/* ================================
   ROOT VARIABLES
   ================================ */
:root {
  --clr-bg: #ffffff;
  --clr-bg-alt: #f7f7f9;
  --clr-surface: #ffffff;
  --clr-border: #e1e1e6;
  --clr-text: #1a1a2e;
  --clr-text-muted: #4b5563;
  --clr-accent: #2563eb;
  --clr-accent-hover: #1d4ed8;
  --clr-on-accent: #ffffff;
  --clr-success: #16a34a;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', 'Courier New', Courier, monospace;
  --radius: 0.5rem;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
}

/* ================================
   DARK MODE VARIABLES
   ================================ */
[data-theme="dark"] {
  --clr-bg: #0a0f14;
  --clr-bg-alt: #111827;
  --clr-surface: #1f2937;
  --clr-border: #374151;
  --clr-text: #e2e8f0;
  --clr-text-muted: #a1afc4;
  --clr-accent: #60a5fa;
  --clr-accent-hover: #93c5fd;
  --clr-on-accent: #0a0f14;
  --clr-success: #34d399;
}

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

[hidden] {
  display: none !important;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img,
video {
  max-width: 100%;
  display: block;
}

/* ================================
   SKIP LINK
   ================================ */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  background-color: var(--clr-accent);
  color: var(--clr-on-accent);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
  color: var(--clr-on-accent);
}

/* ================================
   SR ONLY
   ================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ================================
   TYPOGRAPHY
   ================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.25;
  font-weight: 700;
}

h1 { font-size: clamp(1.75rem, 1.4rem + 1.75vw, 2.75rem); }
h2 { font-size: clamp(1.375rem, 1.1rem + 1.375vw, 2rem); }
h3 { font-size: clamp(1.125rem, 1rem + 0.625vw, 1.5rem); }

p {
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--clr-accent);
  text-decoration: underline;
}

a:hover {
  color: var(--clr-accent-hover);
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--clr-bg-alt);
  border: 1px solid var(--clr-border);
  border-radius: 0.25rem;
  padding: 0.125em 0.375em;
}

/* ================================
   LAYOUT
   ================================ */
.site-main {
  width: 100%;
  max-width: 72rem;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.content-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2rem;
  align-items: start;
  margin-block: 2rem;
  min-width: 0;
}

@media (max-width: 64em) {
  .content-layout {
    grid-template-columns: 1fr;
  }
}

/* ================================
   SITE HEADER
   ================================ */
.site-header {
  border-bottom: 1px solid var(--clr-border);
  padding-block: 1rem;
  background-color: var(--clr-surface);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header__inner {
  max-width: 72rem;
  margin-inline: auto;
  padding-inline: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--clr-text);
  min-width: 0;
}

.site-header__logo:hover {
  color: var(--clr-accent);
}

.site-header__logo:focus-visible {
  outline: 3px solid var(--clr-accent);
  outline-offset: 3px;
  border-radius: var(--radius);
}

.site-header__logo-icon {
  width: 1.75rem;
  height: 1.75rem;
  flex-shrink: 0;
}

[data-theme="dark"] .site-header__logo-icon {
  filter: brightness(1.6) saturate(0.85);
}

/* ================================
   THEME TOGGLE
   ================================ */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  background: none;
  border: 1px solid var(--clr-border);
  border-radius: 50%;
  cursor: pointer;
  color: var(--clr-text-muted);
  font-size: 1.125rem;
  line-height: 1;
  transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  background-color: var(--clr-bg-alt);
}

.theme-toggle:focus-visible {
  outline: 3px solid var(--clr-accent);
  outline-offset: 3px;
}

.theme-toggle__icon--dark {
  display: none;
}

[data-theme="dark"] .theme-toggle__icon--light {
  display: none;
}

[data-theme="dark"] .theme-toggle__icon--dark {
  display: inline;
}

/* ================================
   TOOL SECTION
   ================================ */
.tool-section {
  background-color: var(--clr-bg-alt);
  border-bottom: 1px solid var(--clr-border);
  padding-block: 2.5rem;
}

