/* ============================================================
   Tushar Gupta — Portfolio
   Design language: event log / terminal / distributed systems
   ============================================================ */

:root {
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Menlo, monospace;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 0.6s;

  --mx: 50%;
  --my: 30%;
}

/* ---------- THEME: DARK (default) ---------- */
[data-theme="dark"] {
  --bg: #090c10;
  --bg-soft: #0d1117;
  --surface: rgba(255, 255, 255, 0.045);
  --surface-strong: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #e9edf2;
  --text-dim: #8b96a3;
  --text-faint: #5a6572;

  --accent: #7dd3fc;
  --accent-strong: #38bdf8;
  --accent-2: #fcd34d;
  --accent-3: #a5f3a5;
  --accent-pink: #f9a8d4;

  --glow-1: rgba(125, 211, 252, 0.16);
  --glow-2: rgba(165, 243, 165, 0.10);

  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

/* ---------- THEME: LIGHT ---------- */
[data-theme="light"] {
  --bg: #f3f5f7;
  --bg-soft: #ffffff;
  --surface: rgba(255, 255, 255, 0.6);
  --surface-strong: rgba(255, 255, 255, 0.85);
  --border: rgba(15, 23, 32, 0.09);
  --border-strong: rgba(15, 23, 32, 0.16);
  --text: #10151b;
  --text-dim: #4b5762;
  --text-faint: #7c8894;

  --accent: #0284c7;
  --accent-strong: #0369a1;
  --accent-2: #b45309;
  --accent-3: #15803d;
  --accent-pink: #be185d;

  --glow-1: rgba(2, 132, 199, 0.10);
  --glow-2: rgba(21, 128, 61, 0.08);

  --shadow: 0 20px 50px -25px rgba(15, 23, 42, 0.25);
  color-scheme: light;
}

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

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

img { display: block; max-width: 100%; }

::selection { background: var(--accent); color: #06121a; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- BACKGROUND FIELD ---------- */
.bg-field {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-glow {
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(600px circle at var(--mx) var(--my), var(--glow-1), transparent 60%),
    radial-gradient(500px circle at calc(100% - var(--mx)) calc(100% - var(--my)), var(--glow-2), transparent 55%);
  transition: background 0.4s ease-out;
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 90%);
}

.noise {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

/* ---------- GLASS ---------- */
.glass {
  background: var(--surface);
  border: 1px solid var(--border);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease), background var(--dur) var(--ease);
}

/* ---------- NAV ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.4rem clamp(1.25rem, 5vw, 4rem);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 55%, transparent);
  border-bottom: 1px solid transparent;
}

.nav-mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}
.nav-mark-dot { color: var(--accent); }

.nav-links {
  display: flex;
  gap: clamp(1rem, 3vw, 2rem);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-dim);
}
.nav-links a { position: relative; padding: 0.2rem 0; transition: color 0.25s ease; }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width 0.3s var(--ease);
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }

@media (max-width: 640px) {
  .nav-links { display: none; }
}

.theme-toggle {
  position: relative;
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: border-color 0.3s ease, transform 0.3s ease;
}
.theme-toggle:hover { transform: rotate(15deg); border-color: var(--border-strong); }
.theme-toggle svg { width: 18px; height: 18px; position: absolute; transition: opacity 0.3s ease, transform 0.4s ease; }
.icon-moon { opacity: 1; transform: scale(1); }
.icon-sun { opacity: 0; transform: scale(0.5) rotate(-90deg); }
[data-theme="light"] .icon-moon { opacity: 0; transform: scale(0.5) rotate(90deg); }
[data-theme="light"] .icon-sun { opacity: 1; transform: scale(1) rotate(0); }

/* ---------- LAYOUT SHELL ---------- */
main { position: relative; z-index: 2; }

.section {
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(4rem, 10vw, 7rem) clamp(1.25rem, 5vw, 2rem);
}
.section-tight { padding-top: clamp(1rem, 4vw, 2rem); }

