/* ═══════════════════════════════════════════════════════════════════════
   SUJAL MALLICK — PORTFOLIO
   Monochrome editorial aesthetic
   Fonts: DM Serif Display (headings) + Poppins (body/ui)
   ═══════════════════════════════════════════════════════════════════════ */

/* ── 1. DESIGN TOKENS ─────────────────────────────────────────────────── */
:root {
  /* Typography */
  --font-serif: 'DM Serif Display', Georgia, serif;
  --font-sans:  'Poppins', system-ui, sans-serif;

  /* Accent — muted terracotta, used sparingly */
  --accent:       #B85C38;
  --accent-hover: #96471E;

  /* Light mode (default) */
  --bg:           #FAFAF8;
  --bg-surface:   #F2F1EC;
  --text:         #111110;
  --text-muted:   #69696A;
  --border:       #D4D3CC;
  --border-light: #E8E7E0;

  /* Layout */
  --nav-h:        64px;
  --section-py:   7rem;
  --section-px:   clamp(1.5rem, 7vw, 8rem);
  --max-w:        1080px;

  /* Motion */
  --ease: 0.28s ease;
}

/* Dark mode — manual override via data-theme="dark" */
[data-theme="dark"] {
  --bg:           #0F0F0E;
  --bg-surface:   #1A1A18;
  --text:         #EDECE5;
  --text-muted:   #888882;
  --border:       #2E2E2A;
  --border-light: #232321;
}

/* Dark mode — system preference, no manual override set yet */
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --bg:           #0F0F0E;
    --bg-surface:   #1A1A18;
    --text:         #EDECE5;
    --text-muted:   #888882;
    --border:       #2E2E2A;
    --border-light: #232321;
  }
}

/* ── 2. RESET & BASE ──────────────────────────────────────────────────── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

img { max-width: 100%; display: block; }
ul  { list-style: none; }
a   { color: inherit; text-decoration: none; transition: color var(--ease); }

/* ── 3. NAVIGATION ────────────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border-light);
  padding: 0 var(--section-px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: (--nav-h);
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  color: var(--text);
  cursor: default;
  user-select: none;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color var(--ease);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 2px;
  width: 34px;
  height: 34px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: color var(--ease), border-color var(--ease);
  flex-shrink: 0;
  font-size: 14px;
  line-height: 1;
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--text);
}

/* Sun icon in light mode */
.theme-icon::before { content: '☀'; }

/* Moon icon in dark mode */
[data-theme="dark"] .theme-icon::before { content: '☽'; }

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) .theme-icon::before { content: '☽'; }
}

/* ── 4. HAMBURGER NAV (mobile) ────────────────────────────────────────── */
#hamburger-nav { display: none; }

.nav-right-mobile {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.hamburger-menu { position: relative; }

.hamburger-icon {
  background: none;
  border: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 18px;
  width: 24px;
  cursor: pointer;
  padding: 0;
}

.hamburger-icon span {
  display: block;
  width: 100%;
  height: 1.5px;
  background-color: var(--text);
  transition: all 0.3s ease;
}

.hamburger-icon.open span:first-child  { transform: rotate(45deg) translate(7px, 4px); }
.hamburger-icon.open span:nth-child(2) { opacity: 0; }
.hamburger-icon.open span:last-child   { transform: rotate(-45deg) translate(7px, -4px); }

.menu-links {
  position: absolute;
  top: calc(100% + 0.75rem);
  right: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  min-width: 160px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.menu-links.open { max-height: 320px; }

.menu-links li a {
  display: block;
  padding: 0.75rem 1.25rem;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-light);
  transition: color var(--ease);
}

.menu-links li:last-child a { border-bottom: none; }
.menu-links li a:hover      { color: var(--text); }

/* ── 5. SECTION COMMON ────────────────────────────────────────────────── */
section {
  padding: var(--section-py) var(--section-px);
  border-top: 1px solid var(--border-light);
}

.section-header {
  margin-bottom: 4rem;
}

.section-label {
  display: block;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.section-header h2 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3.4rem);
  font-weight: 400;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--text);
  max-width: 680px;
}

.section-header h2 em {
  font-style: italic;
   color: var(--accent);
}

#about .section-header h2 em { color: var(--accent); }

/* ── 6. SCROLL REVEAL ─────────────────────────────────────────────────── */
.reveal {
  opacity: 1; /* Default for reduced motion */
  transform: translateY(0);
}

