:root {
  --page-bg: #f9f9f9;
  --panel-bg: #ffffff;
  --panel-border: #d1d5db;
  --input-bg: #ffffff;
  --input-text: #1f2937;
  --input-border: #b8c7dc;
  --result-bg: #eef5ff;
  --result-row-bg: #ffffff;
  --table-header-bg: #dceaff;
  --text: #1f2937;
  --muted: #475569;
  --button-bg: #eeeeee;
  --button-hover-bg: #dddddd;
  --button-active-bg: #ffffff;
  --primary-bg: #60a5fa;
  --primary-hover-bg: #93c5fd;
  --error: #b91c1c;
  --ok: #166534;
  --warn: #92400e;
  --badge-bg: #eef2ff;
  --shadow: 0 8px 22px rgba(30, 64, 175, 0.08);
}

body.dark-mode {
  --page-bg: #333333;
  --panel-bg: #444444;
  --panel-border: #666666;
  --input-bg: #555555;
  --input-text: #eeeeee;
  --input-border: #666666;
  --result-bg: #3b3b3b;
  --result-row-bg: #3f3f3f;
  --table-header-bg: #4b4b4b;
  --text: #eeeeee;
  --muted: #c7c7c7;
  --button-bg: #555555;
  --button-hover-bg: #666666;
  --button-active-bg: #444444;
  --primary-bg: #60a5fa;
  --primary-hover-bg: #93c5fd;
  --error: #fca5a5;
  --ok: #86efac;
  --warn: #fbbf24;
  --badge-bg: #555555;
  --shadow: none;
}

