/* css-version: percenta-redesign-final-visual */
:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-strong: #f8fafc;
  --surface-soft: #efecff;
  --text: #07112f;
  --muted: #667085;
  --border: #dde3f3;
  --primary: #5b4dff;
  --primary-dark: #3727c9;
  --primary-soft: #efecff;
  --accent: #7c3aed;
  --accent-soft: #f3e8ff;
  --success: #12b76a;
  --warning: #f79009;
  --input-bg: #ffffff;
  --result-bg: linear-gradient(135deg, #efecff 0%, #ffffff 100%);
  --success-soft: rgba(18, 183, 106, 0.12);
  --discount: #06b6d4;
  --discount-soft: rgba(6, 182, 212, 0.14);
  --warning-soft: rgba(247, 144, 9, 0.14);
  --compare: #7c3aed;
  --compare-soft: rgba(124, 58, 237, 0.12);
  --original: #ec4899;
  --original-soft: rgba(236, 72, 153, 0.12);
  --part: #16a34a;
  --part-soft: rgba(22, 163, 74, 0.12);
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --shadow-soft: 0 28px 90px rgba(15, 23, 42, 0.12);
  --container: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #080b16;
    --surface: #111827;
    --surface-strong: #172033;
    --surface-soft: #1b2540;
    --text: #f8fafc;
    --muted: #aab3c5;
    --border: #263247;
    --primary: #7c6dff;
    --primary-dark: #a99fff;
    --primary-soft: rgba(124, 109, 255, 0.16);
    --accent: #22d3ee;
    --accent-soft: rgba(124, 58, 237, 0.16);
    --success: #4ade80;
    --warning: #fbbf24;
    --input-bg: #0f172a;
    --result-bg: linear-gradient(135deg, rgba(124, 109, 255, 0.22), rgba(34, 211, 238, 0.1));
    --success-soft: rgba(74, 222, 128, 0.12);
    --discount-soft: rgba(34, 211, 238, 0.12);
    --warning-soft: rgba(251, 191, 36, 0.12);
    --compare-soft: rgba(167, 139, 250, 0.12);
    --original-soft: rgba(244, 114, 182, 0.12);
    --part-soft: rgba(74, 222, 128, 0.12);
    --shadow-soft: 0 24px 80px rgba(0, 0, 0, 0.35);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

body::before {
  content: "css-final";
  position: fixed;
  left: -9999px;
}

a {
  color: inherit;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
}

.skip-link:focus {
  left: 16px;
  top: 16px;
  z-index: 30;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 10px 14px;
  box-shadow: var(--shadow-soft);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 88%, transparent);
}

.site-shell {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

.header-row {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text);
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  font-weight: 900;
  box-shadow: 0 10px 24px rgba(91, 77, 255, 0.25);
}

.brand-name {
  font-size: 1.1rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.site-nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 999px;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  background: var(--surface);
  color: var(--text);
}

.page {
  max-width: 1280px;
  margin: 0 auto;
  padding: 28px 20px 64px;
}

.page-stack {
  display: grid;
  gap: 24px;
}

.page-intro {
  display: grid;
  gap: 8px;
  margin-bottom: 4px;
}

.page-intro h1,
.content-card h1 {
  margin: 0;
  font-size: clamp(1.95rem, 4vw, 3.15rem);
  line-height: 1.05;
  letter-spacing: -0.05em;
}

.page-intro p,
.content-card p,
.content-card li,
.calculator-copy,
.result-note,
.support-copy {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.calculator-card,
.content-card,
.guide-card,
.tip-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.calculator-card {
  overflow: hidden;
  padding: 38px;
  border-radius: 32px;
  box-shadow: 0 30px 90px rgba(15, 23, 42, 0.12);
}

.calculator-head {
  padding: 0 0 20px;
  display: grid;
  gap: 10px;
}

.calculator-title {
  margin: 0;
  font-size: clamp(2rem, 3.6vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.calculator-copy {
  max-width: 68ch;
}

.mode-grid {
  padding: 0 0 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.mode-chip {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  padding: 14px 18px;
  font-weight: 700;
  line-height: 1.15;
  min-height: 52px;
  cursor: pointer;
  transition: 0.18s ease;
  flex: 1 1 172px;
}

