/* ==========================================================================
   UAVs Meet Embodied Intelligence - Level 1 Category Landing Styles
   Rectangular Vertical Strips (Strict 90° Angles, Zero Border-Radius),
   Hover Image Brightening & Activation, Clean Category Title Only.
   ========================================================================== */

/* Level 1 Landing Container */
.category-landing-view {
  position: relative;
  z-index: 10;
  width: 100%;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 2rem 2.5rem;
  box-sizing: border-box;
  opacity: 1;
  transition: opacity 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.category-landing-view.is-hidden {
  display: none;
  opacity: 0;
  pointer-events: none;
}

/* Landing Top Bar */
.landing-top-bar {
  display: flex;
  justify-content: flex-end;
  min-height: 1.725rem;
  align-items: center;
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
}

.landing-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--color-navy, #102639);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.landing-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.landing-links a {
  text-decoration: none;
  color: var(--color-muted, #586976);
  font-family: var(--font-mono, monospace);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color 0.2s ease;
}

.landing-links a:hover {
  color: var(--color-orange, #df6f3f);
}

/* Landing Center Content Area */
.landing-center-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 1440px;
  margin: auto;
  padding: 1rem 0;
}

.landing-hero-heading {
  width: 100%;
  max-width: 1180px;
  margin-top: -1.35rem;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 1.6rem;
  text-align: center;
}

.landing-pill {
  display: inline-block;
  font-family: var(--font-mono, monospace);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-orange, #df6f3f);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.landing-title {
  max-width: 1120px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 0;
  color: var(--color-navy, #102639);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.landing-title-main {
  display: block;
  font-size: clamp(2.1rem, 3.8vw, 3.15rem);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: inherit;
}

.landing-title-extension {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 0.35rem;
  font-size: clamp(1.22rem, 2.25vw, 1.9rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: inherit;
}

.landing-title-extension > span {
  display: block;
}

/* 5 Vertical Category Image Strips (Enhanced Scale + Stagger Entrance) */
.category-windows-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(16px, 1.4vw, 24px);
  margin: 1.5rem auto;
  perspective: 1000px;
}

/* Sharp Rectangular Strip (Zero Border-Radius, Strict 90° Angles, Enhanced 10-18% Presence) */
.category-panel,
.category-strip {
  position: relative;
  width: clamp(140px, 9.6vw, 168px);
  height: clamp(410px, 28vw, 470px);
  border-radius: 0px !important; /* STRICTLY NO ROUNDED CORNERS */
  overflow: hidden;
  cursor: pointer;
  background: #ffffff;
  border: 1px solid rgba(16, 38, 57, 0.16);
  box-shadow: 0 10px 30px rgba(16, 38, 57, 0.08);
  opacity: 1;
  transform: translateY(0);
  transition: border-color 0.32s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.32s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.4s cubic-bezier(0.22, 1, 0.36, 1),
              opacity 0.45s ease;
  user-select: none;
  will-change: transform, opacity;
}

/* 5-Card Stagger Entrance (Section XXVIII) */
.category-windows-group.stagger-init .category-panel {
  opacity: 0;
  transform: translateY(24px);
}

.category-windows-group.stagger-in .category-panel {
  opacity: 1;
  transform: translateY(0);
}

.category-windows-group.stagger-in .category-panel:nth-child(1) { transition-delay: 0ms; }
.category-windows-group.stagger-in .category-panel:nth-child(2) { transition-delay: 70ms; }
.category-windows-group.stagger-in .category-panel:nth-child(3) { transition-delay: 140ms; }
.category-windows-group.stagger-in .category-panel:nth-child(4) { transition-delay: 210ms; }
.category-windows-group.stagger-in .category-panel:nth-child(5) { transition-delay: 280ms; }

/* Enhanced Hover: Lift, Brighten, and Subtle Scale (Section XXIX) */
.category-panel:hover,
.category-panel.is-active {
  border-color: rgba(223, 111, 63, 0.72);
  box-shadow: 0 22px 50px rgba(8, 26, 44, 0.28);
  transform: translateY(-6px);
  z-index: 5;
}

