/* ===== Variables ===== */
:root {
  /* Colors */
  --first-color: #3a86ff;
  --first-color-alt: #2667cc;
  --first-color-light: #7aa6ff;
  --title-color: #1a1a2e;
  --text-color: #4a4a4a;
  --text-color-light: #8f8f8f;
  --body-color: #f8f9fa;
  --container-color: #ffffff;

  /* Font and typography */
  --body-font: "Open Sans", sans-serif;
  --title-font: "Poppins", sans-serif;

  /* Font sizes */
  --big-font-size: 2rem;
  --h1-font-size: 1.5rem;
  --h2-font-size: 1.25rem;
  --h3-font-size: 1.125rem;
  --normal-font-size: 0.938rem;
  --small-font-size: 0.813rem;
  --smaller-font-size: 0.75rem;

  /* Font weights */
  --font-medium: 500;
  --font-semi-bold: 600;

  /* Margins */
  --mb-0-25: 0.25rem;
  --mb-0-5: 0.5rem;
  --mb-0-75: 0.75rem;
  --mb-1: 1rem;
  --mb-1-5: 1.5rem;
  --mb-2: 2rem;
  --mb-2-5: 2.5rem;

  /* z-index */
  --z-tooltip: 10;
  --z-fixed: 100;
  --z-modal: 1000;

  /* Transition */
  --transition: all 0.3s ease;
}

/* Dark theme variables */
body.dark-theme {
  --title-color: #f1f3f5;
  --text-color: #ced4da;
  --body-color: #1a1a2e;
  --container-color: #16213e;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--body-font);
  background-color: var(--body-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: var(--transition);
}

h1,
h2,
h3 {
  color: var(--title-color);
  font-family: var(--title-font);
  font-weight: var(--font-semi-bold);
}

ul {
  list-style: none;
}

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

img {
  max-width: 100%;
  height: auto;
}

button,
input,
textarea {
  font-family: var(--body-font);
  font-size: var(--normal-font-size);
}

button {
  cursor: pointer;
  border: none;
  outline: none;
}

/* ===== Reusable Classes ===== */
.section {
  padding: 5rem 0 1rem;
}

.section__title {
  font-size: var(--h1-font-size);
  text-align: center;
  margin-bottom: var(--mb-1);
}

.section__subtitle {
  display: block;
  font-size: var(--small-font-size);
  text-align: center;
  color: var(--text-color-light);
  margin-bottom: var(--mb-2-5);
}

.container {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding: 0 1rem;
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.button {
  display: inline-block;
  background-color: var(--first-color);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: var(--font-medium);
  transition: var(--transition);
}

.button:hover {
  background-color: var(--first-color-alt);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(58, 134, 255, 0.25);
}

.button--flex {
  display: inline-flex;
  align-items: center;
  column-gap: 0.5rem;
}

.button__icon {
  font-size: 1.25rem;
  transition: var(--transition);
}

.button:hover .button__icon {
  transform: translateX(3px);
}

/* ===== Header & Nav ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--container-color);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
  z-index: var(--z-fixed);
  transition: var(--transition);
}

.nav {
  height: 3.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav__logo {
  font-weight: var(--font-semi-bold);
  color: var(--title-color);
}

.nav__logo:hover {
  color: var(--first-color);
}

.nav__menu {
  position: fixed;
  bottom: 1rem;
  left: 0;
  right: 0;
  width: 90%;
  margin: 0 auto;
  background-color: var(--container-color);
  padding: 1.5rem 2rem;
  border-radius: 1rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
  z-index: var(--z-fixed);
}

.nav__list {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav__link {
  font-size: var(--small-font-size);
  color: var(--text-color);
  font-weight: var(--font-medium);
  transition: var(--transition);
}

.nav__link:hover {
  color: var(--first-color);
}

.nav__link.active-link {
  color: var(--first-color);
}

.nav__close,
.nav__toggle {
  font-size: 1.5rem;
  color: var(--title-color);
  cursor: pointer;
}

.nav__close:hover,
.nav__toggle:hover {
  color: var(--first-color);
}

/* Show menu */
.show-menu {
  bottom: 2rem;
}

/* Change background header */
.scroll-header {
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}

/* ===== Home ===== */
.home__container {
  row-gap: 3rem;
  padding-top: 4rem;
}

.home__content {
  text-align: center;
}

.home__title {
  font-size: var(--big-font-size);
  margin-bottom: var(--mb-0-75);
}

.home__subtitle {
  font-size: var(--h2-font-size);
  color: var(--text-color-light);
  margin-bottom: var(--mb-1-5);
}

