/*
 * Nightfall Compress
 * Uses the Nightfall OS design tokens (Nord palette).
 */

:root {
  /* Nord palette */
  --nord0: #2e3440;
  --nord1: #3b4252;
  --nord2: #434c5e;
  --nord3: #4c566a;
  --nord4: #d8dee9;
  --nord5: #e5e9f0;
  --nord6: #eceff4;
  --nord7: #8fbcbb;
  --nord8: #88c0d0;
  --nord9: #81a1c1;
  --nord10: #5e81ac;
  --nord11: #bf616a;
  --nord12: #d08770;
  --nord13: #ebcb8b;
  --nord14: #a3be8c;
  --nord15: #b48ead;

  /* Semantic tokens */
  --background: var(--nord0);
  --surface: var(--nord1);
  --surface-elevated: var(--nord2);
  --surface-sunken: #272c36;
  --border: var(--nord3);
  --text-primary: var(--nord6);
  --text-secondary: var(--nord4);
  --text-muted: #a7b1c2;
  --primary: var(--nord9);
  --primary-hover: var(--nord8);
  --primary-foreground: var(--nord0);
  --brand: var(--nord14);
  --success: var(--nord14);
  --danger: var(--nord11);
  --focus-ring: var(--nord8);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-md: 0 4px 12px rgb(0 0 0 / 25%);
  --shadow-lg: 0 10px 30px rgb(0 0 0 / 30%);
  --font: inter, -apple-system, blinkmacsystemfont, "Segoe UI", roboto, arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", menlo, consolas, monospace;

  color-scheme: dark;
}

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

html {
  background: var(--background);
}

body {
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, #3b4556 0%, transparent 70%),
    var(--background);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.5;
  margin: 0;
  min-height: 100vh;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

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

code {
  background: var(--surface-sunken);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 0.1em 0.35em;
}

img {
  display: block;
  height: auto;
  max-width: 100%;
}

[hidden] {
  display: none !important;
}

.sr-only {
  border: 0;
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

.container {
  margin: 0 auto;
  padding: 0 16px;
  width: min(1200px, 100%);
}

/* Header */

.site-header {
  backdrop-filter: blur(8px);
  background: rgb(46 52 64 / 85%);
  border-bottom: 1px solid var(--surface-elevated);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header .container {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
  min-height: 64px;
}

.brand {
  align-items: center;
  color: var(--text-primary);
  display: flex;
  font-weight: 700;
  gap: 10px;
  letter-spacing: -0.01em;
}

.brand:hover {
  color: var(--text-primary);
  text-decoration: none;
}

.brand img {
  height: 32px;
  width: 32px;
}

.brand span {
  color: var(--brand);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.site-nav a {
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.9375rem;
  padding: 6px 12px;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: var(--surface);
  color: var(--text-primary);
  text-decoration: none;
}

/* Hero */

.hero {
  padding: 56px 0 32px;
}

.eyebrow {
  color: var(--brand);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin: 0 0 12px;
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 0 0 16px;
  max-width: 24ch;
}

.hero h1 em {
  color: var(--primary-hover);
  font-style: normal;
}

.lead {
  color: var(--text-secondary);
  font-size: 1.125rem;
  margin: 0;
  max-width: 60ch;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.badge {
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--surface-elevated);
  border-radius: 999px;
  color: var(--text-secondary);
  display: inline-flex;
  font-size: 0.8125rem;
  gap: 6px;
  padding: 4px 12px;
}

.badge::before {
  background: var(--brand);
  border-radius: 50%;
  content: "";
  height: 6px;
  width: 6px;
}

/* Panels */

.panel {
  background: var(--surface);
  border: 1px solid var(--surface-elevated);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.panel-header {
  align-items: center;
  border-bottom: 1px solid var(--surface-elevated);
  display: flex;
  gap: 12px;
  justify-content: space-between;
  min-height: 56px;
  padding: 10px 20px;
}

.panel-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
}

.panel-title small {
  color: var(--text-muted);
  font-weight: 400;
  margin-left: 6px;
}

.panel-body {
  padding: 20px;
}

/* Playground layout */

.playground {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(0, 1fr);
  padding-bottom: 48px;
}

/* On narrow screens, show the image before the options. */
.options {
  order: 1;
}

