/* ==========================================================================
   Aariv Patel Personal Site // Swiss Drafting-Table CSS Architecture
   Zero external dependencies. Custom Dark Draft & Daylight Paper themes.
   ========================================================================== */

:root,
[data-theme="dark"] {
  --bg-surface: #0b0f17;
  --bg-elevated: #111826;
  --bg-card-hover: #162032;
  --bg-header: rgba(11, 15, 23, 0.88);
  --text-primary: #f4f1ea;
  --text-secondary: #a8b3c5;
  --text-muted: #6e7b91;
  --border-grid: #1e293b;
  --border-strong: #334155;
  --accent-vermilion: #e05a2b;
  --accent-vermilion-soft: rgba(224, 90, 43, 0.14);
  --accent-blueprint: #38bdf8;
  --accent-blueprint-soft: rgba(56, 189, 248, 0.12);
  --accent-emerald: #10b981;
  --grid-dot: rgba(148, 163, 184, 0.08);
  --grid-line: rgba(56, 189, 248, 0.035);
  --shadow-card: 0 10px 28px -8px rgba(0, 0, 0, 0.55);
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Monaco, Consolas, monospace;
}

[data-theme="light"] {
  --bg-surface: #f5f2eb;
  --bg-elevated: #ebe6dc;
  --bg-card-hover: #e2dcd0;
  --bg-header: rgba(245, 242, 235, 0.9);
  --text-primary: #141821;
  --text-secondary: #3e4859;
  --text-muted: #647084;
  --border-grid: #d5cfc3;
  --border-strong: #b5ae9f;
  --accent-vermilion: #c94618;
  --accent-vermilion-soft: rgba(201, 70, 24, 0.11);
  --accent-blueprint: #0369a1;
  --accent-blueprint-soft: rgba(3, 105, 161, 0.1);
  --accent-emerald: #059669;
  --grid-dot: rgba(20, 24, 33, 0.09);
  --grid-line: rgba(3, 105, 161, 0.045);
  --shadow-card: 0 8px 22px -6px rgba(20, 24, 33, 0.08);
}

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

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

body {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* Blueprint drafting grid backdrop */
.blueprint-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px),
    radial-gradient(circle, var(--grid-dot) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px, 24px 24px;
}

/* Top Drafting Bar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-header);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-grid);
}

.header-inner {
  max-width: 1220px;
  margin: 0 auto;
  padding: 0.7rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
}

.monogram {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 6px;
  background: var(--bg-elevated);
  border: 2px solid var(--accent-vermilion);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.brand-meta {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.brand-sheet {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  border-radius: 5px;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.86rem;
  font-weight: 500;
  border: 1px solid transparent;
  transition: all 0.15s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--bg-elevated);
  border-color: var(--border-grid);
}

.nav-key {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.05rem 0.35rem;
  border-radius: 3px;
  background: var(--accent-vermilion-soft);
  color: var(--accent-vermilion);
  font-weight: 600;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.coord-readout {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--text-muted);
  background: var(--bg-elevated);
  border: 1px solid var(--border-grid);
  padding: 0.35rem 0.65rem;
  border-radius: 5px;
  font-variant-numeric: tabular-nums;
}

.coord-readout strong {
  color: var(--accent-blueprint);
  font-weight: 600;
}

.coord-scale {
  padding-left: 0.5rem;
  border-left: 1px solid var(--border-grid);
  color: var(--text-muted);
}

.theme-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  padding: 0.38rem 0.7rem;
  border-radius: 5px;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.1s ease;
}

.theme-btn:hover {
  border-color: var(--accent-vermilion);
}

.theme-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-vermilion);
}

kbd {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  color: var(--text-secondary);
}

/* Main Drafting Sheet Layout */
.drafting-board {
  position: relative;
  z-index: 1;
  max-width: 1220px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 4rem;
}

.sheet-section {
  display: grid;
  grid-template-columns: 140px 1fr;
  border: 1px solid var(--border-grid);
  background: rgba(17, 24, 38, 0.32);
  margin-bottom: 2rem;
  border-radius: 6px;
}

[data-theme="light"] .sheet-section {
  background: rgba(235, 230, 220, 0.45);
}

.section-rail {
  border-right: 1px solid var(--border-grid);
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  font-family: var(--font-mono);
  background: var(--bg-elevated);
}

