:root {
  --c1: #011f4b;
  --c2: #03396c;
  --c3: #005b96;
  --c4: #6497b1;
  --c5: #b3cde0;
  --bg: #e7f0f6;
  --panel: #f8fbfd;
  --panel-2: #edf5fa;
  --line: rgba(1, 31, 75, 0.14);
  --line-strong: rgba(1, 31, 75, 0.26);
  --text: #081523;
  --muted: #486073;
  --shadow: 0 16px 44px rgba(1, 31, 75, 0.08);
  --radius: 0px;
  --shell: min(1160px, calc(100% - 28px));
  --control-h: 48px;
  --font: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  --display: Bahnschrift, "Arial Narrow", "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html.modal-open, html.modal-open body { overflow: hidden; }
body {
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.75), rgba(231,240,246,0.96)),
    linear-gradient(90deg, rgba(1,31,75,0.05) 1px, transparent 1px),
    linear-gradient(rgba(1,31,75,0.05) 1px, transparent 1px),
    var(--bg);
  background-size: auto, 28px 28px, 28px 28px, auto;
}
button, input, select { font: inherit; }
button { cursor: pointer; }
input, select {
  width: 100%;
  height: var(--control-h);
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--text);
  padding: 0 14px;
  outline: none;
}
input:focus, select:focus, button:focus-visible {
  box-shadow: 0 0 0 3px rgba(0, 91, 150, 0.16);
}
.app-shell { width: var(--shell); margin: 0 auto; padding: 18px 0 24px; }
.panel {
  background: rgba(248, 251, 253, 0.95);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(4px);
}
.site-header, .main-panel, .site-footer, .stat-card, .inset-panel, .result-panel, .modal-panel { border-radius: var(--radius); }
.site-header {
  display: grid;
  grid-template-columns: minmax(0,1fr) auto;
  gap: 18px;
  align-items: start;
  padding: 22px;
  margin-bottom: 14px;
}
.eyebrow {
  margin: 0 0 8px;
  color: var(--c3);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 800;
  font-size: 11px;
}
h1, h2, h3 { font-family: var(--display); text-transform: uppercase; letter-spacing: 0.03em; margin: 0; }
h1 { font-size: clamp(1.9rem, 3vw, 3.25rem); line-height: 0.95; }
h2 { font-size: clamp(1.2rem, 2vw, 1.75rem); }
h3 { font-size: clamp(1.15rem, 2vw, 2rem); }
p { margin: 0; }
.hero-copy, .section-copy, .stat-card p:last-child, .muted, .modal-panel p, .quick-card__meta { color: var(--muted); line-height: 1.6; }
.hero-actions, .section-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: var(--control-h);
  min-height: var(--control-h);
  border: 1px solid var(--c2);
  background: var(--c2);
  color: #fff;
  padding: 0 16px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
}
.button:hover { background: var(--c3); }
.button--ghost {
  background: transparent;
  color: var(--c1);
  border-color: var(--line-strong);
}
.button--ghost:hover { background: rgba(179,205,224,0.2); }
.button--small { height: var(--control-h); min-height: var(--control-h); padding: 0 12px; font-size: 12px; }
.hero-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 14px;
  margin-bottom: 14px;
}
.stat-card { padding: 18px; min-height: 136px; }
.main-panel { padding: 16px; }
.tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 8px;
  margin-bottom: 14px;
}
.tab-button {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: flex-start;
  border: 1px solid var(--line-strong);
  background: var(--panel-2);
  color: var(--c1);
  padding: 14px;
  min-height: 62px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
}
.tab-button.is-active { background: var(--c1); color: #fff; border-color: var(--c1); }
.tab-index { opacity: 0.72; font-size: 12px; }
.tab-panel { display: none; }
.tab-panel.is-active { display: block; }
.section-head {
  display: grid;
  grid-template-columns: minmax(0,1fr) auto;
  gap: 14px;
  align-items: end;
  margin-bottom: 14px;
}
.tool-grid { display: grid; gap: 14px; }
.tool-grid--converter, .tool-grid--price, .tool-grid--format { grid-template-columns: minmax(300px, 410px) minmax(0,1fr); }
.inset-panel, .result-panel { padding: 16px; }