@media (width >= 960px) {
  .playground {
    align-items: start;
    grid-template-columns: 320px minmax(0, 1fr);
  }

  .options {
    order: 0;
    position: sticky;
    top: 88px;
  }
}

.workspace {
  container-type: inline-size;
  display: grid;
  gap: 24px;
  min-width: 0;
}

/* Drop zone */

.dropzone {
  align-items: center;
  background: var(--surface-sunken);
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 6px;
  justify-content: center;
  padding: 32px 16px;
  text-align: center;
  transition: border-color 0.15s, background-color 0.15s;
}

.dropzone:hover,
.dropzone.is-dragging {
  background: rgb(129 161 193 / 8%);
  border-color: var(--primary);
}

.dropzone:focus-within {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.dropzone strong {
  color: var(--text-primary);
  font-size: 1.0625rem;
}

.dropzone .link {
  color: var(--primary);
  text-decoration: underline;
}

.dropzone .hint {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Options form */

.field {
  align-content: start;
  display: grid;
  gap: 6px;
  margin-bottom: 16px;
}

.field:last-child {
  margin-bottom: 0;
}

.field-row {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr 1fr;
  margin-bottom: 16px;
}

.field-row .field {
  margin-bottom: 0;
}

.field label,
.field .label {
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.field output {
  color: var(--primary-hover);
  float: right;
  font-family: var(--font-mono);
}

.input {
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font: inherit;
  font-size: 0.9375rem;
  min-height: 38px;
  padding: 6px 10px;
  width: 100%;
}

.input::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

.input:hover {
  border-color: var(--nord9);
}

.input:focus {
  border-color: var(--primary);
  outline: 2px solid rgb(136 192 208 / 35%);
  outline-offset: 0;
}

select.input {
  cursor: pointer;
}

input[type="range"] {
  accent-color: var(--primary);
  margin: 4px 0 0;
  width: 100%;
}

.toggles {
  display: grid;
  gap: 10px;
  margin-bottom: 20px;
}

.toggle {
  align-items: center;
  cursor: pointer;
  display: flex;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  gap: 10px;
}

.toggle input {
  accent-color: var(--brand);
  height: 16px;
  margin: 0;
  width: 16px;
}

.effects {
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr 1fr;
}

.effect {
  align-items: center;
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  gap: 8px;
  justify-content: center;
  min-height: 38px;
  padding: 6px 10px;
}

.effect::before {
  border: 1.5px solid currentcolor;
  border-radius: 50%;
  content: "";
  height: 10px;
  width: 10px;
}

.effect:hover {
  border-color: var(--nord9);
  color: var(--text-primary);
}

.effect[aria-pressed="true"] {
  background: rgb(163 190 140 / 15%);
  border-color: var(--brand);
  color: var(--brand);
}

.effect[aria-pressed="true"]::before {
  background: var(--brand);
  border-color: var(--brand);
}

/* The Nord button spans the row and shows the palette it converts to. */
.effect-nord {
  grid-column: 1 / -1;
}

.effect-nord::before {
  background: linear-gradient(90deg, var(--nord7) 0 25%, var(--nord8) 0 50%, var(--nord9) 0 75%, var(--nord10) 0);
  border: 0;
  border-radius: 999px;
  width: 32px;
}

.effect-nord[aria-pressed="true"] {
  background: rgb(136 192 208 / 15%);
  border-color: var(--nord8);
  color: var(--nord8);
}

.effect-nord[aria-pressed="true"]::before {
  background: linear-gradient(90deg, var(--nord7) 0 25%, var(--nord8) 0 50%, var(--nord9) 0 75%, var(--nord10) 0);
}

.divider {
  border: 0;
  border-top: 1px solid var(--surface-elevated);
  margin: 20px 0;
}

/* Buttons */

.button {
  align-items: center;
  background: var(--primary);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--primary-foreground);
  cursor: pointer;
  display: inline-flex;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  gap: 6px;
  padding: 6px 14px;
}

.button:hover {
  background: var(--primary-hover);
  color: var(--primary-foreground);
  text-decoration: none;
}

.button-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-secondary);
}

.button-ghost:hover {
  background: var(--surface-elevated);
  color: var(--text-primary);
}

