:root {
  --ring-ink: #1c1916;
  --ring-ink-soft: #2f2a26;
  --ring-text: #2a2622;
  --ring-sub: #5c554e;
  --ring-muted: #8a8178;
  --ring-line: #e4ddd4;
  --ring-paper: #f7f4ef;
  --ring-paper-2: #efeae3;
  --ring-white: #ffffff;
  --ring-ember: #e07a3a;
  --ring-ember-deep: #c45a28;
  --ring-ember-soft: #f3c29a;
  --ring-max: 760px;
  --ring-wide: 1080px;
  --ring-pad-y: clamp(52px, 6vw, 88px);
  --ring-gutter: clamp(20px, 4vw, 28px);
}

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

html {
  scroll-behavior: smooth;
}

body.ring-lp {
  margin: 0;
  color: var(--ring-text);
  background: var(--ring-paper);
  font-family: "Noto Sans JP", sans-serif;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
}

.ring-container {
  width: min(var(--ring-max), 100%);
  margin-inline: auto;
  padding-inline: var(--ring-gutter);
}

.ring-container--wide {
  width: min(var(--ring-wide), 100%);
}

.ring-section {
  padding-block: var(--ring-pad-y);
}

.ring-section--dark {
  background: var(--ring-ink);
  color: #f4efe8;
}

.ring-section--soft {
  background: var(--ring-paper-2);
}

.ring-section--paper {
  background: var(--ring-paper);
}

.ring-label {
  display: inline-block;
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ring-ember);
}

.ring-section--dark .ring-label {
  color: var(--ring-ember-soft);
}

.ring-title {
  margin: 0;
  font-family: "Shippori Mincho B1", "Shippori Mincho", serif;
  font-weight: 500;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.35;
  letter-spacing: 0.02em;
  color: var(--ring-ink);
}

.ring-section--dark .ring-title {
  color: #f7f2eb;
}

.ring-lead {
  margin: 14px 0 0;
  font-size: clamp(14px, 1.5vw, 16px);
  color: var(--ring-sub);
  line-height: 1.85;
}

.ring-section--dark .ring-lead {
  color: rgba(244, 239, 232, 0.78);
}

.ring-accent {
  background: linear-gradient(120deg, var(--ring-ember), var(--ring-ember-deep));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.ring-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 0 28px;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--ring-ember), var(--ring-ember-deep));
  color: #fff;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  box-shadow: 0 10px 28px rgba(196, 90, 40, 0.28);
}

.ring-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(196, 90, 40, 0.36);
}

.ring-cta--ghost {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: none;
}

.ring-cta--ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  box-shadow: none;
}

.ring-head {
  text-align: center;
  max-width: 720px;
  margin-inline: auto;
}

.ring-head .ring-lead {
  max-width: 560px;
  margin-inline: auto;
}

/* Motion */
@keyframes ring-rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes ring-ken-burns {
  from {
    transform: scale(1.05);
  }
  to {
    transform: scale(1);
  }
}

@keyframes ring-pulse {
  0%,
  100% {
    opacity: 0.35;
    transform: scale(1);
  }
  50% {
    opacity: 0.7;
    transform: scale(1.08);
  }
}

.ring-reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.ring-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== FV ========== */
.ring-fv {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  padding: 0;
  overflow: hidden;
  background: var(--ring-ink);
}

.ring-fv__media {
  position: absolute;
  inset: 0;
}

.ring-fv__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  animation: ring-ken-burns 12s ease-out forwards;
  filter: brightness(0.62) saturate(0.9);
}

.ring-fv__veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(28, 25, 22, 0.25) 0%, rgba(28, 25, 22, 0.55) 45%, rgba(28, 25, 22, 0.92) 100%),
    radial-gradient(ellipse at 70% 20%, rgba(224, 122, 58, 0.22), transparent 55%);
}

.ring-fv__content {
  position: relative;
  z-index: 1;
  width: min(var(--ring-wide), 100%);
  margin-inline: auto;
  padding: clamp(28px, 6vw, 56px) var(--ring-gutter) clamp(40px, 7vw, 72px);
  color: #f7f2eb;
}

.ring-fv__brand {
  margin: 0 0 18px;
  font-family: "Shippori Mincho B1", "Shippori Mincho", serif;
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1.2;
}

.ring-fv__brand span {
  display: block;
  margin-top: 6px;
  font-family: "Noto Sans JP", sans-serif;
  font-size: clamp(11px, 1.3vw, 13px);
  font-weight: 500;
  letter-spacing: 0.22em;
  color: rgba(247, 242, 235, 0.62);
}

.ring-fv__headline {
  margin: 0;
  max-width: 16em;
  font-family: "Shippori Mincho B1", "Shippori Mincho", serif;
  font-size: clamp(28px, 5.2vw, 48px);
  font-weight: 500;
  line-height: 1.35;
}

.ring-fv__sub {
  margin: 16px 0 0;
  max-width: 28em;
  font-size: clamp(14px, 1.6vw, 17px);
  line-height: 1.8;
  color: rgba(247, 242, 235, 0.82);
}

.ring-fv__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.ring-fv__hint {
  margin: 18px 0 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(247, 242, 235, 0.5);
}

/* ========== Demo ========== */
.ring-demo__stage {
  margin-top: 28px;
  position: relative;
  border-radius: 4px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #111;
  box-shadow: 0 20px 60px rgba(28, 25, 22, 0.18);
}

.ring-demo__stage img,
.ring-demo__stage video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ring-demo__play {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border: 0;
  background: transparent;
  cursor: pointer;
  color: #fff;
}

.ring-demo__play-core {
  position: relative;
  width: 76px;
  height: 76px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(10px);
}

.ring-demo__play-core::before {
  content: "";
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.25);
  animation: ring-pulse 2.4s ease-in-out infinite;
}

.ring-demo__play-core svg {
  width: 28px;
  height: 28px;
  margin-left: 3px;
  fill: currentColor;
}

.ring-demo__caption {
  margin: 14px 0 0;
  text-align: center;
  font-size: 13px;
  color: var(--ring-muted);
}

.ring-demo__chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 22px;
}

.ring-chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 13px;
  color: rgba(247, 242, 235, 0.88);
}

/* ========== Audience ========== */
.ring-audience__grid {
  display: grid;
  gap: 18px;
  margin-top: 34px;
}

.ring-audience__item {
  display: grid;
  gap: 14px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--ring-line);
}

.ring-audience__item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.ring-audience__media {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: 4px;
}

.ring-audience__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s ease;
}

.ring-audience__item:hover .ring-audience__media img {
  transform: scale(1.04);
}

.ring-audience__copy h3 {
  margin: 0;
  font-family: "Shippori Mincho B1", serif;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 500;
  line-height: 1.4;
}

.ring-audience__copy p {
  margin: 8px 0 0;
  color: var(--ring-sub);
  font-size: 14px;
  line-height: 1.8;
}

/* ========== What / Why ========== */
.ring-split {
  display: grid;
  gap: 28px;
  align-items: center;
  margin-top: 28px;
}

.ring-split__media {
  aspect-ratio: 4 / 5;
  overflow: hidden;
  border-radius: 4px;
  background: #ddd;
}

.ring-split__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ring-split__note {
  margin: 18px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--ring-ember);
  background: rgba(224, 122, 58, 0.08);
  font-size: 14px;
  color: var(--ring-sub);
  line-height: 1.7;
}

.ring-why__points {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.ring-why__point {
  padding: 18px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.ring-why__point:last-child {
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.ring-why__point h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
}

.ring-why__point p {
  margin: 8px 0 0;
  color: rgba(244, 239, 232, 0.72);
  font-size: 14px;
  line-height: 1.8;
}

/* ========== Benefit ========== */
.ring-benefit__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 30px;
}

.ring-benefit__item {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 4px;
}

.ring-benefit__item:nth-child(1) {
  grid-column: 1 / -1;
  aspect-ratio: 16 / 9;
}

.ring-benefit__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.78);
  transition: transform 0.7s ease;
}

.ring-benefit__item:hover img {
  transform: scale(1.05);
}

.ring-benefit__item span {
  position: absolute;
  left: 14px;
  bottom: 12px;
  z-index: 1;
  font-family: "Shippori Mincho B1", serif;
  font-size: clamp(16px, 2vw, 22px);
  color: #fff;
  letter-spacing: 0.04em;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

.ring-benefit__quote {
  margin: 28px auto 0;
  max-width: 28em;
  text-align: center;
  font-family: "Shippori Mincho B1", serif;
  font-size: clamp(18px, 2.4vw, 24px);
  line-height: 1.7;
  color: var(--ring-ink);
}

/* ========== Voices ========== */
.ring-voices__group + .ring-voices__group {
  margin-top: 40px;
}

.ring-voices__group-title {
  margin: 0 0 16px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ring-ember-deep);
}

.ring-voices__list {
  display: grid;
  gap: 14px;
}

.ring-voice {
  padding: 18px 0;
  border-top: 1px solid var(--ring-line);
}

.ring-voice:last-child {
  border-bottom: 1px solid var(--ring-line);
}

.ring-voice p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ring-text);
}

.ring-voice cite {
  display: block;
  margin-top: 10px;
  font-style: normal;
  font-size: 12px;
  color: var(--ring-muted);
  letter-spacing: 0.02em;
}

/* ========== Focus ========== */
.ring-focus {
  position: relative;
  overflow: hidden;
}

.ring-focus__bg {
  position: absolute;
  inset: 0;
}

.ring-focus__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.45) saturate(0.85);
}

.ring-focus__veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(28, 25, 22, 0.55), rgba(28, 25, 22, 0.82));
}

.ring-focus__inner {
  position: relative;
  z-index: 1;
  text-align: center;
  color: #f7f2eb;
}

.ring-focus__inner .ring-title {
  color: #f7f2eb;
}

.ring-focus__inner .ring-lead {
  color: rgba(247, 242, 235, 0.78);
  max-width: 34em;
  margin-inline: auto;
}

.ring-focus__close {
  margin: 28px 0 0;
  font-family: "Shippori Mincho B1", serif;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.5;
}

/* ========== How to ========== */
.ring-howto__steps {
  display: grid;
  gap: 0;
  margin-top: 32px;
  counter-reset: ring-step;
}

.ring-howto__step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  padding: 22px 0;
  border-top: 1px solid var(--ring-line);
  counter-increment: ring-step;
}

.ring-howto__step:last-child {
  border-bottom: 1px solid var(--ring-line);
}

.ring-howto__num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--ring-ink);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
}

.ring-howto__num::before {
  content: counter(ring-step, decimal-leading-zero);
}

.ring-howto__step h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
}

.ring-howto__step p {
  margin: 6px 0 0;
  color: var(--ring-sub);
  font-size: 14px;
  line-height: 1.75;
}

.ring-howto__note {
  margin: 22px 0 0;
  text-align: center;
  font-size: 13px;
  color: var(--ring-muted);
}

/* ========== Product ========== */
.ring-product__specs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 28px;
}

.ring-product__spec {
  padding: 18px 16px;
  background: var(--ring-white);
  border: 1px solid var(--ring-line);
  text-align: center;
}

.ring-product__spec strong {
  display: block;
  font-family: "Shippori Mincho B1", serif;
  font-size: 18px;
  font-weight: 500;
  color: var(--ring-ink);
}

.ring-product__spec span {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--ring-muted);
}

.ring-product__details {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.ring-product__details li {
  display: grid;
  grid-template-columns: 7em 1fr;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--ring-line);
  font-size: 14px;
}

.ring-product__details dt,
.ring-product__details .k {
  color: var(--ring-muted);
}

.ring-product__details .v {
  color: var(--ring-text);
  font-weight: 500;
}

/* ========== Size ========== */
.ring-size__table-wrap {
  margin-top: 28px;
  overflow-x: auto;
  border: 1px solid var(--ring-line);
  background: var(--ring-white);
}

.ring-size__table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 14px;
}

.ring-size__table th,
.ring-size__table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--ring-line);
  vertical-align: top;
}

.ring-size__table th {
  background: var(--ring-ink);
  color: #fff;
  font-weight: 700;
  white-space: nowrap;
}

