/* ===================================
   CSS Reset & Base Styles
   =================================== */

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

:root {
    /* Winter color palette */
    --color-white: #ffffff;
    --color-light-gray: #f5f5f5;
    --color-text: #f0f0f0;
    --color-body-text: #f0eef8;
    --color-dark-overlay: rgba(0, 0, 0, 0.35);

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 3rem;
    --space-xl: 4rem;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    font-size: 1rem;
    line-height: 1.6;
    color: #f0f0f0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Custom Scrollbar
   =================================== */

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(186, 147, 216, 0.5) rgba(26, 26, 46, 0.8);
}

/* Chrome, Edge, and Safari */
*::-webkit-scrollbar {
    width: 10px;
}

*::-webkit-scrollbar-track {
    background: rgba(26, 26, 46, 0.8);
    border-radius: 10px;
}

*::-webkit-scrollbar-thumb {
    background: rgba(186, 147, 216, 0.5);
    border-radius: 10px;
    border: 2px solid rgba(26, 26, 46, 0.8);
    transition: background 0.3s ease;
}

*::-webkit-scrollbar-thumb:hover {
    background: rgba(186, 147, 216, 0.7);
}

*::-webkit-scrollbar-thumb:active {
    background: rgba(186, 147, 216, 0.9);
}

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

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md);
    background-color: transparent;
}

.nav-menu {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    list-style: none;
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 400;
    color: var(--color-white);
    text-decoration: none;
    position: relative;
    transition: opacity 0.3s ease;
    letter-spacing: 0.02em;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-white);
    transition: width 0.3s ease;
}

.nav-link:hover {
    opacity: 0.8;
}

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

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

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: url('winterbackground.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-dark-overlay);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: var(--space-md);
    max-width: 900px;
    margin: 0 auto;
}

.hero-quote {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 300;
    line-height: 1.6;
    color: var(--color-white);
    margin-bottom: var(--space-xl);
    opacity: 0;
    animation: fadeInUp 1.2s ease forwards;
    animation-delay: 0.3s;
}

.hero-quote cite {
    display: block;
    margin-top: var(--space-md);
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 400;
    font-style: normal;
    color: var(--color-text);
}

.hero-button {
    display: inline-block;
    padding: 0.875rem 2.5rem;
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-white);
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.4);
    background-color: transparent;
    transition: all 0.3s ease;
    letter-spacing: 0.05em;
    opacity: 0;
    animation: fadeInUp 1.2s ease forwards;
    animation-delay: 0.8s;
}

.hero-button:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.8);
    transform: translateY(-2px);
}

/* Snowflakes Animation */
.snowflake {
    position: absolute;
    top: -10px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 1em;
    pointer-events: none;
    z-index: 3;
    animation-name: snowfall;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
}

@keyframes snowfall {
    0% {
        transform: translateY(-10vh) rotate(0deg);
        opacity: 0.7;
    }
    100% {
        transform: translateY(110vh) rotate(360deg);
        opacity: 0.7;
    }
}

/* Individual snowflake variations */
.snowflake:nth-child(1) {
    left: 5%;
    animation-duration: 12s;
    animation-delay: -8s;
    font-size: 0.8em;
}

.snowflake:nth-child(2) {
    left: 15%;
    animation-duration: 15s;
    animation-delay: -3s;
    font-size: 1em;
}

.snowflake:nth-child(3) {
    left: 25%;
    animation-duration: 18s;
    animation-delay: -12s;
    font-size: 0.6em;
}

.snowflake:nth-child(4) {
    left: 35%;
    animation-duration: 14s;
    animation-delay: -6s;
    font-size: 0.9em;
}

.snowflake:nth-child(5) {
    left: 45%;
    animation-duration: 16s;
    animation-delay: -10s;
    font-size: 0.7em;
}

.snowflake:nth-child(6) {
    left: 55%;
    animation-duration: 13s;
    animation-delay: -4s;
    font-size: 0.85em;
}

.snowflake:nth-child(7) {
    left: 65%;
    animation-duration: 17s;
    animation-delay: -14s;
    font-size: 0.75em;
}

