/* Shared UI — Linear dark theme (see DESIGN.md) */

/* ── Nav ── */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface-void);
  border-bottom: 0.5px solid var(--color-graphite);
}

.site-nav__inner {
  display: flex;
  align-items: center;
  gap: var(--spacing-24);
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: var(--spacing-16) var(--spacing-24);
}

.site-nav__brand {
  font-size: 16px;
  font-weight: var(--font-weight-w510);
  color: var(--color-paper);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.site-nav__links {
  display: flex;
  flex: 1;
  gap: var(--spacing-8);
}

.site-nav__links a {
  padding: var(--spacing-8) var(--spacing-12);
  font-size: var(--text-caption);
  font-weight: var(--font-weight-regular);
  color: var(--color-mist);
  text-decoration: none;
  letter-spacing: -0.01em;
  border-radius: var(--radius-buttons);
  transition: color 0.15s;
}

.site-nav__links a:hover {
  color: var(--color-paper);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.site-nav__links a.is-active {
  color: var(--color-paper);
}

.site-nav__cta {
  margin-left: auto;
  white-space: nowrap;
}

@media (max-width: 640px) {
  .site-nav__links {
    display: none;
  }
}

/* ── Buttons ── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  font-family: var(--font-inter-variable);
  font-size: 14px;
  font-weight: var(--font-weight-w510);
  letter-spacing: -0.011em;
  line-height: 1.4;
  border: none;
  border-radius: var(--radius-buttons);
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.15s;
  font-feature-settings: 'cv01' on, 'ss03' on, 'zero' on;
}

.btn:hover {
  opacity: 0.88;
}

.btn-primary {
  background: var(--color-acid-lime);
  color: var(--color-void);
  box-shadow:
    rgba(0, 0, 0, 0.01) 0px 5px 2px 0px,
    rgba(0, 0, 0, 0.04) 0px 3px 2px 0px,
    rgba(0, 0, 0, 0.07) 0px 1px 1px 0px;
}

.btn-ghost {
  padding: 8px 12px;
  font-size: var(--text-caption);
  font-weight: var(--font-weight-regular);
  background: transparent;
  color: var(--color-mist);
  border: 1px solid var(--color-graphite);
}

.btn-signup {
  padding: 8px 16px;
  font-size: var(--text-caption);
  font-weight: var(--font-weight-w510);
  background: var(--color-paper);
  color: var(--color-void);
  border-radius: var(--radius-pills);
}

.btn-danger {
  padding: 8px 12px;
  font-size: var(--text-caption);
  font-weight: var(--font-weight-regular);
  background: rgba(235, 87, 87, 0.12);
  color: var(--color-coral-red);
  border: 1px solid rgba(235, 87, 87, 0.35);
}

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}

.link-inline {
  font-size: var(--text-caption);
  color: var(--color-mist);
  text-decoration: none;
}

.link-inline:hover {
  color: var(--color-paper);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ── Footer ── */

.site-footer {
  padding: var(--spacing-48) var(--spacing-24);
  text-align: center;
  border-top: 0.5px solid var(--color-graphite);
}

.site-footer p {
  margin: 0;
  font-size: var(--text-caption);
  color: var(--color-fog);
}

/* ── Page layout ── */

.page-wrap {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-24) var(--spacing-96);
}

.page-hero {
  position: relative;
  padding: var(--spacing-64) 0 var(--spacing-96);
}

.page-hero::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 120px;
  background: linear-gradient(to bottom, transparent, rgba(208, 214, 224, 0.04));
  pointer-events: none;
}

.page-hero__content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.page-hero__title {
  margin: 0 0 var(--spacing-16);
  font-size: var(--text-display);
  line-height: var(--leading-display);
  letter-spacing: var(--tracking-display);
}

.page-hero__subtitle {
  margin: 0 0 var(--spacing-32);
  max-width: 36em;
  font-size: var(--text-body);
  color: var(--color-fog);
  line-height: var(--leading-body);
}

.page-hero__link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-8);
  font-size: var(--text-body-sm);
  color: var(--color-mist);
  text-decoration: none;
}

.page-hero__link:hover {
  color: var(--color-paper);
}

.section-label {
  margin: 0 0 var(--spacing-16);
  font-size: 12px;
  font-weight: var(--font-weight-w510);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-fog);
}

.page-section {
  margin-bottom: var(--section-gap);
}

/* ── Cards ── */

.card-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-12);
}

@media (max-width: 640px) {
  .card-grid {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  display: flex;
  flex-direction: column;
  gap: var(--element-gap);
  padding: var(--card-padding);
  background: var(--surface-carbon);
  border-radius: var(--radius-cards);
  box-shadow: var(--shadow-subtle);
  color: inherit;
  text-decoration: none;
  transition: box-shadow 0.15s;
  position: relative;
  min-height: 100%;
}

a.feature-card:hover {
  box-shadow:
    var(--shadow-subtle),
    0 0 0 1px var(--color-smoke);
}

