/* ============================================================
   植物大战僵尸 — UI 组件样式
   ============================================================ */

/* ---------- 开始界面 ---------- */
#start-screen {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: radial-gradient(ellipse at center, #3a2a10 0%, #1a0a00 100%);
  display: flex; align-items: center; justify-content: center;
  z-index: 100; flex-direction: column;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}

#start-screen.hidden {
  display: none;
}

.start-inner {
  text-align: center;
  max-width: 520px;
  padding: 20px;
}

.start-title {
  font-size: clamp(32px, 6vw, 52px);
  font-weight: bold;
  color: #a0ff60;
  text-shadow: 2px 2px 0 #206010, 0 0 30px rgba(120, 220, 60, 0.4);
  margin-bottom: 6px;
  letter-spacing: 2px;
}

.start-subtitle {
  font-size: clamp(14px, 2.5vw, 18px);
  color: #c8b880;
  margin-bottom: 28px;
}

.start-version {
  font-size: 12px;
  color: #8a7a50;
  margin-bottom: 18px;
}

.start-notice {
  font-size: 11px;
  color: #6a5a40;
  margin-bottom: 24px;
}

.start-btn {
  display: block;
  width: 220px;
  margin: 0 auto 12px;
  padding: 14px 0;
  font-size: 18px;
  font-weight: bold;
  font-family: inherit;
  border: 2px solid;
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
  background: linear-gradient(180deg, #5cb830 0%, #3a8018 100%);
  color: #fff;
  border-color: #2a6010;
  box-shadow: 0 4px 0 #205008, 0 6px 12px rgba(0,0,0,0.4);
}

.start-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 5px 0 #205008, 0 8px 16px rgba(0,0,0,0.5);
}

.start-btn:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 #205008, 0 3px 6px rgba(0,0,0,0.4);
}

.start-btn.muted {
  font-size: 14px;
  background: linear-gradient(180deg, #888 0%, #555 100%);
  border-color: #444;
  box-shadow: 0 4px 0 #333, 0 6px 12px rgba(0,0,0,0.3);
}

.start-btn.secondary {
  background: linear-gradient(180deg, #8a6a30 0%, #5a3e18 100%);
  border-color: #3a2010;
  box-shadow: 0 4px 0 #2a1808, 0 6px 12px rgba(0,0,0,0.4);
}

.start-btn.secondary:hover {
  box-shadow: 0 5px 0 #2a1808, 0 8px 16px rgba(0,0,0,0.5);
}

/* ---------- 操作说明弹窗 ---------- */
.modal-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.7);
  display: flex; align-items: center; justify-content: center;
  z-index: 200;
}

#instructions-modal.hidden,
#reset-confirm-modal.hidden {
  display: none;
}

.modal-panel {
  background: linear-gradient(180deg, #4a3820 0%, #2a1a08 100%);
  border: 2px solid #8a6a30;
  border-radius: 12px;
  padding: 28px 24px 20px;
  max-width: 460px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  position: relative;
  color: #e8d8b0;
  box-shadow: 0 8px 32px rgba(0,0,0,0.6);
}

.modal-title {
  font-size: 22px;
  font-weight: bold;
  color: #ffd21e;
  margin-bottom: 16px;
  text-align: center;
}

.modal-section {
  margin-bottom: 14px;
}

.modal-section h4 {
  font-size: 14px;
  color: #c8b060;
  margin-bottom: 4px;
}

.modal-section p, .modal-section li {
  font-size: 13px;
  color: #c8b898;
  line-height: 1.6;
}

.modal-section ul {
  margin: 0; padding-left: 18px;
}

.modal-close {
  position: absolute; top: 8px; right: 14px;
  background: none; border: none;
  color: #c8a060; font-size: 24px;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
  font-family: inherit;
}

.modal-close:hover {
  color: #ffd21e;
}

/* ---------- 手机提示 ---------- */
#mobile-tip {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: rgba(0,0,0,0.85); color: #ffd21e;
  padding: 10px 20px; border-radius: 8px;
  font-size: 13px; z-index: 150;
  font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
  text-align: center;
  border: 1px solid rgba(255,210,30,0.3);
  max-width: 90%;
}

#mobile-tip.hidden {
  display: none;
}

#mobile-tip .tip-close {
  background: none; border: none;
  color: #c8a060; font-size: 16px;
  cursor: pointer; margin-left: 8px;
  vertical-align: middle; padding: 0 4px;
}

/* ---------- 游戏工具栏 ---------- */
#game-toolbar {
  position: fixed; top: 8px; right: 8px;
  display: flex; gap: 6px; z-index: 50;
  opacity: 0.85; transition: opacity 0.2s;
}

#game-toolbar:hover {
  opacity: 1;
}

#game-toolbar.hidden {
  display: none;
}

.tool-btn {
  width: 34px; height: 34px;
  background: rgba(0,0,0,0.5);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 6px;
  color: #e8d8b0; font-size: 17px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  padding: 0;
  line-height: 1;
  transition: background 0.15s;
}

.tool-btn:hover {
  background: rgba(255,255,255,0.15);
}

.tool-btn:active {
  background: rgba(255,255,255,0.25);
}

/* ---------- 页脚 ---------- */
#site-footer {
  position: fixed; bottom: 0; left: 0; width: 100%;
  text-align: center; padding: 4px 8px;
  font-size: 10px; color: #5a4a30;
  font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
  z-index: 40;
  pointer-events: none;
}

#site-footer a {
  color: #7a6a40;
  pointer-events: auto;
  text-decoration: none;
}

#site-footer a:hover {
  color: #c8b060;
}

/* ---------- 通用 ---------- */
#start-screen .start-btn,
#start-screen .start-btn.secondary {
  font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
}

@media (prefers-reduced-motion: reduce) {
  .start-btn {
    transition: none;
  }
}

/* 移动端适配 */
@media (max-width: 600px) {
  .start-inner { padding: 12px; }
  .start-btn { width: 180px; padding: 12px 0; font-size: 16px; }
  .modal-panel { padding: 20px 14px 16px; max-height: 85vh; }
  .tool-btn { width: 30px; height: 30px; font-size: 15px; }
}