:root {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color-scheme: dark;
  text-rendering: optimizeLegibility;
  font-synthesis: none;

  /* DevTools Dark Theme (Slate / Steel / Ice - Colors.xaml) */
  --bg: #0C1216;
  --card-bg: #141D23;
  --panel: #10181D;
  --panel2: #141D23;
  --border: #243038;
  --border-subtle: #1C2A32;
  --border-hover: #3D5562;
  --text: #E4EDF0;
  --text-primary: #E4EDF0;
  --text-secondary: #9AADB5;
  --muted: #6A848F;
  --accent: #8FA8B2;
  --accent-light: #B4C8CF;
  --accent-dark: #3D5058;
  --accent-glow: rgba(143, 168, 178, 0.25);

  --input-bg: #10181D;
  --input-border: #2C3B44;
  --btn-bg: #243540;
  --btn-hover: #2B3F4B;
  --btn-pressed: #334A57;
  --btn-border: #3D5562;
  --btn-text: #FFFFFF;

  --btn-sec-bg: #18232B;
  --btn-sec-hover: #1F2E38;
  --btn-sec-border: #2C3B44;

  --sidebar-bg: #10181D;
  --sidebar-border: #1C2A32;
  --nav-selected: #1A2830;
  --nav-hover: #141F26;
  --nav-accent: #8FA8B2;

  --editor-bg: #10181D;
  --editor-border: #243038;
  --mono: Consolas, "Cascadia Code", "Fira Code", monospace;
  --warning: #E8724A;
}

[data-theme="light"] {
  color-scheme: light;

  /* DevTools Light Theme (Slate / Steel / Ice - Colors.xaml) */
  --bg: #EFF3F4;
  --card-bg: #FFFFFF;
  --panel: #FFFFFF;
  --panel2: #E8EEF0;
  --border: #D0DADF;
  --border-subtle: #D8E0E4;
  --border-hover: #7A9099;
  --text: #152229;
  --text-primary: #152229;
  --text-secondary: #556870;
  --muted: #8A9FA8;
  --accent: #556870;
  --accent-light: #7A9099;
  --accent-dark: #3D5058;
  --accent-glow: rgba(85, 104, 112, 0.18);

  --input-bg: #FFFFFF;
  --input-border: #B8C6CC;
  --btn-bg: #556870;
  --btn-hover: #4A5C64;
  --btn-pressed: #3F5058;
  --btn-border: #3F5058;
  --btn-text: #FFFFFF;

  --btn-sec-bg: #E8EEF0;
  --btn-sec-hover: #D8E0E4;
  --btn-sec-border: #B8C6CC;

  --sidebar-bg: #D4DEE3;
  --sidebar-border: #B8C8CF;
  --nav-selected: #BFCED5;
  --nav-hover: #CAD6DC;
  --nav-accent: #556870;

  --editor-bg: #FFFFFF;
  --editor-border: #D0DADF;
  --warning: #C2512D;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 360px;
  background: var(--bg);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.5;
}

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

button, a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
  text-decoration: none;
}

.app-shell {
  min-height: 100vh;
}

/* --- SIDEBAR --- */
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: 254px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  padding: 20px 14px 16px;
  display: flex;
  flex-direction: column;
  z-index: 3;
}

.brand {
  height: 44px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 8px;
  font: 700 20px 'Segoe UI', sans-serif;
  letter-spacing: -0.5px;
}

.brand-mark {
  width: 34px !important;
  height: 34px !important;
  min-width: 34px !important;
  border-radius: 6px !important;
  background: transparent url("../app-icon-white.png") center / contain no-repeat !important;
  color: transparent !important;
  font-size: 0 !important;
  display: inline-block !important;
}

[data-theme="light"] .brand-mark {
  background-image: url("../app-icon-dark.png") !important;
}

.boot-mark {
  width: 54px !important;
  height: 54px !important;
  margin: 0 auto 16px !important;
  border-radius: 10px !important;
  background: transparent url("../app-icon-white.png") center / contain no-repeat !important;
  color: transparent !important;
  font-size: 0 !important;
  display: block !important;
}

[data-theme="light"] .boot-mark {
  background-image: url("../app-icon-dark.png") !important;
}

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

.brand small {
  display: block;
  margin-top: 1px;
  color: var(--muted);
  font: 600 10px var(--mono);
  letter-spacing: 1.5px;
}

.search-box {
  height: 36px;
  margin: 18px 0 16px;
  border: 1px solid var(--input-border);
  border-radius: 6px;
  background: var(--input-bg);
  display: flex;
  align-items: center;
  padding: 0 10px;
  gap: 8px;
  color: var(--muted);
}

