@font-face {
  font-family: "SlideYouran";
  src: url("./assets/fonts/slideyouran-Regular.ttf") format("truetype");
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

#start-view {
  color-scheme: dark;
  /* 暖月光主题 —— 与樱花落日背景契合，暖白 + 落日金，透亮不发灰 */
  --gold: #ffdcc0;         /* 主强调色：暖樱金 */
  --gold-soft: #fff3e6;    /* 标题/文字：近白的暖月光 */
  --gold-deep: #b0876a;    /* 暗部暖金棕，用于阴影/描边 */
  --glow: 255, 224, 196;   /* 强调色 RGB（暖金），供 rgba() 复用 */
  --ink: #140d0a;
  --white: #fdefe2;
  --start-control-width: min(25.5rem, 100%);
  --fangsong-font: "FangSong", "STFangsong", "FangSong_GB2312", "仿宋", "Songti SC", "Noto Serif SC", "STSong", serif;
}

#start-view,
#start-view * {
  box-sizing: border-box;
}

#start-view {
  width: 100%;
  min-height: 100vh;
  margin: 0;
}

body.start-experience-active {
  overflow: hidden;
  font-family: "SlideYouran", "Songti SC", "Noto Serif SC", "STSong", serif;
  background: #140d0a;
  color: #fdefe2;
}

:where(#start-view) button,
:where(#start-view) input {
  font: inherit;
}

#start-view button {
  border: 0;
  cursor: pointer;
}

.stage {
  position: relative;
  display: grid;
  min-height: 100vh;
  overflow: hidden;
  place-items: center;
  isolation: isolate;
  background: #080a10;
}

body.start-auth-required #start-view .entry-panel {
  pointer-events: none;
  filter: blur(2px);
}

/* 登录 / 注册弹窗：认证前置，不能点击遮罩绕过。 */
.auth-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  background: rgba(8, 5, 8, 0.62);
  opacity: 0;
  pointer-events: none;
  backdrop-filter: blur(9px);
  transition: opacity 220ms ease;
}

.auth-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.auth-modal {
  position: fixed;
  z-index: 21;
  top: 50%;
  left: 50%;
  display: none;
  width: min(92vw, 28rem);
  overflow: hidden;
  border: 1px solid rgba(var(--glow), 0.28);
  border-radius: 1rem;
  background:
    radial-gradient(circle at 70% 0%, rgba(var(--glow), 0.16), transparent 18rem),
    rgba(25, 16, 18, 0.94);
  color: var(--white);
  box-shadow: 0 2rem 7rem rgba(0, 0, 0, 0.58);
  transform: translate(-50%, -46%) scale(0.98);
}

.auth-modal.open {
  display: block;
  animation: authReveal 220ms ease both;
}

@keyframes authReveal {
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

.auth-head {
  padding: 1.4rem 1.5rem 1rem;
  border-bottom: 1px solid rgba(var(--glow), 0.16);
}

.auth-head p {
  margin: 0 0 0.3rem;
  color: var(--gold);
  font-family: "PingFang SC", sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.auth-head h2 {
  margin: 0;
  color: var(--gold-soft);
  font-size: clamp(1.45rem, 4vw, 1.9rem);
  font-weight: 500;
}

.auth-body {
  padding: 1.3rem 1.5rem 1.5rem;
}

.auth-intro {
  margin: 0 0 1rem;
  color: rgba(253, 239, 226, 0.68);
  font-family: "PingFang SC", sans-serif;
  font-size: 0.82rem;
  line-height: 1.7;
}

#account-form {
  display: grid;
  gap: 0.85rem;
}

.auth-field {
  display: grid;
  gap: 0.4rem;
}

.auth-field span {
  color: rgba(253, 239, 226, 0.82);
  font-family: "PingFang SC", sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
}

.auth-field input {
  width: 100%;
  min-height: 2.8rem;
  border: 1px solid rgba(var(--glow), 0.23);
  border-radius: 0.55rem;
  outline: none;
  background: rgba(255, 255, 255, 0.07);
  padding: 0 0.85rem;
  color: var(--white);
  font-family: "PingFang SC", sans-serif;
}

.auth-field input:focus {
  border-color: rgba(var(--glow), 0.66);
  box-shadow: 0 0 0 3px rgba(var(--glow), 0.1);
}

