/* =========================================================
  Tejaswi Sonal — Portfolio
  - Dark/Light theme toggle
  - Accent color picker (hue)
  - Responsive layout + animation
========================================================= */

:root{
  /* Accent is controlled via --hue (0..360) */
  --hue: 270;
  --accent: hsl(var(--hue) 92% 62%);
  --accent-2: hsl(calc(var(--hue) + 70) 88% 55%);

  --bg: #0b1220;
  --panel: rgba(255,255,255,0.07);
  --panel-2: rgba(255,255,255,0.05);
  --text: rgba(255,255,255,0.92);
  --muted: rgba(255,255,255,0.70);
  --faint: rgba(255,255,255,0.55);
  --border: rgba(255,255,255,0.12);
  --shadow: 0 18px 40px rgba(0,0,0,0.35);
  --radius: 18px;
  --radius-sm: 14px;

  --container: min(1120px, calc(100% - 44px));
}

body.light{
  --bg: #f7f9ff;
  --panel: rgba(10,12,18,0.05);
  --panel-2: rgba(10,12,18,0.035);
  --text: rgba(8,10,16,0.92);
  --muted: rgba(8,10,16,0.70);
  --faint: rgba(8,10,16,0.55);
  --border: rgba(8,10,16,0.12);
  --shadow: 0 18px 40px rgba(15,20,30,0.12);
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background:
    radial-gradient(1000px 800px at 20% 10%, color-mix(in oklab, var(--accent) 28%, transparent), transparent 62%),
    radial-gradient(900px 700px at 85% 18%, color-mix(in oklab, var(--accent-2) 20%, transparent), transparent 58%),
    radial-gradient(800px 600px at 60% 85%, color-mix(in oklab, var(--accent) 10%, transparent), transparent 60%),
    var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

/* subtle noise overlay (pure CSS SVG) */
body::before{
  content:"";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.06;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)' opacity='.35'/%3E%3C/svg%3E");
}

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

.container{ width: var(--container); margin: 0 auto; }

.skip-link{
  position: absolute;
  left: -999px;
  top: 10px;
  padding: 10px 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.skip-link:focus{ left: 12px; z-index: 100; }

/* Scroll progress */
.scroll-progress{
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 200;
  background: transparent;
}
.scroll-progress__bar{
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 18px color-mix(in oklab, var(--accent) 35%, transparent);
}

/* Header */
.header{
  position: sticky;
  top: 0;
  z-index: 120;
  background: color-mix(in oklab, var(--bg) 72%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header__inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 0;
}
.brand{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  letter-spacing: 0.2px;
}
.brand__mark{
  width: 12px; height: 12px; border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 0 7px color-mix(in oklab, var(--accent) 18%, transparent);
}
.brand__text{ font-size: 15px; }

.nav{
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--muted);
  font-weight: 800;
}
.nav__link{
  padding: 9px 10px;
  border-radius: 12px;
  border: 1px solid transparent;
}
.nav__link:hover{
  text-decoration: none;
  background: var(--panel-2);
  border-color: var(--border);
}
.nav__link.active{
  text-decoration: none;
  color: var(--text);
  background: color-mix(in oklab, var(--accent) 14%, var(--panel-2));
  border-color: color-mix(in oklab, var(--accent) 36%, var(--border));
}

.header__actions{ display: flex; align-items: center; gap: 10px; }

/* Accent picker */
.accent{
  display: inline-flex;
  gap: 8px;
  padding: 6px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  border-radius: 999px;
}
.accent__btn{
  width: 12px; height: 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  cursor: pointer;
  opacity: 0.9;
}
.accent__btn[data-hue="270"]{ background: hsl(270 92% 62%); }
.accent__btn[data-hue="210"]{ background: hsl(210 92% 58%); }
.accent__btn[data-hue="170"]{ background: hsl(170 92% 45%); }
.accent__btn[data-hue="335"]{ background: hsl(335 92% 60%); }
.accent__btn.active{
  outline: 2px solid color-mix(in oklab, var(--accent) 55%, transparent);
  outline-offset: 2px;
}

/* Icon button */
.icon-btn{
  border: 1px solid var(--border);
  background: var(--panel-2);
  border-radius: 14px;
  width: 40px;
  height: 40px;
  display: inline-grid;
  place-items: center;
  cursor: pointer;
  box-shadow: 0 12px 30px rgba(0,0,0,0.10);
}
.icon-btn:hover{ background: color-mix(in oklab, var(--panel-2) 70%, var(--panel)); }
.icon{ display: block; }

/* Mobile menu */
.mobile-only{ display: none; }
.mobile-menu{
  border-top: 1px solid var(--border);
  padding: 10px 0 14px;
}
.mobile-menu__link{
  display: block;
  padding: 12px 0;
  color: var(--muted);
  font-weight: 900;
}
.mobile-menu__link:hover{ color: var(--text); text-decoration: none; }