.snowflake:nth-child(8) {
    left: 75%;
    animation-duration: 19s;
    animation-delay: -7s;
    font-size: 0.65em;
}

.snowflake:nth-child(9) {
    left: 85%;
    animation-duration: 14s;
    animation-delay: -11s;
    font-size: 0.8em;
}

.snowflake:nth-child(10) {
    left: 95%;
    animation-duration: 16s;
    animation-delay: -5s;
    font-size: 0.7em;
}

/* ===================================
   Sections
   =================================== */

.section {
    min-height: 100vh;
    padding: var(--space-xl) var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #ffffff;
}

.section-alt {
    background-color: #f8f8f8;
}

.container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 300;
    margin-bottom: var(--space-md);
    color: #ffffff;
}

.section p {
    font-size: 1.125rem;
    color: #f0f0f0;
}

/* ===================================
   About Me Section
   =================================== */

#about {
    position: relative;
    padding: clamp(4rem, 10vh, 6rem) var(--space-md);
    background-image: url('winterbackground.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

#about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.35);
    z-index: 0;
}

#about .container {
    padding: var(--space-md) 0;
    position: relative;
    z-index: 1;
}

#about .section-title {
    color: #ffffff;
    letter-spacing: 0.02em;
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    margin-bottom: var(--space-lg);
    font-weight: 300;
}

.about-grid {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: clamp(2.5rem, 5vw, 4rem);
    align-items: center;
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.about-grid.visible {
    opacity: 1;
    transform: translateY(0);
}

.about-image-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--space-sm);
}

.about-image {
    width: 100%;
    max-width: 360px;
    height: auto;
    border-radius: 50%;
    object-fit: cover;
    aspect-ratio: 1 / 1;
    border: 3px solid rgba(186, 147, 216, 0.3);
    transition: all 0.3s ease;
}

.about-image:hover {
    border-color: rgba(186, 147, 216, 0.5);
    transform: scale(1.02);
}

.about-text-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    padding: var(--space-sm) 0;
}

.about-education {
    font-size: 1.25rem;
    font-weight: 600;
    color: #ffd4d8;
    margin-bottom: var(--space-xs);
    letter-spacing: 0.02em;
    line-height: 1.5;
}

.about-intro {
    font-size: 1.125rem;
    line-height: 1.85;
    color: var(--color-body-text);
    max-width: 72ch;
}

.about-hobbies {
    font-size: 1.125rem;
    line-height: 1.85;
    color: var(--color-body-text);
    max-width: 72ch;
    margin-top: var(--space-xs);
}

.about-hobbies strong {
    color: #ffffff;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.about-current {
    font-size: 1.125rem;
    line-height: 1.85;
    color: var(--color-body-text);
    font-style: italic;
    max-width: 72ch;
    padding-left: var(--space-md);
    padding-top: var(--space-xs);
    padding-bottom: var(--space-xs);
    border-left: 3px solid rgba(186, 147, 216, 0.4);
    margin-top: var(--space-xs);
    background: rgba(186, 147, 216, 0.05);
}

/* ===================================
   Skills Section
   =================================== */

#skills {
    min-height: 100vh;
    position: relative;
    padding: clamp(4rem, 10vh, 6rem) var(--space-md);
    background-image: url('winterbackground.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

#skills::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.35);
    z-index: 0;
}

#skills .container {
    padding: var(--space-md) 0;
    position: relative;
    z-index: 1;
}

#skills .section-title {
    color: #ffffff;
    text-align: center;
    margin-bottom: var(--space-xl);
    letter-spacing: 0.02em;
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 300;
}

/* Skills Accordion Container */
.skills-accordion-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    max-width: 900px;
    margin: 0 auto;
}

.skill-accordion-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    border: 1px solid rgba(186, 147, 216, 0.2);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(40px);
    overflow: hidden;
}

.skill-accordion-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.skill-accordion-card:hover {
    border-color: rgba(186, 147, 216, 0.4);
}

.skill-accordion-card.active {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(186, 147, 216, 0.5);
}

