/* ===============================================
   barryhan.net — root homepage stylesheet
   Light theme inspired by Mistral AI design system
   (warm cream surfaces · orange primary · editorial serif display)
   =============================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Cormorant+Garamond:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* ----- color tokens ----- */
  --c-primary:        #fa520f;
  --c-primary-deep:   #cc3a05;
  --c-on-primary:     #ffffff;

  --c-sunshine-300:   #ffd06a;
  --c-sunshine-500:   #ffb83e;
  --c-sunshine-700:   #ffa110;
  --c-sunshine-800:   #ff8105;
  --c-sunshine-900:   #ff8a00;
  --c-yellow-saturated: #ffd900;

  --c-cream:          #fff8e0;
  --c-cream-light:    #fffaeb;
  --c-cream-deeper:   #fff0c2;
  --c-beige-deep:     #e6d5a8;

  --c-ink:            #1f1f1f;
  --c-ink-tint:       #3d3d3d;
  --c-charcoal:       #2c2c2c;
  --c-slate:          #4a4a4a;
  --c-steel:          #6a6a6a;
  --c-stone:          #8a8a8a;
  --c-muted:          #a8a8a8;

  --c-hairline:        #e5e5e5;
  --c-hairline-soft:   #ededed;
  --c-hairline-strong: #c7c7c7;

  --c-canvas:         #ffffff;
  --c-surface:        #fafafa;
  --c-surface-cream:  #fff8e0;
  --c-surface-cream-soft: #fffaeb;
  --c-surface-code:   #1c1c1e;

  --c-on-cream:       #1f1f1f;
  --c-on-dark:        #ffffff;
  --c-on-dark-muted:  #a8a8a8;

  --c-link:           #fa520f;

  /* ----- spacing tokens ----- */
  --sp-xxs:  4px;
  --sp-xs:   8px;
  --sp-sm:  12px;
  --sp-md:  16px;
  --sp-lg:  20px;
  --sp-xl:  24px;
  --sp-xxl: 32px;
  --sp-xxxl: 40px;
  --sp-section-sm: 48px;
  --sp-section:    64px;
  --sp-section-lg: 96px;
  --sp-hero:      120px;

  /* ----- radius tokens ----- */
  --rad-xs:   4px;
  --rad-sm:   6px;
  --rad-md:   8px;
  --rad-lg:  12px;
  --rad-xl:  16px;
  --rad-xxl: 20px;
  --rad-full: 9999px;

  /* ----- shadow tokens ----- */
  --shadow-sm: 0 1px 2px rgba(31, 31, 31, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 40px rgba(31, 31, 31, 0.08);

  /* ----- type tokens ----- */
  --font-display: 'Cormorant Garamond', 'PP Editorial Old', 'Times New Roman', Georgia, serif;
  --font-sans:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-mono:    'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;

  --fs-hero:     84px;
  --fs-display:  64px;
  --fs-h1:       52px;
  --fs-h2:       36px;
  --fs-h3:       28px;
  --fs-h4:       22px;
  --fs-h5:       18px;
  --fs-subtitle: 18px;
  --fs-body:     16px;
  --fs-body-sm:  14px;
  --fs-caption:  13px;
  --fs-micro:    11px;
  --fs-button:   14px;
  --fs-stat:     56px;

  --lh-tight:   1.05;
  --lh-snug:    1.20;
  --lh-normal:  1.50;
  --lh-relaxed: 1.55;

  /* ----- layout ----- */
  --max-width: 1180px;

  /* ----- signature sunset gradient ----- */
  --gradient-sunset: linear-gradient(
    90deg,
    var(--c-primary) 0%,
    var(--c-sunshine-700) 35%,
    var(--c-yellow-saturated) 65%,
    var(--c-cream) 100%
  );
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-relaxed);
  color: var(--c-ink);
  background: var(--c-canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--c-link);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover { color: var(--c-primary-deep); }

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: var(--lh-snug);
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