/* Full-color paper image with hover brightening & mouse parallax */
.category-panel-media {
  position: absolute;
  inset: -14px;
  width: calc(100% + 28px);
  height: calc(100% + 28px);
  object-fit: cover;
  border-radius: 0px !important;
  filter: brightness(0.74) contrast(0.94) saturate(0.96); /* Dimmed default */
  opacity: 0.88;
  transition: filter 0.32s cubic-bezier(0.22, 1, 0.36, 1),
              opacity 0.32s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.16s ease-out;
  pointer-events: none;
}

/* Hovered strip image is awakened & brightened */
.category-panel:hover .category-panel-media,
.category-panel.is-active .category-panel-media {
  filter: brightness(1.0) contrast(1.04) saturate(1.08); /* Fully bright & clear */
  opacity: 1.0;
}

/* Non-hovered strips become subtly dimmer */
.category-windows-group.is-hovered .category-panel:not(:hover) .category-panel-media {
  filter: brightness(0.62) contrast(0.92) saturate(0.92);
  opacity: 0.72;
}

/* Gradient overlay for title legibility */
.category-panel-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(16, 38, 57, 0.02) 0%, rgba(16, 38, 57, 0.22) 50%, rgba(16, 38, 57, 0.88) 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.25rem 0.85rem;
  box-sizing: border-box;
  pointer-events: none;
  border-radius: 0px !important;
  transition: background 0.32s ease;
}

.category-panel:hover .category-panel-overlay,
.category-panel.is-active .category-panel-overlay {
  background: linear-gradient(180deg, rgba(16, 38, 57, 0.0) 0%, rgba(16, 38, 57, 0.14) 40%, rgba(16, 38, 57, 0.92) 100%);
}

/* Clean Category Name Only */
.category-strip-title {
  font-size: 0.92rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: #ffffff;
  line-height: 1.28;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
  text-align: left;
  transition: color 0.25s ease;
}

.category-panel:hover .category-strip-title,
.category-panel.is-active .category-strip-title {
  color: #ffffff;
}

/* Landing Footer Hint */
.landing-footer {
  text-align: center;
  font-family: var(--font-mono, monospace);
  font-size: 0.78rem;
  color: var(--color-muted, #586976);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* FLIP Transition Morph Overlay */
.category-morph-overlay {
  position: fixed;
  z-index: 100;
  pointer-events: none;
  border-radius: 0px !important;
  overflow: hidden;
  background: #ffffff;
  box-shadow: 0 24px 80px rgba(16, 38, 57, 0.25);
  transition: all 0.55s cubic-bezier(0.22, 1, 0.36, 1);
  display: none;
}

.category-morph-overlay img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0px !important;
}

/* Responsive: Mobile 2x2 Strip Layout (< 768px) */
@media (max-width: 480px) {
  .landing-top-bar { min-height: 3.45rem; }
}

@media (max-width: 768px) {
  .category-landing-view {
    padding: 1.5rem 1rem;
  }
  .landing-hero-heading {
    margin-top: -0.6rem;
    margin-bottom: 0.85rem;
  }
  .landing-title {
    margin-bottom: 0;
  }
  .landing-title-main {
    font-size: clamp(1.75rem, 7.5vw, 2.25rem);
    line-height: 1.12;
  }
  .landing-title-extension {
    margin-top: 0.35rem;
    font-size: clamp(1.02rem, 4.4vw, 1.32rem);
    line-height: 1.28;
    text-wrap: balance;
  }
  .landing-title-extension > span {
    display: inline;
  }
  .category-windows-group {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    width: 100%;
    max-width: 340px;
  }
  .category-panel,
  .category-strip {
    width: 100% !important;
    height: 220px;
    border-radius: 0px !important;
  }
  .category-windows-group > .category-panel:last-child:nth-child(odd) {
    grid-column: 1 / -1;
    max-width: calc(50% - 6px);
    justify-self: center;
  }
}