/* ===== RESET & BASE STYLES ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-main);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ===== VARIABLES ===== */
:root {
    /* Color Palette */
    --turquoise-surf: #06aed5;
    --cerulean: #086788;
    --bright-amber: #f0c808;
    --papaya-whip: #fff1d0;
    --primary-scarlet: #dd1c1a;

    /* Light Theme Colors */
    --primary-color: var(--cerulean);
    --secondary-color: var(--turquoise-surf);
    --accent-color: var(--turquoise-surf);
    --accent-hover: var(--cerulean);
    --warning-color: var(--bright-amber);
    --error-color: var(--primary-scarlet);
    --text-light: #6c7983;
    --text-dark: var(--cerulean);
    --bg-light: #f8f4e6;
    --bg-main: var(--papaya-whip);
    --border-light: #e2d3b7;
    --card-bg: #ffffff;

    /* Layout & Effects */
    --max-width: 1200px;
    --section-padding: 4rem 0;
    --container-padding: 0 2rem;
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(8, 103, 136, 0.08);
    --box-shadow-hover: 0 8px 25px rgba(8, 103, 136, 0.15);
    --transition: all 0.3s ease;
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --primary-color: var(--bright-amber);
    --secondary-color: var(--turquoise-surf);
    --accent-color: var(--bright-amber);
    --accent-hover: var(--turquoise-surf);
    --warning-color: var(--primary-scarlet);
    --error-color: var(--primary-scarlet);
    --text-light: var(--papaya-whip);
    --text-dark: var(--papaya-whip);
    --bg-light: #0a537a;
    --bg-main: var(--cerulean);
    --border-light: var(--turquoise-surf);
    --card-bg: #0a4d6e;
    --box-shadow: 0 4px 12px rgba(6, 174, 213, 0.2);
    --box-shadow-hover: 0 8px 25px rgba(6, 174, 213, 0.3);
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1.5rem;
    color: var(--text-dark);
    font-size: 1.1rem;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--accent-hover);
}

/* ===== LAYOUT ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--container-padding);
}

.section {
    padding: var(--section-padding);
}

/* ===== HEADER & NAVIGATION ===== */
.header {
    background: var(--bg-main);
    box-shadow: var(--box-shadow);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 1px solid var(--border-light);
}

.nav {
    padding: 1rem 0;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo-link {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    text-decoration: none;
}

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

.nav-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    color: var(--text-dark);
    font-weight: 500;
    font-size: 1rem;
    padding: 0.5rem 0;
    position: relative;
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-color);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 3px;
}

.nav-toggle-line {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: var(--transition);
}

/* ===== DARK MODE TOGGLE ===== */
.theme-toggle {
    background: var(--bg-light);
    border: 1px solid var(--border-light);
    border-radius: 25px;
    padding: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
}

.theme-toggle:hover {
    background: var(--accent-color);
    color: var(--bg-main);
    border-color: var(--accent-color);
    transform: scale(1.05);
}

.theme-toggle i {
    font-size: 1.1rem;
    transition: var(--transition);
}

/* Hide/show icons based on theme */
[data-theme="light"] .theme-toggle .fa-moon {
    display: inline;
}

[data-theme="light"] .theme-toggle .fa-sun {
    display: none;
}

[data-theme="dark"] .theme-toggle .fa-moon {
    display: none;
}

[data-theme="dark"] .theme-toggle .fa-sun {
    display: inline;
}

/* ===== MAIN CONTENT ===== */
.main {
    margin-top: 80px; /* Account for fixed header */
    min-height: calc(100vh - 140px);
}

/* ===== HERO SECTION ===== */
.hero {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--bg-main) 0%, var(--bg-light) 100%);
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--container-padding);
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 3rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    font-weight: 400;
}

.hero-description {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 2rem;
}

.hero-image {
    display: flex;
    justify-content: center;
}

.profile-image {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: var(--box-shadow);
    border: 4px solid var(--accent-color);
    transition: var(--transition);
}

.profile-image:hover {
    box-shadow: var(--box-shadow-hover);
    transform: scale(1.02);
}

/* ===== PROFESSIONAL LINKS ===== */
.professional-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 2rem;
}

.professional-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--card-bg);
    border: 2px solid var(--border-light);
    border-radius: var(--border-radius);
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
    text-decoration: none;
}

.professional-link:hover {
    background: var(--accent-color);
    color: var(--bg-main);
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-hover);
}

/* ===== PAGE CONTENT ===== */
.page-header {
    background: var(--bg-light);
    padding: 2rem 0;
    margin-top: -80px;
    padding-top: calc(80px + 2rem);
}

.page-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 0;
}

.page-content {
    padding: 3rem 0;
}

.content-section {
    margin-bottom: 3rem;
}

.content-section:last-child {
    margin-bottom: 0;
}

/* ===== BLOG STYLES ===== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.blog-post-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.blog-post-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--box-shadow-hover);
    border-color: var(--accent-color);
}

.blog-post-content {
    padding: 1.5rem;
}

.blog-post-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.blog-post-date {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.blog-post-excerpt {
    color: var(--text-dark);
    font-size: 1rem;
    margin-bottom: 0;
}

