/* ═══════════════════════════════════════════════════════════════
   ARDA A. — PORTFOLIO DESIGN SYSTEM
   Theme: Obsidian Slate & Foundry Amber (No AI cliché gradients)
   Typography: Space Grotesk (Display), Plus Jakarta Sans (Body), JetBrains Mono (Code)
   ═══════════════════════════════════════════════════════════════ */

/* ── DESIGN TOKENS ── */
:root {
  /* Dark Theme (Default) */
  --bg-base: #111418;
  --bg-surface: #171c23;
  --bg-surface-elevated: #1f2530;
  --bg-surface-subtle: #14181f;
  --border-subtle: #27303d;
  --border-focus: #3d4a5c;
  --border-active: #e07a5f;

  --accent-copper: #e07a5f;
  --accent-copper-hover: #eb8c73;
  --accent-copper-dim: rgba(224, 122, 95, 0.12);
  --accent-jade: #3da58a;
  --accent-jade-dim: rgba(61, 165, 138, 0.12);
  --accent-blue: #38bdf8;
  --accent-blue-dim: rgba(56, 189, 248, 0.12);

  --text-primary: #f0f4f8;
  --text-secondary: #8897a8;
  --text-muted: #596778;
  --text-inverse: #111418;

  --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  --radius-xs: 3px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  --container-max: 1180px;
  --header-height: 72px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);

  --transition-fast: 160ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 240ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light Theme */
[data-theme="light"] {
  --bg-base: #f6f8fa;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-surface-subtle: #edf1f5;
  --border-subtle: #d3dbe4;
  --border-focus: #9aa7b6;
  --border-active: #c85a3d;

  --accent-copper: #c85a3d;
  --accent-copper-hover: #b34a2e;
  --accent-copper-dim: rgba(200, 90, 61, 0.1);
  --accent-jade: #2b826c;
  --accent-jade-dim: rgba(43, 130, 108, 0.1);
  --accent-blue: #0284c7;
  --accent-blue-dim: rgba(2, 132, 199, 0.1);

  --text-primary: #14181f;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --text-inverse: #ffffff;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

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

button,
input,
textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  border: none;
  background: none;
}

ul {
  list-style: none;
}

:focus-visible {
  outline: 2px solid var(--accent-copper);
  outline-offset: 3px;
}

/* ── LAYOUT UTILITIES ── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.text-copper {
  color: var(--accent-copper);
}

.text-jade {
  color: var(--accent-jade);
}

.text-blue {
  color: var(--accent-blue);
}

.tag-mono {
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* Scroll progress */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--accent-copper);
  z-index: 1000;
  transition: width 80ms ease-out;
}

/* ── ══ HEADER & NAVBAR ══ ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-base);
  border-bottom: 1px solid var(--border-subtle);
  height: var(--header-height);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-symbol {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  color: var(--accent-copper);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.brand-role {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
}

.site-nav .nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
  transition: color var(--transition-fast);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-copper);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ctrl-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  padding: 0 12px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.ctrl-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
  background-color: var(--bg-surface-elevated);
}

.lang-toggle {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  gap: 4px;
}

.lang-opt {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.lang-opt.active {
  color: var(--accent-copper);
}

.lang-divider {
  color: var(--border-subtle);
}

.theme-toggle .icon-sun {
  display: none;
}

[data-theme="light"] .theme-toggle .icon-moon {
  display: none;
}

[data-theme="light"] .theme-toggle .icon-sun {
  display: block;
}

.btn-contact-header {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  padding: 0 16px;
  background-color: var(--accent-copper);
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-contact-header:hover {
  background-color: var(--accent-copper-hover);
  transform: translateY(-1px);
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 8px;
  cursor: pointer;
}

.mobile-menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.mobile-menu-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-toggle.open span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── ══ HERO SECTION ══ ── */
.hero-section {
  padding-top: 72px;
  padding-bottom: 96px;
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.hero-narrative {
  display: flex;
  flex-direction: column;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  background-color: var(--accent-jade-dim);
  border: 1px solid rgba(61, 165, 138, 0.3);
  border-radius: 100px;
  width: fit-content;
  margin-bottom: 24px;
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-jade);
  box-shadow: 0 0 0 3px rgba(61, 165, 138, 0.25);
  animation: pulse-dot 2.4s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% {
    box-shadow: 0 0 0 3px rgba(61, 165, 138, 0.25);
  }
  50% {
    box-shadow: 0 0 0 6px rgba(61, 165, 138, 0.05);
  }
}