.skill-accordion-title {
    font-size: 1.5rem;
    font-weight: 500;
    color: #ffd4d8;
    letter-spacing: 0.01em;
    transition: color 0.3s ease;
}

.skill-accordion-card .accordion-header:hover .skill-accordion-title {
    color: #ffffff;
}

/* Skill Subsections */
.skill-subsection {
    margin-bottom: var(--space-md);
}

.skill-subsection:last-child {
    margin-bottom: 0;
}

.skill-subsection-title {
    font-size: 1.125rem;
    font-weight: 500;
    color: #ffffff;
    margin-bottom: var(--space-sm);
    letter-spacing: 0.01em;
    padding-left: var(--space-xs);
    border-left: 3px solid rgba(186, 147, 216, 0.4);
}

/* Skill List Styling */
.skill-accordion-card .skill-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
    padding-left: 0;
}

.skill-accordion-card .skill-list li {
    font-size: 0.9375rem;
    color: var(--color-body-text);
    padding-left: var(--space-md);
    position: relative;
    line-height: 1.7;
    transition: all 0.2s ease;
}

.skill-accordion-card .skill-list li:hover {
    color: #ffffff;
    padding-left: calc(var(--space-md) + 4px);
}

.skill-accordion-card .skill-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #ba93d8;
    font-size: 1.1rem;
    transition: all 0.2s ease;
}

.skill-accordion-card .skill-list li:hover::before {
    color: #dda6dc;
    transform: scale(1.2);
}

.skill-level {
    font-size: 0.875rem;
    color: #e8e6f0;
    font-style: italic;
}

/* ===================================
   Projects Section
   =================================== */

#projects {
    min-height: 100vh;
    position: relative;
    padding: clamp(4rem, 10vh, 6rem) var(--space-md);
    background-image: url('winterbackground.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

#projects::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.35);
    z-index: 0;
}

#projects .container {
    padding: var(--space-md) 0;
    position: relative;
    z-index: 1;
}

#projects .section-title {
    color: #ffffff;
    text-align: center;
    margin-bottom: var(--space-xl);
    letter-spacing: 0.02em;
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 300;
}

/* Projects Logo Grid */
.projects-logo-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
    max-width: 1100px;
    margin: 0 auto var(--space-xl) auto;
    padding: var(--space-lg) 0;
}

.project-logo-item {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.project-logo-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.project-logo-container {
    width: 100%;
    aspect-ratio: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(186, 147, 216, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    overflow: hidden;
}

.project-logo-container:hover {
    border-color: rgba(186, 147, 216, 0.5);
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-4px);
}

.project-logo-item.active .project-logo-container {
    border-color: rgba(186, 147, 216, 0.6);
    background: rgba(255, 255, 255, 0.1);
}

.project-logo-image {
    width: 80%;
    height: 80%;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.project-logo-container:hover .project-logo-image {
    transform: scale(1.1);
}

.project-logo-icon {
    width: 50%;
    height: 50%;
    color: rgba(186, 147, 216, 0.5);
    transition: all 0.3s ease;
}

.project-logo-container:hover .project-logo-icon {
    color: rgba(186, 147, 216, 0.7);
    transform: scale(1.15);
}

/* Project Details Panel */
.project-details-panel {
    max-width: 800px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(186, 147, 216, 0.3);
    border-radius: 12px;
    padding: var(--space-xl);
    position: relative;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: all 0.4s ease;
}

.project-details-panel.active {
    max-height: 600px;
    opacity: 1;
    margin-top: var(--space-xl);
}

.project-close-btn {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    background: transparent;
    border: none;
    color: #f2f0f8;
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    border-radius: 50%;
}

.project-close-btn:hover {
    background: rgba(186, 147, 216, 0.2);
    color: #ffffff;
    transform: rotate(90deg);
}

.project-details-content {
    display: none;
}

.project-details-content.active {
    display: block;
    animation: fadeInUp 0.5s ease forwards;
}

.project-details-title {
    font-size: 2rem;
    font-weight: 500;
    color: #ffd4d8;
    margin-bottom: var(--space-md);
    letter-spacing: 0.01em;
}

