:root {
  --primary: #0f766e;
  --accent: #fb923c;
  --bg-light: #f9fafb;
  --bg-dark: #111827;
  --surface: #ffffff;
  --surface-alt: #f1f5f9;
  --text-dark: #1e293b;
  --text-muted: #475569;
  --border-color: rgba(15, 118, 110, 0.12);
  --shadow-color: rgba(30, 41, 59, 0.08);
  --transition: 0.3s ease;
}

[data-theme="dark"] {
  --surface: #0f172a;
  --surface-alt: #1e293b;
  --bg-light: #0f172a;
  --text-dark: #e2e8f0;
  --text-muted: #94a3b8;
  --border-color: rgba(148, 163, 184, 0.2);
  --shadow-color: rgba(2, 6, 23, 0.6);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "Poppins", Arial, sans-serif;
  background-color: var(--bg-light);
  color: var(--text-dark);
  line-height: 1.6;
  transition: background-color var(--transition), color var(--transition);
}

img {
  max-width: 100%;
  display: block;
  border-radius: 1rem;
}

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

.material-symbols-rounded {
  font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 24;
}

.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  font-size: 1.1rem;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

section {
  padding: 5rem 0;
}

.container {
  width: min(1100px, 90%);
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 999;
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition), border-color var(--transition);
}

[data-theme="dark"] .header {
  background-color: rgba(15, 23, 42, 0.85);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.logo {
  font-family: "Poppins", sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.04em;
}

.nav__links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
  margin: 0;
  padding: 0;
}

.nav__links a {
  font-weight: 500;
  position: relative;
}

.nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.4rem;
  height: 2px;
  width: 100%;
  background-color: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.nav__links a:hover::after,
.nav__links a:focus-visible::after,
.nav__links a.active::after {
  transform: scaleX(1);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 0.3rem;
  width: 2.4rem;
  height: 2.4rem;
  align-items: center;
  justify-content: center;
}

.nav__toggle span {
  width: 1.5rem;
  height: 2px;
  background-color: var(--text-dark);
  transition: transform var(--transition), opacity var(--transition);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 50%;
  background-color: var(--surface);
  border: 1px solid var(--border-color);
  margin-right: 1rem;
  transition: transform var(--transition), background-color var(--transition);
}

.theme-toggle:hover {
  transform: translateY(-2px);
}

.theme-toggle .icon {
  font-size: 1.1rem;
  color: var(--accent);
}

.theme-toggle .icon-moon {
  display: none;
}

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

[data-theme="dark"] .theme-toggle .icon-moon {
  display: inline-flex;
}

.hero {
  padding-top: 6rem;
  background: linear-gradient(135deg, rgba(15, 118, 110, 0.08), rgba(15, 118, 110, 0));
}

.hero__content {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: center;
  gap: 3rem;
}

.hero__welcome {
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.hero__title {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  line-height: 1.1;
  font-family: "Poppins", sans-serif;
  margin-bottom: 0.8rem;
}

.hero__subtitle {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 1.5rem;
}

.hero__description {
  max-width: 34rem;
  color: var(--text-muted);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

.hero__image-wrapper {
  position: relative;
  padding: 1rem;
  border-radius: 1.5rem;
  background: var(--surface);
  box-shadow: 0 20px 40px var(--shadow-color);
  overflow: hidden;
}

.hero__image-wrapper::after {
  content: "";
  position: absolute;
  inset: 1rem;
  border-radius: 1.2rem;
  border: 2px dashed rgba(15, 118, 110, 0.2);
  pointer-events: none;
}

.hero__image img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.8rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), color var(--transition);
}

.btn .icon {
  font-size: 1rem;
}

.btn--primary {
  background: linear-gradient(135deg, var(--primary), #0d9488);
  color: #ffffff;
  box-shadow: 0 10px 20px rgba(15, 118, 110, 0.25);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 30px rgba(15, 118, 110, 0.3);
}

.btn--ghost {
  background-color: var(--surface);
  border: 1px solid var(--border-color);
  color: var(--primary);
}

