:root {
  /* Dark theme (default) */
  --bg: #0b1220;
  --bg-alt: #0f1a2e;
  --surface: #131f36;
  --surface-2: #18253f;
  --border: #243352;
  --text: #eef2f9;
  --muted: #9fb0cc;
  --primary: #2f6df6;
  --primary-strong: #1d4ed8;
  --accent: #22c7a9;
  --accent-strong: #14a98e;
  --radius: 14px;
  --shadow: 0 18px 40px -20px rgba(0, 0, 0, 0.7);
  --font-sans: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

[data-theme="light"] {
  --bg: #f6f8fc;
  --bg-alt: #ffffff;
  --surface: #ffffff;
  --surface-2: #f1f5fb;
  --border: #e2e8f3;
  --text: #0e1b30;
  --muted: #5a6b86;
  --primary: #1d4ed8;
  --primary-strong: #1742b4;
  --accent: #0d9488;
  --accent-strong: #0b7c72;
  --shadow: 0 18px 40px -24px rgba(15, 30, 60, 0.35);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 96px; background-color: var(--bg); }

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5 { font-weight: 700; letter-spacing: -0.02em; }

a { text-decoration: none; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 14px;
}

/* ===== Top bar ===== */
.topbar {
  background: var(--primary-strong);
  color: #fff;
  font-size: 0.8rem;
  padding: 7px 0;
}
.topbar-status { display: inline-flex; align-items: center; gap: 8px; font-weight: 500; }
.topbar .dot { width: 8px; height: 8px; border-radius: 50%; background: #4ade80; box-shadow: 0 0 0 0 rgba(74,222,128,0.6); animation: pulse 2s infinite; }
.topbar-meta { opacity: 0.85; font-family: var(--font-mono); font-size: 0.72rem; }
@keyframes pulse { 0%{box-shadow:0 0 0 0 rgba(74,222,128,.6)} 70%{box-shadow:0 0 0 7px rgba(74,222,128,0)} 100%{box-shadow:0 0 0 0 rgba(74,222,128,0)} }

/* ===== Navbar ===== */
.site-nav {
  top: 33px;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  padding: 12px 0;
  transition: all 0.3s ease;
}
.site-nav.scrolled { top: 0; border-bottom-color: var(--border); padding: 10px 0; box-shadow: var(--shadow); }
.brand-mark {
  display: inline-grid; place-items: center;
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; font-weight: 800; font-size: 0.95rem; letter-spacing: -0.04em;
}
.brand-mark.sm { width: 30px; height: 30px; font-size: 0.8rem; }
.brand-text { font-weight: 800; font-size: 1.15rem; color: var(--text); }
.brand-accent { color: var(--accent); }
.site-nav .nav-link { color: var(--muted); font-weight: 500; font-size: 0.95rem; padding: 6px 12px; border-radius: 8px; transition: color .2s, background .2s; }
.site-nav .nav-link:hover, .site-nav .nav-link.active { color: var(--text); background: var(--surface); }

.btn-icon {
  width: 38px; height: 38px; display: inline-grid; place-items: center;
  border-radius: 10px; border: 1px solid var(--border); background: var(--surface); color: var(--text);
}
.btn-icon:hover { border-color: var(--accent); color: var(--accent); }
.lang-select { width: auto; background: var(--surface); border: 1px solid var(--border); color: var(--text); font-weight: 600; }
.lang-select:focus { box-shadow: none; border-color: var(--accent); }

.btn-accent { background: var(--accent); border: 1px solid var(--accent); color: #06231d; font-weight: 700; border-radius: 10px; transition: all .2s; }
.btn-accent:hover { background: var(--accent-strong); border-color: var(--accent-strong); color: #06231d; transform: translateY(-1px); }
.btn-outline-light { border: 1px solid var(--border); color: var(--text); border-radius: 10px; font-weight: 600; }
.btn-outline-light:hover { background: var(--surface-2); color: var(--text); border-color: var(--accent); }

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: 180px 0 90px;
  background:
    radial-gradient(900px 500px at 80% -10%, color-mix(in srgb, var(--primary) 24%, transparent), transparent),
    linear-gradient(180deg, var(--bg-alt), var(--bg));
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 54px 54px; opacity: 0.18; mask-image: radial-gradient(700px 400px at 75% 20%, #000, transparent);
}
.hero .container { position: relative; z-index: 1; }
.hero-title { font-size: clamp(2.2rem, 5vw, 3.6rem); line-height: 1.08; margin-bottom: 18px; }
.hero-subtitle { font-size: 1.12rem; color: var(--muted); max-width: 560px; }
.hero-stack span { display: block; font-family: var(--font-mono); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); margin-bottom: 10px; }
.stack-badges { display: flex; flex-wrap: wrap; gap: 8px; }
.stack-badge { font-family: var(--font-mono); font-size: 0.78rem; padding: 5px 12px; border: 1px solid var(--border); border-radius: 50px; background: var(--surface); color: var(--text); }

.hero-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 20px;
  padding: 22px; box-shadow: var(--shadow); max-width: 380px; margin-left: auto;
}
.hero-photo { width: 100%; border-radius: 14px; aspect-ratio: 1/1; object-fit: cover; }
.hero-card-body { padding-top: 16px; }
.hero-card-body h3 { font-size: 1.3rem; margin-bottom: 2px; }
.hero-card-body p { color: var(--muted); font-size: 0.92rem; margin-bottom: 14px; }
.hero-card-links { display: flex; gap: 10px; }
.hero-card-links a { width: 40px; height: 40px; display: grid; place-items: center; border-radius: 10px; background: var(--surface-2); color: var(--text); border: 1px solid var(--border); font-size: 1.1rem; transition: all .2s; }
.hero-card-links a:hover { background: var(--accent); color: #06231d; border-color: var(--accent); }

