/* ===== Design system =====
   Palette: "Analytics Dashboard" (blue data + amber highlights)
   Type: "Tech Startup" — Space Grotesk headings + DM Sans body
   Style: Motion-Driven + Minimalism (300–400ms, GPU transforms, reduced-motion safe)
*/
:root {
  --bg: hsl(222, 47%, 7%);
  --card-bg: hsl(221, 39%, 11%);
  --card-border: hsl(220, 30%, 20%);
  --surface: hsl(220, 32%, 15%);
  --text: hsl(210, 40%, 98%);
  --text-muted: hsl(214, 28%, 83%);
  --text-faint: hsl(215, 18%, 63%);
  --primary: hsl(213, 94%, 68%);          /* blue interactive */
  --accent: hsl(38, 92%, 50%);            /* amber CTA */
  --accent-contrast: hsl(222, 47%, 9%);
  --shadow: 0 16px 30px hsla(222, 47%, 4%, 0.35);
  --duration: 350ms;
}

[data-theme="light"] {
  --bg: hsl(210, 40%, 98%);
  --card-bg: hsl(0, 0%, 100%);
  --card-border: hsl(214, 88%, 92%);
  --surface: hsl(216, 41%, 94%);
  --text: hsl(224, 64%, 33%);
  --text-muted: hsl(224, 30%, 30%);
  --text-faint: hsl(215, 16%, 47%);
  --primary: hsl(224, 76%, 40%);
  --accent: hsl(32, 95%, 44%);
  --accent-contrast: hsl(0, 0%, 100%);
  --shadow: 0 16px 30px hsla(221, 60%, 60%, 0.14);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "DM Sans", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--duration), color var(--duration);
}

h1, h2, h3, h4, .nav-link, .btn, .filter-btn {
  font-family: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

ul, ol { list-style: none; }

/* ===== Inline icons ===== */
.ico {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: -0.22em;
}
.ico-sm { width: 16px; height: 16px; }
.title-ico { color: var(--primary); margin-right: 4px; }

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  transition: background var(--duration), border-color var(--duration);
}

/* ===== Layout ===== */
.layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ===== Sidebar ===== */
.sidebar { padding: 20px; }

.sidebar-info {
  display: flex;
  align-items: center;
  gap: 16px;
  position: relative;
}

.avatar-box img {
  border-radius: 24px;
  display: block;
  width: 84px;
  height: 84px;
  object-fit: cover;
}

.name { font-size: 1.15rem; font-weight: 600; letter-spacing: 0.2px; }

.title {
  display: inline-block;
  margin-top: 6px;
  padding: 3px 12px;
  font-size: 0.8rem;
  background: var(--surface);
  color: var(--primary);
  border-radius: 8px;
  font-weight: 600;
}

.subtitle { font-size: 0.78rem; color: var(--text-faint); margin-top: 4px; }

.sidebar-toggle {
  position: absolute;
  top: -20px;
  right: -20px;
  background: var(--surface);
  color: var(--primary);
  border: none;
  border-radius: 0 20px 0 20px;
  padding: 8px 12px;
  font-size: 0.75rem;
  cursor: pointer;
}
.sidebar-toggle .toggle-text { display: none; }
.sidebar-toggle .toggle-icon { width: 16px; height: 16px; transition: transform 0.3s; }
.sidebar-toggle[aria-expanded="true"] .toggle-icon { transform: rotate(180deg); }

.icon-box { color: var(--primary); }

.sidebar-more {
  display: none;
  margin-top: 16px;
}
.sidebar-more.open { display: block; }

.separator { border: none; border-top: 1px solid var(--card-border); margin: 16px 0; }

.contacts-list { display: flex; flex-direction: column; gap: 14px; }

.contact-item { display: flex; align-items: center; gap: 14px; min-width: 0; }

.icon-box {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  background: var(--surface);
  border-radius: 10px;
  font-size: 1.1rem;
}

.contact-info { min-width: 0; }
.contact-info a, .contact-info p:not(.contact-label) {
  font-size: 0.85rem;
  color: var(--text-muted);
  overflow-wrap: anywhere;
}
.contact-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-faint);
}

.lang-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }

.badge {
  display: inline-block;
  padding: 5px 12px;
  font-size: 0.78rem;
  background: var(--surface);
  color: var(--text-muted);
  border: 1px solid var(--card-border);
  border-radius: 999px;
}
.badge-ico { display: inline-flex; align-items: center; gap: 6px; }
.badge-ico .ico { width: 15px; height: 15px; color: var(--primary); }

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 11px 16px;
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: transform var(--duration), box-shadow var(--duration);
}
.btn + .btn, a.btn + .btn { margin-top: 10px; }