.section-head { margin-bottom: clamp(2rem, 5vw, 3rem); }
.section-head h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  letter-spacing: -0.01em;
  max-width: 24ch;
}
.section-note { margin-top: 0.5rem; color: var(--text-faint); font-family: var(--font-mono); font-size: 0.85rem; }

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--accent);
  text-transform: lowercase;
  margin-bottom: 0.9rem;
}

/* ---------- HERO ---------- */
.hero {
  position: relative;
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4rem) clamp(1.25rem, 5vw, 2rem) clamp(4rem, 8vw, 6rem);
  display: flex;
  flex-direction: column;
  gap: clamp(2.5rem, 6vw, 4rem);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}

@media (max-width: 820px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-portrait { order: -1; max-width: 220px; margin: 0 auto; }
}

.hero-heading {
  max-width: 46rem;
}
.eyebrow {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  margin-bottom: 0.9rem;
}
.headline {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.6rem, 8vw, 5rem);
  letter-spacing: -0.02em;
  line-height: 1.02;
  margin-bottom: 1.1rem;
}
.sub {
  color: var(--text-dim);
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  max-width: 42ch;
  margin-bottom: 1.8rem;
}

.hero-cta { display: flex; gap: 0.9rem; flex-wrap: wrap; }

.btn {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.85rem 1.5rem;
  border-radius: 999px;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s ease, background 0.25s ease;
}
.btn-primary {
  background: var(--accent);
  color: #06121a;
  font-weight: 600;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px -10px var(--accent); }
.btn-ghost {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--border-strong); transform: translateY(-2px); }

/* ---------- PORTRAIT ---------- */
.hero-portrait {
  position: relative;
  width: min(280px, 60vw);
  aspect-ratio: 1;
  justify-self: center;
}
.portrait-ring {
  position: absolute;
  inset: -10px;
  border-radius: 28px;
  background: conic-gradient(from 0deg, var(--accent), var(--accent-3), var(--accent-pink), var(--accent));
  filter: blur(2px);
  opacity: 0.55;
  animation: spin 10s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.portrait-img {
  position: relative;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 24px;
  border: 1px solid var(--border-strong);
}

.status-chip {
  position: absolute;
  bottom: -14px;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-dim);
}
.status-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent-3);
  box-shadow: 0 0 8px var(--accent-3);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

/* ---------- SCROLL CUE ---------- */
.scroll-cue {
  align-self: center;
  width: 24px; height: 40px;
  border: 1.5px solid var(--border-strong);
  border-radius: 14px;
  display: flex;
  justify-content: center;
  padding-top: 7px;
  opacity: 0.6;
  transition: opacity 0.3s ease;
}
.scroll-cue:hover { opacity: 1; }
.scroll-cue span {
  width: 3px; height: 8px;
  border-radius: 2px;
  background: var(--accent);
  animation: scrollDown 1.6s ease-in-out infinite;
}
@keyframes scrollDown {
  0% { transform: translateY(0); opacity: 1; }
  70% { transform: translateY(10px); opacity: 0; }
  100% { opacity: 0; }
}

/* ---------- TERMINAL ---------- */
.terminal {
  padding: 0;
  overflow: hidden;
  font-family: var(--font-mono);
}
.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface-strong);
}
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-r { background: #ff5f57; }
.dot-y { background: #febc2e; }
.dot-g { background: #28c840; }
.terminal-title {
  margin-left: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-faint);
}
.terminal-body {
  padding: 1.3rem 1.4rem 1.6rem;
  font-size: 0.88rem;
  min-height: 210px;
}
.terminal-body .line { color: var(--text-dim); margin-top: 0.7rem; }
.terminal-body .line:first-child { margin-top: 0; }
.terminal-body .prompt { color: var(--accent-3); margin-right: 0.4rem; }
.terminal-body .cmd { color: var(--text); }
.terminal-body .out {
  color: var(--accent);
  margin-top: 0.25rem;
  padding-left: 1.3rem;
}
.out-name { font-weight: 600; font-size: 1.05rem; color: var(--text); }
.cursor {
  display: inline-block;
  color: var(--accent-2);
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* stack terminal grid */
.stack-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0;
  border-bottom: 1px dashed var(--border);
  font-size: 0.86rem;
}
.stack-row:last-child { border-bottom: none; }
.stack-name { color: var(--text); }
.stack-name::before { content: "▸ "; color: var(--accent-3); }
.stack-version { color: var(--text-faint); }
.stack-tag {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  padding: 0.1rem 0.55rem;
  border-radius: 999px;
  font-size: 0.72rem;
}

