/* ==========================================================================
   Tools Pages — Web Design Stack
   Config panels, option selectors, preview pane, responsive layout
   ========================================================================== */

/* ==========================================================================
   Tools Landing — Featured Tool Card
   ========================================================================== */

.tool-feature {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  position: relative;
  overflow: hidden;
  transition: border-color var(--duration-lg) var(--ease-out),
              box-shadow var(--duration-lg) var(--ease-out);
}

.tool-feature::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), transparent 70%);
  opacity: 0;
  transition: opacity var(--duration-lg) var(--ease-out);
}

.tool-feature:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06),
              0 1px 4px rgba(0, 0, 0, 0.04);
}

.tool-feature:hover::before {
  opacity: 1;
}

@media (min-width: 768px) {
  .tool-feature {
    grid-template-columns: 1fr 1fr;
    padding: var(--space-10);
    gap: var(--space-10);
  }
}

@media (min-width: 1024px) {
  .tool-feature {
    grid-template-columns: 1.15fr 1fr;
  }
}

/* --- Content column --- */

.tool-feature__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  justify-content: center;
}

.tool-feature__badge {
  display: inline-flex;
  align-self: flex-start;
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: 2px;
}

.tool-feature__title {
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
}

.tool-feature__desc {
  font-size: var(--text-base);
  color: var(--color-ink-secondary);
  line-height: var(--leading-normal);
  max-width: 48ch;
}

/* Feature tags */

.tool-feature__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding-top: var(--space-2);
}

.tool-feature__tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-ink-secondary);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 2px;
}

.tool-feature__tag svg {
  flex-shrink: 0;
  opacity: 0.55;
}

/* Platform list */

.tool-feature__platforms {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-ink-tertiary);
}

.tool-feature__platforms-label {
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  margin-right: var(--space-1);
}

.tool-feature__platform {
  font-weight: var(--weight-medium);
  color: var(--color-ink-secondary);
}

.tool-feature__platform-sep {
  opacity: 0.4;
}

/* CTA within featured card */

.tool-feature .cta-link {
  margin-top: var(--space-2);
}

/* --- Preview column (decorative editor) --- */

.tool-feature__preview {
  display: none;
}

@media (min-width: 768px) {
  .tool-feature__preview {
    display: flex;
    align-items: stretch;
  }
}

.tool-feature__editor {
  display: flex;
  flex-direction: column;
  width: 100%;
  background-color: var(--color-dark-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12),
              0 2px 8px rgba(0, 0, 0, 0.08);
  transition: transform var(--duration-lg) var(--ease-out),
              box-shadow var(--duration-lg) var(--ease-out);
}

.tool-feature:hover .tool-feature__editor {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15),
              0 4px 12px rgba(0, 0, 0, 0.1);
}

.tool-feature__editor-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-dark-surface);
  border-bottom: 1px solid var(--color-dark-border);
}

.tool-feature__editor-dots {
  display: flex;
  gap: 6px;
}

.tool-feature__editor-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-dark-border);
}

.tool-feature__editor-filename {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-dark-ink-secondary);
}

.tool-feature__editor-body {
  flex: 1;
  padding: var(--space-4) var(--space-5);
  overflow: hidden;
}

.tool-feature__editor-body code {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.8;
  color: var(--color-dark-ink);
  background: none;
  padding: 0;
  white-space: pre;
  display: block;
}

.tfe-comment {
  color: var(--color-accent);
  font-weight: var(--weight-medium);
}

.tfe-heading {
  color: var(--color-dark-ink-secondary);
}

/* --- Upcoming tools bar --- */

.tool-upcoming {
  margin-top: var(--space-6);
}

.tool-upcoming__inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border: 1px dashed var(--color-border);
  background-color: var(--color-surface);
  opacity: 0.55;
}

.tool-upcoming__icon {
  flex-shrink: 0;
  color: var(--color-ink-tertiary);
}

.tool-upcoming__text {
  font-size: var(--text-sm);
  color: var(--color-ink-secondary);
  line-height: var(--leading-normal);
}

.tool-upcoming__text strong {
  color: var(--color-ink);
  font-weight: var(--weight-medium);
}

/* ==========================================================================
   Builder — Hero
   ========================================================================== */

.builder-hero {
  padding: var(--space-16) 0 var(--space-10);
}

.builder-hero__heading {
  max-width: 20ch;
  margin-bottom: var(--space-5);
}

.builder-hero__sub {
  font-size: var(--text-lg);
  color: var(--color-ink-secondary);
  max-width: 56ch;
  line-height: var(--leading-normal);
  margin-bottom: var(--space-8);
}

/* --- Builder Steps --- */

.builder-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  list-style: none;
  margin-bottom: var(--space-8);
}

@media (min-width: 640px) {
  .builder-steps {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
  }
}

.builder-step {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}

@media (min-width: 640px) {
  .builder-step {
    flex-direction: column;
  }
}

.builder-step__number {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: 50%;
}

.builder-step__title {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  line-height: var(--leading-snug);
  margin-bottom: var(--space-1);
}

.builder-step__desc {
  font-size: var(--text-sm);
  color: var(--color-ink-secondary);
  line-height: var(--leading-normal);
}

/* ==========================================================================
   Environment Cards
   ========================================================================== */

.env-desc {
  font-size: var(--text-sm);
  color: var(--color-ink-secondary);
  margin-bottom: var(--space-5);
}

.env-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .env-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .env-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

.env-card {
  text-align: left;
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg);
  cursor: pointer;
  transition: border-color var(--duration) var(--ease-out),
              background-color var(--duration) var(--ease-out);
}

.env-card:hover {
  border-color: var(--color-ink-tertiary);
}

.env-card.is-active {
  border-color: var(--color-ink);
  background-color: var(--color-surface);
}

