:root {
  --bg: #000500;
  --bg-deep: #000300;
  --panel: rgba(0, 20, 0, 0.66);
  --panel-strong: rgba(0, 16, 0, 0.92);
  --green: #00ff41;
  --green-dim: #00cc33;
  --green-bright: #66ff88;
  --green-dark: #003b00;
  --amber: #ffb000;
  --line-green: rgba(0, 255, 65, 0.25);
  --text: #d0ffd0;
  --text-dim: rgba(160, 255, 160, 0.5);
  --muted: rgba(100, 220, 100, 0.45);
  --muted-strong: rgba(160, 255, 160, 0.75);
  --shadow: rgba(0, 0, 0, 0.85);
  --transition-fast: 0.18s ease;
  --transition-med: 0.32s ease;
  --mono: 'JetBrains Mono', 'Consolas', ui-monospace, monospace;
  --display: 'Orbitron', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--text);
  background:
    radial-gradient(ellipse at 75% 90%, rgba(0, 255, 65, 0.06) 0%, transparent 40%),
    radial-gradient(ellipse at 10% 10%, rgba(0, 255, 65, 0.04) 0%, transparent 38%),
    radial-gradient(ellipse at 50% 50%, rgba(0, 180, 40, 0.03) 0%, transparent 50%),
    linear-gradient(160deg, #000300 0%, #001a00 50%, #000300 100%);
  font-family: var(--mono);
}

button, input { font: inherit; }
button { cursor: pointer; border: none; background: none; color: inherit; }

/* ── AMBIENT LAYERS ── */
#starfield, .spotlight, .scanlines, .grain {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
}
#starfield { z-index: 0; opacity: 0.9; }
.spotlight {
  z-index: 1;
  background: radial-gradient(circle at var(--mx, 50%) var(--my, 24%), rgba(0, 255, 65, 0.06) 0%, transparent 28rem);
  mix-blend-mode: screen;
  transition: background 0.05s linear;
}
.scanlines {
  z-index: 2;
  opacity: 0.06;
  background-image: repeating-linear-gradient(0deg, transparent 0 2px, rgba(0, 255, 65, 0.5) 2px 3px);
}
.grain {
  z-index: 2;
  opacity: 0.03;
  background-image: repeating-radial-gradient(circle at 17% 29%, rgba(0, 255, 65, 0.25) 0 1px, transparent 1px 4px);
}

/* ── LOADING SCREEN ── */
.loading {
  position: fixed; inset: 0; z-index: 50;
  display: grid; place-items: center;
  background: rgba(0, 3, 0, 0.97);
  backdrop-filter: blur(18px);
  transition: opacity 0.5s ease, visibility 0.5s ease;
  will-change: opacity, visibility;
}
.loading.done { opacity: 0; visibility: hidden; pointer-events: none; }

.loading-card {
  width: min(90vw, 460px);
  padding: 40px 36px 34px;
  border: 1px solid var(--line-green);
  border-radius: 4px;
  background: linear-gradient(155deg, rgba(0, 16, 0, 0.97) 0%, rgba(0, 5, 0, 0.97) 100%);
  box-shadow:
    0 32px 100px rgba(0, 0, 0, 0.80),
    0 0 60px rgba(0, 255, 65, 0.08),
    inset 0 1px 0 rgba(0, 255, 65, 0.06);
  text-align: center;
}

.loading-mark {
  display: inline-grid; place-items: center;
  width: 80px; height: 80px; margin-bottom: 22px;
  border: 2px solid var(--green);
  border-radius: 2px;
  color: var(--green-bright);
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: 0.04em;
  text-shadow: 0 0 24px rgba(0, 255, 65, 0.6);
  box-shadow: 0 0 32px rgba(0, 255, 65, 0.15), inset 0 0 20px rgba(0, 255, 65, 0.05);
  animation: markPulse 2.4s ease-in-out infinite;
}
@keyframes markPulse {
  0%, 100% { box-shadow: 0 0 32px rgba(0, 255, 65, 0.12), inset 0 0 20px rgba(0, 255, 65, 0.04); }
  50% { box-shadow: 0 0 48px rgba(0, 255, 65, 0.25), inset 0 0 28px rgba(0, 255, 65, 0.08); }
}