.btn--ghost:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
}

.section__head {
  text-align: center;
  margin-bottom: 3rem;
}

.section__title {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-family: "Poppins", sans-serif;
  margin-bottom: 0.5rem;
}

.section__subtitle {
  color: var(--text-muted);
  max-width: 32rem;
  margin: 0 auto;
}

.about__grid {
  display: grid;
  gap: 2.5rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.about__bio {
  background-color: var(--surface);
  padding: 2.5rem;
  border-radius: 1.5rem;
  box-shadow: 0 15px 35px var(--shadow-color);
  border: 1px solid var(--border-color);
}

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

.timeline__item {
  background-color: var(--surface);
  padding: 1.8rem;
  border-radius: 1.3rem;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition);
}

.timeline__item::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15, 118, 110, 0.08), rgba(251, 146, 60, 0.08));
  opacity: 0;
  transition: opacity var(--transition);
}

.timeline__item:hover {
  transform: translateY(-4px);
  border-color: rgba(15, 118, 110, 0.4);
}

.timeline__item:hover::before {
  opacity: 1;
}

.timeline__date {
  display: inline-block;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 0.6rem;
}

.timeline__title {
  font-family: "Poppins", sans-serif;
  margin-bottom: 0.4rem;
}

.about__university {
  background-color: var(--surface);
  padding: 2rem;
  border-radius: 1.5rem;
  border: 1px solid var(--border-color);
  box-shadow: 0 15px 35px var(--shadow-color);
  display: grid;
  gap: 1.2rem;
  align-items: center;
  text-align: center;
}

.about__university img {
  width: min(180px, 60%);
  margin: 0 auto;
  border-radius: 1rem;
  border: 1px solid var(--border-color);
  padding: 0.5rem;
  background-color: var(--surface-alt);
}

.about__university-text h3 {
  margin: 0;
  font-family: "Poppins", sans-serif;
}

.about__university-text p {
  margin: 0;
  color: var(--text-muted);
}

.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.8rem;
}

.skill-card {
  background-color: var(--surface);
  padding: 2rem;
  border-radius: 1.3rem;
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 30px var(--shadow-color);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
  --skill-progress: 0%;
}

.skill-card::after {
  content: "";
  position: absolute;
  width: 120%;
  height: 120%;
  left: -10%;
  top: 70%;
  background: radial-gradient(circle at center, rgba(15, 118, 110, 0.25), transparent 60%);
  transform: translateY(0);
  transition: transform 0.8s ease;
  opacity: 0;
}

.skill-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(15, 118, 110, 0.2);
}

.skill-card:hover::after {
  transform: translateY(-45%);
  opacity: 1;
}

.skill-card__icon {
  width: 3.5rem;
  height: 3.5rem;
  display: grid;
  place-items: center;
  border-radius: 1rem;
  background: rgba(15, 118, 110, 0.12);
  color: var(--primary);
  font-size: 1.6rem;
}

.skill-card__title {
  margin-top: 1rem;
  margin-bottom: 0.6rem;
  font-family: "Poppins", sans-serif;
}

.skill-card__progress {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1rem 0;
}

.skill-card__bar {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.15);
  position: relative;
  overflow: hidden;
}

.skill-card__bar::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), #0d9488);
  transition: width 1.2s ease;
}

.skill-card.animate .skill-card__bar::after {
  width: var(--skill-progress, 80%);
}

.skill-card__value {
  font-weight: 600;
  color: var(--primary);
}

.skills__tools {
  margin-top: 3rem;
  background-color: var(--surface);
  border-radius: 1.3rem;
  border: 1px solid var(--border-color);
  box-shadow: 0 12px 30px var(--shadow-color);
  padding: 2.2rem;
  text-align: center;
}

.skills__tools-title {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 1.8rem;
  font-family: "Poppins", sans-serif;
  font-size: 1.15rem;
  color: var(--primary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.skills__tools-title i {
  font-size: 1.2rem;
}

.tools__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.2rem;
}

.tool-card {
  background: var(--surface-alt);
  border: 1px solid var(--border-color);
  border-radius: 1.2rem;
  padding: 1.4rem 1rem;
  display: grid;
  gap: 0.75rem;
  justify-items: center;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px rgba(15, 118, 110, 0.2);
  border-color: rgba(15, 118, 110, 0.4);
}

