/* Kathi: calm, professional base styles. No external fonts or assets. */

:root {
  --color-bg: #f4f6f7;
  --color-surface: #ffffff;
  --color-text: #1d2a33;
  --color-muted: #4a5a66;
  --color-border: #d3dce1;
  --color-accent: #1f5f6e;
  --color-accent-strong: #164954;
  --color-accent-soft: #e5eff1;
  --color-focus: #1f5f6e;
  --radius: 10px;
  --shadow: 0 1px 2px rgb(29 42 51 / 6%), 0 2px 8px rgb(29 42 51 / 5%);
  --content-width: 60rem;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "Noto Sans", sans-serif;
}

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

html {
  font-size: 112.5%; /* 18 px base */
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.6;
}

h1,
h2,
h3 {
  line-height: 1.25;
  margin: 0 0 0.5em;
  font-weight: 650;
}

h1 {
  font-size: 1.75rem;
}

h2 {
  font-size: 1.35rem;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--color-accent);
  text-underline-offset: 0.15em;
}

a:hover {
  color: var(--color-accent-strong);
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -10rem;
  padding: 0.5rem 1rem;
  background: var(--color-surface);
  border: 2px solid var(--color-accent);
  border-radius: var(--radius);
  z-index: 10;
}

.skip-link:focus {
  top: 1rem;
}

/* Header */

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  padding-block: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--color-text);
  text-decoration: none;
}

.brand:hover {
  color: var(--color-text);
}

.brand__mark {
  width: 2.5rem;
  height: 2.5rem;
  flex: none;
  color: var(--color-accent);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand__name {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.01em;
}

.brand__tagline {
  font-size: 0.9rem;
  color: var(--color-muted);
}

/* Main */

.site-main {
  flex: 1;
  padding-block: 2.5rem 3rem;
}

.intro {
  margin-bottom: 2rem;
}

.lead {
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 40rem;
}

.icon {
  width: 1.5rem;
  height: 1.5rem;
  flex: none;
}

/* Tool cards */

.tool-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

@media (min-width: 45rem) {
  .tool-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.tool-list > li {
  display: flex;
}

.tool-card {
  flex: 1;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem 1.35rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: var(--color-text);
  text-decoration: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.tool-card:hover {
  color: var(--color-text);
  border-color: var(--color-accent);
  box-shadow: 0 2px 4px rgb(29 42 51 / 8%), 0 6px 16px rgb(29 42 51 / 8%);
}

.tool-card__icon {
  width: 2.75rem;
  height: 2.75rem;
  padding: 0.55rem;
  border-radius: 8px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

.tool-card__body {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.tool-card__title {
  font-weight: 650;
  font-size: 1.1rem;
  color: var(--color-accent);
}

.tool-card__summary {
  color: var(--color-muted);
}

/* Empty state */

.empty-state {
  padding: 2.5rem 1.5rem;
  text-align: center;
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  color: var(--color-muted);
}

.empty-state__icon {
  width: 3rem;
  height: 3rem;
  margin-bottom: 0.75rem;
  color: var(--color-accent);
}

.empty-state__title {
  margin-bottom: 0.25rem;
  font-size: 1.15rem;
  font-weight: 650;
  color: var(--color-text);
}

.empty-state p:last-child {
  margin-bottom: 0;
}

/* Tool pages */

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

.back-link {
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

.panel {
  margin-bottom: 1.5rem;
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel > :last-child {
  margin-bottom: 0;
}

.hint {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.schema-grid {
  display: grid;
  gap: 1.25rem 2rem;
  margin-bottom: 0.75rem;
}

@media (min-width: 45rem) {
  .schema-grid {
    grid-template-columns: 290fr 420fr;
    align-items: start;
  }
}

.schema {
  margin: 0;
}

.schema-note {
  max-width: 40rem;
  margin-bottom: 1.5rem;
}

.schema svg {
  display: block;
  max-width: 100%;
  height: auto;
  margin-bottom: 0.5rem;
}

.schema figcaption {
  color: var(--color-muted);
  font-size: 0.95rem;
  max-width: 40rem;
}

.schema__page,
.schema__sheet {
  fill: var(--color-surface);
  stroke: var(--color-muted);
  stroke-width: 1.5;
}

.schema__sheet {
  fill: none;
}

.schema__cell {
  fill: var(--color-accent-soft);
}

.schema__cut {
  stroke: var(--color-text);
  stroke-width: 1.2;
  stroke-dasharray: 4 3;
}

.schema__arrow {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.schema__num {
  font: 650 22px var(--font-sans);
  fill: var(--color-accent);
  text-anchor: middle;
}

.schema__caption {
  font: 15px var(--font-sans);
  fill: var(--color-muted);
  text-anchor: middle;
}

