:root {
  --bg: #eef2f7;
  --surface: #ffffff;
  --surface-soft: #f5f8fc;
  --text: #102235;
  --muted: #5f7187;
  --border: #d5e0eb;
  --primary: #1665d8;
  --primary-dark: #0f4ea8;
  --secondary: #19324d;
  --secondary-dark: #112131;
  --success: #1a7d47;
  --success-bg: #ebfaef;
  --success-border: #c3e6cf;
  --warn: #8a5a06;
  --warn-bg: #fff4dd;
  --warn-border: #f0ddb5;
  --danger: #b23535;
  --danger-bg: #feecec;
  --danger-border: #efc3c3;
  --info: #245f9d;
  --info-bg: #edf5ff;
  --info-border: #c8daf4;
  --shadow: 0 20px 56px rgba(16, 34, 53, 0.08);
  --app-shell-max: 1180px;
  --rail-divider-color: rgba(213, 224, 235, 0.92);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  color: var(--text);
  font-family: "Segoe UI", "Noto Sans", Arial, sans-serif;
  background:
    radial-gradient(circle at 0% 0%, rgba(22, 101, 216, 0.11), transparent 30%),
    radial-gradient(circle at 100% 8%, rgba(39, 143, 255, 0.08), transparent 24%),
    var(--bg);
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 0.7rem 1rem;
  background: var(--primary);
  color: #ffffff;
  font-weight: 700;
  cursor: pointer;
  transition: background 140ms ease, border-color 140ms ease, color 140ms ease, transform 140ms ease;
}

button:hover:not(:disabled) {
  background: var(--primary-dark);
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(22, 101, 216, 0.18);
  outline-offset: 2px;
}

button.secondary {
  background: var(--secondary);
  border-color: var(--secondary);
}

button.secondary:hover:not(:disabled) {
  background: var(--secondary-dark);
}

button.ghost {
  background: #ffffff;
  color: #22364b;
  border-color: #bcccdc;
}

button.ghost:hover:not(:disabled) {
  background: #f4f8fc;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

input[type="text"],
input[type="number"],
select {
  width: 100%;
  border: 1px solid #c7d4e4;
  border-radius: 10px;
  padding: 0.72rem 0.8rem;
  background: #ffffff;
  color: inherit;
}

input[type="range"] {
  width: 100%;
}

progress {
  width: 100%;
  height: 12px;
}

.hidden {
  display: none !important;
}

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

.hero {
  padding-block: 2rem 1rem;
}

.panel,
.guide-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.panel {
  padding: 1rem;
}

.layout {
  display: grid;
  gap: 1rem;
  padding-bottom: 1.25rem;
}

@media (min-width: 1080px) {
  .layout {
    grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
    grid-template-areas:
      "intro intro"
      "queue controls"
      "preview controls";
    align-items: start;
  }

  .intro-panel {
    grid-area: intro;
  }

  .queue-panel {
    grid-area: queue;
  }

  .controls-panel {
    grid-area: controls;
    position: sticky;
    top: 1rem;
  }

  .preview-panel {
    grid-area: preview;
  }
}

.panel-head,
.section-intro {
  display: grid;
  gap: 0.4rem;
}

.section-intro--toggle {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  cursor: pointer;
  border-radius: 12px;
  padding: 0.15rem 0;
}

.section-intro--toggle:hover {
  color: #173c64;
}

.section-intro--toggle[aria-expanded="false"] {
  margin-bottom: 0;
}

.control-toggle__text {
  display: grid;
  gap: 0.4rem;
  min-width: 0;
}

.control-toggle__chevron {
  width: 0.8rem;
  height: 0.8rem;
  margin-top: 0.35rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 140ms ease;
}

.section-intro--toggle[aria-expanded="false"] .control-toggle__chevron {
  transform: rotate(-45deg);
}

.panel-head--split {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
}

.panel h2,
.guide-card h2,
.guide-card h3,
.tool-footer p {
  margin: 0;
}

.subtle {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.badge-row,
.button-row,
.toolbar-row,
.button-grid,
.share-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.pill,
.badge,
.status-pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.34rem 0.7rem;
  font-size: 0.9rem;
  font-weight: 700;
}

.pill,
.badge {
  background: #edf3fb;
  color: #22425e;
}

.badge--ok {
  background: var(--success-bg);
  color: var(--success);
}

.badge--warn {
  background: var(--warn-bg);
  color: var(--warn);
}

.message {
  margin: 0;
  border-radius: 12px;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--info-border);
  background: var(--info-bg);
  color: var(--info);
  line-height: 1.55;
}

.intro-panel > .message {
  margin-top: 1rem;
}

.message--success {
  border-color: var(--success-border);
  background: var(--success-bg);
  color: var(--success);
}

.message--warning {
  border-color: var(--warn-border);
  background: var(--warn-bg);
  color: var(--warn);
}

.message--error {
  border-color: var(--danger-border);
  background: var(--danger-bg);
  color: var(--danger);
}

.preset-strip {
  margin-top: 1rem;
}

.preset-grid {
  display: grid;
  gap: 0.75rem;
}

@media (min-width: 720px) {
  .preset-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.preset-chip {
  width: 100%;
  display: grid;
  gap: 0.3rem;
  justify-items: start;
  padding: 0.95rem 1rem;
  text-align: left;
  background: #ffffff;
  color: #17314c;
  border: 1px solid #c9d8e8;
}

.preset-chip span {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.preset-chip.is-active,
.preset-chip:hover:not(:disabled) {
  background: #eff5ff;
  border-color: #99bced;
}