/* ===== RESUME STYLES ===== */
.resume-section {
    margin-bottom: 3rem;
}

.resume-item {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-light);
}

.resume-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.resume-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.resume-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.resume-company {
    color: var(--accent-color);
    font-weight: 500;
}

.resume-date {
    color: var(--text-light);
    font-size: 0.9rem;
    white-space: nowrap;
}

.resume-description ul {
    list-style-type: disc;
    margin-left: 1.5rem;
}

.resume-description li {
    margin-bottom: 0.5rem;
}

/* ===== RESEARCH STYLES ===== */
.research-grid {
    display: grid;
    gap: 2rem;
    margin-top: 2rem;
}

.research-item {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.research-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-hover);
    border-color: var(--accent-color);
}

.research-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.research-authors {
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 0.5rem;
}

.research-venue {
    color: var(--accent-color);
    font-weight: 500;
    margin-bottom: 1rem;
}

.research-description {
    margin-bottom: 1rem;
}

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

.research-link {
    padding: 0.5rem 1rem;
    background: var(--bg-light);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.research-link:hover {
    background: var(--accent-color);
    color: var(--bg-main);
    transform: translateY(-1px);
}

/* ===== FOOTER ===== */
.footer {
    background: var(--bg-light);
    padding: 2rem 0;
    margin-top: 4rem;
    border-top: 1px solid var(--border-light);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--container-padding);
}

.footer-content {
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.footer-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--card-bg);
    color: var(--text-dark);
    border-radius: 50%;
    font-size: 1.1rem;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-light);
}

.footer-link:hover {
    background: var(--accent-color);
    color: var(--bg-main);
    transform: translateY(-2px);
    border-color: var(--accent-color);
}

.footer-text {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    :root {
        --container-padding: 0 1rem;
        --section-padding: 2rem 0;
    }

    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--bg-main);
        flex-direction: column;
        gap: 0;
        padding: 2rem;
        box-shadow: var(--box-shadow);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
        border-top: 1px solid var(--border-light);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-item {
        width: 100%;
        text-align: center;
        padding: 1rem 0;
        border-bottom: 1px solid var(--border-light);
    }

    .nav-item:last-child {
        border-bottom: none;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-controls {
        gap: 1rem;
    }

    .theme-toggle {
        width: 40px;
        height: 40px;
    }

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

    .nav-toggle.active .nav-toggle-line:nth-child(2) {
        opacity: 0;
    }

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

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

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

    .professional-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .resume-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .resume-date {
        margin-top: 0.5rem;
    }

    .research-links {
        justify-content: center;
    }

    .footer-links {
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .profile-image {
        width: 200px;
        height: 200px;
    }

    .professional-link {
        padding: 0.625rem 1.25rem;
        font-size: 0.9rem;
    }

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

/* ===== UTILITY CLASSES ===== */
.text-center {
    text-align: center;
}

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

.mb-0 {
    margin-bottom: 0;
}

.mb-1 {
    margin-bottom: 1rem;
}

.mb-2 {
    margin-bottom: 2rem;
}

.mt-2 {
    margin-top: 2rem;
}

.hidden {
    display: none;
}

/* ===== DARK MODE SPECIFIC ENHANCEMENTS ===== */
[data-theme="dark"] .hero {
    background: linear-gradient(135deg, var(--bg-main) 0%, var(--bg-light) 50%, var(--bg-main) 100%);
}

[data-theme="dark"] .profile-image {
    border-color: var(--bright-amber);
    box-shadow: 0 8px 25px rgba(240, 200, 8, 0.3);
}

[data-theme="dark"] .professional-link:hover,
[data-theme="dark"] .research-link:hover,
[data-theme="dark"] .footer-link:hover {
    color: var(--cerulean);
    background: var(--bright-amber);
}

[data-theme="dark"] .nav-link:hover,
[data-theme="dark"] .nav-link.active {
    color: var(--bright-amber);
}

[data-theme="dark"] .nav-link.active::after {
    background: var(--bright-amber);
}

[data-theme="dark"] .blog-post-card:hover,
[data-theme="dark"] .research-item:hover {
    border-color: var(--bright-amber);
}

/* Light theme specific enhancements */
[data-theme="light"] .hero {
    background: linear-gradient(135deg, var(--papaya-whip) 0%, var(--bg-light) 50%, var(--papaya-whip) 100%);
}

[data-theme="light"] .profile-image {
    border-color: var(--turquoise-surf);
    box-shadow: 0 8px 25px rgba(6, 174, 213, 0.2);
}

/* Smooth theme transition for all elements */
*,
*::before,
*::after {
    transition:
        background-color 0.3s ease,
        border-color 0.3s ease,
        box-shadow 0.3s ease,
        color 0.3s ease;
}

/* Ensure icons and images transition smoothly */
i, img, svg {
    transition: var(--transition);
}

/* Add subtle accent to active nav links */
.nav-link.active {
    position: relative;
}

