/* ─────────────────────────────────────────
   Design Tokens
───────────────────────────────────────── */
:root {
  --color-bg:         #FFFFFF;
  --color-surface:    #F2F2F2;
  --color-text:       #171717;
  --color-text-muted: #737373;
  --color-border:     rgba(23, 23, 23, 0.08);

  --color-nav-bg:     #12121A;
  --color-nav-pill:   #1F1F26;
  --color-nav-text:   rgba(255, 255, 255, 0.55);
  --color-nav-text-active: #FFFFFF;
  --color-nav-cta-bg:   #FFFFFF;
  --color-nav-cta-text: #12121A;

  --font-family: 'General Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;

  --text-hero:    clamp(1.9rem, 4.2vw, 3.4rem);
  --text-section: clamp(2.2rem, 4.5vw, 3.6rem);
  --text-contact: clamp(2rem, 5vw, 4rem);
  --text-body:    clamp(1rem, 1.1vw, 1.125rem);
  --text-label:   0.75rem;

  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  2rem;
  --space-lg:  4rem;
  --space-xl:  7rem;
  --space-xxl: 9rem;

  --ease-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast:  180ms;
  --dur-med:   380ms;
  --dur-slow:  650ms;

  --radius-card: 32px;
  --radius-pill: 999px;

  --max-w:  1280px;
  --pad-x:  clamp(1.5rem, 5vw, 4rem);
}

:root[data-theme="dark"] {
  --color-bg:         #0B0B0D;
  --color-surface:    #16161A;
  --color-text:       #F2F2F2;
  --color-text-muted: #8C8C93;
  --color-border:     rgba(255, 255, 255, 0.1);

  --color-nav-bg:     #F2F2F2;
  --color-nav-pill:   #FFFFFF;
  --color-nav-text:   rgba(11, 11, 13, 0.55);
  --color-nav-text-active: #0B0B0D;
  --color-nav-cta-bg:   #0B0B0D;
  --color-nav-cta-text: #F2F2F2;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg:         #0B0B0D;
    --color-surface:    #16161A;
    --color-text:       #F2F2F2;
    --color-text-muted: #8C8C93;
    --color-border:     rgba(255, 255, 255, 0.1);

    --color-nav-bg:     #F2F2F2;
    --color-nav-pill:   #FFFFFF;
    --color-nav-text:   rgba(11, 11, 13, 0.55);
    --color-nav-text-active: #0B0B0D;
    --color-nav-cta-bg:   #0B0B0D;
    --color-nav-cta-text: #F2F2F2;
  }
}

/* ─────────────────────────────────────────
   Reset & Base
───────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--dur-med) var(--ease-expo), color var(--dur-med) var(--ease-expo);
}

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

ul {
  list-style: none;
}

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

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.arrow-up-right {
  display: inline-block;
}

/* ─────────────────────────────────────────
   Theme Toggle
───────────────────────────────────────── */
.theme-toggle {
  position: fixed;
  top: 2rem;
  left: var(--pad-x);
  z-index: 1001;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 0.3rem;
}

.theme-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-pill);
  padding: 0.45rem 0.9rem;
  cursor: pointer;
  transition: background var(--dur-fast), color var(--dur-fast);
}

.theme-btn svg {
  flex-shrink: 0;
}

.theme-btn.is-active {
  background: var(--color-bg);
  color: var(--color-text);
  box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}

/* ─────────────────────────────────────────
   Floating Pill Navigation
───────────────────────────────────────── */
.pill-nav {
  position: fixed;
  top: 1.75rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 0.2rem;
  background: var(--color-nav-bg);
  border-radius: var(--radius-pill);
  padding: 0.55rem 0.6rem;
  box-shadow:
    0 28px 9px rgba(0,0,0,0.01),
    0 16px 9px rgba(0,0,0,0.02),
    0 7px 7px rgba(0,0,0,0.03),
    0 2px 4px rgba(0,0,0,0.04);
  transition: background var(--dur-med) var(--ease-expo);
}

