*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --black: #000000;
  --card: #111111;
  --border: #222222;
  --input-bg: #0a0a0a;
  --input-border: #333333;
  --white: #FFFFFF;
  --dim: #cccccc;
  --accent: #FF6B2B;
  --red: #FF3B3B;
  --green: #4ADE80;
  --yellow: #FBBF24;
  --amber: #FBBF24;
  --font-heading: 'Bebas Neue', sans-serif;
  --font-mono: 'DM Mono', monospace;
  --font-body: system-ui, -apple-system, sans-serif;
}

html {
  background: var(--black);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 20px;
  line-height: 1.2;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  padding-bottom: 72px;
}

/* ---- HEADER ---- */

.site-header {
  padding: 48px 32px 32px;
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.logo {
  font-family: var(--font-heading);
  font-size: 70px;
  letter-spacing: 2px;
  line-height: 0.65;
  font-weight: 400;
}

.logo-accent {
  color: var(--accent);
}

.subtitle {
  margin-top: 2px;
  color: var(--dim);
  font-size: 20px;
}

/* ---- LAYOUT ---- */

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 0px 0px;
}

.section {
  margin-top: 40px;
}

.section:first-child {
  margin-top: 2px;
}

.section-label {
  font-family: var(--font-heading);
  font-size: 22px;
  letter-spacing: 1px;
  color: var(--accent);
  opacity: 1;
  margin-bottom: 20px;
  font-weight: 400;
  text-align: center;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-label::before,
.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--accent);
  opacity: 0.4;
}

.section-label-sub {
  font-size: 20px;
  letter-spacing: 1px;
  color: #888;
  margin-left: 8px;
}

/* ---- TABS ---- */

.tabs {
  display: flex;
  gap: 0;
  opacity: 0.8;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border);
}

.tab {
  flex: 1;
  font-family: var(--font-heading);
  font-size: 30px;
  letter-spacing: 2px;
  padding: 0px 20px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--dim);
  cursor: pointer;
  transition: all 0.15s;
  text-align: center;
}

.tab:hover {
  color: var(--white);
}

.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---- GRIDS ---- */

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

/* ---- FORM FIELDS ---- */

.field label {
  display: block;
  font-family: var(--font-heading);
  font-size: 28px;
  letter-spacing: 2px;
  color: var(--dim);
  margin-bottom: 6px;
  text-transform: uppercase;
}

.req {
  color: var(--accent);
}

.opt {
  color: var(--amber);
  font-size: 20px;
}

.field input[type="text"],
.field input[type="number"],
.field select,
.field textarea {
  width: 100%;
  padding: 10px 12px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 4px;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
  -webkit-appearance: none;
  appearance: none;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--accent);
}

.field select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='none'%3E%3Cpath d='M1 1.5l5 5 5-5' stroke='%23666' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

.input-with-suffix {
  display: flex;
  align-items: center;
}

.input-with-suffix input {
  flex: 1;
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}

.input-suffix {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--dim);
  background: var(--card);
  border: 1px solid var(--input-border);
  border-left: none;
  border-radius: 0 4px 4px 0;
  padding: 10px 12px;
  line-height: 1.2;
}

.hint {
  font-size: 14px;
  color: var(--dim);
  margin-top: 0px;
}

.hint-block {
  line-height: 1;
  margin-bottom: 20px;
  text-align: center;
}

.divider {
  height: 1px;
  background: var(--border);
  margin: 20px 0;
}

/* ---- FORMAT PREVIEW ---- */

.format-preview {
  padding: 0px 0;
  font-family: var(--font-body);
  font-size: 18px;
  color: var(--dim);
  margin-bottom: 8px;
  line-height: 1.4;
  text-align: center;
}

.seg {
  display: inline-block;
  padding: 0px 12px;
  font-size: 18px;
  font-weight: 500;
  border-radius: 4px;
}

.seg-required {
  background: rgba(255, 107, 43, 0.12);
  color: var(--accent);
  border: 1px solid rgba(255, 107, 43, 0.25);
}

.seg-optional {
  background: rgba(251, 191, 36, 0.12);
  color: var(--amber);
  border: 1px solid rgba(251, 191, 36, 0.25);
}

.seg-sep {
  color: #888;
  font-size: 18px;
}

.format-example {
  font-family: var(--font-body);
  font-size: 20px;
  text-align: center;
  margin-top: 8px;
}

.seg-required-text {
  color: var(--accent);
}

.seg-optional-text {
  color: var(--amber);
}

.format-legend {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.hint-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 4px;
  vertical-align: middle;
}

.hint-dot-required {
  background: var(--accent);
}

.hint-dot-optional {
  background: var(--amber);
}

/* ---- TAGS / DESCRIPTORS ---- */

.tags-area {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 16px;
}

.selected-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-height: 36px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}