.tool-section__inner {
  max-width: 72rem;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.tool-section__title {
  margin-bottom: 0.5rem;
}

.tool-section__description {
  color: var(--clr-text-muted);
  margin-bottom: 2rem;
  max-width: 60ch;
}

/* ================================
   TOOL FORM
   ================================ */
.tool-form {
  display: grid;
  gap: 1.5rem;
}

.tool-form__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.form-group--wide {
  grid-column: 1 / -1;
}

.form-group--span-3 {
  grid-column: span 3;
}

.form-group--span-2 {
  grid-column: span 2;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.form-group__label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--clr-text);
}

.form-group__label-row {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.form-group__label--required::after {
  content: ' *';
  color: var(--clr-accent);
}

.form-group__input {
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 1rem;
  background-color: var(--clr-surface);
  color: var(--clr-text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  width: 100%;
}

.form-group__input:focus {
  outline: 2px solid var(--clr-accent);
  outline-offset: 2px;
  border-color: var(--clr-accent);
}

.form-group__textarea {
  resize: vertical;
  min-height: 7rem;
  font-family: var(--font-mono);
  line-height: 1.5;
}

.form-group__hint {
  font-size: 0.8125rem;
  color: var(--clr-text-muted);
}

.form-group__optional {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--clr-text-muted);
}

.form-group__reset-btn {
  margin-left: 0.5rem;
  padding: 0.125rem 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  background: transparent;
  color: var(--clr-text-muted);
  cursor: pointer;
  vertical-align: middle;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.form-group__reset-btn:hover {
  color: var(--clr-accent);
  border-color: var(--clr-accent);
}

.form-group__reset-btn:focus-visible {
  outline: 3px solid var(--clr-accent);
  outline-offset: 2px;
}

/* ================================
   RESULTS
   ================================ */
.results {
  margin-top: 1.75rem;
  background-color: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.results__display {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1;
}

.results__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.075em;
  color: var(--clr-text-muted);
}

.results__display-value {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  color: var(--clr-text);
  word-break: break-all;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.results__copy-btn {
  padding: 0.5rem 1.25rem;
  background-color: var(--clr-accent);
  color: var(--clr-on-accent);
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s ease;
  white-space: nowrap;
}

.results__copy-btn:hover {
  background-color: var(--clr-accent-hover);
  color: var(--clr-on-accent);
}

.results__copy-btn:focus-visible {
  outline: 3px solid var(--clr-accent);
  outline-offset: 3px;
}

.results__copy-btn--copied {
  background-color: var(--clr-success);
}

.results__meta {
  margin-top: 0.375rem;
  font-size: 0.875rem;
  color: var(--clr-text-muted);
}

.candidate-table-wrap {
  margin-top: 1.5rem;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  background-color: var(--clr-surface);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.candidate-table-wrap__title {
  font-size: 1rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--clr-border);
}

.candidate-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.candidate-table th,
.candidate-table td {
  border-bottom: 1px solid var(--clr-border);
  padding: 0.625rem 1rem;
  text-align: left;
  vertical-align: top;
}

.candidate-table td code {
  word-break: break-all;
  overflow-wrap: anywhere;
}

.candidate-table tr:last-child td {
  border-bottom: 0;
}

/* ================================
   TOOL TOGGLE ROW
   ================================ */
.tool-toggle-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding: 0.875rem 1rem;
  background-color: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
}

.tool-toggle-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tool-toggle-group__label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  white-space: nowrap;
}

.mode-btn {
  padding: 0.3125rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  background: var(--clr-surface);
  color: var(--clr-text-muted);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.mode-btn:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
}

.mode-btn--active {
  background-color: var(--clr-accent);
  color: var(--clr-on-accent);
  border-color: var(--clr-accent);
}

.mode-btn--active:hover {
  background-color: var(--clr-accent-hover);
  color: var(--clr-on-accent);
}

.mode-btn:focus-visible {
  outline: 3px solid var(--clr-accent);
  outline-offset: 2px;
}