/* Hero */
.hero{ padding: 54px 0 22px; }
.hero__grid{
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 18px;
  align-items: start;
}
.pill{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  border-radius: 999px;
  font-weight: 900;
  color: var(--muted);
  font-size: 12.5px;
}
.pill__dot{
  width: 8px; height: 8px; border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
h1{
  margin: 14px 0 10px;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.04;
  letter-spacing: -0.8px;
}
.accent-text{
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__subhead{ margin: 0; color: var(--muted); max-width: 70ch; }

.hero__cta{
  margin-top: 18px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.hero__links{
  margin-top: 18px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  max-width: 640px;
}

/* Cards & UI */
.card{
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}
.card.subtle{ background: var(--panel-2); }
.card--glow{
  background: linear-gradient(180deg, color-mix(in oklab, var(--accent) 14%, var(--panel)), var(--panel));
  border-color: color-mix(in oklab, var(--accent) 22%, var(--border));
}
.card__top{ margin-bottom: 10px; }
.card__title{ margin: 0; font-size: 18px; letter-spacing: -0.2px; }
.card__muted{ margin: 8px 0 0; color: var(--muted); }

.divider{
  height: 1px;
  background: var(--border);
  margin: 14px 0;
}

/* Chips */
.chips{ display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.chips--dense{ gap: 8px; }
.chip{
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid color-mix(in oklab, var(--border) 90%, transparent);
  background: color-mix(in oklab, var(--panel-2) 70%, transparent);
  color: var(--muted);
  font-weight: 900;
  font-size: 12.5px;
}
.list{ margin: 0; padding-left: 18px; color: var(--muted); }
.list li{ margin: 8px 0; }

.chip-link,
.chip-btn{
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  font-weight: 900;
  color: var(--muted);
}
.chip-link:hover,
.chip-btn:hover{
  text-decoration: none;
  background: color-mix(in oklab, var(--panel-2) 70%, var(--panel));
  color: var(--text);
}
.chip-link__value,
.chip-btn__value{ font-weight: 800; color: var(--text); opacity: 0.92; overflow: hidden; text-overflow: ellipsis; }
.chip-link__icon,
.chip-btn__icon{ opacity: 0.7; }

.chip-btn{
  cursor: pointer;
  text-align: left;
}

/* Buttons */
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 11px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  font-weight: 950;
  cursor: pointer;
  transition: transform .08s ease, background .15s ease;
}
.btn:hover{ text-decoration: none; background: color-mix(in oklab, var(--panel-2) 70%, var(--panel)); }
.btn:active{ transform: translateY(1px); }
.btn--primary{
  border-color: color-mix(in oklab, var(--accent) 38%, var(--border));
  background: linear-gradient(135deg,
    color-mix(in oklab, var(--accent) 24%, var(--panel-2)),
    color-mix(in oklab, var(--accent-2) 18%, var(--panel-2))
  );
}
.btn--ghost{
  background: transparent;
}
.btn--small{ padding: 9px 12px; border-radius: 12px; font-weight: 950; }

.mini-cta{ display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }

.tag{
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--muted);
  font-weight: 900;
  font-size: 12px;
}

/* Stats */
.stats{
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 10px;
}
.stat{
  padding: 14px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--panel-2);
}
.stat__num{
  font-size: 22px;
  font-weight: 1000;
  letter-spacing: -0.4px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat__label{ color: var(--muted); font-weight: 900; font-size: 12.5px; margin-top: 4px; }

/* Sections */
.section{ padding: 54px 0; }
.section--alt{
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: color-mix(in oklab, var(--panel-2) 40%, transparent);
}
.section__head h2{
  margin: 0;
  font-size: 28px;
  letter-spacing: -0.4px;
}
.section__head p{
  margin: 10px 0 0;
  color: var(--muted);
  max-width: 78ch;
}

.grid{
  margin-top: 18px;
  display: grid;
  gap: 14px;
}
.grid--2{ grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid--3{ grid-template-columns: repeat(3, minmax(0,1fr)); }

/* Bullets */
.bullets{ margin: 12px 0 0; padding-left: 18px; color: var(--muted); }
.bullets li{ margin: 8px 0; }

/* Callout */
.callout{
  margin-top: 16px;
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 12px;
  padding: 16px;
  border-radius: var(--radius);
  border: 1px dashed color-mix(in oklab, var(--accent) 26%, var(--border));
  background: color-mix(in oklab, var(--accent) 10%, var(--panel-2));
}
.callout__icon{
  width: 46px; height: 46px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  font-weight: 1000;
}
.callout__title{ margin: 0; }
.callout__text{ margin: 6px 0 0; color: var(--muted); }