.search-box > span {
  font-size: 16px;
}

.search-box input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text-primary);
  font-size: 13px;
}

.search-box input::placeholder {
  color: var(--muted);
}

.search-box kbd {
  white-space: nowrap;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 5px;
  color: var(--muted);
  font: 9px var(--mono);
}

.nav-label {
  color: var(--muted);
  font: 600 11px var(--mono);
  letter-spacing: 1.2px;
  padding: 0 10px 8px;
}

.nav-label-tools {
  display: flex;
  justify-content: space-between;
  margin-top: 18px;
}

.nav-label-tools span {
  color: var(--text-secondary);
}

.nav-link {
  height: 36px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 10px;
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 13.5px;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

.nav-link > span {
  width: 22px;
  text-align: center;
  color: var(--muted);
  font: 14px var(--mono);
}

.nav-link:hover {
  background: var(--nav-hover);
  color: var(--text-primary);
}

.nav-link.active {
  color: var(--text-primary);
  background: var(--nav-selected);
  font-weight: 600;
}

.nav-link.active > span {
  color: var(--accent);
}

.tool-nav {
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.sidebar-bottom {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px 6px 4px;
  border-top: 1px solid var(--border-subtle);
}

.local-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 12px;
}

.local-badge i {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 8px rgba(34, 197, 94, 0.4);
}

.version-label {
  color: var(--muted);
  font: 10px var(--mono);
  letter-spacing: 0.8px;
}

/* --- MAIN AREA & TOPBAR --- */
.main-area {
  min-height: 100vh;
  margin-left: 254px;
}

.topbar {
  height: 56px;
  padding: 0 32px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg);
}

.breadcrumb {
  color: var(--muted);
  font-size: 13px;
}

.breadcrumb span {
  padding: 0 8px;
  color: var(--border);
}

.breadcrumb strong {
  color: var(--text-primary);
  font-weight: 600;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.privacy-note {
  color: var(--text-secondary);
  font-size: 12px;
}

.privacy-note span {
  color: var(--accent);
  margin-right: 4px;
}

.theme-toggle-btn {
  background: var(--btn-bg);
  color: var(--btn-text);
  border: 1px solid var(--btn-border);
  border-radius: 5px;
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  transition: background 0.15s;
}

.theme-toggle-btn:hover {
  background: var(--btn-hover);
}

/* --- PAGE CONTENT & WORKBENCH LAYOUT --- */
.page-content {
  max-width: 1080px;
  padding: 28px 36px 48px;
  margin: 0;
}

.tool-page-head {
  margin: 0 0 20px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 12px;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
}

.back-link:hover {
  color: var(--accent);
}

.tool-page-head .eyebrow {
  color: var(--muted);
  font: 600 11px var(--mono);
  letter-spacing: 1.2px;
}

.crumb-slash {
  padding: 0 6px;
  color: var(--border);
}

.tool-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.tool-title-row h1 {
  margin: 6px 0 4px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.tool-title-row p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 13.5px;
}

.tool-title-icon {
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  display: grid;
  place-items: center;
  color: var(--accent);
  font: 16px var(--mono);
}

.workbench {
  max-width: 960px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  padding: 22px 26px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.workbench-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 28px;
  margin-bottom: 8px;
  color: var(--text-secondary);
  font: 600 11.5px var(--mono);
  letter-spacing: 0.8px;
  text-transform: uppercase;
}

.result-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 30px;
  margin-top: 16px;
  margin-bottom: 8px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
  color: var(--text-secondary);
  font: 600 11.5px var(--mono);
  letter-spacing: 0.8px;
  text-transform: uppercase;
}

.result-bar > span {
  flex: 1;
}

.toolbar-spacer {
  flex: 1;
}

.subtle-button, .copy-button {
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: color 0.15s, background 0.15s;
}

.subtle-button:hover, .copy-button:hover {
  color: var(--text-primary);
  background: var(--border-subtle);
}

/* --- EDITORS & OUTPUT --- */
.editor {
  display: block;
  width: 100%;
  min-height: 85px;
  height: 100px;
  max-height: 240px;
  resize: vertical;
  border: 1px solid var(--input-border);
  border-radius: 6px;
  outline: 0;
  background: var(--editor-bg);
  padding: 12px 14px;
  color: var(--text-primary);
  font: 13.5px/1.6 var(--mono);
  box-sizing: border-box;
  transition: border-color 0.15s;
}

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

.editor::placeholder, .single-input::placeholder {
  color: var(--muted);
}

.editor-compact {
  min-height: 68px !important;
  height: 76px !important;
  max-height: 180px !important;
}

.editor-large {
  min-height: 200px !important;
  height: 260px !important;
  max-height: 520px !important;
}