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

/* ===== top bar ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid var(--c-hairline-soft);
  backdrop-filter: saturate(180%) blur(12px);
}
.topbar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--sp-md) var(--sp-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-xl);
}
.topbar .brand {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--fs-body);
  letter-spacing: -0.01em;
  color: var(--c-ink);
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
}
.topbar .brand:hover { color: var(--c-ink); }
.topbar .brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--c-primary);
  color: var(--c-on-primary);
  border-radius: var(--rad-md);
  font-weight: 700;
  font-size: var(--fs-body-sm);
}
.topbar nav {
  display: flex;
  gap: var(--sp-xl);
}
.topbar nav a {
  color: var(--c-slate);
  font-weight: 500;
  font-size: var(--fs-body-sm);
}
.topbar nav a:hover { color: var(--c-primary); }

/* ===== hero (personal intro) ===== */
.hero-intro {
  display: flex;
  gap: var(--sp-section);
  align-items: center;
  justify-content: center;
  text-align: left;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--sp-section-lg) var(--sp-xl) var(--sp-section);
}
.hero-intro .hero-text { max-width: 600px; }
.hero-intro .greeting {
  display: inline-block;
  padding: 6px 14px;
  background: var(--c-cream);
  border: 1px solid var(--c-beige-deep);
  border-radius: var(--rad-full);
  font-family: var(--font-sans);
  font-size: var(--fs-caption);
  font-weight: 500;
  color: var(--c-charcoal);
  margin-bottom: var(--sp-xl);
}
.hero-intro h1 {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 400;
  line-height: var(--lh-tight);
  letter-spacing: -1px;
  margin: 0 0 var(--sp-lg);
  color: var(--c-ink);
}
.hero-intro p.lead {
  font-family: var(--font-sans);
  font-size: var(--fs-subtitle);
  line-height: var(--lh-normal);
  color: var(--c-slate);
  margin: 0 0 var(--sp-xxl);
}
.hero-cta { margin: var(--sp-md) 0 0; }

.hero-photo {
  position: relative;
  width: 260px;
  height: 260px;
  flex-shrink: 0;
  border-radius: var(--rad-full);
  overflow: hidden;
  background: var(--c-cream);
  border: 1px solid var(--c-beige-deep);
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.hero-photo .photo-placeholder {
  position: absolute;
  color: var(--c-stone);
  font-family: var(--font-sans);
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.hero-photo img + .photo-placeholder { display: none; }
.hero-photo.no-photo .photo-placeholder { display: inline; }

/* ===== buttons ===== */
.btn-primary {
  display: inline-block;
  padding: 12px 22px;
  background: var(--c-primary);
  color: var(--c-on-primary);
  border: none;
  border-radius: var(--rad-md);
  font-family: var(--font-sans);
  font-size: var(--fs-button);
  font-weight: 500;
  line-height: 1.3;
  text-decoration: none;
  transition: background 0.15s ease;
}
.btn-primary:hover {
  background: var(--c-primary-deep);
  color: var(--c-on-primary);
}
.btn-secondary {
  display: inline-block;
  padding: 12px 22px;
  background: transparent;
  color: var(--c-ink);
  border: 1px solid var(--c-hairline-strong);
  border-radius: var(--rad-md);
  font-family: var(--font-sans);
  font-size: var(--fs-button);
  font-weight: 500;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
}
.btn-secondary:hover {
  background: var(--c-surface-cream-soft);
  border-color: var(--c-beige-deep);
  color: var(--c-ink);
}

/* ===== sections ===== */
section.block {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--sp-section-lg) var(--sp-xl);
}
section.block h2 {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 500;
  letter-spacing: -0.5px;
  margin: 0 0 var(--sp-sm);
}
section.block .sub {
  font-family: var(--font-sans);
  color: var(--c-steel);
  max-width: 640px;
  margin: 0 0 var(--sp-xxl);
  font-size: var(--fs-subtitle);
}

/* ===== project cards ===== */
.projects {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--sp-xl);
}
.project {
  display: block;
  background: var(--c-canvas);
  border: 1px solid var(--c-hairline-soft);
  border-radius: var(--rad-lg);
  padding: var(--sp-xxl);
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s;
  color: inherit;
  text-decoration: none;
}
.project:hover {
  border-color: var(--c-primary);
  box-shadow: var(--shadow-md);
  color: inherit;
}
.project.coming-soon { background: var(--c-surface); }
.project.coming-soon:hover { border-color: var(--c-hairline-strong); }

