:root {
  --bg: #f7fafc;
  --bg-alt: #eef4f7;
  --surface: #ffffff;
  --text: #0f1f2e;
  --muted: #546778;
  --border: #dde6ec;
  --accent: #0e8f86;
  --accent-strong: #0a6f68;
  --accent-soft: #d8f1ee;
  --shadow: 0 10px 30px rgba(15, 31, 46, 0.08);
  --radius: 14px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b141c;
    --bg-alt: #0f1b25;
    --surface: #13222e;
    --text: #e6eef4;
    --muted: #93a7b7;
    --border: #22384a;
    --accent: #2cc4b6;
    --accent-strong: #5fd8cc;
    --accent-soft: #123a3a;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0b141c;
  --bg-alt: #0f1b25;
  --surface: #13222e;
  --text: #e6eef4;
  --muted: #93a7b7;
  --border: #22384a;
  --accent: #2cc4b6;
  --accent-strong: #5fd8cc;
  --accent-soft: #123a3a;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

.container { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 640px) { .container { padding: 0 32px; } }

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.02em; }
h1 { font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 700; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.25rem); font-weight: 700; margin-bottom: 1rem; }
h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: .4rem; }

.eyebrow {
  font-family: "JetBrains Mono", monospace;
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--accent);
  margin-bottom: .75rem;
}
.lead { font-size: 1.125rem; color: var(--muted); max-width: 40rem; margin-top: 1.25rem; }
.muted { color: var(--muted); }
.accent { color: var(--accent); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: .8rem 1.4rem; border-radius: 999px;
  background: var(--accent); color: #fff; font-weight: 600;
  border: 1px solid var(--accent);
  transition: background .2s, transform .2s;
}
.btn:hover { background: var(--accent-strong); border-color: var(--accent-strong); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--surface); border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: .45rem 1rem; font-size: .9rem; color: #fff !important; }
:root[data-theme="dark"] .btn, :root[data-theme="dark"] .btn-sm { color: #062420 !important; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .btn:not(.btn-ghost),
  :root:not([data-theme="light"]) .btn-sm { color: #062420 !important; }
}
:root[data-theme="dark"] .btn-ghost { color: var(--text) !important; }

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 700; }
.brand-mark {
  display: grid; place-items: center; width: 34px; height: 34px; border-radius: 9px;
  background: var(--accent); color: #fff; font-size: .85rem; letter-spacing: .02em;
}
.nav-links { display: flex; align-items: center; gap: 1.5rem; font-size: .95rem; }
.nav-links a:not(.btn) { color: var(--muted); transition: color .2s; }
.nav-links a:not(.btn):hover { color: var(--accent); }

.theme-toggle {
  display: grid; place-items: center; width: 36px; height: 36px;
  border-radius: 50%; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer;
}
.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; transition: .25s; }

@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--surface); border-bottom: 1px solid var(--border);
    padding: .5rem 16px 1rem; display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: .75rem 0; }
  .nav-links .btn-sm { margin-top: .5rem; }
  .theme-toggle { margin-top: .75rem; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* Hero */
.hero { padding: 5rem 0 4.5rem; }
.hero-inner { display: grid; gap: 3rem; align-items: center; }
@media (min-width: 900px) { .hero-inner { grid-template-columns: 1.25fr 1fr; } }
.hero-cta { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.hero-cta.center { justify-content: center; }

.hero-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 20px; padding: 2rem 1.5rem; box-shadow: var(--shadow);
}
.profile {
  display: flex; align-items: center; gap: 1rem;
  padding-bottom: 1.5rem; margin-bottom: 1.75rem; border-bottom: 1px solid var(--border);
}
.avatar {
  flex-shrink: 0; width: 96px; height: 96px; border-radius: 50%; object-fit: cover;
  border: 3px solid var(--surface); box-shadow: 0 0 0 3px var(--accent);
}
.avatar-fallback {
  display: grid; place-items: center; background: var(--accent-soft);
  color: var(--accent); font-size: 1.9rem; font-weight: 700;
}
.profile-name { display: block; font-size: 1.15rem; }
.profile-title { display: block; font-size: .9rem; color: var(--muted); }

.flow { display: flex; align-items: center; justify-content: space-between; gap: .25rem; }
.flow-node {
  display: flex; flex-direction: column; align-items: center; gap: .5rem;
  text-align: center; font-size: .78rem; font-weight: 600; color: var(--muted); line-height: 1.3;
}
.flow-node svg {
  width: 52px; height: 52px; padding: 14px; border-radius: 14px;
  background: var(--bg-alt); color: var(--accent); border: 1px solid var(--border);
}
.node-accent svg { background: var(--accent); color: #fff; border-color: var(--accent); }
.flow-line {
  flex: 1; height: 2px; background: var(--border); position: relative; overflow: hidden;
  margin-bottom: 2.4rem; min-width: 20px;
}
.flow-line i {
  position: absolute; top: 0; left: -30%; width: 30%; height: 100%;
  background: var(--accent); animation: pulse 2.2s linear infinite;
}
.flow-line:nth-of-type(4) i { animation-delay: 1.1s; }
@keyframes pulse { to { left: 100%; } }
@media (prefers-reduced-motion: reduce) { .flow-line i { animation: none; left: 35%; } }

