/* ==========================================================================
   Sreerag K P — Portfolio
   Deep-space / black-hole design system: void background, animated starfield,
   accretion-disk glow accents, restrained mysterious motion.
   ========================================================================== */

:root {
  /* Core palette — deep void, starlight, accretion-disk glow */
  --void: #030308;
  --void-soft: #08080f;
  --panel: rgba(18, 18, 30, 0.6);
  --panel-solid: #12121e;
  --panel-2: #191927;
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.2);
  --star: #eef0f7;
  --grey: #9ba0b4;
  --grey-faint: #62667c;

  --amber: #ffb454;
  --orange: #ff7a45;
  --gold: #ffd27a;
  --violet: #8b5cf6;
  --indigo: #4f46e5;

  --grad-disk: conic-gradient(from 0deg, #ff7a45, #ffd27a, #fff6e8, #8b5cf6, #4f46e5, #ff7a45);
  --grad-text: linear-gradient(100deg, #fff6e8 0%, #ffb454 45%, #8b5cf6 100%);
  --grad-btn: linear-gradient(135deg, #ff7a45 0%, #8b5cf6 100%);
  --grad-glow-amber: radial-gradient(circle, rgba(255, 180, 84, 0.32), transparent 70%);
  --grad-glow-violet: radial-gradient(circle, rgba(139, 92, 246, 0.28), transparent 70%);

  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "Inter", "Segoe UI", sans-serif;
  --font-mono: "Space Mono", "Consolas", monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 50px rgba(255, 122, 69, 0.15), 0 0 90px rgba(139, 92, 246, 0.1);

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --container: 1160px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, picture { max-width: 100%; display: block; }
button, input, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }

body {
  background: var(--void);
  color: var(--grey);
  font-family: var(--font-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

#starfield {
  position: fixed;
  inset: 0;
  z-index: -2;
  display: block;
  background: radial-gradient(ellipse at 50% -10%, #0d0d1c 0%, var(--void) 55%);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--panel-solid);
  color: var(--star);
  padding: 12px 20px;
  z-index: 1000;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------- Scroll progress bar ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0%;
  background: var(--grad-btn);
  z-index: 1000;
  box-shadow: 0 0 10px rgba(255, 122, 69, 0.5);
  transition: width 0.1s linear;
}

/* ---------- Layout helpers ---------- */
.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}
section { position: relative; z-index: 1; padding: 108px 0; }
.section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 48px;
}
.section-num {
  font-family: var(--font-mono);
  color: var(--amber);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.8vw, 2.5rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--star);
}
.section-title .accent {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.section-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line-strong), transparent);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 22px; height: 1px;
  background: var(--amber);
  display: inline-block;
  opacity: 0.6;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.3s var(--ease), background 0.35s var(--ease);
  white-space: nowrap;
}
.btn-primary {
  background: var(--grad-btn);
  color: #0a0a12;
  font-weight: 700;
  box-shadow: 0 8px 26px rgba(255, 122, 69, 0.22);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 14px 36px rgba(139, 92, 246, 0.35); }
.btn-ghost {
  background: rgba(255, 255, 255, 0.02);
  border-color: var(--line-strong);
  color: var(--star);
  backdrop-filter: blur(6px);
}
.btn-ghost:hover { border-color: var(--amber); background: rgba(255, 180, 84, 0.06); transform: translateY(-3px); }
.btn-sm { padding: 9px 18px; font-size: 0.84rem; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 900;
  padding: 20px 0;
  transition: padding 0.35s var(--ease), background 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.site-header.scrolled {
  padding: 12px 0;
  background: rgba(3, 3, 8, 0.72);
  backdrop-filter: blur(14px) saturate(140%);
  box-shadow: 0 1px 0 var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; }
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.12rem;
  color: var(--star);
}
.brand-mark {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: var(--void-soft);
  border: 1px solid var(--line-strong);
  position: relative;
  display: flex; align-items: center; justify-content: center;
  color: var(--star);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  overflow: hidden;
}
.brand-mark::before {
  content: "";
  position: absolute;
  inset: -30%;
  background: var(--grad-disk);
  opacity: 0.55;
  animation: spinSlow 12s linear infinite;
  z-index: -1;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a {
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--grey);
  position: relative;
  transition: color 0.25s ease, background 0.25s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--star); background: rgba(255, 255, 255, 0.05); }
.nav-cta { margin-left: 8px; }

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px 7px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--grey);
  font-family: var(--font-mono);
}
.status-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 0 rgba(255, 180, 84, 0.5);
  animation: pulseDot 2.6s infinite;
}
@keyframes pulseDot {
  0% { box-shadow: 0 0 0 0 rgba(255, 180, 84, 0.45); }
  70% { box-shadow: 0 0 0 7px rgba(255, 180, 84, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 180, 84, 0); }
}