.project .proj-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--rad-md);
  background: var(--c-cream);
  color: var(--c-primary);
  font-weight: 700;
  font-size: var(--fs-body);
  margin-bottom: var(--sp-md);
  letter-spacing: -0.02em;
  border: 1px solid var(--c-beige-deep);
}
.project.coming-soon .proj-icon {
  background: var(--c-surface);
  color: var(--c-stone);
  border-color: var(--c-hairline);
}
.project h3 {
  font-family: var(--font-display);
  margin: 0 0 var(--sp-xs);
  font-size: var(--fs-h4);
  font-weight: 500;
  color: var(--c-ink);
}
.project p {
  font-family: var(--font-sans);
  color: var(--c-slate);
  font-size: var(--fs-body-sm);
  margin: 0 0 var(--sp-md);
  line-height: var(--lh-normal);
}
.project .proj-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--sp-md);
  padding-top: var(--sp-md);
  border-top: 1px solid var(--c-hairline-soft);
  font-family: var(--font-sans);
  font-size: var(--fs-caption);
}
.project .proj-meta .status {
  color: var(--c-primary);
  font-weight: 600;
}
.project.coming-soon .proj-meta .status { color: var(--c-stone); }
.project .proj-meta .arrow {
  color: var(--c-ink);
  font-weight: 500;
}
.project.coming-soon .proj-meta .arrow { color: var(--c-stone); }

/* ===== about block ===== */
.about {
  background: var(--c-cream);
  padding: var(--sp-section-lg) var(--sp-xl);
  border-top: 1px solid var(--c-beige-deep);
}
.about-inner {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}
.about h2 {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 500;
  letter-spacing: -0.5px;
  margin: 0 0 var(--sp-md);
}
.about p {
  font-family: var(--font-sans);
  color: var(--c-charcoal);
  margin: 0 auto var(--sp-sm);
  max-width: 620px;
  font-size: var(--fs-subtitle);
  line-height: var(--lh-normal);
}

/* ===== sunset stripe (signature gradient band) ===== */
.sunset-stripe {
  height: 64px;
  background: var(--gradient-sunset);
}

/* ===== footer ===== */
footer {
  border-top: 1px solid var(--c-hairline-soft);
  padding: var(--sp-xxl) var(--sp-xl);
  text-align: center;
  color: var(--c-stone);
  font-size: var(--fs-caption);
  background: var(--c-canvas);
}
footer a { color: var(--c-steel); }

.hint-aside {
  font-size: var(--fs-caption);
  color: var(--c-stone);
  margin-top: var(--sp-xl);
}

/* ===== coming-soon page (legacy) ===== */
.cs-wrap {
  max-width: 640px;
  margin: var(--sp-section-lg) auto;
  padding: var(--sp-xxxl) var(--sp-xl);
  text-align: center;
}
.cs-wrap h1 {
  font-family: var(--font-display);
  font-size: var(--fs-display);
  font-weight: 400;
  letter-spacing: -1px;
  margin: 0 0 var(--sp-md);
}
.cs-wrap p {
  color: var(--c-slate);
  font-size: var(--fs-subtitle);
}
.cs-wrap .back-link {
  display: inline-block;
  margin-top: var(--sp-xl);
  padding: 10px 22px;
  border: 1px solid var(--c-hairline-strong);
  border-radius: var(--rad-md);
  color: var(--c-ink);
  font-weight: 500;
}
.cs-wrap .back-link:hover { background: var(--c-surface-cream-soft); }

/* ===== responsive ===== */
@media (max-width: 820px) {
  .hero-intro {
    flex-direction: column;
    text-align: center;
    padding: var(--sp-section) var(--sp-md) var(--sp-section-sm);
    gap: var(--sp-xxl);
  }
  .hero-intro .hero-text { text-align: center; }
  .hero-intro h1 { text-align: center; }
  .hero-intro p.lead { text-align: center; }
  .hero-photo { width: 180px; height: 180px; }
  .topbar nav { gap: var(--sp-md); }
  section.block { padding: var(--sp-section) var(--sp-md); }
}