/* ============================================================
   CSS Custom Properties — Day / Night
   ============================================================ */
:root {
  /* Day mode */
  --bg:        #F4F8F5;
  --bg-alt:    #EBF2ED;
  --ink:       #24352B;
  --ink-muted: #4A6357;
  --sage:      #7FA38B;
  --moss:      #3F6B4F;
  --moss-light:#5A8A6A;
  --border:    #C9DDD1;
  --card-bg:   #FFFFFF;
  --code-bg:   #1A2E22;
  --code-ink:  #C8E6C9;

  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 2px 12px rgba(63,107,79,.10);
  --shadow-hover: 0 6px 24px rgba(63,107,79,.18);
  --transition: .22s ease;

  --font: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

[data-theme="dark"] {
  --bg:        #132018;
  --bg-alt:    #1B2D22;
  --ink:       #EAF3ED;
  --ink-muted: #9AB8A4;
  --sage:      #8FB89B;
  --moss:      #5FA875;
  --moss-light:#72C088;
  --border:    #2D4A36;
  --card-bg:   #1E3028;
  --code-bg:   #0D1A11;
  --code-ink:  #A5D6A7;

  --shadow: 0 2px 12px rgba(0,0,0,.35);
  --shadow-hover: 0 6px 24px rgba(0,0,0,.50);
}

/* ============================================================
   Reset & Base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  transition: background var(--transition), color var(--transition);
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ============================================================
   Nav
   ============================================================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; gap: 2rem;
  padding: .9rem 2rem;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nav__logo {
  font-family: var(--mono);
  font-size: .95rem;
  font-weight: 500;
  color: var(--moss);
  margin-right: auto;
}

.nav__links {
  display: flex; gap: 1.8rem; list-style: none;
}

.nav__links a {
  font-size: .875rem;
  font-weight: 500;
  color: var(--ink-muted);
  transition: color var(--transition);
}
.nav__links a:hover,
.nav__links a.active { color: var(--moss); }

/* Theme toggle — floating button */
.nav__theme-btn {
  display: none;
}

.theme-fab {
  position: fixed; bottom: 1.8rem; right: 1.8rem; z-index: 200;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1.5px solid var(--border);
  box-shadow: 0 4px 20px rgba(0,0,0,.15);
  cursor: pointer;
  font-size: 1.15rem;
  display: flex; align-items: center; justify-content: center;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.theme-fab:hover {
  transform: translateY(-3px) scale(1.08);
  box-shadow: 0 8px 28px rgba(63,107,79,.25);
  border-color: var(--moss);
}

/* Burger (mobile) */
.nav__burger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.nav__burger span {
  display: block; width: 22px; height: 2px;
  background: var(--ink); border-radius: 2px;
  transition: all var(--transition);
}

/* ============================================================
   Layout helpers
   ============================================================ */
.container { max-width: 1080px; margin: 0 auto; padding: 0 2rem; }
.container--narrow { max-width: 680px; margin: 0 auto; padding: 0 2rem; }

.section {
  padding: 96px 0 80px;
}
.section--alt { background: var(--bg-alt); }

.section__title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700; margin-bottom: .5rem;
  color: var(--ink);
}
.section__sub {
  color: var(--ink-muted); font-size: .95rem;
  margin-bottom: 2.5rem;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 2rem 80px;
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.hero__cta { justify-content: center; }

.hero__tag {
  display: inline-block;
  font-size: .78rem; font-weight: 600; letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--moss);
  background: color-mix(in srgb, var(--moss) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--moss) 28%, transparent);
  padding: .25rem .75rem; border-radius: 20px;
  margin-bottom: 1.2rem;
}

.hero__title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.12;
  margin-bottom: 1.2rem;
  letter-spacing: -.02em;
}

.hero__sub {
  font-size: 1.05rem;
  color: var(--ink-muted);
  margin-bottom: 2.2rem;
  line-height: 1.8;
}

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

/* Code block decoration */
.hero__visual { display: flex; justify-content: center; }

.hero__code-block {
  font-family: var(--mono);
  font-size: .82rem;
  background: var(--code-bg);
  color: var(--code-ink);
  padding: 1.6rem 2rem;
  border-radius: var(--radius);
  border: 1px solid color-mix(in srgb, var(--moss) 25%, transparent);
  display: flex; flex-direction: column; gap: .4rem;
  min-width: 320px;
  box-shadow: var(--shadow);
}
.cb__line { white-space: pre; display: block; }
.cb__kw  { color: #89CBA9; }
.cb__fn  { color: #82C4A0; }
.cb__name { color: #ADE0BE; }

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .65rem 1.4rem;
  border-radius: var(--radius-sm);
  font-size: .9rem; font-weight: 600;
  transition: all var(--transition); cursor: pointer;
  border: 1.5px solid transparent;
}

.btn--primary {
  background: var(--moss);
  color: #fff;
}
.btn--primary:hover {
  background: var(--moss-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--moss) 40%, transparent);
}

.btn--ghost {
  border-color: var(--sage);
  color: var(--ink-muted);
}
.btn--ghost:hover {
  border-color: var(--moss);
  color: var(--moss);
  background: color-mix(in srgb, var(--moss) 8%, transparent);
}