.drop-zone {
  display: grid;
  gap: 0.45rem;
  justify-items: center;
  text-align: center;
  margin-top: 1rem;
  padding: 1.4rem 1rem;
  border: 2px dashed #9cb9dc;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(248, 251, 255, 0.95), rgba(237, 244, 252, 0.92));
  cursor: pointer;
}

.drop-zone.is-over {
  border-color: var(--primary);
  background: #edf5ff;
}

.queue-panel > .toolbar-row {
  margin-top: 1rem;
}

.field {
  display: grid;
  gap: 0.45rem;
}

.field strong {
  font-weight: 700;
}

.field--inline {
  flex: 1 1 280px;
}

.field--range {
  gap: 0.6rem;
}

.form-grid {
  display: grid;
  gap: 0.85rem;
}

.checkbox-row {
  display: flex;
  gap: 0.7rem;
  align-items: center;
}

.queue-list {
  display: grid;
  gap: 0.85rem;
  margin-top: 1rem;
}

.queue-empty {
  padding: 1rem;
  border: 1px dashed #c3d2e3;
  border-radius: 14px;
  background: var(--surface-soft);
  color: var(--muted);
}

.queue-item {
  display: grid;
  gap: 0.55rem;
  padding: 0.95rem 1rem;
  border: 1px solid #d1dce8;
  border-radius: 14px;
  background: #ffffff;
}

.queue-item.is-selected {
  border-color: #93b9ea;
  background: #f7fbff;
}

.queue-item__head,
.queue-item__actions,
.progress-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: center;
}

.queue-select {
  padding: 0;
  border: 0;
  background: none;
  color: #17314c;
  text-align: left;
  justify-content: start;
}

.queue-select:hover:not(:disabled) {
  background: none;
  color: var(--primary-dark);
}

.queue-item__meta,
.queue-item__error {
  margin: 0;
  font-size: 0.95rem;
}

.queue-item__error {
  color: var(--danger);
}

.status-pill--pending {
  background: #eef2f6;
  color: #526476;
}

.status-pill--processing {
  background: var(--info-bg);
  color: var(--info);
}

.status-pill--success {
  background: var(--success-bg);
  color: var(--success);
}

.status-pill--failed {
  background: var(--danger-bg);
  color: var(--danger);
}

.controls-panel {
  display: grid;
  gap: 1rem;
}

.control-group {
  display: grid;
  gap: 0.9rem;
  padding: 0 0 1rem;
  border-bottom: 1px solid #e1e9f1;
}

.control-group__content {
  display: grid;
  gap: 0.9rem;
}

.control-group:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.export-summary {
  margin: 0;
  padding: 0.85rem 0.95rem;
  border-radius: 12px;
  background: var(--surface-soft);
  color: #22384f;
}

.issue-list,
.guide-card ul {
  margin: 0;
  padding-left: 1.15rem;
  display: grid;
  gap: 0.45rem;
}

.issue {
  line-height: 1.5;
}

.issue--error {
  color: var(--danger);
}

.issue--warning {
  color: var(--warn);
}

.issue--info {
  color: var(--info);
}

.button-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

@media (max-width: 639px) {
  .button-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.progress-block {
  display: grid;
  gap: 0.7rem;
}

.preview-panel {
  display: grid;
  gap: 1rem;
}

.preview-grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 760px) {
  .preview-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.preview-card {
  display: grid;
  gap: 0.6rem;
}

.preview-label {
  margin: 0;
  font-weight: 700;
}

.preview-pane {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 260px;
  overflow: hidden;
  border: 1px solid #d2dce8;
  border-radius: 16px;
  background:
    linear-gradient(45deg, rgba(221, 229, 239, 0.9) 25%, transparent 25%) 0 0 / 18px 18px,
    linear-gradient(-45deg, rgba(221, 229, 239, 0.9) 25%, transparent 25%) 0 0 / 18px 18px,
    linear-gradient(45deg, transparent 75%, rgba(221, 229, 239, 0.9) 75%) 0 0 / 18px 18px,
    linear-gradient(-45deg, transparent 75%, rgba(221, 229, 239, 0.9) 75%) 0 0 / 18px 18px,
    #f8fbff;
}

.preview-pane img {
  max-width: 100%;
  max-height: 360px;
  display: block;
}

.preview-pane.is-circle-mask img {
  border-radius: 999px;
}

.preview-empty {
  position: absolute;
  inset: auto 1rem 1rem;
  margin: 0;
  padding: 0.75rem 0.85rem;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.95);
  color: #26415d;
}

.guide-layout {
  display: grid;
  gap: 1rem;
  padding-bottom: 1.5rem;
}

@media (min-width: 760px) {
  .guide-layout {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.guide-card {
  display: grid;
  gap: 0.8rem;
  padding: 1rem;
}

.guide-card--faq {
  align-content: start;
}

.faq-stack {
  display: grid;
  gap: 0.7rem;
}

.faq-stack details {
  border: 1px solid #d2dce8;
  border-radius: 12px;
  padding: 0.85rem 0.95rem;
  background: #fbfdff;
}

.faq-stack summary {
  cursor: pointer;
  font-weight: 700;
}

.faq-stack p {
  margin: 0.75rem 0 0;
  color: var(--muted);
  line-height: 1.55;
}

.updated-at {
  margin: 0;
  color: var(--muted);
}

.tool-footer {
  padding-bottom: 2rem;
}

.tool-footer__inner {
  display: grid;
  gap: 0.85rem;
}

.tool-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.tool-footer__meta,
.tool-footer__note {
  line-height: 1.6;
}

@media (max-width: 639px) {
  .panel,
  .guide-card {
    padding: 0.9rem;
  }

  .share-row {
    display: grid;
    width: 100%;
  }

  .toolbar-row {
    display: grid;
  }
}