/* ==========================================================================
   Aman Kumar Pandey — Developer & Security Tools Styles
   Local-first, accessible, editorial design matching portfolio design system.
   ========================================================================== */

:root {
  color-scheme: dark;
  --bg: #030303;
  --surface: #0a0a0a;
  --surface-2: #121212;
  --text: #f5f5f5;
  --muted: #b0b0b0;
  --faint: #737373;
  --line: #262626;
  --line-strong: #404040;
  --invert: #ffffff;
  --invert-text: #000000;
  --focus: #ffffff;
  --shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
  --radius: 3px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
  --container: 1200px;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #ffffff;
  --surface: #f8f9fa;
  --surface-2: #f1f3f5;
  --text: #0d0d0d;
  --muted: #495057;
  --faint: #6c757d;
  --line: #e2e4e7;
  --line-strong: #ced4da;
  --invert: #000000;
  --invert-text: #ffffff;
  --focus: #000000;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.07);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body, button, input, textarea, select {
  font-family: var(--sans);
}

p, h1, h2, h3, h4 {
  margin: 0;
}

h1, h2, h3, h4 {
  font-family: var(--sans);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--text);
}

.hero h1 {
  font-size: clamp(2.2rem, 4.8vw, 3.8rem);
  max-width: 800px;
}

.tool-section h2,
.tool-index h2,
.section-head h2 {
  font-size: clamp(1.6rem, 2.8vw, 2.3rem);
  max-width: 650px;
  line-height: 1.2;
}

.mono {
  font-family: var(--mono);
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 10px;
}

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

input, textarea, select, button {
  color: var(--text);
}

input[type="checkbox"], input[type="radio"], input[type="range"] {
  accent-color: var(--text);
}

:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  left: 20px;
  top: 20px;
  z-index: 100;
  transform: translateY(-160%);
  background: var(--invert);
  color: var(--invert-text);
  padding: 10px 18px;
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: transform 160ms ease;
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.shell {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.top-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: transparent;
  z-index: 70;
  pointer-events: none;
}

.top-progress span {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--text);
  transform-origin: left;
}

/* Site Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.nav-shell {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 0.84rem;
  font-weight: 700;
  border: 1px solid var(--line);
  padding: 6px 12px;
  border-radius: var(--radius);
}

.brand:hover {
  border-color: var(--text);
}

.desktop-nav {
  display: flex;
  gap: 24px;
  align-items: center;
}

.desktop-nav a {
  font-size: 0.9rem;
  color: var(--muted);
  transition: color 160ms ease;
}

.desktop-nav a:hover,
.desktop-nav a[aria-current="page"] {
  color: var(--text);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  padding: 6px 10px;
  background: transparent;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 160ms ease, color 160ms ease;
}

.theme-toggle:hover {
  border-color: var(--text);
}

.theme-dot {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--text);
  box-shadow: 0 0 8px var(--text);
  transition: transform 160ms ease, background-color 160ms ease;
}

.theme-label {
  color: var(--muted);
}

.menu-button {
  display: none;
  width: 36px;
  height: 36px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
}

.menu-button span {
  display: block;
  height: 1.5px;
  background: var(--text);
  margin: 4px 0;
}

.mobile-nav {
  display: none;
  padding: 10px 24px 18px;
  border-top: 1px solid var(--line);
}

.mobile-nav.open {
  display: block;
}

.mobile-nav a {
  display: block;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.94rem;
}

.mobile-nav a:hover {
  color: var(--text);
}

/* Hero Section */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.7fr);
  gap: 56px;
  padding: 56px 0 44px;
  border-bottom: 1px solid var(--line);
}

.hero-text {
  font-size: 1.05rem;
  color: var(--muted);
  margin-top: 18px;
  max-width: 650px;
}

.hero-side {
  display: grid;
  gap: 16px;
  align-content: end;
}

.hero-note {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.hero-note strong {
  display: block;
  font-size: 0.92rem;
  color: var(--text);
  margin: 3px 0;
}

.hero-note p {
  color: var(--muted);
  font-size: 0.82rem;
}

/* Tool Launcher */
.tool-launcher {
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
}

.launcher-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.search-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  max-width: 500px;
}

.search-wrap input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 9px 14px;
  font-size: 0.9rem;
  color: var(--text);
  border-radius: var(--radius);
}

.quick-actions {
  display: flex;
  gap: 10px;
}

.quick-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.quick-grid a {
  font-family: var(--mono);
  font-size: 0.74rem;
  border: 1px solid var(--line);
  padding: 6px 10px;
  border-radius: var(--radius);
  color: var(--muted);
  transition: all 160ms ease;
}

.quick-grid a:hover {
  color: var(--text);
  border-color: var(--text);
}

.search-empty {
  color: var(--faint);
  margin-top: 14px;
  font-size: 0.9rem;
}

/* Tool Index */
.tool-index {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: 48px;
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--line);
}

.index-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 24px;
}

.index-links a {
  border-top: 1px solid var(--line);
  padding: 10px 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.78rem;
  transition: color 160ms ease;
}

.index-links a:hover {
  color: var(--text);
}

/* Tool Sections */
.tool-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, 0.75fr);
  gap: 40px;
  align-items: start;
  margin-bottom: 28px;
}

.section-head > p {
  color: var(--muted);
  font-size: 0.92rem;
  padding-top: 0.2rem;
}

.tool-grid {
  display: grid;
  gap: 18px;
}

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

.tool-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tool-card, .editor-shell {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.tool-card h3 {
  font-size: 1.15rem;
  margin: 8px 0;
}

.tool-card p {
  color: var(--muted);
  margin-bottom: 16px;
  font-size: 0.88rem;
}

.tool-meta {
  display: flex;
  justify-content: space-between;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

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

.control-grid label, .stack label {
  font-size: 0.76rem;
  font-family: var(--mono);
  color: var(--faint);
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 6px;
}

.checks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding-top: 4px;
}

.checks label {
  display: flex;
  gap: 6px;
  align-items: center;
  color: var(--text);
  font-size: 0.82rem;
}

.input-field, .output-field, .input-area, .output-area, select {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--line);
  padding: 9px 12px;
  font-size: 0.88rem;
  border-radius: var(--radius);
}

select {
  cursor: pointer;
}

.input-area, .output-area {
  resize: vertical;
  min-height: 100px;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.5;
}

.output-area {
  background: var(--surface-2);
}

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

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}

.button {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  padding: 8px 14px;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: all 160ms ease;
}

.button:hover {
  border-color: var(--text);
}

.button.primary {
  background: var(--invert);
  color: var(--invert-text);
  border-color: var(--invert);
  font-weight: 600;
}

.button.primary:hover {
  opacity: 0.92;
}

.button.full {
  width: 100%;
}

.button-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 10px 0;
}

.status-line {
  min-height: 18px;
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.78rem;
  font-family: var(--mono);
}

.palette {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  margin-top: 12px;
}

.palette-swatch {
  aspect-ratio: 1.4;
  border: 1px solid var(--line);
  display: flex;
  align-items: flex-end;
  padding: 6px;
  font-family: var(--mono);
  font-size: 0.68rem;
  border-radius: var(--radius);
}

.palette-swatch span {
  background: rgba(0, 0, 0, 0.4);
  color: #fff;
  padding: 2px 4px;
  border-radius: 2px;
}

/* ==========================================================================
   Calculator UI/UX
   ========================================================================== */
.calculator-wrapper {
  display: grid;
  grid-template-columns: minmax(0, 480px) minmax(260px, 1fr);
  gap: 24px;
  align-items: start;
}

.calculator-shell {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.calculator-screen {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.calc-screen-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.calc-screen-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--faint);
}

.calc-live-badge {
  color: #10b981;
  font-size: 0.68rem;
  font-family: var(--mono);
}

.calc-display {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text);
  font-family: var(--mono);
  font-size: 1.35rem;
  font-weight: 600;
  padding: 0;
  outline: none;
  text-transform: none;
}

.calc-result {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-top: 1px dashed var(--line);
  padding-top: 10px;
  margin-top: 4px;
}

.calc-result output {
  font-family: var(--mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  text-align: right;
  word-break: break-all;
  text-transform: none;
}

.calc-info-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.calc-info-card {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 20px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.calc-shortcuts-list {
  list-style: none;
  padding: 0;
  margin: 10px 0 0;
  display: grid;
  gap: 10px;
}

.calc-shortcuts-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.84rem;
  color: var(--muted);
}

.calc-shortcuts-list kbd {
  display: inline-block;
  padding: 3px 7px;
  font-family: var(--mono);
  font-size: 0.74rem;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 3px;
  color: var(--text);
  box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.calculator-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.calc-functions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.calc-fn-btn {
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 7px 4px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 120ms ease;
  text-align: center;
}

.calc-fn-btn:hover {
  border-color: var(--text);
  color: var(--text);
}

.calc-fn-btn:active {
  transform: scale(0.96);
}

.calc-keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.calc-key {
  height: 44px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--text);
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: all 120ms ease;
  user-select: none;
}

.calc-key:hover {
  border-color: var(--text);
  background: color-mix(in srgb, var(--surface-2) 80%, var(--text));
}

.calc-key:active {
  transform: scale(0.96);
}

.calc-key.clear {
  color: #f87171;
  border-color: rgba(248, 113, 113, 0.3);
}

.calc-key.clear:hover {
  background: rgba(248, 113, 113, 0.1);
  border-color: #f87171;
}