/* ===== Stats ===== */
.stats-band { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 40px 0; }
.stat-num { font-size: 2.4rem; font-weight: 800; color: var(--accent); line-height: 1; }
.stat-label { color: var(--muted); font-size: 0.9rem; margin-top: 6px; }

/* ===== Sections ===== */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { max-width: 720px; margin: 0 auto 52px; }
.section-title { font-size: clamp(1.8rem, 3.5vw, 2.6rem); margin-bottom: 14px; }
.section-lead { color: var(--muted); font-size: 1.05rem; max-width: 640px; }
.section-head .section-lead { margin-inline: auto; }

/* ===== Services ===== */
.service-card { height: 100%; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 24px; transition: transform .25s, border-color .25s; }
.service-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.service-icon { width: 52px; height: 52px; border-radius: 12px; display: grid; place-items: center; font-size: 1.5rem; background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent); margin-bottom: 18px; }
.service-card h5 { font-size: 1.12rem; margin-bottom: 8px; }
.service-card p { color: var(--muted); font-size: 0.94rem; margin: 0; }

/* ===== About ===== */
.about-text { color: var(--muted); font-size: 1.02rem; }
.value-card { display: flex; gap: 14px; align-items: flex-start; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; height: 100%; }
.value-card i { font-size: 1.5rem; color: var(--accent); margin-top: 2px; }
.value-card strong { display: block; margin-bottom: 4px; }
.value-card span { color: var(--muted); font-size: 0.9rem; }

/* ===== Projects ===== */
.project-card { position: relative; height: 100%; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; transition: border-color .25s; }
.project-card:hover { border-color: var(--accent); }
.project-tag { display: inline-flex; align-items: center; font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: .1em; color: var(--accent); padding: 4px 10px; border: 1px solid var(--accent); border-radius: 50px; margin-bottom: 14px; }
.project-tag.tag-progress { color: var(--muted); border-color: var(--border); }
.project-card h4 { font-size: 1.4rem; margin-bottom: 10px; }
.project-card p { color: var(--muted); margin-bottom: 16px; }
.project-meta { font-family: var(--font-mono); font-size: 0.78rem; color: var(--muted); padding-top: 14px; border-top: 1px dashed var(--border); margin-bottom: 18px; }
.project-actions { display: flex; flex-wrap: wrap; gap: 10px; }

/* ===== Process ===== */
.step-card { height: 100%; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 22px; }
.step-num { font-family: var(--font-mono); font-size: 1.6rem; font-weight: 700; color: var(--accent); display: block; margin-bottom: 14px; }
.step-card h5 { font-size: 1.05rem; margin-bottom: 8px; }
.step-card p { color: var(--muted); font-size: 0.92rem; margin: 0; }

/* ===== Info / Mentorship ===== */
.info-card { height: 100%; text-align: center; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px 24px; }
.info-card i { font-size: 2rem; color: var(--accent); }
.info-card h5 { margin: 16px 0 8px; }
.info-card p { color: var(--muted); font-size: 0.94rem; margin: 0; }

/* ===== Education ===== */
.edu-card { display: flex; gap: 16px; align-items: flex-start; height: 100%; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.edu-card i { font-size: 1.6rem; color: var(--accent); margin-top: 2px; }
.edu-card h5 { font-size: 1.08rem; margin-bottom: 6px; }
.edu-card p { color: var(--muted); font-size: 0.92rem; margin: 0; }

/* ===== Contact ===== */
.contact-section { background: var(--bg-alt); }
.contact-box { background: var(--surface); border: 1px solid var(--border); border-radius: 24px; padding: 60px 32px; box-shadow: var(--shadow); }
.contact-links { display: flex; flex-wrap: wrap; gap: 22px; justify-content: center; margin-top: 22px; }
.contact-link { color: var(--text); font-weight: 500; display: inline-flex; align-items: center; gap: 8px; }
.contact-link i { color: var(--accent); }
.contact-link:hover { color: var(--accent); }

/* ===== Footer ===== */
.site-footer { background: var(--surface); border-top: 1px solid var(--border); padding: 28px 0; color: var(--muted); font-size: 0.9rem; }
.footer-meta { font-family: var(--font-mono); font-size: 0.78rem; }

/* ===== Modals ===== */
.modal-content { background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: 18px; }
.modal-header { border-bottom-color: var(--border); }
.modal-body h6 { color: var(--accent); font-family: var(--font-mono); text-transform: uppercase; letter-spacing: .08em; font-size: 0.8rem; margin-top: 20px; }
.modal-body h6:first-child { margin-top: 0; }
.modal-body p, .modal-body li { color: var(--muted); }
[data-theme="dark"] .btn-close { filter: invert(1) grayscale(1); }

/* ===== Back to top ===== */
.back-to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 90;
  width: 46px; height: 46px; border-radius: 12px; border: none;
  background: var(--accent); color: #06231d; display: grid; place-items: center;
  font-size: 1.2rem; box-shadow: var(--shadow);
  opacity: 0; pointer-events: none; transform: translateY(10px); transition: all .3s;
}
.back-to-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }

/* ===== Reveal animation ===== */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }

@media (max-width: 991px) {
  .site-nav { top: 0; }
  .navbar-collapse { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; margin-top: 12px; }
  .hero-card { margin: 0 auto; }
  .hero { padding-top: 140px; }
}