/* ==========================================================================
   Sunny Kapoor: Personal site
   Theme: Anthropic-inspired light (default) + dark, semantic tokens
   ========================================================================== */

/* --------------------------------------------------------------------------
   Theme tokens: light (default)
   -------------------------------------------------------------------------- */
:root,
[data-theme="light"] {
  --color-bg-page: #f7f4ee;
  --color-bg-canvas: #f4efe6;
  --color-bg-surface: #efe9df;
  --color-bg-surface-raised: #f3ede4;
  --color-bg-surface-muted: #ece6db;
  --color-border-subtle: #d8d0c3;
  --color-border-strong: #c6bcad;
  --color-text-primary: #171411;
  --color-text-secondary: #4a433b;
  --color-text-muted: #6b6359;
  --color-text-disabled: #93897a;
  --color-accent: #1f1a15;
  --color-accent-strong: #0f0c0a;
  --color-link: #2563a8;
  --color-link-hover: #1e4d82;
  --color-success: #2f7a57;
  --color-warning: #a26a1b;
  --color-danger: #a14545;
  --color-info: #556e9d;
  --color-focus-ring: #3d6fb6;
  --font-display: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-pill: 9999px;
  --space-unit: 8px;
  --space-1: calc(1 * var(--space-unit));
  --space-2: calc(2 * var(--space-unit));
  --space-3: calc(3 * var(--space-unit));
  --space-4: calc(4 * var(--space-unit));
  --space-5: calc(5 * var(--space-unit));
  --space-6: calc(6 * var(--space-unit));
  --max-width: 880px;
}

/* --------------------------------------------------------------------------
   Theme tokens: dark
   -------------------------------------------------------------------------- */
[data-theme="dark"] {
  --color-bg-page: #171411;
  --color-bg-canvas: #1f1a15;
  --color-bg-surface: #2a2520;
  --color-bg-surface-raised: #332e28;
  --color-bg-surface-muted: #252019;
  --color-border-subtle: #3d3832;
  --color-border-strong: #4a433b;
  --color-text-primary: #f4efe6;
  --color-text-secondary: #c6bcad;
  --color-text-muted: #93897a;
  --color-text-disabled: #6b6359;
  --color-accent: #e8e4dc;
  --color-accent-strong: #f4efe6;
  --color-link: #6b9ed4;
  --color-link-hover: #8bb4e0;
  --color-success: #4a9d7a;
  --color-warning: #c68a2e;
  --color-danger: #c65a5a;
  --color-info: #6b8abd;
  --color-focus-ring: #5a8fd4;
}

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-page);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

a:hover {
  color: var(--color-link-hover);
}

a:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-accent);
  color: var(--color-bg-page);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-sm);
  z-index: 100;
  transition: top 0.15s ease-out;
}

.skip-link:focus {
  top: var(--space-2);
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
}

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

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.site-header {
  border-bottom: 1px solid var(--color-border-subtle);
  background-color: var(--color-bg-page);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-text-secondary);
}

.nav a:hover {
  color: var(--color-text-primary);
}

.theme-toggle-wrap {
  margin-left: auto;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-bg-surface);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.theme-toggle:hover {
  background: var(--color-bg-surface-raised);
  color: var(--color-text-primary);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
}

.theme-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 0;
}

.theme-icon svg {
  display: block;
}

[data-theme="light"] .theme-icon-moon,
[data-theme="dark"] .theme-icon-sun {
  display: none !important;
}

[data-theme="light"] .theme-icon-sun,
[data-theme="dark"] .theme-icon-moon {
  display: inline-flex !important;
}

/* --------------------------------------------------------------------------
   Main content
   -------------------------------------------------------------------------- */
.page {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-5) var(--space-4);
  width: 100%;
}

.divider {
  border: 0;
  height: 0;
  border-top: 1px solid var(--color-border-subtle);
  margin: var(--space-5) 0;
}

/* --------------------------------------------------------------------------
   Profile block
   -------------------------------------------------------------------------- */
.profile-block {
  margin-bottom: var(--space-2);
  padding: var(--space-4);
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
}

.profile-intro {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-5);
  align-items: start;
}

@media (max-width: 640px) {
  .profile-intro {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
}

.profile-image {
  width: 220px;
  height: 220px;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
}

@media (max-width: 640px) {
  .profile-image {
    width: 180px;
    height: 180px;
    justify-self: start;
  }
}

.display-name {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 var(--space-3);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.bio {
  margin: 0 0 var(--space-3);
  color: var(--color-text-secondary);
  max-width: 56ch;
}

.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.profile-links a {
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
}

.profile-links a::after {
  content: " · ";
  color: var(--color-text-muted);
  font-weight: 400;
  text-decoration: none;
}

.profile-links a:last-child::after {
  content: "";
}

/* --------------------------------------------------------------------------
   Section titles (editorial / serif)
   -------------------------------------------------------------------------- */
.section-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 var(--space-4);
  color: var(--color-text-primary);
}

/* --------------------------------------------------------------------------
   Updates
   -------------------------------------------------------------------------- */
.updates-section {
  margin-bottom: var(--space-2);
}

