@import url("https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,700|Raleway:400,800,900");

:root {
    --text-color: #2c3e50;
    --light-gray: #f4f4f4;
    --border-color: #e0e0e0;
    --hover-color: #3498db;
    --orange-color: #d16004;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Source Sans Pro', Helvetica, sans-serif;
    background: var(--light-gray);
    color: var(--text-color);
    line-height: 1.6;
}

/* ============================================================
   HEADER
   ============================================================ */
#header {
    display: flex;
    justify-content: space-between;
    background-color: #ffffff;
    border-bottom: solid 1px rgba(160, 160, 160, 0.3);
    height: 3.5em;
    left: 0;
    line-height: 3.5em;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 10000;
}

#header a {
    color: inherit;
    text-decoration: none;
}

#header a:hover {
    border-bottom-color: transparent;
    color: var(--orange-color) !important;
}

#header h1 {
    font-family: "Raleway", Helvetica, sans-serif;
    font-size: 1.25em;
    font-weight: 800;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    height: inherit;
    line-height: inherit;
    padding: 0 0 0 1.5em;
    white-space: nowrap;
}

#header h1 a {
    font-size: 0.7em;
}

#header ul {
    list-style: none;
    margin: 0;
    padding-left: 0;
}

#header ul li {
    display: inline-block;
    padding-left: 0;
}

#header .links {
    flex: 1;
    border-left: solid 1px rgba(160, 160, 160, 0.3);
    height: inherit;
    line-height: inherit;
    margin-left: 1.5em;
    overflow: hidden;
    padding-left: 1.5em;
    position: relative;
}

#header .links ul li {
    border-left: solid 1px rgba(160, 160, 160, 0.3);
    line-height: 1;
    margin-top: 1.2em;
    padding-left: 20px;
}

#header .links ul li:first-child {
    border-left: 0;
    margin-left: 0;
    padding-left: 0;
}

#header .links ul li a {
    border-bottom: 0;
    font-family: "Raleway", Helvetica, sans-serif;
    font-size: 0.7em;
    font-weight: 400;
    letter-spacing: 0.25em;
    text-transform: uppercase;
}

/* ============================================================
   MOBILE MENU
   ============================================================ */
.menu-toggle, .close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 1001;
    cursor: pointer;
    display: none;
}

.menu-toggle {
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 22px;
}

.menu-toggle span {
    display: block;
    height: 4px;
    background: #272727;
    border-radius: 2px;
}

.menu-toggle.hidden {
    display: none;
}

.close-btn {
    font-size: 2rem;
    color: #272727;
}

.close-btn.active {
    display: block;
}

ul.menu {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: 20px;
}

/* ============================================================
   PROFILE SECTION
   ============================================================ */
.profile-section {
    text-align: center;
    padding: 7em 5vw 0 5vw;
    margin-bottom: 3em;
}

.hexagon-img-container {
    width: 200px;
    height: 200px;
    margin: 0 auto 1.5em;
    position: relative;
    filter: drop-shadow(0 10px 10px rgba(0,0,0,0.3));
}

.hexagon-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
}

/* Placeholder shown when no profile picture is provided */
.hexagon-placeholder {
    width: 100%;
    height: 100%;
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
    background: linear-gradient(135deg, #e8e8e8 0%, #d0d0d0 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: "Raleway", Helvetica, sans-serif;
    font-size: 3.5em;
    font-weight: 900;
    color: #aaa;
    letter-spacing: 0.05em;
}

.profile-name {
    font-size: 2em;
    font-weight: 900;
    letter-spacing: 0.05em;
    margin-bottom: 0.3em;
    font-family: "Raleway", Helvetica, sans-serif;
    line-height: 1.75;
    text-transform: uppercase;
    text-align: center;
}

.profile-title {
    font-size: 1.2em;
    color: var(--orange-color);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    text-align: center;
}

.profile-desc {
    font-size: 1em;
    letter-spacing: 0.04em;
    word-spacing: 0.08em;
    margin-top: 35px;
}

/* ============================================================
   SECTION HEADERS (shared)
   ============================================================ */
.section-name {
    width: 100%;
    margin: 2em 0;
    text-align: center;
    font-family: "Raleway", Helvetica, sans-serif;
    font-size: 1.5em;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    position: relative;
    display: block;
}

.section-name::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background-color: var(--orange-color);
}

/* ============================================================
   INTERESTS SECTION
   ============================================================ */
.interests-section {
    display: flex;
    justify-content: space-evenly;
    flex-wrap: wrap;
    margin-bottom: 50px;
    padding: 0 5vw 0 5vw;
}

.interest-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 10px;
    background: white;
    border: solid 1px rgba(160, 160, 160, 0.3);
    padding: 1.5em;
    width: 150px;
    flex: 1;
}

.interest-item h3 {
    text-align: center;
    font-size: 1em;
}

/* ============================================================
   TOOLS / TECH ARSENAL SECTION
   ============================================================ */
.tools-section {
    display: flex;
    justify-content: space-evenly;
    gap: 0.75em;
    flex-wrap: wrap;
    margin-bottom: 50px;
    padding: 0 30px 0 30px;
}

.tool-logo {
    height: 70px;
    filter: grayscale(100%);
    transition: all 0.3s ease;
}