.reveal-divider { border-top: none !important; position: relative; }
.reveal-divider::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 1px;
  width: 100%;
  background: var(--border-light);
}

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .reveal.visible {
    opacity: 1;
    transform: translateY(0);
  }
  
  .reveal-divider::before {
    transform-origin: left;
    transform: scaleX(0);
    transition: transform 1s cubic-bezier(0.16, 1, 0.3, 1);
  }
  
  .reveal-divider.visible::before {
    transform: scaleX(1);
  }
}

/* ── 7. HERO / PROFILE ────────────────────────────────────────────────── */
#profile {
  min-height: calc(100svh - var(--nav-h));
  display: flex;
  align-items: center;
  border-top: none;
  padding: 4rem var(--section-px);
}

.profile-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 5rem;
  align-items: center;
  max-width: var(--max-w);
  width: 100%;
}

.section__pic-container {
  width: clamp(200px, 24vw, 320px);
  aspect-ratio: 1;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.profile-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%; /* Circular photo */
  filter: grayscale(15%);
  transition: filter 0.4s ease;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2; /* Sits above canvas */
}

.profile-photo:hover { filter: grayscale(0%); }

.section__text { 
  text-align: left;
  position: relative;
  z-index: 2; 
}

.section__text_p1 {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.03em;
  margin-bottom: 0.4rem;
}

.title {
  font-family: var(--font-serif);
  font-size: clamp(3.5rem, 7.5vw, 6.5rem);
  font-weight: 400;
  line-height: 1.0;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 0.75rem;
}

.section__text_p2 {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 2rem;
}

/* Buttons */
.btn-container {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.btn {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.7rem 1.6rem;
  border-radius: 2px;
  cursor: pointer;
  display: inline-block;
  transition: background-color var(--ease), color var(--ease), border-color var(--ease);
}

.btn--outline {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
}

.btn--outline:hover {
  border-color: var(--text);
  background: var(--text);
  color: var(--bg);
}

.btn--fill {
  border: 1px solid var(--text);
  background: var(--text);
  color: var(--bg);
}

.btn--fill:hover {
  background: transparent;
  color: var(--text);
}

.btn--wide { width: 100%; text-align: center; }

/* Social icons */
#socials-container {
  display: flex;
  gap: 0.875rem;
  align-items: center;
}

.icon {
  height: 1.375rem;
  width: auto;
  opacity: 0.55;
  transition: opacity var(--ease);
}

.icon:hover { opacity: 1; }

/* Invert icons in dark mode so they're visible on dark backgrounds */
[data-theme="dark"] .icon { filter: brightness(0) invert(1); }
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) .icon { filter: brightness(0) invert(1); }
}

/* ── 8. ABOUT ──────────────────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  max-width: var(--max-w);
}

.about-bio p {
  font-size: 0.975rem;
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 1.25rem;
}

.about-bio p:last-child { margin-bottom: 0; }
.about-bio strong { color: var(--text); font-weight: 600; }

.skills-heading {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.skills-group {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
}

.skills-group:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.skill-label {
  display: block;
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.65rem;
}

.skill-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.chip {
  font-size: 0.76rem;
  font-weight: 400;
  padding: 0.28rem 0.7rem;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 2px;
  letter-spacing: 0.01em;
  transition: border-color var(--ease), background-color var(--ease);
}

.chip:hover {
  border-color: var(--text);
  background: var(--bg-surface);
}

/* ── 9. EXPERIENCE ─────────────────────────────────────────────────────── */
.experience-list { max-width: var(--max-w); }

.exp-entry {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 3rem;
  padding: 3rem 0;
  border-top: 1px solid var(--border-light);
}

.exp-meta { padding-top: 0.2rem; }

.exp-date {
  display: block;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
  letter-spacing: 0.01em;
}

.exp-type {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.18rem 0.5rem;
  border-radius: 2px;
}

.exp-header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.875rem;
}

.exp-role {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--text);
}

.exp-company {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
}

.exp-description {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.exp-description strong { color: var(--text); }

.exp-bullets {
  margin-left: 1.1rem;
  margin-bottom: 1.25rem;
}

.exp-bullets li {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 0.45rem;
  list-style: disc;
}

.exp-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.exp-tag {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  padding: 0.18rem 0.55rem;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 2px;
}