.loading-title { margin-bottom: 24px; font-size: 0.82rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--green); }
.loading-card .loading-title.clickable {
  cursor: pointer;
  animation: clickPulse 1.6s ease-in-out infinite;
  color: var(--green-bright);
  text-shadow: 0 0 20px rgba(0, 255, 65, 0.3);
}
@keyframes clickPulse {
  0%, 100% { opacity: 0.7; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.05); }
}

.loading-bar { height: 5px; overflow: hidden; border-radius: 2px; background: rgba(0, 255, 65, 0.06); }
.loading-bar span {
  display: block; width: 0%; height: 100%;
  background: linear-gradient(90deg, var(--green-dark), var(--green), var(--green-bright));
  box-shadow: 0 0 24px rgba(0, 255, 65, 0.5);
  border-radius: 2px;
  transition: width 0.38s ease;
}
.loading-text { margin-top: 14px; color: var(--muted); font-size: 0.74rem; }

/* ── MASTHEAD ── */
.masthead {
  position: sticky; top: 0; z-index: 30;
  display: flex; justify-content: space-between; align-items: center; gap: 18px;
  padding: 16px clamp(16px, 3vw, 42px);
  border-bottom: 1px solid var(--line-green);
  background: linear-gradient(180deg, rgba(0, 3, 0, 0.92) 0%, rgba(0, 3, 0, 0.50) 100%);
  backdrop-filter: blur(24px) saturate(150%);
}

.brand { display: flex; align-items: center; gap: 14px; text-align: left; transition: opacity var(--transition-fast); }
.brand:hover { opacity: 0.86; }

.brand-logo {
  display: inline-grid; place-items: center;
  width: 46px; height: 50px;
  border: 2px solid var(--green);
  border-radius: 2px;
  color: var(--green-bright);
  font-family: var(--display);
  font-weight: 800;
  font-size: 0.95rem;
  box-shadow: 0 0 28px rgba(0, 255, 65, 0.12), inset 0 0 24px rgba(0, 255, 65, 0.04);
  flex-shrink: 0;
}

.brand strong {
  display: block;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(0.82rem, 1.7vw, 1.05rem);
  letter-spacing: 0.03em;
  line-height: 1.15;
  text-transform: uppercase;
}
.brand em { display: block; margin-top: 3px; color: var(--green-dim); font-style: normal; font-size: 0.66rem; letter-spacing: 0.10em; text-transform: uppercase; }

/* ── TOP NAV BUTTONS ── */
.top-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }
.top-actions button {
  border: 1px solid var(--line-green);
  color: var(--green);
  background: linear-gradient(180deg, rgba(0, 16, 0, 0.80) 0%, rgba(0, 5, 0, 0.80) 100%);
  border-radius: 2px;
  padding: 9px 16px;
  font-size: 0.72rem;
  font-weight: 600;
  box-shadow: inset 0 1px 0 rgba(0, 255, 65, 0.04), 0 8px 24px rgba(0, 0, 0, 0.30);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.top-actions button:hover {
  transform: translateY(-1px);
  border-color: var(--green-bright);
  box-shadow: 0 0 24px rgba(0, 255, 65, 0.20), inset 0 1px 0 rgba(0, 255, 65, 0.06);
}
.top-actions button:active { transform: translateY(0); }

/* ── VIEWER ── */
.masthead, .viewer, .footer-note { position: relative; z-index: 5; }

.viewer {
  max-width: 1680px;
  margin: 0 auto;
  padding: 20px clamp(14px, 3vw, 42px) 16px;
}

.viewer-stage {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(0, 255, 65, 0.03) 0%, transparent 34rem),
    rgba(0, 3, 0, 0.50);
  border: 1px solid var(--line-green);
  border-radius: 4px;
  box-shadow:
    0 36px 100px rgba(0, 0, 0, 0.55),
    inset 0 0 0 1px rgba(0, 255, 65, 0.04),
    0 0 60px rgba(0, 255, 65, 0.03);
  min-height: 500px;
  perspective: 2000px;
  overflow: hidden;
}

