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

:root {
    --body-bg-color: grey;
    --bg-color: #121212;
    --bg-color-1: rgba(0, 0, 0, 0.1);
    --bg-color-2: rgba(0, 0, 0, 0.2);
    --bg-color-3: rgba(0, 0, 0, 0.3);
    --bg-color-7: rgba(0, 0, 0, 0.7);
    --bg-color-8: rgba(0, 0, 0, 0.8);
    --bg-text-color-8: rgba(245, 245, 245, 0.85);
    --text-color: #ffffff;
    --btn-bg: #333333;
    --btn-text: #fff;
    --nav-underline-color: #ff004f;
    --download-btn-bg: #ff004f;
    --download-hover-btn-bg: #f894b3;
    --text-shadow-color: #ababab;
    --hover-color: grey;
    --header-bg-image: url(assets/images/dark-background.jpeg);
}

body {
    background-color: var(--body-bg-color);
    transition: background-color 0.3s;
}

body.light-theme {
    --body-bg-color: white;
    --bg-color: #ffffff;
    --bg-color-1: rgba(245, 245, 245, 0.9);
    --bg-color-2: rgba(245, 245, 245, 0.8);
    --bg-color-3: rgba(245, 245, 245, 0.7);
    --bg-color-7: rgba(245, 245, 245, 0.3);
    --bg-color-8: #eee;
    --bg-text-color-8: #333333;
    --text-color: #000000;
    --text-shadow-color: #d5d5d5;
    --hover-color: #d5d5d5;
    --btn-bg: #ffffff;
    --btn-text: #000;
    --header-bg-image: url(assets/images/light-background.jpeg);
}


/* ---------- Common ---------- */
.sub-title {
    font-size: 60px;
    color: var(--text-color);
    font-weight: 600;
    margin: 40px 0 20px 40px;
}

.margin-top-30 {
    margin-top: 30px;
}

.white-icons {
    color: var(--text-color);
    margin-right: 10px;
}

.btn {
    display: block;
    width: fit-content;
    border-radius: 6px;
    margin: 30px 0;
    text-decoration: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 10px 20px;
    font-size: 16px;
    border: 1px transparent;
    transition: background 1s;
}

.goToTopBtn {
    background-color: var(--download-btn-bg);
    border: none;
    border-radius: 30%;
    font-size: 20px;
    color: var(--btn-text);
    display: none;
    position: fixed;
    bottom: 20px;
    right: 30px;
    z-index: 9;
}

/* --------- Navigation --------- */

.navigation {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: transparent;
    background-color: var(--bg-color);
    opacity: 0.8;
    z-index: 99;
    padding: 0 2rem;
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
}

nav ul li {
    display: inline-block;
    list-style: none;
    margin: 10px;
}

.nav-item, .nav-item-right {
    color: var(--text-color);
    text-decoration: none;
    font-size: 18px;
    position: relative;
}

.nav-item-right {
    cursor: pointer;
}

.nav-item::after {
    content: '';
    width: 0;
    height: 3px;
    background: var(--nav-underline-color);
    position: absolute;
    left: 0;
    bottom: -6px;
    transition: 0.5s;
}

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

.nav-item i, .nav-item-right i {
    margin-right: 8px;
}

.theme-toggle-btn {
    margin: 6px 0px;
    padding: 0;
    transition: all 1s;
    width: 100%;
}

.theme-toggle-btn .dark-theme-btn, 
.theme-toggle-btn .light-theme-btn {
    display: none;
}

.theme-toggle-btn .active {
    display: block;
    animation: fade-in 0.4s ease-out forwards;
    border-radius: 6px;
    padding: 5px;
    color: var(--btn-bg);
    background: var(--btn-text);
    border: 1px solid var(--btn-bg);
    transform: rotateY(180deg);
}

.setting-menu {
  position: absolute;
  display: none;
  flex-direction: column;
  padding: 10px;
  justify-items: flex-start;
  border: 2px solid var(--bg-text-color-8);
  border-top-left-radius: 0px;
  border-top-right-radius: 0px;
  border-bottom-left-radius: 10px;
  border-bottom-right-radius: 10px;
  background-color: var(--bg-color);
  width: 12rem;
  right: 2rem;
  z-index: 90;
}
.setting-menu .language-select {
    font-size: 14px;
}

.setting-menu:not(:active) {
  display: none;  
}

/* ---------- Header ---------- */
.header {
    width: 100%;
    height: 100vh;
    background-image: var(--header-bg-image);
    background-size: cover;
    background-position: center;
}

