@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;600&family=Noto+Sans+SC:wght@400;600&family=Russo+One&display=swap");
* {
  position: relative;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

html {
  background-color: #000;
}

body {
  overflow: hidden;
  color: rgba(255, 255, 255, 0.88); /* 0.5 → 0.88 提升可读性 */
  font-family: "Inter","Noto Sans SC","Russo One",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif; /* 更友好的中英文字体 */
  line-height: 1.4;        /* 1.25 → 1.4 更舒适 */
  letter-spacing: 0.03em;  /* 0.06em → 0.03em 更自然 */
}

.hide {
  opacity: 0;
  visibility: hidden;
}

.remove {
  display: none !important;
}

.blur {
  -webkit-filter: blur(12px);
          filter: blur(12px);
}

.container {
  height: 100%;
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: center;
          justify-content: center;
  -webkit-box-align: center;
          align-items: center;
}

.loading-init {
  width: 100%;
  align-self: center;
  text-align: center;
  text-transform: uppercase;
}
.loading-init__header {
  font-size: 2.2em;
  font-family: "Russo One", sans-serif;
  letter-spacing: 0.04em;
  color: #fff;
}
.loading-init__status {
  margin-top: 1em;
  font-size: 0.9em; /* 0.8 → 0.9 略增可读 */
  opacity: 0.85;    /* 0.75 → 0.85 */
}

.stage-container {
  overflow: hidden;
  box-sizing: initial;
  border: 1px solid #222;
  margin: -1px;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.35); /* 新增：景深 */
}
@media (max-width: 840px) {
  .stage-container {
    border: none;
    margin: 0;
    border-radius: 0;
    box-shadow: none;
  }
}

.canvas-container {
  width: 100%;
  height: 100%;
  -webkit-transition: -webkit-filter 0.3s;
  transition: -webkit-filter 0.3s;
  transition: filter 0.3s;
  transition: filter 0.3s, -webkit-filter 0.3s;
}
.canvas-container canvas {
  position: absolute;
  mix-blend-mode: lighten;
  -webkit-transform: translateZ(0);
          transform: translateZ(0);
}

.controls {
  position: absolute;
  top: 0;
  width: 100%;
  padding-bottom: 50px;
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: justify;
          justify-content: space-between;
  -webkit-transition: opacity 0.3s, visibility 0.3s;
  transition: opacity 0.3s, visibility 0.3s;
  padding: 8px 10px;               /* 新增：左右内边距 */
}
@media (min-width: 840px) {
  .controls {
    visibility: visible;
  }
  .controls.hide:hover {
    opacity: 1;
  }
}

.menu {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(0, 0, 0, 0.50); /* 0.42 → 0.50 略深 */
  -webkit-transition: opacity 0.3s, visibility 0.3s;
  transition: opacity 0.3s, visibility 0.3s;
  backdrop-filter: blur(8px);           /* 新增毛玻璃 */
  -webkit-backdrop-filter: blur(8px);
}
.menu__inner-wrap {
  display: -webkit-box;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
          flex-direction: column;
  -webkit-box-pack: center;
          justify-content: center;
  -webkit-box-align: center;
          align-items: center;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  -webkit-transition: opacity 0.3s;
  transition: opacity 0.3s;

  /* 新增卡片样式 */
  background: rgba(18,18,18,0.65);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.35);
  margin: 18px;
}

/* 设置标题与副标题 */
.menu__header {
  margin-top: auto;
  margin-bottom: 8px;
  padding-top: 16px;
  font-size: 2.1em; /* 2 → 2.1 */
  letter-spacing: 0.03em;
  color: #fff;
  text-transform: none; 
  font-family: "Russo One","Inter","Noto Sans SC",sans-serif;
}
.menu__subheader {
  margin-bottom: auto;
  padding-bottom: 12px;
  font-size: 0.9em; /* 0.86 → 0.9 */
  opacity: 0.9;     /* 0.8 → 0.9 */
  color: rgba(255,255,255,0.86);
  text-align: center;
}

/* 表单区 */
.menu form {
  width: 100%;
  max-width: 420px;   /* 400 → 420 */
  padding: 0 14px;    /* 0 10 → 0 14 */
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}
.menu .form-option {
  display: -webkit-box;
  display: flex;
  -webkit-box-align: center;
          align-items: center;
  margin: 14px 0; /* 16 → 14 略紧凑 */
  -webkit-transition: opacity 0.3s;
  transition: opacity 0.3s;
  gap: 10px;      /* 新增：更好的列间距 */
}
.menu .form-option label {
  display: block;
  width: 50%;
  padding-right: 12px;
  text-align: right;
  /* 删除 text-transform: uppercase; */
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: rgba(255,255,255,0.92);
}
.menu .form-option--select select {
  display: block;
  width: 50%;
  height: 36px; /* 30 → 36 更好点按 */
  font-size: 1rem;
  font-family: inherit; /* 继承上面的字体 */
  color: rgba(255, 255, 255, 0.95); /* 0.5 → 0.95 */
  letter-spacing: 0.02em;           /* 0.06 → 0.02 */
  background: rgba(255,255,255,0.06); /* transparent → 半透明 */
  border: 1px solid rgba(255, 255, 255, 0.22); /* 0.5 → 0.22 柔和 */
  border-radius: 8px;
  padding: 0 10px;
  transition: border-color .2s, box-shadow .2s, background .2s, color .2s;
}
.menu .form-option--select select option {
  background-color: #0b0b0b; /* black → 更柔和的深色 */
  color: #fff;
}
.menu .form-option--select select:hover {
  border-color: rgba(255,255,255,0.36);
  background: rgba(255,255,255,0.08);
}
.menu .form-option--select select:focus {
  outline: none;
  border-color: rgba(0,153,255,0.8);
  box-shadow: 0 0 0 3px rgba(0,153,255,0.25);
  background: rgba(255,255,255,0.10);
}

