/*
 * hero.css — Hero Section Carousel (scoped component)
 *
 * This file holds ONLY the hero carousel styles so it can be loaded on the
 * home page (index.html) alongside the Tailwind build (output.css) WITHOUT
 * pulling in the legacy global stylesheet (styles.css). Loading the full
 * legacy styles.css on a single page caused divergence from the other pages
 * (e.g. a legacy `.container` rule and a different `body` background leaked
 * onto index.html only, shifting the header nav). Keeping the carousel here,
 * self-contained, guarantees index.html renders like every other page except
 * for this scoped component.
 *
 * All selectors are scoped under `.hero-carousel` (no global side effects).
 */

/* Design tokens consumed by the carousel (self-contained copy so this file
   does not depend on the legacy styles.css). */
:root {
  --c-sky: #3aaedc;
  --c-deep: #1a2b5c;
  --c-hover: #2490ba;
  --c-white: #ffffff;

  --radius-sm: 12px;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;

  --z-base: 1;

  --container: 1120px;

  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --font-heading: "Barlow", var(--font-body);
}

/* Minimal reset so the carousel renders correctly in the standalone hero.html
   (which does not load the Tailwind Preflight). On index.html these are already
   provided by output.css and simply re-assert the same values. */
.hero-carousel *,
.hero-carousel *::before,
.hero-carousel *::after {
  box-sizing: border-box;
}

/* Visually-hidden helper for the aria-live region (standalone hero.html).
   index.html also gets `.sr-only` from Tailwind; this is a harmless duplicate. */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ====== Hero Carousel ====== */
/*
 * Self-contained, single contiguous block (Req 11.4, 15.3).
 * All selectors are scoped under `.hero-carousel` to avoid any side effects.
 * Mobile-first: base rules target < 768px, media queries layer tablet/desktop.
 */

/* Container: full-viewport, layered stacking context, overflow clipped.
   Base color doubles as fallback background if slide images fail (Req 13.5). */
.hero-carousel {
  position: relative;
  min-height: 100dvh; /* mobile default (Req 8.2) */
  overflow: hidden;
  isolation: isolate;
  background-color: var(--c-deep);
}

/* Slides layer: absolute-fill images, GPU-accelerated opacity fade (Req 13.3) */
.hero-carousel .hero-slides {
  position: absolute;
  inset: 0;
  z-index: var(--z-base);
}

.hero-carousel .hero-slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover; /* cover without distortion (Req 10.2) */
  object-position: center; /* keep architectural subject visible (Req 10.3) */
  opacity: 0;
  will-change: opacity; /* GPU hint (Req 13.3) */
  transform: translateZ(0); /* force GPU layer (Req 13.3) */
  transition: opacity 800ms cubic-bezier(0.4, 0, 0.2, 1);
}

.hero-carousel .hero-slide.is-active {
  opacity: 1;
}

/* Overlay: left-to-right brand gradient, no pure black (Req 7.1).
   Left 50% alpha >= 0.75 (deep), tapering to <= 0.3 (sky) at the right edge
   (Req 7.2, 7.3). color-mix produces translucent brand colors; smooth stops
   avoid banding (Req 7.5). */
.hero-carousel .hero-overlay {
  position: absolute;
  inset: 0;
  z-index: calc(var(--z-base) + 1);
  pointer-events: none;
  background: linear-gradient(
    90deg,
    color-mix(in srgb, var(--c-deep) 90%, transparent) 0%,
    color-mix(in srgb, var(--c-deep) 82%, transparent) 50%,
    color-mix(in srgb, var(--c-sky) 42%, transparent) 80%,
    color-mix(in srgb, var(--c-sky) 22%, transparent) 100%
  );
}

/* Body: relative layer above overlay, holds text + controls (Req 5.3).
   Vertically centered content; top padding clears the overlaying header
   (Req 8.5). box-sizing:border-box (global reset) keeps padding inside. */
.hero-carousel .hero-body {
  position: relative;
  z-index: calc(var(--z-base) + 2);
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100dvh;
  width: 100%;
  padding-block: calc(var(--space-6) + var(--space-3)) var(--space-5); /* ~88px top clears 64px header */
  padding-inline: var(--space-2); /* 16px each side -> full width minus 32px (Req 5.4, 14.3) */
}

/* Text content: left-aligned, responsive max-width (Req 14.1, 14.2, 14.3) */
.hero-carousel .hero-content {
  max-width: 100%;
  text-align: left;
}

/* Heading: Barlow 700, clamp 32->48px, white (Req 5.1, 5.5, 5.6, 14.4) */
.hero-carousel .hero-heading {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-white);
}

/* Subtitle: Inter 400, clamp 16->20px, white at 90% opacity (Req 5.2, 5.6, 14.5) */
.hero-carousel .hero-subtitle {
  margin: 0 0 var(--space-4);
  max-width: 54ch;
  font-family: var(--font-body);
  font-weight: 400;
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.6;
  color: var(--c-white);
  opacity: 0.9;
}

/* Actions: stacked on mobile, becomes a row at >= 768px (Req 6.8) */
.hero-carousel .hero-actions {
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: var(--space-2);
}

/* CTA buttons: self-contained (do not depend on global `.btn`).
   Both meet the 44x44 minimum touch target (Req 6.5). */
.hero-carousel .hero-btn-primary,
.hero-carousel .hero-btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 16px;
  line-height: 1.2;
  cursor: pointer;
  transition: background-color 200ms ease, border-color 200ms ease, color 200ms ease;
}

