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

:root {
  --bg: #0f0f0f;
  --bg-elevated: #141414;
  --text: #ececec;
  --text-secondary: #8a8a8a;
  --text-tertiary: #5c5c5c;
  --border: #232323;
  --border-hover: #333333;
  --hover: #1a1a1a;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
}

button {
  font: inherit;
  color: inherit;
}

.app {
  min-height: 100vh;
}

.content-shell {
  max-width: 760px;
  margin: 0 auto;
  padding-inline: 1.5rem;
}

.header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(15, 15, 15, 0.9);
  backdrop-filter: blur(10px);
}

.header-inner {
  min-height: 48px;
  display: flex;
  align-items: center;
}

.main-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.625rem 0;
  width: 100%;
  padding: 0.625rem 0;
}

.nav-mode {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.nav-divider {
  width: 1px;
  height: 12px;
  margin-inline: 0.875rem;
  background: var(--border);
  flex-shrink: 0;
}

.nav-categories {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.625rem 1rem;
  flex: 1;
  min-width: 0;
}

.mark {
  width: 9px;
  height: 9px;
  flex-shrink: 0;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: var(--text);
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.mark:hover {
  opacity: 0.7;
}

.mark:focus-visible {
  outline: 1px solid var(--text-secondary);
  outline-offset: 4px;
}

.nav-link {
  padding: 0;
  border: none;
  background: none;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: color 0.15s ease;
}

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

.nav-link.is-active {
  font-weight: 400;
  color: var(--text-secondary);
}

.nav-mix.is-active {
  color: var(--text);
}

.nav-saved {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  margin-left: auto;
}

.saved-count {
  font-size: 12px;
  font-weight: 400;
  font-variant-numeric: tabular-nums;
  color: var(--text-tertiary);
}

.main {
  padding: 2rem 0 5rem;
}

.control-row {
  margin-bottom: 2rem;
}

.action-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.save-set-wrap {
  position: relative;
}

.action-primary {
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--text);
  border-radius: 4px;
  background: var(--text);
  font-size: 13px;
  font-weight: 400;
  color: var(--bg);
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.action-primary:hover {
  opacity: 0.88;
}

.action-secondary {
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  font-size: 13px;
  font-weight: 400;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, opacity 0.15s ease;
}

.action-secondary:hover:not(:disabled) {
  color: var(--text);
  border-color: var(--border-hover);
}

.action-secondary:disabled {
  opacity: 0.35;
  cursor: default;
}

.action-secondary.is-feedback {
  color: var(--text-tertiary);
}

.action-primary:focus-visible,
.action-secondary:focus-visible,
.nav-link:focus-visible,
.action-button:focus-visible,
.collection-summary:focus-visible {
  outline: 1px solid var(--text-secondary);
  outline-offset: 3px;
}

.prompt-list {
  display: flex;
  flex-direction: column;
}

.prompt-row {
  display: grid;
  grid-template-columns: 2rem 1fr auto;
  gap: 1rem 1.5rem;
  align-items: start;
  padding: 1.25rem 0;
}

.prompt-list > .prompt-row {
  cursor: pointer;
}

.prompt-list > .prompt-row .prompt-text {
  transition: opacity 0.15s ease;
}

@media (hover: hover) {
  .prompt-list > .prompt-row:hover .prompt-text {
    opacity: 0.6;
  }
}

.prompt-list > .prompt-row .prompt-row-feedback {
  justify-self: end;
  padding-top: 0.1rem;
  font-size: 12px;
  font-weight: 400;
  color: var(--text-tertiary);
  text-align: right;
  line-height: 1;
  pointer-events: none;
}

.prompt-list > .prompt-row .prompt-row-feedback:empty::before {
  content: "Copied";
  visibility: hidden;
}

.prompt-row + .prompt-row {
  border-top: 1px solid var(--border);
}

.prompt-index {
  padding-top: 0.1rem;
  font-size: 13px;
  font-weight: 400;
  font-variant-numeric: tabular-nums;
  color: var(--text-tertiary);
}

.prompt-text {
  margin: 0;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text);
  white-space: pre-wrap;
}

.row-actions {
  display: flex;
  gap: 0.75rem;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.prompt-row:hover .row-actions,
.saved-prompt-row:hover .row-actions,
.collection-row:hover .collection-actions {
  opacity: 1;
}

@media (hover: none) {
  .row-actions,
  .collection-actions {
    opacity: 1;
  }
}

.action-button {
  padding: 0;
  border: none;
  background: none;
  font-size: 13px;
  font-weight: 400;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color 0.15s ease;
}

