* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  text-decoration: none;
  list-style: none;
  scroll-behavior: smooth;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}
:root {
  --background: #0f0f10;
  --second-background: #17181a;
  --text: #ffffff;
  --muted: #b4b6bc;
  --primary: #22d3ee; /* brighter cyan for dark theme */
  --primary-contrast: #061317;
  --border: rgba(255,255,255,0.08);
  --radius: 14px;
  --shadow: 0 8px 24px rgba(0,0,0,0.35);
  --container-max: 1120px;
  --space-1: .25rem; --space-2: .5rem; --space-3: .75rem; --space-4: 1rem; --space-5: 1.5rem; --space-6: 2rem; --space-7: 3rem; --space-8: 4rem;
}

[data-theme="light"] {
  --background: #ffffff;
  --second-background: #f8fafc; /* brighter surface */
  --text: #0f172a; /* darker text for contrast */
  --muted: #475569; /* slightly brighter muted */
  --primary: #0ea5e9; /* bright sky */
  --primary-contrast: #ffffff;
  --chip-bg: rgba(0,0,0,0.06);
  --border: rgba(0,0,0,0.08);
  --shadow: 0 8px 24px rgba(0,0,0,0.08);
}
body{
  min-height: 100vh;
  background-color: var(--background);
  color: var(--text);
  padding-top: 72px; /* offset fixed nav */

}
/* Animated background blobs */
.bg{ position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.bg .blob{ position: absolute; width: 40vw; height: 40vw; border-radius: 50%; filter: blur(48px); opacity: 0.15; will-change: transform; }
.bg .b1{ background: radial-gradient(circle at 30% 30%, #0ea5e9 0%, transparent 60%); top: -10vh; left: -5vw; animation: float-1 18s ease-in-out infinite alternate; }
.bg .b2{ background: radial-gradient(circle at 70% 40%, #22d3ee 0%, transparent 60%); top: 10vh; right: -10vw; animation: float-2 22s ease-in-out infinite alternate; }
.bg .b3{ background: radial-gradient(circle at 40% 60%, #f97316 0%, transparent 60%); bottom: -15vh; left: 10vw; animation: float-3 26s ease-in-out infinite alternate; }
.bg .b4{ background: radial-gradient(circle at 60% 70%, #6366f1 0%, transparent 60%); bottom: -20vh; right: 0; animation: float-4 30s ease-in-out infinite alternate; }
@keyframes float-1{ from{ transform: translate(0,0); } to{ transform: translate(4vw, 3vh) scale(1.05); } }
@keyframes float-2{ from{ transform: translate(0,0); } to{ transform: translate(-3vw, 2vh) scale(1.08); } }
@keyframes float-3{ from{ transform: translate(0,0); } to{ transform: translate(2vw, -3vh) scale(1.04); } }
@keyframes float-4{ from{ transform: translate(0,0); } to{ transform: translate(-2vw, -2vh) scale(1.06); } }
/* Layout helpers */
.container{ max-width: var(--container-max); margin: 0 auto; padding: 0 16px; }
.two-col{ display: grid; grid-template-columns: 1.2fr 1fr; gap: var(--space-6); align-items: start; }
.center{ text-align: center; }
@media (max-width: 900px){ .two-col{ grid-template-columns: 1fr; } }
nav{
  position: fixed;
  top: 0;
  width: 100%;
  padding: 1rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: rgba(15, 15, 15, 0.8) ;
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--border);
}
/* Light theme translucent nav */
[data-theme="light"] nav{ background-color: rgba(255,255,255,0.8); }
nav .nav-inner{ display: flex; align-items: center; justify-content: space-between; width: 100%; }
ul{
  display: flex;
  align-items: center;
  gap: 2rem;
}
nav ul a{
  color:var(--text);
  opacity: 0.7;
  transition: 0.2s ease-in-out;
}nav ul a:hover{
  opacity: 1; text-decoration: underline; text-underline-offset: 4px;
}
/* Gradient underline flair */
nav ul a{ position: relative; }
nav ul a::after{
  content: ""; position: absolute; left: 0; bottom: -4px; height: 2px; width: 0; background: linear-gradient(90deg, var(--primary), #f97316); transition: width .25s ease; }
nav ul a:hover::after{ width: 100%; }
.icon-btn{
  background: transparent;
  border: 0;
  color: var(--text);
  font-size: 1.75rem;
  cursor: pointer;
}
.logo{
  color: var(--text);
  font-size: 1.25rem;
  font-weight: 700;
  opacity: 0.8;
  transition: 0.2s ease-in-out;
}
.logo:hover{
  opacity: 1;
}
.btn{
  padding: .6rem 1rem;
  color: var(--text);
  letter-spacing: 0.2px;
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: 0.3s ease-in-out;
  border-radius: 999px;
  background: transparent;
}
.btn:hover{
  background-color: var(--second-background);
}
.btn-primary{ background: var(--primary); color: var(--primary-contrast); border-color: transparent; }
.btn-primary:hover{ filter: brightness(1.05); transform: translateY(-1px); }
h1{ font-size: clamp(2rem, 1.2rem + 2.5vw, 3rem); line-height: 1.15; }
h2{ font-size: 1.75rem; }
.lead{ color: var(--muted); max-width: 65ch; }
.eyebrow{ text-transform: uppercase; letter-spacing: .12em; font-size: .8rem; color: var(--muted); }
/* Smooth theme transitions for key surfaces */
body, nav, section, .card, .btn, .chip { transition: background-color .25s ease, color .25s ease, border-color .25s ease; }
section{
  min-height: auto;
  padding: var(--space-8) 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2em;
  color: var(--text);

