback-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 1000px;
    margin: 0 auto;
}

.feedback-info h2 {
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
}

.feedback-info > p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.feedback-types {
    display: grid;
    gap: 1rem;
}

.type-item {
    padding: 1.5rem;
    background-color: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.type-item h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.type-item p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.feedback-form-container {
    background-color: var(--bg-white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.feedback-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* ============================================
   Animations
   ============================================ */

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

/* ============================================
   Responsive Design
   ============================================ */

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

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

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

    .nav-item {
        margin: 1rem 0;
    }

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

    .hero-subtitle,
    .hero-description {
        font-size: 1rem;
    }

    .hero-tagline {
        font-size: 1.25rem;
    }

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

    .image-grid {
        grid-template-columns: 1fr;
    }

    .contact-wrapper,
    .feedback-wrapper {
        grid-template-columns: 1fr;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .goals-grid,
    .help-content,
    .solution-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 4rem 20px;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .cta-button {
        padding: 0.875rem 2rem;
        font-size: 1rem;
    }

    .contact-form-container,
    .feedback-form-container {
        padding: 1.5rem;
    }
}