/* Project cards */
.project{
  position: relative;
  overflow: hidden;
}
.project::before{
  content:"";
  position: absolute;
  inset: -1px;
  opacity: 0.0;
  background: radial-gradient(500px 220px at 20% 0%, color-mix(in oklab, var(--accent) 30%, transparent), transparent 65%);
  transition: opacity .18s ease;
}
.project:hover::before{ opacity: 1; }
.project__head{
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}
.project__title{ margin: 0; font-size: 18px; letter-spacing: -0.3px; }
.project__desc{ margin: 10px 0 0; color: var(--muted); }
.project__footer{
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 14px;
  gap: 10px;
  flex-wrap: wrap;
}
.project__actions{ display: flex; gap: 10px; flex-wrap: wrap; }
.project__meta{ color: var(--faint); font-weight: 900; font-size: 12px; }
.project__btn{
  display: inline-flex;
  gap: 8px;
  align-items: center;
  padding: 9px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  font-weight: 950;
  cursor: pointer;
}
.project__btn:hover{ text-decoration: none; background: color-mix(in oklab, var(--panel-2) 70%, var(--panel)); }
.project__btn:active{ transform: translateY(1px); }

.note{
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px dashed var(--border);
  background: var(--panel-2);
  color: var(--muted);
}
code{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.95em;
  color: color-mix(in oklab, var(--accent) 45%, var(--text));
}

/* Timeline */
.timeline{ position: relative; margin-top: 18px; }
.timeline__line{
  position: absolute;
  left: 14px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: color-mix(in oklab, var(--accent) 22%, var(--border));
  border-radius: 999px;
}
.timeline__item{
  position: relative;
  padding-left: 40px;
}
.timeline__dot{
  position: absolute;
  left: 8px;
  top: 24px;
  width: 14px; height: 14px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 0 7px color-mix(in oklab, var(--accent) 14%, transparent);
}
.timeline__top{
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

/* Education info row */
.info-row{
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 12px;
}
.info{
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  min-width: 160px;
}
.info__k{ color: var(--faint); font-weight: 950; font-size: 12px; }
.info__v{ color: var(--text); font-weight: 1000; }

/* Certifications list */
.checklist{
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}
.checklist li{
  margin: 10px 0;
  list-style: "✓  ";
}

/* Contact */
.contact .field{ margin-top: 12px; display: grid; gap: 8px; }
label{ font-weight: 950; color: var(--muted); font-size: 13px; }
input, textarea{
  width: 100%;
  background: color-mix(in oklab, var(--panel-2) 70%, transparent);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 14px;
  padding: 10px 12px;
  outline: none;
}
input:focus, textarea:focus{
  border-color: color-mix(in oklab, var(--accent) 55%, var(--border));
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent) 18%, transparent);
}

.contact__list{ display: grid; gap: 14px; margin-top: 12px; }
.contact__item{
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--panel-2);
}
.contact__k{ color: var(--faint); font-weight: 950; }
.contact__v{ display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.tiny-btn{
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-weight: 950;
  border-radius: 999px;
  padding: 7px 10px;
  cursor: pointer;
}
.tiny-btn:hover{ background: var(--panel); color: var(--text); }
.muted{ color: var(--muted); }
.tiny{ font-size: 12px; }

/* Footer */
.footer{
  padding: 26px 0 14px;
  border-top: 1px solid var(--border);
  background: color-mix(in oklab, var(--panel-2) 40%, transparent);
}
.footer__inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.footer__links{ display: inline-flex; gap: 14px; flex-wrap: wrap; }
.footer__link{ color: var(--muted); font-weight: 950; }
.footer__link:hover{ color: var(--text); text-decoration: none; }

/* Modal */
.modal::backdrop{
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(6px);
}
.modal{
  border: none;
  padding: 0;
  width: min(760px, calc(100% - 24px));
  background: transparent;
}
.modal__card{
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 75%, transparent);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 16px;
}
.modal__top{
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: start;
}
.modal__title{ margin: 0; }
.modal__meta{ margin: 6px 0 0; color: var(--muted); font-weight: 900; font-size: 12.5px; }
.modal__body{ margin-top: 12px; }
.modal__desc{ color: var(--muted); margin: 0 0 12px; }
.modal__section{ margin-top: 12px; }
.modal__section h4{ margin: 0 0 8px; }
.modal__actions{
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  flex-wrap: wrap;
  margin-top: 14px;
}

/* Toast */
.toast{
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 70%, transparent);
  color: var(--text);
  font-weight: 950;
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease;
  z-index: 220;
}
.toast.show{
  opacity: 1;
  transform: translateX(-50%) translateY(-2px);
}

/* Reveal animations */
.reveal{
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.visible{
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 980px){
  .hero__grid{ grid-template-columns: 1fr; }
  .stats{ grid-template-columns: 1fr; }
  .grid--3{ grid-template-columns: 1fr; }
}
@media (max-width: 820px){
  .nav{ display: none; }
  .mobile-only{ display: inline-grid; }
  .grid--2{ grid-template-columns: 1fr; }
}