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

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


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

:root {
  /* Colors — dark theme (default) */
  --color-bg:          #0d0d0d;
  --color-surface:     #161616;
  --color-border:      #2a2a2a;
  --color-text:        #e8e8e8;
  --color-text-muted:  #888888;
  --color-accent:      #7c6aff;
  --color-accent-hover:#9d8fff;

  /* Typography */
  --font-heading: 'Syne', sans-serif;
  --font-body:    'DM Sans', sans-serif;

  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  2rem;
  --text-4xl:  3rem;
  --text-5xl:  4.5rem;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Layout */
  --max-width:    1100px;
  --nav-height:   64px;
  --radius:       8px;

  /* Transitions */
  --transition: 200ms ease;
}

[data-theme="light"] {
  --color-bg:          #f9f9f9;
  --color-surface:     #ffffff;
  --color-border:      #e2e2e2;
  --color-text:        #111111;
  --color-text-muted:  #666666;
  --color-accent:      #5b4de0;
  --color-accent-hover:#7c6aff;
}


/* ============================================================
   BASE
   ============================================================ */

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  overflow-x: hidden; /* prevent horizontal scroll when hero elements scatter off-screen */
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.15;
}

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

a:hover {
  color: var(--color-accent-hover);
}

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

ul {
  list-style: none;
}


/* ============================================================
   SKIP LINK
   ============================================================ */

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-6);
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-weight: 600;
  z-index: 200;
  transition: top var(--transition);
}

.skip-link:focus {
  top: var(--space-2);
  color: #fff;
}


/* ============================================================
   NAV
   ============================================================ */

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.nav__brand {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.05em;
}

.nav__brand:hover {
  color: var(--color-accent);
}

.nav__links {
  display: flex;
  gap: var(--space-8);
}

.nav__links a {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav__links a:hover {
  color: var(--color-text);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2);
  transition: color var(--transition), border-color var(--transition);
  line-height: 0;
}

.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

/* In dark mode: show sun (switch to light). In light mode: show moon (switch to dark). */
.theme-toggle__moon { display: none; }
.theme-toggle__sun  { display: block; }

[data-theme="light"] .theme-toggle__moon { display: block; }
[data-theme="light"] .theme-toggle__sun  { display: none; }

/* Groups theme toggle + hamburger on the right */
.nav__controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Hamburger button — hidden on desktop, revealed via media query */
.nav__hamburger {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-muted);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  padding: var(--space-2);
  line-height: 0;
  transition: color var(--transition), border-color var(--transition);
}

.nav__hamburger:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

/* Toggle hamburger ↔ close icons via aria-expanded */
.nav__hamburger-close { display: none; }
.nav__hamburger-open  { display: block; }

.nav__hamburger[aria-expanded="true"] .nav__hamburger-open  { display: none; }
.nav__hamburger[aria-expanded="true"] .nav__hamburger-close { display: block; }


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

.hero {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  padding-top: var(--nav-height);
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

/* Scatter animation prep — each element will be moved by JS on scroll */
.hero__greeting,
.hero__name,
.hero__tagline,
.hero__sub,
.hero__cta {
  will-change: transform, opacity;
  transform-origin: center center;
}

@media (prefers-reduced-motion: reduce) {
  .hero__greeting,
  .hero__name,
  .hero__tagline,
  .hero__sub,
  .hero__cta {
    will-change: auto;
  }
}

.hero__greeting {
  color: var(--color-accent);
  font-size: var(--text-lg);
  font-weight: 500;
  margin-bottom: var(--space-2);
}

.hero__name {
  font-size: clamp(var(--text-4xl), 8vw, var(--text-5xl));
  font-weight: 800;
  color: #39ff14;
  text-shadow:
    0 0 7px rgba(57, 255, 20, 0.9),
    0 0 20px rgba(57, 255, 20, 0.7),
    0 0 40px rgba(57, 255, 20, 0.5),
    0 0 80px rgba(57, 255, 20, 0.3);
  margin-bottom: var(--space-4);
  animation: neon-pulse 2.5s ease-in-out infinite alternate;
}

@keyframes neon-pulse {
  from {
    text-shadow:
      0 0 7px rgba(57, 255, 20, 0.9),
      0 0 20px rgba(57, 255, 20, 0.7),
      0 0 40px rgba(57, 255, 20, 0.5),
      0 0 80px rgba(57, 255, 20, 0.3);
  }
  to {
    text-shadow:
      0 0 10px rgba(57, 255, 20, 1),
      0 0 30px rgba(57, 255, 20, 0.9),
      0 0 60px rgba(57, 255, 20, 0.8),
      0 0 120px rgba(57, 255, 20, 0.5),
      0 0 200px rgba(57, 255, 20, 0.3);
  }
}

[data-theme="light"] .hero__name {
  color: #1c8a00;
  text-shadow:
    0 0 6px rgba(28, 138, 0, 0.5),
    0 0 15px rgba(28, 138, 0, 0.3);
  animation: neon-pulse-light 2.5s ease-in-out infinite alternate;
}