.form-stack { display: grid; gap: 12px; align-content: start; background: linear-gradient(180deg, rgba(255,255,255,0.9), rgba(237,245,250,0.9)); }
.field { display: grid; gap: 7px; }
.field span { font-size: 12px; text-transform: uppercase; letter-spacing: 0.12em; font-weight: 800; color: var(--c2); }
.two-col--locks { gap: 10px; }
.field-lock-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 42px;
  gap: 8px;
  align-items: end;
}
.field-lock-wrap--single {
  grid-template-columns: minmax(0, 1fr) 42px;
}
.field-lock-wrap .field,
.ratio-lock-row .field {
  min-width: 0;
}
.field-lock-wrap input,
.ratio-lock-row input {
  padding-inline: 11px;
}
.field-lock-wrap input.is-readonly,
.ratio-lock-row input.is-readonly {
  background: rgba(229, 237, 243, 0.95);
  color: var(--c2);
  cursor: not-allowed;
}
.lock-button {
  width: 42px;
  min-width: 42px;
  height: var(--control-h);
  min-height: var(--control-h);
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--c2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}
.lock-button:hover,
.lock-button:focus-visible {
  background: rgba(179,205,224,0.26);
}
.lock-button.is-locked {
  background: var(--c2);
  border-color: var(--c2);
  color: #fff;
}
.lock-button--ratio {
  align-self: end;
}
.lock-button__icon {
  font-size: 16px;
  line-height: 1;
}
.ratio-lock-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 42px minmax(0, 1fr);
  gap: 8px;
  align-items: end;
}
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.button-row { display: flex; gap: 10px; align-items: center; }
.wrap-row { flex-wrap: wrap; }
.compact-row .button { flex: 1; }
.results-stack { display: grid; gap: 14px; }
.accent-c1 { background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(179,205,224,0.28)); }
.accent-c2 { background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(100,151,177,0.18)); }
.accent-c3 { background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(0,91,150,0.10)); }
.quick-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 10px;
}
.quick-card {
  border: 1px solid var(--line);
  background: #fff;
  padding: 12px;
  min-height: 92px;
  display: grid;
  gap: 6px;
}
.quick-card strong { font-size: 15px; color: var(--c1); }
.quick-card__meta { font-size: 13px; }
.site-footer { margin-top: 14px; padding: 18px; }
.footer-grid { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 20px; align-items: start; }
.footer-block--support { min-width: 0; }
.footer-block--language { justify-self: end; }
.footer-support-links {
  flex-wrap: nowrap;
  justify-content: center;
  gap: 12px;
}
.footer-support-links .button-link {
  flex: 1 1 0;
  min-width: 0;
  white-space: nowrap;
  padding-inline: 16px;
}
.lang-switch {
  display: inline-grid;
  grid-template-columns: repeat(2, 1fr);
  height: var(--control-h);
  border: 1px solid var(--c2);
  background: var(--c5);
}
.lang-button {
  min-width: 76px;
  height: 100%;
  min-height: 100%;
  border: 0;
  background: var(--c5);
  color: var(--c1);
  font-weight: 800;
  letter-spacing: 0.1em;
}
.lang-button + .lang-button {
  border-left: 1px solid rgba(1,31,75,0.16);
}
.lang-button:hover,
.lang-button:focus-visible {
  background: var(--c4);
  color: #fff;
}
.lang-button.is-active {
  background: var(--c2);
  color: #fff;
}
.unit-switch {
  display: inline-grid;
  grid-template-columns: repeat(2, 1fr);
  height: var(--control-h);
  border: 1px solid var(--c2);
  background: var(--c5);
}
.unit-button {
  min-width: 76px;
  height: 100%;
  min-height: 100%;
  border: 0;
  background: var(--c5);
  color: var(--c1);
  font-weight: 800;
  letter-spacing: 0.1em;
}
.unit-button + .unit-button {
  border-left: 1px solid rgba(1,31,75,0.16);
}
.unit-button:hover,
.unit-button:focus-visible {
  background: var(--c4);
  color: #fff;
}
.unit-button.is-active {
  background: var(--c2);
  color: #fff;
}
.modal-root {
  position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; padding: 18px;