.nav-link.active::before {
    content: '';
    position: absolute;
    left: -8px;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--accent-color);
    border-radius: 2px;
    opacity: 0;
    animation: slideIn 0.3s ease forwards;
}

@keyframes slideIn {
    to {
        opacity: 1;
    }
}

/* Enhanced focus states for accessibility */
.theme-toggle:focus,
.nav-link:focus,
.professional-link:focus,
.research-link:focus,
.footer-link:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Improve contrast for better readability */
[data-theme="dark"] .hero-subtitle {
    color: var(--secondary-color);
}

[data-theme="dark"] .blog-post-date,
[data-theme="dark"] .research-authors,
[data-theme="dark"] .resume-date {
    color: var(--secondary-color);
}

/* Additional color enhancements */
.page-header {
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-main) 100%);
    border-bottom: 2px solid var(--accent-color);
}

[data-theme="dark"] .page-header {
    border-bottom: 2px solid var(--bright-amber);
}

/* Button and link enhancements */
.professional-link,
.research-link {
    background: linear-gradient(135deg, var(--card-bg) 0%, var(--bg-light) 100%);
    border: 2px solid var(--accent-color);
}

[data-theme="dark"] .professional-link,
[data-theme="dark"] .research-link {
    background: linear-gradient(135deg, var(--card-bg) 0%, var(--bg-light) 100%);
    border: 2px solid var(--turquoise-surf);
}

/* Navigation enhancements */
.nav-logo-link:hover {
    color: var(--accent-color);
}

[data-theme="dark"] .nav-logo-link:hover {
    color: var(--bright-amber);
}

/* Category tags styling */
.category-tag {
    background: var(--accent-color);
    color: var(--bg-main);
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    font-weight: 500;
    margin: 0 0.25rem;
    display: inline-block;
}

[data-theme="dark"] .category-tag {
    background: var(--bright-amber);
    color: var(--cerulean);
}

/* ===== COLOR UTILITY CLASSES ===== */
/* Use these classes to add emphasis colors to your content */

/* Text Colors */
.text-turquoise { color: var(--turquoise-surf) !important; }
.text-cerulean { color: var(--cerulean) !important; }
.text-amber { color: var(--bright-amber) !important; }
.text-papaya { color: var(--papaya-whip) !important; }
.text-scarlet { color: var(--primary-scarlet) !important; }

/* Background Colors */
.bg-turquoise {
    background-color: var(--turquoise-surf) !important;
    color: var(--papaya-whip) !important;
}
.bg-cerulean {
    background-color: var(--cerulean) !important;
    color: var(--papaya-whip) !important;
}
.bg-amber {
    background-color: var(--bright-amber) !important;
    color: var(--cerulean) !important;
}
.bg-papaya {
    background-color: var(--papaya-whip) !important;
    color: var(--cerulean) !important;
}
.bg-scarlet {
    background-color: var(--primary-scarlet) !important;
    color: var(--papaya-whip) !important;
}

/* Emphasis Boxes */
.emphasis-box {
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    margin: 1rem 0;
    border-left: 4px solid;
}

.emphasis-turquoise {
    background: rgba(6, 174, 213, 0.1);
    border-left-color: var(--turquoise-surf);
    color: var(--cerulean);
}

.emphasis-amber {
    background: rgba(240, 200, 8, 0.1);
    border-left-color: var(--bright-amber);
    color: var(--cerulean);
}

.emphasis-scarlet {
    background: rgba(221, 28, 26, 0.1);
    border-left-color: var(--primary-scarlet);
    color: var(--primary-scarlet);
}

/* Dark theme adjustments */
[data-theme="dark"] .emphasis-turquoise {
    background: rgba(6, 174, 213, 0.2);
    color: var(--turquoise-surf);
}

[data-theme="dark"] .emphasis-amber {
    background: rgba(240, 200, 8, 0.2);
    color: var(--bright-amber);
}

[data-theme="dark"] .emphasis-scarlet {
    background: rgba(221, 28, 26, 0.2);
    color: var(--primary-scarlet);
}

/* Highlight spans */
.highlight {
    padding: 0.1em 0.3em;
    border-radius: 3px;
    font-weight: 500;
}

.highlight-turquoise {
    background: var(--turquoise-surf);
    color: var(--papaya-whip);
}

.highlight-amber {
    background: var(--bright-amber);
    color: var(--cerulean);
}

.highlight-scarlet {
    background: var(--primary-scarlet);
    color: var(--papaya-whip);
}

/* ===== SPECIAL DISCLAIMER BANNER ===== */
.disclaimer-banner {
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.1rem;
    font-weight: 500;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.disclaimer-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.disclaimer-banner:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(221, 28, 26, 0.3);
    animation: pulse 2s infinite;
}

.disclaimer-banner:hover::before {
    left: 100%;
}

@keyframes pulse {
    0% { box-shadow: 0 8px 25px rgba(221, 28, 26, 0.3); }
    50% { box-shadow: 0 12px 30px rgba(221, 28, 26, 0.5); }
    100% { box-shadow: 0 8px 25px rgba(221, 28, 26, 0.3); }
}