.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
}
a.btn-primary { text-decoration: none; }
a.btn-primary:hover { text-decoration: none; }

.btn-ghost {
  background: var(--surface);
  color: var(--text-muted);
  border: 1px solid var(--card-border);
  margin-top: 10px;
}

/* theme toggle shows the icon of the mode you'd switch to */
.theme-icon-moon { display: none; }
[data-theme="light"] .theme-icon-sun { display: none; }
[data-theme="light"] .theme-icon-moon { display: inline-block; }

.btn:hover { transform: translateY(-2px); box-shadow: 0 6px 16px hsla(222, 47%, 4%, 0.3); }

/* ===== Content card & navbar ===== */
.content { position: relative; padding: 24px; min-height: 60vh; }

.navbar {
  position: sticky;
  top: 0;
  z-index: 5;
  margin: -24px -24px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--card-border);
  border-radius: 20px 20px 0 0;
}

.navbar-list { display: flex; justify-content: center; gap: 4px; padding: 6px; flex-wrap: wrap; }

.nav-link {
  background: none;
  border: none;
  color: var(--text-faint);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 10px;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}
.nav-link:hover { color: var(--text); }
.nav-link.active { color: var(--primary); background: var(--card-bg); }

/* ===== Pages ===== */
.page { display: none; }
.page.active { display: block; }

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 6px;
  padding-bottom: 14px;
  position: relative;
}
.page-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 6px;
  width: 44px;
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

.section-title { font-size: 1.1rem; font-weight: 650; margin: 26px 0 14px; }

.about-text p { color: var(--text-muted); font-size: 0.95rem; margin-top: 12px; }

/* user preference: justified body text */
.about-text p,
.service-item p,
.project-card p,
.contact-hero p,
.timeline-item ul li {
  text-align: justify;
}

/* What I do */
.service-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.service-item {
  display: flex;
  gap: 14px;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  transition: transform var(--duration), box-shadow var(--duration);
}
.service-item:hover { transform: translateY(-3px); box-shadow: var(--shadow); }

.service-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  color: var(--primary);
}
.service-icon .ico { width: 22px; height: 22px; }
.service-item h4 { font-size: 0.98rem; margin-bottom: 4px; }
.service-item p { font-size: 0.85rem; color: var(--text-faint); }

/* Languages / creds */
.cred-list { display: grid; gap: 12px; }
.cred-item {
  padding: 14px 18px;
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: 14px;
}
.cred-item h4 { font-size: 0.95rem; }
.cred-item p { font-size: 0.85rem; color: var(--text-faint); }

.plain-list li {
  color: var(--text-muted);
  font-size: 0.9rem;
  padding-left: 18px;
  position: relative;
  margin-top: 8px;
}
.plain-list li::before { content: "▸"; position: absolute; left: 0; color: var(--primary); }

.hobby-list { display: flex; flex-wrap: wrap; gap: 8px; }

/* ===== Resume timeline ===== */
.timeline-list { position: relative; padding-left: 22px; }
.timeline-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--card-border);
}

.timeline-item { position: relative; margin-bottom: 22px; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -21px;
  top: 7px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 3px var(--surface);
}

.timeline-head { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 8px; }

.org-logo {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: hsl(0, 0%, 100%);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  overflow: hidden;
}
.org-logo img { width: 28px; height: 28px; object-fit: contain; }

.timeline-item h4 { font-size: 0.98rem; }
.timeline-date { display: block; font-size: 0.8rem; color: var(--primary); margin: 2px 0 8px; }
.timeline-item ul li {
  font-size: 0.88rem;
  color: var(--text-muted);
  padding-left: 16px;
  position: relative;
  margin-top: 5px;
}
.timeline-item ul li::before { content: "•"; position: absolute; left: 2px; color: var(--text-faint); }

/* Tech stack */
.tech-category { margin-bottom: 20px; }
.tech-category h4 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-faint);
  margin-bottom: 10px;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(108px, 1fr));
  gap: 10px;
}

.tech-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 14px 8px;
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  text-align: center;
  transition: transform var(--duration), box-shadow var(--duration), border-color var(--duration);
}
.tech-item:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--primary); }
.tech-item img { width: 32px; height: 32px; object-fit: contain; }
.tech-item .tech-ico { width: 32px; height: 32px; color: var(--primary); }
.tech-item span { font-size: 0.78rem; color: var(--text-muted); font-weight: 500; }

/* devicon GitHub mark is near-black — keep it visible on the dark theme */
:root:not([data-theme="light"]) .tech-item img[src*="github"] { filter: invert(1); }

