/* ===== 爱心树表白 · 全局样式 =====
 * 纯 CSS 无依赖；页面按 1100px 设计稿布局，窄屏由 functions.js 等比缩放。
 */

:root {
  /* 主题色板：想整体换色，改这里即可 */
  --cream: #ffe; /* 页面底色（暖米白） */
  --ink: #231f20; /* 主文字 / 深色 */
  --muted: #666; /* 次要文字 */
}

/* ===== 基础重置 ===== */
html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--cream);
  color: var(--ink);
  font:
    14px/1.6 "微软雅黑",
    "Microsoft YaHei",
    "PingFang SC",
    "宋体",
    sans-serif;
  overflow-x: hidden; /* 小屏由 JS 等比缩放，禁止横向滚动 */
}

/* ===== 舞台：主体水平垂直居中，内容超高时容器自动撑开 ===== */
#main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  width: 100%;
}

#wrap {
  position: relative;
  width: 1100px; /* 设计稿宽度 */
}

/* ===== 情书文字与相恋计时（覆盖在画布上方） ===== */
#text {
  position: absolute;
  left: 60px;
  top: 80px;
  width: 400px;
  z-index: 2;
  pointer-events: none;
}

#code {
  display: none; /* 打字机动画开始时再显示 */
  font-size: 16px;
  line-height: 1.8;
}

#clock-box {
  position: absolute;
  left: 60px;
  top: 545px;
  display: none; /* 计时开始时由 JS 淡入 */
  opacity: 0;
  font-size: 28px;
  z-index: 2;
  pointer-events: none;
}

#clock-box .muted {
  color: var(--muted);
}

#clock {
  margin-left: 48px;
}

#clock .digit {
  font-size: 58px;
  color: var(--ink);
}

/* ===== 画布与错误提示 ===== */
#canvas {
  display: block;
  width: 1100px;
  height: 680px;
}

#error {
  display: none;
  margin: 80px auto 0;
  max-width: 640px;
  padding: 24px;
  text-align: center;
  line-height: 1.9;
  color: var(--muted);
}

/* ===== 交互小工具 ===== */
.hand {
  cursor: pointer;
}

.say {
  margin-left: 5px;
}

.space {
  margin-right: 150px;
}

/* ===== 背景音乐开关（右下角悬浮） ===== */
#sound {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 99;
  width: 44px;
  height: 44px;
  font-size: 20px;
  line-height: 1;
  border: none;
  border-radius: 50%;
  background: rgba(35, 31, 32, 0.82);
  color: #fff;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  transition:
    background 0.2s ease,
    transform 0.2s ease;
}

#sound:hover {
  background: rgba(190, 26, 37, 0.9);
  transform: scale(1.08);
}

#sound:active {
  transform: scale(0.96);
}

/* ===== 点击引导：霓虹流光描边（非全屏，点击穿透） ===== */
/* 画布 1100×680，心形种子绘制于 (530, 340)：霓虹环以心形为中心，文字悬于其下方 */
.guide {
  position: absolute;
  left: 530px;
  top: 340px;
  z-index: 5;
  width: 0;
  height: 0;
  pointer-events: none; /* 不拦截点击：必须点画布上的心形种子才会启动动画 */
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* 外层承载霓虹泛光：置于 mask 之外，避免光晕被环带裁掉 */
.guide-ring-glow {
  position: absolute;
  left: -75px;
  top: -75px;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  filter: drop-shadow(0 0 6px rgba(255, 77, 141, 0.85)) drop-shadow(0 0 18px rgba(125, 239, 255, 0.5));
}

/* 霓虹环：mask 只保留 78%–87% 半径的环带，其余镂空 */
.guide-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  -webkit-mask-image: radial-gradient(closest-side, transparent 0 78%, #000 78% 87%, transparent 87%);
  mask-image: radial-gradient(closest-side, transparent 0 78%, #000 78% 87%, transparent 87%);
  animation: ring-breathe 2.4s ease-in-out infinite;
}

/* 静态微光环底：一圈淡淡的粉-青渐变，托住整体 */
.guide-ring::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    from 0deg,
    rgba(255, 110, 170, 0.14),
    rgba(120, 220, 255, 0.14),
    rgba(255, 110, 170, 0.14)
  );
}

/* 环绕飞驰的流光：粉色彗尾 + 白-青亮头，沿环带高速旋转 */
.guide-sweep {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    from 0deg,
    rgba(125, 239, 255, 0) 0deg,
    rgba(125, 239, 255, 0) 235deg,
    rgba(255, 77, 141, 0.45) 300deg,
    rgba(255, 77, 141, 0.95) 335deg,
    #ffffff 352deg,
    rgba(125, 239, 255, 1) 360deg
  );
  animation: sweep-spin 1.6s linear infinite;
}

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

/* 呼吸：整环轻微缩放 + 明暗起伏，像灯带呼吸 */
@keyframes ring-breathe {
  0%,
  100% {
    opacity: 0.75;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.05);
  }
}

/* 下方流光文字：粉-青渐变从左往右反复扫过 */
.guide-text {
  position: absolute;
  left: 0;
  top: 84px;
  width: 300px;
  margin-left: -150px;
  text-align: center;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 3px;
  white-space: nowrap;
  background: linear-gradient(90deg, #ff4d8d, #2ec4ff, #ff4d8d);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: text-shimmer 2.4s linear infinite;
}

@keyframes text-shimmer {
  to {
    background-position: -200% 0;
  }
}