}
.modal-root[hidden] { display: none !important; pointer-events: none !important; }
.modal-root:not([hidden]) { display: grid; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(1,31,75,0.68); }
.modal { position: relative; display: none; max-width: 720px; width: 100%; }
.modal.is-active { display: block; }
.modal-panel { position: relative; background: #f9fcfe; border: 1px solid var(--line); padding: 20px; }
.modal-list { margin: 14px 0; padding-left: 18px; color: var(--muted); line-height: 1.7; }
.copy-flash { animation: flash 1.15s ease; }
@keyframes flash { 0% { background: rgba(100,151,177,0.45); } 100% { background: transparent; } }
@media (max-width: 920px) {
  .site-header, .section-head, .tool-grid--converter, .tool-grid--price, .tool-grid--format, .footer-grid { grid-template-columns: 1fr; }
  .hero-grid, .tabs { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .app-shell { width: min(100% - 18px, 100%); }
  .quick-grid, .two-col, .ratio-lock-row { grid-template-columns: 1fr; }
  .button-row { flex-wrap: wrap; }
  .button, .button--small { width: 100%; }
  .tab-button { justify-content: flex-start; }

  .field-lock-wrap,
  .field-lock-wrap--single,
  .ratio-lock-row {
    grid-template-columns: minmax(0, 1fr) 42px;
  }
  .ratio-lock-row .field:last-child {
    grid-column: 1 / -1;
  }
  .ratio-lock-row .lock-button--ratio {
    grid-row: 1;
    grid-column: 2;
  }
}
@media (max-width: 640px) {
  #modal-intro {
    max-width: none;
  }
  #modal-intro .modal-panel {
    max-height: min(calc(100vh - 18px), calc(100dvh - 18px));
    padding-bottom: 16px;
  }
  #modal-intro .modal-actions {
    margin-top: 16px;
    padding-top: 10px;
  }
}
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}
.support-links {
  align-items: stretch;
}
.button--site,
.button--support {
  text-transform: none;
  letter-spacing: 0.03em;
}
.support-links .button-link {
  min-width: 190px;
  height: var(--control-h);
  min-height: var(--control-h);
  justify-content: center;
  font-weight: 700;
  padding-inline: 18px;
  border: 1px solid var(--c2);
  background: var(--c2);
  color: #fff;
}
.support-links .button-link:hover,
.support-links .button-link:focus-visible {
  background: var(--c3);
  border-color: var(--c3);
  color: #fff;
}
.support-block--modal {
  align-items: center;
  text-align: center;
}
.support-block--modal .support-links {
  justify-content: center;
}
.modal-actions {
  margin-top: 20px;
  justify-content: center;
}
.modal-actions--full {
  width: 100%;
  justify-content: stretch;
  margin-top: 16px;
}
.modal-actions--full .button {
  width: 100%;
  flex: 1 1 auto;
}
.support-block--modal .support-links {
  justify-content: center;
}
#modal-intro .modal-panel {
  display: flex;
  flex-direction: column;
}
#modal-intro .modal-actions {
  width: 100%;
  justify-content: stretch;
  margin-top: 20px;
  position: sticky;
  bottom: 0;
  padding-top: 12px;
  background: linear-gradient(180deg, rgba(249,252,254,0), rgba(249,252,254,0.92) 22%, rgba(249,252,254,1) 100%);
}
#modal-intro .modal-actions .button {
  width: 100%;
  flex: 1 1 auto;
}
.modal-content-stack {
  display: grid;
  gap: 14px;
  margin: 16px 0;
}
.modal-section {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}
.modal-section:first-child {
  border-top: 0;
  padding-top: 0;
}
.modal-section h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}
.modal-section p {
  margin: 0 0 10px;
}
.modal-section ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.7;
}
.support-block {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 12px;
}
.support-copy,
.legal-note {
  color: var(--muted);
  line-height: 1.65;
}
.legal-copy .modal-panel,
.legal-copy {
  max-height: min(78vh, 920px);
}
.modal-panel {
  max-height: min(86vh, 960px);
  overflow: auto;
}



.button {
  border-radius: 0;
}
.button--stacked {
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 2px;