/* 复选框 */
.menu .form-option--checkbox input {
  display: block;
  width: 22px; 
  height: 22px; 
  margin: 0;
  opacity: 0.9;
  accent-color: #09F; 
  border-radius: 6px; 
}
/* 移动端交互优化 */
@media (max-width: 840px) {
  .menu .form-option select, .menu .form-option input {
    outline: none;
  }
  .menu .form-option label {
    width: 46%; 
    padding-right: 10px;
    font-size: 0.98rem;
  }
  .menu .form-option--select select {
    width: 54%;
  }
}

/* 关闭按钮 */
.close-menu-btn {
  position: absolute;
  top: 0;
  right: 0;
}

/* 顶部按钮外观 */
.btn {
  opacity: 0.28;
  width: 50px;
  height: 50px;
  display: -webkit-box;
  display: flex;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  cursor: default;
  -webkit-transition: opacity 0.3s, transform .2s ease;
  transition: opacity 0.3s, transform .2s ease;
  border-radius: 12px;       /* 新增：轻圆角 */
  backdrop-filter: blur(2px);
}
.btn--bright {
  opacity: 0.5;
}
@media (min-width: 840px) {
  .btn:hover {
    opacity: 0.6;          /* 0.32 → 0.6 */
    transform: translateY(-1px);
  }
  .btn--bright:hover {
    opacity: 0.85;         /* 0.75 → 0.85 */
  }
}
.btn svg {
  display: block;
  margin: auto;
}

/* 版权/链接 */
.credits {
  margin-top: auto;
  margin-bottom: 10px;
  padding-top: 6px;
  font-size: 0.9em;        /* 0.8 → 0.9 */
  opacity: 0.9;            /* 0.75 → 0.9 */
}
.credits a {
  color: rgba(255, 255, 255, 0.88); /* 0.5 → 0.88 */
  text-decoration: none;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.25); /* 新增：更明显可点击 */
}
.credits a:hover, .credits a:active {
  color: #fff; 
  border-bottom-color: rgba(0,153,255,0.6);
  text-decoration: none;
}

.help-modal {
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: center;
          justify-content: center;
  -webkit-box-align: center;
          align-items: center;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  visibility: hidden;
  -webkit-transition-property: visibility;
  transition-property: visibility;
  -webkit-transition-duration: 0.25s;
          transition-duration: 0.25s;
}
.help-modal__overlay {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  opacity: 0;
  -webkit-transition-property: opacity;
  transition-property: opacity;
  -webkit-transition-timing-function: ease-in;
          transition-timing-function: ease-in;
  -webkit-transition-duration: 0.25s;
          transition-duration: 0.25s;
}
.help-modal__dialog {
  display: -webkit-box;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
          flex-direction: column;
  -webkit-box-align: center;
          align-items: center;
  max-width: 400px;
  max-height: calc(100vh - 100px);
  margin: 10px;
  padding: 20px;
  border-radius: 12px;
  background-color: rgba(18, 18, 18, 0.75);
  border: 1px solid rgba(255,255,255,0.08);
  opacity: 0;
  -webkit-transform: scale(0.9, 0.9);
          transform: scale(0.9, 0.9);
  -webkit-transition-property: opacity, -webkit-transform;
  transition-property: opacity, -webkit-transform;
  transition-property: opacity, transform;
  transition-property: opacity, transform, -webkit-transform;
  -webkit-transition-timing-function: ease-in;
          transition-timing-function: ease-in;
  -webkit-transition-duration: 0.25s;
          transition-duration: 0.25s;
}
@media (min-width: 840px) {
  .help-modal__dialog {
    font-size: 1.1rem;
    max-width: 520px; 
  }
}
.help-modal__header {
  font-size: 1.5em;
  text-transform: none;
  text-align: center;
  color: #fff;
  font-family: "Russo One","Inter","Noto Sans SC",sans-serif;
}
.help-modal__body {
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1em 0;
  padding: 1em 0;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.92); 
}
.help-modal__close-btn {
  flex-shrink: 0;
  outline: none;
  border: none;
  border-radius: 8px;
  padding: 0.5em 0.9em;
  margin-top: 0.36em;
  font-family: "Inter","Noto Sans SC","Russo One",sans-serif;
  font-size: 1em;
  color: rgba(255, 255, 255, 0.92);
  text-transform: none;
  letter-spacing: 0.03em;
  background-color: rgba(255, 255, 255, 0.18);
  -webkit-transition: color 0.3s, background-color 0.3s, transform .15s;
  transition: color 0.3s, background-color 0.3s, transform .15s;
}
.help-modal__close-btn:hover, .help-modal__close-btn:active, .help-modal__close-btn:focus {
  color: #FFF;
  background-color: #09F;
  transform: translateY(-1px);
}
.help-modal.active {
  visibility: visible;
  -webkit-transition-duration: 0.4s;
          transition-duration: 0.4s;
}
.help-modal.active .help-modal__overlay {
  opacity: 1;
  -webkit-transition-timing-function: ease-out;
          transition-timing-function: ease-out;
  -webkit-transition-duration: 0.4s;
          transition-duration: 0.4s;
}
.help-modal.active .help-modal__dialog {
  opacity: 1;
  -webkit-transform: scale(1, 1);
          transform: scale(1, 1);
  -webkit-transition-timing-function: ease-out;
          transition-timing-function: ease-out;
  -webkit-transition-duration: 0.4s;
          transition-duration: 0.4s;
}