/* ============================================================
   4TH AND BAILEY Business Journal — Global Design System
   Palette: Professional navy/slate dark, clean white light
   Typography: System stack — no external font dependency
   ============================================================ */

/* --- Design Tokens --- */
:root {
  /* Brand */
  --brand: #0072C6;          /* 4th and Bailey blue */
  --brand-light: #2E9CDB;
  --brand-dim: rgba(0, 114, 198, 0.15);
  --danger: #D93025;

  /* Dark theme (default) */
  --fg-strong: #F0F4F8;
  --fg: #C8D0DA;
  --fg-muted: #7A8796;
  --fg-visited: #556070;
  --bg: #0F1923;
  --bg-surface: #17222E;
  --bg-raised: #1E2D3D;
  --bg-hover: #243444;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --outline: #0072C6;
  --backdrop: rgba(0, 0, 0, 0.85);
  color-scheme: dark;

  /* Typography scale */
  --fs-xs:   0.625rem;   /* 10px */
  --fs-sm:   0.75rem;    /* 12px */
  --fs-md:   0.875rem;   /* 14px */
  --fs-lg:   1rem;       /* 16px */
  --fs-xl:   1.125rem;   /* 18px */
  --fs-body: var(--fs-md);

  /* Spacing */
  --sp-xxs: 0.25rem;
  --sp-xs:  0.375rem;
  --sp-sm:  0.5rem;
  --sp-md:  0.75rem;
  --sp-lg:  1rem;
  --sp-xl:  1.5rem;
  --sp-2xl: 2rem;
  --sp-3xl: 3rem;

  /* Layout */
  --header-h: 52px;
  --col-min:  340px;
  --col-max:  440px;
  --row-h:    680px;
  --content-x: var(--sp-lg);

  /* Borders */
  --br-sm: 0.25rem;
  --br-md: 0.5rem;
  --br-lg: 0.75rem;
  --br-full: 9999px;

  /* Z-index layers */
  --z-skip:   40;
  --z-header: 30;
  --z-dialog: 20;
  --z-toast:  10;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 120ms;
  --duration-md:   220ms;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5), 0 2px 4px rgba(0,0,0,0.3);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.6);
}

/* Light theme via system preference */
@media (prefers-color-scheme: light) {
  :root {
    --fg-strong: #0A1929;
    --fg: #1E3A52;
    --fg-muted: #5C7A96;
    --fg-visited: #8A9FB5;
    --bg: #F0F4F8;
    --bg-surface: #FFFFFF;
    --bg-raised: #E8EEF5;
    --bg-hover: #DDE5EF;
    --border: rgba(0, 0, 0, 0.08);
    --border-strong: rgba(0, 0, 0, 0.16);
    --outline: #0072C6;
    --backdrop: rgba(0, 0, 0, 0.6);
    color-scheme: light;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12), 0 2px 4px rgba(0,0,0,0.08);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.2);
  }
}

/* Large text preference */
[data-size="large"] {
  --fs-body: var(--fs-lg);
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
}

html {
  height: 100%;
  font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue',
    Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  min-height: 100%;
  background-color: var(--bg);
  color: var(--fg);
  font-size: var(--fs-body);
  line-height: 1.5;
  overflow-x: hidden;
}

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

a {
  color: var(--fg);
  text-decoration: none;
  transition: color var(--duration-fast) ease;
}

a:hover, a:focus-visible {
  color: var(--fg-strong);
}

a:visited {
  color: var(--fg-visited);
}

a:focus-visible {
  outline: 2px solid var(--outline);
  outline-offset: 2px;
  border-radius: var(--br-sm);
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.25;
  overflow-wrap: break-word;
}

button, input, select, textarea {
  font: inherit;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* --- Skip Link --- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: var(--z-skip);
  padding: var(--sp-sm) var(--sp-lg);
  background: var(--brand);
  color: #fff;
  font-weight: 700;
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-radius: 0 0 var(--br-md) 0;
  transform: translateY(-110%);
  transition: transform var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  transform: translateY(0);
  outline: 2px solid #fff;
  outline-offset: -4px;
}

/* --- Utility --- */
.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;
}

.clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* --- Buttons --- */
.btn {
  all: unset;
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: var(--fs-sm);
  font-weight: 600;
  line-height: 1;
  color: var(--fg);
  border-radius: var(--br-sm);
  padding: var(--sp-xs) var(--sp-sm);
  text-align: center;
  user-select: none;
  transition:
    background-color var(--duration-fast) ease,
    color var(--duration-fast) ease,
    opacity var(--duration-fast) ease;
}

.btn:hover {
  background-color: var(--bg-hover);
  color: var(--fg-strong);
}

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

.btn:active {
  background-color: var(--bg-raised);
}

.btn[disabled] {
  opacity: 0.4;
  pointer-events: none;
}

.btn-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--br-full);
  padding: 0;
  flex-shrink: 0;
}

.btn-icon:hover {
  background-color: var(--brand-dim);
  color: var(--brand-light);
}

.btn-icon svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
  pointer-events: none;
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding-inline: var(--content-x);
  gap: var(--sp-md);
  transition:
    background-color var(--duration-md) var(--ease-in-out),
    border-color var(--duration-md) var(--ease-in-out);
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  color: var(--fg-strong);
  font-weight: 700;
  font-size: var(--fs-sm);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.site-header__brand-mark {
  display: flex;
  align-items: center;
  gap: var(--sp-xs);
}

.site-header__brand-mark svg {
  width: 20px;
  height: 20px;
  fill: var(--brand);
  flex-shrink: 0;
}

.site-header__divider {
  width: 1px;
  height: 16px;
  background: var(--border-strong);
  flex-shrink: 0;
}

.site-header__sub {
  font-size: var(--fs-xs);
  font-weight: 500;
  color: var(--fg-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.site-header__controls {
  display: flex;
  align-items: center;
  gap: var(--sp-xs);
}

/* --- Main Content --- */
.site-main {
  padding-block-start: var(--sp-xl);
  padding-block-end: var(--sp-3xl);
  padding-inline: var(--content-x);
  min-height: calc(100vh - var(--header-h));
}

/* --- Feed Grid --- */
.feed-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-xl);
}

@media (min-width: 720px) {
  .feed-grid {
    grid-template-columns: repeat(auto-fill, minmax(var(--col-min), 1fr));
    gap: var(--sp-lg);
  }
}

@media (min-width: 1200px) {
  .feed-grid {
    grid-auto-rows: var(--row-h);
    gap: var(--sp-xl) var(--sp-lg);
  }
}

@media (min-width: 1600px) {
  :root { --content-x: var(--sp-2xl); }
}

/* --- Feed Card --- */
.feed-card {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: var(--sp-xs);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--br-lg);
  overflow: hidden;
  max-height: var(--row-h);
  transition: border-color var(--duration-fast) ease;
}

.feed-card:hover {
  border-color: var(--border-strong);
}

/* Pinned feed — subtle brand accent */
.feed-card--pinned {
  border-color: var(--brand);
  border-width: 1px;
}

.feed-card--pinned .feed-card__header {
  background: linear-gradient(135deg, var(--brand-dim) 0%, transparent 100%);
}

/* Expanded via Show More */
.feed-card--expanded {
  grid-row: span 2;
  max-height: none;
}

/* Error / limited state */
.feed-card--error .feed-card__body,
.feed-card--limited .feed-card__body {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-xl);
  color: var(--fg-muted);
  font-size: var(--fs-sm);
  text-align: center;
}

/* --- Feed Card Header --- */
.feed-card__header {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  padding: var(--sp-sm) var(--sp-md);
  border-bottom: 1px solid var(--border);
}

.feed-card__favicon {
  width: 16px;
  height: 16px;
  border-radius: var(--br-sm);
  flex-shrink: 0;
  object-fit: contain;
}

.feed-card__favicon[hidden] {
  display: none;
}

.feed-card__source-link {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: var(--sp-xs);
}

.feed-card__source-name {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-strong);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  transition: color var(--duration-fast) ease;
}

.feed-card__source-link:hover .feed-card__source-name {
  color: var(--brand-light);
}

.feed-card__pinned-badge {
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--brand-light);
  letter-spacing: 0.04em;
  flex-shrink: 0;
}

/* --- Feed Article List --- */
.feed-card__body {
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to bottom, black 85%, transparent 100%);
  mask-image: linear-gradient(to bottom, black 85%, transparent 100%);
}

