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

html {
  scroll-behavior: smooth;
}

:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-hover: #f0f2f8;
  --border: #e2e6ef;
  --border-strong: #c5cde0;
  --text: #0f1629;
  --text-muted: #5a6580;
  --text-dim: #8892a8;
  --accent: #4d6bfe;
  --accent-hover: #3b54e0;
  --accent-light: #edf0ff;
  --accent-strong: #1a2b4a;
  --low: #6b7280;
  --mid: #4d6bfe;
  --high: #002fa7;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 3px rgba(15, 22, 41, 0.06), 0 4px 12px rgba(15, 22, 41, 0.06);
  --shadow-lg: 0 4px 16px rgba(15, 22, 41, 0.10), 0 12px 40px rgba(15, 22, 41, 0.08);
  --maxw: 1024px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", SFMono-Regular, ui-monospace, Menlo, Consolas, monospace;
  --nav-h: 64px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button {
  font: inherit;
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

.wrap {
  width: min(100% - 48px, var(--maxw));
  margin: 0 auto;
}

/* === Navigation === */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-h);
}

.nav__inner {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand__logo {
  height: 30px;
  width: auto;
}

.brand__text {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: -0.01em;
}

.brand__text strong {
  color: var(--accent);
  font-weight: 700;
}

.nav__links {
  display: flex;
  gap: 20px;
  margin-left: auto;
  margin-right: 20px;
}

.nav__links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.nav__links a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* === Language Toggle === */
.lang-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  flex-shrink: 0;
}

.lang-toggle__btn {
  background: transparent;
  color: var(--text-muted);
  border: none;
  padding: 5px 13px;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.lang-toggle__btn.is-active {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}

.lang-toggle__btn:hover:not(.is-active) {
  color: var(--accent);
}

/* === Hero === */
.hero {
  padding: 56px 0 40px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: end;
}

.hero__kicker {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 16px;
}

.hero__title {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin: 0;
  color: var(--accent-strong);
}

.hero__desc {
  margin: 20px 0 0;
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.6;
}

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

.hero__tags span {
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 0.82rem;
  font-weight: 600;
}

.hero__visual {
  display: flex;
  align-items: end;
}

.hero__code-badge {
  background: linear-gradient(135deg, var(--accent), #6b86ff);
  color: #fff;
  border-radius: 999px;
  padding: 10px 22px;
  font-size: 0.88rem;
  font-family: var(--font);
  font-weight: 500;
  white-space: nowrap;
  letter-spacing: 0.02em;
  box-shadow: 0 2px 12px rgba(77, 107, 254, 0.25);
}

/* === Section === */
.section {
  padding: 36px 0;
}

.section-head {
  margin-bottom: 28px;
}

.section-head p {
  color: var(--text-muted);
  margin: 6px 0 0;
  max-width: 640px;
}

.section-num {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 4px;
}

.section-head h2 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

/* === Scoreboard === */
.score-section {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  margin: 0 0 36px;
}

.scoreboard {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 32px;
  align-items: stretch;
}

.scorecard {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.scorecard__header {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.scorecard__label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.gauge-bar {
  height: 6px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
}

.gauge-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--low), var(--mid), var(--high));
  border-radius: 99px;
  transition: width 0.5s ease;
}

.scorecard__main {
  flex: 1;
}

.scorecard__value-group {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.scorecard__num {
  font-size: clamp(3.4rem, 8vw, 5.2rem);
  font-weight: 800;
  letter-spacing: -0.06em;
  line-height: 1;
  color: var(--accent-strong);
}

.scorecard__denom {
  color: var(--text-dim);
  font-size: 1.1rem;
  font-weight: 500;
}

.scorecard__band {
  margin: 12px 0 0;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text);
}

.scorecard__summary {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin: 8px 0 0;
  max-width: 400px;
  line-height: 1.5;
}

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

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 28px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.15s, transform 0.1s;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--surface);
  color: var(--text-muted);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  font-weight: 500;
  font-size: 0.95rem;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.btn-secondary:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  color: var(--accent);
}

/* === Legend === */
.score-legend {
  border-left: 2px solid var(--border);
  padding-left: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 14px;
}

.legend__header {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.legend__item {
  display: grid;
  grid-template-columns: auto auto 1fr;
  gap: 8px 12px;
  align-items: center;
}

