@charset "utf-8";

/* =========================
   JMAAB Open Conference 2025
   Page-scoped styles (prefix: .oc2025-*)
   ========================= */

/* ---- Tokens ---- */
:root {
  --oc-bg: #1a1a1a;
  --oc-bg-sec: #f4f4f4;
  --oc-text: #fff;
  --oc-text-weak: #b9c0cf;
  --oc-border: #2d3344;
  --oc-primary: #cc2a2a;
  --oc-accent: #116ea8;
  --oc-secondary: #0a3ab5;
}

/* ---- Base  ---- */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 97px;
}
body {
  min-width: 100%;
}
img {
  width: 100%;
}
.oc2025-wrapper * {
  box-sizing: border-box;
}
.oc2025-wrapper img {
  max-width: 100%;
  height: auto;
  display: block;
}
.l-footer {
  background: #1a1a1a;
}
.pc {
  display: block;
}
.sp {
  display: none;
}
@media screen and (max-width: 768px) {
  html {
    scroll-padding-top: 74px;
  }
  .l-header__logo-area__links > .c-link-icon {
    font-size: 11px;
  }
  .l-header__logo-area__logo {
    max-width: 120px;
  }
  .l-header__logo-area__inner {
    padding: 0;
    min-height: 50px;
  }
  .p-nav-topic-path {
    font-size: 10px;
  }
  .l-footer__login {
    padding-bottom: 50px;
  }
  .pc {
    display: none;
  }
  .sp {
    display: block;
  }
}

/* ---- Layout ---- */
.oc2025-wrapper {
  background: var(--oc-bg);
  line-height: 1.8;
}

.oc2025-inner {
  margin-right: auto;
  margin-left: auto;
  max-width: 1160px;
  width: calc(100% - 10vw);
}
/* ---- Buttons ---- */
.oc2025-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  text-decoration: none;
  font-weight: 700;
  padding: 12px 20px;
  min-width: 320px;
  transition: background-color 0.2s ease;
  color: #fff;
}
.oc2025-btn:active {
}
.oc2025-btn-primary {
  background-color: var(--oc-primary);
}
.oc2025-btn-secondary {
  background-color: var(--oc-secondary);
}

.oc2025-btn-primary:hover,
.oc2025-btn-secondary:hover {
  opacity: 1;
  background: #000;
}

.oc2025-btn-dark {
  background-color: #000;
}
.oc2025-btn-dark:hover {
  opacity: 1;
  background-color: #666;
}

@media screen and (max-width: 640px) {
  .oc2025-btn {
    min-width: 100%;
    width: 100%;
  }
}

/* ---- Hero ---- */
.oc2025-hero {
  position: relative;
  min-height: 770px;
  display: grid;
  place-items: center;
  overflow: clip;
  background: url(../img/oc2025/oc2025_bg.webp) no-repeat center;
}
.oc2025-hero__login {
  min-height: 570px;
}
.oc2025-hero__content {
  text-align: center;
  display: grid;
  grid-template-columns: auto auto;
  grid-template-rows: auto;
  width: fit-content;
  align-items: center;
}
.oc2025-hero__title {
  grid-column: 1 / span 2;
  margin: 0;
}
.oc2025-hero__title:after {
  content: '';
  height: 1px;
  width: 100%;
  display: block;
  background: linear-gradient(to right, transparent 0%, rgba(255, 255, 255, 0.9) 40%, rgba(255, 255, 255, 0.9) 60%, transparent 100%);
  margin-bottom: 8px;
}
.oc2025-hero__year {
  font-size: 1.05em;
  background: linear-gradient(180deg, #fff, #9ddcff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}
.oc2025-hero__date {
  margin: 0;
}
.oc2025-hero__cta {
  margin-right: auto;
}
@media screen and (max-width: 768px) {
  .oc2025-hero {
    min-height: 500px;
    padding: 13vw 6vw 3vw;
    box-sizing: border-box;
    background: url(../img/oc2025/oc2025_bg_sp.webp) no-repeat center / cover;
  }

  .oc2025-hero__title {
    grid-column: 1 / span 1;
  }

  .oc2025-hero__title:after {
    margin: 0;
  }
  .oc2025-hero__content {
    grid-template-columns: 1fr;
    max-width: 70%;
  }
  .oc2025-hero__cta {
    margin: 10px auto 0;
    width: calc(100% - 20px);
  }
  .oc2025-btn {
    margin: auto;
  }
}
@media screen and (max-width: 640px) {
  .oc2025-hero__content {
    max-width: 80%;
  }
}

/* ---- Greeting ---- */
.oc2025-greeting {
  margin: 0 auto 120px;
  background: rgba(255, 255, 255, 0.04);
  padding: 50px;
  color: var(--oc-text);
}
.oc2025-greeting__title {
  font-size: 24px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.3em;
}
.oc2025-greeting__text {
  margin-top: 30px;
}
@media screen and (max-width: 768px) {
  .oc2025-greeting {
    padding: 20px;
    margin-bottom: 50px;
  }
  .oc2025-greeting__title {
    font-size: 20px;
    margin: 0 0 20px 0;
  }
  .oc2025-greeting__text {
    margin-top: 10px;
    font-size: 12px;
  }
}