.header-container {
    padding: 10px 5%;
}

.header-text {
    margin-top: 20%;
    font-size: 30px;
    color: var(--text-color);
}

.header-text h1 {
    margin-top: 20px;
    font-size: 60px;
}

.red-text {
    color: var(--nav-underline-color);
}

.header-container .downloadBtn {
    background: var(--download-btn-bg);
}

.header-container .downloadBtn:hover {
    background: var(--download-hover-btn-bg);
    border-color: var(--download-hover-btn-bg);
}

/* ---------- About ---------- */
.about {
    max-width: 100%;
    color: var(--text-shadow-color);
    background-color: var(--bg-color-1);
    padding: 30px;
    border-radius: 8px;
}

.about-row {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 50px;
}

.about-col-1 {
    flex: 0.3;
}

.about-col-1 .about-image {
    width: 300px;
    max-width: 400px;
    height: 200px;
    max-height: 400px;
    border-radius: 15px;
    box-shadow: 4px 6px 20px 4px var(--bg-color-2), 4px 6px 20px 4px var(--bg-color-2);
}

.about-col-2 {
    flex: 0.7;
    color: var(--bg-text-color-8);
}

/* ---------- Skills ---------- */
.skills {
    max-width: 100%;
    background-color: var(--bg-color-1);
    padding: 30px;
    border-radius: 8px;
}

.skills-row {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 20px;
}

.skills-col {
    width: 32.1%;
    background-color: var(--bg-color-2);
    border: 2px solid var(--bg-text-color-8);
    padding: 10px;
    border-radius: 10px;
    box-shadow: 2px 4px 12px 2px var(--bg-text-color-8), 2px 4px 12px 2px var(--bg-text-color-8);
}

.skills-col:hover {
    box-shadow: 4px 8px 12px 4px var(--hover-color), 4px 8px 12px 4px var(--hover-color);
}

.skills-col-title {
    font-size: 22px;
    padding: 5px;
    color: var(--text-color);
    font-weight: 700;
    text-shadow: 0 0px 6px var(--text-shadow-color);
}

.skills-col-title span:hover {
    color: var(--bg-color-7);
    text-shadow: 2px 2px 6px var(--text-shadow-color);
    font-weight: 900;
}

.skills-col-content {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    padding: 5px;
}

.skills-col-content span {
    border: 1px solid var(--text-color);
    background-color: var(--bg-color-3);
    color: var(--text-color);
    padding: 5px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

.skills-col-content span:hover {
    color: var(--text-color);
    font-weight: bolder;
    box-shadow: 4px 4px 4px 4px var(--bg-color-2), 4px 4px 4px 4px var(--bg-color-2);
}

/* ---------- Experience ---------- */
.timeline {
    max-width: 100%;
    position: relative;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-color-1);
    padding: 30px;
    border-radius: 8px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 29%;
    top: 0;
    width: 2px;
    bottom: 0;
    box-shadow: 2px 6px 20px 4px var(--bg-text-color-8), 2px 6px 20px 4px var(--bg-text-color-8);
    background-color: var(--bg-color-3);
}

.timeline-item {
    position: relative;
    margin-bottom: 30px;
    display: flex;
    opacity: 0;
    transform: translateY(20px);
    animation: fade-in 0.5s ease-out forwards;
    align-items: center;
    gap: 8%;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-left {
    flex: 0.36;
    display: flex;
    flex-direction: column;
    align-items: end;
}

.timeline-date {
    background-color: var(--bg-text-color-8);
    padding: 8px 15px;
    border-radius: 6px;
    font-size: 0.88em;
    white-space: nowrap;
    color: var(--bg-color-8);
    width: 150px;
    text-align: center;
    margin-bottom: 10px;
    box-shadow: 4px 6px 20px 4px var(--bg-color-2), 4px 6px 20px 4px var(--bg-color-2);
}

.timeline-title {
    font-weight: bold;
    color: var(--bg-color);
    font-size: 1.1em;
    line-height: 1.4;
    margin-right: 5px;
    text-shadow: 4px 4px 6px var(--text-color);
}

.timeline-down,
.timeline-up {
    cursor: pointer;
    margin-top: 5px;
    margin-right: 50px;
    display: none;
}

.showArrow {
    display: block;
}

.timeline-profile-detail {
    display: none;
    min-width: 200px;
    width: fit-content;
    background-color: var(--bg-text-color-8);
    padding: 10px;
    border-radius: 10px;
    box-shadow: 4px 6px 20px 4px var(--bg-color-2), 4px 6px 20px 4px var(--bg-color-2);
}