}
section h2{
  font-size: 2.25rem;
  margin-bottom: 0.5em;
}
.hero{
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2em;
  color: var(--text);

}
.hero-grid{ display: grid; grid-template-columns: 1.4fr 1fr; gap: var(--space-7); align-items: center; }
.hero-text{ max-width: 65ch; }
.hero h1{ background: linear-gradient(90deg, var(--text) 0%, var(--primary) 50%, var(--text) 100%); background-clip: text; -webkit-background-clip: text; color: transparent; background-size: 200% 100%; animation: headline-shift 8s ease-in-out infinite; }
@keyframes headline-shift{ 0%,100%{ background-position: 0% 50%; } 50%{ background-position: 100% 50%; } }
.theme-toggle-hero{ margin-top: .75rem; }
.switch{
  position: relative;
  display: inline-flex;
  align-items: center;
  width: min(360px, 90vw);
  height: 44px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--second-background);
  cursor: pointer;
  overflow: hidden;
}
.switch .switch-label{
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  font-weight: 600;
  font-size: .92rem;
}
.switch .day{ color: var(--muted); }
.switch .night{ color: var(--muted); }
.switch .thumb{
  position: absolute;
  top: 3px; left: 3px;
  width: calc(50% - 6px);
  height: calc(100% - 6px);
  border-radius: 999px;
  background: var(--primary);
  box-shadow: var(--shadow);
  transition: transform .25s ease;
}
.switch.on .thumb{ transform: translateX(100%); }
.switch.on .night{ color: var(--primary-contrast); }
.switch:not(.on) .day{ color: var(--primary-contrast); }
/* Light theme variant */
[data-theme="light"] .switch{ background: #eaf2f8; }
[data-theme="light"] .switch .thumb{ background: var(--primary); }
.hero-media{ position: relative; }
.hero-media .avatar{ width: 260px; height: 260px; border-radius: 50%; object-fit: cover; box-shadow: var(--shadow); border: 4px solid var(--second-background); position: relative; z-index: 1; }
/* Removed rotating conic-gradient ring behind avatar */
@media (max-width: 900px){ .hero-grid{ grid-template-columns: 1fr; } .hero-media{ order:-1; } .hero-media .avatar{ width: 200px; height: 200px; } }
::-webkit-scrollbar{
  width: 20px;
  background-color: var(--background);
}
::-webkit-scrollbar-thumb{
  background: linear-gradient(to bottom, #0ea5e9, #f97316);
}

