:root {
  --bg: #0d1016;
  --bg-deep: #07090d;
  --surface: rgba(17, 21, 28, 0.9);
  --surface-soft: rgba(20, 26, 35, 0.78);
  --surface-strong: rgba(24, 30, 40, 0.96);
  --panel-glow: rgba(255, 178, 108, 0.08);
  --line: rgba(255, 255, 255, 0.1);
  --line-strong: rgba(255, 210, 173, 0.3);
  --text: #f3f5f8;
  --text-soft: #c4ceda;
  --text-muted: #93a1b3;
  --accent: #f4b57b;
  --accent-strong: #ff9a42;
  --accent-soft: rgba(255, 154, 66, 0.14);
  --blue: #91c2ff;
  --blue-soft: rgba(145, 194, 255, 0.14);
  --danger: #ff8f8f;
  --danger-soft: rgba(255, 111, 111, 0.14);
  --success: #9de6b1;
  --success-soft: rgba(104, 201, 142, 0.14);
  --shadow: 0 26px 60px rgba(0, 0, 0, 0.38);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 18px;
  --radius-sm: 14px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  --font-heading: "Sora", "IBM Plex Sans", sans-serif;
  background:
    radial-gradient(circle at 12% 0%, rgba(255, 154, 66, 0.22), transparent 22%),
    radial-gradient(circle at 88% 12%, rgba(145, 194, 255, 0.12), transparent 22%),
    radial-gradient(circle at 48% 100%, rgba(255, 176, 104, 0.08), transparent 26%),
    linear-gradient(180deg, #2a190f 0%, #17110d 18%, #0d1016 46%, #07090d 100%);
  color: var(--text);
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  line-height: 1.5;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
label {
  cursor: pointer;
}

a {
  color: inherit;
}

code,
pre {
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
}

.page_shell {
  width: min(1380px, calc(100% - 28px));
  margin: 0 auto;
  padding: 92px 0 36px;
}

.hero,
.panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at top right, var(--panel-glow), transparent 32%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0)),
    var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.hero::before,
.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), transparent 22%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.02) 0 1px, transparent 1px 72px);
}

.hero > *,
.panel > * {
  position: relative;
  z-index: 1;
}

.hero {
  display: grid;
  gap: 24px;
  padding: 28px clamp(18px, 3vw, 34px);
}

.hero_copy {
  display: grid;
  gap: 12px;
}

.hero_badge,
.step_badge,
.library_group_kicker,
.start_intro strong {
  margin: 0;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero_badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 0.42rem 0.72rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 182, 132, 0.22);
  background: rgba(255, 154, 66, 0.08);
  color: #ffd0a7;
}

.hero h1 {
  margin: 0;
  max-width: 16ch;
  font-family: "Sora", sans-serif;
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 0.98;
  letter-spacing: -0.05em;
}

.hero_text {
  margin: 0;
  max-width: 64ch;
  color: var(--text-soft);
  font-size: clamp(1rem, 1vw + 0.84rem, 1.08rem);
}

.flow_track {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.flow_step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.04);
}

.flow_step_number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(180deg, #ffbd86, #e38a3f);
  color: #25160d;
  font-family: "Sora", sans-serif;
  font-weight: 800;
}

.flow_step strong {
  display: block;
  font-family: "Sora", sans-serif;
  font-size: 1rem;
}

.flow_step p {
  margin: 6px 0 0;
  color: var(--text-soft);
  font-size: 0.93rem;
}

.app_shell {
  margin-top: 18px;
}

.builder_layout {
  display: grid;
  grid-template-columns: minmax(300px, 0.85fr) minmax(0, 1.4fr);
  gap: 18px;
  align-items: start;
}

.start_column {
  position: sticky;
  top: 86px;
}

.main_column {
  display: grid;
  gap: 18px;
}

.panel {
  padding-bottom: 22px;
}

.step_header,
.subpanel_head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}