.legend__bar {
  width: 3px;
  height: 32px;
  border-radius: 99px;
  grid-row: span 2;
}

.legend__low .legend__bar { background: var(--low); }
.legend__mid .legend__bar { background: var(--mid); }
.legend__high .legend__bar { background: var(--high); }

.legend__range {
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.legend__label {
  justify-self: end;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.legend__desc {
  grid-column: 2 / -1;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* === Scan List === */
.scan-section {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  margin: 0 0 36px;
}

.scan-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.scan-row {
  display: grid;
  grid-template-columns: 3px 1fr 180px;
  gap: 18px;
  align-items: start;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}

.scan-row:last-child {
  border-bottom: none;
}

.scan-row:hover {
  background: var(--surface-hover);
  margin: 0 -12px;
  padding: 16px 12px;
  border-radius: var(--radius-sm);
  border-bottom-color: transparent;
}

.scan-row:last-child:hover {
  border-bottom-color: transparent;
}

.scan-row__indicator {
  width: 3px;
  height: 100%;
  min-height: 48px;
  border-radius: 99px;
  background: var(--border);
  transition: background 0.3s;
}

.scan-row.is-match .scan-row__indicator {
  background: var(--mid);
  box-shadow: 0 0 8px rgba(77, 107, 254, 0.3);
}

.scan-row.is-partial .scan-row__indicator {
  background: #f59e0b;
}

.scan-row__content {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.scan-row__top {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.scan-row__name {
  font-size: 1rem;
  font-weight: 600;
}

.scan-row__weight {
  font-size: 0.72rem;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 1px 8px;
  font-weight: 500;
}

.scan-row__desc {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
  max-width: 66ch;
  line-height: 1.45;
}

.scan-row__result {
  text-align: right;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.scan-row__value {
  font-size: 0.82rem;
  color: var(--text-muted);
  word-break: break-all;
}

.scan-row__score {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-dim);
  transition: color 0.2s;
}

.scan-row.is-match .scan-row__score,
.scan-row.is-partial .scan-row__score {
  color: var(--accent-strong);
}

/* === FAQ === */
.faq-section {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  margin: 0 0 36px;
}

.faq {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq details {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0 18px;
  transition: border-color 0.2s;
}

.faq details[open] {
  border-color: var(--accent);
}

.faq summary {
  cursor: pointer;
  padding: 16px 0;
  font-size: 0.98rem;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

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

.faq summary::after {
  content: "+";
  font-family: var(--mono);
  color: var(--accent);
  font-size: 1.2rem;
  font-weight: 500;
  transition: transform 0.2s;
}

.faq details[open] summary::after {
  transform: rotate(45deg);
}

.faq__body {
  padding: 0 0 16px;
}

.faq__body p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.65;
}

/* === Models === */
.models-section {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  margin: 0 0 36px;
}

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

.model-chip {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  transition: border-color 0.15s, color 0.15s;
}

.model-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
  cursor: pointer;
}

/* === Footer === */
.footer {
  border-top: 1px solid var(--border);
  margin-top: 16px;
}

.footer__inner {
  padding: 28px 0 48px;
}

.footer p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.84rem;
}

/* === Responsive === */

/* Tablet portrait / small desktop */
@media (max-width: 820px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .hero__visual {
    align-items: start;
  }

  .hero__code-badge {
    font-size: 0.8rem;
    padding: 8px 16px;
  }

  .scoreboard {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .score-legend {
    border-left: none;
    border-top: 1px solid var(--border);
    padding-left: 0;
    padding-top: 20px;
  }

  .scan-row {
    grid-template-columns: 3px 1fr;
  }

  .scan-row__result {
    grid-column: 2;
    flex-direction: row;
    text-align: left;
    gap: 12px;
  }

  .scan-row:hover {
    margin: 0;
    padding: 16px 0;
  }
}

/* Mobile portrait */
@media (max-width: 560px) {
  :root {
    --nav-h: 56px;
  }

