/* =============================================================
   ChatUCY Design System — inspired by KK Portfolio
   ============================================================= */

/* ─── Google Fonts ─── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Space+Grotesk:wght@500;600;700&display=swap');

/* ─── CSS Variables ─── */
:root {
  --bg: #f1eef9;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-elevated: rgba(255, 255, 255, 0.92);
  --text: #1a1a1a;
  --text-strong: #070707;
  --muted: #5a5a5a;
  --border: rgba(106, 66, 194, 0.12);
  --accent: #6a42c2;
  --bg-overlay: radial-gradient(ellipse 120% 55% at 50% -5%, rgba(106, 66, 194, 0.13) 0%, rgba(241, 238, 249, 0.0) 65%);
  --radius: 2px;
  --shadow: none;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --font-heading: "Space Grotesk", "Inter", sans-serif;
  --font-body: "Inter", "Helvetica Neue", sans-serif;
}

html[data-theme="dark"] {
  --bg: #09060f;
  --surface: rgba(18, 12, 30, 0.88);
  --surface-elevated: rgba(24, 16, 40, 0.94);
  --text: #d6d6d6;
  --text-strong: #f5f5f5;
  --muted: #9a9a9a;
  --border: rgba(139, 109, 212, 0.18);
  --accent: #8b6dd4;
  --bg-overlay: radial-gradient(ellipse 120% 55% at 50% -5%, rgba(106, 66, 194, 0.22) 0%, rgba(9, 6, 15, 0.0) 65%);
}

/* ─── Base Reset ─── */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

/* ─── Typography ─── */
body {
  font-family: var(--font-body) !important;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  z-index: -1;
  pointer-events: none;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading) !important;
  color: var(--text-strong);
  margin: 0;
  letter-spacing: -0.02em;
}

p { margin: 0; }

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

.ds-link {
  position: relative;
  color: var(--text-strong);
}
.ds-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  height: 1px;
  width: 0;
  background: var(--accent);
  transition: width 0.18s ease;
}
.ds-link:hover::after,
.ds-link:focus-visible::after {
  width: 100%;
}
.ds-link--accent { color: var(--accent); }

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

/* ─── Layout ─── */
.ds-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  text-align: center;
}

/* ─── Site Header ─── */
.ds-site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface-elevated);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.ds-site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
  text-align: left;
}

.ds-site-logo {
  font-family: var(--font-heading);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--text-strong);
  text-decoration: none;
}

.ds-site-nav {
  display: flex;
  gap: var(--space-5);
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

.ds-site-nav a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s ease;
}
.ds-site-nav a:hover,
.ds-site-nav a:focus-visible {
  color: var(--text-strong);
}
.ds-site-nav a.active {
  color: var(--accent);
}

/* ─── Theme Toggle ─── */
.ds-theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.6rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--muted);
}
.ds-theme-toggle-label {
  color: var(--text-strong);
}
.ds-theme-toggle-buttons {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.ds-theme-toggle button {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 6px 10px;
  font-size: 0.6rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  cursor: pointer;
  font-family: var(--font-body);
}
.ds-theme-toggle button.is-active {
  color: var(--text-strong);
  background: color-mix(in srgb, var(--surface-elevated) 80%, transparent);
}

/* ─── Buttons ─── */
.ds-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-strong);
  background: transparent;
  cursor: pointer;
  font-family: var(--font-body);
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
  text-decoration: none;
}
.ds-btn:hover,
.ds-btn:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}
.ds-btn--solid {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}
.ds-btn--solid:hover,
.ds-btn--solid:focus-visible {
  background: color-mix(in srgb, var(--accent) 82%, #000);
  border-color: color-mix(in srgb, var(--accent) 82%, #000);
  color: #fff;
}

/* ─── Panels ─── */
.ds-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-6);
  text-align: left;
  transition: border-color 0.22s ease, box-shadow 0.22s ease;
}
.ds-panel--tight {
  padding: var(--space-4);
}
.ds-panel--elevated {
  background: var(--surface-elevated);
}
.ds-panel--elevated:hover {
  border-color: rgba(106, 66, 194, 0.35);
  box-shadow: 0 8px 36px rgba(106, 66, 194, 0.10);
}

/* ─── Chips ─── */
.ds-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.ds-chip--accent {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
}

/* ─── Section ─── */
.ds-section {
  padding: var(--space-8) 0;
  border-top: 1px solid rgba(106, 66, 194, 0.08);
}

.ds-section-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.ds-section-number {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.28;
  letter-spacing: 0.05em;
  line-height: 1;
}

.ds-section-title {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.32em;
  color: var(--muted);
}
.ds-section-title::after {
  display: none;
}

/* ─── Meta text ─── */
.ds-meta {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ─── Footer ─── */
.ds-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-5) 0;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.ds-footer a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s ease;
}
.ds-footer a:hover { color: var(--accent); }

/* ─── Tag lists ─── */
.ds-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ─── Canvas frame ─── */
.ds-canvas-frame {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}

/* ─── Mobile nav ─── */
.ds-mobile-nav {
  display: none;
}
.ds-mobile-nav summary {
  cursor: pointer;
  list-style: none;
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-strong);
  font-family: var(--font-body);
}
.ds-mobile-nav[open] summary {
  color: var(--accent);
}
.ds-mobile-nav nav {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-3);
  padding: var(--space-4);
  background: var(--surface-elevated);
  border: 1px solid var(--border);
}
.ds-mobile-nav nav a {
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}
.ds-mobile-nav nav a:hover { color: var(--accent); }

/* ─── App header (used in chat/llmms pages) ─── */
.ds-app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--surface-elevated);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.ds-app-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  gap: var(--space-3);
}

.ds-app-header-title {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-strong);
  flex: 1;
}

.ds-app-logo {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--text-strong);
  text-decoration: none;
}

.ds-app-nav {
  display: flex;
  gap: var(--space-4);
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.ds-app-nav a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s ease;
}
.ds-app-nav a:hover { color: var(--accent); }

/* ─── Icon button ─── */
.ds-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease;
  font-size: 0.85rem;
}
.ds-icon-btn:hover,
.ds-icon-btn:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

/* ─── Dropdown menu ─── */
.ds-dropdown-menu {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-2) 0;
  min-width: 180px;
}
.ds-dropdown-menu a,
.ds-dropdown-menu button {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: 0.75rem;
  color: var(--muted);
  text-decoration: none;
  background: transparent;
  border: 0;
  width: 100%;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-body);
  transition: color 0.18s ease, background 0.18s ease;
}
.ds-dropdown-menu a:hover,
.ds-dropdown-menu button:hover {
  color: var(--text-strong);
  background: color-mix(in srgb, var(--surface) 80%, transparent);
}
.ds-dropdown-menu-divider {
  height: 1px;
  background: var(--border);
  margin: var(--space-2) 0;
}
.ds-dropdown-version {
  padding: var(--space-2) var(--space-4);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

/* ─── Hero badge ─── */
.ds-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border: 1px solid rgba(106, 66, 194, 0.3);
  border-radius: 99px;
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(106, 66, 194, 0.07);
}

/* ─── Feature icon box ─── */
.ds-feat-icon {
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(106, 66, 194, 0.09);
  border: 1px solid rgba(106, 66, 194, 0.2);
  border-radius: var(--radius);
  color: var(--accent);
  font-size: 1.1rem;
  margin-bottom: var(--space-4);
}

/* ─── Hero (for landing page) ─── */
.ds-hero {
  padding: calc(var(--space-8) + 40px) 0 calc(var(--space-8) + 16px);
  position: relative;
  overflow: hidden;
}
.ds-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 70% at 50% 45%, rgba(106, 66, 194, 0.12) 0%, transparent 68%);
  pointer-events: none;
  z-index: 0;
}

.ds-hero-inner {
  display: grid;
  gap: var(--space-5);
  justify-items: center;
  text-align: center;
  position: relative;
  z-index: 1;
}

.ds-hero-title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.05;
  font-weight: 700;
  font-family: var(--font-heading);
  color: var(--accent);
  letter-spacing: -0.02em;
  margin: 0;
}

.ds-hero-subline {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 52ch;
}

.ds-status-line {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  justify-content: center;
}
.ds-status-line span {
  border: 1px solid rgba(106, 66, 194, 0.28);
  background: rgba(106, 66, 194, 0.07);
  color: var(--accent);
  padding: 6px 14px;
  border-radius: 99px;
}

.ds-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: center;
}

/* ─── List rows (teams, experience etc.) ─── */
.ds-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.ds-list-row {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
  text-align: left;
}
.ds-list-row:first-child {
  border-top: none;
  padding-top: 0;
}

/* ─── Grid ─── */
.ds-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}
.ds-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
.ds-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
}

/* ─── Contact info ─── */
.ds-contact-item {
  display: grid;
  gap: var(--space-2);
}

/* ─── Industry callout ─── */
.ds-callout {
  font-size: 0.8rem;
  color: var(--muted);
  border-left: 2px solid var(--accent);
  padding-left: var(--space-3);
  margin-top: var(--space-3);
}

/* ─── Chat integration overrides ─── */
/* These override Tailwind primary purple with the design system accent */
.ds-accent-bg { background-color: var(--accent) !important; }
.ds-accent-text { color: var(--accent) !important; }
.ds-accent-border { border-color: var(--accent) !important; }

/* ─── Sidebar (app pages) ─── */
.ds-sidebar {
  background: var(--surface) !important;
  border-right: 1px solid var(--border) !important;
}

.ds-sidebar-header {
  border-bottom: 1px solid var(--border) !important;
}

/* ─── Scrollbar ─── */
.ds-scrollbar::-webkit-scrollbar { width: 4px; }
.ds-scrollbar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}
.ds-scrollbar::-webkit-scrollbar-thumb:hover {
  background: var(--muted);
}

/* ─── Responsive ─── */
@media (max-width: 960px) {
  .ds-container {
    padding: 0 var(--space-4);
  }
  .ds-site-nav,
  .ds-app-nav {
    display: none;
  }
  .ds-mobile-nav {
    display: block;
  }
  .ds-grid-2,
  .ds-grid-3,
  .ds-grid-4 {
    grid-template-columns: 1fr;
  }
  .ds-list-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .ds-hero { padding-top: var(--space-7); }
  .ds-section-header { grid-template-columns: 1fr; }
  .ds-section-title::after { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}