/* =========================================================
   DESIGN TOKENS
   ========================================================= */

:root {
  /* Colors */
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #0f172a;
  --color-muted: #64748b;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-border: #e2e8f0;
  --nav-bg: rgb(255 255 255 / 82%);
  --nav-menu-bg: rgb(255 255 255 / 94%);
    --nav-border:rgb(226 232 240 / 80%);

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

  --font-mono:
    "JetBrains Mono",
    "SFMono-Regular",
    Consolas,
    "Liberation Mono",
    monospace;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;

  /* Layout */
  --container-width: 1100px;
  --container-padding: 1.25rem;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* Effects */
  --shadow-sm: 0 4px 20px rgb(15 23 42 / 5%);
  --shadow-md: 0 12px 32px rgb(15 23 42 / 7%);

  /* Motion */
  --transition-fast: 180ms ease;
  --transition-normal: 250ms ease-out;
}


/* =========================================================
   RESET
   ========================================================= */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

body {
  min-height: 100vh;
  margin: 0;

  background: var(--color-bg);
  color: var(--color-text);

  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;

  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  max-width: 100%;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

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

h1,
h2,
h3,
p {
  margin: 0;
}


/* =========================================================
   HEADER / NAVIGATION
   ========================================================= */

.header {
  position: fixed;
  z-index: 1000;
  top: 0;
  right: 0;
  left: 0;

  padding: 1rem var(--container-padding);

  pointer-events: none;
}

.nav__theme {
  display: flex;
  align-items: center;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  width: 36px;
  height: 36px;

  padding: 0;

  background: transparent;
  color: var(--color-muted);

  border: 1px solid transparent;
  border-radius: 50%;

  cursor: pointer;

  transition:
    color var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-bg);
  border-color: var(--color-border);

  transform: translateY(-1px);
}

.theme-toggle__icon {
  font-size: 1rem;
  line-height: 1;

  transition: transform 200ms ease;
}

.theme-toggle:hover .theme-toggle__icon {
  transform: rotate(15deg);
}

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

  width: min(100%, var(--container-width));
  min-height: 58px;

  margin-inline: auto;
  padding: 0.75rem 1.25rem;

  background:var(--nav-bg);
  border: 1px solid var(--nav-border);
  border-radius: var(--radius-md);

  box-shadow: var(--shadow-sm);

  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);

  pointer-events: auto;
}

.nav__menu[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav__menu[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav__menu[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}
/* Logo */

.nav__logo {
  flex-shrink: 0;

  color: var(--color-text);

  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.03em;

  transition: color var(--transition-fast);
}

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


/* Navigation links */

.nav__links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav__item {
  position: relative;
}

.nav__link {
  display: block;

  padding: 0.25rem 0;

  color: var(--color-muted);

  font-size: 0.9rem;
  font-weight: 500;

  transition:
    color var(--transition-fast),
    transform var(--transition-fast);
}

.nav__link:hover {
  color: var(--color-text);
  transform: translateY(-1px);
}

.nav__link.active {
  color: var(--color-primary);
  font-weight: 600;
}


/* Underline */

.nav__items::after {
  position: absolute;
  right: 0;
  bottom: -0.35rem;
  left: 0;

  height: 2px;

  background: var(--color-primary);

  border-radius: 999px;

  content: "";

  transform: scaleX(0);
  transform-origin: left;

  transition: transform var(--transition-normal);
}

.nav__item:hover::after,
.nav__item:has(.nav__link.active)::after {
  transform: scaleX(1);
}


/* Mobile menu button */

.nav__menu {
  display: none;

  width: 40px;
  height: 40px;

  padding: 0;

  background: transparent;
  border: 0;

  cursor: pointer;
}

.nav__menu span {
  display: block;

  width: 20px;
  height: 2px;

  margin: 4px auto;

  background: var(--color-text);

  border-radius: 999px;

  transition:
    transform var(--transition-fast),
    opacity var(--transition-fast);
}


/* =========================================================
   GLOBAL CONTAINER / SECTIONS
   ========================================================= */

.section,
.hero {
  width: min(
    calc(100% - (var(--container-padding) * 2)),
    var(--container-width)
  );

  margin-inline: auto;
}

.section {
  padding-block: var(--space-4xl);
}

.section__header {
  max-width: 680px;
  margin-bottom: var(--space-2xl);
}

.section__eyebrow,
.hero__eyebrow {
  margin-bottom: var(--space-sm);

  color: var(--color-primary);

  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.section__title {
  max-width: 650px;

  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.1;
  letter-spacing: -0.04em;
}


/* =========================================================
   HERO
   ========================================================= */