.feature-card__icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  border-radius: var(--radius-buttons);
  background: rgba(255, 255, 255, 0.05);
}

.feature-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-8);
}

.feature-card__title {
  margin: 0;
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-w510);
  letter-spacing: var(--tracking-subheading);
  color: var(--color-paper);
}

.feature-card__desc {
  margin: 0;
  flex: 1;
  font-size: var(--text-body-sm);
  line-height: var(--leading-body-sm);
  color: var(--color-fog);
}

.feature-card__link {
  margin-top: auto;
  padding-top: var(--spacing-8);
  font-size: var(--text-caption);
  color: var(--color-mist);
}

a.feature-card:hover .feature-card__link {
  color: var(--color-paper);
}

.feature-card__badge {
  position: absolute;
  top: var(--spacing-16);
  right: var(--spacing-16);
  padding: 0 6px;
  font-size: 12px;
  font-weight: var(--font-weight-regular);
  color: var(--color-fog);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-badges);
}

.tag-pill {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: var(--font-weight-regular);
  border-radius: var(--radius-pills);
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-mist);
}

.tag-pill--violet {
  background: rgba(99, 102, 241, 0.18);
  color: var(--color-iris-violet);
}

.tag-pill--teal {
  background: rgba(2, 184, 204, 0.15);
  color: var(--color-signal-teal);
}

.tag-pill--green {
  background: rgba(39, 166, 68, 0.15);
  color: var(--color-pulse-green);
}

/* ── Panels & forms ── */

.page-header {
  padding: var(--spacing-48) 0 var(--spacing-32);
  text-align: center;
}

.page-header__title {
  margin: 0 0 var(--spacing-12);
  font-size: var(--text-heading-lg);
  line-height: var(--leading-heading-lg);
  letter-spacing: var(--tracking-heading-lg);
}

.page-header__subtitle {
  margin: 0;
  font-size: var(--text-body-sm);
  color: var(--color-fog);
}

.panel {
  padding: var(--card-padding);
  margin-bottom: var(--spacing-16);
  background: var(--surface-carbon);
  border-radius: var(--radius-cards);
  box-shadow: var(--shadow-subtle);
}

.panel h2 {
  margin: 0 0 var(--spacing-16);
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-w510);
  letter-spacing: var(--tracking-subheading);
  color: var(--color-paper);
}

.panel--subtle {
  background: rgba(255, 255, 255, 0.02);
  box-shadow: var(--shadow-sm);
}

.form {
  display: grid;
  gap: var(--spacing-16);
}

.form label {
  display: grid;
  gap: var(--spacing-8);
  font-size: var(--text-caption);
  font-weight: var(--font-weight-regular);
  color: var(--color-fog);
}

.form input,
.form textarea,
.form select {
  font: inherit;
  padding: 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-buttons);
  background: rgba(255, 255, 255, 0.02);
  color: var(--color-mist);
}

.form input:focus,
.form textarea:focus,
.form select:focus {
  outline: none;
  border-color: var(--color-mist);
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-8);
}

.result {
  margin: var(--spacing-16) 0 0;
  padding: var(--spacing-16);
  background: var(--surface-obsidian);
  color: var(--color-mist);
  border-radius: var(--radius-buttons);
  font-size: 12px;
  font-family: var(--font-berkeley-mono);
  overflow-x: auto;
  min-height: 3rem;
  box-shadow: var(--shadow-subtle);
}

.notes-list {
  list-style: none;
  margin: var(--spacing-16) 0 0;
  padding: 0;
  display: grid;
  gap: var(--spacing-8);
}

.note-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-12);
  padding: var(--spacing-16);
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-buttons);
  box-shadow: var(--shadow-subtle);
}

.note-item p {
  margin: 0.25rem 0;
  color: var(--color-fog);
}

.note-item small {
  color: var(--color-ash);
  font-size: 12px;
}

.hint ol {
  margin: 0;
  padding-left: 1.25rem;
  font-size: var(--text-body-sm);
  line-height: var(--leading-body-sm);
  color: var(--color-fog);
}

.hint code {
  background: rgba(255, 255, 255, 0.05);
  padding: 0.1rem 0.35rem;
  border-radius: var(--radius-badges);
}

/* ── Toolbar & split layout ── */

.page-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-12);
  padding: var(--spacing-16) var(--spacing-24);
  background: var(--surface-carbon);
  border-bottom: 0.5px solid var(--color-graphite);
}

.page-toolbar__title {
  margin: 0;
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-w510);
  letter-spacing: var(--tracking-subheading);
  color: var(--color-paper);
}