.password-field { position: relative; display: flex; }
.password-field input { width: 100%; padding-right: 2.5rem; }
.password-toggle {
  position: absolute; right: 0.3rem; top: 50%; transform: translateY(-50%);
  display: inline-flex; align-items: center; justify-content: center;
  width: 2rem; height: 2rem; border: none; border-radius: 0.4rem;
  background: transparent; color: rgba(253, 239, 226, 0.55); cursor: pointer;
}
.password-toggle:hover { color: var(--white); }
.password-toggle .icon-eye-open { display: none; }
.password-toggle[aria-pressed="true"] .icon-eye-closed { display: none; }
.password-toggle[aria-pressed="true"] .icon-eye-open { display: block; }

.auth-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
  margin-top: 0.3rem;
}

.auth-actions.is-register-mode {
  grid-template-columns: 1fr;
}

.auth-actions button {
  min-height: 2.8rem;
  border-radius: 0.55rem;
  font-family: "PingFang SC", sans-serif;
  font-weight: 700;
}

.auth-primary {
  background: var(--gold);
  color: #2a1712;
}

.auth-ghost {
  background: rgba(255, 255, 255, 0.08);
  color: var(--white);
  box-shadow: inset 0 0 0 1px rgba(var(--glow), 0.18);
}

.auth-status {
  min-height: 1.2rem;
  margin: 0.9rem 0 0;
  color: #d7ebd6;
  font-family: "PingFang SC", sans-serif;
  font-size: 0.8rem;
  line-height: 1.5;
}

.auth-status.bad {
  color: #ffb5a9;
}

.media-layer,
.shade-layer,
.spark-layer {
  position: absolute;
  inset: 0;
}

.media-layer {
  z-index: -3;
}

.hero-image,
.hero-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 42%;
  filter: none;
}

.hero-image {
  transform: scale(1.02);
}

/* 全屏视频浮在静态图之上，随鼠标做轻微视差位移。
   放大到 1.08 留出移动余量，避免位移时露出画面边缘空白；
   实际位移量由 JS 每帧写入 --px / --py，与静态图错位产生灵动感 */
.hero-video {
  z-index: 1;                       /* 在静态图之上、文字表单(z-index:2)之下 */
  transform:
    translate3d(var(--px, 0px), var(--py, 0px), 0)
    scale(1.08);
  opacity: 0;                       /* 初始隐藏，加载后淡入避免首帧闪现 */
  transition: opacity 900ms ease;
  will-change: transform, opacity;
}

.hero-video.is-ready {
  opacity: 1;
}

.shade-layer {
  z-index: -2;
  /* 只在文字区域和底部做极轻的压暗，保证可读性，背景整体清晰展现 */
  background:
    radial-gradient(ellipse 60% 55% at 50% 62%, rgba(6, 6, 16, 0.42), transparent 70%),
    linear-gradient(180deg, transparent 40%, rgba(6, 6, 16, 0.4));
}

.spark-layer {
  z-index: -1;
  pointer-events: none;
}

.spark {
  position: absolute;
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 999px;
  background: var(--gold);
  box-shadow: 0 0 1.2rem rgba(var(--glow), 0.72);
  opacity: 0.58;
  animation: floatSpark 5s ease-in-out infinite;
}

.spark-a {
  top: 18%;
  left: 16%;
}

.spark-b {
  top: 28%;
  right: 12%;
  animation-delay: -1.5s;
}

.spark-c {
  bottom: 20%;
  left: 23%;
  animation-delay: -2.7s;
}

.spark-d {
  right: 25%;
  bottom: 17%;
  animation-delay: -3.6s;
}

.entry-panel {
  position: relative;
  z-index: 2;                       /* 表单在跟随光晕(z-index:1)之上，保持可读可点 */
  width: min(39rem, calc(100vw - 2rem));
  padding: clamp(1rem, 3vw, 2rem);
  text-align: center;
  /* 从居中位置整体下移，避开人物面部、落到画面下方 */
  transform: translateY(clamp(5rem, 19vh, 12rem));
}

.topbar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 4;
  display: block;
  width: 100%;
  min-height: clamp(6.2rem, 7vw, 8rem);
  margin: 0 auto;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  pointer-events: none;
  animation: barReveal 650ms ease both;
}

.topbar::before,
.topbar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  pointer-events: none;
}

.topbar::before {
  display: none;
}

.topbar::after {
  display: none;
}

.topbar-logo {
  position: absolute;
  z-index: 1;
  display: inline-grid;
  place-items: center;
  min-height: 0;
  padding: 0;
  text-decoration: none;
  filter:
    drop-shadow(0 0 0.25rem rgba(255, 244, 225, 0.45))
    drop-shadow(0 0.2rem 0.65rem rgba(0, 0, 0, 0.4));
  pointer-events: auto;
  transition: filter 220ms ease, opacity 220ms ease;
}