.home__description {
  margin-bottom: var(--mb-2);
}

.home__social {
  display: flex;
  justify-content: center;
  column-gap: 1.5rem;
  margin-bottom: var(--mb-2-5);
}

.home__social-link {
  font-size: 1.5rem;
  color: var(--text-color);
  transition: var(--transition);
}

.home__social-link:hover {
  color: var(--first-color);
  transform: translateY(-3px);
}

.home__img {
  justify-self: center;
}

.home__blob-img {
  width: 250px;
  border-radius: 50%;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-15px);
  }
  100% {
    transform: translateY(0);
  }
}

/* ===== About ===== */
.about__container {
  row-gap: 2.5rem;
}

.about__img {
  width: 250px;
  border-radius: 1.5rem;
  justify-self: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.about__description {
  text-align: center;
  margin-bottom: var(--mb-2);
}

.about__buttons {
  display: flex;
  justify-content: center;
}

/* ===== Skills ===== */
.skills__container {
  row-gap: 2rem;
}

.skills__group {
  background-color: var(--container-color);
  padding: 1.5rem;
  border-radius: 1rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.skills__group:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.skills__title {
  font-size: var(--h3-font-size);
  margin-bottom: var(--mb-1);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skills__list {
  display: grid;
  row-gap: 1rem;
}

.skills__item {
  margin-bottom: var(--mb-1);
}

.skills__info {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--mb-0-5);
}

.skills__name {
  font-size: var(--normal-font-size);
  font-weight: var(--font-medium);
}

.skills__level {
  font-size: var(--small-font-size);
  color: var(--text-color-light);
}

.skills__bar {
  height: 8px;
  border-radius: 4px;
  background-color: #e9ecef;
  overflow: hidden;
}

.skills__percentage {
  display: block;
  height: 100%;
  background-color: var(--first-color);
  border-radius: 4px;
  width: 0;
  transition: width 1.5s ease-in-out;
}

/* ===== Projects ===== */
.projects__container {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.projects__card {
  background-color: var(--container-color);
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.projects__card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.projects__img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: var(--transition);
}

.projects__card:hover .projects__img {
  transform: scale(1.05);
}

.projects__content {
  padding: 1.5rem;
}

.projects__title {
  font-size: var(--h3-font-size);
  margin-bottom: var(--mb-0-5);
}

.projects__description {
  font-size: var(--small-font-size);
  color: var(--text-color-light);
  margin-bottom: var(--mb-1);
}

.projects__button {
  display: inline-flex;
  align-items: center;
  column-gap: 0.5rem;
  font-size: var(--small-font-size);
  color: var(--first-color);
  transition: var(--transition);
}

.projects__button:hover {
  color: var(--first-color-alt);
  transform: translateX(3px);
}

/* ===== Certifications ===== */
.certification__container {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.certification__card {
  background-color: var(--container-color);
  border-radius: 1rem;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.certification__card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.certification__img {
  width: 100px;
  height: auto;
  margin: 0 auto var(--mb-1);
}

.certification__title {
  font-size: var(--h3-font-size);
  margin-bottom: var(--mb-0-5);
}

.certification__button {
  display: inline-flex;
  align-items: center;
  column-gap: 0.5rem;
  font-size: var(--small-font-size);
  color: var(--first-color);
  transition: var(--transition);
}

.certification__button:hover {
  color: var(--first-color-alt);
  transform: translateX(3px);
}

/* ===== Contact ===== */
.contact__container {
  row-gap: 3rem;
}

.contact__info {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.contact__card {
  background-color: var(--container-color);
  padding: 1.5rem;
  border-radius: 1rem;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.contact__card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.contact__icon {
  font-size: 2rem;
  color: var(--first-color);
  margin-bottom: var(--mb-0-75);
}

.contact__title {
  font-size: var(--h3-font-size);
  margin-bottom: var(--mb-0-5);
}

.contact__data {
  font-size: var(--small-font-size);
  color: var(--text-color-light);
  margin-bottom: var(--mb-1);
}

.contact__button {
  display: inline-flex;
  align-items: center;
  column-gap: 0.5rem;
  font-size: var(--small-font-size);
  color: var(--first-color);
  transition: var(--transition);
}

.contact__button:hover {
  color: var(--first-color-alt);
  transform: translateX(3px);
}

.contact__form {
  display: grid;
  row-gap: 1.5rem;
}

.contact__inputs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  column-gap: 1.5rem;
}