@keyframes neon-pulse-light {
  from {
    text-shadow:
      0 0 6px rgba(28, 138, 0, 0.5),
      0 0 15px rgba(28, 138, 0, 0.3);
  }
  to {
    text-shadow:
      0 0 10px rgba(28, 138, 0, 0.7),
      0 0 25px rgba(28, 138, 0, 0.5),
      0 0 50px rgba(28, 138, 0, 0.3);
  }
}

.hero__tagline {
  font-size: var(--text-xl);
  color: var(--color-text-muted);
  max-width: 560px;
}

.hero__sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 560px;
  margin-top: var(--space-4);
  line-height: 1.8;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-8);
  background-color: var(--color-accent);
  color: #fff;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  padding: var(--space-3) var(--space-8);
  border-radius: var(--radius);
  transition: background-color var(--transition), transform var(--transition);
}

.hero__cta:hover {
  background-color: var(--color-accent-hover);
  color: #fff;
  transform: translateY(-2px);
}


/* ============================================================
   SECTIONS (shared)
   ============================================================ */

.about,
.skills,
.projects,
.contact {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
  padding-block: var(--space-24);
}

.about h2,
.skills h2,
.projects h2,
.contact h2 {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-8);
}


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

/* Scroll-reveal: elements start hidden and slide up into view */
.about-reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.about p {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 640px;
  line-height: 1.8;
}

.about p + p {
  margin-top: var(--space-6);
}

.about strong {
  color: var(--color-text);
  font-weight: 600;
}


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

.skills__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.skills__card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: border-color var(--transition), transform var(--transition);
}

.skills__card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
}

.skills__card-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
}

.skills__role {
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.skills__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  list-style: none;
}

.skills__list li {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  padding-left: var(--space-4);
  position: relative;
}

.skills__list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

.skills__list strong {
  color: var(--color-text);
  font-weight: 600;
}


/* ============================================================
   PROJECTS
   ============================================================ */

.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: border-color var(--transition), transform var(--transition);
}

.card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
}

.card__title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
}

.card__description {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  flex: 1;
}

.card__link {
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  align-self: flex-start;
}


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

.contact p {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
}

.contact a {
  font-weight: 500;
}


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

.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  max-width: 560px;
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form__group label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
}

.form__group input,
.form__group textarea {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  padding: var(--space-3) var(--space-4);
  transition: border-color var(--transition);
  width: 100%;
}

.form__group input::placeholder,
.form__group textarea::placeholder {
  color: var(--color-text-muted);
}

.form__group input:focus,
.form__group textarea:focus {
  border-color: var(--color-accent);
  outline: none;
}

.form__group textarea {
  resize: vertical;
}

.form__submit {
  align-self: flex-start;
  background-color: var(--color-accent);
  border: none;
  border-radius: var(--radius);
  color: #fff;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  padding: var(--space-3) var(--space-8);
  transition: background-color var(--transition);
}

.form__submit:hover {
  background-color: var(--color-accent-hover);
}


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

.footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}


/* ============================================================
   RESPONSIVE — tablet & below (768px)
   ============================================================ */

@media (max-width: 768px) {
  .skills__grid,
  .projects__grid {
    grid-template-columns: 1fr;
  }
}


/* ============================================================
   RESPONSIVE — mobile (640px and below)
   ============================================================ */

@media (max-width: 640px) {

  /* ── Mobile nav ── */
  .nav__hamburger {
    display: flex;
  }

  /* Hide links by default; shown as a dropdown when .is-open is toggled */
  .nav__links {
    display: none;
    position: absolute;   /* anchored to the fixed <header> */
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-2) var(--space-6);
  }

  .nav__links.is-open {
    display: flex;
  }

  .nav__links li {
    border-bottom: 1px solid var(--color-border);
  }

  .nav__links li:last-child {
    border-bottom: none;
  }

  .nav__links a {
    display: block;
    padding: var(--space-4) 0;
    font-size: var(--text-base);
    letter-spacing: 0.03em;
  }

  /* ── Hero ── */
  .hero {
    padding-inline: var(--space-4);
    align-items: center;
    text-align: center;
  }

  .hero__name {
    font-size: clamp(var(--text-3xl), 10vw, var(--text-4xl));
  }

  .hero__tagline {
    font-size: var(--text-base);
  }

  .hero__sub {
    font-size: var(--text-sm);
  }

  .hero__cta {
    align-self: center;
  }

  /* ── Sections ── */
  .about,
  .skills,
  .projects,
  .contact {
    padding-block: var(--space-16);
    padding-inline: var(--space-4);
  }

  .about h2,
  .skills h2,
  .projects h2,
  .contact h2 {
    font-size: var(--text-2xl);
  }

  .about p {
    font-size: var(--text-base);
  }

  /* ── Cards ── */
  .skills__card,
  .card {
    padding: var(--space-6);
  }

  /* ── Contact form ── */
  .contact__form {
    max-width: 100%;
  }

  .form__submit {
    width: 100%;
    text-align: center;
    justify-content: center;
  }
}