/* Design tokens (UI.md) */
:root {
  --ink: #1a2332;
  --paper: #e6eaf0;
  --plate: #f7f8fa;
  --line: #d5dbe3;
  --accent: #0e6b6b;
  --danger: #9c3b3b;

  --font-display: "Syne", sans-serif;
  --font-body: "Figtree", sans-serif;

  --side-padding: 20px;
  --max-content: 480px;
  --radius: 12px;

  --safe-area-inset-top: 0px;
  --safe-area-inset-right: 0px;
  --safe-area-inset-bottom: 0px;
  --safe-area-inset-left: 0px;
  --content-safe-area-inset-top: 0px;
  --content-safe-area-inset-right: 0px;
  --content-safe-area-inset-bottom: 0px;
  --content-safe-area-inset-left: 0px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  min-height: 100dvh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.app {
  min-height: 100%;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.icon {
  display: block;
  flex-shrink: 0;
  color: var(--ink);
}

/* Locked */
.locked {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding:
    calc(var(--content-safe-area-inset-top) + var(--safe-area-inset-top) + 24px)
    calc(var(--side-padding) + var(--safe-area-inset-right) + var(--content-safe-area-inset-right))
    calc(var(--content-safe-area-inset-bottom) + var(--safe-area-inset-bottom) + 24px)
    calc(var(--side-padding) + var(--safe-area-inset-left) + var(--content-safe-area-inset-left));
}

.locked__inner {
  width: 100%;
  max-width: var(--max-content);
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.locked__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 28px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.locked__line {
  margin: 0;
  font-weight: 400;
  color: var(--ink);
  opacity: 0.85;
}

/* Studio */
.studio {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

.header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--paper);
  padding-top: calc(var(--safe-area-inset-top) + var(--content-safe-area-inset-top));
  padding-left: calc(var(--side-padding) + var(--safe-area-inset-left) + var(--content-safe-area-inset-left));
  padding-right: calc(var(--side-padding) + var(--safe-area-inset-right) + var(--content-safe-area-inset-right));
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.header__inner {
  max-width: var(--max-content);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.header__mark {
  display: block;
  flex-shrink: 0;
  color: var(--ink);
}

.header__word {
  font-weight: 560;
  font-size: 15px;
  letter-spacing: -0.01em;
}

.studio__main {
  flex: 1;
  max-width: var(--max-content);
  width: 100%;
  margin: 0 auto;
  padding:
    16px
    calc(var(--side-padding) + var(--safe-area-inset-right) + var(--content-safe-area-inset-right))
    calc(24px + var(--safe-area-inset-bottom) + var(--content-safe-area-inset-bottom))
    calc(var(--side-padding) + var(--safe-area-inset-left) + var(--content-safe-area-inset-left));
}

[hidden] {
  display: none !important;
}

/* Studio form (B004) */
.studio__form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.field__label {
  display: block;
  margin: 0 0 8px;
  font-weight: 560;
  font-size: 15px;
  letter-spacing: -0.01em;
}

.field__helper {
  margin: -4px 0 8px;
  font-size: 14px;
  color: var(--ink);
  opacity: 0.72;
}

.field__error {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--danger);
}

.textarea {
  display: block;
  width: 100%;
  min-height: 0;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--plate);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  resize: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.textarea::placeholder {
  color: var(--ink);
  opacity: 0.45;
}

.textarea:hover {
  border-color: color-mix(in srgb, var(--line) 60%, var(--ink));
}

.textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 35%, transparent);
}

.textarea--over-limit,
.textarea--over-limit:hover {
  border-color: var(--danger);
}

.textarea--over-limit:focus {
  border-color: var(--danger);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--danger) 35%, transparent);
}

.refs__thumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.refs__thumbs:empty {
  display: none;
}

.refs__thumb {
  position: relative;
  width: 72px;
  height: 72px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--plate);
}