.hero {
  display: flex;
  align-items: center;

  min-height: 100svh;

  padding-block:
    clamp(8rem, 15vw, 11rem)
    clamp(5rem, 10vw, 8rem);
}

.hero__content {
  max-width: 800px;
}

.hero__title {
  max-width: 800px;

  font-size: clamp(2.75rem, 7vw, 5.5rem);
  line-height: 1.02;
  letter-spacing: -0.055em;
}

.hero__title span {
  display: block;
  color: var(--color-primary);
}

.hero__description {
  max-width: 650px;

  margin-top: var(--space-lg);

  color: var(--color-muted);

  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: 1.75;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);

  margin-top: var(--space-xl);
}


/* =========================================================
   BUTTONS
   ========================================================= */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  min-height: 44px;

  padding: 0.7rem 1.1rem;

  border: 1px solid transparent;
  border-radius: var(--radius-sm);

  font-size: 0.9rem;
  font-weight: 600;

  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

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

.button--primary {
  background: var(--color-primary);
  color: #ffffff;
}

.button--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 8px 20px rgb(37 99 235 / 18%);
}

.button--secondary {
  background: var(--color-surface);
  color: var(--color-text);

  border-color: var(--color-border);
}

.button--secondary:hover {
  background: var(--color-bg);
  border-color: #cbd5e1;
}


/* =========================================================
   ABOUT
   ========================================================= */

.about {
  max-width: 760px;
}

.about__content {
  display: grid;
  gap: var(--space-lg);

  color: var(--color-muted);

  font-size: 1.1rem;
  line-height: 1.8;
}


/* =========================================================
   SKILLS
   ========================================================= */

.skills {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.skill-card {
  padding: var(--space-xl);

  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);

  transition:
    transform var(--transition-normal),
    border-color var(--transition-normal),
    box-shadow var(--transition-normal);
}

.skill-card:hover {
  border-color: #cbd5e1;
  box-shadow: var(--shadow-sm);
  transform: translateY(-4px);
}

.skill-card__title {
  margin-bottom: var(--space-sm);

  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.skill-card__description {
  color: var(--color-muted);

  font-size: 0.9rem;
  line-height: 1.7;
}

/* =========================================================
   PROGRAMMING LANGUAGES
   ========================================================= */

.languages {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.75rem 3rem;

  width: 100%;
}

.language {
  min-width: 0;
}

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

  gap: 1rem;
  margin-bottom: 0.65rem;
}

.language__name {
  margin: 0;

  color: var(--color-text);

  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.language__percentage {
  flex-shrink: 0;

  color: var(--color-muted);

  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
}

.language__track {
  width: 100%;
  height: 6px;

  overflow: hidden;

  background: var(--color-border);
  border-radius: 999px;
}

.language__progress {
  width: var(--progress);
  height: 100%;

  background: var(--color-primary);
  border-radius: inherit;

  transform-origin: left;

  animation: language-progress 700ms ease-out both;
}

@keyframes language-progress {
  from {
    opacity: 0;
    transform: scaleX(0);
  }

  to {
    opacity: 1;
    transform: scaleX(1);
  }
}
/* =========================================================
   PROJECTS
   ========================================================= */

.projects {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.project-card {
  min-height: 360px;

  padding: var(--space-xl);

  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);

  transition:
    transform var(--transition-normal),
    box-shadow var(--transition-normal),
    border-color var(--transition-normal);
}

.project-card:hover {
  border-color: #cbd5e1;
  box-shadow: var(--shadow-md);
  transform: translateY(-5px);
}

.project-card__content {
  display: flex;
  flex-direction: column;

  height: 100%;
}

.project-card__number {
  margin-bottom: auto;

  color: var(--color-primary);

  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
}

.project-card__title {
  margin-top: var(--space-2xl);

  font-size: 1.5rem;
  letter-spacing: -0.03em;
}

.project-card__description {
  margin-top: var(--space-sm);

  color: var(--color-muted);

  font-size: 0.9rem;
  line-height: 1.7;
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;

  width: fit-content;

  margin-top: var(--space-lg);

  color: var(--color-primary);

  font-size: 0.9rem;
  font-weight: 600;

  transition:
    color var(--transition-fast),
    gap var(--transition-fast);
}

.project-card__link:hover {
  color: var(--color-primary-hover);
  gap: 0.75rem;
}


/* =========================================================
   CONTACT
   ========================================================= */

.contact {
  max-width: 760px;
  margin-inline: auto;
}

.contact .section__header {
  margin-bottom: var(--space-2xl);
}

.contact__form {
  display: grid;
  gap: var(--space-lg);

  padding: clamp(1.5rem, 4vw, 2.5rem);