/* Footer */
.site-footer{
  padding: var(--space-6) 0;
  color: var(--muted);
}

/* Chips and filters */
.filters{
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1rem;
}
.filters-row{ display: grid; gap: 1rem; align-items: start; }
.skills-filter{ display: none; }
.chip{
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  padding: .4rem .75rem;
  border-radius: 999px;
  background: var(--chip-bg);
  color: var(--text);
  border: 1px solid var(--border);
  cursor: pointer;
  font-size: .9rem;
  transition: transform .15s ease, background-color .2s ease, color .2s ease, border-color .2s ease;
}
.chip:active{ transform: scale(.98); }
.chip.active{
  background: var(--primary);
  color: var(--primary-contrast);
  border-color: transparent;
}
.filter-actions{ margin-top: .25rem; }

/* Project grid */
.grid.cards{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

/* Projects table */
.table-wrapper{ border: 1px solid var(--border); border-radius: 12px; overflow: auto; background: var(--second-background); max-height: 520px; box-shadow: var(--shadow); }
.projects-table{ width: 100%; border-collapse: separate; border-spacing: 0; min-width: 680px; }
.projects-table thead th{ position: sticky; top: 0; background: var(--second-background); z-index: 2; text-align: left; font-weight: 700; color: var(--muted); padding: .75rem 1rem; border-bottom: 1px solid var(--border); }
.projects-table thead th.sortable{ cursor: pointer; }
.projects-table thead th.sortable[aria-sort="asc"]::after{ content: ' \25B2'; color: var(--muted); }
.projects-table thead th.sortable[aria-sort="desc"]::after{ content: ' \25BC'; color: var(--muted); }
.filters-meta{ display: flex; justify-content: flex-end; margin: .25rem 0 1rem; color: var(--muted); font-size: .9rem; }
.projects-table tbody td{ padding: .75rem 1rem; border-bottom: 1px solid var(--border); vertical-align: top; }
.projects-table tbody tr{ transition: background-color .2s ease; }
.projects-table tbody tr:hover{ background: rgba(255,255,255,0.03); }
[data-theme="light"] .projects-table tbody tr:hover{ background: rgba(0,0,0,0.03); }
.projects-table .proj-title{ font-weight: 600; }
.projects-table .proj-cats{ display: inline-flex; flex-wrap: wrap; gap: .25rem; }
.projects-table .proj-cats .chip{ font-size: .75rem; padding: .2rem .5rem; }
.projects-table .proj-skills{ display: inline-flex; flex-wrap: wrap; gap: .25rem; }
.projects-table .proj-skills .chip{ font-size: .75rem; padding: .2rem .5rem; }

/* Unified layout with skills sidebar */
.projects-layout{ display: grid; grid-template-columns: 1fr 280px; gap: 1rem; align-items: start; }
@media (max-width: 900px){ .projects-layout{ grid-template-columns: 1fr; } }
.skills-panel{ position: sticky; top: 84px; align-self: start; border: 1px solid var(--border); border-radius: 12px; background: var(--second-background); box-shadow: var(--shadow); overflow: hidden; }
.skills-panel-header{ display: flex; align-items: center; justify-content: space-between; gap: .5rem; padding: .75rem 1rem; border-bottom: 1px solid var(--border); }
.skills-panel-header h3{ margin: 0; font-size: 1rem; }
.skills-actions{ display: inline-flex; gap: .5rem; }
.skills-table-wrapper{ max-height: 420px; overflow: auto; }
.skills-table{ width: 100%; border-collapse: separate; border-spacing: 0; }
.skills-table thead th{ position: sticky; top: 0; background: var(--second-background); z-index: 1; text-align: left; font-weight: 700; color: var(--muted); padding: .5rem .75rem; border-bottom: 1px solid var(--border); }
.skills-table tbody td{ padding: .5rem .75rem; border-bottom: 1px solid var(--border); }
.skills-table tbody tr:hover{ background: rgba(255,255,255,0.03); }
[data-theme="light"] .skills-table tbody tr:hover{ background: rgba(0,0,0,0.03); }

