:root {
  --darkroom-black: #17130F;
  --safelight-red: #E1432A;
  --paper-white: #F3EDE1;
  --proof-gray: #8A8178;

  --font-display: "Big Shoulders Display", sans-serif;
  --font-body: "Noto Sans SC", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--darkroom-black);
  color: var(--paper-white);
  font-family: var(--font-body);
  line-height: 1.5;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

:focus-visible {
  outline: 2px solid var(--safelight-red);
  outline-offset: 2px;
}

/* Corner registration marks — signature element used on upload areas and result frames */
.corner-frame {
  position: relative;
}
.corner-frame::before {
  content: "";
  position: absolute;
  inset: 6px;
  pointer-events: none;
  background:
    linear-gradient(to right, var(--safelight-red) 2px, transparent 2px) 0 0,
    linear-gradient(to right, var(--safelight-red) 2px, transparent 2px) 0 100%,
    linear-gradient(to left, var(--safelight-red) 2px, transparent 2px) 100% 0,
    linear-gradient(to left, var(--safelight-red) 2px, transparent 2px) 100% 100%,
    linear-gradient(to bottom, var(--safelight-red) 2px, transparent 2px) 0 0,
    linear-gradient(to bottom, var(--safelight-red) 2px, transparent 2px) 100% 0,
    linear-gradient(to top, var(--safelight-red) 2px, transparent 2px) 0 100%,
    linear-gradient(to top, var(--safelight-red) 2px, transparent 2px) 100% 100%;
  background-repeat: no-repeat;
  background-size: 16px 16px;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--proof-gray);
}

.site-header__model {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: 0.05em;
}

.site-header__mode {
  font-family: var(--font-mono);
  color: var(--proof-gray);
  font-size: 0.9rem;
}

.mode-dial {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 2rem;
}

.mode-dial button {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.03em;
  background: transparent;
  color: var(--proof-gray);
  border: 1px solid var(--proof-gray);
  border-bottom: 3px solid transparent;
  border-radius: 2px;
  padding: 0.5rem 1.5rem;
  cursor: pointer;
}

.mode-dial button.is-active {
  color: var(--paper-white);
  border-color: var(--proof-gray);
  border-bottom-color: var(--safelight-red);
}

main {
  padding: 0 2rem 3rem;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(280px, 380px) 1fr;
  gap: 2rem;
}

@media (max-width: 720px) {
  .workspace {
    grid-template-columns: 1fr;
  }
}

.data-sheet {
  background: var(--paper-white);
  color: var(--darkroom-black);
  border-radius: 4px;
  padding: 1.5rem;
  align-self: start;
}

.proof-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
  align-content: start;
  min-height: 200px;
}

/* Guard: the native [hidden] attribute is overridden by the .workspace
   display:grid rule above (author styles beat UA styles regardless of
   specificity), so a hidden panel with class="workspace" would otherwise
   still render. Restores expected hidden behavior. */
.workspace[hidden] {
  display: none;
}

.field {
  margin-bottom: 1.25rem;
}

.field label,
.field__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--proof-gray);
  margin-bottom: 0.4rem;
}

.field textarea,
.field select,
.field input[type="number"] {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.6rem;
  border: 1px solid var(--proof-gray);
  border-radius: 2px;
  background: #fff;
  color: var(--darkroom-black);
}

.field textarea {
  resize: vertical;
}

.segmented {
  display: flex;
  border: 1px solid var(--proof-gray);
  border-radius: 999px;
  overflow: hidden;
  width: fit-content;
}

.segmented label {
  padding: 0.4rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--darkroom-black);
}

.segmented input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.segmented input:checked + label,
.segmented label:has(input:checked) {
  background: var(--safelight-red);
  color: var(--paper-white);
}

.field input[type="range"] {
  width: 100%;
  accent-color: var(--safelight-red);
}