.feed-card--expanded .feed-card__body {
  -webkit-mask-image: none;
  mask-image: none;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.feed-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.feed-list__item {
  border-top: 1px solid var(--border);
  transition: background-color var(--duration-fast) ease;
}

.feed-list__item:first-child {
  border-top: none;
}

.feed-list__item:hover {
  background-color: var(--bg-hover);
}

.feed-list__row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: stretch;
}

.feed-article-link {
  display: block;
  padding: var(--sp-sm) var(--sp-md);
  color: var(--fg);
  line-height: 1.4;
  font-size: var(--fs-body);
  transition: color var(--duration-fast) ease;
}

.feed-article-link:hover,
.feed-article-link:focus-visible {
  color: var(--fg-strong);
}

.feed-article-link:visited {
  color: var(--fg-visited);
}

.feed-article-link:focus-visible {
  background-color: var(--bg-hover);
  outline-offset: -2px;
}

.feed-comments-link {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-xs) var(--sp-sm);
  color: var(--fg-muted);
  border-left: 1px solid var(--border);
  transition: color var(--duration-fast) ease, background-color var(--duration-fast) ease;
  min-width: 36px;
}

.feed-comments-link:hover {
  color: var(--brand-light);
  background-color: var(--brand-dim);
}

.feed-comments-link:focus-visible {
  outline: 2px solid var(--outline);
  outline-offset: -2px;
}

.feed-comments-link svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
  flex-shrink: 0;
}

/* --- Show More / Less Button --- */
.feed-card__footer {
  padding: var(--sp-xs) var(--sp-md);
  border-top: 1px solid var(--border);
}

.show-more-btn {
  all: unset;
  box-sizing: border-box;
  display: block;
  width: 100%;
  padding: var(--sp-xs) 0;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: center;
  color: var(--fg-muted);
  cursor: pointer;
  border-radius: var(--br-sm);
  transition: color var(--duration-fast) ease, background-color var(--duration-fast) ease;
}

.show-more-btn:hover {
  color: var(--brand-light);
  background-color: var(--brand-dim);
}

.show-more-btn:focus-visible {
  outline: 2px solid var(--outline);
  outline-offset: 2px;
}

/* --- Settings Dialog --- */
.settings-dialog {
  position: fixed;
  inset: 0;
  z-index: var(--z-dialog);
  display: none;
  align-items: flex-start;
  justify-content: flex-end;
  padding: calc(var(--header-h) + var(--sp-sm)) var(--sp-lg) var(--sp-lg);
}

.settings-dialog[aria-hidden="false"] {
  display: flex;
}

.settings-dialog__backdrop {
  position: fixed;
  inset: 0;
  background: var(--backdrop);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  cursor: pointer;
}

.settings-dialog__panel {
  position: relative;
  z-index: 1;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--br-lg);
  box-shadow: var(--shadow-lg);
  width: min(420px, calc(100vw - 2 * var(--sp-lg)));
  max-height: calc(100vh - var(--header-h) - var(--sp-2xl));
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.settings-dialog__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-md) var(--sp-lg);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.settings-dialog__title {
  font-size: var(--fs-md);
  font-weight: 700;
  color: var(--fg-strong);
  letter-spacing: 0.02em;
}

.settings-dialog__body {
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: var(--sp-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--sp-xl);
}

.settings-section__label {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-block-end: var(--sp-sm);
}

/* Toggle row */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-md);
}

.toggle-row__label {
  font-size: var(--fs-sm);
  color: var(--fg);
}

/* Toggle switch */
.toggle {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}

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

.toggle__track {
  position: absolute;
  inset: 0;
  background: var(--bg-raised);
  border: 1px solid var(--border-strong);
  border-radius: var(--br-full);
  cursor: pointer;
  transition: background-color var(--duration-fast) ease;
}

.toggle__track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: var(--br-full);
  background: var(--fg-muted);
  transition: transform var(--duration-fast) var(--ease-out), background-color var(--duration-fast) ease;
}

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

.toggle input:checked + .toggle__track::after {
  background: #fff;
  transform: translateX(18px);
}

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

/* Feed reorder list */
.feed-reorder-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-xs);
}

.feed-reorder-item {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  padding: var(--sp-xs) var(--sp-sm);
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--br-md);
  cursor: grab;
  transition: background-color var(--duration-fast) ease, border-color var(--duration-fast) ease;
}