  min-width: 120px;
  padding-block: 8px;
}
.button-kicker {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.72;
}
.button-label {
  line-height: 1.1;
}
.field--search {
  position: relative;
}
.field--search input::placeholder {
  color: rgba(72, 96, 115, 0.7);
  opacity: 1;
}
.field--search input:focus::placeholder {
  color: rgba(72, 96, 115, 0.48);
}
.unit-search-row {
  gap: 12px;
}
.suggestion-box {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  z-index: 6;
  display: grid;
  gap: 6px;
  padding: 8px;
  background: rgba(248, 251, 253, 0.98);
  border: 1px solid var(--line-strong);
  border-radius: 0;
  box-shadow: 0 18px 36px rgba(1,31,75,0.14);
}
.suggestion-box[hidden] {
  display: none !important;
}
.suggestion-item {
  width: 100%;
  border: 1px solid rgba(1,31,75,0.08);
  background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(237,245,250,0.94));
  color: var(--text);
  text-align: left;
  padding: 10px 12px;
  border-radius: 0;
  display: grid;
  gap: 2px;
}
.suggestion-item:hover,
.suggestion-item:focus-visible {
  background: linear-gradient(180deg, rgba(100,151,177,0.18), rgba(179,205,224,0.22));
}
.suggestion-title {
  font-weight: 700;
  color: var(--c1);
}
.suggestion-meta {
  font-size: 12px;
  color: var(--muted);
}
#converter-main-category {
  background: linear-gradient(180deg, rgba(1,31,75,0.98), rgba(3,57,108,0.98));
  color: #fff;
  border-color: rgba(1,31,75,0.9);
}
#converter-category {
  background: linear-gradient(180deg, rgba(100,151,177,0.3), rgba(179,205,224,0.52));
  color: var(--c1);
  border-color: rgba(100,151,177,0.55);
}
#converter-main-category:focus,
#converter-category:focus {
  box-shadow: 0 0 0 3px rgba(0, 91, 150, 0.22);
}
#converter-main-category option {
  color: #111;
}
#converter-category option {
  color: #111;
}
.modal-panel {
  border-radius: 0;
  padding: 22px;
}
.modal-close {
  position: sticky;
  top: 0;
  margin-left: auto;
  margin-bottom: 10px;
  width: 42px;
  height: 42px;
  border-radius: 0;
  border: 1px solid rgba(1,31,75,0.16);
  background: rgba(237,245,250,0.95);
  color: var(--c1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  line-height: 1;
  z-index: 2;
}
.modal-close:hover,
.modal-close:focus-visible {
  background: rgba(179,205,224,0.38);
}
.modal-panel a:not(.button-link) {
  color: var(--c2);
  font-weight: 700;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.16em;
  word-break: break-word;
}
.modal-panel a:not(.button-link):hover,
.modal-panel a:not(.button-link):focus-visible {
  color: var(--c3);
}
.button-link {
  gap: 8px;
}
.button-link::after {
  content: '↗';
  font-size: 12px;
  opacity: 0.72;
}
.support-links .button-link {
  border-radius: 0;
}
.quick-card,
.tab-button,
.lang-switch,
.unit-switch,
input,
select {
  border-radius: 0;
}

.site-header .hero-copy {
  max-width: 62ch;
}


/* header palette + modal close alignment */
.site-header {
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  gap: 0;
  align-items: stretch;
  padding: 0;
  overflow: hidden;
}
.brand-block {
  min-width: 0;
  padding: 22px 22px 22px 26px;
}
.header-side {
  position: relative;
  min-width: 0;
  min-height: 170px;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  padding: 18px 28px;
}
.header-palette {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg,
    #b3cde0 0 20%,
    #6497b1 20% 40%,
    #005b96 40% 60%,
    #03396c 60% 80%,
    #011f4b 80% 100%
  );
}
.site-header .hero-actions {
  position: relative;
  z-index: 1;
  justify-content: flex-end;
  align-self: flex-start;
}
.site-header .hero-copy {
  max-width: 48ch;
}
.site-header .hero-actions .button--ghost {
  background: rgba(248, 251, 253, 0.88);
  border-color: rgba(1, 31, 75, 0.22);
}
.site-header .hero-actions .button--ghost:hover,
.site-header .hero-actions .button--ghost:focus-visible {
  background: rgba(248, 251, 253, 0.98);
}
.site-header .hero-actions .button {