.topbar-logo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
}

.topbar-logo-symbol {
  top: clamp(0.2rem, 0.5vw, 0.45rem);
  left: clamp(0.75rem, 1.15vw, 1.45rem);
  width: clamp(7.3rem, 7.1vw, 8.75rem);
  height: clamp(7.3rem, 7.1vw, 8.75rem);
}

.topbar-logo-symbol img {
  max-width: 100%;
  max-height: 100%;
}

.topbar-logo-text {
  top: clamp(0.15rem, 0.45vw, 0.42rem);
  right: clamp(0.65rem, 1.1vw, 1.3rem);
  width: clamp(7.8rem, 7.2vw, 9.2rem);
  height: clamp(5rem, 5.6vw, 6.45rem);
  margin: 0;
}

.topbar-logo-text img {
  width: 100%;
  height: 100%;
  border-radius: 0.3rem;
  object-fit: contain;
  object-position: 50% 50%;
  opacity: 1;
  transform: scaleX(1.24);
  filter:
    brightness(1.42)
    contrast(1.12)
    drop-shadow(0 0 0.55rem rgba(255, 246, 230, 0.36));
}

.topbar-logo:hover,
.topbar-logo:focus-visible {
  filter:
    drop-shadow(0 0 0.45rem rgba(255, 248, 236, 0.7))
    drop-shadow(0 0.22rem 0.7rem rgba(0, 0, 0, 0.46));
  outline: none;
}

.topbar-rail {
  content: "";
  display: none;
  position: relative;
  min-width: 0;
  min-height: 0;
  background: transparent;
  border: 0;
  box-shadow: none;
}

.topbar-actions {
  display: none;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-left: 0;
  border-left: 0;
}

.audio-toggle,
.download-pill {
  display: inline-grid;
  place-items: center;
  text-decoration: none;
}

.audio-toggle {
  width: 2.55rem;
  height: 2.55rem;
  padding: 0;
  border: 1px solid rgba(245, 249, 255, 0.72);
  border-radius: 999px;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.045);
  color: rgba(238, 242, 249, 0.92);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.26),
    0 0 0.65rem rgba(221, 231, 255, 0.18);
  font-size: 1.35rem;
  line-height: 1;
}

.download-pill {
  min-width: 6.2rem;
  height: 2rem;
  padding: 0 1.1rem;
  border: 1px solid rgba(245, 219, 198, 0.78);
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(255, 238, 218, 0.96), rgba(229, 203, 180, 0.9));
  color: rgba(86, 59, 47, 0.88);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.72),
    0 0.3rem 0.75rem rgba(0, 0, 0, 0.22);
  font-family: "SlideYouran", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-indent: 0.08em;
  white-space: nowrap;
}

.audio-toggle:hover,
.audio-toggle:focus-visible,
.download-pill:hover,
.download-pill:focus-visible {
  filter: brightness(1.08);
  outline: none;
}

.audio-toggle[aria-pressed="true"] {
  background: rgba(255, 244, 232, 0.2);
  color: #fff7ef;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.32),
    0 0 1rem rgba(var(--glow), 0.38);
}

.start-form {
  display: grid;
  align-content: space-between;
  gap: 0;
  min-height: clamp(15.2rem, 29vh, 18.4rem);
  width: min(33.5rem, 100%);
  margin: 0 auto;
}

.form-prompt {
  position: relative;
  margin: 0;
  text-align: center;
  color: #fff7ec;
  text-shadow:
    -0.8px -0.8px 0 rgba(74, 50, 35, 0.84),
    0.8px -0.8px 0 rgba(74, 50, 35, 0.84),
    -0.8px 0.8px 0 rgba(74, 50, 35, 0.84),
    0.8px 0.8px 0 rgba(74, 50, 35, 0.84),
    0 1.4px 0 rgba(82, 55, 38, 0.68),
    0 3px 7px rgba(0, 0, 0, 0.58),
    0 0 0.95rem rgba(255, 239, 214, 0.58);
  font-family: var(--fangsong-font);
  font-size: clamp(2.05rem, 4.05vw, 2.88rem);
  font-weight: 500;
  letter-spacing: 0.28em;
  text-indent: 0.28em;
  animation: riseIn 620ms ease both;
}

