/* --- Global Reset & Variables --- */

:root {
  --app-gap: 24px;
  --app-radius: 20px;
  --sidebar-width: 280px;
  --topbar-height: 80px;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: #111827;
  overflow: hidden;
}

/* --- Video Background & Overlay --- */

.bg-video {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -2;
}

.bg-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(17,24,39,0.9) 0%, rgba(17,24,39,0.5) 50%, rgba(17,24,39,0.8) 100%);
  z-index: -1;
  pointer-events: none;
}

/* --- Frosted Glass Reusable Class --- */

.glass-panel {
  background-color: rgba(31, 41, 55, 0.65);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   THE FLOATING ISLAND LAYOUT MATH
   ========================================================================== */

/* 1. The Sidebar Island */

.island-sidebar {
  position: fixed;
  top: var(--app-gap);
  bottom: var(--app-gap);
  left: var(--app-gap);
  width: var(--sidebar-width);
  border-radius: var(--app-radius);
  overflow-y: auto;
  z-index: 100;
}

/* 2. The Top Bar Island */

.island-topbar {
  position: fixed;
  top: var(--app-gap);
  left: calc(var(--sidebar-width) + var(--app-gap) + var(--app-gap));
  right: var(--app-gap);
  height: var(--topbar-height);
  border-radius: var(--app-radius);
  z-index: 100;
}

/* 3. The Main Content Island */

.island-content {
  position: absolute;
  top: calc(var(--topbar-height) + var(--app-gap) + var(--app-gap));
  bottom: var(--app-gap);
  left: calc(var(--sidebar-width) + var(--app-gap) + var(--app-gap));
  right: var(--app-gap);
  border-radius: var(--app-radius);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: #4b5563 transparent;
  z-index: 10;
}

/* ==========================================================================
   MOBILE OVERRIDES (Fixed alignment and centering)
   ========================================================================== */

@media (max-width: 768px) {
  body {
    overflow-y: auto;
    overflow-x: hidden;
  }
}

@media (max-width: 768px) {
  .island-sidebar {
    display: none !important;
  }
}

@media (max-width: 768px) {
  .island-topbar {
    position: relative;
    top: 0;
    left: 0;
    right: 0;
    margin: var(--app-gap) auto;
    width: calc(100% - (var(--app-gap) * 2));
    height: auto;
    min-height: var(--topbar-height);
    padding: 15px 0;
  }
}

@media (max-width: 768px) {
  .island-content {
    position: relative;
    top: 0;
    left: 0;
    right: 0;
    margin: 0 auto var(--app-gap) auto;
    width: calc(100% - (var(--app-gap) * 2));
    overflow-y: visible;
  }
}

/* --- Navigation Link Styling --- */

.top-link {
  color: #cbd5e1;
  text-decoration: none;
  font-weight: 600;
  padding: 0.5rem;
  transition: 0.3s;
  border-bottom: 2px solid transparent;
  text-shadow: 0 2px 4px rgba(0,0,0,0.8);
}

.top-link:hover, .top-link.active {
  color: #fff;
  border-bottom-color: #60a5fa;
}

.side-link {
  color: #cbd5e1;
  text-decoration: none;
  font-weight: 600;
  transition: 0.3s;
  border-left: 3px solid transparent;
  text-shadow: 0 2px 4px rgba(0,0,0,0.8);
}

.side-link:hover {
  background: rgba(255,255,255,0.05);
  color: #fff;
  border-left-color: #60a5fa;
}

.side-link.active {
  background: rgba(255,255,255,0.1);
  color: #fff;
  border-left-color: #60a5fa;
}

/* --- Utilities & Aesthetics --- */

.tracking-widest {
  letter-spacing: 0.15em;
}

.text-shadow {
  text-shadow: 0 2px 4px rgba(0,0,0,0.8);
}

.text-shadow-strong {
  text-shadow: 0 4px 12px rgba(0,0,0,0.9);
}

.custom-tag {
  box-shadow: 0 4px 6px rgba(0,0,0,0.4);
  transition: transform 0.2s;
}

.custom-tag:hover {
  transform: scale(1.05);
}

.hover-invert:hover {
  background-color: #fff !important;
  color: #000 !important;
}

/* Scroll Animation Classes */

.transition-fade {
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.translate-y-50 {
  transform: translateY(30px);
}

.translate-middle-y-0 {
  transform: translateY(0);
}

/* --- Your Custom Skyline Animations --- */

.skyline-wrapper {
  pointer-events: none;
}

.building {
  background-color: #1f2937;
  border-radius: 0.5rem 0.5rem 0 0;
  position: relative;
}

.building-roof {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1rem;
  background-color: rgba(75, 85, 99, 0.8);
  border-radius: 0.5rem 0.5rem 0 0;
}

.building-alt {
  background-color: #374151;
}

.b-sm {
  width: 4rem;
  height: 10rem;
}

.b-md {
  width: 5rem;
  height: 14rem;
}

.b-lg {
  width: 6rem;
  height: 20rem;
}

.b-xl {
  width: 6rem;
  height: 24rem;
}

.window-light {
  position: absolute;
  width: 1rem;
  height: 1rem;
  background-color: #fde047;
  border-radius: 2px;
  box-shadow: 0 0 15px 2px #fde047;
}

.w-1 {
  top: 2rem;
  left: 50%;
  transform: translateX(-50%);
}

.w-2 {
  top: 6rem;
  left: 1rem;
}

@keyframes swing {
  0% {
    transform: rotate(-2deg);
  }
  100% {
    transform: rotate(2deg);
  }
}

.crane-base {
  position: absolute;
  top: -6rem;
  left: 50%;
  transform: translateX(-50%);
  width: 1rem;
  height: 6rem;
  background-color: #4b5563;
}

.crane-arm {
  position: absolute;
  top: 0;
  left: -8rem;
  width: 16rem;
  height: 0.5rem;
  background-color: #4b5563;
  transform-origin: right center;
  animation: swing 8s ease-in-out infinite alternate;
}

.crane-line {
  position: absolute;
  top: 100%;
  left: 2rem;
  width: 2px;
  height: 6rem;
  background-color: #6b7280;
}

.crane-hook {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  width: 1rem;
  height: 1rem;
  background-color: #374151;
}