/* 0. Foundation */
:root {
  --color-waseda: #8e1728;
  --color-keio: #001e62;
  --color-black: #231815;
  --color-white: #fff;
  --text-color: var(--color-black);
  --font-base: "Noto Sans JP", sans-serif;
  --font-serif: "Noto Serif JP", serif;
  --fw-light: 300;
  --fw-normal: 400;
  --fw-medium: 500;
  --fw-bold: 700;
  --fw-black: 900;
  --lh-base: 1.75;
  --rem: calc(1rem / 16);
  --opacity-effect: opacity .3s ease;
  --layer-lower: -1;
  --layer-middle: 0;
  --layer-upper: 1;
}

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

body,
div,
dl,
dt,
dd,
ul,
ol,
li,
h1,
h2,
h3,
h4,
h5,
h6,
form,
fieldset,
legend,
figure,
figcaption,
button,
input,
textarea,
p,
blockquote,
th,
td {
  margin: 0;
  padding: 0;
}

body {
  color: var(--text-color);
  font-family: var(--font-base);
  font-feature-settings: "palt";
  font-optical-sizing: auto;
  font-style: normal;
  font-weight: var(--fw-normal);
  line-height: var(--lh-base);
  letter-spacing: 0;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

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

button {
  border: none;
  padding: 0;
  background-color: transparent;
  appearance: none;
  cursor: pointer;
  outline: none;
}

li {
  list-style: none;
}

small,
em {
  font-style: normal;
}

img {
  border: 0;
  max-width: 100%;
  height: auto;
  vertical-align: top;
}

/* 1. Layout(l-) */
.l-footer {
  position: relative;
  padding-block: calc(10 * var(--rem));
  background-color: var(--color-waseda);
  z-index: var(--layer-middle);
}
.l-footer::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-keio);
  clip-path: polygon(63% 0, 100% 0, 100% 100%, 37% 100%);
  z-index: var(--layer-lower);
}
@media screen and (min-width: 768px) {
  .l-footer {
    padding-block: calc(20 * var(--rem));
  }
  .l-footer::after {
    clip-path: polygon(55% 0, 100% 0, 100% 100%, 45% 100%);
  }
}

.l-footer__container {
  margin-inline: auto;
  padding-inline: calc(35 * var(--rem));
  width: min(100%, 1000 * var(--rem));
}

.l-footer__text {
  color: var(--color-white);
  font-size: calc(14 * var(--rem));
  letter-spacing: .03em;
}
@media screen and (min-width: 768px) {
  .l-footer__text {
    margin-top: calc(40 * var(--rem));
  }
}

.l-footer__row {
  display: block;
  padding-left: 2.5em;
  text-indent: -2.5em;
}
@media screen and (min-width: 768px) {
  .l-footer__row {
    display: inline;
    padding-left: 0;
    text-indent: unset;
  }
  .l-footer__row:nth-of-type(2n) {
    margin-left: 1em;
  }
}
   
/* 2. Component(c-) */
.c-full-image {
  width: 100%;
}

.c-section {
  padding-block: calc(35 * var(--rem));
}
@media screen and (min-width: 768px) {
  .c-section {
    padding-block: calc(70 * var(--rem));
  }
}

.c-section--flush {
  padding-block: 0;
}

.c-section--bg {
  background-color: #dbe7ed;
}

.c-container {
  margin-inline: auto;
  padding-inline: calc(35 * var(--rem));
  width: min(100%, 1070 * var(--rem));
}

.c-heading {
  text-align: center;
}

.c-heading__text {
  display: inline-block;
  position: relative;
  text-indent: .54em;
  font-family: var(--font-serif);
  font-size: calc(27 * var(--rem));
  font-weight: var(--fw-medium);
  letter-spacing: .54em;
}
.c-heading__text::before,
.c-heading__text::after {
  content: "";
  position: absolute;
  top: 50%;
  width: .4em;
  height: 90%;
  background-image: linear-gradient(90deg, var(--color-waseda) 50%, var(--color-keio) 50%);
  transform: translateY(-50%);
}
.c-heading__text::before {
  right: calc(100% + 1em);
}
.c-heading__text::after {
  left: calc(100% + 1em);
}
@media screen and (min-width: 768px) {
  .c-heading__text {
    text-indent: .12em;
    font-size: calc(32 * var(--rem));
    letter-spacing: .12em;
  }
  .c-heading__text::before,
  .c-heading__text::after {
    width: .375em;
  }
}

.c-heading__text--ls120 {
  text-indent: .12em;
  letter-spacing: .12em;
}

/* 3. Project(p-) */
.p-overview {
  display: flex;
  flex-direction: column;
  gap: calc(40 * var(--rem));
  padding-block: calc(26 * var(--rem)) calc(40 * var(--rem));
}
@media screen and (min-width: 768px) {
  .p-overview {
    gap: calc(70 * var(--rem));
    padding-block: calc(66 * var(--rem)) calc(80 * var(--rem));
  }
}

.p-overview__topics {
  display: flex;
  flex-direction: column;
  gap: calc(45 * var(--rem));
  margin-top: calc(65 * var(--rem));
}
@media screen and (min-width: 768px) {
  .p-overview__topics {
    gap: calc(65 * var(--rem));
    margin-top: calc(95 * var(--rem));
  }
}

.p-overview__heading {
  position: relative;
  padding-bottom: .5em;
  font-family: var(--font-serif);
  font-size: calc(27 * var(--rem));
  font-weight: var(--fw-medium);
  letter-spacing: .07em;
}
.p-overview__heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: .3em;
  background-image: linear-gradient(90deg, var(--color-waseda) 50%, var(--color-keio) 50%);
}
@media screen and (min-width: 768px) {
  .p-overview__heading {
    font-size: calc(30 * var(--rem));
  }
}

.p-overview__text {
  margin-top: calc(24 * var(--rem));
  text-align: justify;
  font-size: calc(16 * var(--rem));
}
@media screen and (min-width: 768px) {
  .p-overview__text {
    font-size: calc(18 * var(--rem));
  }
}

.p-anchor-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: calc(15 * var(--rem));
}
@media screen and (min-width: 768px) {
  .p-anchor-list {
    gap: calc(12 * var(--rem));
  }
}

.p-anchor-list__item {
  width: min(50% - 7.5 * var(--rem), 145 * var(--rem));
  min-height: calc(58 * var(--rem));
}
@media screen and (min-width: 768px) {
  .p-anchor-list__item {
    width: min(25% - 4 * var(--rem), 190 * var(--rem));
    min-height: calc(50 * var(--rem));
  }
}

.p-anchor-list__link {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  width: 100%;
  height: 100%;
  background-color: var(--color-waseda);
  text-align: center;
  color: var(--color-white);
  font-size: calc(19 * var(--rem));
  font-weight: var(--fw-medium);
  letter-spacing: .02em;
  z-index: var(--layer-middle);
}
.p-anchor-list__link::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-keio);
  clip-path: polygon(66% 0, 100% 0, 100% 100%, 34% 100%);
  z-index: var(--layer-lower);
}
@media screen and (min-width: 768px) {
  .p-anchor-list__link {
    font-size: calc(22 * var(--rem));
    transition: var(--opacity-effect);
  }
  .p-anchor-list__link:hover {
    opacity: .8;
  }
}

.p-price-list {
  margin: calc(24 * var(--rem)) auto 0;
  width: min(100%, 663 * var(--rem));
  font-size: calc(26 * var(--rem));
  font-weight: var(--fw-medium);
}
@media screen and (min-width: 768px) {
  .p-price-list {
    display: grid;
    grid-template-columns: 36% 1fr;
    grid-template-rows: repeat(2, auto);
    gap: 0 calc(20 * var(--rem));
    margin-top: calc(40 * var(--rem));
    font-size: calc(30 * var(--rem));
  }
}

.p-price-list__row {
  display: flex;
}

.p-price-list__row--group {
  grid-column: 2;
  grid-row: 1/3;
}

.p-price-list__term--group,
.p-price-list__inside-list {
  flex: auto;
}

.p-price-list__term,
.p-price-list__description {
  flex: 0 0 auto;
}

.p-price-list__term {
  position: relative;
}

.p-price-list__yen {
  font-size: 70%;
}

.p-price-list__dots {
  flex: 1;
  margin-inline: .25em;
  height: auto;
  background-image: radial-gradient(circle, #333 1.5px, transparent 2px);
  background-size: 7.5px 100%;
  background-position: left center;
}

.p-price-list__age {
  position: absolute;
  top: 100%;
  left: 0;
  font-size: calc(17 * var(--rem));
  white-space: nowrap;
}
@media screen and (min-width: 768px) {
  .p-price-list__age {
    position: static;
    font-size: calc(20 * var(--rem));
    white-space: wrap;
  }
}

.p-seating-chart {
  margin-top: calc(50 * var(--rem));
  text-align: center;
}

.p-ticket-btn {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  margin: calc(25 * var(--rem)) auto 0;
  padding-right: calc(50 * var(--rem));
  width: min(100%, 660 * var(--rem));
  min-height: calc(115 * var(--rem));
  background-color: var(--color-waseda);
  color: var(--color-white);
  font-size: calc(28 * var(--rem));
  letter-spacing: .07em;
  line-height: 1.3;
  z-index: var(--layer-middle);
}
.p-ticket-btn::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-keio);
  clip-path: polygon(62% 0, 100% 0, 100% 100%, 38% 100%);
  z-index: var(--layer-lower);
}
@media screen and (min-width: 768px) {
  .p-ticket-btn {
    margin-top: calc(50 * var(--rem));
    padding-left: calc(50 * var(--rem));
    min-height: calc(135 * var(--rem));
    font-size: calc(33 * var(--rem));
    transition: var(--opacity-effect);
  }
  .p-ticket-btn::after {
    clip-path: polygon(55% 0, 100% 0, 100% 100%, 45% 100%);
  }
  .p-ticket-btn:hover {
    opacity: .8;
  }
}

.p-ticket-btn__arrow {
  position: absolute;
  top: 50%;
  right: calc(17 * var(--rem));
  width: 29px;
  height: 29px;
  transform: translateY(-50%);
}
.p-ticket-btn__arrow::before,
.p-ticket-btn__arrow::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-white);
}
.p-ticket-btn__arrow::before {
  transform: rotate(55deg);
  transform-origin: right bottom;
}
.p-ticket-btn__arrow::after {
  transform: rotate(-55deg);
  transform-origin: right top;
}
@media screen and (min-width: 768px) {
  .p-ticket-btn__arrow {
    right: calc(21 * var(--rem));
    width: 35px;
    height: 35px;
  }
  .p-ticket-btn__arrow::before,
  .p-ticket-btn__arrow::after {
    height: 3px;
  }
}

.p-sale {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: calc(10 * var(--rem));
  margin-top: calc(18 * var(--rem));
  text-align: center;
}
@media screen and (min-width: 768px) {
  .p-sale {
    margin-top: calc(30 * var(--rem));
  }
}

.p-sale__text {
  display: inline-block;
  position: relative;
  color: var(--color-waseda);
  font-size: calc(25 * var(--rem));
  font-weight: var(--fw-bold);
  letter-spacing: .05em;
}
.p-sale__text::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: .25em;
  width: 100%;
  height: 2px;
  background-color: var(--color-waseda);
}
@media screen and (min-width: 768px) {
  .p-sale__text {
    font-size: calc(33 * var(--rem));
  }
  .p-sale__text::after {
    height: 3px;
  }
}

.p-sale__note {
  padding-left: 1em;
  text-align: left;
  text-indent: -1em;
  font-size: calc(18 * var(--rem));
}
@media screen and (min-width: 768px) {
  .p-sale__note {
    padding-left: 0;
    text-align: center;
    text-indent: unset;
    font-size: calc(20 * var(--rem));
  }
}

/* 4. Utility(u-) */
@media screen and (max-width: 767px) {
  .u-pc-only {
    display: none;
  }
}

@media screen and (min-width: 768px) {
  .u-sp-only {
    display: none;
  }
}