/* ============================================================
   THE SURVEYOR'S CATALOG — Design System
   Fraunces (display serif) + Outfit (geometric sans)
   OKLCH palette — warm charcoal, terracotta accent
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300..900;1,9..144,300..900&family=Outfit:wght@300;400;500;600&display=swap');

/* ── Tokens ─────────────────────────────────────────────── */
:root {
  /* Surfaces — warm charcoal tinted toward ochre (hue 55) */
  --surface-base:    oklch(14% 0.01 55);
  --surface-raised:  oklch(18% 0.015 55);
  --surface-border:  oklch(26% 0.015 55);
  --surface-rule:    oklch(22% 0.012 55);

  /* Text — warm off-whites, never pure white */
  --text-primary:    oklch(88% 0.01 55);
  --text-secondary:  oklch(63% 0.015 55);
  --text-tertiary:   oklch(54% 0.012 55);

  /* Accent — terracotta/rust (rotated each session by app.js) */
  --accent-hue:      30;
  --accent:          oklch(58% 0.14 var(--accent-hue));
  --accent-dim:      oklch(58% 0.07 var(--accent-hue));
  --accent-subtle:   oklch(20% 0.03 var(--accent-hue));

  /* Typography */
  --font-display:    'Fraunces', 'Georgia', serif;
  --font-body:       'Outfit', 'Segoe UI', system-ui, sans-serif;

  /* Type scale — perfect fourth (1.333) */
  --text-xs:         clamp(0.65rem, 0.6rem + 0.25vw, 0.72rem);
  --text-sm:         clamp(0.78rem, 0.72rem + 0.3vw, 0.875rem);
  --text-base:       clamp(0.95rem, 0.88rem + 0.35vw, 1.05rem);
  --text-lg:         clamp(1.1rem, 1rem + 0.5vw, 1.3rem);
  --text-xl:         clamp(1.4rem, 1.2rem + 1vw, 1.8rem);
  --text-2xl:        clamp(1.9rem, 1.5rem + 2vw, 2.6rem);
  --text-display:    clamp(2.4rem, 1.8rem + 3vw, 3.8rem);

  /* Spacing — 4pt base */
  --sp-1:   4px;
  --sp-2:   8px;
  --sp-3:   12px;
  --sp-4:   16px;
  --sp-5:   20px;
  --sp-6:   24px;
  --sp-8:   32px;
  --sp-10:  40px;
  --sp-12:  48px;
  --sp-16:  64px;
  --sp-20:  80px;
  --sp-24:  96px;

  /* Easing — exponential curves only (no bounce) */
  --ease-out:   cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:    cubic-bezier(0.7, 0, 0.84, 0);
  --ease-inout: cubic-bezier(0.65, 0, 0.35, 1);
}

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

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

body {
  background-color: var(--surface-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.65;
  min-height: 100vh;
  /* Subtle warm paper texture via repeating gradient */
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 47px,
      oklch(16% 0.01 55 / 0.4) 47px,
      oklch(16% 0.01 55 / 0.4) 48px
    );
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
ul, ol { list-style: none; }

/* ── Layout container ────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: var(--sp-6);
}

@media (min-width: 768px) {
  .container { padding-inline: var(--sp-10); }
  .filter-tabs { padding-inline: var(--sp-10); }
}

/* ── Header ──────────────────────────────────────────────── */
.site-header {
  padding-block: var(--sp-16) var(--sp-12);
  border-bottom: 1px solid var(--surface-rule);
}

.header-eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--sp-4);
  font-variant-numeric: tabular-nums;
}

.header-name {
  font-family: var(--font-display);
  font-size: var(--text-display);
  font-weight: 700;
  font-optical-sizing: auto;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: var(--sp-4);
}

.header-tagline {
  font-size: var(--text-lg);
  font-weight: 300;
  color: var(--text-secondary);
  max-width: 58ch;
  margin-bottom: var(--sp-8);
  line-height: 1.5;
}

/* ── Header: credential stats strip ──────────────────────── */
.header-stats {
  margin-bottom: var(--sp-8);
  padding-top: var(--sp-2);
  line-height: 1.8;
}

.header-stat {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  display: inline;
}

.header-stat + .header-stat::before {
  content: ' · ';
  color: var(--text-tertiary);
  padding-inline: var(--sp-1);
}