.toolbar-field {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
  font-size: 12px;
  font-weight: var(--font-weight-regular);
  color: var(--color-fog);
}

.toolbar-field input,
.toolbar-field select {
  font: inherit;
  padding: 8px 12px;
  border: 1px solid var(--color-graphite);
  border-radius: var(--radius-buttons);
  background: rgba(255, 255, 255, 0.02);
  color: var(--color-mist);
}

.toolbar-field input:focus,
.toolbar-field select:focus {
  outline: none;
  border-color: var(--color-smoke);
}

.toolbar-field input[type='number'] {
  width: 52px;
}

.toolbar-field input[type='search'] {
  min-width: 160px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.ft-focus-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: var(--font-weight-regular);
  color: var(--color-acid-lime);
  background: rgba(228, 242, 34, 0.08);
  border-radius: var(--radius-pills);
  white-space: nowrap;
}

.split-layout {
  display: flex;
  min-height: calc(100vh - 57px);
}

.split-layout__main {
  flex: 1;
  min-width: 0;
  background: var(--surface-void);
}

.split-layout__aside {
  width: 320px;
  flex-shrink: 0;
  padding: var(--card-padding);
  overflow-y: auto;
  background: var(--surface-carbon);
  box-shadow: var(--shadow-subtle);
}

.ft-panel-sheet-head {
  display: none;
}

.ft-panel-backdrop {
  display: none;
}

@media (max-width: 1024px), (pointer: coarse) {
  .page-toolbar {
    position: sticky;
    top: 0;
    z-index: 90;
  }

  .split-layout {
    flex-direction: column;
    min-height: 0;
  }

  .split-layout__aside {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 200;
    width: 100%;
    max-height: 85vh;
    padding: 0 var(--spacing-24) var(--spacing-24);
    overflow-y: auto;
    border-radius: var(--radius-cards) var(--radius-cards) 0 0;
    box-shadow: var(--shadow-xl);
    transform: translateY(100%);
    transition: transform 0.28s ease;
  }

  .split-layout__aside.ft-panel--open {
    transform: translateY(0);
  }

  .ft-panel-sheet-head {
    display: flex;
    align-items: center;
    justify-content: center;
    position: sticky;
    top: 0;
    z-index: 1;
    padding: var(--spacing-12) 0 var(--spacing-8);
    margin-bottom: var(--spacing-8);
    background: var(--surface-carbon);
  }

  .ft-panel-handle {
    width: 40px;
    height: 4px;
    border-radius: var(--radius-small);
    background: var(--color-graphite);
  }

  .ft-panel-close {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    padding: 0;
    font-size: 1.25rem;
    line-height: 1;
    border: 1px solid var(--color-graphite);
    border-radius: 50%;
    background: var(--surface-obsidian);
    color: var(--color-mist);
    cursor: pointer;
  }

  .ft-panel-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 150;
    background: rgba(8, 9, 10, 0.72);
  }

  .ft-panel-backdrop[hidden] {
    display: none !important;
  }

  .split-layout__aside:not(.ft-panel--open) .panel-empty {
    display: none;
  }
}

/* ── Dialog ── */

.dialog {
  border: none;
  border-radius: var(--radius-cards);
  padding: 0;
  background: var(--surface-carbon);
  color: var(--color-mist);
  max-width: 400px;
  width: calc(100% - 32px);
  box-shadow: var(--shadow-xl);
}

.dialog::backdrop {
  background: rgba(8, 9, 10, 0.72);
}

.dialog .form {
  padding: var(--spacing-32);
}

.dialog h2 {
  margin: 0 0 var(--spacing-16);
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-w510);
  color: var(--color-paper);
}

.form-msg {
  margin: 0;
  font-size: 12px;
  min-height: 1.2em;
}

.form-msg--error {
  color: var(--color-coral-red);
}

.form-msg--ok {
  color: var(--color-pulse-green);
}

.empty-state[hidden] {
  display: none !important;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-16);
  padding: var(--spacing-96);
  color: var(--color-fog);
  text-align: center;
}

.ft-canvas-wrap .empty-state {
  position: absolute;
  inset: 0;
  z-index: 10;
  padding: var(--spacing-24);
  background: var(--surface-void);
}

.relations-fieldset {
  margin: 0;
  padding: var(--spacing-16);
  border: 1px solid var(--color-graphite);
  border-radius: var(--radius-buttons);
  background: rgba(255, 255, 255, 0.02);
}

.relations-fieldset legend {
  padding: 0 6px;
  font-size: 12px;
  font-weight: var(--font-weight-regular);
  color: var(--color-fog);
}

.panel-empty {
  color: var(--color-fog);
  font-size: var(--text-caption);
  text-align: center;
  padding-top: var(--spacing-48);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-16);
}

.panel-header h2 {
  margin: 0;
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-w510);
}