.viewer-stage img {
  display: block;
  width: 100%;
  height: auto;
  max-height: calc(100vh - 240px);
  object-fit: contain;
  border-radius: 2px;
  -webkit-user-drag: none;
  user-select: none;
  background: transparent;
  backface-visibility: hidden;
}

/* ── PAGE FLIP OVERLAY ── */
.flip-overlay {
  position: absolute;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: 5;
  pointer-events: none;
  backface-visibility: hidden;
  transform-style: preserve-3d;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0;
  display: none;
  will-change: transform, opacity;
}
.flip-overlay.next {
  display: block;
  left: 0;
  transform-origin: left center;
  animation: flipForward 0.7s cubic-bezier(0.645, 0.045, 0.355, 1) forwards;
  box-shadow: -4px 0 30px rgba(0,0,0,0.4);
}
.flip-overlay.prev {
  display: block;
  right: 0;
  transform-origin: right center;
  animation: flipBackward 0.7s cubic-bezier(0.645, 0.045, 0.355, 1) forwards;
  box-shadow: 4px 0 30px rgba(0,0,0,0.4);
}
@keyframes flipForward {
  0%   { transform: rotateY(2deg) scaleX(1); opacity: 1; }
  40%  { transform: rotateY(-90deg) scaleX(1.02); opacity: 0.85; box-shadow: -12px 0 50px rgba(0,0,0,0.55); }
  100% { transform: rotateY(-180deg) scaleX(0.98); opacity: 0.4; box-shadow: -4px 0 20px rgba(0,0,0,0.2); }
}
@keyframes flipBackward {
  0%   { transform: rotateY(-2deg) scaleX(1); opacity: 1; }
  40%  { transform: rotateY(90deg) scaleX(1.02); opacity: 0.85; box-shadow: 12px 0 50px rgba(0,0,0,0.55); }
  100% { transform: rotateY(180deg) scaleX(0.98); opacity: 0.4; box-shadow: 4px 0 20px rgba(0,0,0,0.2); }
}

/* ── FOLD SHADOW ── */
.flip-overlay.next::after,
.flip-overlay.prev::after {
  content: '';
  position: absolute;
  top: 0; bottom: 0;
  width: 100px;
  z-index: 2;
  pointer-events: none;
  opacity: 0;
  animation: foldShadow 0.7s ease forwards;
}
.flip-overlay.next::after {
  right: -1px;
  background: linear-gradient(to left, rgba(0,0,0,0.35), transparent);
}
.flip-overlay.prev::after {
  left: -1px;
  background: linear-gradient(to right, rgba(0,0,0,0.35), transparent);
}
@keyframes foldShadow {
  0%   { opacity: 0; }
  15%  { opacity: 1; }
  55%  { opacity: 0.5; }
  100% { opacity: 0; }
}

/* ── GREEN FOLD GLOW LINE ── */
.flip-overlay.next::before,
.flip-overlay.prev::before {
  content: '';
  position: absolute;
  top: 0; bottom: 0;
  width: 3px;
  z-index: 3;
  pointer-events: none;
  opacity: 0;
  animation: foldGlow 0.7s ease forwards;
}
.flip-overlay.next::before {
  right: -1px;
  background: linear-gradient(to bottom, transparent, rgba(0,255,65,0.5), transparent);
}
.flip-overlay.prev::before {
  left: -1px;
  background: linear-gradient(to bottom, transparent, rgba(0,255,65,0.5), transparent);
}
@keyframes foldGlow {
  0%   { opacity: 0; }
  25%  { opacity: 1; }
  50%  { opacity: 0.4; }
  100% { opacity: 0; }
}

/* ── ENERGY FLASH ── */
.energy-flash {
  position: absolute;
  inset: 0;
  z-index: 6;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.05s;
}
.energy-flash.on {
  animation: energyBurst 0.4s ease-out forwards;
}
@keyframes energyBurst {
  0%   { background: radial-gradient(circle at 50% 50%, rgba(0,255,65,0.25), transparent 60%); opacity: 1; }
  100% { background: radial-gradient(circle at 50% 50%, rgba(0,255,65,0), transparent 80%); opacity: 0; }
}