.btn-develop {
  width: 100%;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: 0.08em;
  padding: 0.8rem;
  background: var(--safelight-red);
  color: var(--paper-white);
  border: none;
  border-radius: 2px;
  cursor: pointer;
}

.btn-develop:disabled {
  background: var(--proof-gray);
  cursor: not-allowed;
}

.proof-card {
  margin: 0;
  background: var(--paper-white);
  color: var(--darkroom-black);
  padding: 10px 10px 32px;
  position: relative;
  animation: proof-develop 0.5s ease-out backwards;
  animation-delay: var(--develop-delay, 0s);
}

@keyframes proof-develop {
  from {
    opacity: 0;
    transform: rotate(0deg) scale(0.96) translateY(6px);
    filter: brightness(1.8);
  }
  to {
    opacity: 1;
    transform: rotate(var(--tilt, 0deg)) scale(1) translateY(0);
    filter: brightness(1);
  }
}

.proof-card img {
  width: 100%;
  display: block;
}

.proof-card__caption {
  position: absolute;
  bottom: 8px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--proof-gray);
}

.proof-card__download {
  position: absolute;
  bottom: 8px;
  left: 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--darkroom-black);
  text-decoration: none;
}

.safelight-glow {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem;
  font-family: var(--font-mono);
  color: var(--safelight-red);
  animation: safelight-pulse 1.6s ease-in-out infinite;
}

@keyframes safelight-pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

.proof-wall--loading {
  box-shadow: inset 0 0 120px rgba(225, 67, 42, 0.15);
}

.proof-wall__error {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  color: var(--safelight-red);
  border: 1px dashed var(--safelight-red);
  padding: 1rem;
}

.upload-zone {
  position: relative;
  padding: 2rem 1rem;
  text-align: center;
  cursor: pointer;
  min-height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.upload-zone--dragover {
  background: rgba(225, 67, 42, 0.08);
}

.upload-zone__prompt {
  font-family: var(--font-mono);
  color: var(--proof-gray);
  margin: 0;
  font-size: 0.9rem;
}

.upload-zone__preview-wrap {
  position: relative;
  width: 100%;
}

.upload-zone__preview-wrap img {
  width: 100%;
  display: block;
}

.corner-frame--dashed {
  position: relative;
}
.corner-frame--dashed::before {
  content: "";
  position: absolute;
  inset: 6px;
  pointer-events: none;
  background:
    repeating-linear-gradient(to bottom, var(--safelight-red) 0 2px, transparent 2px 4px) 0 0,
    repeating-linear-gradient(to bottom, var(--safelight-red) 0 2px, transparent 2px 4px) 0 100%,
    repeating-linear-gradient(to bottom, var(--safelight-red) 0 2px, transparent 2px 4px) 100% 0,
    repeating-linear-gradient(to bottom, var(--safelight-red) 0 2px, transparent 2px 4px) 100% 100%,
    repeating-linear-gradient(to right, var(--safelight-red) 0 2px, transparent 2px 4px) 0 0,
    repeating-linear-gradient(to right, var(--safelight-red) 0 2px, transparent 2px 4px) 100% 0,
    repeating-linear-gradient(to right, var(--safelight-red) 0 2px, transparent 2px 4px) 0 100%,
    repeating-linear-gradient(to right, var(--safelight-red) 0 2px, transparent 2px 4px) 100% 100%;
  background-repeat: no-repeat;
  background-size:
    2px 16px, 2px 16px, 2px 16px, 2px 16px,
    16px 2px, 16px 2px, 16px 2px, 16px 2px;
}

.mask-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
}

.mask-toggle {
  display: block;
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--darkroom-black);
  cursor: pointer;
}

.mask-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.mask-controls[hidden] {
  display: none;
}

.mask-controls input[type="range"] {
  accent-color: var(--safelight-red);
}

.mask-controls button {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: transparent;
  border: 1px solid var(--proof-gray);
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  cursor: pointer;
  color: var(--darkroom-black);
}