/* Theme variables (default = dark) */
:root{
  --bg: #0f1112;
  --panel: #141516;
  --surface: #1e1e1e;
  --text: #eaeaea;
  --muted: #9aa0a6;
  --accent: #00ffd5;
  --accent2: #00f7ff;
  --btn-bg: rgba(255,255,255,0.03);
  --btn-border: rgba(255,255,255,0.06);
  --shadow: rgba(0,0,0,0.5);
}

/* Light theme */
body.light-mode {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --surface: #ffffff;
  --text: #111111;
  --muted: #55595f;
  --accent: #0077cc;
  --accent2: #005fa3;
  --btn-bg: rgba(0,0,0,0.04);
  --btn-border: rgba(0,0,0,0.06);
  --shadow: rgba(0,0,0,0.08);
}

/* respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

/* smooth transitions */
* { box-sizing: border-box; transition: background-color 300ms ease, color 300ms ease, border-color 300ms ease, transform 200ms ease; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* Header */
header {
  background: var(--surface);
  text-align: center;
  padding: 36px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.02);
}
header h1 { margin: 0 0 6px 0; font-size: 2.2rem; color: var(--accent2); }
header p { margin: 0; color: var(--muted); }

/* Layout */
main { max-width: 920px; margin: 28px auto; padding: 0 18px; }
section { padding: 24px 0; border-bottom: 1px dashed rgba(255,255,255,0.02); }
h2 { margin: 0 0 12px 0; color: var(--accent); border-bottom: 2px solid transparent; padding-bottom: 6px; }

/* Cards/list */
.project, ul li {
  background: var(--panel);
  color: var(--text);
  padding: 14px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.02);
}

/* Links & highlights */
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.highlight-name { color: var(--accent2); font-weight: 700; }
.highlight-skill { color: var(--accent); font-weight: 700; }

/* Skills ring */
.skills-container { display:flex; gap:18px; flex-wrap:wrap; justify-content:center; }
.skill { text-align:center; min-width:80px; }
.ring-bg, .ring-fill { fill:none; stroke-width:10; }
.ring-bg { stroke: rgba(255,255,255,0.06); }
.ring-fill { stroke: var(--accent); transition: stroke-dashoffset 1s ease-out, stroke 300ms; transform-origin: 60px 60px; }
.ring-text { fill: var(--text); font-size:18px; text-anchor:middle; dominant-baseline:middle; transform: none; transform-origin: 60px 60px; }

/* Contact */
#contact { text-align:center; }
.contact-links { display:inline-flex; gap:18px; align-items:center; }
.email-icon, .fb-icon { width:30px; height:30px; }

/* Theme toggle button */
.theme-toggle-btn {
  position: fixed;
  top: 14px;
  right: 14px;
  z-index: 1200;
  background: var(--btn-bg);
  color: var(--text);
  border: 1px solid var(--btn-border);
  padding: 8px 10px;
  border-radius: 10px;
  font-size: 1.05rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px var(--shadow);
}
.theme-toggle-btn:focus { outline: 3px solid rgba(0,0,0,0.06); outline-offset: 2px; }
.toggle-icon { display:inline-block; transform-origin:center; transition: transform 260ms cubic-bezier(.2,.9,.3,1); }
.theme-toggle-btn.btn-anim .toggle-icon { transform: rotate(-20deg) scale(1.05); }

/* Scroll top button */
.fixed-scroll-top {
  position: fixed;
  bottom: 18px;
  right: 18px;
  z-index: 1100;
  background: var(--panel);
  color: var(--accent);
  border: none;
  width:44px;
  height:44px;
  border-radius:50%;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  box-shadow: 0 8px 18px rgba(0,0,0,0.25);
  opacity: 0;
  transition: opacity 260ms ease;
  cursor: pointer;
}
.fixed-scroll-top:hover { transform: translateY(-3px); }

/* Footer */
footer { text-align:center; padding:18px; color:var(--muted); background:transparent; }

/* Responsive */
@media (max-width:600px) {
  header h1 { font-size:1.5rem; }
  .skills-container { gap:12px; }
}