/* Primary CTA: --c-sky fill, white text, --c-hover on hover/focus (Req 6.3, 6.6) */
.hero-carousel .hero-btn-primary {
  border: 2px solid var(--c-sky);
  background-color: var(--c-sky);
  color: var(--c-white);
}
.hero-carousel .hero-btn-primary:hover,
.hero-carousel .hero-btn-primary:focus-visible {
  background-color: var(--c-hover);
  border-color: var(--c-hover);
}

/* Secondary CTA: ghost with white/30% border, white/10% fill on hover (Req 6.4, 6.7) */
.hero-carousel .hero-btn-secondary {
  border: 2px solid color-mix(in srgb, var(--c-white) 30%, transparent);
  background-color: transparent;
  color: var(--c-white);
}
.hero-carousel .hero-btn-secondary:hover,
.hero-carousel .hero-btn-secondary:focus-visible {
  background-color: color-mix(in srgb, var(--c-white) 10%, transparent);
}

/* Control architecture — independent alignment references (premium layout):
   - Slides: full-bleed image layer (viewport reference).
   - Content (heading/subtitle/CTAs/dots): constrained, left-aligned column.
   - Arrows: anchored to the hero section (viewport edges), NOT the content
     column, so they hug the lateral extremes for a sense of amplitude.
   The arrows are direct children of `.hero-carousel` in the markup, so their
   containing block is the full-viewport section rather than the narrower,
   centered `.hero-body`. */

/* Arrows: absolute against the hero section, vertically centered on the full
   viewport height, opacity 0.7 -> 1.0 in 200ms (Req 2.1, 2.5). Hidden by
   default on mobile, revealed at >= 768px (Req 2.2). */
.hero-carousel .hero-arrow {
  display: none;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: calc(var(--z-base) + 3);
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  border: 1px solid color-mix(in srgb, var(--c-white) 30%, transparent);
  border-radius: 50%;
  background-color: color-mix(in srgb, var(--c-deep) 45%, transparent);
  color: var(--c-white);
  opacity: 0.7;
  cursor: pointer;
  transition: opacity 200ms ease, background-color 200ms ease;
}
.hero-carousel .hero-arrow:hover,
.hero-carousel .hero-arrow:focus-visible {
  opacity: 1;
  background-color: color-mix(in srgb, var(--c-deep) 65%, transparent);
}
/* Lateral offset uses clamp() so the arrows stay near the screen edges with
   responsive breathing room: ~16px on small screens up to ~64px on large ones,
   independent of the content column width. (Req 2.1) */
.hero-carousel .hero-arrow-prev {
  left: clamp(var(--space-2), 3.5vw, var(--space-6));
}
.hero-carousel .hero-arrow-next {
  right: clamp(var(--space-2), 3.5vw, var(--space-6));
}
.hero-carousel .hero-arrow svg {
  width: 24px;
  height: 24px;
}

/* Dots: in the content flow just below the CTAs, aligned to the text column
   (an independent reference from the viewport-anchored arrows). The negative
   inline-start margin cancels the dot's internal padding so the first marker
   lines up flush with the heading/subtitle text, and margin-top pulls the row
   close to the CTAs to reinforce the visual hierarchy. (Req 3.2) */
.hero-carousel .hero-dots {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-3);
  margin-left: calc(-1 * var(--space-2));
}

/* Each dot is a 44x44 touch target; the visible pill is drawn via ::before
   so the interactive area stays large while the marker stays small (Req 3.2). */
.hero-carousel .hero-dot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}
.hero-carousel .hero-dot::before {
  content: "";
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background-color: var(--c-white);
  opacity: 0.55;
  transition: width 300ms ease, opacity 300ms ease; /* 200-400ms range (Req 3.3) */
}
/* Active dot: pill shape (extended width) + full opacity (Req 3.3) */
.hero-carousel .hero-dot.is-active::before {
  width: 32px;
  opacity: 1;
}

/* Reduced motion: disable all hero transitions/animations (Req 12.6 companion,
   accessibility Req 6.6). Slides still swap to their .is-active end-state
   instantly (JS toggles the class) — only the perceived fade/transform motion
   is removed. Covers every scoped element plus a catch-all so nothing inside
   the carousel animates. */
@media (prefers-reduced-motion: reduce) {
  .hero-carousel *,
  .hero-carousel *::before,
  .hero-carousel *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .hero-carousel .hero-slide,
  .hero-carousel .hero-dot::before,
  .hero-carousel .hero-arrow,
  .hero-carousel .hero-btn-primary,
  .hero-carousel .hero-btn-secondary {
    transition: none !important;
  }
}

/* Tablet and up (>= 768px): 100vh height, arrows visible, row CTAs,
   content max-width 500px, wider gutters (Req 8.1, 2.1, 6.8, 14.2) */
@media (min-width: 768px) {
  .hero-carousel {
    min-height: 100vh;
  }
  .hero-carousel .hero-body {
    min-height: 100vh;
    width: min(var(--container), 100%);
    margin-inline: auto;
    padding-inline: var(--space-4); /* 32px */
  }
  .hero-carousel .hero-content {
    max-width: 500px;
  }
  .hero-carousel .hero-actions {
    flex-direction: row;
    align-items: center;
  }
  .hero-carousel .hero-arrow {
    display: inline-flex;
  }
}

/* Desktop and up (>= 1024px): content max-width 600px, 64px left padding,
   larger header clearance for the 80px header (Req 14.1, 5.4, 8.5) */
@media (min-width: 1024px) {
  .hero-carousel .hero-body {
    padding-inline: var(--space-6); /* 64px (Req 5.4) */
    padding-top: calc(var(--space-6) + var(--space-4)); /* ~96px clears 80px header */
  }
  .hero-carousel .hero-content {
    max-width: 600px;
  }
}