.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  margin-bottom: 0.75rem;
  padding: 1.75rem 1rem;
  text-align: center;
  background: var(--color-bg);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.dropzone:hover,
.dropzone--active {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.dropzone--selected {
  border-style: solid;
  border-color: var(--color-accent);
}

input:focus-visible + .dropzone {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.dropzone__icon {
  width: 2.25rem;
  height: 2.25rem;
  margin-bottom: 0.35rem;
  color: var(--color-accent);
}

.dropzone__title {
  font-weight: 650;
  color: var(--color-accent);
}

.dropzone__text {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.file-list {
  margin: 0 0 0.75rem;
  padding: 0;
  list-style: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.file-list__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 0.75rem;
  padding: 0.5rem 0.5rem 0.5rem 1rem;
}

.file-list__item + .file-list__item {
  border-top: 1px solid var(--color-border);
}

.file-list__name {
  flex: 1 1 12rem;
  min-width: 0;
  font-weight: 600;
  overflow-wrap: anywhere;
}

.file-list__size {
  color: var(--color-muted);
  font-size: 0.95rem;
  white-space: nowrap;
}

.file-list__remove {
  min-height: 2.5rem;
  padding: 0.3rem 0.85rem;
  font: inherit;
  font-size: 0.95rem;
  color: var(--color-accent);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  cursor: pointer;
}

.file-list__remove:hover {
  color: var(--color-accent-strong);
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 3rem;
  padding: 0.65rem 1.4rem;
  font: inherit;
  font-weight: 650;
  color: #fff;
  background: var(--color-accent);
  border: 2px solid var(--color-accent);
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
}

.button:hover {
  color: #fff;
  background: var(--color-accent-strong);
  border-color: var(--color-accent-strong);
}

.button:disabled {
  cursor: progress;
  opacity: 0.75;
}

.button--secondary {
  color: var(--color-accent);
  background: var(--color-surface);
}

.button--secondary:hover {
  color: var(--color-accent-strong);
  background: var(--color-accent-soft);
}

.button .icon {
  width: 1.25rem;
  height: 1.25rem;
}

.info-list {
  margin: 0;
  padding-left: 1.25rem;
}

.info-list li + li {
  margin-top: 0.5rem;
}

.holiday-list {
  max-width: 26rem;
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
}

.holiday-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--color-border);
}

.holiday-list__date {
  font-variant-numeric: tabular-nums;
  color: var(--color-muted);
}

.field {
  margin-bottom: 0.5rem;
}

.field__label {
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 650;
}

.field__input {
  width: 100%;
  max-width: 10rem;
  min-height: 3rem;
  padding: 0.5rem 0.85rem;
  font: inherit;
  font-size: 1.1rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-muted);
  border-radius: 8px;
}

.field__input[aria-invalid="true"] {
  border: 2px solid #a5332a;
}

.alert {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding: 1rem 1.15rem;
  border-radius: var(--radius);
}

.alert--error {
  color: #6d1f1a;
  background: #fbeceb;
  border: 1px solid #e3b4b0;
}

.alert__icon {
  margin-top: 0.1rem;
  color: #a5332a;
}

.alert p {
  margin: 0;
}

.results__heading {
  margin-bottom: 1rem;
}

.result h2,
.failed h2 {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.result__icon {
  width: 1.75rem;
  height: 1.75rem;
  color: var(--color-accent);
}

.result__info {
  font-size: 1.05rem;
}

.failed__icon {
  width: 1.75rem;
  height: 1.75rem;
  color: #a5332a;
}

.file-summary {
  margin: 0 0 1.25rem;
  padding: 0;
  list-style: none;
}

.file-summary__item {
  display: flex;
  flex-direction: column;
  padding: 0.5rem 0;
}

.file-summary__item + .file-summary__item {
  border-top: 1px solid var(--color-border);
}

.file-summary__name {
  font-weight: 600;
  overflow-wrap: anywhere;
}

.file-summary__text {
  color: var(--color-muted);
}

.result__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.print-hints {
  margin-bottom: 1.5rem;
  padding: 1.15rem 1.25rem;
  background: var(--color-accent-soft);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
}

.print-hints h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.1rem;
  color: var(--color-accent-strong);
}

.print-hints__list {
  margin: 0 0 0.75rem;
  padding-left: 1.25rem;
}

.print-hints__list li + li {
  margin-top: 0.35rem;
}

.print-hints__note {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.preview {
  display: block;
  width: 100%;
  height: 34rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
}

[hidden] {
  display: none !important;
}

@media (max-width: 30rem) {
  .panel {
    padding: 1.15rem;
  }

  .result__actions .button,
  .upload .button,
  .year-form .button {
    width: 100%;
  }
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-muted);
  font-size: 0.9rem;
}

.site-footer .container {
  padding-block: 1.25rem;
}

.site-footer p {
  margin: 0;
}

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