/**
 * 语言选择界面样式
 * Language Selection Screen Styles
 * 风格与 opening.css 保持一致（黑底绿字 CRT 风格）
 */

/* ========== 语言选择界面容器 ========== */
.lang-select-screen {
  width: 100vw;
  height: calc(var(--vh, 1vh) * 100);
  display: flex;
  justify-content: center;
  align-items: center;
  background: #051005;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 6000; /* 高于 opening-screen 的 5000 */
}

.lang-select-screen.hidden {
  display: none;
}

/* ========== 主框架 ========== */
.lang-select-frame {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 60px;
  position: relative;
}

/* ========== 标题 ========== */
.lang-title {
  font-size: 28px;
  color: #00FF00;
  margin-bottom: 12px;
  letter-spacing: 4px;
  font-weight: 500;
  text-shadow:
    0 0 5px #00FF00,
    0 0 10px #00FF00;
  font-family: 'Fira Code', 'Zpix', 'Courier New', monospace;
}

.lang-title-sub {
  font-size: 24px;
  color: #00FF00;
  margin-bottom: 60px;
  letter-spacing: 2px;
  font-weight: 300;
  text-shadow:
    0 0 5px #00FF00,
    0 0 10px #00FF00;
  font-family: 'Fira Code', 'Zpix', 'Courier New', monospace;
}

/* ========== 语言按钮 ========== */
.lang-btn {
  display: block;
  width: 280px;
  padding: 18px 40px;
  margin-bottom: 20px;
  font-size: 22px;
  font-family: 'Fira Code', 'Zpix', 'Courier New', monospace;
  color: #00FF00;
  background: transparent;
  border: 2px solid #00FF00;
  cursor: pointer;
  transition: all 0.3s ease;
  letter-spacing: 4px;
  font-weight: 500;
  text-transform: uppercase;
  position: relative;
  overflow: hidden;
}

.lang-btn:last-child {
  margin-bottom: 0;
}

.lang-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: rgba(0, 255, 0, 0.1);
  transition: left 0.3s ease;
}

.lang-btn:hover::before {
  left: 0;
}

.lang-btn:hover {
  background: rgba(0, 255, 0, 0.15);
  box-shadow:
    0 0 20px rgba(0, 255, 0, 0.5),
    inset 0 0 20px rgba(0, 255, 0, 0.1);
  transform: translateY(-2px);
}

.lang-btn:active {
  transform: scale(0.97);
  box-shadow:
    0 0 10px rgba(0, 255, 0, 0.3),
    inset 0 0 10px rgba(0, 255, 0, 0.2);
  background: rgba(0, 255, 0, 0.25);
}

/* 按钮闪烁提示 */
@keyframes lang-btn-pulse {
  0%, 100% {
    box-shadow: 0 0 5px rgba(0, 255, 0, 0.3);
  }
  50% {
    box-shadow: 0 0 15px rgba(0, 255, 0, 0.5);
  }
}

.lang-btn {
  animation: lang-btn-pulse 2s ease-in-out infinite;
}

/* ========== CRT扫描线效果 ========== */
.lang-select-screen.crt-active::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 255, 0, 0.08) 2px,
    rgba(0, 255, 0, 0.08) 4px
  );
  pointer-events: none;
  z-index: 10;
  animation: lang-scanline-flicker 2s infinite;
}

/* 动态扫描条 */
.lang-select-screen.crt-active::after {
  content: '';
  position: absolute;
  top: -10%;
  left: 0;
  width: 100%;
  height: 10%;
  background: linear-gradient(
    to bottom,
    transparent,
    rgba(0, 255, 0, 0.15),
    transparent
  );
  box-shadow: 0 0 20px rgba(0, 255, 0, 0.3);
  pointer-events: none;
  z-index: 11;
  animation: lang-scanline-move 4s linear infinite;
}

@keyframes lang-scanline-flicker {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.95; }
}

@keyframes lang-scanline-move {
  0% { top: -10%; }
  100% { top: 110%; }
}

/* ========== 淡出动画 ========== */
.lang-select-screen.fade-out {
  animation: lang-fade-out 0.4s forwards;
}

@keyframes lang-fade-out {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    pointer-events: none;
  }
}

/* ========== 淡入动画（返回时使用） ========== */
.lang-select-screen.fade-in {
  animation: lang-fade-in 0.5s forwards;
}

@keyframes lang-fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .lang-title {
    font-size: 20px;
    letter-spacing: 2px;
  }

  .lang-title-sub {
    font-size: 18px;
    margin-bottom: 40px;
  }

  .lang-btn {
    width: 220px;
    padding: 14px 30px;
    font-size: 18px;
    letter-spacing: 2px;
  }

  /* 移动端禁用动态扫描条 */
  .lang-select-screen.crt-active::after {
    display: none;
  }
}

/* ========== 小屏幕 (< 400px) ========== */
@media (max-width: 400px) {
  .lang-select-frame {
    padding: 30px 15px;
  }

  .lang-title {
    font-size: 16px;
    letter-spacing: 1px;
  }

  .lang-title-sub {
    font-size: 14px;
    margin-bottom: 30px;
    letter-spacing: 1px;
  }

  .lang-btn {
    width: 180px;
    padding: 12px 20px;
    font-size: 14px;
    letter-spacing: 1px;
  }
}

/* ========== 超小屏幕 (< 320px) ========== */
@media (max-width: 320px) {
  .lang-title {
    font-size: 14px;
  }

  .lang-title-sub {
    font-size: 12px;
  }

  .lang-btn {
    width: 160px;
    padding: 10px 15px;
    font-size: 12px;
  }
}

/* ========== Smartlink 资源推荐 ========== */
.smartlink-slot {
  margin-top: 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: 'Fira Code', 'Zpix', 'Courier New', monospace;
}