.refs__thumb-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.refs__remove {
  position: absolute;
  top: 4px;
  right: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin: -10px -10px 0 0;
  padding: 0;
  border: none;
  border-radius: 8px;
  background: color-mix(in srgb, var(--paper) 92%, var(--ink));
  color: var(--ink);
  cursor: pointer;
  box-shadow: 0 1px 3px color-mix(in srgb, var(--ink) 12%, transparent);
  transition:
    background 0.15s ease,
    color 0.15s ease,
    transform 0.1s ease,
    box-shadow 0.15s ease;
}

.refs__remove:hover {
  background: var(--paper);
  color: var(--danger);
}

.refs__remove:active {
  transform: scale(0.96);
}

.refs__remove:focus {
  outline: none;
  box-shadow:
    0 0 0 2px var(--paper),
    0 0 0 4px var(--accent);
}

.refs__remove:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.refs__add {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 10px 16px;
  border: 1.5px dashed var(--line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition:
    border-color 0.15s ease,
    background 0.15s ease,
    color 0.15s ease,
    transform 0.1s ease,
    box-shadow 0.15s ease;
}

.refs__add:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--paper));
  color: var(--accent);
}

.refs__add:active {
  transform: scale(0.98);
  background: color-mix(in srgb, var(--accent) 14%, var(--paper));
}

.refs__add:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 35%, transparent);
}

.refs__add:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.colors {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.colors__item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.colors__name {
  font-size: 14px;
  font-weight: 400;
  color: var(--ink);
  opacity: 0.85;
}

.colors__input {
  appearance: none;
  -webkit-appearance: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  background: var(--plate);
  overflow: hidden;
}

.colors__input::-webkit-color-swatch-wrapper {
  padding: 0;
}

.colors__input::-webkit-color-swatch {
  border: none;
  border-radius: calc(var(--radius) - 2px);
}

.colors__input::-moz-color-swatch {
  border: none;
  border-radius: calc(var(--radius) - 2px);
}

.colors__input:hover {
  border-color: color-mix(in srgb, var(--line) 50%, var(--ink));
}

.colors__input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 35%, transparent);
}

.colors__input:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Plate (B007) */
.plate {
  position: relative;
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
  aspect-ratio: 1 / 1;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--plate);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.plate--ready {
  background: var(--plate-paper, var(--paper));
}

.plate--waiting .plate__placeholder {
  color: var(--line);
}

.plate__placeholder {
  margin: 0;
  text-align: center;
  font-size: 15px;
  color: var(--line);
  max-width: 16em;
}

.plate__svg-wrap {
  position: absolute;
  inset: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.plate__svg-inner {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
  transition: opacity 0.2s ease;
}

.plate__svg-inner--fade {
  opacity: 0;
}

.plate__svg-inner svg {
  display: block;
  width: 100%;
  height: 100%;
}

/* Actions (B007) */
.actions {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 12px;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  min-height: 44px;
  padding: 12px 20px;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-weight: 560;
  font-size: 16px;
  line-height: 1.25;
  cursor: pointer;
  transition:
    background 0.15s ease,
    color 0.15s ease,
    transform 0.1s ease,
    box-shadow 0.15s ease,
    opacity 0.15s ease;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
}

.btn--primary .btn__icon {
  color: #fff;
}

.btn--primary:hover:not(:disabled) {
  background: color-mix(in srgb, var(--accent) 88%, var(--ink));
}

.btn--primary:active:not(:disabled) {
  transform: scale(0.98);
  background: color-mix(in srgb, var(--accent) 78%, var(--ink));
}

.btn--primary:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--paper), 0 0 0 4px var(--accent);
}

.btn--primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn--secondary {
  background: var(--paper);
  color: var(--accent);
  border: 1.5px solid var(--accent);
}

.btn--secondary .btn__icon {
  color: var(--accent);
}

.btn--secondary:hover:not(:disabled) {
  background: color-mix(in srgb, var(--accent) 10%, var(--paper));
}

.btn--secondary:active:not(:disabled) {
  transform: scale(0.98);
  background: color-mix(in srgb, var(--accent) 16%, var(--paper));
}

.btn--secondary:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--paper), 0 0 0 4px var(--accent);
}

.btn--secondary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

@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;
  }
}