.pill-avatar {
  width: 2.15rem;
  height: 2.15rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-nav-text-active);
  background: var(--color-nav-pill);
  margin-right: 0.35rem;
  flex-shrink: 0;
}

.pill-link {
  position: relative;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-nav-text);
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-pill);
  transition: background var(--dur-fast), color var(--dur-fast);
  white-space: nowrap;
}

.pill-link:hover {
  color: var(--color-nav-text-active);
}

.pill-link.is-active {
  background: var(--color-nav-pill);
  color: var(--color-nav-text-active);
}

.pill-count {
  font-size: 0.6rem;
  margin-left: 0.15rem;
  opacity: 0.7;
  vertical-align: super;
}

.pill-cta {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-nav-cta-text);
  background: var(--color-nav-cta-bg);
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-pill);
  margin-left: 0.25rem;
  transition: opacity var(--dur-fast);
  white-space: nowrap;
}

.pill-cta:hover {
  opacity: 0.85;
}

/* ─────────────────────────────────────────
   Clock Widget
───────────────────────────────────────── */
.clock-widget {
  position: fixed;
  top: 2rem;
  right: var(--pad-x);
  z-index: 1001;
  text-align: right;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--color-text);
}

.clock-widget span {
  display: block;
}

#clock-zone {
  color: var(--color-text-muted);
  font-size: 0.78rem;
}

/* ─────────────────────────────────────────
   Hero
───────────────────────────────────────── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 9rem var(--pad-x) var(--space-lg);
  background: var(--color-bg);
}

.hero-inner {
  max-width: 980px;
  margin: 0 auto;
  text-align: center;
}

.hero-heading {
  font-size: var(--text-hero);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.accent-underline {
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 4px;
}

.hero-sub {
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 1.75rem auto 0;
}

/* ─────────────────────────────────────────
   Work
───────────────────────────────────────── */
#work {
  background: var(--color-bg);
  padding: var(--space-xl) 0 var(--space-xxl);
  border-top: 1px solid var(--color-border);
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.section-title {
  font-size: var(--text-section);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--color-text);
}

.section-label {
  display: block;
  font-size: var(--text-label);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.see-all {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--color-border);
  transition: border-color var(--dur-fast);
}

.see-all:hover {
  border-color: var(--color-text);
}

.work-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3rem 2rem;
}

.project-card {
  display: block;
}

.card-image {
  position: relative;
  background: var(--color-surface);
  overflow: hidden;
  aspect-ratio: 1350 / 1080;
  border-radius: var(--radius-card);
}

.card-cover {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-slow) var(--ease-expo);
}

.project-card:hover .card-cover {
  transform: scale(1.03);
}

.card-info {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.25rem;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.3;
  color: var(--color-text);
}

.card-meta {
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-top: 0.3rem;
}

.card-link-label {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--dur-med) var(--ease-expo), transform var(--dur-med) var(--ease-expo);
  white-space: nowrap;
  padding-top: 0.15rem;
}

.project-card:hover .card-link-label {
  opacity: 1;
  transform: translateY(0);
}

/* ─────────────────────────────────────────
   About
───────────────────────────────────────── */
#about {
  background: var(--color-bg);
  color: var(--color-text);
  padding: var(--space-xxl) 0;
  border-top: 1px solid var(--color-border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(3rem, 6vw, 7rem);
  align-items: start;
}

.about-left {
  position: sticky;
  top: 8rem;
}

.about-pullquote {
  font-size: clamp(1.5rem, 2.4vw, 2.2rem);
  font-weight: 400;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--color-text);
  border-left: 2px solid var(--color-border);
  padding-left: 1.75rem;
  font-style: normal;
}

.about-right {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.about-title {
  font-size: var(--text-section);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--color-text);
}

.about-bio {
  font-size: var(--text-body);
  line-height: 1.8;
  color: var(--color-text-muted);
  max-width: 52ch;
}

.about-bio + .about-bio {
  margin-top: -2rem;
}

strong.highlight {
  font-weight: 600;
  color: var(--color-text);
}

.skills-label {
  font-size: var(--text-label);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skills-list li {
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition:
    border-color var(--dur-fast),
    color var(--dur-fast);
}