.step_header {
  padding: 22px 22px 14px;
}

.step_badge {
  color: var(--blue);
}

.step_header h2 {
  margin: 8px 0 0;
  font-family: "Sora", sans-serif;
  font-size: 1.38rem;
  line-height: 1.12;
}

.panel_hint {
  max-width: 32ch;
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  text-align: right;
}

.panel_body {
  display: grid;
  gap: 16px;
  padding: 0 22px;
}

.start_intro {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.04);
}

.start_intro strong {
  color: #ffe0c3;
}

.start_intro p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.92rem;
}

.start_intro_secondary strong {
  color: #d7e6ff;
}

.preset_grid {
  display: grid;
  gap: 10px;
}

.preset_card {
  display: grid;
  gap: 8px;
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0)),
    var(--surface-soft);
  color: inherit;
  text-align: left;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease, box-shadow 140ms ease;
}

.preset_card:hover,
.preset_card:focus-visible,
.preset_card.is-active {
  transform: translateY(-1px);
  border-color: rgba(255, 182, 132, 0.34);
  background:
    linear-gradient(180deg, rgba(255, 154, 66, 0.12), rgba(255, 255, 255, 0)),
    var(--surface-strong);
  box-shadow: 0 16px 26px rgba(0, 0, 0, 0.24);
}

.preset_name {
  margin: 0;
  font-family: "Sora", sans-serif;
  font-size: 0.98rem;
}

.preset_text {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.9rem;
}

.preset_regex,
.block_regex_preview,
.regex_output,
.secondary_output,
.match_value,
.group_value {
  margin: 0;
  padding: 12px 13px;
  border: 1px solid rgba(145, 194, 255, 0.12);
  border-radius: 16px;
  background: rgba(4, 8, 14, 0.92);
  color: #a7d0ff;
  font-size: 0.84rem;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
}

.library_groups {
  display: grid;
  gap: 12px;
}

.library_group {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.04);
  overflow: hidden;
}

.library_group > summary,
.library_group_head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
}

.library_group > summary {
  list-style: none;
  cursor: pointer;
}

.library_group > summary::-webkit-details-marker {
  display: none;
}

.library_group_title {
  margin: 0;
  font-family: "Sora", sans-serif;
  font-size: 0.98rem;
}

.library_group_hint {
  margin: 6px 0 0;
  color: var(--text-muted);
  font-size: 0.86rem;
}

.library_group_state {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid rgba(255, 182, 132, 0.18);
  border-radius: 999px;
  background: rgba(255, 154, 66, 0.08);
  color: #ffd3a9;
  font-size: 0.8rem;
}

.library_group_grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  padding: 0 16px 16px;
}

.library_item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  width: 100%;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
  color: inherit;
  text-align: left;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.library_item:hover,
.library_item:focus-visible {
  transform: translateY(-1px);
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.08);
}

.library_item_meta {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.library_item_name {
  font-size: 0.95rem;
}

.library_item_text {
  color: var(--text-muted);
  font-size: 0.84rem;
  line-height: 1.4;
}

.library_item_side {
  display: grid;
  gap: 10px;
  justify-items: end;
}

.library_item_preview {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 9px;
  border-radius: 999px;
  border: 1px solid rgba(145, 194, 255, 0.14);
  background: rgba(4, 8, 14, 0.9);
  color: #a7d0ff;
  font-size: 0.78rem;
}

.library_item_add {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 154, 66, 0.12);
  color: #ffd0a7;
  font-weight: 700;
}

.builder_toolbar {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.builder_toolbar_primary,
.secondary_tools_body,
.output_actions,
.example_chips,
.flags_row,
.builder_node_actions,
.block_actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tool_btn,
.inline_add_btn,
.alt_add_btn,
.block_action_btn,
.tool_btn_label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  text-decoration: none;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.tool_btn:hover,
.tool_btn:focus-visible,
.inline_add_btn:hover,
.inline_add_btn:focus-visible,
.alt_add_btn:hover,
.alt_add_btn:focus-visible,
.block_action_btn:hover,
.block_action_btn:focus-visible,
.tool_btn_label:hover,
.tool_btn_label:focus-visible {
  transform: translateY(-1px);
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.1);
}