.feed-reorder-item:hover {
  background: var(--bg-hover);
  border-color: var(--border-strong);
}

.feed-reorder-item[aria-grabbed="true"],
.feed-reorder-item.dragging {
  opacity: 0.5;
  cursor: grabbing;
}

.feed-reorder-item[data-pinned="true"] {
  cursor: default;
  border-color: var(--brand);
}

.feed-reorder-item__drag-handle {
  color: var(--fg-muted);
  flex-shrink: 0;
  cursor: grab;
}

.feed-reorder-item__drag-handle svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.feed-reorder-item__name {
  flex: 1;
  font-size: var(--fs-sm);
  color: var(--fg);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.feed-reorder-item__pinned {
  font-size: var(--fs-xs);
  color: var(--brand-light);
  font-weight: 600;
  flex-shrink: 0;
}

.feed-reorder-item__move-btns {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}

.feed-reorder-item__move-btns .btn {
  width: 20px;
  height: 20px;
  padding: 0;
  font-size: 10px;
  border-radius: var(--br-sm);
}

.feed-reorder-item__remove {
  color: var(--fg-muted);
  transition: color var(--duration-fast) ease;
  flex-shrink: 0;
}

.feed-reorder-item__remove:hover {
  color: var(--danger);
  background: transparent;
}

/* Add custom feed form */
.add-feed-form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--sp-xxs);
}

.form-field label {
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--fg-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.form-field input {
  background: var(--bg-raised);
  border: 1px solid var(--border-strong);
  border-radius: var(--br-md);
  color: var(--fg-strong);
  font-size: var(--fs-sm);
  padding: var(--sp-xs) var(--sp-sm);
  transition: border-color var(--duration-fast) ease, background-color var(--duration-fast) ease;
  width: 100%;
}

.form-field input:hover {
  background: var(--bg-hover);
  border-color: var(--border-strong);
}

.form-field input:focus {
  outline: 2px solid var(--outline);
  outline-offset: -1px;
  background: var(--bg-raised);
}

.form-field input::placeholder {
  color: var(--fg-muted);
  opacity: 0.7;
}

.form-field__error {
  font-size: var(--fs-xs);
  color: var(--danger);
  display: none;
}

.form-field__error[aria-hidden="false"] {
  display: block;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
  font-size: var(--fs-sm);
  font-weight: 700;
  padding: var(--sp-sm) var(--sp-md);
  border-radius: var(--br-md);
  width: 100%;
  justify-content: center;
  letter-spacing: 0.02em;
}

.btn-primary:hover {
  background: var(--brand-light);
  color: #fff;
}

.btn-danger {
  background: transparent;
  color: var(--danger);
  font-size: var(--fs-sm);
  font-weight: 600;
  padding: var(--sp-xs) var(--sp-md);
  border-radius: var(--br-md);
  border: 1px solid var(--danger);
  width: 100%;
  justify-content: center;
}

.btn-danger:hover {
  background: rgba(217, 48, 37, 0.1);
  color: var(--danger);
}

/* --- Toast Notifications --- */
.toast-region {
  position: fixed;
  bottom: var(--sp-lg);
  right: var(--sp-lg);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
  pointer-events: none;
}

.toast {
  background: var(--bg-raised);
  border: 1px solid var(--border-strong);
  border-radius: var(--br-md);
  box-shadow: var(--shadow-md);
  padding: var(--sp-sm) var(--sp-md);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--fg-strong);
  letter-spacing: 0.02em;
  pointer-events: auto;
  animation: toast-in var(--duration-md) var(--ease-out) both;
}

.toast--success {
  border-color: var(--brand);
  color: var(--brand-light);
}

.toast--error {
  border-color: var(--danger);
  color: var(--danger);
}

@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--sp-xl) var(--content-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-md);
  flex-wrap: wrap;
}

.site-footer__brand {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
}

.site-footer__links {
  display: flex;
  gap: var(--sp-md);
  align-items: center;
}

.site-footer__link {
  font-size: var(--fs-xs);
  color: var(--fg-muted);
  letter-spacing: 0.04em;
}

.site-footer__link:hover {
  color: var(--fg);
}

/* Cached-at timestamp */
.feed-card__cached-at {
  font-size: var(--fs-xs);
  color: var(--fg-muted);
  padding: var(--sp-xxs) var(--sp-md);
  display: block;
  text-align: right;
}