/* ================================
   PRESET BAR
   ================================ */
.preset-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-top: 0.375rem;
}

.preset-btn {
  padding: 0.25rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  background: var(--clr-surface);
  color: var(--clr-text-muted);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.preset-btn:hover {
  background-color: var(--clr-accent);
  color: var(--clr-on-accent);
  border-color: var(--clr-accent);
}

.preset-btn:focus-visible {
  outline: 3px solid var(--clr-accent);
  outline-offset: 2px;
}

/* ================================
   CANDIDATE COPY BUTTON + ESTIMATE
   ================================ */
.candidate-copy-btn {
  padding: 0.1875rem 0.625rem;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  background: var(--clr-surface);
  color: var(--clr-text-muted);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.candidate-copy-btn:hover {
  background-color: var(--clr-accent);
  color: var(--clr-on-accent);
  border-color: var(--clr-accent);
}

.candidate-copy-btn:focus-visible {
  outline: 3px solid var(--clr-accent);
  outline-offset: 2px;
}

.estimate-pending {
  color: var(--clr-text-muted);
  font-size: 0.8125rem;
}

/* ================================
   DPR PANEL
   ================================ */
.dpr-panel {
  margin-top: 1.5rem;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  background: var(--clr-surface);
  overflow: hidden;
}

.dpr-panel__title {
  font-size: 1rem;
  margin: 0;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--clr-border);
}

.dpr-panel__desc {
  padding: 0.75rem 1rem 0;
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  margin: 0;
}

.dpr-panel__table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.dpr-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.dpr-table th,
.dpr-table td {
  border-bottom: 1px solid var(--clr-border);
  padding: 0.5rem 1rem;
  text-align: left;
  white-space: nowrap;
}

.dpr-table tr:last-child td {
  border-bottom: 0;
}

.dpr-table__status {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.1875rem 0.5rem;
  border-radius: 9999px;
}

.dpr-table__status--good {
  background-color: rgba(22, 163, 74, 0.15);
  color: var(--clr-success);
}

.dpr-table__status--over {
  background-color: rgba(245, 158, 11, 0.15);
  color: #d97706;
}

.dpr-table__status--under {
  background-color: rgba(239, 68, 68, 0.15);
  color: #dc2626;
}

[data-theme="dark"] .dpr-table__status--over {
  color: #fbbf24;
}

[data-theme="dark"] .dpr-table__status--under {
  color: #f87171;
}

/* ================================
   QUALITY SLIDER
   ================================ */
.quality-group {
  margin-bottom: 1rem;
}

.quality-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 0.375rem;
  border-radius: 9999px;
  background: var(--clr-border);
  cursor: pointer;
  margin-top: 0.375rem;
}

.quality-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 1.125rem;
  height: 1.125rem;
  border-radius: 50%;
  background: var(--clr-accent);
  cursor: pointer;
}

.quality-slider::-moz-range-thumb {
  width: 1.125rem;
  height: 1.125rem;
  border: none;
  border-radius: 50%;
  background: var(--clr-accent);
  cursor: pointer;
}

.quality-slider:focus-visible {
  outline: 3px solid var(--clr-accent);
  outline-offset: 3px;
}

/* ================================
   LCP WARNING
   ================================ */
.lcp-warning {
  margin-bottom: 0.75rem;
  padding: 0.625rem 0.875rem;
  background-color: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.4);
  border-radius: var(--radius);
  font-size: 0.875rem;
  color: #92400e;
}

[data-theme="dark"] .lcp-warning {
  color: #fcd34d;
  background-color: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.3);
}

.candidate-gap-warning {
  margin-bottom: 0.75rem;
  padding: 0.625rem 0.875rem;
  background-color: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.35);
  border-radius: var(--radius);
  font-size: 0.875rem;
  color: #92400e;
}

[data-theme="dark"] .candidate-gap-warning {
  color: #fcd34d;
  background-color: rgba(245, 158, 11, 0.06);
  border-color: rgba(245, 158, 11, 0.25);
}