.status-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-jade);
}

.hero-heading {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.8vw, 3.1rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.hero-lead {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 36px;
  max-width: 580px;
}

.hero-action-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 48px;
  padding: 0 24px;
  background-color: var(--accent-copper);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-primary:hover {
  background-color: var(--accent-copper-hover);
  transform: translateY(-2px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 24px;
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  border-color: var(--border-focus);
  background-color: var(--bg-surface-elevated);
}

.hero-channels {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.channels-label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.channel-links {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.channel-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.channel-link:hover {
  color: var(--accent-copper);
}

/* ── SIGNATURE ELEMENT: RUNTIME INSPECTOR ── */
.hero-inspector-wrap {
  width: 100%;
}

.runtime-inspector {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.runtime-inspector:hover {
  border-color: var(--border-focus);
}

.inspector-masthead {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background-color: var(--bg-surface-elevated);
  border-bottom: 1px solid var(--border-subtle);
}

.inspector-avatar-frame {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  flex-shrink: 0;
  background-color: var(--bg-base);
}

.inspector-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.inspector-id {
  flex: 1;
  min-width: 0;
}

.inspector-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.inspector-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.meta-dot {
  color: var(--text-muted);
}

.inspector-status-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background-color: var(--accent-jade-dim);
  border: 1px solid rgba(61, 165, 138, 0.25);
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent-jade);
}

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

/* Tabs */
.inspector-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  background-color: var(--bg-surface-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.inspector-tabs.tabs-4 {
  grid-template-columns: repeat(4, 1fr);
}

.tab-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  background: transparent;
  transition: all var(--transition-fast);
}

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

.tab-btn.active {
  color: var(--accent-copper);
  background-color: var(--bg-surface);
  border-bottom-color: var(--accent-copper);
}

/* Screen & Panels */
.inspector-screen {
  padding: 24px;
}

.inspector-panel {
  display: none;
  animation: fadeIn 200ms ease-in-out;
}

.inspector-panel.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.panel-header-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.panel-tag {
  color: var(--accent-copper);
  font-weight: 600;
}

.panel-version {
  color: var(--text-muted);
}

.panel-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 20px;
}

.panel-specs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.spec-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 12px;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.spec-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.spec-value {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Inspector Footer */
.inspector-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background-color: var(--bg-surface-subtle);
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.console-prompt {
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.inspector-gh-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--accent-copper);
  font-weight: 600;
  flex-shrink: 0;
  transition: color var(--transition-fast);
}

.inspector-gh-link:hover {
  color: var(--accent-copper-hover);
}

/* ── ══ COMMON SECTION STYLING ══ ── */
.section-block {
  padding-top: 96px;
  padding-bottom: 96px;
  border-bottom: 1px solid var(--border-subtle);
}

.section-alt {
  background-color: var(--bg-surface-subtle);
}

.section-heading-wrap {
  margin-bottom: 56px;
  max-width: 680px;
}

.section-meta-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-copper);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.section-headline {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.22;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── ══ 01: PILLARS (CORE FOCUS) ══ ── */
.pillars-grid,
.pillars-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.pillar-card {
  display: flex;
  flex-direction: column;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: border-color var(--transition-normal), transform var(--transition-normal), box-shadow var(--transition-normal);
}

.pillar-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.pillar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.pillar-index {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-copper);
}

.pillar-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}

.pillar-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 14px;
}

.pillar-body {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
  flex: 1;
}

.pillar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-top: 18px;
  border-top: 1px solid var(--border-subtle);
}

.pillar-tags span {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--text-secondary);
  background-color: var(--bg-base);
  border: 1px solid var(--border-subtle);
  padding: 3px 8px;
  border-radius: var(--radius-xs);
}

/* ── ══ 02: PROJECTS LIST ══ ── */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 40px;
}

.project-entry {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px 36px;
  gap: 32px;
  transition: border-color var(--transition-normal), transform var(--transition-normal);
}

.project-entry:hover {
  border-color: var(--border-focus);
  transform: translateX(4px);
}

.project-main-col {
  flex: 1;
}

.project-badge-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.project-num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--accent-copper);
  background-color: var(--accent-copper-dim);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
}

.project-category {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.project-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.project-summary {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 18px;
  max-width: 720px;
}

.project-tech-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-tech-pills span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-primary);
  background-color: var(--bg-base);
  border: 1px solid var(--border-subtle);
  padding: 4px 10px;
  border-radius: var(--radius-xs);
}

.project-side-col {
  flex-shrink: 0;
}

.btn-project-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.88rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.btn-project-link:hover {
  background-color: var(--accent-copper);
  border-color: var(--accent-copper);
  color: #ffffff;
}

.projects-all-cta {
  display: flex;
  justify-content: center;
}

.btn-ghost-wide {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.92rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.btn-ghost-wide:hover {
  border-color: var(--accent-copper);
  color: var(--accent-copper);
}

/* ── ══ 03: DEMOS GRID ══ ── */
.demos-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.demo-card {
  display: flex;
  flex-direction: column;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: all var(--transition-normal);
}

.demo-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.demo-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.demo-chip {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-copper);
}

.demo-tech-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  background-color: var(--bg-base);
  border: 1px solid var(--border-subtle);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
}

.demo-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.demo-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 20px;
  flex: 1;
}

.btn-demo-action {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 10px 14px;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.btn-demo-action:hover {
  background-color: var(--accent-copper);
  border-color: var(--accent-copper);
  color: #ffffff;
}

/* ── ══ 04: STACK CATEGORIES ══ ── */
.stack-categories-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.stack-category-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
}

.stack-cat-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.cat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dot-copper {
  background-color: var(--accent-copper);
}

.dot-jade {
  background-color: var(--accent-jade);
}

.dot-blue {
  background-color: var(--accent-blue);
}

.dot-gray {
  background-color: var(--text-muted);
}

.cat-title {
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stack-items-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.stack-item {
  display: flex;
  flex-direction: column;
  font-size: 0.84rem;
}

.stack-code {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-primary);
}

.stack-note {
  font-size: 0.74rem;
  color: var(--text-muted);
}

/* ── ══ 05: CONTACT SECTION ══ ── */
.contact-card-frame {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-md);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 56px;
}

.contact-headline {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 2.8vw, 2.3rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.contact-lead {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 32px;
}

.contact-direct-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.direct-link-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.direct-link-card:hover {
  border-color: var(--accent-copper);
  transform: translateX(3px);
}

.direct-link-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-xs);
  background-color: var(--bg-base);
  color: var(--accent-copper);
}

.direct-link-info {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.direct-link-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.direct-link-val {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.direct-link-arrow {
  font-size: 1rem;
  color: var(--text-muted);
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.direct-link-card:hover .direct-link-arrow {
  color: var(--accent-copper);
  transform: translate(2px, -2px);
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 12px 14px;
  background-color: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.92rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--accent-copper);
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-copper-dim);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.btn-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 28px;
  background-color: var(--accent-copper);
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-submit:hover {
  background-color: var(--accent-copper-hover);
  transform: translateY(-1px);
}

.btn-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.form-status-msg {
  font-size: 0.88rem;
  line-height: 1.5;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  display: none;
}

.form-status-msg.success {
  display: block;
  background-color: var(--accent-jade-dim);
  border: 1px solid rgba(61, 165, 138, 0.4);
  color: var(--accent-jade);
}

.form-status-msg.error {
  display: block;
  background-color: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.4);
  color: #ef4444;
}

/* ── ══ FOOTER ══ ── */
.site-footer {
  padding-top: 36px;
  padding-bottom: 36px;
  background-color: var(--bg-base);
  border-top: 1px solid var(--border-subtle);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.footer-nav a:hover {
  color: var(--accent-copper);
}

.back-to-top {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-copper);
}

/* ── ══ RESPONSIVE BREAKPOINTS ══ ── */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .pillars-grid,
  .pillars-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .demos-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stack-categories-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .inspector-tabs.tabs-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .pillars-grid,
  .pillars-grid-4 {
    grid-template-columns: 1fr;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    padding: 24px;
    display: none;
    box-shadow: var(--shadow-lg);
  }

  .site-nav.open {
    display: block;
  }

  .site-nav .nav-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .btn-contact-header {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .project-entry {
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    gap: 20px;
  }

  .project-side-col {
    width: 100%;
  }

  .btn-project-link {
    width: 100%;
    justify-content: center;
  }

  .demos-grid {
    grid-template-columns: 1fr;
  }

  .stack-categories-grid {
    grid-template-columns: 1fr;
  }

  .form-row-2 {
    grid-template-columns: 1fr;
  }

  .contact-card-frame {
    padding: 28px 20px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}