.header-stat strong {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  font-optical-sizing: auto;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.header-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-6);
  align-items: center;
}

.header-link {
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  transition: color 200ms var(--ease-out);
  position: relative;
  padding-block: var(--sp-1);
  min-height: 44px;
  display: flex;
  align-items: center;
}

.header-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 200ms var(--ease-out);
}

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

.header-link:hover::after {
  width: 100%;
}

.header-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.header-link--portfolio {
  color: var(--accent);
  font-weight: 500;
}

/* ── Filter bar ──────────────────────────────────────────── */
.filter-bar {
  padding-block: var(--sp-6);
  border-bottom: 1px solid var(--surface-rule);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.filter-bar::-webkit-scrollbar { display: none; }

.filter-tabs {
  display: flex;
  gap: var(--sp-2);
  align-items: center;
  min-width: max-content;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: var(--sp-6);
}

.filter-tab {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.03em;
  color: var(--text-tertiary);
  padding: var(--sp-2) var(--sp-4);
  border-radius: 2px;
  position: relative;
  transition: color 150ms var(--ease-out);
  white-space: nowrap;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.filter-tab::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--sp-4);
  right: var(--sp-4);
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 200ms var(--ease-out);
}

.filter-tab:hover {
  color: var(--text-secondary);
}

.filter-tab.active {
  color: var(--text-primary);
  font-weight: 500;
}

.filter-tab.active::after {
  transform: scaleX(1);
}

.filter-tab:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ── Project count ───────────────────────────────────────── */
.project-count {
  padding-block: var(--sp-5);
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--text-tertiary);
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
  border-bottom: 1px solid var(--surface-rule);
}

/* ── Project grid ────────────────────────────────────────── */
.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  grid-auto-flow: dense;
  gap: 0;
  padding-block: var(--sp-6) var(--sp-24);
  overflow: hidden;
}

@media (min-width: 700px) {
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ── Project entry ───────────────────────────────────────── */
.project-entry {
  position: relative;
  padding: var(--sp-8) var(--sp-6) var(--sp-8);
  border-bottom: 1px solid var(--surface-rule);
  border-right: 1px solid var(--surface-rule);
  transition: background-color 200ms var(--ease-out);
  /* Stagger animation — --i set by app.js */
  opacity: 0;
  transform: translateY(12px);
  animation: entry-in 500ms var(--ease-out) forwards;
  animation-delay: calc(var(--i, 0) * 50ms);
}

.project-entry:hover,
.project-entry.expanded {
  background-color: var(--surface-raised);
}

.project-entry:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -3px;
  z-index: 1;
}

/* Featured entries span 2 columns on wide screens */
.project-entry.featured {
  grid-column: span 1;
}

@media (min-width: 900px) {
  .project-entry.featured {
    grid-column: span 2;
  }
}

/* Hidden entries (filtered out) */
.project-entry.hidden {
  display: none;
}

/* ── Entry: header row (figure + status badge) ───────────── */
.entry-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--sp-4);
}

/* ── Entry: figure number ────────────────────────────────── */
.entry-figure {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  font-variant-caps: all-small-caps;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.12em;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex: 1;
}

.entry-figure::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--surface-border);
}

/* ── Entry: status badge ─────────────────────────────────── */
.entry-status {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  font-variant-caps: all-small-caps;
  padding: 2px var(--sp-2);
  border-radius: 2px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-left: var(--sp-3);
}

.entry-status--live {
  color: oklch(65% 0.16 155);
  border: 1px solid oklch(65% 0.16 155 / 0.35);
  background: oklch(65% 0.16 155 / 0.08);
}

.entry-status--active {
  color: var(--text-tertiary);
  border: 1px solid var(--surface-border);
}

.entry-status--archive {
  color: var(--text-tertiary);
  opacity: 0.55;
  border: 1px solid var(--surface-border);
}

/* ── Entry: image ────────────────────────────────────────── */
.entry-image-wrap {
  overflow: hidden;
  margin-bottom: var(--sp-5);
  background-color: var(--surface-raised);
}

.entry-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: top;
  display: block;
  /* Desaturated until hover/expanded — image tells story on interaction */
  filter: saturate(0.55) brightness(0.95);
  transition: filter 250ms var(--ease-out), transform 350ms var(--ease-out);
}

.project-entry:hover .entry-image,
.project-entry.expanded .entry-image {
  filter: saturate(1) brightness(1);
  transform: scale(1.015);
}