.timeline-profile-detail.showProfile {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.timeline-profile-detail .profile-item {
    display: flex;
    flex-direction: column;
    text-align: end;
}

.profile-item .profile-item-name {
    color: var(--bg-color);
    font-size: 0.95em;
}

.profile-item .profile-item-date {
    font-size: 0.8em;
    color: var(--bg-color-8)
}

.timeline-content {
    color: var(--bg-text-color-8);
    font-size: 0.9em;
    line-height: 1.6;
    padding-left: 0;
    flex: 1;
}

.timeline-content .content-title {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    padding-right: 50px;
    font-weight: 600;
    font-size: 16px;
}

.timeline-content ul {
    padding-left: 20px;
    margin-top: 8px;
}

.timeline-content li {
    margin-bottom: 5px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 27.1%;
    width: 20px;
    height: 20px;
    background-color: var(--text-color);
    border-radius: 50%;
    border: 2px solid var(--bg-color-3);
    box-sizing: border-box;
    box-shadow: 2px 6px 20px 4px var(--bg-color-2), 2px 6px 20px 4px var(--bg-color-2);
}

@keyframes fade-in {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.timeline-item:nth-child(1) {
    animation-delay: 0.1s;
}

.timeline-item:nth-child(2) {
    animation-delay: 0.3s;
}

/* ---------- Certificate ---------- */
.certificate {
    max-width: 100%;
    background-color: var(--bg-color-1);
    padding: 30px;
    border-radius: 8px;
}

.certificate-container {
    display: flex;
    flex-direction: row;
    gap: 50px;
}

.certificate-row {
    display: flex;
    flex: 1;
    flex-direction: column;
    flex-wrap: wrap;
    gap: 20px;
}

.certificate-col {
    flex: 1;
    margin-inline: 30px;
    background-color: var(--bg-color-2);
    border-radius: 10px;
    box-shadow: 2px 4px 12px 2px var(--bg-color-2), 2px 4px 12px 2px var(--bg-color-2);
}

.certificate-col.active-preview {
    margin-inline: 0;
}

.certificate-col:hover {
    box-shadow: 2px 4px 12px 2px var(--text-color), 2px 4px 12px 2px var(--bg-color-2);
}

.certificate-col .certificate-col-time {
    color: var(--bg-color-8);
    background-color: var(--text-color);
    border: 2px solid var(--bg-color-2);
    padding: 5px 10px;
    border-top-right-radius: 10px;
    border-top-left-radius: 10px;
}

.certificate-col .certificate-col-time i {
    cursor: pointer;
    float: right;
}

.certificate-col .certificate-col-title {
    color: var(--text-color);
    font-weight: 700;
    font-size: 22px;
    text-align: center;
    border: 1px solid var(--bg-color-1);
    padding: 10px;
}

.certificate-col .certificate-col-by {
    color: var(--bg-color-8);
    background-color: var(--text-color);
    border: 2px solid var(--bg-color-1);
    padding: 5px 10px;
    text-align: end;
    border-bottom-right-radius: 10px;
    border-bottom-left-radius: 10px;
}

.certificate-preview {
    flex: 1.5;
    border: 5px solid var(--bg-color-1);
    border-radius: 10px;
}

.certificate-preview span {
    display: none;
}

.certificate-preview span.active {
    display: block;
    text-align: center;
    padding: 5px;
}

/* -------------portfolio -------- */
.portfolio {
    max-width: 100%;
    background-color: var(--bg-color-1);
    padding: 30px;
    border-radius: 8px;
}

.portfolio-row {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
}

.portfolio-col {
    flex: 1;
    background-color: var(--bg-color-2);
    border: 2px solid var(--bg-color-1);
    border-radius: 10px;
    box-shadow: 2px 4px 12px 2px var(--bg-color-2), 2px 4px 12px 2px var(--bg-color-2);
    position: relative;
    overflow: hidden;
}

.portfolio-col:hover {
    box-shadow: 4px 8px 12px 4px var(--hover-color), 4px 8px 12px 4px var(--hover-color);
}

.portfolio-col .portfolio-content {
    width: 100%;
    height: 100%;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    transition: transform 0.5s;
    justify-content: space-between;
}

.portfolio-content .portfolio-content-title {
    font-size: 22px;
    padding: 10px;
    color: var(--text-color);
    text-shadow: 0 0px 6px var(--text-shadow-color);
}

.portfolio-content .portfolio-content-desc {
    line-height: 1.2;
    padding: 10px;
}

