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

:root {
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-secondary: #f9fafb;
    --border-color: #e5e7eb;
    --hover-color: #5a67d8;
    --footer-bg: #111827;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-secondary);
}

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

/* Header and Navigation */
header {
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
    transition: all 0.3s ease;
}

.navbar {
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: transform 0.3s ease;
}

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

.logo svg {
    color: var(--primary-color);
    transition: all 0.3s ease;
}

.logo:hover svg {
    transform: rotate(180deg);
}

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

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width 0.3s ease;
}

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

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

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    transition: all 0.3s ease;
    border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Social Icons */
.social-icons {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.social-icons a {
    color: var(--text-light);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    padding: 8px;
    border-radius: 50%;
}

.social-icons a:hover {
    color: var(--primary-color);
    background-color: rgba(102, 126, 234, 0.1);
    transform: translateY(-3px);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 8rem 0 6rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-overlay {
    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"><rect width="100" height="100" fill="none"/><circle cx="10" cy="10" r="1" fill="white" opacity="0.1"/><circle cx="50" cy="30" r="1" fill="white" opacity="0.1"/><circle cx="80" cy="60" r="1" fill="white" opacity="0.1"/><circle cx="30" cy="80" r="1" fill="white" opacity="0.1"/></svg>');
    opacity: 0.3;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

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

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.3);
    animation: fadeInDown 0.8s ease;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    letter-spacing: -1px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

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

.hero .subtitle {
    font-size: 1.5rem;
    opacity: 0.95;
    font-weight: 300;
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.cta-button {
    display: inline-block;
    background: white;
    color: var(--primary-color);
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    animation: fadeInUp 0.8s ease 0.6s both;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    background: rgba(255, 255, 255, 0.95);
}

.hero-decoration {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    overflow: hidden;
    line-height: 0;
}

.hero-decoration svg {
    position: relative;
    display: block;
    width: calc(100% + 1.3px);
    height: 60px;
}

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

.main-article {
    background-color: var(--bg-color);
    border-radius: 16px;
    padding: 3.5rem;
    box-shadow: var(--shadow-xl);
    max-width: 900px;
    margin: 0 auto;
    animation: fadeIn 0.8s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.intro-text {
    font-size: 1.125rem;
    margin-bottom: 3rem;
    color: #444;
    line-height: 1.9;
    padding: 2rem;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
}

.intro-text p {
    margin-bottom: 1.25em;
}

.intro-text p:last-child {
    margin-bottom: 0;
}

/* Expert Profiles */
.expert-profile {
    margin-bottom: 2.5rem;
    padding: 2rem;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-left: 4px solid var(--primary-color);
    border-radius: 12px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.expert-profile:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--secondary-color);
}

.expert-header {
    margin-bottom: 1.25rem;
}

.expert-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.expert-tagline {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1.05em;
    line-height: 1.5;
}

.contact-info {
    margin-bottom: 1rem;
    font-size: 0.92em;
    color: #666;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
}

.contact-info span {
    display: inline-block;
}

.label {
    font-weight: 600;
    color: #333;
}

.expertise-areas {
    margin: 1rem 0 1.5rem 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.expertise-tag {
    display: inline-block;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border: 1px solid rgba(102, 126, 234, 0.2);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.875em;
    color: var(--primary-dark);
    font-weight: 500;
    transition: all 0.3s ease;
}

.expertise-tag:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    transform: translateY(-2px);
}

.profile-text {
    color: #333;
    line-height: 1.8;
}

.profile-text p {
    margin-bottom: 1em;
}

.profile-text p:last-child {
    margin-bottom: 0;
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
}

a:hover {
    color: var(--primary-dark);
}

.profile-text a,
.intro-text a {
    border-bottom: 1px solid transparent;
}

.profile-text a:hover,
.intro-text a:hover {
    border-bottom-color: var(--primary-color);
}

/* About Section */
.about-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.03) 0%, rgba(118, 75, 162, 0.03) 100%);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    padding: 3.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
}