.project-details-description {
    font-size: 1.125rem;
    color: var(--color-body-text);
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

.project-details-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: 500;
    color: #ffffff;
    text-decoration: none;
    text-align: center;
    background: rgba(186, 147, 216, 0.25);
    border: 2px solid rgba(186, 147, 216, 0.5);
    border-radius: 8px;
    letter-spacing: 0.05em;
    transition: all 0.3s ease;
    margin-top: var(--space-md);
}

.project-details-button:hover {
    background: rgba(186, 147, 216, 0.35);
    border-color: rgba(186, 147, 216, 0.7);
    transform: translateY(-2px);
}

/* Project Tag in Details */
.project-details-content .project-tag {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: #ffd4d8;
    background: rgba(186, 147, 216, 0.15);
    border: 1px solid rgba(186, 147, 216, 0.3);
    border-radius: 6px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
}

/* ===================================
   Research Section
   =================================== */

#research {
    min-height: auto;
    position: relative;
    padding: clamp(4rem, 10vh, 6rem) var(--space-md);
    background-image: url('winterbackground.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

#research::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.35);
    z-index: 0;
}

#research .container {
    padding: var(--space-md) 0;
    position: relative;
    z-index: 1;
    max-width: 900px;
}

#research .section-title {
    color: #ffffff;
    text-align: center;
    margin-bottom: var(--space-xl);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 300;
    letter-spacing: 0.02em;
}

/* Research Interests */
.research-interests {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.interests-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: var(--space-lg);
    border: 1px solid rgba(186, 147, 216, 0.2);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(40px);
}

.interests-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.interests-card:hover {
    border-color: rgba(186, 147, 216, 0.4);
}

.interests-title {
    font-size: 1rem;
    font-weight: 600;
    color: #ffd4d8;
    margin-bottom: var(--space-sm);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.interests-list {
    font-size: 1.0625rem;
    color: var(--color-body-text);
    line-height: 1.7;
    font-weight: 400;
}

/* Research Block - For main positions */
.research-block {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: var(--space-lg);
    border: 1px solid rgba(186, 147, 216, 0.2);
    margin-bottom: var(--space-lg);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(40px);
}

.research-block.visible {
    opacity: 1;
    transform: translateY(0);
}

.research-block:hover {
    border-color: rgba(186, 147, 216, 0.4);
}

.research-header {
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid rgba(186, 147, 216, 0.2);
}

.research-position {
    font-size: 1.25rem;
    font-weight: 600;
    color: #ffd4d8;
    margin-bottom: var(--space-xs);
    line-height: 1.4;
}

.research-meta {
    font-size: 0.9375rem;
    color: #e8e6f0;
    font-style: italic;
    margin-bottom: 0.25rem;
    line-height: 1.5;
}

.research-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.research-subtitle {
    font-size: 1rem;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: var(--space-sm);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.research-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding-left: 0;
}

.research-list li {
    font-size: 0.9375rem;
    color: var(--color-body-text);
    position: relative;
    line-height: 1.7;
    padding-left: var(--space-md);
}

.research-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #ba93d8;
    font-weight: 500;
}

/* Section Headers - For dividing major sections */
.research-section-header {
    margin: var(--space-xl) 0 var(--space-lg) 0;
    text-align: center;
    position: relative;
}

.research-section-header h3 {
    font-size: 2rem;
    font-weight: 400;
    color: #ffffff;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    position: relative;
    display: inline-block;
    padding: 0 var(--space-md);
}

.research-section-header h3::before,
.research-section-header h3::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 60px;
    height: 1px;
    background: linear-gradient(to right, transparent, rgba(186, 147, 216, 0.4));
}

.research-section-header h3::before {
    right: 100%;
    margin-right: var(--space-sm);
}

.research-section-header h3::after {
    left: 100%;
    margin-left: var(--space-sm);
    background: linear-gradient(to left, transparent, rgba(186, 147, 216, 0.4));
}

/* Research Projects Grid */
.research-projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.research-project-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    border: 1px solid rgba(186, 147, 216, 0.2);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(40px);
    overflow: hidden;
}