.button-download {
  background: var(--brand);
  box-shadow: 0 0 0 3px rgb(163 190 140 / 20%);
  color: var(--nord0);
  flex-shrink: 0;
}

.button-download:hover {
  background: #b5cf9e;
  color: var(--nord0);
}

.button[aria-disabled="true"] {
  opacity: 0.4;
  pointer-events: none;
}

/* Result cards */

.results {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(0, 1fr);
}

@container (width >= 640px) {
  .results {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.preview {
  align-items: center;
  aspect-ratio: 4 / 3;
  background:
    repeating-conic-gradient(#323845 0% 25%, #2b303b 0% 50%) 50% / 20px 20px;
  border-radius: var(--radius-md);
  display: flex;
  justify-content: center;
  margin-bottom: 16px;
  overflow: hidden;
}

.preview img {
  max-height: 100%;
  object-fit: contain;
}

.preview .placeholder {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.meta {
  display: grid;
  font-size: 0.875rem;
  gap: 6px 12px;
  grid-template-columns: auto minmax(0, 1fr);
  margin: 0;
}

.meta dt {
  color: var(--text-muted);
}

.meta dd {
  font-family: var(--font-mono);
  margin: 0;
  overflow: hidden;
  text-align: right;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Savings */

.savings {
  align-items: center;
  display: grid;
  gap: 8px 24px;
  grid-template-columns: minmax(0, 1fr);
}

@container (width >= 480px) {
  .savings {
    grid-template-columns: auto minmax(0, 1fr);
  }
}

.savings-figure {
  font-size: 2.5rem;
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
}

.savings-figure.is-good {
  color: var(--success);
}

.savings-figure.is-bad {
  color: var(--danger);
}

.savings-detail {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

.meter {
  background: var(--surface-sunken);
  border-radius: 999px;
  height: 8px;
  margin-top: 10px;
  overflow: hidden;
}

.meter span {
  background: linear-gradient(90deg, var(--nord10), var(--nord8));
  border-radius: inherit;
  display: block;
  height: 100%;
  transition: width 0.3s ease;
  width: 0;
}

.status {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin: 0;
  min-height: 1.5em;
}

.status.is-error {
  color: var(--danger);
}

/* Compare slider */

.compare {
  --position: 50%;

  aspect-ratio: 16 / 9;
  background:
    repeating-conic-gradient(#323845 0% 25%, #2b303b 0% 50%) 50% / 20px 20px;
  border-radius: var(--radius-md);
  max-height: 70vh;
  overflow: hidden;
  position: relative;
  user-select: none;
  width: 100%;
}

/* Both images are fitted into the same box so they line up exactly. */
.compare img,
.compare-after {
  height: 100%;
  inset: 0;
  position: absolute;
  width: 100%;
}

.compare img {
  object-fit: contain;
}

.compare-after {
  clip-path: inset(0 0 0 var(--position));
}

.compare-handle {
  background: var(--nord6);
  bottom: 0;
  box-shadow: 0 0 0 1px rgb(0 0 0 / 30%);
  left: var(--position);
  pointer-events: none;
  position: absolute;
  top: 0;
  transform: translateX(-1px);
  width: 2px;
}

.compare-handle::after {
  background: var(--nord6);
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  color: var(--nord0);
  content: "⟷";
  display: grid;
  font-size: 1rem;
  font-weight: 700;
  height: 36px;
  left: 50%;
  place-items: center;
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 36px;
}

.compare-label {
  background: rgb(46 52 64 / 80%);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  pointer-events: none;
  position: absolute;
  top: 12px;
}

.compare-label.is-before {
  left: 12px;
}

.compare-label.is-after {
  right: 12px;
}

.compare input[type="range"] {
  cursor: ew-resize;
  height: 100%;
  inset: 0;
  margin: 0;
  opacity: 0;
  position: absolute;
  width: 100%;
}

.compare:has(input:focus-visible) {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--surface-elevated);
  color: var(--text-muted);
  font-size: 0.875rem;
  padding: 24px 0 32px;
}

.site-footer .container {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: space-between;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.site-footer a {
  color: var(--text-secondary);
}

.site-footer p {
  margin: 0;
}

.site-footer .made-by {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 4px;
}

.site-footer .made-by a {
  color: var(--brand);
  font-weight: 600;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
  }
}