.contact__content {
  position: relative;
  height: 3rem;
  border-bottom: 1px solid #e9ecef;
}

.contact__input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: 1rem 0;
  background: none;
  border: none;
  outline: none;
  z-index: 1;
}

.contact__label {
  position: absolute;
  top: 0.75rem;
  left: 0;
  font-size: var(--small-font-size);
  color: var(--text-color-light);
  transition: var(--transition);
}

.contact__area {
  height: 7rem;
}

.contact__area textarea {
  resize: none;
}

.contact__input:focus + .contact__label {
  top: -0.75rem;
  left: 0;
  font-size: var(--smaller-font-size);
  color: var(--first-color);
  z-index: 10;
}

.contact__input:not(:placeholder-shown).contact__input:not(:focus)
  + .contact__label {
  top: -0.75rem;
  font-size: var(--smaller-font-size);
  z-index: 10;
}

/* ===== Footer ===== */
.footer {
  background-color: var(--title-color);
  color: #fff;
  padding: 3rem 0;
}

.footer__container {
  row-gap: 2.5rem;
  text-align: center;
}

.footer__title {
  font-size: var(--h1-font-size);
  margin-bottom: var(--mb-0-5);
}

.footer__description {
  font-size: var(--small-font-size);
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--mb-1-5);
}

.footer__list {
  display: flex;
  justify-content: center;
  column-gap: 1.5rem;
  margin-bottom: var(--mb-2);
}

.footer__link {
  font-size: var(--small-font-size);
  color: rgba(255, 255, 255, 0.7);
  transition: var(--transition);
}

.footer__link:hover {
  color: #fff;
}

.footer__social {
  display: flex;
  justify-content: center;
  column-gap: 1.5rem;
  margin-bottom: var(--mb-2-5);
}

.footer__social-link {
  font-size: 1.5rem;
  color: rgba(255, 255, 255, 0.7);
  transition: var(--transition);
}

.footer__social-link:hover {
  color: #fff;
  transform: translateY(-3px);
}

.footer__copy {
  font-size: var(--smaller-font-size);
  color: rgba(255, 255, 255, 0.5);
}

/* ===== Scroll Up ===== */
.scrollup {
  position: fixed;
  right: 1rem;
  bottom: -20%;
  background-color: var(--first-color);
  color: #fff;
  padding: 0.5rem;
  border-radius: 0.5rem;
  display: inline-flex;
  opacity: 0.8;
  z-index: var(--z-tooltip);
  transition: var(--transition);
}

.scrollup:hover {
  background-color: var(--first-color-alt);
  opacity: 1;
  transform: translateY(-0.25rem);
}

.scrollup__icon {
  font-size: 1.25rem;
}

/* Show Scroll Up */
.show-scroll {
  bottom: 3rem;
}

/* ===== Scroll Bar ===== */
::-webkit-scrollbar {
  width: 0.6rem;
  background-color: #e9ecef;
}

::-webkit-scrollbar-thumb {
  background-color: var(--first-color);
  border-radius: 0.5rem;
}

::-webkit-scrollbar-thumb:hover {
  background-color: var(--first-color-alt);
}

/* ===== Media Queries ===== */
@media screen and (min-width: 768px) {
  .section {
    padding: 7rem 0 2rem;
  }

  .nav {
    height: calc(3.5rem + 1rem);
  }

  .nav__menu {
    width: initial;
    position: initial;
    background-color: transparent;
    box-shadow: none;
    padding: 0;
    margin: 0;
  }

  .nav__list {
    display: flex;
    column-gap: 2rem;
  }

  .nav__link {
    font-size: var(--normal-font-size);
  }

  .nav__close,
  .nav__toggle {
    display: none;
  }

  .home__container {
    grid-template-columns: repeat(2, 1fr);
    align-items: center;
    padding-top: 6rem;
  }

  .home__content {
    text-align: initial;
  }

  .home__social {
    justify-content: initial;
  }

  .about__container {
    grid-template-columns: repeat(2, 1fr);
    align-items: center;
  }

  .about__description {
    text-align: initial;
  }

  .about__buttons {
    justify-content: initial;
  }

  .skills__container {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 2rem;
  }
}

@media screen and (min-width: 992px) {
  .container {
    margin-left: auto;
    margin-right: auto;
  }

  .button {
    padding: 1rem 1.75rem;
  }

  .home__container {
    column-gap: 4rem;
  }

  .home__img {
    width: 350px;
  }

  .about__img {
    width: 350px;
  }

  .skills__container {
    grid-template-columns: repeat(3, 1fr);
  }
}