/* mobile nav toggle */
.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 20px; height: 1.5px;
  background: var(--star);
  position: relative;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
.nav-toggle span::before, .nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0; width: 20px; height: 1.5px;
  background: var(--star);
  transition: transform 0.3s var(--ease), top 0.3s var(--ease);
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
.nav-toggle.open span { background: transparent; }
.nav-toggle.open span::before { top: 0; transform: rotate(45deg); }
.nav-toggle.open span::after { top: 0; transform: rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 120px;
  position: relative;
  overflow: hidden;
}

/* Decorative black hole — pure CSS, ambient, kept out of the way of text */
.blackhole {
  position: absolute;
  top: 50%; right: -8%;
  width: min(640px, 70vw);
  height: min(640px, 70vw);
  transform: translateY(-50%);
  z-index: 0;
  pointer-events: none;
}
.bh-glow {
  position: absolute;
  inset: -20%;
  background: var(--grad-glow-amber);
  filter: blur(10px);
  opacity: 0.6;
}
.bh-ring {
  position: absolute;
  inset: 6%;
  border-radius: 50%;
  background: var(--grad-disk);
  filter: blur(18px);
  opacity: 0.5;
  animation: spinSlow 50s linear infinite;
}
.bh-ring::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--grad-disk);
  filter: blur(2px);
  opacity: 0.9;
}
.bh-core {
  position: absolute;
  inset: 16%;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, #0c0c14 0%, #000000 62%, #000000 100%);
  box-shadow: inset 0 0 60px rgba(0, 0, 0, 0.9), 0 0 70px rgba(0, 0, 0, 0.6);
}
@keyframes spinSlow {
  to { transform: rotate(360deg); }
}

.hero-inner { position: relative; z-index: 2; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.85fr;
  gap: 52px;
  align-items: center;
}
.hero-kicker {
  font-family: var(--font-mono);
  color: var(--amber);
  letter-spacing: 0.2em;
  font-size: 0.76rem;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
}
.hero-kicker::before {
  content: "";
  width: 26px; height: 1px;
  background: var(--amber);
  display: inline-block;
  opacity: 0.7;
}
.hero-name {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6.6vw, 4.6rem);
  font-weight: 600;
  line-height: 1.04;
  letter-spacing: -0.01em;
  background: var(--grad-text);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: shine 8s linear infinite;
}
@keyframes shine {
  0% { background-position: 0% center; }
  100% { background-position: 200% center; }
}
.hero-role {
  font-size: clamp(1.02rem, 1.9vw, 1.3rem);
  color: var(--grey);
  font-weight: 400;
  margin-top: 16px;
  font-style: italic;
}
.hero-desc {
  margin-top: 24px;
  max-width: 54ch;
  color: var(--grey);
  font-size: 1.02rem;
}
.hero-desc strong { color: var(--star); font-weight: 600; }
.hero-actions {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.hero-stats {
  margin-top: 54px;
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.stat-num {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--star);
}
.stat-label {
  font-size: 0.72rem;
  color: var(--grey-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 5px;
  font-family: var(--font-mono);
}

.hero-portrait { justify-self: center; position: relative; z-index: 2; }
.portrait-frame {
  position: relative;
  width: min(300px, 74vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  padding: 5px;
}
.portrait-frame::before {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  background: var(--grad-disk);
  background-size: 240% 240%;
  animation: spinSlow 10s linear infinite;
  filter: blur(0.5px);
}
.portrait-frame::after {
  content: "";
  position: absolute;
  inset: -22px;
  border-radius: 50%;
  background: var(--grad-glow-amber);
  filter: blur(24px);
  z-index: -1;
}
.portrait-frame img {
  position: relative;
  width: 100%; height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--void);
  filter: saturate(1.02) contrast(1.03);
}

.scroll-cue {
  position: absolute;
  bottom: 30px; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center;
  gap: 8px;
  color: var(--grey-faint);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  z-index: 2;
}
.scroll-cue .line { width: 1px; height: 32px; background: linear-gradient(var(--amber), transparent); animation: scrollLine 2.2s ease-in-out infinite; }
@keyframes scrollLine { 0% { transform: scaleY(0); transform-origin: top; } 50% { transform: scaleY(1); transform-origin: top; } 51% { transform-origin: bottom; } 100% { transform: scaleY(0); transform-origin: bottom; } }

/* ---------- Reveal utility ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }

/* ---------- About ---------- */
.about { background: linear-gradient(180deg, transparent, rgba(139, 92, 246, 0.035), transparent); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.about-text p { color: var(--grey); font-size: 1.04rem; margin-bottom: 18px; }
.about-text strong { color: var(--star); font-weight: 600; }
.about-highlights { margin-top: 28px; display: grid; gap: 16px; }
.hl-item { display: flex; gap: 14px; align-items: flex-start; }
.hl-icon {
  flex: none;
  width: 36px; height: 36px;
  border-radius: 10px;
  background: rgba(255, 180, 84, 0.08);
  border: 1px solid var(--line);
  color: var(--amber);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.78rem;
}
.hl-item h4 { font-family: var(--font-display); font-size: 0.98rem; color: var(--star); margin-bottom: 3px; font-weight: 600; }
.hl-item p { color: var(--grey-faint); font-size: 0.9rem; margin: 0; }

.stat-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.stat-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  backdrop-filter: blur(8px);
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.stat-card:hover { transform: translateY(-6px); border-color: rgba(255, 180, 84, 0.35); box-shadow: var(--shadow-card); }
.stat-card .stat-num { font-size: 1.9rem; }
.stat-card .stat-label { margin-top: 8px; }

/* ---------- Skills ---------- */
.skills-groups { display: grid; gap: 34px; }
.skill-group-title {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 16px;
}
.skill-tags { display: flex; flex-wrap: wrap; gap: 12px; }
.skill-tag {
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--panel);
  border: 1px solid var(--line);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--star);
  backdrop-filter: blur(6px);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.skill-tag:hover { transform: translateY(-3px); border-color: var(--amber); box-shadow: 0 8px 22px rgba(255, 180, 84, 0.12); }

/* ---------- Projects ---------- */
.projects { background: linear-gradient(180deg, transparent, rgba(79, 70, 229, 0.04), transparent); }
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}
.project-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(8px);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease);
}
.project-card:hover { transform: translateY(-7px); box-shadow: var(--shadow-card), var(--shadow-glow); border-color: rgba(255, 255, 255, 0.18); }
.project-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.project-icon {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--grey-faint);
  font-weight: 700;
}
.project-links { display: flex; gap: 10px; }
.icon-link {
  width: 36px; height: 36px;
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.03);
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--line);
  color: var(--grey);
  transition: border-color 0.3s ease, color 0.3s ease, transform 0.3s ease;
}
.icon-link:hover { border-color: var(--amber); color: var(--amber); transform: translateY(-2px); }
.project-title { font-family: var(--font-display); font-size: 1.18rem; font-weight: 600; color: var(--star); margin-bottom: 10px; }
.project-desc { color: var(--grey); font-size: 0.92rem; flex: 1; margin-bottom: 18px; }
.project-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.project-tag {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 5px 10px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--grey-faint);
}
.project-more { text-align: center; margin-top: 46px; }

/* ---------- Contact ---------- */
.contact { text-align: center; }
.contact-inner { max-width: 660px; margin: 0 auto; }
.contact-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.1rem);
  font-weight: 600;
  color: var(--star);
  margin-bottom: 20px;
}
.contact-title .accent {
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.contact-desc { color: var(--grey); font-size: 1.02rem; margin-bottom: 40px; }
.contact-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.contact-socials { display: flex; justify-content: center; gap: 16px; margin-top: 44px; }
.social-btn {
  width: 50px; height: 50px;
  border-radius: 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--grey);
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(6px);
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), color 0.35s var(--ease);
}
.social-btn:hover { transform: translateY(-5px); border-color: var(--amber); color: var(--amber); }

.copy-toast {
  position: fixed;
  bottom: 28px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--panel-solid);
  border: 1px solid var(--line-strong);
  color: var(--star);
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 0.86rem;
  font-family: var(--font-mono);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
  z-index: 999;
  box-shadow: var(--shadow-card);
}
.copy-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 32px 0;
}
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.footer-inner small { color: var(--grey-faint); font-size: 0.8rem; font-family: var(--font-mono); }
.back-to-top {
  width: 42px; height: 42px;
  border-radius: 50%;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--grey);
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), color 0.3s var(--ease);
}
.back-to-top:hover { border-color: var(--amber); color: var(--amber); transform: translateY(-4px); }

/* ---------- Mobile ---------- */
@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-portrait { order: -1; margin-bottom: 10px; }
  .portrait-frame { width: min(230px, 58vw); }
  .blackhole { opacity: 0.6; right: -20%; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 760px) {
  section { padding: 80px 0; }
  .nav-links {
    position: fixed;
    top: 0; right: 0;
    height: 100svh;
    width: min(78vw, 300px);
    background: rgba(5, 5, 12, 0.97);
    backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: 100px 26px 40px;
    gap: 4px;
    transform: translateX(100%);
    transition: transform 0.4s var(--ease);
    border-left: 1px solid var(--line);
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links a { padding: 14px 16px; font-size: 1rem; }
  .nav-cta { margin-left: 0; margin-top: 10px; }
  .nav-toggle { display: flex; }
  .status-pill { display: none; }
  .hero-stats { gap: 26px; }
  .stat-cards { grid-template-columns: 1fr; }
}