.action-button:hover:not(:disabled) {
  color: var(--text);
}

.action-button.is-feedback {
  color: var(--text-tertiary);
}

.action-button:disabled {
  cursor: default;
}

.empty-state {
  margin: 0;
  font-size: 14px;
  color: var(--text-tertiary);
}

.saved-section + .saved-section {
  margin-top: 3rem;
}

.section-label {
  margin: 0 0 1rem;
  font-size: 13px;
  font-weight: 400;
  color: var(--text-tertiary);
}

.collection-row {
  padding: 0.25rem 0;
}

.collection-row + .collection-row {
  border-top: 1px solid var(--border);
}

.collection-summary {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.25rem;
  width: 100%;
  padding: 1.25rem 0 0.75rem;
  border: none;
  background: none;
  text-align: left;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.collection-summary:hover {
  opacity: 0.8;
}

.collection-title {
  font-size: 14px;
  font-weight: 400;
  color: var(--text);
}

.collection-meta {
  font-size: 13px;
  color: var(--text-tertiary);
}

.collection-actions {
  display: flex;
  gap: 0.75rem;
  padding-bottom: 1rem;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.collection-prompts {
  padding-bottom: 0.5rem;
}

.collection-prompt + .collection-prompt {
  border-top: 1px solid var(--border);
}

.collection-prompt {
  padding: 0.875rem 0;
}

.saved-prompt-row {
  padding: 1.25rem 0;
}

.saved-prompt-row + .saved-prompt-row {
  border-top: 1px solid var(--border);
}

.saved-prompt-meta {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
  font-size: 13px;
  color: var(--text-tertiary);
}

.saved-prompt-row .prompt-text {
  margin-bottom: 0.75rem;
}

@media (max-width: 640px) {
  html,
  body {
    overflow-x: hidden;
  }

  .content-shell {
    padding-inline: 1rem;
    max-width: 100%;
    min-width: 0;
  }

  .header-inner {
    min-width: 0;
  }

  .main-nav {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "mode saved"
      "categories categories";
    gap: 0.625rem 1rem;
    width: 100%;
    min-width: 0;
  }

  .nav-mode {
    grid-area: mode;
    width: auto;
  }

  .nav-divider {
    display: none;
  }

  .nav-categories {
    grid-area: categories;
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0.875rem 1rem;
    width: 100%;
    min-width: 0;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    overscroll-behavior-x: contain;
  }

  .nav-categories::-webkit-scrollbar {
    display: none;
  }

  .nav-categories .nav-link {
    flex-shrink: 0;
    white-space: nowrap;
  }

  .nav-saved {
    grid-area: saved;
    margin-left: 0;
    width: auto;
    justify-self: end;
    flex-shrink: 0;
  }

  .main {
    min-width: 0;
  }

  .action-row {
    width: 100%;
    min-width: 0;
  }

  .action-primary,
  .action-secondary {
    max-width: 100%;
  }

  .save-set-wrap {
    max-width: 100%;
  }

  .save-toast {
    width: min(300px, calc(100vw - 2rem));
    max-width: 100%;
  }

  .prompt-list {
    min-width: 0;
  }

  .prompt-row {
    grid-template-columns: 1.75rem minmax(0, 1fr);
    gap: 0.5rem 1rem;
    min-width: 0;
  }

  .prompt-list > .prompt-row {
    grid-template-columns: 1.75rem minmax(0, 1fr) auto;
  }

  .prompt-text {
    min-width: 0;
    overflow-wrap: anywhere;
  }

  .row-actions {
    grid-column: 2;
    opacity: 1;
  }
}

.save-toast {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  z-index: 20;
  width: min(300px, calc(100vw - 2rem));
  opacity: 0;
  transform: translateY(-5px);
  transition: opacity 180ms ease, transform 180ms ease;
  pointer-events: none;
}

.save-toast[hidden] {
  display: none;
}

.save-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

@media (prefers-reduced-motion: reduce) {
  .save-toast {
    transform: none;
    transition: opacity 120ms ease;
  }
}

.save-toast-inner {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border: 1px solid var(--border-hover);
  border-radius: 4px;
  background: var(--bg-elevated);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
}

.save-toast-content {
  flex: 1;
}

.save-toast-title {
  margin: 0 0 0.375rem;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
}

.save-toast-text {
  margin: 0;
  font-size: 13px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text-secondary);
}

.save-toast-close {
  padding: 0;
  border: none;
  background: none;
  font-size: 16px;
  line-height: 1;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: color 0.15s ease;
}

.save-toast-close:hover {
  color: var(--text-secondary);
}

.save-toast-close:focus-visible {
  outline: 1px solid var(--text-secondary);
  outline-offset: 2px;
}