  .wrap {
    width: min(100% - 24px, var(--maxw));
  }

  /* --- Nav --- */
  .brand__text {
    display: none;
  }

  .brand__logo {
    height: 26px;
  }

  .nav__links a {
    font-size: 0.82rem;
    padding: 4px 0;
  }

  .lang-toggle {
    margin-right: 0;
  }

  .lang-toggle__btn {
    padding: 4px 10px;
    font-size: 0.75rem;
  }

  /* --- Hero --- */
  .hero {
    padding: 20px 0 16px;
    gap: 12px;
  }

  .hero__kicker {
    font-size: 0.7rem;
    margin-bottom: 10px;
  }

  .hero__title {
    font-size: clamp(1.8rem, 10vw, 2.6rem);
  }

  .hero__desc {
    font-size: 0.92rem;
    margin-top: 12px;
  }

  .hero__tags {
    margin-top: 14px;
    gap: 6px;
  }

  .hero__tags span {
    font-size: 0.75rem;
    padding: 4px 10px;
  }

  .hero__code-badge {
    font-size: 0.72rem;
    padding: 6px 14px;
    white-space: normal;
    text-align: center;
  }

  /* --- Scorecard --- */
  .score-section {
    padding: 16px;
    margin: 0 0 16px;
  }

  .scorecard__num {
    font-size: clamp(2.6rem, 15vw, 3.6rem);
  }

  .scorecard__band {
    font-size: 1rem;
  }

  .scorecard__summary {
    font-size: 0.84rem;
  }

  .scorecard__actions {
    flex-direction: column;
  }

  .scorecard__actions button {
    width: 100%;
    justify-content: center;
    text-align: center;
  }

  .btn-primary,
  .btn-secondary {
    padding: 11px 18px;
    font-size: 0.9rem;
  }

  /* --- Legend --- */
  .score-legend {
    padding-top: 16px;
    gap: 10px;
  }

  .legend__item {
    grid-template-columns: auto auto 1fr;
    gap: 6px 10px;
  }

  .legend__bar {
    height: 28px;
  }

  .legend__range {
    font-size: 0.82rem;
  }

  .legend__label {
    font-size: 0.82rem;
  }

  .legend__desc {
    font-size: 0.75rem;
  }

  /* --- Sections --- */
  .section {
    padding: 16px 0;
  }

  .section-head {
    margin-bottom: 16px;
  }

  .section-head h2 {
    font-size: 1.2rem;
  }

  .section-head p {
    font-size: 0.88rem;
  }

  .scan-section,
  .faq-section,
  .models-section {
    padding: 16px;
    margin: 0 0 16px;
  }

  /* --- Scan rows --- */
  .scan-row {
    grid-template-columns: 3px 1fr;
    gap: 10px;
    padding: 12px 0;
  }

  .scan-row:hover {
    margin: 0;
    padding: 12px 0;
  }

  .scan-row__result {
    grid-column: 2;
    flex-direction: row;
    text-align: left;
    gap: 10px;
    align-items: center;
  }

  .scan-row__name {
    font-size: 0.9rem;
  }

  .scan-row__weight {
    font-size: 0.65rem;
    padding: 0 6px;
  }

  .scan-row__desc {
    font-size: 0.8rem;
  }

  .scan-row__value {
    font-size: 0.78rem;
  }

  .scan-row__score {
    font-size: 0.95rem;
  }

  .scan-row__indicator {
    min-height: 40px;
  }

  /* --- FAQ --- */
  .faq summary {
    font-size: 0.9rem;
    padding: 12px 0;
  }

  .faq__body p {
    font-size: 0.84rem;
  }

  .faq details {
    padding: 0 14px;
  }

  /* --- Models --- */
  .model-chip {
    padding: 6px 14px;
    font-size: 0.82rem;
  }

  /* --- Footer --- */
  .footer__inner {
    padding: 20px 0 32px;
  }

  .footer p {
    font-size: 0.78rem;
  }
}

/* Small phones */
@media (max-width: 400px) {
  .wrap {
    width: min(100% - 16px, var(--maxw));
  }

  .nav__links {
    gap: 8px;
  }

  .nav__links a {
    font-size: 0.75rem;
  }

  .lang-toggle__btn {
    padding: 3px 8px;
    font-size: 0.7rem;
  }

  .hero__title {
    font-size: 1.6rem;
  }

  .score-section,
  .scan-section,
  .faq-section,
  .models-section {
    padding: 12px;
  }

  .scan-row {
    gap: 8px;
    padding: 10px 0;
  }

  .scan-row:hover {
    padding: 10px 0;
  }

  .scan-row__name {
    font-size: 0.84rem;
  }

  .scan-row__result {
    flex-wrap: wrap;
    gap: 4px;
  }
}