.tool_btn_soft,
.tool_btn_label {
  color: var(--text-soft);
}

.tool_btn_danger {
  border-color: rgba(255, 111, 111, 0.22);
  color: #ffb1b1;
}

.tool_btn:disabled,
.block_action_btn:disabled,
.inline_add_btn:disabled,
.alt_add_btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.secondary_tools {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.04);
}

.secondary_tools > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 48px;
  padding: 0 16px;
  list-style: none;
  color: var(--text-soft);
  font-weight: 600;
  cursor: pointer;
}

.secondary_tools > summary::-webkit-details-marker {
  display: none;
}

.secondary_tools_body {
  padding: 0 16px 16px;
}

.message_stack {
  display: grid;
  gap: 10px;
}

.message_card {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-soft);
}

.message_card_info {
  border-color: rgba(145, 194, 255, 0.2);
  background: rgba(145, 194, 255, 0.1);
  color: #d7e8ff;
}

.message_card_error,
.block_message_error {
  border-color: rgba(255, 111, 111, 0.2);
  background: var(--danger-soft);
  color: #ffd3d3;
}

.message_card_warning,
.block_message_warning {
  border-color: rgba(255, 182, 132, 0.18);
  background: rgba(255, 154, 66, 0.1);
  color: #ffd9b7;
}

.builder_root,
.sequence_shell,
.block_options,
.quantifier_box,
.alt_list,
.group_wrap,
.match_list,
.group_list,
.block_message_list {
  display: grid;
  gap: 12px;
}

.builder_empty,
.nested_empty {
  padding: 18px;
  border: 1px dashed rgba(255, 210, 173, 0.24);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-soft);
}

.builder_empty h3,
.nested_empty h4 {
  margin: 0 0 6px;
  font-family: "Sora", sans-serif;
  font-size: 1rem;
}

.builder_empty p,
.nested_empty p {
  margin: 0;
}

.inline_add_form {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  padding: 14px;
  border: 1px dashed var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.03);
}

.inline_add_form select {
  flex: 1 1 220px;
}

.field_group {
  display: grid;
  gap: 8px;
}

.field_label {
  color: var(--text);
  font-weight: 700;
}

.field_hint {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.86rem;
}

input[type="text"],
input[type="number"],
select,
textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(4, 8, 14, 0.92);
  color: var(--text);
}

textarea {
  resize: vertical;
}

.block_card {
  display: grid;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0)),
    var(--surface-soft);
}

.block_card.is-structure {
  border-color: rgba(255, 182, 132, 0.18);
}

.block_card.is-advanced {
  border-color: rgba(145, 194, 255, 0.16);
}

.block_card.is-invalid {
  border-color: rgba(255, 111, 111, 0.24);
}

.block_card.nested {
  padding: 14px;
  border-radius: 20px;
}

.block_head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 14px;
}

.block_title_group {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.block_title {
  margin: 0;
  font-family: "Sora", sans-serif;
  font-size: 1rem;
}

.block_description {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.92rem;
}

.block_meta {
  display: grid;
  gap: 10px;
}

.block_tag_row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.block_tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-soft);
  font-size: 0.82rem;
}

.quantifier_box,
.group_wrap,
.alt_card,
.subpanel,
.expert_panel {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.04);
}

.quantifier_inputs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.group_headline,
.alt_head,
.output_head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
}

.group_caption {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.88rem;
}

.toggle_line,
.expert_toggle,
.flag_chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-soft);
}

.toggle_line input[type="checkbox"],
.expert_toggle input[type="checkbox"],
.flag_chip input[type="checkbox"] {
  width: 18px;
  height: 18px;
}

.alt_title,
.section_title {
  margin: 0;
  font-family: "Sora", sans-serif;
  font-size: 1rem;
}