.tool-card__icon {
  width: 3rem;
  height: 3rem;
  border-radius: 1rem;
  display: grid;
  place-items: center;
  background: rgba(15, 118, 110, 0.12);
  color: var(--primary);
  font-size: 1.6rem;
}

.tool-card__label {
  font-weight: 600;
  color: var(--text-dark);
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.8rem;
}

.project-card {
  background-color: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: 1.3rem;
  overflow: hidden;
  box-shadow: 0 15px 30px var(--shadow-color);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 25px 45px rgba(15, 118, 110, 0.25);
}

.project-card__image {
  position: relative;
  overflow: hidden;
}

.project-card__image img {
  width: 100%;
  transition: transform 0.8s ease;
}

.project-card:hover .project-card__image img {
  transform: scale(1.08);
}

.project-card__body {
  padding: 1.5rem;
}

.project-card__title {
  margin: 0 0 0.5rem;
  font-family: "Poppins", sans-serif;
}

.project-card__description {
  color: var(--text-muted);
  margin: 0;
}

.apps__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.app-card {
  background-color: var(--surface);
  border-radius: 1.3rem;
  border: 1px solid var(--border-color);
  box-shadow: 0 12px 28px var(--shadow-color);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}

.app-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 22px 42px rgba(15, 118, 110, 0.22);
}

.app-card__image {
  position: relative;
  aspect-ratio: 9 / 16;
  background: linear-gradient(135deg, rgba(15, 118, 110, 0.15), rgba(251, 146, 60, 0.15));
  display: grid;
  place-items: center;
  overflow: hidden;
}

.app-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s ease;
  border-radius: 0;
}

.app-card:hover .app-card__image img {
  transform: scale(1.05);
}

.app-card__body {
  padding: 1.4rem 1.6rem 1.8rem;
  display: grid;
  gap: 0.6rem;
}

.app-card__title {
  margin: 0;
  font-family: "Poppins", sans-serif;
}

.app-card__description {
  margin: 0;
  color: var(--text-muted);
}

.contact__grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
}

.contact__form,
.contact__info {
  background-color: var(--surface);
  padding: 2.5rem;
  border-radius: 1.5rem;
  border: 1px solid var(--border-color);
  box-shadow: 0 15px 35px var(--shadow-color);
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.3rem;
}

label {
  font-weight: 600;
}

input,
textarea {
  padding: 0.9rem 1rem;
  border-radius: 1rem;
  border: 1px solid var(--border-color);
  background-color: var(--surface-alt);
  color: var(--text-dark);
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.2);
}

.contact__list {
  list-style: none;
  padding: 0;
  margin: 2rem 0 1.5rem;
  display: grid;
  gap: 1rem;
}

.contact__list li {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--text-muted);
}

.contact__list .icon {
  color: var(--primary);
}

.contact__bio {
  color: var(--text-muted);
}

.social-links {
  display: flex;
  gap: 1rem;
  margin: 1.5rem 0;
}

.social-links a {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background-color: var(--surface-alt);
  border: 1px solid var(--border-color);
  color: var(--primary);
  transition: transform var(--transition), border-color var(--transition), color var(--transition);
}

.social-links a:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
  color: var(--accent);
}

.footer {
  background-color: var(--surface-alt);
  padding: 1.5rem 0;
  border-top: 1px solid var(--border-color);
}

.footer__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  color: var(--text-muted);
}

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

.footer__socials a {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background-color: var(--surface);
  border: 1px solid var(--border-color);
  transition: transform var(--transition), border-color var(--transition);
}

.footer__socials a:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  color: var(--primary);
}

.modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.modal.show {
  opacity: 1;
  pointer-events: auto;
}

.modal__overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
}

.modal__content {
  background-color: var(--surface);
  color: var(--text-dark);
  border-radius: 1.5rem;
  padding: 2rem;
  width: min(700px, 90%);
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.35);
  border: 1px solid var(--border-color);
  transform: translateY(30px);
  transition: transform var(--transition);
}