/* Rounded, thin scrollbars inside scrollable boxes */
.table-wrapper,
.skills-table-wrapper{ scrollbar-width: thin; scrollbar-color: var(--primary) transparent; }
.table-wrapper::-webkit-scrollbar,
.skills-table-wrapper::-webkit-scrollbar{ height: 10px; width: 10px; }
.table-wrapper::-webkit-scrollbar-track,
.skills-table-wrapper::-webkit-scrollbar-track{ background: transparent; border-radius: 999px; }
.table-wrapper::-webkit-scrollbar-thumb,
.skills-table-wrapper::-webkit-scrollbar-thumb{ background: linear-gradient(90deg, var(--primary), #f97316); border-radius: 999px; }
.card{
  background: var(--second-background);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  transition: transform .2s ease, box-shadow .2s ease;
}
.card:hover{ transform: translateY(-2px); box-shadow: var(--shadow); }
.card.compact{ padding: .75rem; }
.ticks{ display: grid; gap: .5rem; color: var(--muted); }
.ticks li{ position: relative; padding-left: 1.25rem; }
.ticks li::before{ content: '\2713'; position: absolute; left: 0; color: var(--primary); }
.chips{ display:flex; flex-wrap: wrap; gap: .5rem; }
.card h3{font-size: 1.25rem; margin-bottom: .5rem;}
.card p{color: var(--muted);}
.card .tags{margin-top: .75rem; display:flex; gap:.5rem; flex-wrap:wrap}
.card .tags .chip{font-size: .8rem; padding: .25rem .6rem}

/* Timeline */
.timeline{ display: grid; gap: .75rem; }
.timeline-item{ display: grid; grid-template-columns: 80px 1fr; gap: 1rem; align-items: start; }
.timeline-item time{ color: var(--muted); font-weight: 600; }
@media (max-width: 600px){ .timeline-item{ grid-template-columns: 70px 1fr; } }

/* Scroll reveal */
.reveal-on-scroll{opacity: 0; transform: translateY(12px); transition: opacity .5s ease, transform .5s ease;}
.reveal-on-scroll.revealed{opacity: 1; transform: translateY(0);}
/* Data-driven animation variants */
[data-animate]{ opacity: 0; transform: translateY(12px); transition: opacity .6s cubic-bezier(.2,.8,.2,1), transform .6s cubic-bezier(.2,.8,.2,1); }
[data-animate].in-view{ opacity: 1; transform: none; }
[data-animate="fade-in"]{ transform: none; opacity: 0; }
[data-animate="fade-in"].in-view{ opacity: 1; }
[data-animate="scale-in"]{ transform: scale(.96); }
[data-animate="slide-left"]{ transform: translateX(-12px); }
[data-animate="slide-right"]{ transform: translateX(12px); }

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{ animation: none !important; transition: none !important; }
}

/* Mobile nav */
@media (max-width: 800px){
  nav{
    padding: .75rem 0;
  }
  nav .links{
    display: none;
  }
  nav .links.open{
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 66px;
    right: 16px;
    background-color: rgba(15,15,15,0.95);
    border: 1px solid var(--border);
    padding: 1rem;
    border-radius: 10px;
    gap: 1rem;
  }
}
/* Light theme mobile menu surface override */
@media (max-width: 800px){
  [data-theme="light"] nav .links.open{
    background-color: rgba(255,255,255,0.98);
    border: 1px solid rgba(0,0,0,0.1);
  }
}

/* Scroll progress bar */
.scroll-progress{
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: linear-gradient(90deg, var(--primary), #f97316);
  z-index: 1200;
}

/* Card tilt enhancement on desktop */
@media (hover: hover) and (pointer: fine){
  .card{ will-change: transform; transform-style: preserve-3d; }
}