.alt_remove_btn {
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid rgba(255, 111, 111, 0.22);
  border-radius: 999px;
  background: var(--danger-soft);
  color: #ffcbcb;
}

.or_divider {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.or_divider::before,
.or_divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: rgba(255, 255, 255, 0.08);
}

.test_body {
  gap: 14px;
}

.test_top_grid,
.results_grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.subpanel {
  display: grid;
  gap: 12px;
}

.subpanel_head {
  gap: 12px;
}

.regex_summary_card .stats_row,
.compact_stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.stat_card {
  display: grid;
  gap: 6px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(4, 8, 14, 0.72);
}

.stat_label {
  color: var(--text-muted);
  font-size: 0.82rem;
}

.stat_card strong {
  font-family: "Sora", sans-serif;
  font-size: 1.12rem;
}

.flag_chip {
  min-height: 40px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.04);
}

.flag_chip strong {
  font-family: "Sora", sans-serif;
  font-size: 0.92rem;
}

.secondary_output {
  color: var(--text-soft);
}

.highlight_preview {
  min-height: 146px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(4, 8, 14, 0.88);
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}

.highlight_preview mark {
  padding: 2px 5px;
  border-radius: 8px;
  background: rgba(255, 154, 66, 0.24);
  box-shadow: inset 0 0 0 1px rgba(255, 182, 132, 0.2);
}

.highlight_preview .empty_state {
  color: var(--text-muted);
}

.highlight_preview .empty_mark {
  padding: 2px 6px;
  border-radius: 8px;
  background: rgba(145, 194, 255, 0.18);
  box-shadow: inset 0 0 0 1px rgba(145, 194, 255, 0.16);
}

.explanation_list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 20px;
  color: var(--text-soft);
}

.match_panel {
  grid-column: 1 / -1;
}

.match_card {
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
}

.match_head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.match_head strong {
  font-family: "Sora", sans-serif;
  font-size: 0.96rem;
}

.match_meta {
  color: var(--text-muted);
  font-size: 0.84rem;
}

.group_item {
  display: grid;
  gap: 6px;
}

.group_label {
  color: var(--text-soft);
  font-size: 0.86rem;
}

.example_chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-soft);
}

.example_chip:hover,
.example_chip:focus-visible,
.example_chip.is-active {
  border-color: rgba(145, 194, 255, 0.32);
  background: rgba(145, 194, 255, 0.14);
  color: #d6e8ff;
}

.code_input {
  min-height: 118px;
}

[hidden] {
  display: none !important;
}

.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;
}

@media (max-width: 1180px) {
  .builder_layout {
    grid-template-columns: 1fr;
  }

  .start_column {
    position: static;
  }
}

@media (max-width: 960px) {
  .page_shell {
    width: min(100%, calc(100% - 18px));
    padding-top: 84px;
  }

  .flow_track,
  .test_top_grid,
  .results_grid {
    grid-template-columns: 1fr;
  }

  .library_group_grid {
    grid-template-columns: 1fr;
  }

  .step_header,
  .subpanel_head,
  .block_head,
  .group_headline,
  .alt_head,
  .match_head {
    flex-direction: column;
    align-items: start;
  }

  .panel_hint {
    text-align: left;
  }
}

@media (max-width: 720px) {
  .hero {
    padding: 20px 16px;
  }

  .panel_body,
  .step_header {
    padding-left: 16px;
    padding-right: 16px;
  }

  .panel_body {
    gap: 14px;
  }

  .builder_toolbar,
  .builder_toolbar_primary,
  .secondary_tools_body,
  .output_actions,
  .example_chips,
  .block_actions,
  .inline_add_form {
    flex-direction: column;
    align-items: stretch;
  }

  .tool_btn,
  .inline_add_btn,
  .alt_add_btn,
  .block_action_btn,
  .tool_btn_label {
    width: 100%;
  }

  .compact_stats,
  .quantifier_inputs {
    grid-template-columns: 1fr;
  }
}