.stats {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
  margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--border);
}
.stats strong { display: block; font-size: 1.75rem; color: var(--accent); line-height: 1.1; }
.stats span { font-size: .85rem; color: var(--muted); }

/* Sections */
.section { padding: 5rem 0; }
.section-alt { background: var(--bg-alt); }

.about { display: grid; gap: 2rem; }
@media (min-width: 900px) { .about { grid-template-columns: 1fr 1.6fr; gap: 4rem; } }
.about-body p { color: var(--muted); margin-bottom: 1rem; font-size: 1.05rem; }

.cards { display: grid; gap: 1.25rem; margin-top: 2rem; }
@media (min-width: 640px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .cards { grid-template-columns: repeat(3, 1fr); } }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.6rem; transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--accent); }
.card p { color: var(--muted); font-size: .95rem; }
.card-icon {
  display: grid; place-items: center; width: 46px; height: 46px; border-radius: 12px;
  background: var(--accent-soft); color: var(--accent); margin-bottom: 1rem;
}

.projects { display: grid; gap: 1.25rem; margin-top: 2rem; }
@media (min-width: 760px) { .projects { grid-template-columns: repeat(2, 1fr); } }
.project {
  display: flex; flex-direction: column; gap: 1rem;
  background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--accent);
  border-radius: var(--radius); padding: 1.6rem;
  transition: box-shadow .2s, transform .2s;
}
.project:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.project-head h3 { font-size: 1.2rem; margin-bottom: .2rem; }
.project-meta { font-family: "JetBrains Mono", monospace; font-size: .78rem; color: var(--accent); }
.project-summary { color: var(--muted); }
.project-highlights { list-style: none; display: grid; gap: .45rem; }
.project-highlights li { position: relative; padding-left: 1.5rem; font-size: .95rem; }
.project-highlights li::before {
  content: ""; position: absolute; left: 0; top: .45em; width: .8rem; height: .45rem;
  border-left: 2px solid var(--accent); border-bottom: 2px solid var(--accent); transform: rotate(-45deg);
}
.project-foot { margin-top: auto; display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; padding-top: .5rem; }
.project-tech { display: flex; flex-wrap: wrap; gap: .4rem; }
.project-tech span {
  font-size: .78rem; padding: .2rem .65rem; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent-strong);
}
.project-link { font-weight: 600; font-size: .9rem; color: var(--accent); }
.project-link:hover { text-decoration: underline; }

.skills { display: grid; gap: 2.5rem; }
@media (min-width: 900px) { .skills { grid-template-columns: 1fr 1.4fr; gap: 4rem; align-items: center; } }
.skill-list { list-style: none; display: grid; gap: 1.1rem; }
.skill-name { display: block; font-weight: 600; font-size: .95rem; margin-bottom: .35rem; }
.bar { display: block; height: 8px; border-radius: 99px; background: var(--bg-alt); border: 1px solid var(--border); overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; background: var(--accent); border-radius: 99px; transition: width 1.2s ease; }
.skills.visible .bar i { width: var(--w); }

.tags { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 2.5rem; }
.tags span {
  font-size: .85rem; padding: .35rem .85rem; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--border); color: var(--muted);
}

.timeline { margin-top: 2rem; display: grid; gap: 1.5rem; position: relative; padding-left: 1.75rem; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 6px; bottom: 6px; width: 2px; background: var(--border); }
.tl-item { position: relative; }
.tl-dot {
  position: absolute; left: -1.75rem; top: 5px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft);
}

.contact { text-align: center; }
.contact .lead { margin-left: auto; margin-right: auto; }

.contact-form {
  max-width: 640px; margin: 2rem auto 0; text-align: left;
  display: grid; gap: 1rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem; box-shadow: var(--shadow);
}
.form-row { display: grid; gap: 1rem; }
@media (min-width: 640px) { .form-row { grid-template-columns: 1fr 1fr; } }
.contact-form label { display: grid; gap: .35rem; font-size: .9rem; font-weight: 600; }
.contact-form input, .contact-form textarea {
  font: inherit; font-weight: 400; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 10px; padding: .7rem .85rem; width: 100%;
}
.contact-form textarea { resize: vertical; }
.contact-form input:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft);
}
.contact-form .btn { justify-self: start; border: 0; cursor: pointer; font: inherit; font-weight: 600; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }

.alert { max-width: 640px; margin: 1.5rem auto 0; padding: .85rem 1rem; border-radius: 10px; font-weight: 500; }
.alert-success { background: var(--accent-soft); color: var(--accent-strong); border: 1px solid var(--accent); }
.alert-error { background: #fdecec; color: #a12626; border: 1px solid #f2b8b8; }

.footer { border-top: 1px solid var(--border); padding: 1.75rem 0; font-size: .9rem; color: var(--muted); }
.footer-inner { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.footer a:hover { color: var(--accent); }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }