/**
 * Landing page + guided tutorial styles.
 *
 * Reuses the design tokens defined in modern-styles.css (:root custom
 * properties). Kept in its own file so the welcome/onboarding layer stays
 * separate from the tool's UI.
 */

/* ==========================================================================
   Landing overlay
   ========================================================================== */

.landing-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  overflow: hidden;
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(59, 130, 246, 0.18), transparent 60%),
    radial-gradient(1000px 500px at 100% 0%, rgba(139, 92, 246, 0.16), transparent 55%),
    var(--color-bg);
  color: var(--color-text);
}

/* Hidden once the user has launched the app (set via the head script on
   returning visits, and by LandingPage.hide() after Launch). */
html.landing-seen .landing-overlay {
  display: none;
}

.landing-scroll {
  width: 100%;
  height: 100%;
  overflow-y: auto;
  scrollbar-width: thin;
}

.landing-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: var(--space-lg) var(--space-xl) var(--space-2xl);
}

/* --- Top nav ------------------------------------------------------------- */

.landing-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-sm) 0 var(--space-xl);
}

.landing-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
  font-size: 1.05rem;
}

.landing-brand img {
  border-radius: var(--radius-sm);
}

.landing-nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.landing-nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.landing-nav-links a:hover {
  color: var(--color-text);
}

/* --- Hero ---------------------------------------------------------------- */

.landing-hero {
  text-align: center;
  padding: var(--space-xl) 0 var(--space-2xl);
}

.landing-hero-logo {
  width: 84px;
  height: 84px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg), 0 0 40px rgba(59, 130, 246, 0.25);
  margin-bottom: var(--space-lg);
}

.landing-hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  line-height: 1.05;
  margin: 0 0 var(--space-md);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.landing-hero h1 .grad {
  background: linear-gradient(100deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.landing-tagline {
  font-size: clamp(1.05rem, 2.4vw, 1.4rem);
  color: var(--color-text);
  margin: 0 auto var(--space-sm);
  max-width: 640px;
  font-weight: 500;
}

.landing-sub {
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 620px;
  margin: 0 auto var(--space-xl);
  line-height: 1.6;
}

.landing-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
  margin-bottom: var(--space-lg);
}

.landing-btn-primary,
.landing-btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    background var(--transition-fast), border-color var(--transition-fast);
}

.landing-btn-primary {
  color: #fff;
  background: linear-gradient(100deg, var(--color-primary), var(--color-accent));
  box-shadow: var(--shadow-md), 0 0 24px rgba(59, 130, 246, 0.35);
}

.landing-btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg), 0 0 32px rgba(59, 130, 246, 0.5);
}

.landing-btn-ghost {
  color: var(--color-text);
  background: var(--color-surface);
  border-color: var(--color-border-light);
}

.landing-btn-ghost:hover {
  background: var(--color-surface-elevated);
  border-color: var(--color-primary);
}

.landing-badges {
  color: var(--color-text-dim);
  font-size: 0.85rem;
  letter-spacing: 0.01em;
}

/* --- Section shells ------------------------------------------------------ */

.landing-section {
  margin-top: var(--space-2xl);
}

.landing-section h2 {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 var(--space-xl);
}

/* --- Feature cards ------------------------------------------------------- */

.landing-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-lg);
}

.landing-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.landing-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-light);
}

.landing-card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  background: rgba(59, 130, 246, 0.12);
  color: var(--color-primary);
}

.landing-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 var(--space-sm);
}

.landing-card p {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  line-height: 1.55;
  margin: 0;
}

/* --- How it works -------------------------------------------------------- */

.landing-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
  counter-reset: landing-step;
}

.landing-step {
  position: relative;
  padding: var(--space-lg);
  padding-top: var(--space-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.landing-step::before {
  counter-increment: landing-step;
  content: counter(landing-step);
  position: absolute;
  top: calc(-1 * var(--space-md));
  left: var(--space-lg);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  box-shadow: var(--shadow-sm);
}

.landing-step h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 var(--space-xs);
}

.landing-step p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
  margin: 0;
}

/* --- Sibling-project callout -------------------------------------------- */

.landing-sibling {
  margin-top: var(--space-2xl);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background:
    linear-gradient(120deg, rgba(139, 92, 246, 0.08), rgba(59, 130, 246, 0.06)),
    var(--color-surface);
  text-align: center;
}

.landing-sibling h2 {
  margin-bottom: var(--space-sm);
}

.landing-sibling p {
  color: var(--color-text-muted);
  max-width: 680px;
  margin: 0 auto var(--space-md);
  line-height: 1.6;
}

.landing-sibling a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

.landing-sibling a:hover {
  text-decoration: underline;
}

/* --- Footer -------------------------------------------------------------- */

.landing-footer {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  color: var(--color-text-dim);
  font-size: 0.85rem;
}

.landing-footer a {
  color: var(--color-text-muted);
  text-decoration: none;
}

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

/* ==========================================================================
   Welcome-tour modal (reuses .modal-overlay / .modal from index.html)
   ========================================================================== */

.welcome-modal {
  max-width: 440px;
  text-align: center;
}

.welcome-modal .modal-body {
  padding-top: var(--space-xl);
}

.welcome-modal-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-md);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
}

.welcome-modal h3 {
  margin: 0 0 var(--space-sm);
  font-size: 1.25rem;
}

.welcome-modal p {
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0 auto var(--space-lg);
  max-width: 340px;
}

.welcome-modal-actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
}

.welcome-dontshow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  margin-top: var(--space-lg);
  color: var(--color-text-dim);
  font-size: 0.85rem;
  cursor: pointer;
  user-select: none;
}

/* ==========================================================================
   Guided tutorial (spotlight + tooltip)
   ========================================================================== */

.tour-spotlight {
  position: fixed;
  z-index: 2500;
  border-radius: var(--radius-md);
  box-shadow: 0 0 0 9999px rgba(9, 12, 18, 0.68);
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  pointer-events: none; /* let the user interact with the highlighted element */
  transition: all 180ms ease;
}

.tour-tooltip {
  position: fixed;
  z-index: 2600;
  width: 300px;
  max-width: calc(100vw - 32px);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-lg);
  color: var(--color-text);
}

.tour-tooltip h4 {
  margin: 0 0 var(--space-xs);
  font-size: 1rem;
  font-weight: 600;
}

.tour-tooltip p {
  margin: 0 0 var(--space-md);
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--color-text-muted);
}

.tour-tooltip-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.tour-step-count {
  font-size: 0.8rem;
  color: var(--color-text-dim);
}

.tour-tooltip-buttons {
  display: flex;
  gap: var(--space-xs);
}

.tour-btn {
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.tour-btn-primary {
  color: #fff;
  background: var(--color-primary);
}

.tour-btn-primary:hover {
  background: var(--color-primary-hover);
}

.tour-btn-ghost {
  color: var(--color-text-muted);
  background: transparent;
  border-color: var(--color-border-light);
}

.tour-btn-ghost:hover {
  color: var(--color-text);
  border-color: var(--color-primary);
}

.tour-skip {
  background: none;
  border: none;
  color: var(--color-text-dim);
  font-size: 0.8rem;
  font-family: inherit;
  cursor: pointer;
  padding: 0;
}

.tour-skip:hover {
  color: var(--color-text-muted);
  text-decoration: underline;
}

/* Small-screen tweaks */
@media (max-width: 640px) {
  .landing-nav-links a:not(.landing-nav-launch) {
    display: none;
  }
  .tour-tooltip {
    width: calc(100vw - 32px);
  }
}