.modal.show .modal__content {
  transform: translateY(0);
}

.modal__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background-color: var(--surface-alt);
  color: var(--text-dark);
  display: grid;
  place-items: center;
  border: 1px solid var(--border-color);
}

.modal__body {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
}

.modal__body img {
  width: 100%;
  border-radius: 1rem;
  border: 1px solid var(--border-color);
}

.modal__text {
  display: grid;
  gap: 1rem;
}

.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--surface);
  color: var(--primary);
  padding: 1rem 1.5rem;
  border-radius: 1rem;
  box-shadow: 0 20px 45px rgba(15, 118, 110, 0.15);
  transform: translateY(120%);
  opacity: 0;
  transition: transform var(--transition), opacity var(--transition);
  border: 1px solid var(--border-color);
  z-index: 99999;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 992px) {
  .hero__content {
    grid-template-columns: 1fr;
  }

  .hero__text {
    text-align: center;
  }

  .hero__description {
    margin: 0 auto;
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__image-wrapper {
    max-width: 360px;
    margin: 0 auto;
  }

  .hero__image {
    order: -1;
  }

  .about__grid,
  .contact__grid {
    grid-template-columns: 1fr;
  }

  .skills__tools {
    padding: 2rem 1.5rem;
  }

  .tools__grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }

  .about__bio,
  .about__timeline,
  .about__university,
  .contact__form,
  .contact__info {
    padding: 2rem;
  }

  .apps__grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }

  .footer__socials {
    justify-content: center;
  }

  .theme-toggle {
    margin-right: 0.5rem;
  }
}

@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    position: fixed;
    inset: 0 0 0 35%;
    flex-direction: column;
    padding: 6rem 2rem;
    background-color: var(--surface);
    border-left: 1px solid var(--border-color);
    transform: translateX(100%);
    transition: transform var(--transition);
    gap: 1.5rem;
  }

  .skills__tools-title {
    margin-bottom: 1.2rem;
  }

  .tool-card {
    padding: 1.2rem 0.9rem;
  }

  .app-card__body {
    text-align: center;
  }

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

  .nav__links.show {
    transform: translateX(0);
  }

  .nav__links li {
    width: 100%;
  }

  .nav__links a {
    font-size: 1.1rem;
  }

  .nav__toggle.active span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .nav__toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav__toggle.active span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .footer__content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 576px) {
  section {
    padding: 4rem 0;
  }

  .container {
    width: min(92%, 520px);
  }

  .nav__links {
    inset: 0;
    border-left: none;
  }

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

  .tool-card {
    padding: 1.1rem;
  }

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

  .social-links {
    gap: 0.8rem;
  }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .toast {
    right: 1rem;
    left: 1rem;
  }

  .hero__title {
    font-size: clamp(2.2rem, 9vw, 2.8rem);
  }

  .hero__subtitle {
    font-size: 1.05rem;
  }

  .hero__image-wrapper {
    padding: 0.8rem;
  }

  .hero__image-wrapper::after {
    inset: 0.8rem;
  }

  .about__bio,
  .about__timeline,
  .about__university,
  .contact__form,
  .contact__info {
    padding: 1.7rem;
  }

  .modal__content {
    width: min(95%, 520px);
    padding: 1.6rem;
  }

  .footer__content {
    gap: 1rem;
  }
}

.hero__actions,
.social-links,
.footer__socials {
  flex-wrap: wrap;
}

@media (max-width: 420px) {
  .logo {
    font-size: 1.2rem;
  }

  .theme-toggle {
    width: 2.3rem;
    height: 2.3rem;
  }

  .nav__toggle {
    width: 2.2rem;
    height: 2.2rem;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .skill-card {
    padding: 1.7rem;
  }

  .contact__list li {
    align-items: flex-start;
  }
}

/* IntersectionObserver fallback */
.no-js .reveal {
  opacity: 1;
  transform: none;
}

/* Comments:
 * - Update buttons, links, and project details as needed.
 * - Replace placeholder project images under the images/ folder with your work.
 * - Adjust color variables to personalize the theme.
 */