.research-project-card.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Accordion Styles */
.accordion-card {
    display: flex;
    flex-direction: column;
}

.accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: var(--space-md) var(--space-lg);
    cursor: pointer;
    transition: all 0.3s ease;
    gap: var(--space-md);
}

.accordion-header:hover {
    background: rgba(255, 255, 255, 0.05);
}

.accordion-header:hover .project-title {
    color: #ffffff;
}

.accordion-title-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.accordion-icon {
    font-size: 1rem;
    color: #ba93d8;
    transition: transform 0.3s ease;
    flex-shrink: 0;
    padding-top: 0.25rem;
    user-select: none;
}

.accordion-card.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-card.active .accordion-header {
    background: rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(186, 147, 216, 0.2);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease, opacity 0.3s ease;
    opacity: 0;
    padding: 0 var(--space-lg);
}

.accordion-card.active .accordion-content {
    max-height: 1000px;
    opacity: 1;
    padding: var(--space-md) var(--space-lg) var(--space-lg) var(--space-lg);
}

.accordion-card:hover {
    border-color: rgba(186, 147, 216, 0.4);
}

.accordion-card.active {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(186, 147, 216, 0.5);
}

.project-title {
    font-size: 1.25rem;
    font-weight: 500;
    color: #ffd4d8;
    letter-spacing: 0.01em;
    line-height: 1.4;
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

.project-meta {
    font-size: 0.9375rem;
    color: #e8e6f0;
    font-style: italic;
    line-height: 1.5;
    margin-bottom: 0.25rem;
}

.project-subtitle {
    font-size: 1rem;
    font-weight: 500;
    color: #ffffff;
    margin-bottom: var(--space-sm);
    letter-spacing: 0.01em;
}

.project-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
    padding-left: 0;
}

.project-list li {
    font-size: 0.9375rem;
    color: var(--color-body-text);
    position: relative;
    line-height: 1.7;
    padding-left: var(--space-md);
    transition: all 0.2s ease;
}

.project-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #ba93d8;
    font-size: 1.1rem;
    transition: all 0.2s ease;
}

.project-list li:hover {
    color: #ffffff;
    padding-left: calc(var(--space-md) + 4px);
}

.project-list li:hover::before {
    color: #dda6dc;
    transform: scale(1.2);
}

/* COAP Projects Accordion */
.coap-projects-accordion .accordion-content {
    padding: 0;
}

.coap-projects-accordion.active .accordion-content {
    padding: var(--space-md) var(--space-lg) var(--space-lg) var(--space-lg);
}

.coap-project-item {
    padding: var(--space-md) 0;
}

.coap-project-item:first-child {
    padding-top: 0;
}

.coap-project-item:last-child {
    padding-bottom: 0;
}

.coap-project-divider {
    height: 1px;
    background: linear-gradient(to right, transparent, rgba(186, 147, 216, 0.3), transparent);
    margin: var(--space-lg) 0;
}

/* Publications */
.publication-entry {
    font-size: 1rem;
    color: var(--color-body-text);
    line-height: 1.85;
    padding: var(--space-sm);
    background: rgba(186, 147, 216, 0.05);
    border-radius: 4px;
    border-left: 3px solid rgba(186, 147, 216, 0.4);
}

.publication-entry em {
    color: #e8e6f0;
}

/* ===================================
   Socials Section
   =================================== */

#socials {
    min-height: 100vh;
    position: relative;
    padding: clamp(4rem, 10vh, 6rem) var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: url('winterbackground.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

#socials::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.35);
    z-index: 0;
}

#socials .container {
    padding: var(--space-md) 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    position: relative;
    z-index: 1;
}

#socials .section-title {
    color: #ffffff;
    text-align: center;
    margin-bottom: var(--space-lg);
    letter-spacing: 0.02em;
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 300;
}

/* Socials Grid - Two columns */
.socials-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(2rem, 5vw, 4rem);
    align-items: center;
    margin-bottom: var(--space-xl);
}