.form-prompt::after {
  content: "ENTER NAMES";
  display: block;
  margin-top: 0.22rem;
  color: rgba(255, 244, 229, 0.66);
  text-shadow:
    0 1px 0 rgba(86, 60, 42, 0.8),
    0 2px 5px rgba(0, 0, 0, 0.5);
  font-family: "Times New Roman", Georgia, serif;
  font-size: clamp(0.62rem, 1.18vw, 0.88rem);
  font-weight: 700;
  letter-spacing: 0.62em;
  text-indent: 0.62em;
}

.name-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  justify-self: center;
  width: var(--start-control-width);
}

.name-field {
  display: grid;
  position: relative;
}

/* 常驻假光标：未聚焦时也闪烁，提示输入框可编辑。
   放在居中占位文字「角色 N」的最左侧、不与文字重叠；聚焦或已填写时隐藏，交给真实光标 */
.name-field::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-2.55em, -50%);
  width: 2px;
  height: clamp(1.24rem, 2.35vw, 1.6rem);
  background: var(--gold-soft);
  box-shadow: 0 0 0.4rem rgba(var(--glow), 0.6);
  pointer-events: none;
  animation: caretBlink 1.1s step-end infinite;
}

/* 聚焦（显示真实光标）或已输入内容时，隐藏假光标 */
.name-field:focus-within::after,
.name-field:has(.name-input:not(:placeholder-shown))::after {
  display: none;
}

@keyframes caretBlink {
  0%,
  49% {
    opacity: 1;
  }

  50%,
  100% {
    opacity: 0;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.name-label {
  justify-self: start;
  color: rgba(var(--glow), 0.86);
  font-family: var(--fangsong-font);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.2em;
}

.name-input {
  width: 100%;
  height: 2.53rem;
  padding: 0 0.8rem;
  border: 1px solid rgba(255, 237, 215, 0.46);
  border-radius: 0.71rem;
  outline: none;
  background:
    radial-gradient(circle at 50% 28%, rgba(255, 244, 225, 0.12), transparent 50%),
    linear-gradient(180deg, rgba(92, 67, 54, 0.3), rgba(36, 24, 20, 0.34));
  backdrop-filter: blur(9px) saturate(112%);
  -webkit-backdrop-filter: blur(9px) saturate(112%);
  box-shadow:
    inset 0 1px 0 rgba(255, 250, 241, 0.22),
    inset 0 -1px 0 rgba(58, 36, 27, 0.55),
    inset 0 0 1.1rem rgba(255, 227, 192, 0.05),
    0 0.45rem 0.9rem rgba(0, 0, 0, 0.28),
    0 1.05rem 2.2rem rgba(0, 0, 0, 0.3);
  color: #fff1df;
  caret-color: #fffaf3;
  text-align: center;
  text-shadow:
    -0.7px -0.7px 0 rgba(88, 63, 47, 0.68),
    0.7px -0.7px 0 rgba(88, 63, 47, 0.68),
    -0.7px 0.7px 0 rgba(88, 63, 47, 0.68),
    0.7px 0.7px 0 rgba(88, 63, 47, 0.68),
    0 1.4px 0 rgba(74, 48, 34, 0.58),
    0 0 0.72rem rgba(255, 234, 208, 0.28),
    0 3px 8px rgba(0, 0, 0, 0.42);
  font-family: var(--fangsong-font);
  font-size: clamp(1.2rem, 2.25vw, 1.52rem);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-indent: 0.08em;
  transition:
    border-color 220ms ease,
    box-shadow 260ms ease,
    background 220ms ease,
    transform 260ms cubic-bezier(0.22, 1, 0.36, 1);
}

.name-input::placeholder {
  color: rgba(255, 234, 208, 0.78);
  font-size: clamp(1.2rem, 2.25vw, 1.52rem);
  font-weight: 500;
  letter-spacing: 0.08em;
  opacity: 1;
}

.name-input:hover {
  border-color: rgba(255, 241, 221, 0.76);
  background:
    radial-gradient(circle at 50% 22%, rgba(255, 244, 225, 0.16), transparent 52%),
    linear-gradient(180deg, rgba(112, 81, 62, 0.34), rgba(36, 24, 20, 0.36));
  transform: translateY(-2px);
  box-shadow:
    inset 0 1px 0 rgba(255, 250, 241, 0.34),
    inset 0 -1px 0 rgba(58, 36, 27, 0.55),
    inset 0 0 2rem rgba(255, 227, 192, 0.09),
    0 1rem 1.8rem rgba(0, 0, 0, 0.38),
    0 2.2rem 4.4rem rgba(0, 0, 0, 0.42);
}