.tool-logo:hover {
    filter: grayscale(0%);
    transform: scale(1.1);
}

/* ============================================================
   PROJECTS SECTION
   ============================================================ */
.projects-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
    text-align: center;
    margin-bottom: 50px;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    padding: 0 30px;
    width: 100%;
    max-width: 1200px;
}

.project-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
    cursor: pointer;
}

.project-card {
    background: white;
    border-radius: 1px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.project-card:hover .project-image {
    transform: scale(1.05);
}

.project-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-content {
    padding: 1.5em;
    text-align: left;
}

.project-title {
    font-size: 1.2em;
    font-weight: 900;
    margin-bottom: 0.5em;
    color: var(--text-color);
}

.project-description {
    color: #6c757d;
    font-size: 0.95em;
    margin-bottom: 1em;
}

/* Tags on project cards */
.project-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 1em;
}

.card-tag {
    background: var(--light-gray);
    border: solid 1px rgba(160, 160, 160, 0.3);
    padding: 0.2em 0.6em;
    font-size: 0.72em;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-color);
}

/* GitHub / demo links on card */
.project-card-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.card-action-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: var(--hover-color);
    text-decoration: none;
    font-size: 0.8em;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    transition: color 0.2s;
}

.card-action-link:hover {
    color: var(--orange-color);
}

/* ============================================================
   PUBLICATIONS SECTION
   ============================================================ */
.publications-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
    text-align: left;
    max-width: 1000px;
    margin: 3em auto;
    padding: 0 30px;
    width: 100%;
}

.publication-item {
    background: white;
    border: solid 1px rgba(160, 160, 160, 0.3);
    width: 100%;
    transition: box-shadow 0.3s ease;
    overflow: hidden;
}

.publication-item:hover {
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.publication-header {
    padding: 1.5em;
    cursor: pointer;
    position: relative;
    transition: background-color 0.3s ease;
}

.publication-header:hover {
    background-color: #fafafa;
}

.publication-title {
    font-size: 1.1em;
    font-weight: 700;
    margin-bottom: 0.5em;
    color: var(--text-color);
    line-height: 1.4;
    padding-right: 2em;
}

.publication-details {
    font-size: 0.9em;
    color: #6c757d;
    font-style: italic;
}

.expand-icon {
    position: absolute;
    right: 1.5em;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    transition: transform 0.3s ease;
}

.expand-icon::before {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--orange-color);
    border-bottom: 2px solid var(--orange-color);
    transform: rotate(45deg);
    top: -2px;
    left: 2px;
    transition: all 0.3s ease;
}

.publication-item.active .expand-icon {
    transform: translateY(-50%) rotate(180deg);
}

.publication-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background-color: #f9f9f9;
}

.publication-content.active {
    max-height: 600px;
    transition: max-height 0.5s ease-in;
}

.publication-inner {
    padding: 1.5em;
    border-top: solid 1px rgba(160, 160, 160, 0.2);
}

.publication-authors-list {
    font-size: 0.9em;
    color: var(--orange-color);
    font-style: italic;
    margin-bottom: 1em;
}

.publication-abstract {
    font-size: 0.95em;
    line-height: 1.6;
    margin-bottom: 1.2em;
    color: var(--text-color);
}

/* Tags on publication items */
.publication-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 1em;
}

.pub-tag {
    background: var(--light-gray);
    border: solid 1px rgba(160, 160, 160, 0.3);
    padding: 0.2em 0.6em;
    font-size: 0.72em;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-color);
}

/* Link buttons inside publication accordion */
.pub-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.publication-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5em;
    color: var(--hover-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9em;
    transition: color 0.3s ease;
}

.publication-link:hover {
    color: var(--orange-color);
}

.publication-link::after {
    content: '→';
    font-size: 1.1em;
    transition: transform 0.3s ease;
}

.publication-link:hover::after {
    transform: translateX(3px);
}

.publication-link.secondary {
    color: #6c757d;
}

.publication-link.secondary:hover {
    color: var(--orange-color);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
    display: flex;
    justify-content: center;
    padding: 20px;
    text-align: center;
    margin-top: 150px;
    border-top: solid 1px rgba(160, 160, 160, 0.3);
}

.footer a {
    color: #8f8f8f;
    text-decoration: none;
    font-size: 18px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: #555555;
}

.footer i {
    font-size: 24px;
    transition: transform 0.3s ease;
    margin: 10px;
}

.footer a:hover i {
    transform: scale(1.1);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media screen and (max-width: 768px) {
    .menu-toggle {
        display: flex;
        z-index: 1000;
    }

    #header .links ul li {
        border-left: none;
        align-items: center;
        margin-left: 0;
        padding-left: 0;
    }

    ul.menu {
        position: fixed;
        top: 0;
        left: 100%;
        width: 100%;
        height: 100vh;
        background-color: #ffffff;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: left 0.3s ease-in-out;
        z-index: 1000;
    }

    ul.menu.active {
        left: 0;
    }

    ul.menu li {
        margin: 20px 0;
    }

    .menu li a {
        font-size: 1.5rem;
    }

    .menu-toggle.hidden {
        display: none;
    }

    .publications-section {
        padding: 0 15px;
    }

    .publication-header {
        padding: 1.2em;
    }

    .publication-inner {
        padding: 1.2em;
    }

    .publication-title {
        font-size: 1em;
        padding-right: 2em;
    }

    .publication-details {
        font-size: 0.85em;
    }

    .expand-icon {
        right: 1.2em;
    }

    .project-grid {
        padding: 0 15px;
    }
}