.skills-list li:hover {
  border-color: var(--color-text);
  color: var(--color-text);
}

/* ─────────────────────────────────────────
   Contact
───────────────────────────────────────── */
#contact {
  background: var(--color-bg);
  color: var(--color-text);
  padding: var(--space-xxl) 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.contact-inner {
  max-width: 720px;
}

.contact-cta {
  font-size: var(--text-contact);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin: var(--space-md) 0 var(--space-lg);
}

.contact-email {
  display: inline-block;
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.3rem;
  transition: border-color var(--dur-fast), color var(--dur-fast);
}

.contact-email:hover {
  border-color: var(--color-text);
}

/* ─────────────────────────────────────────
   Footer
───────────────────────────────────────── */
#site-footer {
  background: var(--color-bg);
  padding: 2.5rem 0;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-copy {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--dur-fast);
}

.footer-copy:hover {
  color: var(--color-text);
}

.footer-socials {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.footer-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--dur-fast);
}

.footer-link:hover {
  color: var(--color-text);
}

/* ─────────────────────────────────────────
   Scroll Reveal Animations
───────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition:
    opacity var(--dur-slow) var(--ease-expo),
    transform var(--dur-slow) var(--ease-expo);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger > * {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.6s var(--ease-expo),
    transform 0.6s var(--ease-expo);
}

.reveal-stagger.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger.is-visible > *:nth-child(2) { transition-delay: 60ms; }
.reveal-stagger.is-visible > *:nth-child(3) { transition-delay: 120ms; }
.reveal-stagger.is-visible > *:nth-child(4) { transition-delay: 180ms; }
.reveal-stagger.is-visible > *:nth-child(5) { transition-delay: 240ms; }
.reveal-stagger.is-visible > *:nth-child(6) { transition-delay: 300ms; }
.reveal-stagger.is-visible > *:nth-child(7) { transition-delay: 360ms; }
.reveal-stagger.is-visible > *:nth-child(8) { transition-delay: 420ms; }
.reveal-stagger.is-visible > *:nth-child(9) { transition-delay: 480ms; }
.reveal-stagger.is-visible > *:nth-child(10) { transition-delay: 540ms; }
.reveal-stagger.is-visible > *:nth-child(11) { transition-delay: 600ms; }
.reveal-stagger.is-visible > *:nth-child(12) { transition-delay: 660ms; }

.reveal-stagger.is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* ─────────────────────────────────────────
   Responsive — Tablet ≤1024px
───────────────────────────────────────── */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .about-left {
    position: static;
  }
}

/* ─────────────────────────────────────────
   Responsive — Mobile ≤768px
───────────────────────────────────────── */
@media (max-width: 768px) {
  .theme-toggle {
    top: 1.25rem;
    left: 1.25rem;
    transform: scale(0.9);
    transform-origin: left top;
  }

  .clock-widget {
    display: none;
  }

  .pill-nav {
    top: auto;
    bottom: 1.25rem;
    max-width: calc(100vw - 2rem);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .pill-link {
    padding: 0.5rem 0.7rem;
    font-size: 0.8rem;
  }

  .pill-cta {
    padding: 0.5rem 0.85rem;
    font-size: 0.8rem;
  }

  #hero {
    padding: 8rem var(--pad-x) var(--space-lg);
    min-height: auto;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
  }

  /* Work: single column */
  .work-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .card-image {
    aspect-ratio: 16 / 9;
  }

  .card-link-label {
    opacity: 1;
    transform: translateY(0);
  }

  /* Spacing reduction */
  #work,
  #about,
  #contact {
    padding: var(--space-xl) 0;
  }

  #site-footer {
    padding: 2rem 0 6rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 1.25rem;
    text-align: center;
  }
}

/* ─────────────────────────────────────────
   Responsive — Small Mobile ≤480px
───────────────────────────────────────── */
@media (max-width: 480px) {
  .card-image {
    aspect-ratio: 4 / 3;
  }

  .footer-socials {
    gap: 1.25rem;
  }
}