/* ── CORNER BRACKETS ── */
.corner-bracket {
  position: absolute;
  z-index: 7;
  pointer-events: none;
  width: 22px; height: 22px;
  opacity: 0.65;
}
.corner-bracket::before,
.corner-bracket::after {
  content: '';
  position: absolute;
  background: var(--green);
}
.corner-bracket::before {
  width: 100%; height: 2px;
}
.corner-bracket::after {
  width: 2px; height: 100%;
}
.corner-bracket.top-left    { top: 10px; left: 10px; }
.corner-bracket.top-left::before    { top: 0; left: 0; }
.corner-bracket.top-left::after     { top: 0; left: 0; }
.corner-bracket.top-right   { top: 10px; right: 10px; }
.corner-bracket.top-right::before   { top: 0; right: 0; }
.corner-bracket.top-right::after    { top: 0; right: 0; }
.corner-bracket.bottom-left { bottom: 10px; left: 10px; }
.corner-bracket.bottom-left::before { bottom: 0; left: 0; }
.corner-bracket.bottom-left::after  { bottom: 0; left: 0; }
.corner-bracket.bottom-right { bottom: 10px; right: 10px; }
.corner-bracket.bottom-right::before { bottom: 0; right: 0; }
.corner-bracket.bottom-right::after  { bottom: 0; right: 0; }

/* ── VIEWER PULSE BORDER ── */
.viewer-stage {
  animation: borderPulse 4s ease-in-out infinite;
}
@keyframes borderPulse {
  0%, 100% { box-shadow:
      0 36px 100px rgba(0,0,0,0.55),
      inset 0 0 0 1px rgba(0,255,65,0.04),
      0 0 60px rgba(0,255,65,0.03); }
  50% { box-shadow:
      0 36px 100px rgba(0,0,0,0.55),
      inset 0 0 0 1px rgba(0,255,65,0.12),
      0 0 80px rgba(0,255,65,0.08),
      0 0 4px rgba(0,255,65,0.3); }
}
.viewer-stage img {
  transition: transform 0.08s, filter 0.08s, opacity 0.08s;
}

/* ── NAV BUTTONS ── */
.nav-btn {
  position: absolute;
  top: 0;
  bottom: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.25s ease;
  width: 10vw;
  min-width: 60px;
  max-width: 140px;
}
.nav-btn:hover { background: rgba(0, 255, 65, 0.035); }
.nav-btn:active { background: rgba(0, 255, 65, 0.06); }
.nav-btn svg {
  width: 36px;
  height: 36px;
  color: var(--green);
  opacity: 0.25;
  filter: drop-shadow(0 0 8px rgba(0, 0, 0, 0.6));
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.nav-btn:hover svg { opacity: 0.6; transform: scale(1.15); }
.nav-btn:active svg { transform: scale(0.95); }
.nav-left { left: 0; }
.nav-right { right: 0; }

/* ── CONTROL STRIP ── */
.control-strip {
  display: grid;
  grid-template-columns: auto minmax(120px, 1fr) auto auto;
  gap: 14px;
  align-items: center;
  margin-top: 20px;
  padding: 16px 18px;
  border: 1px solid rgba(0, 255, 65, 0.06);
  border-radius: 4px;
  background: rgba(0, 8, 0, 0.60);
  backdrop-filter: blur(18px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.30);
}
.control-strip button {
  border: 1px solid var(--line-green);
  color: var(--green);
  background: linear-gradient(180deg, rgba(0, 16, 0, 0.80) 0%, rgba(0, 5, 0, 0.80) 100%);
  border-radius: 2px;
  padding: 9px 20px;
  font-size: 0.74rem;
  font-weight: 600;
  box-shadow: inset 0 1px 0 rgba(0, 255, 65, 0.04), 0 8px 24px rgba(0, 0, 0, 0.26);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.control-strip button:hover { transform: translateY(-1px); border-color: var(--green-bright); box-shadow: 0 0 20px rgba(0, 255, 65, 0.14); }
.control-strip button:disabled { opacity: 0.18; cursor: not-allowed; transform: none; }