.results--preload {
  border-top: 2px solid var(--clr-accent);
  background-color: var(--clr-bg-alt);
}

/* ================================
   CONTENT SECTION
   ================================ */
.content-section {
  padding-block: 2rem 0;
  min-width: 0;
  overflow: hidden;
}

.content-section__body h2 {
  margin-bottom: 0.75rem;
  margin-top: 2rem;
}

.content-section__body h2:first-child {
  margin-top: 0;
}

.content-section__body h3 {
  margin-bottom: 0.5rem;
  margin-top: 1.5rem;
}

.content-section__body p {
  color: var(--clr-text);
  max-width: 70ch;
}

.content-section__body ul,
.content-section__body ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.content-section__body li {
  margin-bottom: 0.375rem;
}

/* ================================
   FAQ SECTION
   ================================ */
.faq-section {
  padding-block: 2.5rem;
  border-top: 1px solid var(--clr-border);
}

.faq-section__inner {
  max-width: 72rem;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.faq-section__title {
  margin-bottom: 1.5rem;
}

.faq__item {
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  margin-bottom: 0.625rem;
  overflow: hidden;
}

.faq__question {
  padding: 1rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--clr-surface);
  transition: background-color 0.15s ease;
}

.faq__question:hover {
  background-color: var(--clr-bg-alt);
}

.faq__question::-webkit-details-marker {
  display: none;
}

.faq__question::after {
  content: '+';
  font-size: 1.25rem;
  font-weight: 400;
  flex-shrink: 0;
  margin-left: 1rem;
}

details[open] .faq__question::after {
  content: '-';
}

.faq__answer {
  padding: 0 1.25rem 1rem;
  color: var(--clr-text);
  background-color: var(--clr-surface);
}

/* ================================
   CONTENT SIDEBAR
   ================================ */
.content-sidebar {
  position: sticky;
  top: 5rem;
}

/* ================================
   EXPORT SECTION
   ================================ */
.export-section {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--clr-border);
}

.export-section__title {
  font-size: clamp(1.125rem, 1rem + 0.625vw, 1.5rem);
  margin-bottom: 0.375rem;
}

.export-section__desc {
  color: var(--clr-text-muted);
  margin-bottom: 1.25rem;
  max-width: 60ch;
}

/* ================================
   UPLOAD ZONE
   ================================ */
.upload-zone {
  position: relative;
  border: 2px dashed var(--clr-border);
  border-radius: var(--radius);
  background-color: var(--clr-bg-alt);
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
  margin-bottom: 1rem;
  overflow: hidden;
}

.upload-zone:hover,
.upload-zone--drag-over {
  border-color: var(--clr-accent);
  background-color: var(--clr-surface);
}

.upload-zone__input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  z-index: 1;
}

.upload-zone__placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1.25rem;
  gap: 0.375rem;
  pointer-events: none;
}

.upload-zone__icon {
  font-size: 2.25rem;
  line-height: 1;
  margin-bottom: 0.25rem;
}

.upload-zone__text {
  font-size: 0.9375rem;
  color: var(--clr-text-muted);
  text-align: center;
  margin: 0;
}

.upload-zone__browse {
  color: var(--clr-accent);
  text-decoration: underline;
}

.upload-zone__hint {
  font-size: 0.8125rem;
  color: var(--clr-text-muted);
  margin: 0;
}

.upload-zone__preview {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  flex-wrap: wrap;
}

.upload-zone__preview-img {
  width: 5rem;
  height: 3.5rem;
  object-fit: cover;
  border-radius: calc(var(--radius) - 2px);
  flex-shrink: 0;
}

.upload-zone__preview-meta {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  margin: 0;
  word-break: break-all;
}

.upload-zone__clear-btn {
  margin-top: 0.5rem;
  padding: 0.3125rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  background: transparent;
  color: var(--clr-text-muted);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.upload-zone__clear-btn:hover {
  background-color: rgba(239, 68, 68, 0.1);
  color: #dc2626;
  border-color: #dc2626;
}