/* ===== Portfolio ===== */
.filter-list { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0; }

.filter-btn {
  background: var(--surface);
  border: 1px solid var(--card-border);
  color: var(--text-faint);
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}
.filter-btn:hover { color: var(--text); }
.filter-btn.active { background: var(--primary); color: var(--card-bg); border-color: var(--primary); font-weight: 600; }

.project-list { display: grid; grid-template-columns: 1fr; gap: 16px; }

.project-item.hidden { display: none; }

.project-card {
  height: 100%;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  transition: transform var(--duration), box-shadow var(--duration);
}
.project-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }

.project-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--accent);
  margin-bottom: 8px;
}
.project-card h3 { font-size: 1.02rem; margin-bottom: 8px; }
.project-card p { font-size: 0.88rem; color: var(--text-muted); }
.project-stack { margin-top: 10px; font-size: 0.8rem !important; color: var(--text-faint) !important; }
.project-link { display: inline-block; margin-top: 10px; font-size: 0.88rem; font-weight: 600; }

/* ===== Contact ===== */
.contact-hero {
  margin-top: 16px;
  padding: 28px;
  border-radius: 16px;
  border: 1px solid var(--card-border);
  background:
    radial-gradient(120% 160% at 0% 0%, color-mix(in srgb, var(--primary) 16%, transparent) 0%, transparent 55%),
    radial-gradient(120% 160% at 100% 100%, color-mix(in srgb, var(--accent) 14%, transparent) 0%, transparent 55%),
    var(--surface);
}

.contact-hero h3 { font-size: 1.45rem; margin: 12px 0 10px; }
.contact-hero p { color: var(--text-muted); font-size: 0.95rem; max-width: 56ch; }

.avail-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 999px;
}
.avail-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: hsl(142, 71%, 45%);
  box-shadow: 0 0 0 3px hsla(142, 71%, 45%, 0.25);
}
@media (prefers-reduced-motion: no-preference) {
  .avail-dot { animation: pulse 2s ease-in-out infinite; }
}
@keyframes pulse {
  50% { box-shadow: 0 0 0 6px hsla(142, 71%, 45%, 0.12); }
}

.contact-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }

.contact-cards { display: grid; grid-template-columns: 1fr; gap: 14px; margin-top: 16px; }

.contact-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  color: var(--text);
  transition: transform var(--duration), box-shadow var(--duration), border-color var(--duration);
}
.contact-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--primary); text-decoration: none; }
.contact-card-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  color: var(--primary);
}
.contact-card-body { flex-grow: 1; min-width: 0; }
.contact-card strong { display: block; font-size: 0.95rem; }
.contact-card small { color: var(--text-faint); font-size: 0.82rem; overflow-wrap: anywhere; }
.contact-card-arrow { color: var(--text-faint); transition: transform 0.2s, color 0.2s; }
.contact-card:hover .contact-card-arrow { transform: translateX(3px); color: var(--primary); }

/* ===== Motion: scroll-triggered reveals (Intersection Observer adds .in-view) ===== */
.page.active { animation: page-fade var(--duration) ease both; }

.reveal {
  opacity: 0;
  transform: translateY(16px);
}
.reveal.in-view {
  opacity: 1;
  transform: none;
  transition: opacity 400ms ease, transform 400ms ease;
  transition-delay: var(--reveal-delay, 0ms);
}

@keyframes page-fade {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .page.active { animation: none; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

/* ===== Responsive ===== */
@media (min-width: 580px) {
  .service-list { grid-template-columns: 1fr 1fr; }
  .contact-cards { grid-template-columns: 1fr 1fr 1fr; }
  .cred-list { grid-template-columns: 1fr 1fr 1fr; }
  .project-list { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 1024px) {
  .layout {
    flex-direction: row;
    align-items: flex-start;
    padding: 40px 24px;
  }

  .sidebar {
    position: sticky;
    top: 40px;
    width: 300px;
    flex-shrink: 0;
    padding: 28px;
  }

  .sidebar-info { flex-direction: column; text-align: center; }
  .avatar-box img { width: 130px; height: 130px; border-radius: 28px; }
  .info-content { display: flex; flex-direction: column; align-items: center; }
  .sidebar-toggle { display: none; }
  .sidebar-more { display: block; }

  .content { flex-grow: 1; padding: 32px; min-width: 0; }

  .navbar {
    position: absolute;
    top: 0;
    right: 0;
    left: auto;
    margin: 0;
    width: auto;
    border-radius: 0 20px 0 20px;
    border-left: 1px solid var(--card-border);
  }
  .navbar-list { padding: 4px 8px; }
  .page header { padding-right: 360px; min-height: 48px; }
}