.rail-index {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-vermilion);
  line-height: 1;
}

.rail-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  margin-top: 1.5rem;
}

.section-body {
  padding: 1.75rem 2rem;
}

/* Section 01: Hero & Spec Card */
.hero-grid {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 1.75rem;
  align-items: stretch;
}

.spec-pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.spec-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  color: var(--text-secondary);
}

.dot.live {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
}

.hero-title {
  font-size: clamp(1.75rem, 2.8vw, 2.45rem);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.hero-lead {
  font-size: 1.02rem;
  color: var(--text-secondary);
  margin-bottom: 1.35rem;
  max-width: 64ch;
}

.hero-lead strong {
  color: var(--text-primary);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.58rem 1.05rem;
  border-radius: 5px;
  font-size: 0.86rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.15s ease;
}

.btn-primary {
  background: var(--accent-vermilion);
  color: #ffffff;
  border: 1px solid var(--accent-vermilion);
}

.btn-primary:hover {
  filter: brightness(1.1);
}

.btn-outline {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

.btn-outline:hover {
  border-color: var(--accent-blueprint);
  color: var(--accent-blueprint);
}

/* Technical Monogram Card */
.hero-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  padding: 1.1rem 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.monogram-display {
  background: var(--bg-surface);
  border: 1px solid var(--border-grid);
  border-radius: 4px;
  padding: 0.5rem;
  margin-bottom: 0.9rem;
}

.monogram-svg {
  width: 100%;
  height: 96px;
  display: block;
}

.guide-line {
  stroke: var(--border-grid);
  stroke-width: 1;
  stroke-dasharray: 3 3;
}

.geo-stroke {
  fill: none;
  stroke: var(--text-primary);
  stroke-width: 8;
  stroke-linecap: square;
}

.geo-fill {
  fill: var(--accent-vermilion);
}

.svg-dim {
  fill: var(--accent-blueprint);
  font-family: var(--font-mono);
  font-size: 9px;
}

.spec-list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.spec-row {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.8rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px dashed var(--border-grid);
}

.spec-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.spec-row dt {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.72rem;
}

.spec-row dd {
  color: var(--text-primary);
  font-weight: 600;
  text-align: right;
}

/* Metrics Strip */
.metrics-strip {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-grid);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.metric-cell {
  background: var(--bg-elevated);
  border: 1px solid var(--border-grid);
  border-radius: 5px;
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.metric-num {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--accent-blueprint);
}

.metric-caption {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.35;
}

/* Section Headers & Filters */
.section-header-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-grid);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-vermilion);
  letter-spacing: 0.08em;
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.section-title {
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  max-width: 52ch;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.filter-chip {
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-grid);
  padding: 0.38rem 0.75rem;
  border-radius: 5px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.15s ease;
}

.filter-chip:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.filter-chip.active {
  background: var(--accent-vermilion-soft);
  color: var(--accent-vermilion);
  border-color: var(--accent-vermilion);
}

.chip-count {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  opacity: 0.85;
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.15rem;
}

.project-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-grid);
  border-radius: 6px;
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.project-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-blueprint);
  box-shadow: var(--shadow-card);
}

.project-card[hidden] {
  display: none !important;
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.65rem;
}

.card-id {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
}

.card-tag {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  padding: 0.15rem 0.45rem;
  border-radius: 3px;
  background: var(--accent-blueprint-soft);
  color: var(--accent-blueprint);
  font-weight: 600;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.45rem;
  color: var(--text-primary);
}

.card-desc {
  font-size: 0.86rem;
  color: var(--text-secondary);
  margin-bottom: 0.85rem;
}

.card-specs {
  list-style: none;
  margin-bottom: 1.1rem;
  border-top: 1px dashed var(--border-grid);
  padding-top: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.card-specs li {
  font-size: 0.78rem;
  color: var(--text-secondary);
  position: relative;
  padding-left: 0.85rem;
}

.card-specs li::before {
  content: "+";
  position: absolute;
  left: 0;
  color: var(--accent-vermilion);
  font-family: var(--font-mono);
  font-weight: 700;
}

.card-links {
  display: flex;
  gap: 0.55rem;
  margin-top: auto;
}

.card-link {
  flex: 1;
  text-align: center;
  padding: 0.42rem 0.6rem;
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  background: var(--bg-surface);
  transition: all 0.15s ease;
}