.name-input:focus {
  border-color: rgba(255, 250, 241, 0.92);
  background:
    radial-gradient(circle at 50% 20%, rgba(255, 244, 225, 0.18), transparent 52%),
    linear-gradient(180deg, rgba(116, 84, 64, 0.38), rgba(36, 24, 20, 0.42));
  transform: translateY(-3px);
  box-shadow:
    inset 0 1px 0 rgba(255, 250, 241, 0.4),
    inset 0 -1px 0 rgba(58, 36, 27, 0.55),
    inset 0 0 2.4rem rgba(255, 227, 192, 0.12),
    0 0 0 0.22rem rgba(255, 238, 214, 0.18),
    0 1.2rem 2rem rgba(0, 0, 0, 0.4),
    0 2.6rem 5rem rgba(0, 0, 0, 0.45);
}

#start-view .start-button {
  position: relative;
  width: var(--start-control-width);
  justify-self: center;
  min-height: 3.9rem;
  margin-top: 0;
  border: 1px solid rgba(255, 238, 204, 0.68);
  border-radius: 999px;
  overflow: hidden;
  cursor: pointer;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 0.04rem;
  padding: 0.42rem clamp(1.62rem, 3.65vw, 2.73rem);
  background:
    radial-gradient(ellipse 18% 72% at 9% 48%, rgba(255, 255, 255, 0.2), transparent 72%),
    radial-gradient(ellipse 18% 72% at 91% 48%, rgba(255, 255, 255, 0.16), transparent 72%),
    radial-gradient(circle at 34% 12%, rgba(255, 255, 255, 0.18), transparent 12%),
    linear-gradient(180deg, rgba(255, 252, 237, 0.22), rgba(255, 238, 202, 0.2) 48%, rgba(219, 186, 142, 0.2));
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.36),
    inset 0 -1px 0 rgba(151, 104, 67, 0.24),
    inset 0 0 0.9rem rgba(255, 255, 255, 0.2),
    0 0 0 0.16rem rgba(255, 241, 211, 0.12),
    0 0.45rem 0.85rem rgba(51, 31, 20, 0.2),
    0 1.25rem 2.6rem rgba(0, 0, 0, 0.28),
    0 0 1.5rem rgba(255, 229, 192, 0.2);
  color: #5e4737;
  font-family: var(--fangsong-font);
  transition:
    border-color 200ms ease,
    color 200ms ease,
    transform 260ms cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 260ms ease;
}

#start-view .start-button > span {
  position: relative;
  z-index: 2;
  display: block;
  color: #fff4e2;
  text-shadow:
    -0.8px -0.8px 0 rgba(88, 62, 43, 0.84),
    0.8px -0.8px 0 rgba(88, 62, 43, 0.84),
    -0.8px 0.8px 0 rgba(88, 62, 43, 0.84),
    0.8px 0.8px 0 rgba(88, 62, 43, 0.84),
    0 1.5px 0 rgba(99, 68, 43, 0.68),
    0 4px 8px rgba(86, 51, 31, 0.42),
    0 0 1rem rgba(255, 250, 236, 0.62);
  font-size: clamp(1.38rem, 2.9vw, 1.95rem);
  font-weight: 500;
  line-height: 0.95;
  letter-spacing: 0.32em;
  text-indent: 0.32em;
}

#start-view .start-button > small {
  position: relative;
  z-index: 2;
  color: rgba(87, 58, 40, 0.96);
  text-shadow:
    0 1px 0 rgba(255, 255, 255, 0.72),
    0 0 0.35rem rgba(255, 235, 210, 0.36);
  font-family: "Times New Roman", Georgia, serif;
  font-size: clamp(0.46rem, 0.86vw, 0.62rem);
  font-weight: 800;
  letter-spacing: 0.62em;
  line-height: 1;
  text-indent: 0.62em;
}

#start-view .start-button::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
    105deg,
    transparent 0%,
    transparent 28%,
    rgba(255, 255, 255, 0.28) 42%,
    rgba(255, 251, 225, 0.12) 54%,
    transparent 68%,
    transparent 100%
  );
  transform: translateX(-120%);
  transition: transform 620ms ease;
  pointer-events: none;
}