/* Social Icons - Left Side */
.socials-icons {
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: var(--space-lg);
    padding: var(--space-lg);
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.socials-icons.visible {
    opacity: 1;
    transform: translateY(0);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(186, 147, 216, 0.2);
    border-radius: 50%;
    text-decoration: none;
    color: var(--color-body-text);
    transition: all 0.3s ease;
    position: relative;
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(186, 147, 216, 0.5);
    transform: translateY(-4px);
}

.social-link:hover .social-icon {
    color: #ba93d8;
}

.social-icon {
    width: 2.5rem;
    height: 2.5rem;
    color: #f0eef8;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

/* Email Dropdown */
.email-dropdown {
    cursor: pointer;
}

.email-dropdown:focus {
    outline: 2px solid rgba(186, 147, 216, 0.6);
    outline-offset: 2px;
}

.email-dropdown-content {
    position: absolute;
    top: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%);
    background: rgba(26, 26, 46, 0.95);
    border: 1px solid rgba(186, 147, 216, 0.3);
    border-radius: 8px;
    padding: var(--space-sm);
    min-width: 280px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 10;
}

.email-dropdown:hover .email-dropdown-content,
.email-dropdown:focus .email-dropdown-content {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(4px);
}

.email-dropdown-content a {
    display: block;
    padding: var(--space-sm) var(--space-md);
    color: var(--color-body-text);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: all 0.2s ease;
    border-radius: 4px;
    letter-spacing: 0.01em;
}

.email-dropdown-content a:hover {
    background: rgba(186, 147, 216, 0.15);
    color: #ffffff;
    padding-left: calc(var(--space-md) + 4px);
}

/* Blog Announcement - Right Side */
.blog-announcement {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    padding: var(--space-xl);
    background: rgba(186, 147, 216, 0.1);
    border: 2px solid rgba(186, 147, 216, 0.3);
    border-radius: 8px;
    text-align: center;
    min-height: 300px;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.blog-announcement.visible {
    opacity: 1;
    transform: translateY(0);
}

.blog-text {
    font-size: 1.375rem;
    font-weight: 400;
    color: #ffffff;
    line-height: 1.7;
    max-width: 28ch;
    letter-spacing: 0.01em;
}

.blog-button {
    display: inline-block;
    padding: 1rem 3rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: #ffffff;
    text-decoration: none;
    background: rgba(186, 147, 216, 0.2);
    border: 2px solid rgba(186, 147, 216, 0.5);
    border-radius: 8px;
    letter-spacing: 0.1em;
    transition: all 0.3s ease;
}

.blog-button:hover {
    background: rgba(186, 147, 216, 0.35);
    border-color: rgba(186, 147, 216, 0.7);
    transform: translateY(-2px);
}


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

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

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

@media (max-width: 768px) {
    .nav {
        padding: var(--space-sm);
    }

    .nav-menu {
        gap: var(--space-sm);
        flex-wrap: wrap;
    }

    .nav-link {
        font-size: 0.875rem;
    }

    .hero-quote {
        font-size: clamp(1.25rem, 5vw, 1.75rem);
    }

    .hero-button {
        padding: 0.75rem 2rem;
        font-size: 0.9375rem;
    }

    .section {
        padding: var(--space-lg) var(--space-sm);
    }

    /* About Me responsive */
    #about {
        padding: var(--space-xl) var(--space-md);
    }

    #about .container {
        padding: var(--space-md) 0;
    }

    #about .section-title {
        margin-bottom: var(--space-lg);
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
        align-items: center;
    }

    .about-image-container {
        padding: 0;
    }

    .about-image {
        max-width: 280px;
    }

    .about-text-container {
        padding: 0;
        gap: var(--space-md);
    }

    .about-education {
        font-size: 1.125rem;
    }

    .about-intro,
    .about-hobbies,
    .about-current {
        font-size: 1.0625rem;
        line-height: 1.85;
    }

    .about-current {
        padding-left: var(--space-md);
    }

    /* Projects responsive */
    #projects {
        min-height: auto;
        padding: var(--space-xl) var(--space-md);
    }