* { box-sizing: border-box; }
body { font-family: Arial, sans-serif; margin: 20px; background: var(--page-bg); color: var(--text); transition: background-color 0.3s, color 0.3s; position: relative; }
.container { max-width: 900px; margin: auto; background: var(--panel-bg); border: 1px solid var(--panel-border); padding: 20px; border-radius: 8px; }
h1 { text-align: center; margin-top: 0; }
.tabs { display: flex; border-bottom: 1px solid var(--panel-border); margin-bottom: 15px; }
.tab-button, button { padding: 8px 12px; cursor: pointer; border: 1px solid var(--panel-border); background: var(--button-bg); color: var(--text); border-radius: 6px; }
.tab-button { padding: 10px 15px; border-radius: 0; border-left: 0; border-top: 0; border-bottom: 0; font-weight: bold; }
.tab-button:hover, button:hover:not(:disabled) { background: var(--button-hover-bg); }
.tab-button.active { background: var(--button-active-bg); box-shadow: inset 0 -3px 0 var(--primary-bg); cursor: default; }
button:disabled { cursor: not-allowed; opacity: 0.55; }
.tab-content { display: none; }
.tab-content.active { display: block; }
.form-group { margin-bottom: 10px; }
label { display: block; margin-bottom: 5px; font-weight: bold; }
input[type="text"], select, textarea { width: 100%; padding: 8px; border: 1px solid var(--input-border); border-radius: 6px; background: var(--input-bg); color: var(--input-text); }
.input-group { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 6px; align-items: stretch; }
.group-buttons, .step-buttons { display: flex; gap: 4px; align-items: stretch; }
.step-buttons { display: grid; grid-template-columns: repeat(4, auto); }
.step-button { min-width: 42px; padding: 5px 8px; white-space: nowrap; font-size: 0.9em; }
.primary { background: var(--primary-bg); border-color: var(--primary-bg); color: #111827; }
.primary:hover { background: var(--primary-hover-bg); }
.error { color: var(--error); font-size: 0.9em; white-space: pre-wrap; }
.muted { color: var(--muted); font-size: 0.95em; }
.results, .result-card { margin-top: 15px; padding: 14px; border: 1px solid var(--panel-border); background: var(--result-bg); color: var(--text); border-radius: 8px; box-shadow: var(--shadow); }
.result-item { margin: 8px 0; }
table, .data-table { width: 100%; border-collapse: collapse; margin-top: 10px; color: var(--text); }
th { background: var(--table-header-bg); }
table th, table td { text-align: left; border-bottom: 1px solid var(--panel-border); padding: 8px; }
tbody tr:nth-child(even) { background: var(--result-row-bg); }
details { margin: 12px 0; border: 1px solid var(--panel-border); border-radius: 8px; padding: 8px 10px; background: color-mix(in srgb, var(--result-bg) 85%, var(--panel-bg)); }
summary { cursor: pointer; font-weight: bold; }
#toggleDarkModeBtn { position: absolute; top: 10px; right: 10px; padding: 4px 8px; font-size: 0.9em; }
.mac-input-row { display: flex; gap: 8px; align-items: stretch; }
.mac-input-row input[type="text"] { min-width: 0; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.result-grid { display: grid; grid-template-columns: minmax(150px, 0.6fr) minmax(0, 1.4fr); gap: 8px 14px; align-items: center; }
.key { color: var(--muted); font-weight: bold; }
.value, .format-value { color: var(--text); overflow-wrap: anywhere; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.vendor-name { font-family: Arial, sans-serif; font-weight: bold; }
.badge-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.badge { display: inline-flex; align-items: center; gap: 4px; padding: 4px 8px; border-radius: 999px; background: var(--badge-bg); border: 1px solid var(--panel-border); color: var(--text); font-size: 0.9em; }
.badge.ok { border-color: var(--ok); color: var(--ok); }
.badge.warn { border-color: var(--warn); color: var(--warn); }
.formats { margin-top: 16px; display: grid; gap: 8px; }
.format-label { font-weight: bold; color: var(--muted); font-size: 0.92em; }
.copy-button { white-space: nowrap; }
.small { font-size: 0.9em; }
.examples { display: flex; align-items: center; flex-wrap: nowrap; gap: 6px; margin-top: 12px; white-space: nowrap; overflow-x: auto; }
.examples button { flex: 0 0 auto; padding: 5px 7px; font-size: 0.86rem; }
.examples-label { flex: 0 0 auto; }
.export-panel { margin-top: 14px; padding: 12px; border: 1px solid var(--panel-border); border-radius: 8px; background: color-mix(in srgb, var(--panel-bg) 70%, var(--result-bg)); }
.export-fields { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; align-items: end; }
.export-actions { display: flex; gap: 8px; margin-top: 10px; }
.export-output { width: 100%; min-height: 3.5rem; height: auto; max-height: none; margin-top: 8px; overflow: hidden; resize: none; field-sizing: content; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.cidr-input-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.cidr-input-grid textarea { min-height: 120px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.status-summary, .cidr-status { margin: 12px 0; padding: 10px; border: 1px solid var(--panel-border); border-radius: 8px; background: var(--result-row-bg); }
.app-version { position: fixed; right: 8px; bottom: 6px; z-index: 20; padding: 3px 7px; border: 1px solid var(--panel-border); border-radius: 5px; background: var(--panel-bg); color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 11px; line-height: 1.2; opacity: 0.8; user-select: text; }