#start-view .start-button::after {
  content: "";
  position: absolute;
  inset: 0.31rem 0.57rem;
  z-index: 1;
  border-radius: inherit;
  background:
    radial-gradient(circle at 4% 50%, rgba(196, 153, 87, 0.18) 0 0.13rem, transparent 0.16rem),
    radial-gradient(circle at 96% 50%, rgba(196, 153, 87, 0.16) 0 0.13rem, transparent 0.16rem),
    radial-gradient(circle at 14% 28%, rgba(255, 255, 255, 0.34) 0 0.09rem, transparent 0.12rem),
    radial-gradient(circle at 89% 22%, rgba(255, 255, 255, 0.32) 0 0.1rem, transparent 0.13rem),
    linear-gradient(90deg, rgba(188, 143, 82, 0.14), transparent 18%, transparent 82%, rgba(188, 143, 82, 0.12));
  opacity: 0.62;
  pointer-events: none;
}

#start-view .start-button:hover::before,
#start-view .start-button:focus-visible::before {
  transform: translateX(120%);
}

#start-view .start-button:hover,
#start-view .start-button:focus-visible {
  border-color: rgba(255, 252, 236, 0.98);
  transform: translateY(-4px);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.48),
    inset 0 -1px 0 rgba(151, 104, 67, 0.24),
    inset 0 0 1.1rem rgba(255, 255, 255, 0.26),
    0 0 0 0.18rem rgba(255, 241, 211, 0.14),
    0 0.75rem 1.3rem rgba(51, 31, 20, 0.22),
    0 1.7rem 3.3rem rgba(0, 0, 0, 0.3),
    0 0 2.2rem rgba(255, 232, 199, 0.26);
}

/* 悬停时文字轻微抖动（不干扰按钮本体的上浮 transform） */
#start-view .start-button:hover > span,
#start-view .start-button:focus-visible > span {
  animation: btnShake 0.5s ease-in-out infinite;
}

.hint {
  min-height: 1.4rem;
  margin: 1rem 0 0;
  color: rgba(var(--glow), 0.72);
  text-shadow:
    0 1px 3px rgba(0, 0, 0, 0.5),
    0 0 1rem rgba(var(--glow), 0.25);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 0.9rem;
  letter-spacing: 0.12em;
}

.age-notice {
  position: absolute;
  left: clamp(1.25rem, 2.8vw, 2.5rem);
  bottom: clamp(1.25rem, 3.3vw, 3rem);
  z-index: 3;
  max-width: min(15.5rem, calc(100vw - 2.5rem));
  padding: 0;
  color: rgba(225, 230, 238, 0.78);
  text-align: left;
  text-shadow:
    0 1px 0 rgba(0, 0, 0, 0.78),
    0 0 0.55rem rgba(0, 0, 0, 0.62);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(0.56rem, 0.66vw, 0.76rem);
  font-weight: 400;
  line-height: 1.42;
  letter-spacing: 0.02em;
  pointer-events: none;
}

.age-notice span {
  display: block;
}

@keyframes floatSpark {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(0.86);
  }

  50% {
    transform: translate3d(0.8rem, -1.2rem, 0) scale(1.15);
  }
}

/* subtle shake while the cursor rests on the button */
@keyframes btnShake {
  0%,
  100% {
    transform: translateX(0);
  }

  20% {
    transform: translateX(-1.5px);
  }

  40% {
    transform: translateX(1.5px);
  }

  60% {
    transform: translateX(-1px);
  }

  80% {
    transform: translateX(1px);
  }
}

/* staggered entrance for the form controls */
@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(1.1rem);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes barReveal {
  from {
    opacity: 0;
    transform: translateY(-0.45rem);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}


.name-field,
#start-view .start-button {
  animation: riseIn 620ms ease both;
}

.name-field:nth-of-type(1) {
  animation-delay: 80ms;
}

.name-field:nth-of-type(2) {
  animation-delay: 200ms;
}

#start-view .start-button {
  animation-delay: 320ms;
}

@media (prefers-reduced-motion: reduce) {
  .spark,
  .topbar,
  .topbar-logo,
  .name-field,
  .name-input,
  .name-input:hover,
  .name-input:focus,
  #start-view .start-button,
  #start-view .start-button::before,
  #start-view .start-button:hover,
  #start-view .start-button:focus-visible,
  #start-view .start-button:hover > span,
  #start-view .start-button:focus-visible > span {
    animation: none !important;
    transition: none !important;
    transform: none !important;
  }