    #projects .container {
        padding: var(--space-md) 0;
    }

    #projects .section-title {
        margin-bottom: var(--space-lg);
    }

    .projects-logo-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
        padding: var(--space-md) 0;
    }

    .project-logo-icon {
        width: 45%;
        height: 45%;
    }

    .project-details-panel {
        padding: var(--space-lg);
    }

    .project-details-title {
        font-size: 1.5rem;
    }

    .project-details-description {
        font-size: 1rem;
    }

    .project-details-button {
        padding: 0.875rem 2rem;
        font-size: 0.9375rem;
    }

    /* Skills responsive */
    #skills {
        padding: var(--space-xl) var(--space-md);
    }

    #skills .container {
        padding: var(--space-md) 0;
    }

    #skills .section-title {
        margin-bottom: var(--space-lg);
    }

    .skills-accordion-container {
        gap: var(--space-md);
    }

    .skill-accordion-card .accordion-header {
        padding: var(--space-md);
    }

    .skill-accordion-card.active .accordion-content {
        padding: var(--space-md);
    }

    .skill-accordion-title {
        font-size: 1.25rem;
    }

    .skill-subsection-title {
        font-size: 1rem;
    }

    /* Research responsive */
    #research {
        min-height: auto;
        padding: var(--space-xl) var(--space-md);
    }

    #research .container {
        padding: var(--space-md) 0;
    }

    #research .section-title {
        margin-bottom: var(--space-lg);
    }

    .research-interests {
        grid-template-columns: 1fr;
        gap: var(--space-md);
        margin-bottom: var(--space-lg);
    }

    .interests-card {
        padding: var(--space-md);
    }

    .interests-title {
        font-size: 0.9375rem;
    }

    .interests-list {
        font-size: 1rem;
    }

    .research-block {
        padding: var(--space-md);
        margin-bottom: var(--space-md);
    }

    .research-position {
        font-size: 1.125rem;
    }

    .research-meta {
        font-size: 0.875rem;
    }

    .research-list li,
    .project-list li {
        font-size: 0.9375rem;
        line-height: 1.7;
    }

    .research-section-header {
        margin: var(--space-lg) 0 var(--space-md) 0;
    }

    .research-section-header h3 {
        font-size: 1.5rem;
    }

    .research-section-header h3::before,
    .research-section-header h3::after {
        width: 40px;
    }

    .research-projects-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .accordion-header {
        padding: var(--space-md);
    }

    .accordion-card.active .accordion-content {
        padding: var(--space-md);
    }

    .coap-projects-accordion.active .accordion-content {
        padding: var(--space-md);
    }

    .project-title {
        font-size: 1.125rem;
    }

    .accordion-icon {
        font-size: 0.875rem;
    }

    /* Socials responsive */
    #socials {
        min-height: auto;
        padding: var(--space-xl) var(--space-md);
    }

    #socials .container {
        gap: var(--space-lg);
    }

    #socials .section-title {
        margin-bottom: var(--space-md);
    }

    .socials-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
        margin-bottom: 0;
    }

    .socials-icons {
        padding: 0;
        gap: var(--space-md);
        flex-wrap: wrap;
    }

    .social-link {
        width: 70px;
        height: 70px;
    }

    .social-icon {
        width: 2rem;
        height: 2rem;
    }

    .email-dropdown-content {
        min-width: 240px;
    }

    .blog-announcement {
        padding: var(--space-lg);
        min-height: auto;
    }

    .blog-text {
        font-size: 1.25rem;
        max-width: 100%;
    }

    .blog-button {
        padding: 0.875rem 2.5rem;
        font-size: 1.125rem;
    }
}

@media (max-width: 480px) {
    .nav-menu {
        gap: var(--space-xs);
    }

    .nav-link {
        font-size: 0.8125rem;
    }

    .hero {
        background-attachment: scroll;
    }
}

/* ===================================
   Accessibility
   =================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Focus states for keyboard navigation */
a:focus-visible,
button:focus-visible,
.accordion-header:focus-visible {
    outline: 2px solid rgba(186, 147, 216, 0.6);
    outline-offset: 2px;
    border-radius: 4px;
}