@media (max-width: 915px) {
  .examples-label,
  .examples .example { display: none; }
  .examples { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 8px; overflow: visible; white-space: normal; }
  .examples .random-mac-action { width: 100%; }
}
@media (max-width: 590px) {
  h1 { padding-inline: 80px; line-height: 1.15; }
  #toggleDarkModeBtn { top: 6px; right: 6px; padding: 4px 7px; font-size: 0.8rem; opacity: 0.62; background: color-mix(in srgb, var(--panel-bg) 72%, transparent); backdrop-filter: blur(4px); }
  #toggleDarkModeBtn:hover,
  #toggleDarkModeBtn:focus-visible { opacity: 1; }
}
@media (max-width: 640px) { body { margin: 10px; } .tabs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; overflow: visible; border-bottom: 0; } .tab-button { width: 100%; min-width: 0; white-space: normal; overflow-wrap: anywhere; border: 1px solid var(--panel-border); border-radius: 4px; text-align: center; padding: 8px 6px; font-size: 0.92rem; } .tab-button:last-child { grid-column: 1 / -1; } .input-group, .mac-input-row, .result-grid, .cidr-input-grid, .export-fields { grid-template-columns: 1fr; display: grid; } .step-buttons { grid-template-columns: repeat(4, minmax(0, 1fr)); } .copy-button, .step-button { width: 100%; } .app-version { left: 8px; right: auto; } }
.range-input-group { grid-template-columns: minmax(0, 1fr) auto; }
.range-status { display: none; margin-bottom: 10px; padding: 8px 10px; border: 1px solid var(--panel-border); border-radius: 6px; }
.range-status.is-error { display: block; color: var(--error); border-color: var(--error); background: color-mix(in srgb, var(--error) 8%, var(--result-bg)); }
.matched-prefix-line { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; min-width: 0; }
.formats-table-card { padding: 8px; }
.formats-table { width: 100%; table-layout: fixed; }
.formats-table th,
.formats-table td { padding-top: 6px; padding-bottom: 6px; }
.formats-table th:first-child,
.formats-table td:first-child { width: 170px; white-space: nowrap; }
.formats-table th:last-child,
.formats-table td:last-child { width: 58px; text-align: right; }
.formats-table .format-copy-cell { width: 58px; text-align: right; }
.formats-table .copy-button { width: auto; padding: 5px 7px; font-size: 0.86rem; line-height: 1.2; }
@media (max-width: 640px) {
  .formats-table thead,
  .formats-table th:first-child,
  .formats-table td:first-child { display: none; }
  .formats-table { width: 100%; table-layout: auto; }
  .formats-table td:nth-child(2) { width: auto; white-space: nowrap; overflow-x: auto; }
  .formats-table td:last-child { width: 58px; text-align: right; }
  .formats-table .copy-button { width: 52px; }
}

@media (max-width: 640px) {
  .cidr-table { width: 100%; max-width: 100%; table-layout: fixed; font-size: 0.82rem; }
  .cidr-table th:nth-child(2),
  .cidr-table td:nth-child(2),
  .cidr-table th:nth-child(3),
  .cidr-table td:nth-child(3) { display: none; }
  .cidr-table th,
  .cidr-table td { min-width: 0; padding: 6px 4px; overflow-wrap: anywhere; word-break: break-word; }
  .cidr-table th:nth-child(1),
  .cidr-table td:nth-child(1) { width: 42%; }
  .cidr-table th:nth-child(4),
  .cidr-table td:nth-child(4) { width: 36%; }
  .cidr-table th:nth-child(5),
  .cidr-table td:nth-child(5) { width: 22%; text-align: right; }
}

.clearable-field { position: relative; display: block; min-width: 0; }
.clearable-field > input, .clearable-field > textarea { width: 100%; padding-right: 3rem; }
.clearable-field > textarea { padding-right: 4rem; }
.field-clear-button { position: absolute; right: 6px; top: 50%; transform: translateY(-50%); min-width: 2rem; height: 1.75rem; padding: 0 0.45rem; line-height: 1; border-radius: 999px; background: var(--button-bg); color: var(--text); border: 1px solid var(--panel-border); }
.field-clear-button:hover:not(:disabled), .field-clear-button:focus-visible { background: var(--button-hover-bg); outline: 2px solid var(--primary-bg); outline-offset: 1px; }
.field-clear-button[hidden] { display: none; }
.clearable-field > textarea + .field-clear-button { top: 10px; right: 22px; transform: none; }
.input-group > .clearable-field { min-width: 0; }
.mac-input-row > .clearable-field { flex: 1 1 auto; width: 100%; min-width: 0; }