  /* 偏好减少动态的用户：隐藏循环视频，露出静态背景图 */
  .hero-video {
    display: none;
  }
}

@media (max-width: 980px) {
  .topbar {
    width: 100%;
    justify-content: flex-start;
    overflow-x: hidden;
    overflow-y: visible;
    padding: 0;
  }

  .topbar::before,
  .topbar::after {
    left: 0;
    right: 0;
  }

  .topbar-logo-symbol {
    width: 6.8rem;
    height: 6.8rem;
  }

  .topbar-logo-symbol img {
    max-width: 100%;
    max-height: 100%;
  }

  .topbar-logo-text {
    width: 7.4rem;
    height: 5rem;
    margin: 0;
  }

  .topbar-logo-text img {
    width: 100%;
    height: 100%;
  }

  .topbar-actions {
    flex: 0 0 3.25rem;
    gap: 0;
    margin-left: 0;
    padding-right: 0;
  }

  .audio-toggle {
    width: 2.1rem;
    height: 2.1rem;
  }

  .download-pill {
    min-width: 5.25rem;
    height: 1.82rem;
    padding: 0 0.75rem;
    font-size: 0.78rem;
  }
}

@media (max-width: 720px) {
  body.start-experience-active {
    overflow: auto;
  }

  .stage {
    min-height: 100svh;
    padding: 5.25rem 1rem 4.8rem;
  }

  .entry-panel {
    transform: none;
  }

  .topbar {
    top: 0;
    min-height: 5rem;
  }

  .topbar-logo {
    min-height: 0;
    padding-inline: 0;
  }

  .topbar-logo-symbol {
    left: 0.55rem;
    width: 5.35rem;
    height: 5.35rem;
  }

  .topbar-logo-symbol img {
    max-width: 100%;
    max-height: 100%;
  }

  .topbar-logo-text {
    right: 0.45rem;
    width: 5.8rem;
    height: 3.85rem;
    margin: 0;
  }

  .topbar-logo-text img {
    width: 100%;
    height: 100%;
  }

  .topbar-rail {
    min-height: 0;
    min-width: 0;
  }

  .audio-toggle {
    width: 1.8rem;
    height: 1.8rem;
  }

  .download-pill {
    min-width: 5.4rem;
    height: 1.8rem;
    padding: 0 0.8rem;
    font-size: 0.78rem;
  }

  .age-notice {
    left: 1rem;
    bottom: 1rem;
    font-size: 0.68rem;
    line-height: 1.45;
  }

  .name-row {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .name-input {
    height: 4rem;
  }

  #start-view .start-button {
    height: 3.75rem;
  }

  #start-view .start-button::after {
    inset: 0 16%;
  }
}

/* 首次进入：先呈现品牌加载层，等视频真正开始播放后再揭开首页。 */
body.start-loading-active {
  background: #0b0707;
}

body.start-loading-active #start-view {
  z-index: 100;
}

body.start-loading-active .topbar,
body.start-loading-active .entry-panel,
body.start-loading-active .age-notice {
  opacity: 0;
  transform: translateY(0.85rem);
  transition:
    opacity 720ms ease,
    transform 720ms cubic-bezier(0.22, 1, 0.36, 1);
}

body.start-loading-ready .topbar,
body.start-loading-ready .entry-panel,
body.start-loading-ready .age-notice {
  opacity: 1;
  transform: translateY(0);
}

body.start-loading-active .entry-panel {
  transform: translateY(clamp(5.85rem, 20vh, 12.85rem));
}

body.start-loading-ready .entry-panel {
  transform: translateY(clamp(5rem, 19vh, 12rem));
}

.sijie-boot-loader {
  --loader-glow: 255, 226, 196;
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 0.74rem;
  padding: 2rem;
  color: #fff5e8;
  text-align: center;
  background:
    radial-gradient(circle at 50% 39%, rgba(var(--loader-glow), 0.12), transparent 17rem),
    radial-gradient(circle at 50% 50%, rgba(20, 10, 8, 0.26), rgba(6, 4, 7, 0.82) 61%),
    linear-gradient(180deg, rgba(7, 5, 8, 0.62), rgba(7, 5, 8, 0.92));
  backdrop-filter: blur(9px) saturate(112%);
  -webkit-backdrop-filter: blur(9px) saturate(112%);
  transition:
    opacity 820ms ease,
    visibility 820ms ease;
}

.sijie-boot-loader.is-done {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.boot-mark-wrap {
  position: relative;
  display: grid;
  width: clamp(7.1rem, 14vw, 10.2rem);
  aspect-ratio: 1;
  margin-bottom: 0.45rem;
  place-items: center;
  filter:
    drop-shadow(0 0 0.62rem rgba(255, 237, 214, 0.58))
    drop-shadow(0 0 2rem rgba(255, 187, 148, 0.28));
}

.boot-ring,
.boot-mark {
  position: absolute;
  inset: 0;
}

.boot-ring {
  border: 1px solid rgba(var(--loader-glow), 0.36);
  border-radius: 50%;
  opacity: 0.82;
}

.boot-ring-outer {
  animation: loaderOrbit 5.2s linear infinite;
}

.boot-ring-outer::before,
.boot-ring-inner::before {
  content: "";
  position: absolute;
  width: 0.46rem;
  height: 0.46rem;
  border-radius: 50%;
  background: #fff6e9;
  box-shadow: 0 0 1rem rgba(var(--loader-glow), 0.92);
}

.boot-ring-outer::before {
  top: 8%;
  left: 72%;
}

.boot-ring-inner {
  inset: 13%;
  border-color: rgba(255, 190, 164, 0.3);
  animation: loaderOrbitReverse 4.2s linear infinite;
}

.boot-ring-inner::before {
  right: 12%;
  bottom: 8%;
  width: 0.34rem;
  height: 0.34rem;
}

.boot-mark {
  width: 100%;
  height: 100%;
  object-fit: contain;
  animation:
    loaderSpin 7.5s linear infinite,
    loaderPulse 2.4s ease-in-out infinite;
}

.boot-kicker,
.boot-estimate,
.boot-status {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
}

.boot-kicker {
  color: rgba(255, 228, 200, 0.68);
  font-size: 0.66rem;
  font-weight: 800;
}

.sijie-boot-loader h2 {
  margin: 0;
  color: #fff9ef;
  text-shadow:
    0 1px 0 rgba(88, 56, 38, 0.8),
    0 0.55rem 1.6rem rgba(0, 0, 0, 0.52),
    0 0 1.6rem rgba(var(--loader-glow), 0.26);
  font-family: "SlideYouran", "Songti SC", "STSong", serif;
  font-size: clamp(1.75rem, 4.3vw, 3.1rem);
  font-weight: 500;
  letter-spacing: 0;
}

.boot-estimate {
  color: rgba(255, 244, 230, 0.82);
  font-size: clamp(0.9rem, 1.6vw, 1.05rem);
}

.boot-estimate strong {
  display: inline-block;
  min-width: 1.7em;
  color: #fffaf2;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.3em;
  font-weight: 700;
  text-shadow: 0 0 0.9rem rgba(var(--loader-glow), 0.44);
}

.boot-progress {
  position: relative;
  width: min(22rem, 72vw);
  height: 0.4rem;
  margin-top: 0.3rem;
  overflow: hidden;
  border: 1px solid rgba(var(--loader-glow), 0.25);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  box-shadow:
    inset 0 0 0.9rem rgba(0, 0, 0, 0.42),
    0 0 1.2rem rgba(var(--loader-glow), 0.12);
}

.boot-progress span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(
    90deg,
    rgba(255, 188, 154, 0.78),
    rgba(255, 250, 234, 0.98),
    rgba(255, 202, 170, 0.82)
  );
  box-shadow: 0 0 1.1rem rgba(var(--loader-glow), 0.5);
  transition: width 260ms ease;
}

.boot-status {
  min-height: 1.2rem;
  color: rgba(255, 234, 215, 0.62);
  font-size: 0.78rem;
}

@keyframes loaderSpin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes loaderPulse {
  0%,
  100% {
    opacity: 0.9;
    filter: brightness(1);
  }

  50% {
    opacity: 1;
    filter: brightness(1.18);
  }
}

@keyframes loaderOrbit {
  to {
    transform: rotate(360deg);
  }
}

@keyframes loaderOrbitReverse {
  to {
    transform: rotate(-360deg);
  }
}

@media (max-width: 720px) {
  body.start-loading-active .entry-panel,
  body.start-loading-ready .entry-panel {
    transform: none;
  }

  .sijie-boot-loader {
    padding: 1.2rem;
  }

  .sijie-boot-loader h2 {
    line-height: 1.35;
  }
}

@media (prefers-reduced-motion: reduce) {
  .boot-ring,
  .boot-mark {
    animation: none !important;
  }

  .sijie-boot-loader,
  body.start-loading-active .topbar,
  body.start-loading-active .entry-panel,
  body.start-loading-active .age-notice {
    transition: none !important;
  }
}