/* ---------- ABOUT ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: stretch;
}
@media (max-width: 760px) { .about-grid { grid-template-columns: 1fr; } }

.about-text {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  line-height: 1.65;
  color: var(--text-dim);
  align-self: center;
}

.about-facts {
  padding: 1.6rem;
  display: flex;
  flex-direction: column;
  gap: 1.3rem;
  justify-content: center;
}
.fact { display: flex; flex-direction: column; gap: 0.2rem; }
.fact-num {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--accent);
}
.fact-label { font-size: 0.85rem; color: var(--text-faint); font-family: var(--font-mono); }

/* ---------- LOG STREAM ---------- */
.log-stream {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.log-entry {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1.4rem;
  padding: 1.5rem 1.6rem;
}
@media (max-width: 640px) {
  .log-entry { grid-template-columns: 1fr; gap: 0.6rem; }
  .log-offset { flex-direction: row !important; align-items: center; gap: 0.6rem; }
  .offset-line { display: none; }
}

.log-entry:hover { border-color: var(--border-strong); transform: translateY(-2px); }

.log-offset {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
}
.offset-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  white-space: nowrap;
}
.offset-line {
  width: 1px;
  flex: 1;
  background: var(--border);
  margin-left: 0.6rem;
}

.log-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  margin-bottom: 0.3rem;
}
.log-meta h3 { font-family: var(--font-display); font-size: 1.15rem; font-weight: 600; }
.log-time { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-faint); }
.log-org { color: var(--accent-3); font-size: 0.92rem; margin-bottom: 0.6rem; font-family: var(--font-mono); }
.log-desc { color: var(--text-dim); font-size: 0.96rem; line-height: 1.55; margin-bottom: 0.9rem; }

.log-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.log-tags span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
}

/* ---------- ACHIEVEMENT CARDS ---------- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.2rem;
}

.card {
  padding: 1.6rem;
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease), border-color 0.3s ease, box-shadow 0.3s ease;
}
.card.in-view { opacity: 1; transform: translateY(0); }

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(160px circle at 20% 0%, var(--card-accent), transparent 70%);
  opacity: 0.14;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.card:hover { transform: translateY(-6px); border-color: var(--border-strong); box-shadow: 0 20px 40px -20px var(--card-accent); }
.card:hover::before { opacity: 0.26; }

.card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.card-icon { color: var(--card-accent); font-size: 1rem; }
.card-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--card-accent);
  border: 1px solid color-mix(in srgb, var(--card-accent) 40%, transparent);
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
}
.card h3 { font-family: var(--font-display); font-size: 1.15rem; margin-bottom: 0.5rem; }
.card p { color: var(--text-dim); font-size: 0.92rem; line-height: 1.5; }
.card p a { color: var(--card-accent); border-bottom: 1px solid currentColor; }

/* ---------- EDUCATION ---------- */
.edu-card {
  padding: 1.8rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.edu-main h3 { font-family: var(--font-display); font-size: 1.15rem; margin-bottom: 0.3rem; }
.edu-main p { color: var(--text-dim); font-size: 0.92rem; }
.edu-side {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-faint);
}
.edu-grade { color: var(--accent); }

/* ---------- CONTACT ---------- */
.contact-section { padding-bottom: clamp(3rem, 8vw, 5rem); }
.contact-card {
  padding: clamp(2rem, 6vw, 3.5rem);
  text-align: center;
}
.contact-card h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  margin: 0.6rem 0 0.8rem;
}
.contact-sub { color: var(--text-dim); margin-bottom: 1.8rem; }
.contact-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ---------- FOOTER ---------- */
.footer {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem 1rem 3rem;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* ---------- REVEAL ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }