/* =============================================================
   日本AI大賞 2026 — Teaser Stylesheet
   ベース：白テキスト・キーカラー検討中（CSS変数 --key で一括変更可）
   ============================================================= */

:root {
  /* キーカラー：朱赤（日本伝統色・勲章感） */
  --key:        #b03030;
  --key-bright: #d24a4a;
  --key-mute:   rgba(176,48,48,0.6);
  --key-soft:   rgba(176,48,48,0.22);

  /* ベース背景 */
  --bg-base:    #0b0d12;                 /* 漆黒に近い深い藍 */

  /* テキスト（全白統一） */
  --text-hi:    #ffffff;
  --text-mid:   rgba(255,255,255,0.78);
  --text-low:   rgba(255,255,255,0.48);

  --line:       rgba(255,255,255,0.12);

  --font-min:   'Shippori Mincho', 'Yu Mincho', 'YuMincho', serif;
  --font-jp:    'Zen Kaku Gothic New', 'Hiragino Kaku Gothic ProN', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }

body {
  background: var(--bg-base);
  color: var(--text-hi);
  font-family: var(--font-min);
  font-weight: 500;
  line-height: 1.8;
  font-feature-settings: "palt";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
::selection { background: var(--text-hi); color: var(--bg-base); }

.teaser-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- NAV ---------- */
.teaser-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(11, 13, 18, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  padding: 18px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.teaser-nav__brand { display: flex; align-items: center; }
.teaser-nav__name {
  font-family: var(--font-min);
  font-weight: 700;
  font-size: 15px;
  color: var(--text-hi);
  letter-spacing: .18em;
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
}
.teaser-nav__name small {
  font-family: var(--font-min);
  font-weight: 500;
  font-size: 11px;
  color: var(--text-mid);
  letter-spacing: .24em;
}
.teaser-nav__status {
  font-family: var(--font-jp);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .3em;
  color: var(--key-bright);
  padding: 6px 16px;
  border: 1px solid var(--key-mute);
}

@media (max-width: 480px) {
  .teaser-nav { padding: 14px 20px; }
  .teaser-nav__name { font-size: 13px; gap: 10px; }
  .teaser-nav__name small { font-size: 10px; }
  .teaser-nav__status { font-size: 10px; padding: 4px 10px; letter-spacing: .22em; }
}

/* ---------- TEASER MAIN ---------- */
.teaser {
  flex: 1;
  min-height: 100vh;
  padding: 160px 32px 64px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: var(--bg-base);
  position: relative;
}

/* ---------- EYEBROW ---------- */
.teaser__eyebrow {
  font-family: var(--font-min);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: .4em;
  color: var(--key-bright);
  margin-bottom: 64px;
  padding-left: .4em;
  animation: fadeIn 1s .1s both;
}

/* ---------- TITLE ---------- */
.teaser__title {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
  animation: fadeIn 1.2s .25s both;
}
.teaser__title-main {
  font-family: var(--font-min);
  font-weight: 700;
  font-size: clamp(54px, 9vw, 132px);
  line-height: 1.1;
  letter-spacing: .08em;
  color: var(--text-hi);
  padding-left: .08em;
}
.teaser__title-year {
  font-family: var(--font-min);
  font-weight: 500;
  font-size: clamp(18px, 2vw, 26px);
  letter-spacing: .5em;
  color: var(--key-bright);
  padding-left: .5em;
}

/* ---------- TAGLINE ---------- */
.teaser__tagline {
  font-family: var(--font-min);
  font-weight: 500;
  font-size: clamp(15px, 1.6vw, 19px);
  letter-spacing: .14em;
  color: var(--text-mid);
  margin-bottom: 80px;
  max-width: 640px;
  line-height: 1.9;
  animation: fadeIn 1s .4s both;
}

/* ---------- RULE / DIVIDER ---------- */
.teaser__rule {
  width: 1px;
  height: 72px;
  background: linear-gradient(to bottom, transparent, var(--key-mute) 30%, var(--key-mute) 70%, transparent);
  margin-bottom: 64px;
  animation: ruleGrow 1.4s .7s both;
}
@keyframes ruleGrow {
  from { transform: scaleY(0); opacity: 0; }
  to   { transform: scaleY(1); opacity: 1; }
}

/* ---------- ANNOUNCE ---------- */
.teaser__announce {
  margin-bottom: 72px;
  animation: fadeIn 1.2s .9s both;
}
.teaser__announce-date {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-min);
  font-weight: 700;
  color: var(--text-hi);
  line-height: 1;
}
.teaser__announce-num {
  font-size: clamp(56px, 8vw, 104px);
  letter-spacing: -.01em;
  font-feature-settings: "lnum";
}
.teaser__announce-unit {
  font-size: clamp(20px, 2.2vw, 28px);
  font-weight: 500;
  color: var(--key-bright);
  margin-right: 10px;
  letter-spacing: .04em;
}
.teaser__announce-label {
  margin-top: 28px;
  font-family: var(--font-min);
  font-weight: 500;
  font-size: clamp(13px, 1.4vw, 16px);
  letter-spacing: .5em;
  color: var(--key-bright);
  padding-left: .5em;
}