.calc-key.back {
  color: var(--muted);
}

.calc-key.op {
  color: var(--text);
  background: color-mix(in srgb, var(--surface-2) 90%, var(--text));
  font-weight: 700;
}

.calc-key.span-2 {
  grid-column: span 2;
}

.calc-key.equals {
  background: var(--invert);
  color: var(--invert-text);
  border-color: var(--invert);
  font-weight: 800;
}

.calc-key.equals:hover {
  opacity: 0.9;
}

/* Additional Tool Components */
.json-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 12px;
}

.json-panels > div {
  border: 1px solid var(--line);
  background: var(--surface-2);
  padding: 10px 12px;
  border-radius: var(--radius);
}

.json-panels pre {
  margin: 6px 0 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 160px;
  overflow-y: auto;
  color: var(--text);
}

.output-panel {
  border: 1px solid var(--line);
  background: var(--surface-2);
  padding: 12px 14px;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 0.82rem;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 48px;
  margin-top: 10px;
  color: var(--text);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 12px;
}

.stats-grid > div {
  border: 1px solid var(--line);
  background: var(--surface-2);
  padding: 10px 8px;
  border-radius: var(--radius);
  text-align: center;
}

.stats-grid strong {
  display: block;
  font-size: 1.3rem;
  color: var(--text);
}

.stats-grid span {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--faint);
  text-transform: uppercase;
}

.converter-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

.converter-grid label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--faint);
}

.converter-grid select,
.converter-grid input {
  width: 100%;
}

.conversion-result {
  border: 1px solid var(--line);
  background: var(--surface-2);
  padding: 16px 20px;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  min-height: 54px;
  display: flex;
  align-items: center;
}

.contrast-result {
  margin-top: 12px;
  border: 1px solid var(--line);
  background: var(--surface-2);
  padding: 12px;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 0.84rem;
  font-weight: 600;
}

.markdown-preview {
  margin-top: 10px;
  border: 1px solid var(--line);
  background: var(--surface-2);
  padding: 14px;
  border-radius: var(--radius);
  min-height: 120px;
  max-height: 240px;
  overflow-y: auto;
  font-size: 0.88rem;
  color: var(--text);
}

.pick-output {
  display: block;
  margin-top: 10px;
  border: 1px solid var(--line);
  background: var(--surface-2);
  padding: 14px;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 700;
  text-align: center;
  color: var(--text);
}

.editor-shell {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.editor-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.editor-input {
  width: 100%;
  min-height: 220px;
  background: var(--bg);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 14px;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.5;
  resize: vertical;
}

.editor-output {
  border: 1px solid var(--line);
  background: var(--surface-2);
  padding: 12px;
  border-radius: var(--radius);
}

.editor-output pre {
  margin: 6px 0 0;
  font-family: var(--mono);
  font-size: 0.82rem;
  white-space: pre-wrap;
  max-height: 160px;
  overflow-y: auto;
}

.diff-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.diff-output {
  margin-top: 14px;
  border: 1px solid var(--line);
  background: var(--bg);
  padding: 14px;
  font-family: var(--mono);
  font-size: 0.8rem;
  max-height: 280px;
  overflow: auto;
  border-radius: var(--radius);
}

.diff-output div {
  padding: 2px 4px;
}

.diff-add {
  background: rgba(35, 134, 54, 0.15);
  color: #3fb950;
}

.diff-del {
  background: rgba(218, 54, 51, 0.15);
  color: #f85149;
}

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--invert);
  color: var(--invert-text);
  padding: 10px 18px;
  font-family: var(--mono);
  font-size: 0.8rem;
  border-radius: var(--radius);
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: all 200ms ease;
  z-index: 100;
}

.toast.show {
  opacity: 1;
  transform: none;
}

/* Site Footer */
.site-footer {
  padding: 32px 0 40px;
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  color: var(--faint);
  font-size: 0.84rem;
}

.footer-grid strong {
  display: block;
  color: var(--text);
  font-size: 0.88rem;
}

.footer-grid > div:first-child span {
  display: block;
  margin-top: 2px;
}

.footer-grid > div:last-child {
  text-align: right;
}

.footer-grid a {
  display: inline-block;
  margin-top: 4px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Responsive */
@media (max-width: 1024px) {
  .desktop-nav {
    display: none;
  }
  .menu-button {
    display: block;
  }
  .tool-grid.three {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .hero, .tool-index, .section-head {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .tool-grid.two, .tool-grid.three {
    grid-template-columns: 1fr;
  }
  .diff-grid {
    grid-template-columns: 1fr;
  }
  .index-links {
    grid-template-columns: 1fr;
  }
  .calculator-wrapper {
    grid-template-columns: 1fr;
  }
  .converter-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-grid {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
  }
}