.mode-chip:hover,
.mode-chip:focus-visible {
  border-color: rgba(79, 70, 229, 0.28);
  background: var(--surface-soft);
}

.mode-chip.active {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-color: transparent;
  color: white;
  box-shadow: 0 12px 30px rgba(91, 77, 255, 0.28);
}

.calculator-body {
  padding: 0;
  display: grid;
  gap: 18px;
}

.calculator-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: stretch;
}

.entry-panel,
.result-panel {
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 30px;
  box-shadow: 0 16px 46px rgba(15, 23, 42, 0.06);
}

.entry-panel {
  padding: 30px;
  display: grid;
  gap: 22px;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--surface) 88%, var(--primary-soft)) 0%, var(--surface-strong) 100%);
}

.result-panel {
  padding: 14px;
}

.panel-heading {
  display: grid;
  gap: 8px;
}

.panel-title {
  margin: 0;
  font-size: clamp(1.45rem, 2.8vw, 2rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
}

.panel-copy {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
  max-width: 62ch;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.field-card {
  background: linear-gradient(180deg, #ffffff 0%, #f7f5ff 100%);
  border: 1px solid #dde3f3;
  border-radius: 24px;
  padding: 24px;
  min-height: 230px;
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
}

.section-label {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

.field-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.field label {
  font-size: 1.12rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.field-prefix {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  height: 40px;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: clamp(1.35rem, 3vw, 1.8rem);
  font-weight: 800;
}

.input-field {
  width: 100%;
  min-height: 86px;
  border: 1.5px solid var(--border);
  border-radius: 20px;
  padding: 16px 22px;
  background: var(--input-bg);
  color: var(--text);
  font-size: clamp(2.75rem, 6vw, 4rem);
  font-weight: 900;
  letter-spacing: -0.06em;
  line-height: 1;
  text-align: center;
}

.input-field::placeholder {
  color: color-mix(in srgb, var(--muted) 50%, transparent);
}

.input-field:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 6px var(--primary-soft);
}

.example-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.example-chip {
  border: 1px solid var(--border);
  background: var(--surface-soft);
  color: var(--text);
  border-radius: 999px;
  padding: 10px 13px;
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  transition: 0.18s ease;
}

.example-chip:hover,
.example-chip:focus-visible {
  background: var(--mode-soft, var(--primary-soft));
  border-color: color-mix(in srgb, var(--mode-color, var(--primary)) 24%, var(--border));
}

.result-card {
  height: 100%;
  padding: 24px;
  border-radius: 28px;
  border: 1px solid color-mix(in srgb, var(--primary) 18%, var(--border));
  background: var(--result-bg);
  display: grid;
  gap: 18px;
}

.result-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.result-label {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.result-display {
  display: grid;
  gap: 8px;
  padding: 22px;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(91, 77, 255, 0.18), rgba(124, 58, 237, 0.12), rgba(255, 255, 255, 0.92));
  border: 1px solid color-mix(in srgb, var(--primary-soft) 70%, var(--border));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.55);
}

.result-tag {
  margin: 0;
  color: var(--primary-dark);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.copy-button {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  padding: 9px 12px;
  cursor: pointer;
  font-weight: 700;
}

.result-value {
  margin: 0;
  font-size: clamp(3.5rem, 8vw, 5.5rem);
  line-height: 1;
  letter-spacing: -0.08em;
  color: var(--primary-dark);
  font-weight: 900;
}

.result-headline {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 800;
}

.result-detail,
.result-formula,
.result-note {
  font-size: 0.98rem;
}

.result-formula {
  color: var(--text);
  font-weight: 700;
}

.result-breakdown {
  display: grid;
  gap: 8px;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.info-card {
  padding: 16px;
  border-radius: var(--radius-md);
  background: var(--surface-soft);
  border: 1px solid var(--border);
}

.info-card strong {
  display: block;
  margin-bottom: 6px;
  color: var(--mode-color, var(--primary));
}

.calculator-support {
  padding: 0 28px 28px;
  display: grid;
  gap: 14px;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.support-card {
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
}

