/* ==========================================================================
   RunRush Landing Page – 3-Slide Mobile-First Intro
   CSS Scroll-Snap, Fixed Overlays, Zero Layout Shift
   Consumes design tokens exclusively from tokens.css.
   Strictly zero hardcoded hex or rgba values.
   ========================================================================== */

:root,
html.landing-html,
body.landing-body {
  --bg-body: #07090C;
  --bg-surface: #0F1218;
  --bg-surface-raised: rgba(20, 24, 32, 0.75);
  --bg-overlay: rgba(7, 9, 12, 0.75);
  --scrim-gradient: linear-gradient(to bottom, rgba(7, 9, 12, 0.88) 0%, rgba(7, 9, 12, 0.45) 55%, transparent 100%);
  --border-color: rgba(255, 255, 255, 0.12);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.22);
  --text-primary: #F3F4F6;
  --text-secondary: #9BA3AF;
  --text-tertiary: #6B7280;
  --text-on-accent: #07090C;
  --accent: #4ADE80;
  --accent-strong: #22C55E;
  --accent-lime-soft: rgba(74, 222, 128, 0.15);
  --shadow-cta-glow: 0 4px 22px rgba(74, 222, 128, 0.38);
  --shadow-cta-hover: 0 6px 28px rgba(74, 222, 128, 0.52);
  color-scheme: dark;
}

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

html.landing-html {
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-body);
}

body.landing-body {
  font-family: var(--font-family-base, 'Inter', -apple-system, BlinkMacSystemFont, sans-serif);
  background-color: var(--bg-body);
  color: var(--text-primary);
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Fixed Top Header & Scrim (Contrast Protection over Bright Sky) ── */
.landing-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  pointer-events: none;
}

.header-scrim {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 130px;
  background: var(--scrim-gradient);
  pointer-events: none;
  z-index: -1;
}

.hero-brand-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--text-primary);
  pointer-events: auto;
}

.hero-brand-badge:focus-visible {
  outline: 2px solid var(--accent);
  border-radius: var(--radius-sm);
  outline-offset: 3px;
}

.brand-icon-wrap {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--accent-lime-soft);
  border: 1px solid var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}

.brand-title-text {
  font-size: var(--fs-h3);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-tight);
  color: var(--text-primary);
}

.landing-skip-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 var(--space-3);
  color: var(--text-primary);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-semibold);
  text-decoration: none;
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: color 0.2s var(--ease-standard), opacity 0.2s var(--ease-standard);
  pointer-events: auto;
  -webkit-tap-highlight-color: transparent;
}

.landing-skip-btn:hover {
  color: var(--accent);
}

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

/* ── Native CSS Scroll-Snap Viewport ── */
.slides-viewport {
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  position: relative;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.slides-viewport::-webkit-scrollbar {
  display: none;
}

.slides-track {
  display: flex;
  height: 100%;
  width: max-content;
}

/* ── Individual Slide ── */
.slide {
  flex: 0 0 100vw;
  min-width: 100vw;
  width: 100vw;
  height: 100%;
  height: 100dvh;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  position: relative;
  overflow: hidden;
  background-color: var(--bg-body);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  box-sizing: border-box;
}

/* Slide background photo (with subtle horizontal parallax) */
.slide-photo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 25%;
  display: block;
  z-index: 1;
  background-color: var(--bg-body);
  pointer-events: none;
  user-select: none;
  -webkit-user-drag: none;
  will-change: transform;
}

/* Preloaded photos start hidden to prevent pop-in */
.slide-photo--preload {
  opacity: 0;
  transition: opacity 250ms var(--ease-out);
}

.slide-photo--preload.is-ready {
  opacity: 1;
}

/* CSS-only dark gradient overlay fading down to page background token */
.slide-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    transparent 25%,
    var(--bg-overlay) 58%,
    var(--bg-body) 84%,
    var(--bg-body) 100%
  );
  pointer-events: none;
}

/* Content block in slide (ONLY text moves with slide) */
.slide-content {
  position: relative;
  z-index: 10;
  width: 100%;
  padding: 0 var(--space-6) calc(190px + env(safe-area-inset-bottom, 24px));
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin: 0 auto;
  box-sizing: border-box;
}

/* Motion polish on text block: short fade + 12px upward translate */
.slide-text-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  width: 100%;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 320ms var(--ease-out), transform 320ms var(--ease-out);
  will-change: opacity, transform;
}