.about-content h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
}

.about-content h3 {
    font-size: 1.75rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
    font-weight: 700;
}

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

.about-text ul {
    margin: 1.5rem 0 1.5rem 2rem;
    line-height: 1.8;
}

.about-text li {
    margin-bottom: 0.75rem;
    position: relative;
    padding-left: 0.5rem;
}

.about-text li::before {
    content: '→';
    position: absolute;
    left: -1.5rem;
    color: var(--primary-color);
    font-weight: bold;
}

/* Contact Section */
.contact-section {
    padding: 5rem 0;
    background: var(--bg-secondary);
}

.contact-content {
    max-width: 700px;
    margin: 0 auto;
    background: white;
    padding: 3.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
}

.contact-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
    text-align: center;
}

.contact-intro {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 2.5rem;
    font-size: 1.125rem;
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

.form-group input,
.form-group textarea {
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
    background-color: var(--bg-secondary);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

.submit-button {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem 2.5rem;
    border: none;
    border-radius: 50px;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    margin-top: 1rem;
}

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

.submit-button:active {
    transform: translateY(0);
}

.submit-button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* Form Messages */
#form-messages {
    margin-bottom: 1.5rem;
}

.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    line-height: 1.5;
    animation: slideDown 0.3s ease;
}

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

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Footer */
footer {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #fff;
    padding: 3rem 0 1rem;
    border-top: 3px solid var(--primary-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.5rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: #fff;
    font-weight: 700;
}

.footer-section p {
    color: #cbd5e0;
    line-height: 1.7;
}

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

.footer-section ul li {
    margin-bottom: 0.625rem;
}

.footer-section ul li a {
    color: #cbd5e0;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
}

.footer-section ul li a:hover {
    color: #fff;
    transform: translateX(5px);
}

footer .social-icons {
    justify-content: flex-start;
}

footer .social-icons a {
    color: #cbd5e0;
    background: rgba(255, 255, 255, 0.05);
}

footer .social-icons a:hover {
    color: #fff;
    background: rgba(102, 126, 234, 0.3);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #cbd5e0;
}

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

    .navbar .container {
        flex-wrap: wrap;
    }

    .nav-menu {
        display: none;
        flex-direction: column;
        width: 100%;
        padding: 1rem 0;
        gap: 0.5rem;
        border-top: 1px solid var(--border-color);
        margin-top: 1rem;
    }

    .nav-menu.active {
        display: flex;
    }

    .social-icons {
        order: 3;
        width: 100%;
        justify-content: center;
        padding-top: 1rem;
        border-top: 1px solid var(--border-color);
    }

    .hero {
        padding: 5rem 0 4rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

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

    .main-article,
    .about-content,
    .contact-content {
        padding: 2rem 1.5rem;
    }

    .expert-profile {
        padding: 1.5rem;
    }

    .expert-title {
        font-size: 1.5rem;
    }

    .contact-info {
        flex-direction: column;
        gap: 0.5rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    footer .social-icons {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 4rem 0 3rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero .subtitle {
        font-size: 1.125rem;
    }

    .main-article,
    .about-content,
    .contact-content {
        padding: 1.5rem 1rem;
    }

    .expert-profile {
        padding: 1.25rem;
    }

    .about-content h2,
    .contact-content h2 {
        font-size: 2rem;
    }
}

/* Smooth Transitions */
* {
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Scroll to top animation */
@keyframes scrollTop {
    0% {
        opacity: 0;
        transform: translateY(100px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Print Styles */
@media print {
    header, footer, .social-icons, .cta-button {
        display: none;
    }

    .main-article, .about-content {
        box-shadow: none;
        padding: 0;
    }

    .expert-profile {
        page-break-inside: avoid;
    }
}

/* Accessibility */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Loading animation for images */
img {
    animation: fadeIn 0.5s ease;
}

/* Selection color */
::selection {
    background-color: var(--primary-color);
    color: white;
}

::-moz-selection {
    background-color: var(--primary-color);
    color: white;
}