  box-shadow: 0 10px 26px rgba(1, 31, 75, 0.12);
}
.modal-panel {
  padding-top: 64px;
}
.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  left: auto;
  margin: 0;
  z-index: 3;
}
@media (max-width: 920px) {
  .site-header {
    grid-template-columns: 1fr;
  }
  .brand-block {
    padding: 22px 22px 16px 22px;
  }
  .header-side {
    min-height: 116px;
    padding: 16px 18px 18px;
  }
}

/* v8: refined help buttons + richer modal color accents */
.section-actions .button--stacked {
  position: relative;
  min-width: 148px;
  min-height: 60px;
  padding: 10px 18px 11px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  text-align: center;
  background: linear-gradient(180deg, rgba(255,255,255,0.97), rgba(237,245,250,0.98));
  border-color: rgba(100,151,177,0.42);
  box-shadow: 0 10px 24px rgba(1,31,75,0.08);
}
.section-actions .button--stacked::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--c5), var(--c4), var(--c3), var(--c2));
}
.section-actions .button--stacked:hover,
.section-actions .button--stacked:focus-visible {
  background: linear-gradient(180deg, rgba(255,255,255,1), rgba(227,239,247,1));
  border-color: rgba(3,57,108,0.34);
  transform: translateY(-1px);
}
.section-actions .button--stacked .button-kicker,
.section-actions .button--stacked .button-label {
  display: block;
  width: 100%;
  text-align: center;
}
.section-actions .button--stacked .button-kicker {
  font-size: 10px;
  letter-spacing: 0.16em;
  opacity: 0.76;
}
.section-actions .button--stacked .button-label {
  color: var(--c1);
  line-height: 1.05;
}

.modal-panel {
  position: relative;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.92), rgba(249,252,254,0.98) 120px, rgba(243,249,252,1) 100%),
    linear-gradient(90deg, rgba(179,205,224,0.12), rgba(0,91,150,0.05));
  border-color: rgba(1,31,75,0.16);
  box-shadow: 0 26px 56px rgba(1,31,75,0.22);
  overflow: auto;
}
.modal-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 10px;
  background: linear-gradient(90deg,
    #b3cde0 0 20%,
    #6497b1 20% 40%,
    #005b96 40% 60%,
    #03396c 60% 80%,
    #011f4b 80% 100%
  );
}
.modal-panel::after {
  content: '';
  position: absolute;
  top: 10px;
  right: 0;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle at top right, rgba(100,151,177,0.20), transparent 70%);
  pointer-events: none;
}
.modal-panel > * {
  position: relative;
  z-index: 1;
}
.modal-section {
  border: 1px solid rgba(100,151,177,0.20);
  padding: 14px 14px 12px;
  background: linear-gradient(180deg, rgba(179,205,224,0.12), rgba(255,255,255,0.78));
}
.modal-section + .modal-section {
  margin-top: 4px;
}
.modal-section:first-child {
  border-top: 1px solid rgba(100,151,177,0.20);
  padding-top: 14px;
}
.support-block--modal {
  margin-top: 20px;
  padding: 14px 16px 0;
  border-top: 1px solid rgba(100,151,177,0.26);
  background: linear-gradient(180deg, rgba(100,151,177,0.12), rgba(255,255,255,0.86));
}
.modal-close {
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid rgba(1,31,75,0.26);
  background: linear-gradient(180deg, rgba(3,57,108,0.98), rgba(1,31,75,0.98));
  color: #fff;
  box-shadow: 0 12px 24px rgba(1,31,75,0.18);
}
.modal-close:hover,
.modal-close:focus-visible {
  background: linear-gradient(180deg, rgba(0,91,150,0.98), rgba(3,57,108,0.98));
  color: #fff;
}

@media (max-width: 640px) {
  .section-actions .button--stacked {
    min-width: 0;
  }
}


/* v9: force modal close buttons to the top right */
.modal-panel {
  position: relative !important;
  padding-top: 64px;
}
.modal-panel > .modal-close,
.modal .modal-close {
  position: absolute !important;
  top: 16px !important;
  right: 16px !important;
  left: auto !important;
  inset-inline-start: auto !important;
  inset-inline-end: 16px !important;
  margin: 0 !important;
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
  float: none !important;
  transform: none !important;
  z-index: 5;
}