.slide.is-active .slide-text-block {
  opacity: 1;
  transform: translateY(0);
}

/* Tag Pill */
.slide-tag-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px var(--space-3);
  border-radius: var(--radius-full);
  background: var(--bg-surface-raised);
  border: 1px solid var(--border-color);
  color: var(--accent);
  font-size: var(--fs-caption);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  margin-bottom: var(--space-4);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  user-select: none;
}

.slide-tag-pill svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* Huge uppercase headline (clamp 44px - 64px, Inter 800, tight line-height) */
.slide-headline {
  font-size: clamp(2.75rem, 8vw, 4rem);
  font-weight: var(--fw-bold);
  line-height: 0.98;
  letter-spacing: var(--ls-tight);
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  max-width: 480px;
}

/* Muted sentence copy */
.slide-copy {
  font-size: var(--fs-body);
  line-height: var(--lh-relaxed);
  color: var(--text-secondary);
  max-width: 380px;
  margin: 0 auto;
}

/* ── Fixed Bottom Controls Layer (Pixel-Identical Across All Slides) ── */
.fixed-bottom-controls {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 30;
  pointer-events: none;
}

.controls-inner {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 var(--space-6) max(var(--space-6), env(safe-area-inset-bottom, 20px));
  box-sizing: border-box;
}

/* Pagination Dots */
.pagination-dots {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
  user-select: none;
  pointer-events: auto;
}

.dot-btn {
  position: relative;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--border-strong);
  border: none;
  padding: 0;
  cursor: pointer;
  transition: width 0.3s var(--ease-out), background-color 0.3s var(--ease-standard);
  -webkit-tap-highlight-color: transparent;
}

.dot-btn::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 36px;
  height: 36px;
}

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

.dot-btn[aria-current="step"],
.dot-btn.active {
  width: 28px;
  background: var(--accent);
}

/* Primary CTA Button Wrapper */
.cta-wrapper {
  width: 100%;
  max-width: 420px;
  height: 52px;
  pointer-events: auto;
}

/* Primary CTA Button (Glow on CTA only) */
.slide-cta-btn {
  position: relative;
  width: 100%;
  height: 52px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 100%);
  color: var(--text-on-accent);
  font-size: var(--fs-body);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-wide);
  border: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  cursor: pointer;
  box-shadow: var(--shadow-cta-glow);
  transition: transform 0.2s var(--ease-standard), box-shadow 0.2s var(--ease-standard), filter 0.2s var(--ease-standard);
  -webkit-tap-highlight-color: transparent;
  overflow: hidden;
}

.slide-cta-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-cta-hover);
  filter: brightness(1.05);
}

.slide-cta-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-cta-glow);
}

.slide-cta-btn:focus-visible {
  outline: 2px solid var(--accent-strong);
  outline-offset: 3px;
}

/* Label cross-fade within button (150ms opacity transition) */
.cta-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 150ms var(--ease-out);
  will-change: opacity;
}

.cta-label.is-active {
  opacity: 1;
  pointer-events: auto;
}

/* Reserved space for "Sign in" row (Fixed height on ALL slides -> 0 layout jump) */
.secondary-action-row {
  height: 38px;
  min-height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: var(--space-2);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 150ms var(--ease-out), visibility 150ms var(--ease-out);
}

.secondary-action-row.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.slide-secondary-link {
  color: var(--text-secondary);
  font-size: var(--fs-body-sm);
  text-decoration: none;
  transition: color 0.2s var(--ease-standard);
  padding: var(--space-1) var(--space-2);
}

.slide-secondary-link:hover {
  color: var(--text-primary);
}

.slide-secondary-link .accent-link {
  color: var(--accent);
  font-weight: var(--fw-semibold);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.slide-secondary-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ── Desktop Breakpoint (768px and up) ── */
@media (min-width: 768px) {
  .landing-header {
    padding: var(--space-6) var(--space-8);
  }

  .slide-content {
    max-width: 480px;
    padding-bottom: 220px;
  }

  .controls-inner {
    max-width: 480px;
    padding-bottom: var(--space-8);
  }

  .slide-headline {
    font-size: clamp(3rem, 5vw, 4rem);
  }
}

/* ── Accessibility: Prefers Reduced Motion ── */
@media (prefers-reduced-motion: reduce) {
  .slides-viewport {
    scroll-behavior: auto !important;
  }

  .slide-photo {
    transform: none !important;
    will-change: auto !important;
  }

  .slide-text-block {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
    will-change: auto !important;
  }

  .cta-label {
    transition: none !important;
  }

  .secondary-action-row {
    transition: none !important;
  }

  .dot-btn {
    transition: none !important;
  }

  .slide-cta-btn {
    transition: none !important;
    animation: none !important;
  }
}