/* ============================================================
   About
   ============================================================ */
.about__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about__text p { margin-bottom: 1rem; color: var(--ink-muted); }
.about__text p:last-child { margin-bottom: 0; }
.about__text strong { color: var(--moss); }

.about__facts {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem;
}

.fact {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 1rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.fact:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }

.fact__num {
  display: block; font-size: 1.9rem; font-weight: 700;
  color: var(--moss); line-height: 1.1; margin-bottom: .3rem;
}
.fact__label { font-size: .78rem; color: var(--ink-muted); line-height: 1.4; }

/* ============================================================
   Skills
   ============================================================ */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.skill-group {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.2rem;
  box-shadow: var(--shadow);
}

.skill-group__title {
  font-size: .8rem; font-weight: 700; letter-spacing: .07em;
  text-transform: uppercase; color: var(--moss);
  margin-bottom: 1rem;
}

.tags { display: flex; flex-wrap: wrap; gap: .5rem; }

.tag {
  font-size: .78rem; font-weight: 500;
  padding: .25rem .65rem; border-radius: 20px;
  background: color-mix(in srgb, var(--sage) 15%, var(--bg));
  color: var(--ink-muted);
  border: 1px solid color-mix(in srgb, var(--sage) 30%, transparent);
  transition: all var(--transition);
}
.tag:hover {
  background: color-mix(in srgb, var(--moss) 15%, var(--bg));
  color: var(--moss);
  border-color: var(--moss);
}

.tag--sm { font-size: .73rem; padding: .2rem .55rem; }

.tag--learning {
  border-style: dashed;
  opacity: .8;
  background: transparent;
}

/* ============================================================
   Experience
   ============================================================ */
.exp__header {
  margin-bottom: 2rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--border);
}

.exp__company {
  display: block; font-size: 1.2rem; font-weight: 700; color: var(--moss);
}
.exp__role {
  display: block; font-size: 1rem; font-weight: 500; margin: .2rem 0;
}
.exp__period {
  font-size: .83rem; color: var(--ink-muted);
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition);
}
.project-card:hover { box-shadow: var(--shadow-hover); }

.project-card__label {
  font-size: .72rem; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--sage);
  margin-bottom: .5rem;
}

.project-card__title {
  font-size: 1.15rem; font-weight: 700; margin-bottom: .8rem;
}

.project-card__stack { margin-bottom: 1.4rem; }

.star { display: flex; flex-direction: column; gap: 1rem; }

.star__item {
  padding-left: 1rem;
  border-left: 2px solid var(--border);
  transition: border-color var(--transition);
}
.star__item:hover { border-left-color: var(--sage); }
.star__item--result { border-left-color: var(--moss); }

.star__label {
  display: inline-block;
  font-size: .72rem; font-weight: 700; letter-spacing: .07em;
  text-transform: uppercase; color: var(--moss);
  margin-bottom: .3rem;
}

.star__item p { font-size: .9rem; color: var(--ink-muted); }

/* ============================================================
   Blog
   ============================================================ */
.blog__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.4rem;
  margin-bottom: 2rem;
}

.blog-card {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.blog-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }

.blog-card__cat {
  display: inline-block;
  font-size: .72rem; font-weight: 700; letter-spacing: .07em;
  text-transform: uppercase; color: var(--moss);
  background: color-mix(in srgb, var(--moss) 12%, transparent);
  padding: .2rem .6rem; border-radius: 20px;
  margin-bottom: .8rem;
}

.blog-card__title {
  font-size: 1rem; font-weight: 600; margin-bottom: .5rem;
  line-height: 1.4;
}

.blog-card__excerpt { font-size: .85rem; color: var(--ink-muted); margin-bottom: 1rem; }

.blog-card__date { font-size: .78rem; color: var(--sage); font-family: var(--mono); }

.blog__cta { text-align: center; }

/* ============================================================
   Contact
   ============================================================ */
#contact .section__title,
#contact .section__sub { text-align: center; }

.contact__links {
  display: flex; flex-wrap: wrap;
  justify-content: center; gap: 1rem;
  margin-top: 2rem;
}

.contact__link {
  display: flex; align-items: center; gap: .5rem;
  padding: .7rem 1.4rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .9rem; font-weight: 500; color: var(--ink-muted);
  transition: all var(--transition);
}
.contact__link:hover {
  border-color: var(--moss); color: var(--moss);
  background: color-mix(in srgb, var(--moss) 8%, transparent);
  transform: translateY(-2px);
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  text-align: center; padding: 2rem;
  font-size: .82rem; color: var(--ink-muted);
  border-top: 1px solid var(--border);
}

/* ============================================================
   Scroll-reveal animation
   ============================================================ */
.reveal {
  opacity: 0; transform: translateY(20px);
  transition: opacity .55s ease, transform .55s ease;
}
.reveal.visible { opacity: 1; transform: none; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 860px) {
  .hero {
    padding-top: 100px;
  }

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

@media (max-width: 640px) {
  .nav__links { display: none; }
  .nav__burger { display: flex; }
  .nav__links.open {
    display: flex; flex-direction: column;
    position: fixed; top: 57px; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 1.2rem 2rem 1.6rem;
    gap: 1.2rem;
  }

  .about__facts { grid-template-columns: 1fr 1fr; }
  .skills__grid { grid-template-columns: 1fr; }
  .project-card { padding: 1.4rem; }
  .section { padding: 72px 0 60px; }
}