[data-theme="dark"] .upload-zone__clear-btn:hover {
  background-color: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border-color: #f87171;
}

.upload-zone__clear-btn:focus-visible {
  outline: 3px solid var(--clr-accent);
  outline-offset: 2px;
}

/* ================================
   EXPORT ACTIONS
   ================================ */
.export-avif-note {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  padding: 0.625rem 0.875rem;
  background-color: var(--clr-bg-alt);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.export-exif-note {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  padding: 0.625rem 0.875rem;
  background-color: rgba(245, 158, 11, 0.06);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

[data-theme="dark"] .export-exif-note {
  color: #fcd34d;
  background-color: rgba(245, 158, 11, 0.05);
  border-color: rgba(245, 158, 11, 0.2);
}

.export-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.export-btn {
  padding: 0.625rem 1.5rem;
  background-color: var(--clr-accent);
  color: var(--clr-on-accent);
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s ease;
  white-space: nowrap;
}

.export-btn:hover:not(:disabled) {
  background-color: var(--clr-accent-hover);
  color: var(--clr-on-accent);
}

.export-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.export-btn:focus-visible {
  outline: 3px solid var(--clr-accent);
  outline-offset: 3px;
}

.export-progress {
  flex: 1;
  min-width: 8rem;
  height: 0.5rem;
  background-color: var(--clr-border);
  border-radius: 9999px;
  overflow: hidden;
}

.export-progress__bar {
  height: 100%;
  background-color: var(--clr-accent);
  border-radius: 9999px;
  transition: width 0.2s ease;
  width: 0%;
}

.export-status {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  flex-basis: 100%;
  margin: 0;
}

/* ================================
   SITE FOOTER
   ================================ */
.site-footer {
  background-color: var(--clr-bg-alt);
  border-top: 1px solid var(--clr-border);
  padding-block: 1.5rem;
  margin-top: 3rem;
}

.site-footer__inner {
  max-width: 72rem;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.site-footer__copy {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  text-align: center;
}

/* ================================
   RESPONSIVE — TABLET (max 48em / 768px)
   ================================ */
@media (max-width: 48em) {
  .site-main {
    padding-inline: 0;
  }

  .content-layout {
    padding-inline: 1rem;
  }

  .tool-section {
    padding-block: 2rem;
  }

  .tool-form {
    grid-template-columns: 1fr;
  }

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

  .form-group--span-3 {
    grid-column: 1 / -1;
  }

  .results {
    flex-direction: column;
    align-items: stretch;
  }

  .results__display-value {
    font-size: 0.9375rem;
    word-break: break-all;
  }

  .results__copy-btn {
    align-self: flex-start;
  }

  .ad-slot--inline {
    display: none;
  }

  .ad-slot--leaderboard,
  .ad-slot--rectangle {
    margin-inline: 1rem;
  }
}

/* ================================
   RESPONSIVE — MOBILE (max 36em / 576px)
   ================================ */
@media (max-width: 36em) {
  .tool-form__grid {
    grid-template-columns: 1fr;
  }

  .form-group--span-3,
  .form-group--span-2 {
    grid-column: 1 / -1;
  }
  .tool-section__inner,
  .faq-section__inner {
    padding-inline: 0.75rem;
  }

  .site-header__inner,
  .site-footer__inner {
    padding-inline: 0.75rem;
  }

  .content-layout {
    padding-inline: 0.75rem;
  }

  .ad-slot--leaderboard,
  .ad-slot--rectangle {
    margin-inline: 0.75rem;
  }

  .results {
    padding: 1rem;
  }

  .results__display-value {
    font-size: 0.8125rem;
  }

  .faq__question {
    padding: 0.75rem 1rem;
    font-size: 0.9375rem;
  }

  .faq__answer {
    padding: 0 1rem 0.75rem;
    font-size: 0.9375rem;
  }

  .content-section__body p,
  .content-section__body ul,
  .content-section__body ol {
    max-width: 100%;
  }
}

/* ================================
   REDUCED MOTION
   ================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}