.support-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  color: var(--text);
}

.support-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.guide-section {
  display: grid;
  gap: 16px;
  margin-top: 6px;
}

.guide-heading {
  display: grid;
  gap: 8px;
}

.guide-heading h2,
.content-card h2 {
  margin: 0;
  font-size: clamp(1.35rem, 2.8vw, 2rem);
  letter-spacing: -0.04em;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.practical-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.practical-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px;
  background: linear-gradient(180deg, var(--surface), var(--surface-strong));
  display: grid;
  gap: 8px;
}

.practical-card strong {
  font-size: 1rem;
}

.practical-card span {
  color: var(--muted);
  line-height: 1.65;
}

.guide-card {
  text-decoration: none;
  padding: 20px;
  display: grid;
  gap: 8px;
  transition: 0.18s ease;
}

.guide-card:hover,
.guide-card:focus-visible {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--primary) 24%, var(--border));
}

.guide-card span {
  color: var(--muted);
  line-height: 1.6;
}

.content-card {
  padding: 28px;
  display: grid;
  gap: 18px;
}

.content-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.content-box {
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface-soft);
}

.content-box h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.content-box p,
.content-box li {
  color: var(--muted);
}

.content-box ul {
  margin: 0;
  padding-left: 18px;
}

.faq-list {
  display: grid;
  gap: 10px;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  padding: 0 16px;
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 0;
  font-weight: 800;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item p {
  margin: 0 0 16px;
  color: var(--muted);
  line-height: 1.65;
}

.callout {
  border-radius: var(--radius-md);
  border: 1px solid color-mix(in srgb, var(--primary) 18%, var(--border));
  background: var(--primary-soft);
  padding: 16px 18px;
}

.callout a {
  color: var(--primary-dark);
  font-weight: 700;
  text-decoration: none;
}

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 28px;
  background: color-mix(in srgb, var(--bg) 72%, transparent);
}

.footer-row {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--text);
}

.mode-percent {
  --mode-color: var(--primary);
  --mode-soft: var(--primary-soft);
}

.mode-discount {
  --mode-color: var(--discount);
  --mode-soft: var(--discount-soft);
}

.mode-increase {
  --mode-color: var(--warning);
  --mode-soft: var(--warning-soft);
}

.mode-compare {
  --mode-color: var(--compare);
  --mode-soft: var(--compare-soft);
}

.mode-original {
  --mode-color: var(--original);
  --mode-soft: var(--original-soft);
}

.mode-part {
  --mode-color: var(--part);
  --mode-soft: var(--part-soft);
}

@media (max-width: 980px) {
  .info-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .practical-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .page {
    padding: 18px 16px 44px;
  }

  .site-shell {
    padding: 0 16px;
  }

  .header-row {
    min-height: 60px;
    align-items: flex-start;
    padding: 12px 0;
  }

  .site-nav {
    gap: 6px;
  }

  .site-nav a {
    padding: 7px 10px;
  }

  .calculator-head,
  .mode-grid,
  .calculator-body,
  .calculator-support {
    padding-left: 0;
    padding-right: 0;
  }

  .mode-grid {
    flex-direction: column;
  }

  .field-grid,
  .support-grid,
  .guide-grid,
  .content-columns,
  .info-grid,
  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .result-top,
  .footer-row {
    align-items: flex-start;
  }

  .calculator-card {
    padding: 20px;
    border-radius: 26px;
  }

  .entry-panel,
  .result-panel {
    border-radius: 24px;
  }

  .entry-panel {
    padding: 20px;
  }

  .result-panel {
    padding: 10px;
  }

  .result-body {
    grid-template-columns: 1fr;
  }

  .input-field {
    min-height: 84px;
    font-size: clamp(2rem, 9vw, 2.8rem);
  }

  .result-card {
    padding: 18px;
  }

  .result-value {
    font-size: clamp(3rem, 14vw, 4.5rem);
  }

  .result-display {
    padding: 18px;
  }
}

.result-body {
  display: grid;
  grid-template-columns: minmax(260px, 0.85fr) minmax(0, 1.15fr);
  gap: 16px;
}