  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);

  box-shadow: var(--shadow-sm);
}

.contact__field {
  display: grid;
  gap: var(--space-xs);
}

.contact__label {
  color: var(--color-text);

  font-size: 0.875rem;
  font-weight: 600;
}

.contact__input {
  width: 100%;

  padding: 0.8rem 0.9rem;

  background: var(--color-bg);
  color: var(--color-text);

  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);

  font: inherit;
  font-size: 0.9rem;

  outline: none;

  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background var(--transition-fast);
}

.contact__input::placeholder {
  color: var(--color-muted);
  opacity: 0.75;
}

.contact__input:hover {
  border-color: #cbd5e1;
}

.contact__input:focus {
  border-color: var(--color-primary);

  box-shadow:
    0 0 0 3px rgb(37 99 235 / 10%);
}

.contact__textarea {
  min-height: 150px;

  resize: vertical;
  line-height: 1.6;
}

.contact__submit {
  justify-self: start;

  margin-top: var(--space-xs);
  padding: 0.75rem 1.25rem;

  background: var(--color-primary);
  color: #ffffff;

  border: 1px solid transparent;
  border-radius: var(--radius-sm);

  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;

  cursor: pointer;

  transition:
    background var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.contact__submit:hover {
  background: var(--color-primary-hover);

  transform: translateY(-1px);

  box-shadow: var(--shadow-sm);
}

.contact__submit:active {
  transform: translateY(0);
}

/* =========================================================
   FOOTER
   ========================================================= */

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);

  width: min(
    calc(100% - (var(--container-padding) * 2)),
    var(--container-width)
  );

  margin-inline: auto;
  padding-block: var(--space-xl);

  border-top: 1px solid var(--color-border);

  color: var(--color-muted);

  font-size: 0.85rem;
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
}

.footer__links a {
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: var(--color-primary);
}


/* =========================================================
   FOCUS ACCESSIBILITY
   ========================================================= */

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgb(37 99 235 / 25%);
  outline-offset: 4px;
}


/* =========================================================
   RESPONSIVE
   ========================================================= */

@media (max-width: 900px) {

  .skills {
    grid-template-columns: repeat(2, 1fr);
  }

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


@media (max-width: 700px) {

  :root {
    --container-padding: 1rem;
  }

  .header {
    padding-top: 0.75rem;
  }

  .nav {
    min-height: 54px;
    padding-inline: 1rem;
  }

  .nav__links {
  position: absolute;
  top: calc(100% + 0.75rem);
  right: 0;
  left: 0;

  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;

  padding: 0.5rem;

  background: var(--nav-menu-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);

  box-shadow: var(--shadow-md);

  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);

  /* Closed */
  opacity: 0;
  visibility: hidden;
  pointer-events: none;

  transform: translateY(-12px);

  transition:
    opacity 220ms ease-out,
    transform 220ms ease-out,
    visibility 220ms ease-out;
}

.nav__links.is-open {
  /* Open */
  opacity: 1;
  visibility: visible;
  pointer-events: auto;

  transform: translateY(0);
}

  .nav__item::after {
    display: none;
  }

  .nav__link {
    padding: 0.75rem 0.85rem;
    border-radius: var(--radius-sm);
  }

  .nav__link:hover {
    background: var(--color-bg);
    transform: none;
  }

  .nav__link.active {
    background: rgb(37 99 235 / 7%);
  }

  .nav__menu {
    display: block;
  }

  .hero {
    min-height: auto;
    padding-top: 9rem;
  }

  .skills,
  .projects {
    grid-template-columns: 1fr;
  }
.languages {
    grid-template-columns: 1fr;
    gap: 1.5rem;
}
  .project-card {
    min-height: 320px;
  }

  .section {
    padding-block: var(--space-3xl);
  }
    .contact__form {
    padding: var(--space-lg);
  }

  .contact__submit {
    width: 100%;
  }

  .footer {
    flex-direction: column;
    align-items: flex-start;
  }
}


/* =========================================================
   REDUCED MOTION
   ========================================================= */

@media (prefers-reduced-motion: reduce) {

  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* =========================================================
   DARK MODE
   ========================================================= */

[data-theme="dark"] {
  --color-bg: #0B1120;
  --color-surface: #111827;
  --color-text: #F8FAFC;
  --color-muted: #94A3B8;
  --color-primary: #60A5FA;
  --color-border: #1E293B;
  --nav-bg: rgb(17 24 39 / 82%);
  --nav-menu-bg: rgb(17 24 39 / 94%);
    --nav-border: rgb(51 65 85 / 70%);
}