.empty-hint {
  font-family: var(--font-body);
  font-size: 18px;
  color: var(--dim);
  line-height: 20px;
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  max-height: 200px;
  overflow-y: auto;
}

.chip-group::-webkit-scrollbar {
  width: 4px;
}

.chip-group::-webkit-scrollbar-thumb {
  background: var(--border);
}

.chip-group-label {
  width: 100%;
  font-family: var(--font-heading);
  font-size: 18px;
  letter-spacing: 2px;
  color: #888;
  margin-top: 8px;
  margin-bottom: 2px;
  text-transform: uppercase;
}

.chip-group-label:first-child {
  margin-top: 0;
}

.chip {
  font-family: var(--font-body);
  font-size: 16px;
  padding: 4px 10px;
  border: 1px solid var(--input-border);
  border-radius: 4px;
  background: transparent;
  color: var(--dim);
  cursor: pointer;
  transition: all 0.12s;
  user-select: none;
}

.chip:hover {
  border-color: var(--accent);
  color: var(--white);
}

.chip.selected {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--black);
}

.selected-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-body);
  font-size: 16px;
  padding: 4px 10px;
  border-radius: 4px;
  background: rgba(255, 107, 43, 0.1);
  border: 1px solid var(--accent);
  color: var(--accent);
}

.remove-tag {
  cursor: pointer;
  opacity: 0.6;
  font-size: 16px;
  line-height: 1;
}

.remove-tag:hover {
  opacity: 1;
}

/* ---- BUILDER OUTPUT ---- */

.builder-output-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 16px 20px;
  position: relative;
}

.builder-output-label {
  font-family: var(--font-heading);
  font-size: 18px;
  letter-spacing: 1px;
  color: var(--dim);
  margin-bottom: 10px;
  text-transform: uppercase;
}

.builder-output-filename {
  font-family: var(--font-body);
  font-size: 18px;
  color: var(--accent);
  word-break: break-all;
  line-height: 1.6;
  min-height: 24px;
  padding-right: 80px;
}

.builder-output-filename.empty {
  color: var(--dim);
}

.builder-output-box .btn-copy {
  position: absolute;
  top: 16px;
  right: 16px;
}

/* ---- VALIDATION LIST ---- */

.validation-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 12px;
}

.validation-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 14px;
  padding: 6px 8px;
  border-radius: 4px;
}

.validation-item.ok {
  background: rgba(74, 222, 128, 0.05);
  color: var(--green);
}

.validation-item.err {
  background: rgba(255, 59, 59, 0.05);
  color: var(--red);
}

.validation-item.warn {
  background: rgba(251, 191, 36, 0.05);
  color: var(--amber);
}

.validation-item .icon {
  font-size: 16px;
  flex-shrink: 0;
}

/* ---- BUTTONS ---- */

.btn {
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 2px;
  padding: 10px 20px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: opacity 0.15s;
  text-transform: uppercase;
}

.btn:hover {
  opacity: 0.85;
}

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

.btn-ghost {
  background: transparent;
  color: var(--white);
  border: 1px solid var(--input-border);
}

.btn-ghost:hover {
  border-color: var(--white);
}

.btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 20px;
  justify-content: center;
}

.btn-row .btn {
  font-size: 20px;
  padding: 12px 28px;
}

/* ---- COPY BUTTON ---- */

.btn-copy {
  font-family: var(--font-heading);
  font-size: 20px;
  letter-spacing: 2px;
  padding: 6px 14px;
  background: transparent;
  border: 1px solid var(--input-border);
  border-radius: 4px;
  color: var(--white);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
}

.btn-copy:hover:not(:disabled) {
  border-color: var(--white);
}

.btn-copy:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

.btn-copy.copied {
  color: var(--accent);
  border-color: var(--accent);
}

/* ---- DROP ZONE ---- */

.drop-zone {
  border: 2px dashed var(--input-border);
  border-radius: 4px;
  padding: 56px 32px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(255, 107, 43, 0.04);
}

.drop-icon {
  font-size: 32px;
  color: var(--dim);
  margin-bottom: 12px;
  font-family: var(--font-heading);
}

.drop-text {
  font-size: 16px;
  color: var(--white);
}

.drop-sub {
  margin-top: 6px;
  font-size: 13px;
  color: var(--dim);
}

.browse-link {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 13px;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.browse-link:hover {
  color: var(--white);
}

/* ---- FILE ROW (file drop mode) ---- */

.files-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.files-header .section-label {
  margin-bottom: 0;
}

.file-row {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 20px 24px;
  margin-bottom: 8px;
}

.file-row-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.file-row-original {
  font-family: var(--font-body);
  font-size: 18px;
  color: var(--dim);
  margin-bottom: 14px;
  word-break: break-all;
}

.btn-remove {
  background: none;
  border: none;
  color: var(--dim);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  padding: 0 0 0 12px;
  transition: color 0.15s;
}