.updates-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.update-item {
  display: grid;
  grid-template-columns: 6ch 1fr auto;
  gap: var(--space-3);
  align-items: baseline;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

.update-item:last-of-type {
  border-bottom: 0;
}

@media (max-width: 520px) {
  .update-item {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

  .update-date {
    margin-bottom: 0;
  }
}

.update-date {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.update-desc {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

.update-link {
  font-size: 0.875rem;
  text-decoration: none;
  white-space: nowrap;
}

.updates-more {
  margin: var(--space-4) 0 0;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.button {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-pill);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
}

.button-secondary {
  background: var(--color-bg-surface);
  color: var(--color-text-primary);
  border-color: var(--color-border-strong);
}

.button-secondary:hover {
  background: var(--color-bg-surface-raised);
}

.button-primary {
  background: var(--color-accent);
  color: var(--color-bg-page);
}

.button-primary:hover {
  background: var(--color-accent-strong);
}

/* --------------------------------------------------------------------------
   Research
   -------------------------------------------------------------------------- */
.research-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.research-item {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border-subtle);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.research-item:last-child {
  border-bottom: 0;
}

@media (min-width: 720px) {
  .research-item {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .research-item:nth-child(even) .research-content {
    order: 2;
  }

  .research-item:nth-child(even) .research-visual {
    order: 1;
  }
}

.research-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 var(--space-2);
  color: var(--color-text-primary);
}

.research-authors,
.research-venue {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-1);
}

.research-links {
  margin: var(--space-2) 0;
  font-size: 0.875rem;
}

.research-links a::after {
  content: " · ";
  color: var(--color-text-muted);
}

.research-links a:last-child::after {
  content: "";
}

.research-abstract {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin: 0;
  max-width: 50ch;
}

.research-visual img {
  width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-subtle);
}

/* --------------------------------------------------------------------------
   Contact
   -------------------------------------------------------------------------- */
.contact-section {
  margin-bottom: var(--space-2);
}

.contact-text {
  margin: 0;
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-border-subtle);
  padding: var(--space-3) var(--space-4);
  text-align: center;
}

.site-footer p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Resume page
   -------------------------------------------------------------------------- */
.resume-main {
  max-width: 720px;
}

.resume {
  padding-bottom: var(--space-5);
}

.resume-header {
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border-subtle);
}

.resume-name {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 600;
  margin: 0 0 var(--space-1);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.resume-title {
  margin: 0 0 var(--space-2);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.resume-contact {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.resume-contact a {
  text-decoration: none;
}

.resume-contact a:hover {
  text-decoration: underline;
}

.resume-contact-sep {
  margin: 0 var(--space-1);
  color: var(--color-text-muted);
  user-select: none;
}

.resume-section {
  margin-bottom: var(--space-4);
}

.resume-section-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 var(--space-2);
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.resume-summary {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
  max-width: 65ch;
}

.resume-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.resume-job {
  margin-bottom: var(--space-3);
}

.resume-edu {
  margin-bottom: var(--space-2);
}

.resume-job:last-child,
.resume-edu:last-child {
  margin-bottom: 0;
}

.resume-job-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-1);
}

.resume-job-title {
  font-weight: 600;
  color: var(--color-text-primary);
  font-size: 0.9375rem;
}

.resume-job-date {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.resume-job-org {
  margin: 0 0 var(--space-1);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.resume-bullets {
  margin: 0;
  padding-left: 1.25em;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.resume-bullets li {
  margin-bottom: 0.25em;
}

.resume-edu-list .resume-job-org {
  margin-bottom: 0;
}

.resume-skills {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

.resume-note {
  margin: var(--space-2) 0 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-style: italic;
}

.resume-pub-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.resume-pub {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.resume-pub-title {
  font-weight: 500;
  color: var(--color-text-primary);
}

.resume-pub-authors,
.resume-pub-venue {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.resume-pub a {
  font-size: 0.875rem;
  margin-left: 0.25em;
}

.resume-print-hint {
  margin: 0;
  padding: var(--space-3) 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.resume-print-hint kbd {
  font-family: var(--font-body);
  padding: 0.1em 0.35em;
  font-size: 0.9em;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
}

/* Resume: print */
@media print {
  .resume-page .site-header,
  .resume-page .skip-link,
  .resume-print-hint {
    display: none !important;
  }

  .resume-page body {
    background: #fff;
  }

  .resume-main {
    max-width: none;
    padding-top: 0;
  }

  .resume {
    padding-bottom: 0;
  }

  .resume-header {
    border-bottom-color: #ccc;
  }

  .resume-section-title {
    color: #111;
  }

  .resume-name {
    color: #111;
  }

  .resume-contact a,
  .resume-summary,
  .resume-job-title,
  .resume-job-org,
  .resume-bullets,
  .resume-skills,
  .resume-pub {
    color: #333;
  }

  .resume-contact-sep,
  .resume-job-date,
  .resume-pub-authors,
  .resume-pub-venue,
  .resume-note {
    color: #666;
  }

  .resume-pub a {
    color: #2563a8;
  }
}

/* --------------------------------------------------------------------------
   Accessibility: reduce motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}