.ring-size__table tr:last-child td {
  border-bottom: 0;
}

.ring-size__table td:first-child {
  font-weight: 700;
  white-space: nowrap;
}

.ring-size__tips {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.ring-size__tip {
  padding: 16px 18px;
  background: rgba(224, 122, 58, 0.08);
  border-left: 3px solid var(--ring-ember);
  font-size: 14px;
  color: var(--ring-sub);
  line-height: 1.75;
}

.ring-size__tip strong {
  display: block;
  margin-bottom: 4px;
  color: var(--ring-ink);
}

/* ========== FAQ ========== */
.ring-faq__list {
  margin-top: 28px;
  display: grid;
  gap: 0;
}

.ring-faq__item {
  border-top: 1px solid var(--ring-line);
}

.ring-faq__item:last-child {
  border-bottom: 1px solid var(--ring-line);
}

.ring-faq__item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  font-size: 15px;
  font-weight: 700;
}

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

.ring-faq__item summary::after {
  content: "+";
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  color: var(--ring-ember);
  font-size: 20px;
  font-weight: 400;
}

.ring-faq__item[open] summary::after {
  content: "−";
}

.ring-faq__item p {
  margin: 0 0 18px;
  color: var(--ring-sub);
  font-size: 14px;
  line-height: 1.85;
}

/* ========== Final CTA / Cart ========== */
.ring-final {
  background:
    radial-gradient(ellipse at 50% 0%, rgba(224, 122, 58, 0.18), transparent 55%),
    var(--ring-ink);
  color: #f7f2eb;
  text-align: center;
}

.ring-final .ring-title {
  color: #f7f2eb;
}

.ring-final .ring-lead {
  color: rgba(247, 242, 235, 0.75);
}

.ring-cart {
  margin: 32px auto 0;
  max-width: 420px;
  padding: 24px 22px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  text-align: left;
}

.ring-cart__name {
  margin: 0;
  font-family: "Shippori Mincho B1", serif;
  font-size: 22px;
  font-weight: 500;
}

.ring-cart__meta {
  margin: 6px 0 0;
  font-size: 13px;
  color: rgba(247, 242, 235, 0.62);
}

.ring-cart__price {
  margin: 16px 0 0;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.ring-cart__price small {
  margin-left: 6px;
  font-size: 13px;
  font-weight: 400;
  color: rgba(247, 242, 235, 0.55);
}

.ring-cart__field {
  margin-top: 16px;
}

.ring-cart__field label {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(247, 242, 235, 0.62);
}

.ring-cart__field select {
  width: 100%;
  min-height: 46px;
  padding: 0 14px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(0, 0, 0, 0.25);
  color: #fff;
  font-family: inherit;
  font-size: 14px;
}

.ring-cart .ring-cta {
  width: 100%;
  margin-top: 18px;
}

.ring-cart__note {
  margin: 12px 0 0;
  font-size: 12px;
  color: rgba(247, 242, 235, 0.5);
  text-align: center;
}

/* ========== Responsive ========== */
@media (min-width: 768px) {
  .ring-audience__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .ring-audience__item {
    border-bottom: 0;
    padding-bottom: 0;
  }

  .ring-split {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 48px;
  }

  .ring-split--reverse {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .ring-split--reverse .ring-split__media {
    order: 2;
  }

  .ring-benefit__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 12px;
  }

  .ring-benefit__item:nth-child(1) {
    grid-column: span 2;
    aspect-ratio: 4 / 5;
  }

  .ring-benefit__item:nth-child(2),
  .ring-benefit__item:nth-child(3) {
    grid-column: span 2;
  }

  .ring-benefit__item:nth-child(4),
  .ring-benefit__item:nth-child(5) {
    grid-column: span 3;
    aspect-ratio: 16 / 10;
  }

  .ring-product__specs {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .ring-howto__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .ring-howto__step {
    grid-template-columns: 1fr;
    border: 0;
    padding: 0;
    text-align: center;
    justify-items: center;
  }

  .ring-howto__step:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 767px) {
  .ring-fv {
    min-height: 92svh;
  }

  .ring-product__details li {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}