/*
 * Design Alignment: Strict Anti-AI Constraints
 * - Fonts: Geist, Geist Mono (No Inter/Roboto/Arial/Helvetica)
 * - Zero gradients. Flat solid colors with physical warmth.
 * - Micro-grain texture via feTurbulence SVG data URI.
 * - Concentric radius rule: Inner Radius = Outer Radius - Gap.
 * - Sentence case headings and buttons.
 * - Balanced text wrapping on headings, pretty wrapping on paragraphs.
 */

:root {
  /* Physical Warm Dark Palette (Default) */
  --bg-canvas: #141312;
  --bg-surface: #1b1a18;
  --bg-surface-hover: #23221f;
  --bg-surface-active: #2a2824;
  --bg-surface-sunken: #0f0e0d;

  --border-strong: #383530;
  --border-default: #282622;
  --border-subtle: #1f1d1a;

  --text-primary: #eeeae2;
  --text-secondary: #a39c91;
  --text-tertiary: #6b665e;
  --text-inverse: #141312;

  --accent: #d9532f;
  --accent-hover: #e8633e;
  --accent-surface: #2b1812;
  --accent-border: #52271c;
  --accent-contrast: #ffffff;

  --status-prod: #3d7d52;
  --status-prod-bg: #142419;
  --status-active: #c67d19;
  --status-active-bg: #2b1f10;
  --status-oss: #3f6e9c;
  --status-oss-bg: #14212e;

  /* Typography */
  --font-sans: 'Geist', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Logical Sizing & Spacing Scale */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */

  /* Concentric Radius System */
  /* Outer container: 12px; with 8px padding/gap, inner child: 4px */
  --radius-outer: 12px;
  --gap-standard: 8px;
  --radius-inner: calc(var(--radius-outer) - var(--gap-standard)); /* 4px */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Texture grain opacity */
  --grain-opacity: 0.16;

  /* Light source aligned flat shadow */
  --shadow-flat: 0 4px 0 0 #0a0a09;
}

[data-theme="light"] {
  --bg-canvas: #f6f4ef;
  --bg-surface: #ede9df;
  --bg-surface-hover: #e3dece;
  --bg-surface-active: #dad4c2;
  --bg-surface-sunken: #f0ece3;

  --border-strong: #c8c0b0;
  --border-default: #ddd6c8;
  --border-subtle: #e6e0d4;

  --text-primary: #1d1b18;
  --text-secondary: #635d53;
  --text-tertiary: #968f83;
  --text-inverse: #f6f4ef;

  --accent: #c44322;
  --accent-hover: #b03a1b;
  --accent-surface: #faeae5;
  --accent-border: #f0c3b6;
  --accent-contrast: #ffffff;

  --status-prod: #27683b;
  --status-prod-bg: #e3f2e8;
  --status-active: #9c5e0e;
  --status-active-bg: #faeedb;
  --status-oss: #2c5982;
  --status-oss-bg: #e2eef8;

  --grain-opacity: 0.06;
  --shadow-flat: 0 4px 0 0 #cfc7b6;
}

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

/* Screen-reader-only utility */
.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;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-canvas);
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100dvh;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  position: relative;
  overflow-x: hidden;
}

/* Film Grain Texture Overlay */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  opacity: var(--grain-opacity);
  mix-blend-mode: overlay;
  z-index: 10;
}

/* Typography Constraints */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.25;
  color: var(--text-primary);
  text-wrap: balance;
}

h1 {
  font-size: 2.25rem;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1.125rem;
  letter-spacing: -0.01em;
}

p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  text-wrap: pretty;
}

/* Absolute ban on italics: boost weight by 1 step */
em, i {
  font-style: normal;
  font-weight: 500;
  color: var(--text-primary);
}

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

button, input, select {
  font-family: inherit;
  font-size: inherit;
}

code, pre, kbd {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

/* Structural Layout Shell */
.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-16);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

@media (max-width: 640px) {
  .app-shell {
    padding: var(--space-6) var(--space-4) var(--space-12);
  }
}

/* Header Section (Asymmetric, Left-offset) */
.header-band {
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--border-default);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-2);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--status-prod);
}

.site-title {
  margin-bottom: var(--space-2);
}

.site-intro {
  max-width: 640px;
  font-size: 1rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.theme-toggle-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8125rem;
  font-weight: 500;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

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

/* Controls Bar: Search, Category Filters, View Switcher */
.controls-bar {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.controls-row-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.search-box {
  position: relative;
  flex: 1;
  min-width: 260px;
  max-width: 480px;
}

.search-icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}

.search-input {
  width: 100%;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-4) var(--space-2) 2.25rem;
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: border-color 0.15s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
}

.search-input::placeholder {
  color: var(--text-tertiary);
}

.view-controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.view-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8125rem;
  font-weight: 500;
}

.view-btn.active {
  background: var(--bg-surface-active);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.view-btn:hover:not(.active) {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}

/* Category Filter Tabs */
.filter-pills-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}

.filter-pill {
  background: var(--bg-surface-sunken);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  padding: 0.3125rem 0.625rem;
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.filter-pill:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}

.filter-pill.active {
  background: var(--accent-surface);
  color: var(--accent);
  border-color: var(--accent-border);
}

.stats-counter {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

@media (max-width: 768px) {
  .stats-counter {
    width: 100%;
    margin-left: 0;
    margin-top: var(--space-1);
  }
}

/* ==========================================================================
   BENTO GRID VIEW (Asymmetrical, Locked Alignment)
   ========================================================================== */
.projects-bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  align-items: stretch;
}

@media (max-width: 1024px) {
  .projects-bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 680px) {
  .projects-bento-grid {
    grid-template-columns: 1fr;
  }
}