.page-indicator {
  font-family: var(--display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--green-bright);
  text-shadow: 0 0 16px rgba(0, 255, 65, 0.3);
  text-align: right;
  white-space: nowrap;
}

input[type="range"] {
  appearance: none; width: 100%; height: 5px; border-radius: 2px;
  background: linear-gradient(90deg, var(--green) var(--progress, 0%), rgba(0,255,65,.07) var(--progress, 0%));
  outline: none; cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  appearance: none; width: 18px; height: 18px; border: 2px solid #000500; border-radius: 2px;
  background: var(--green-bright); box-shadow: 0 0 20px rgba(0, 255, 65, 0.5); transition: transform var(--transition-fast);
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.14); }
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px; border: 2px solid #000500; border-radius: 2px;
  background: var(--green-bright); box-shadow: 0 0 20px rgba(0, 255, 65, 0.5);
}

/* ── FOOTER ── */
.footer-note {
  display: flex; justify-content: center; flex-wrap: wrap; gap: 14px;
  padding: 12px 20px 32px; color: rgba(0, 255, 65, 0.20); font-size: 0.64rem;
  letter-spacing: 0.10em; text-transform: uppercase;
}
.footer-note span { display: flex; align-items: center; gap: 10px; }
.footer-note span::before {
  content: ""; display: inline-block; width: 4px; height: 4px; border-radius: 0;
  background: var(--green); box-shadow: 0 0 10px rgba(0, 255, 65, 0.7); flex-shrink: 0;
}

/* ── RESPONSIVE ── */
@media (max-width: 1060px) {
  .nav-btn { width: 12vw; min-width: 50px; }
  .nav-btn svg { width: 28px; height: 28px; }
}

@media (max-width: 768px) {
  .masthead {
    flex-direction: row;
    padding: 10px 12px;
    gap: 8px;
  }
  .brand-logo { width: 34px; height: 36px; font-size: 0.75rem; }
  .brand strong { font-size: 0.7rem; }
  .brand em { font-size: 0.55rem; }
  .brand { gap: 8px; }
  .top-actions button { font-size: 0.6rem; padding: 6px 10px; }

  .viewer { padding: 10px 8px 8px; }
  .viewer-stage { min-height: 200px; border-radius: 4px; }
  .viewer-stage img { max-height: calc(100vh - 180px); }

  .nav-btn { min-width: 44px; width: 14vw; }
  .nav-btn svg { width: 24px; height: 24px; opacity: 0.4; }

  .control-strip {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    padding: 10px 12px;
    margin-top: 10px;
  }
  .control-strip button { font-size: 0.65rem; padding: 8px 12px; }
  .page-indicator { text-align: center; font-size: 0.7rem; }

  .footer-note { font-size: 0.5rem; padding: 8px 12px 20px; gap: 6px; }
}

@media (max-width: 480px) {
  .masthead { padding: 8px 10px; }
  .brand-logo { width: 28px; height: 30px; font-size: 0.65rem; }
  .brand strong { font-size: 0.6rem; }
  .brand em { font-size: 0.5rem; }

  .viewer { padding: 6px 4px 6px; }
  .viewer-stage { min-height: 140px; }
  .viewer-stage img { max-height: calc(100vh - 160px); }

  .nav-btn { min-width: 36px; width: 18vw; }
  .nav-btn svg { width: 20px; height: 20px; }

  .control-strip { padding: 8px 10px; gap: 6px; }
  .control-strip button { font-size: 0.6rem; padding: 6px 10px; }
  .page-indicator { font-size: 0.6rem; }

  .footer-note { font-size: 0.45rem; padding: 6px 8px 16px; gap: 4px; }
}

/* Horizontal phone / small tablet in landscape */
@media (max-height: 500px) {
  .viewer-stage { min-height: 120px; }
  .viewer-stage img { max-height: calc(100vh - 140px); }
  .control-strip { padding: 6px 10px; margin-top: 6px; }
  .masthead { padding: 6px 10px; }
  .brand-logo { width: 26px; height: 28px; font-size: 0.6rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}