/* Placeholder for entries with no image */
.entry-image-placeholder {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: var(--sp-6);
  background-color: var(--surface-raised);
  margin-bottom: var(--sp-5);
}

.placeholder-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-tertiary);
  line-height: 1.1;
  font-optical-sizing: auto;
}

/* ── Entry: category ─────────────────────────────────────── */
.entry-category {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  font-variant-caps: all-small-caps;
  letter-spacing: 0.12em;
  /* color set inline by app.js via oklch(58% 0.12 <hue>) */
  margin-bottom: var(--sp-2);
}

/* ── Entry: title ────────────────────────────────────────── */
.entry-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  font-optical-sizing: auto;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin-bottom: var(--sp-3);
  transition: color 150ms var(--ease-out);
}

.project-entry:hover .entry-title,
.project-entry.expanded .entry-title {
  color: var(--accent);
}

/* ── Entry: tagline ──────────────────────────────────────── */
.entry-tagline {
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.55;
  max-width: 54ch;
}

/* ── Entry: tech preview (always visible) ────────────────── */
.entry-tech-preview {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: var(--sp-3);
}

/* ── Entry: expanded details ─────────────────────────────── */
.entry-details {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 300ms var(--ease-out);
  margin-top: var(--sp-4);
}

.project-entry:hover .entry-details,
.project-entry.expanded .entry-details {
  grid-template-rows: 1fr;
}

.entry-details-inner {
  overflow: hidden;
}

.entry-description {
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 60ch;
  padding-top: var(--sp-4);
  margin-bottom: var(--sp-5);
}

/* Tech tags */
.entry-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-bottom: var(--sp-5);
}

.tech-tag {
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--text-tertiary);
  padding: var(--sp-1) var(--sp-3);
  border: 1px solid var(--surface-border);
  border-radius: 2px;
}

/* Action links */
.entry-actions {
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
}

.entry-action {
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.04em;
  padding: var(--sp-2) var(--sp-5);
  border-radius: 2px;
  transition: background-color 150ms var(--ease-out), color 150ms var(--ease-out), border-color 150ms var(--ease-out);
  min-height: 44px;
  display: flex;
  align-items: center;
}

.entry-action--primary {
  background-color: var(--accent);
  color: var(--surface-base);
  font-weight: 500;
}

.entry-action--primary:hover {
  background-color: oklch(65% 0.14 var(--accent-hue));
}

.entry-action--secondary {
  border: 1px solid var(--surface-border);
  color: var(--text-secondary);
}

.entry-action--secondary:hover {
  border-color: var(--accent-dim);
  color: var(--text-primary);
}

.entry-action:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ── OSS Contributions ───────────────────────────────────── */
.oss-section {
  padding-block: var(--sp-12) var(--sp-16);
  border-top: 1px solid var(--surface-rule);
}

.oss-heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  font-optical-sizing: auto;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin-bottom: var(--sp-3);
}

.oss-subheading {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--sp-8);
  max-width: 50ch;
}

.oss-groups {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-10);
}

@media (max-width: 640px) {
  .oss-groups { grid-template-columns: 1fr; }
}

.oss-group-label {
  font-size: var(--text-xs);
  font-weight: 500;
  font-variant-caps: all-small-caps;
  letter-spacing: 0.12em;
  color: var(--text-tertiary);
  margin-bottom: var(--sp-4);
}

.oss-pr-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.oss-pr {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  padding-block: var(--sp-2);
  border-bottom: 1px solid var(--surface-rule);
  transition: color 150ms var(--ease-out);
  min-height: 44px;
}

.oss-pr:hover {
  color: var(--text-primary);
}

.oss-pr:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.oss-pr-repo {
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
}

.oss-pr-num {
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  font-size: var(--text-xs);
}

.oss-pr-title {
  color: var(--text-tertiary);
  font-size: var(--text-xs);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.oss-status-merged { color: oklch(60% 0.15 155); } /* green */
.oss-status-review { color: oklch(70% 0.12 75); }  /* amber */

/* ── Footer ──────────────────────────────────────────────── */
.site-footer {
  padding-block: var(--sp-8);
  border-top: 1px solid var(--surface-rule);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-4);
}

.footer-copy {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  letter-spacing: 0.04em;
}

.footer-note {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
}

/* ── Utilities ───────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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