.card-link.primary {
  background: var(--accent-vermilion-soft);
  border-color: var(--accent-vermilion);
  color: var(--accent-vermilion);
}

.card-link:hover {
  border-color: var(--accent-blueprint);
  color: var(--accent-blueprint);
}

/* Section 03: Design, Speaking & Tabla */
.craft-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.15rem;
}

.craft-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-grid);
  border-radius: 6px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.craft-index {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-vermilion);
  font-weight: 600;
}

.craft-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
}

.craft-card p {
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.craft-meta {
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-grid);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Tabla Tintal Visualizer */
.tala-visualizer {
  margin-top: auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: 5px;
  padding: 0.75rem;
}

.tala-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.55rem;
}

.tala-title {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--accent-blueprint);
  font-weight: 600;
}

.tala-btn {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  cursor: pointer;
}

.tala-btn:hover {
  border-color: var(--accent-vermilion);
}

.tala-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 0.28rem;
  margin-bottom: 0.5rem;
}

.matra {
  background: var(--bg-elevated);
  border: 1px solid var(--border-grid);
  border-radius: 3px;
  padding: 0.2rem 0.1rem;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.matra em {
  font-style: normal;
  font-size: 0.58rem;
  color: var(--text-secondary);
}

.matra.active {
  background: var(--accent-vermilion-soft);
  border-color: var(--accent-vermilion);
  color: var(--accent-vermilion);
  font-weight: 700;
}

.tala-readout {
  font-family: var(--font-mono);
  font-size: 0.7rem !important;
  color: var(--text-primary) !important;
}

/* Section 04: Colophon & Setup */
.colophon-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.15rem;
}

.colophon-panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border-grid);
  border-radius: 6px;
  padding: 1.25rem;
}

.panel-heading {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.45rem;
}

.panel-note {
  font-size: 0.83rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.swatch-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.swatch-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.swatch-box {
  width: 32px;
  height: 32px;
  border-radius: 5px;
  border: 1px solid var(--border-strong);
  flex-shrink: 0;
}

.swatch-bg { background: var(--bg-surface); }
.swatch-elevated { background: var(--bg-elevated); }
.swatch-accent { background: var(--accent-vermilion); }
.swatch-cyan { background: var(--accent-blueprint); }

.swatch-info {
  display: flex;
  flex-direction: column;
  font-size: 0.78rem;
}

.swatch-info strong {
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

.swatch-info span {
  color: var(--text-secondary);
}

.shortcut-table {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.shortcut-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed var(--border-grid);
  font-size: 0.8rem;
}

.shortcut-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.shortcut-row dd {
  color: var(--text-secondary);
  text-align: right;
}

.build-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-size: 0.83rem;
  color: var(--text-secondary);
}

.build-list strong {
  color: var(--text-primary);
}

.build-list code,
.card-specs code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg-surface);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  border: 1px solid var(--border-grid);
}

.build-list a {
  color: var(--accent-blueprint);
  text-decoration: none;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-grid);
  background: var(--bg-elevated);
  padding: 1.25rem 1.5rem;
  position: relative;
  z-index: 1;
}

.footer-inner {
  max-width: 1220px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.monogram-sm {
  font-family: var(--font-mono);
  font-weight: 700;
  padding: 0.15rem 0.4rem;
  border: 1px solid var(--accent-vermilion);
  border-radius: 4px;
  color: var(--text-primary);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.15rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
}

.footer-links a:hover {
  color: var(--accent-vermilion);
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .sheet-section {
    grid-template-columns: 1fr;
  }
  .section-rail {
    flex-direction: row;
    align-items: center;
    border-right: none;
    border-bottom: 1px solid var(--border-grid);
    padding: 0.75rem 1.25rem;
  }
  .rail-label {
    writing-mode: horizontal-tb;
    transform: none;
    margin-top: 0;
  }
  .hero-grid,
  .projects-grid,
  .craft-columns,
  .colophon-grid {
    grid-template-columns: 1fr;
  }
  .metrics-strip {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 720px) {
  .coord-readout {
    display: none;
  }
  .header-inner {
    flex-wrap: wrap;
  }
  .site-nav {
    order: 3;
    width: 100%;
    justify-content: space-between;
  }
  .metrics-strip {
    grid-template-columns: 1fr;
  }
}