/* ---------- INFO ROW ---------- */
.teaser__info {
  display: flex;
  align-items: stretch;
  gap: 48px;
  margin-bottom: 72px;
  padding: 28px 40px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  animation: fadeIn 1.2s 1.0s both;
}
.teaser__info-item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
  flex: 1;
}
.teaser__info-label {
  font-family: var(--font-min);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: .4em;
  color: var(--key-bright);
  padding-left: .4em;
}
.teaser__info-value {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-family: var(--font-min);
}
.teaser__info-value strong {
  font-weight: 700;
  font-size: clamp(18px, 2vw, 24px);
  color: var(--text-hi);
  letter-spacing: .04em;
}
.teaser__info-value strong small {
  font-size: 0.62em;
  font-weight: 500;
  color: var(--text-mid);
  margin-left: 4px;
  letter-spacing: .08em;
}
.teaser__info-value span {
  font-size: 12px;
  color: var(--text-mid);
  letter-spacing: .12em;
}
.teaser__info-divider {
  width: 1px;
  background: var(--line);
  flex-shrink: 0;
}

/* ---------- SCHEDULE ---------- */
.teaser__schedule {
  width: 100%;
  max-width: 760px;
  margin-bottom: 72px;
  animation: fadeIn 1.2s 1.1s both;
}
.schedule__year {
  font-family: var(--font-min);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: .4em;
  color: var(--key-bright);
  margin-bottom: 28px;
  text-align: center;
  padding-left: .4em;
}
.schedule {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  list-style: none;
  position: relative;
}
.schedule::before {
  content: '';
  position: absolute;
  left: 12.5%;
  right: 12.5%;
  top: 12px;
  height: 1px;
  background: linear-gradient(to right, var(--line) 0%, var(--key-mute) 50%, var(--key) 100%);
}
.schedule li {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
  position: relative;
  padding-top: 0;
}
.schedule li::before {
  content: '';
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--bg-base);
  border: 1px solid var(--key-mute);
  margin-bottom: 16px;
  position: relative;
  z-index: 2;
}
.schedule li.is-final::before {
  background: var(--key);
  border-color: var(--key);
  box-shadow: 0 0 0 4px rgba(176,48,48,0.18);
}
.schedule__month {
  font-family: var(--font-min);
  font-weight: 700;
  font-size: clamp(26px, 3vw, 38px);
  color: var(--text-hi);
  letter-spacing: -.01em;
  line-height: 1;
  display: inline-flex;
  align-items: baseline;
}
.schedule__month small {
  font-size: 0.46em;
  font-weight: 500;
  color: var(--text-mid);
  margin: 0 2px 0 1px;
  letter-spacing: 0;
}
.schedule li.is-final .schedule__month { color: var(--key-bright); }
.schedule li.is-final .schedule__month small { color: var(--key-bright); }
.schedule__step {
  font-family: var(--font-min);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--text-mid);
}
.schedule li.is-final .schedule__step { color: var(--key-bright); font-weight: 700; }

/* ---------- LEDE ---------- */
.teaser__lede {
  font-family: var(--font-min);
  font-weight: 400;
  font-size: 14px;
  line-height: 2.1;
  color: var(--text-mid);
  letter-spacing: .1em;
  margin-bottom: auto;
  padding-bottom: 80px;
  animation: fadeIn 1.2s 1.2s both;
}
.teaser__lede a {
  color: var(--key-bright);
  text-decoration: none;
  border-bottom: 1px solid var(--key-mute);
  padding-bottom: 1px;
  margin-left: 4px;
  transition: color .2s, border-color .2s;
}
.teaser__lede a:hover {
  color: var(--text-hi);
  border-color: var(--text-hi);
}

/* ---------- FOOTER ---------- */
.teaser__foot {
  margin-top: auto;
  padding-top: 40px;
  border-top: 1px solid var(--line);
  width: 100%;
  max-width: 1080px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  animation: fadeIn 1.2s 1.3s both;
}
.teaser__foot-host {
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-min);
  font-weight: 500;
}
.teaser__foot-label {
  font-size: 11px;
  letter-spacing: .4em;
  color: var(--key-bright);
  padding: 3px 10px;
  border: 1px solid var(--key-mute);
}
.teaser__foot-name {
  font-size: 13px;
  color: var(--text-mid);
  letter-spacing: .08em;
}
.teaser__foot-copy {
  font-family: var(--font-min);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--text-low);
}

@media (max-width: 720px) {
  .teaser { padding: 120px 20px 48px; }
  .teaser__title { margin-bottom: 24px; gap: 12px; }
  .teaser__title-main { letter-spacing: .06em; }
  .teaser__title-year { letter-spacing: .4em; }
  .teaser__tagline { margin-bottom: 56px; font-size: 13px; letter-spacing: .1em; }
  .teaser__rule { height: 56px; margin-bottom: 48px; }
  .teaser__announce { margin-bottom: 56px; }
  .teaser__announce-date { gap: 8px; }
  .teaser__announce-unit { margin-right: 6px; }

  .teaser__info {
    flex-direction: column;
    gap: 20px;
    padding: 24px 24px;
    margin-bottom: 56px;
  }
  .teaser__info-divider { width: 100%; height: 1px; }

  .schedule { grid-template-columns: repeat(2, 1fr); gap: 28px 0; }
  .schedule::before { display: none; }
  .schedule li::before { margin-bottom: 8px; }

  .teaser__foot {
    flex-direction: column;
    gap: 16px;
    text-align: center;
    padding-top: 32px;
  }
  .teaser__foot-host { flex-direction: column; gap: 10px; }
  .teaser__foot-name { font-size: 12px; line-height: 1.7; }
}

/* ---------- FADE-IN ANIM ---------- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}