/* ---- Outline ---- */
.oc2025-outline {
  background: var(--oc-bg-sec);
  padding: 80px 0;
}
.oc2025-outline__title {
  font-size: 36px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.3em;
  margin: 0;
}
.oc2025-outline__info {
  display: grid;
  grid-template-columns: 1fr 5fr;
  gap: 0;
}
.oc2025-outline dt,
.oc2025-outline dd {
  border-bottom: 1px dotted var(--oc-bg);
  padding: 20px;
}
.oc2025-outline dt {
  font-weight: 700;
}
.oc2025-outline dd {
  margin: 0;
}
.oc2025-outline dt:last-of-type,
.oc2025-outline dd:last-of-type {
  border: none;
}

@media screen and (max-width: 768px) {
  .oc2025-outline {
    padding: 50px 0 20px;
  }
  .oc2025-outline__title {
    font-size: 24px;
  }
  .oc2025-outline__info {
    grid-template-columns: 1fr;
  }
  .oc2025-outline dt {
    width: fit-content;
    border: none;
    padding: 5px 0;
  }
  .oc2025-outline dt::before {
    content: '';
    display: inline-block;
    clip-path: polygon(100% 50%, 0 0, 0 100%);
    width: 6px;
    height: 10px;
    aspect-ratio: 1;
    background-color: #333;
    display: inline-block;
    content: '';
    margin-right: 5px;
  }
  .oc2025-outline dd {
    padding: 0 0 10px;
    font-size: 14px;
  }
}

/* ---- Entry  ---- */
.oc2025-entry {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 20px;
}
.oc2025-entry__card {
  background: #fff;
  padding: 30px;
}
.oc2025-entry__title {
  margin: 0 0 6px;
  font-weight: 700;
  font-size: 18px;
  position: relative;
  padding-left: 13px;
}
.oc2025-entry__title::before {
  content: '';
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 100%;
  background: var(--oc-primary);
  position: absolute;
  top: calc((100% - 7px) / 2);
  left: 0;
}
.oc2025-entry__desc {
  margin: 0 0 14px;
}
.oc2025-entry__attention {
  font-size: 12px;
}
@media screen and (max-width: 768px) {
  .oc2025-entry__title {
    font-size: 16px;
  }
  .oc2025-entry__desc {
    font-size: 13px;
  }
  .oc2025-entry__card {
    padding: 20px;
    border-radius: 10px;
  }
}
/* ---- Program ---- */
.oc2025-program {
  padding: 80px 0 100px;
  list-style: none;
  margin: 0;
  display: grid;
  gap: 14px;
  background: var(--oc-bg-sec);
  border-top: 1px solid var(--oc-bg);
}
.oc2025-section__title {
  font-size: 36px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.3em;
}
.oc2025-program__list {
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.oc2025-talk {
  background: #fff;
  padding: 30px;
}
.oc2025-talk__label {
  display: inline-block;
  font-weight: 800;
  letter-spacing: 0.06em;
  font-size: 12px;
  color: var(--oc-accent);
  margin: 0 0 6px;
}
.oc2025-talk__title {
  margin: 0 0 8px;
  font-size: 24px;
  line-height: 1.5;
  font-weight: 800;
}
.oc2025-talk__desc {
  margin: 0 0 10px;
}
.oc2025-talk__meta {
  margin: 30px 0 0 auto;
  font-size: 16px;
  text-align: right;
  font-weight: 700;
  width: fit-content;
  border-bottom: 1px solid #000;
}
.oc2025-talk__panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  list-style: none;
  padding: 0;
}
.oc2025-talk__panel li {
  background: var(--oc-bg-sec);
  padding: 15px;
  text-align: center;
  font-weight: 700;
}
@media screen and (max-width: 768px) {
  .oc2025-program {
    padding: 40px 0;
  }
  .oc2025-section__title {
    margin: 0 0 20px;
    font-size: 24px;
    letter-spacing: 0.1em;
  }
  .oc2025-talk__title {
    font-size: 18px;
  }
  .oc2025-talk__desc {
    font-size: 14px;
    border: none;
    letter-spacing: 0;
  }
  .oc2025-talk__meta {
    margin-left: auto;
    border: none;
    font-size: 14px;
    line-height: 1.3;
    letter-spacing: 0;
  }
  .oc2025-talk__meta span {
    font-size: 12px;
  }
  .oc2025-talk__panel {
    grid-template-columns: 1fr;
    gap: 2px;
    margin-bottom: 0;
  }
  .oc2025-talk__panel li {
    padding: 10px;
    font-size: 12px;
  }
}

.oc2025-follow {
  position: fixed;
  right: 0;
  bottom: 30px;
  margin: 0;
}
.oc2025-follow img {
  width: 35px;
}
.oc2025-follow a {
  color: #fff;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 12px;
  gap: 8px;
  background-color: var(--oc-secondary);
  border-radius: 8px 0 0 8px;
  line-height: 1;
  transition: background-color 0.2s ease;
}
.oc2025-follow a:hover {
  background-color: var(--oc-bg);
  opacity: 1;
}
@media screen and (max-width: 768px) {
  .oc2025-follow {
    width: 100%;
    bottom: 0;
  }
  .oc2025-follow a {
    padding: 15px 12px;
    flex-direction: row;
    justify-content: center;
    border-radius: 0;
  }
  .oc2025-follow img {
    width: 15px;
    display: block;
  }
}