.env-card__icon {
  width: 24px;
  height: 24px;
  object-fit: contain;
  margin-bottom: var(--space-3);
  border-radius: 2px;
  filter: grayscale(1);
  opacity: 0.6;
  transition: filter var(--duration) var(--ease-out),
              opacity var(--duration) var(--ease-out);
}

.env-card:hover .env-card__icon,
.env-card.is-active .env-card__icon {
  filter: grayscale(0);
  opacity: 1;
}

.env-card__title {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  margin-bottom: var(--space-1);
}

.env-card__file {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-secondary);
  word-break: break-all;
}

/* ==========================================================================
   Builder — Two-Column Layout
   ========================================================================== */

.builder-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: start;
}

@media (min-width: 1024px) {
  .builder-layout {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-10);
  }
}

.builder__config {
  display: flex;
  flex-direction: column;
  gap: var(--space-10);
}

@media (min-width: 1024px) {
  .builder__preview {
    position: sticky;
    top: 5rem;
    max-height: calc(100vh - 6rem);
    display: flex;
    flex-direction: column;
  }
}

/* ==========================================================================
   Config Sections
   ========================================================================== */

.config-section {
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-border);
  transition: opacity var(--duration) var(--ease-out);
}

.config-section:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

/* Header row: label + description on the left, toggle on the right */
.config-section__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
}

.config-section__header .overline {
  margin-bottom: var(--space-2);
}

.config-section__desc {
  font-size: var(--text-sm);
  color: var(--color-ink-secondary);
}

/* Body: collapsible content area */
.config-section__body {
  margin-top: var(--space-5);
}

/* Collapsed state */
.config-section.is-collapsed .config-section__body {
  display: none;
}

.config-section.is-collapsed .config-section__header > :first-child {
  opacity: 0.35;
}

.config-section.is-collapsed {
  padding-bottom: var(--space-5);
}

/* ==========================================================================
   Section Toggle Switch
   ========================================================================== */

.section-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  cursor: pointer;
  margin-top: 2px;
}

.section-toggle input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.section-toggle__track {
  position: relative;
  width: 36px;
  height: 20px;
  background-color: var(--color-ink-tertiary);
  border-radius: 10px;
  transition: background-color var(--duration) var(--ease-out);
}

.section-toggle__track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background-color: #fff;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: transform var(--duration) var(--ease-out);
}

.section-toggle input:checked + .section-toggle__track {
  background-color: var(--color-ink);
}

.section-toggle input:checked + .section-toggle__track::after {
  transform: translateX(16px);
}

.section-toggle input:focus-visible + .section-toggle__track {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ==========================================================================
   Option Buttons (single-select groups)
   ========================================================================== */

.option-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.option-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg);
  cursor: pointer;
  transition: border-color var(--duration) var(--ease-out),
              background-color var(--duration) var(--ease-out),
              color var(--duration) var(--ease-out);
  min-width: 0;
  flex: 1 1 auto;
  text-align: center;
}

.option-btn:hover {
  border-color: var(--color-ink-tertiary);
}

.option-btn.is-active {
  background-color: var(--color-ink);
  color: var(--color-bg);
  border-color: var(--color-ink);
}

.option-btn__sub {
  font-size: var(--text-xs);
  font-weight: var(--weight-normal);
  opacity: 0.7;
}

/* ==========================================================================
   Checkbox Groups
   ========================================================================== */

.check-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.check-group__label {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-ink-secondary);
  margin-top: var(--space-6);
  margin-bottom: var(--space-1);
}

.check-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-sm);
  line-height: var(--leading-snug);
  cursor: pointer;
}

.check-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 1px;
  accent-color: var(--color-ink);
  cursor: pointer;
}

.check-item small {
  color: var(--color-ink-tertiary);
  font-size: var(--text-xs);
}

/* ==========================================================================
   Preview Pane
   ========================================================================== */

.preview-pane {
  display: flex;
  flex-direction: column;
  background-color: var(--color-dark-bg);
  color: var(--color-dark-ink);
  border-radius: var(--radius-md);
  overflow: hidden;
  max-height: calc(100vh - 6rem);
}

@media (max-width: 1023px) {
  .preview-pane {
    max-height: 60vh;
  }
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-dark-surface);
  border-bottom: 1px solid var(--color-dark-border);
  flex-shrink: 0;
}

.preview-filename {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-dark-ink-secondary);
}

.preview-actions {
  display: flex;
  gap: var(--space-2);
}

.preview-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  color: var(--color-dark-ink-secondary);
  background: transparent;
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--duration) var(--ease-out),
              border-color var(--duration) var(--ease-out),
              background-color var(--duration) var(--ease-out);
}

.preview-btn:hover {
  color: var(--color-dark-ink);
  border-color: var(--color-dark-ink-secondary);
}

.preview-btn--primary {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

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

.preview-btn svg {
  width: 14px;
  height: 14px;
}

.preview-btn--copied {
  color: var(--color-accent) !important;
  border-color: var(--color-accent) !important;
}

.preview-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
  scrollbar-width: thin;
  scrollbar-color: var(--color-dark-border) transparent;
}

.preview-body::-webkit-scrollbar {
  width: 6px;
}

.preview-body::-webkit-scrollbar-track {
  background: transparent;
}

.preview-body::-webkit-scrollbar-thumb {
  background-color: var(--color-dark-border);
  border-radius: 3px;
}

.preview-body pre {
  background: none;
  padding: 0;
  margin: 0;
  border-radius: 0;
}

.preview-body code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-dark-ink);
  background: none;
  padding: 0;
  white-space: pre-wrap;
  word-break: break-word;
}