.portfolio-content .portfolio-content-desc .portfolio-content-time {
    text-align: right;
    margin-top: 10px;
}

.portfolio-content .portfolio-content-tech {
    color: var(--bg-color-8);
    background-color: var(--text-color);
    border: 2px solid var(--bg-color-1);
    padding: 10px;
    align-items: end;
    font-size: 14px;
    border-bottom-right-radius: 10px;
    border-bottom-left-radius: 10px;
}

.portfolio-col .portfolio-layer {
    width: 100%;
    height: 0;
    background: linear-gradient(var(--bg-color-7), var(--text-color));
    border-radius: 10px;
    position: absolute;
    left: 0;
    bottom: 0;
    overflow: hidden;
    display: flex;
    align-items: center;
    flex-direction: column;
    padding: 0 40px;
    text-align: center;
    transition: 0.5s;
}

.portfolio-col .portfolio-layer h2 {
    font-weight: 500;
    margin-top: 50px;
}

.portfolio-col .portfolio-layer a {
    margin-top: 20px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 20px;
    line-height: 60px;
    background: var(--bg-color-3);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    text-align: center;
}

.portfolio-col:hover .portfolio-content {
    transform: scale(1.1);
}

.portfolio-col:hover .portfolio-layer {
    height: 100%;
}

/* ------- Education-------- */
.education {
    max-width: 100%;
    background-color: var(--bg-color-1);
    padding: 30px;
    border-radius: 8px;
}

.education-row {
    display: flex;
    flex: 1;
    flex-direction: column;
    flex-wrap: wrap;
    gap: 20px;
}

.education-col {
    flex: 1;
    margin-inline: 30px;
    background-color: var(--bg-color-2);
    border-radius: 10px;
    box-shadow: 2px 4px 12px 2px var(--bg-color-2), 2px 4px 12px 2px var(--bg-color-2);
}

.education-col .education-col-title {
    border: 2px solid var(--bg-color-1);
    padding: 10px 10px;
    border-top-right-radius: 10px;
    border-top-left-radius: 10px;
    color: var(--text-color);
    font-weight: 700;
    font-size: 20px;
}

.education-col .education-col-title .education-col-marks {
    float: right;
    padding-right: 30px;
}

.education-col .education-col-from {
    color: var(--bg-color-8);
    background-color: var(--text-color);
    border: 2px solid var(--bg-color-1);
    padding: 5px 10px;
    font-size: 14px;
    border-bottom-right-radius: 10px;
    border-bottom-left-radius: 10px;
}

/* ---------- Contact ---------- */
.contact {
    max-width: 100%;
    color: var(--text-shadow-color);
    background-color: var(--bg-color-1);
    padding: 30px;
    border-radius: 8px;
}

.contact-row {
    display: flex;
    flex-direction: row;
    gap: 20px;
}

.contact-left {
    flex: 4;
    display: flex;
    flex-direction: column;
    gap: 20px;
    font-size: 24px;
    transition: transform 0.5s;
}

.contact-left .email span a,
.contact-left .mobile span a {
    cursor: pointer;
    color: var(--text-color);
    text-decoration: none;
}

.contact-left .email span:hover,
.contact-left .mobile span:hover {
    font-weight: 700;
    color: var(--bg-color-7);
}

.contact-left .email i:hover,
.contact-left .mobile i:hover {
    transform: translateY(-5px);
}

.contact-right {
    flex: 6;
}

.social-icons {
    margin-top: 30px;
    display: flex;
    gap: 20px;
}

.social-icons a {
    text-decoration: none;
    font-size: 30px;
    color: var(--text-shadow-color);
    display: inline-block;
    transition: transform 0.5s;
}

.social-icons a:hover {
    transform: translateY(-5px);
}

.contact-left .downloadBtn {
    background: var(--download-btn-bg);
}

.contact-left .downloadBtn:hover {
    background: var(--download-hover-btn-bg);
    border-color: var(--download-hover-btn-bg);
}

.contact-right form .submitBtn {
    margin: 5px 0;
    font-size: 14px;
    background: var(--btn-bg);
    border: var(--text-color);
}

.contact-right form .submitBtn:hover {
    background: var(--text-shadow-color);
    border-color: var(--text-shadow-color);
}

.contact-right form {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

form input,
form textarea {
    width: 100%;
    border: 0;
    outline: none;
    background: var(--btn-bg);
    padding: 10px;
    color: var(--text-color);
    font-size: 16px;
    border-radius: 6px;
}

form textarea {
    resize: none;
}