.col-span-1 {
  grid-column: span 1;
}

.col-span-2 {
  grid-column: span 2;
}

@media (max-width: 680px) {
  .col-span-2 {
    grid-column: span 1;
  }
}

/* Project Bento Card - Concentric radius & Flat Surface Discipline */
.project-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-outer);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.project-card:hover {
  border-color: var(--border-strong);
  background-color: var(--bg-surface-hover);
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.card-meta-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}

/* Concentric radius: inner chip = outer 12px - 8px gap = 4px */
.status-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 6px;
  border-radius: var(--radius-inner);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.status-tag.production {
  background: var(--status-prod-bg);
  color: var(--status-prod);
}

.status-tag.active {
  background: var(--status-active-bg);
  color: var(--status-active);
}

.status-tag.open-source {
  background: var(--status-oss-bg);
  color: var(--status-oss);
}

.category-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.year-stamp {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.card-title-group {
  margin-bottom: var(--space-3);
}

.project-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.project-tagline {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.project-description {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: var(--space-4);
}

/* Organic Metrics Strip */
.metrics-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: var(--space-2);
  background: var(--bg-surface-sunken);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-inner);
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-4);
}

.metric-item {
  display: flex;
  flex-direction: column;
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.metric-label {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  white-space: nowrap;
}

/* Tech Stack Chips */
.stack-chips-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-5);
}

.stack-chip {
  background: var(--bg-surface-sunken);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  border-radius: var(--radius-inner);
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
}

/* Code and Terminal Bleed Blocks in Bento */
.terminal-block, .code-block {
  background: var(--bg-surface-sunken);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-inner);
  padding: var(--space-3);
  margin-bottom: var(--space-4);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.terminal-block pre, .code-block pre {
  white-space: pre-wrap;
  word-break: break-word;
}

/* Card Footer: Level across columns with mt-auto */
.card-footer {
  margin-top: auto;
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.card-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-inner);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
  border: 1px solid transparent;
}

.action-btn.primary {
  background-color: var(--accent-surface);
  color: var(--accent);
  border-color: var(--accent-border);
}

.action-btn.primary:hover {
  background-color: var(--accent);
  color: var(--accent-contrast);
}

.action-btn.secondary {
  background-color: var(--bg-surface-sunken);
  color: var(--text-secondary);
  border-color: var(--border-subtle);
}

.action-btn.secondary:hover {
  background-color: var(--bg-surface-active);
  color: var(--text-primary);
  border-color: var(--border-default);
}

.btn-icon-only {
  padding: var(--space-2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ==========================================================================
   LEDGER / TABLE ROW VIEW (Dense Engineering Index)
   ========================================================================== */
.projects-ledger-view {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-outer);
  overflow: hidden;
  background-color: var(--bg-surface);
}

.ledger-header {
  display: grid;
  grid-template-columns: 48px 2.5fr 1.2fr 1.8fr 80px 140px;
  padding: var(--space-3) var(--space-4);
  background-color: var(--bg-surface-sunken);
  border-bottom: 1px solid var(--border-default);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
}

.ledger-row {
  display: grid;
  grid-template-columns: 48px 2.5fr 1.2fr 1.8fr 80px 140px;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  align-items: center;
  transition: background-color 0.15s ease;
  font-size: 0.8125rem;
}

.ledger-row:last-child {
  border-bottom: none;
}

.ledger-row:hover {
  background-color: var(--bg-surface-hover);
}

.ledger-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.ledger-main {
  display: flex;
  flex-direction: column;
  padding-right: var(--space-3);
}

.ledger-title {
  font-weight: 600;
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.ledger-tagline {
  font-size: 0.75rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ledger-category {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.ledger-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.ledger-year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.ledger-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-1);
}

@media (max-width: 860px) {
  .ledger-header {
    display: none;
  }
  .ledger-row {
    grid-template-columns: 36px 1fr auto;
    gap: var(--space-2);
    padding: var(--space-3);
  }
  .ledger-category, .ledger-stack, .ledger-year {
    display: none;
  }
}

/* ==========================================================================
   TECHNICAL DOSSIER MODAL / DRAWER
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(10, 9, 8, 0.75);
  backdrop-filter: blur(2px);
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-dialog {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-outer);
  width: 100%;
  max-width: 680px;
  max-height: 88dvh;
  overflow-y: auto;
  padding: var(--space-6);
  position: relative;
  box-shadow: var(--shadow-flat);
  transform: translateY(12px);
  transition: transform 0.2s ease;
}

.modal-backdrop.open .modal-dialog {
  transform: translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background: var(--bg-surface-sunken);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  border-radius: var(--radius-inner);
  padding: var(--space-2);
  cursor: pointer;
  display: inline-flex;
}

.modal-close-btn:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}

.modal-section-title {
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
}

.highlights-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.highlights-list li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  position: relative;
  padding-left: var(--space-4);
  line-height: 1.5;
}

.highlights-list li::before {
  content: "■";
  position: absolute;
  left: 0;
  top: 0.2rem;
  font-size: 0.5rem;
  color: var(--accent);
}

.clone-box {
  background: var(--bg-surface-sunken);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-inner);
  padding: var(--space-2) var(--space-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.clone-command {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-primary);
  overflow-x: auto;
  white-space: nowrap;
}

/* Empty State */
.empty-state {
  text-align: left;
  padding: var(--space-12) var(--space-6);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-outer);
}

.empty-state h3 {
  margin-bottom: var(--space-2);
}

/* Footer Section */
.site-footer {
  margin-top: auto;
  padding-top: var(--space-10);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

.footer-left {
  font-family: var(--font-mono);
}

.footer-links {
  display: flex;
  gap: var(--space-4);
}

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