.btn-remove:hover {
  color: var(--red);
}

.file-row-fields {
  display: grid;
  grid-template-columns: 160px 130px 80px 130px 1fr;
  gap: 12px;
  align-items: start;
}

.file-row-fields .field {
  min-width: 0;
}

.file-row-fields input[type="number"] {
  -moz-appearance: textfield;
}

.file-row-fields input[type="number"]::-webkit-inner-spin-button,
.file-row-fields input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

.descriptors-area {
  margin-top: 14px;
}

.descriptors-area .field label {
  margin-bottom: 8px;
}

/* ---- FILE ROW OUTPUT ---- */

.file-row-output {
  margin-top: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--black);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.file-row-output.has-duplicate {
  border-color: var(--amber);
  background: rgba(251, 191, 36, 0.05);
}

.file-row-output .output-filename {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  word-break: break-all;
  min-width: 0;
}

.duplicate-tag {
  font-family: var(--font-heading);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--amber);
  white-space: nowrap;
  display: none;
}

.has-duplicate .duplicate-tag {
  display: inline;
}

.validation-msg {
  margin-top: 6px;
  font-size: 12px;
  color: var(--red);
  min-height: 18px;
}

.validation-msg:empty {
  display: none;
}

.warning-msg {
  margin-top: 4px;
  font-size: 12px;
  color: var(--amber);
}

.warning-msg:empty {
  display: none;
}

/* ---- BULK RENAMER ---- */

.bulk-input {
  width: 100%;
  min-height: 120px;
  padding: 14px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 4px;
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  resize: vertical;
  outline: none;
}

.bulk-input:focus {
  border-color: var(--accent);
}

.bulk-results {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 16px;
}

.bulk-row {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: 14px;
  padding: 10px 12px;
}

.bulk-row-top {
  display: grid;
  grid-template-columns: 1fr 20px 1fr auto auto;
  gap: 8px;
  align-items: center;
}

.bulk-row .original {
  color: var(--dim);
  word-break: break-all;
}

.bulk-row .arrow {
  color: var(--dim);
  text-align: center;
}

.bulk-row .renamed {
  color: var(--accent);
  word-break: break-all;
}

.bulk-row.has-error {
  border-color: var(--red);
}

.bulk-row .renamed.error {
  color: var(--red);
}

.bulk-warnings {
  grid-column: 1 / -1;
  padding-top: 6px;
}

.bulk-warning {
  display: inline-block;
  font-size: 11px;
  color: var(--yellow);
  margin-right: 12px;
  font-family: var(--font-mono);
}

.bulk-expand-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--dim);
  border-radius: 3px;
  cursor: pointer;
  padding: 4px 8px;
  font-size: 10px;
  transition: color 0.15s, border-color 0.15s;
}
.bulk-expand-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.bulk-editor {
  padding-top: 10px;
  border-top: 1px solid var(--border);
  margin-top: 10px;
}

.bulk-editor-fields {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 12px;
}

.bulk-editor-descriptors label {
  display: block;
  font-size: 10px;
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--dim);
  margin-bottom: 6px;
}

.bulk-copy-btn {
  padding: 4px 12px;
  font-size: 10px;
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.05em;
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 3px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}
.bulk-copy-btn:hover {
  background: var(--accent);
  color: var(--bg);
}
.bulk-copy-btn.copied {
  background: var(--green);
  border-color: var(--green);
  color: var(--bg);
}

.bulk-row.has-warnings:not(.has-error) {
  border-color: var(--yellow);
}

/* ---- COMPLIANCE BAR ---- */

.compliance-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 14px 32px;
  z-index: 100;
}

.compliance-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  gap: 32px;
  align-items: center;
}

.compliance-item {
  font-family: var(--font-heading);
  font-size: 14px;
  letter-spacing: 1px;
}

.compliance-item.ready {
  color: var(--green);
}

.compliance-item.errors {
  color: var(--red);
}

.compliance-item.duplicates {
  color: var(--amber);
}

.compliance-item.hidden {
  display: none;
}

/* ---- RESPONSIVE ---- */

@media (max-width: 800px) {
  .site-header {
    padding: 32px 20px 24px;
  }

  main {
    padding: 0 20px 48px;
  }

  .logo {
    font-size: 28px;
  }

  .tabs {
    flex-wrap: wrap;
  }

  .tab {
    font-size: 12px;
    padding: 10px 14px;
  }

  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }

  .file-row {
    padding: 16px;
  }

  .file-row-fields {
    grid-template-columns: 1fr 1fr;
  }

  .compliance-bar {
    padding: 12px 20px;
  }

  .compliance-inner {
    gap: 16px;
    flex-wrap: wrap;
  }
}

@media (max-width: 500px) {
  .file-row-fields {
    grid-template-columns: 1fr;
  }
}