/* ── 10. PROJECTS ──────────────────────────────────────────────────────── */

/* — Featured flagship card — */
.project-featured {
  border: 1px solid var(--border);
  padding: 2.5rem;
  max-width: var(--max-w);
  background: var(--bg-surface);
  transition: border-color var(--ease);
  margin-bottom: 0;
}

.project-featured:hover { border-color: var(--text-muted); }

.project-featured-header {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.project-entry-header {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  margin-bottom: 0.875rem;
}

.project-index {
  font-family: var(--font-serif);
  font-size: 2.8rem;
  font-weight: 400;
  color: var(--border);
  line-height: 1;
  flex-shrink: 0;
  min-width: 2.8rem;
  transition: color var(--ease);
  user-select: none;
}

.project-featured:hover .project-index,
.project-entry:hover .project-index {
  color: var(--text-muted);
}

.project-featured-meta,
.project-entry-meta { flex: 1; }

.project-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 0.2rem;
}

.project-badge {
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.project-link {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: color var(--ease), border-color var(--ease), transform var(--ease);
}

.project-link:hover {
  color: var(--text);
  border-color: var(--text);
  transform: translate(2px, -2px);
}

.project-description {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.82;
  margin-bottom: 1.5rem;
}

/* Architecture callout (BugMind AI) */
.architecture-callout {
  border-left: 2px solid var(--accent);
  padding: 0.875rem 1.1rem;
  margin-bottom: 1.5rem;
  background: var(--bg);
}

.arch-label {
  display: block;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.arch-flow {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.arch-node {
  font-family: 'Courier New', 'Consolas', monospace;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text);
  background: var(--bg-surface);
  padding: 0.18rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 2px;
}

.arch-arrow {
  color: var(--accent);
  font-weight: 700;
  font-size: 1rem;
}

.arch-sub {
  display: block;
  font-size: 0.76rem;
  color: var(--text-muted);
  font-style: italic;
  line-height: 1.5;
}

/* Stack row */
.project-stack {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.stack-item { font-weight: 500; }
.stack-sep  { color: var(--border); }

/* Project list (items 02, 03) */
.project-list { max-width: var(--max-w); }

.project-entry {
  padding: 2rem 0;
  border-top: 1px solid var(--border-light);
  transition: all var(--ease);
}

.project-entry:last-child {
  border-bottom: 1px solid var(--border-light);
}

/* ── 11. CONTACTS ──────────────────────────────────────────────────────── */
.contacts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  max-width: var(--max-w);
}

.contacts-intro {
  font-size: 0.975rem;
  color: var(--text-muted);
  line-height: 1.82;
  margin-bottom: 2.25rem;
}

.contacts-links {
  display: flex;
  flex-direction: column;
  margin-bottom: 2rem;
}

.contact-link {
  display: flex;
  flex-direction: column;
  padding: 0.875rem 0;
  border-bottom: 1px solid var(--border-light);
  transition: color var(--ease);
}

.contact-link:first-child { border-top: 1px solid var(--border-light); }

.contact-link:hover .contact-link-value { color: var(--accent); }

.contact-link-label {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.contact-link-value {
  font-size: 0.93rem;
  color: var(--text);
  transition: color var(--ease);
}

.socials-row {
  display: flex;
  gap: 0.875rem;
  align-items: center;
}

/* Contact form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.63rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 0.7rem 0.9rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--text);
  outline: none;
  width: 100%;
  resize: vertical;
  transition: border-color var(--ease), background-color 0.25s ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.55;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--text);
}

/* ── 12. FOOTER ────────────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border-light);
  padding: 1.75rem var(--section-px);
}

.footer-inner {
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 0.76rem;
  color: var(--text-muted);
  max-width: var(--max-w);
}

/* ── PREMIUM UPGRADES ──────────────────────────────────────────────────── */

/* 1. Swarm Canvas */
#swarm-canvas {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 200%;
  height: 200%;
  z-index: -1;
  pointer-events: none;
}


/* 3. Typography Mask Reveal */
.mask-wrap {
  display: inline-block;
  overflow: hidden;
  vertical-align: top;
}

.mask-reveal {
  display: inline-block;
  transform: translateY(110%);
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.mask-reveal.visible {
  transform: translateY(0);
}

.mask-reveal.delay-1 {
  transition-delay: 0.15s;
}