.output-editor {
  min-height: 44px;
  max-height: 220px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-all;
  margin: 0;
  border: 1px solid var(--editor-border);
  border-radius: 6px;
  background: var(--editor-bg);
  padding: 12px 14px;
  color: var(--text-primary);
  font: 13px/1.6 var(--mono);
  box-sizing: border-box;
}

.output-compact {
  min-height: 42px !important;
  max-height: 160px !important;
}

.output-large {
  min-height: 160px !important;
  max-height: 480px !important;
}

.single-input {
  width: 100%;
  height: 36px;
  border: 1px solid var(--input-border);
  border-radius: 5px;
  outline: 0;
  background: var(--editor-bg);
  padding: 0 12px;
  color: var(--text-primary);
  font: 13px var(--mono);
  box-sizing: border-box;
  transition: border-color 0.15s;
}

select {
  height: 36px;
  border: 1px solid var(--input-border);
  border-radius: 5px;
  outline: 0;
  background: var(--editor-bg);
  color: var(--text-primary);
  padding: 0 10px;
  font-size: 13px;
  transition: border-color 0.15s;
}

/* --- BUTTONS & CONTROLS --- */
.action-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 14px 0;
}

.check-option {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
  font-size: 13px;
  cursor: pointer;
}

.check-option input[type="checkbox"],
.check-option input[type="radio"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.primary-button, .secondary-button {
  border-radius: 5px;
  padding: 8px 18px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: background 0.15s, border-color 0.15s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.primary-button {
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--btn-text);
}

.primary-button:hover {
  background: var(--btn-hover);
  border-color: var(--accent);
}

.primary-button:active {
  background: var(--btn-pressed);
}

.secondary-button {
  border: 1px solid var(--btn-sec-border);
  background: var(--btn-sec-bg);
  color: var(--text-primary);
}

.secondary-button:hover {
  background: var(--btn-sec-hover);
}

/* --- HASH VALIDATOR SECTION --- */
.hash-validator-section {
  margin-top: 24px;
  border-top: 1px solid var(--border);
  padding-top: 18px;
}

.hash-validator-section .section-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.validator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 12px;
}

.field-label {
  display: block;
  font: 600 11px var(--mono);
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: 5px;
}

.legacy-warning {
  margin: 10px 0;
  padding: 10px 14px;
  background: rgba(232, 114, 74, 0.12);
  border: 1px solid var(--warning);
  border-radius: 6px;
  color: var(--warning);
  font-size: 12.5px;
  line-height: 1.4;
}

.validator-status {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 13.5px;
}

.status-valid {
  background: rgba(34, 197, 94, 0.12);
  color: #22c55e;
  border: 1px solid #22c55e;
}

.status-invalid {
  background: rgba(239, 68, 68, 0.12);
  color: #ef4444;
  border: 1px solid #ef4444;
}

/* --- OVERVIEW & TOOL CARDS --- */
.welcome-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 180px;
  padding: 0 10px 16px 0;
}

.eyebrow {
  color: var(--muted);
  font: 600 11px var(--mono);
  letter-spacing: 1.3px;
}

.eyebrow-dot {
  display: inline-block;
  margin-right: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

.welcome-row h1 {
  margin: 12px 0 8px;
  font: 700 36px 'Segoe UI', sans-serif;
  letter-spacing: -1.2px;
  color: var(--text-primary);
}

.welcome-row h1 span {
  color: var(--accent);
}

.welcome-copy {
  margin: 0;
  color: var(--text-secondary);
  font-size: 14px;
  max-width: 500px;
}

.welcome-art {
  width: 220px;
  height: 160px;
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: radial-gradient(ellipse, rgba(61, 80, 88, 0.25) 0%, transparent 70%);
}

.orbit {
  position: absolute;
  border: 1px solid var(--border);
  border-radius: 50%;
  transform: rotate(-22deg);
}

.orbit-one { width: 190px; height: 74px; }
.orbit-two { width: 145px; height: 110px; transform: rotate(45deg); }

.art-core {
  position: relative;
  width: 60px;
  height: 60px;
  border: 1px solid var(--border);
  border-radius: 14px;
  display: grid;
  place-content: center;
  text-align: center;
  background: var(--card-bg);
  color: var(--accent);
  box-shadow: 0 0 25px var(--accent-glow);
  font: 18px var(--mono);
  line-height: 20px;
}

.art-core b {
  font-weight: 400;
  color: var(--accent-light);
}

.art-spark {
  position: absolute;
  color: var(--accent);
}

.spark-one { top: 25px; left: 28px; font-size: 14px; }
.spark-two { right: 32px; bottom: 30px; font-size: 12px; }

.section-heading {
  margin-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.section-heading h2 {
  margin: 0;
  font: 700 20px 'Segoe UI', sans-serif;
  letter-spacing: -0.3px;
  color: var(--text-primary);
}

.section-heading p {
  margin: 4px 0 0;
  color: var(--text-secondary);
  font-size: 13px;
}

.tools-count {
  color: var(--text-secondary);
  font: 12px var(--mono);
}

.tools-count i {
  color: var(--muted);
  font-size: 10px;
  font-style: normal;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.tool-card {
  position: relative;
  min-height: 180px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px 20px 16px;
  background: var(--card-bg);
  overflow: hidden;
  transition: transform 0.15s, border-color 0.15s;
}

.tool-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tool-icon {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel);
  color: var(--accent);
  font: 14px var(--mono);
}

.card-arrow {
  color: var(--muted);
  font-size: 15px;
}

.card-category {
  display: block;
  margin-top: 14px;
  color: var(--accent);
  font: 600 10.5px var(--mono);
  letter-spacing: 1px;
}

.tool-card h3 {
  margin: 6px 0 4px;
  font: 600 16px 'Segoe UI', sans-serif;
  color: var(--text-primary);
}

.tool-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 12.5px;
  line-height: 1.45;
}

.card-shortcut {
  position: absolute;
  bottom: 14px;
  left: 20px;
  color: var(--muted);
  font: 600 9.5px var(--mono);
  letter-spacing: 0.8px;
}

.privacy-card {
  margin-top: 24px;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel2);
  display: flex;
  align-items: center;
  gap: 14px;
}

.privacy-icon {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  background: var(--card-bg);
  border-radius: 6px;
  color: var(--accent);
  font-size: 16px;
}

.privacy-card strong {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-primary);
}

.privacy-card p {
  margin: 2px 0 0;
  color: var(--text-secondary);
  font-size: 12px;
}

.privacy-check {
  margin-left: auto;
  color: #22c55e;
  font-size: 16px;
}

.string-stats {
  display: flex;
  gap: 20px;
  padding: 10px 2px 12px;
  color: var(--text-secondary);
  font-size: 12px;
}

.string-stats b {
  color: var(--text-primary);
  font: 13px var(--mono);
  font-weight: 600;
}

.transform-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.transform-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--input-border);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text-primary);
  text-align: left;
  font-size: 12.5px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.transform-row:hover {
  border-color: var(--accent);
  background: var(--border-subtle);
}

.transform-row code {
  color: var(--text-secondary);
  font: 11px var(--mono);
}

.transform-row b {
  margin-left: auto;
  color: var(--accent);
  font-size: 11px;
  font-weight: 600;
}

.error-message {
  margin-top: 12px;
  padding: 10px 14px;
  border: 1px solid #7f1d1d;
  border-radius: 6px;
  background: rgba(127, 29, 29, 0.2);
  color: #f87171;
  font-size: 12.5px;
}

.copy-status {
  margin-top: 10px;
  color: #22c55e;
  font-size: 12px;
  font-weight: 600;
}

.tool-footnote {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 12px;
}

.tool-footnote span {
  color: var(--accent);
}

.boot-copy {
  text-align: center;
  color: var(--text-secondary);
  font-size: 13px;
}

#blazor-error-ui {
  display: none;
  position: fixed;
  bottom: 0;
  width: 100%;
  padding: 12px;
  background: #7f1d1d;
  color: #fff;
  z-index: 100;
  font-size: 13px;
}

/* --- RESPONSIVE BREAKPOINTS --- */
@media (max-width: 980px) {
  .sidebar { width: 220px; }
  .main-area { margin-left: 220px; }
  .page-content { padding: 24px 20px; }
  .topbar { padding: 0 20px; }
  .validator-grid { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  .sidebar {
    position: sticky;
    top: 0;
    width: 100%;
    height: 56px;
    padding: 0 14px;
    flex-direction: row;
    align-items: center;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
  .brand { height: auto; padding: 0; font-size: 18px; }
  .brand small, .nav-label, .tool-nav, .sidebar-bottom, .sidebar > .nav-link { display: none; }
  .search-box { margin: 0 0 0 auto; width: min(46vw, 220px); height: 34px; }
  .search-box kbd { display: none; }
  .main-area { margin: 0; }
  .topbar { height: 48px; padding: 0 16px; }
  .page-content { padding: 20px 14px; }
  .tool-grid { grid-template-columns: 1fr; }
  .welcome-row { flex-direction: column; align-items: flex-start; }
  .welcome-art { display: none; }
  .workbench { padding: 16px 14px; }
  .validator-grid { grid-template-columns: 1fr; }
}