.smartlink-label {
  font-size: 12px;
  color: #6a8a6a;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.smartlink {
  font-size: 14px;
  color: #00ff00;
  text-decoration: underline;
  text-underline-offset: 4px;
  letter-spacing: 1px;
  transition: opacity 0.2s ease;
}

.smartlink:hover {
  opacity: 0.75;
}

@media (max-width: 400px) {
  .smartlink-slot {
    margin-top: 24px;
  }
  .smartlink {
    font-size: 12px;
  }
}

/* ========== 性能优化 ========== */
.lang-select-screen,
.lang-select-frame,
.lang-btn {
  will-change: transform, opacity;
  transform: translateZ(0);
  backface-visibility: hidden;
}

/* ========================================================
   警告界面和耳机建议界面样式
   Warning Screen & Headphone Screen Styles
   ======================================================== */

/* ========== 警告界面容器 ========== */
.warning-screen {
  width: 100vw;
  height: calc(var(--vh, 1vh) * 100);
  display: flex;
  justify-content: center;
  align-items: center;
  background: #051005;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 5800; /* 高于 opening (5000)，略低于 lang-select (6000) */
}

.warning-screen.hidden {
  display: none;
}

.warning-frame {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 60px;
  max-width: 800px;
  text-align: center;
}

.warning-title {
  font-size: 36px;
  color: #00FF00;
  margin-bottom: 40px;
  letter-spacing: 8px;
  font-weight: 700;
  text-shadow:
    0 0 10px #00FF00,
    0 0 20px #00FF00,
    0 0 30px #00FF00;
  font-family: 'Fira Code', 'Zpix', 'Courier New', monospace;
  animation: warning-pulse 2.5s ease-in-out infinite;
}

@keyframes warning-pulse {
  0%, 100% {
    opacity: 1;
    text-shadow:
      0 0 10px #00FF00,
      0 0 20px #00FF00,
      0 0 30px #00FF00;
  }
  50% {
    opacity: 0.92;
    text-shadow:
      0 0 8px #00FF00,
      0 0 15px #00FF00,
      0 0 22px #00FF00;
  }
}

.warning-text {
  font-size: 18px;
  color: #00FF00;
  line-height: 1.8;
  letter-spacing: 1px;
  font-weight: 400;
  text-shadow:
    0 0 5px #00FF00;
  font-family: 'Fira Code', 'Zpix', 'Courier New', monospace;
  opacity: 0.9;
}

/* ========== 耳机建议界面容器 ========== */
.headphone-screen {
  width: 100vw;
  height: calc(var(--vh, 1vh) * 100);
  display: flex;
  justify-content: center;
  align-items: center;
  background: #051005;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 5700; /* 高于 opening (5000)，略低于 warning (5800) */
}

.headphone-screen.hidden {
  display: none;
}

.headphone-frame {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 60px;
  max-width: 700px;
  text-align: center;
}

.headphone-icon {
  font-size: 72px;
  margin-bottom: 40px;
  animation: headphone-glow 2s ease-in-out infinite;
  filter: drop-shadow(0 0 10px #00FF00);
}

@keyframes headphone-glow {
  0%, 100% {
    filter: drop-shadow(0 0 10px #00FF00) drop-shadow(0 0 20px #00FF00);
    transform: scale(1);
  }
  50% {
    filter: drop-shadow(0 0 15px #00FF00) drop-shadow(0 0 30px #00FF00);
    transform: scale(1.05);
  }
}

.headphone-text {
  font-size: 20px;
  color: #00FF00;
  line-height: 1.8;
  letter-spacing: 2px;
  font-weight: 400;
  text-shadow:
    0 0 5px #00FF00,
    0 0 10px #00FF00;
  font-family: 'Fira Code', 'Zpix', 'Courier New', monospace;
}

/* ========== 警告/耳机界面 CRT 扫描线效果 ========== */
.warning-screen.crt-active::before,
.headphone-screen.crt-active::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 255, 0, 0.08) 2px,
    rgba(0, 255, 0, 0.08) 4px
  );
  pointer-events: none;
  z-index: 10;
  animation: lang-scanline-flicker 2s infinite;
}

/* 动态扫描条 */
.warning-screen.crt-active::after,
.headphone-screen.crt-active::after {
  content: '';
  position: absolute;
  top: -10%;
  left: 0;
  width: 100%;
  height: 10%;
  background: linear-gradient(
    to bottom,
    transparent,
    rgba(0, 255, 0, 0.15),
    transparent
  );
  box-shadow: 0 0 20px rgba(0, 255, 0, 0.3);
  pointer-events: none;
  z-index: 11;
  animation: lang-scanline-move 4s linear infinite;
}

/* ========== 淡出动画 ========== */
.warning-screen.fade-out,
.headphone-screen.fade-out {
  animation: warning-fade-out 0.4s forwards;
}

@keyframes warning-fade-out {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    pointer-events: none;
  }
}

/* ========== 淡入动画 ========== */
.warning-screen.fade-in,
.headphone-screen.fade-in {
  animation: warning-fade-in 0.4s forwards;
}

@keyframes warning-fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .warning-title {
    font-size: 24px;
    letter-spacing: 4px;
  }

  .warning-text {
    font-size: 14px;
    padding: 0 20px;
  }

  .headphone-icon {
    font-size: 48px;
  }

  .headphone-text {
    font-size: 16px;
    padding: 0 20px;
  }

  .warning-frame,
  .headphone-frame {
    padding: 40px 20px;
  }

  /* 移动端禁用动态扫描条 */
  .warning-screen.crt-active::after,
  .headphone-screen.crt-active::after {
    display: none;
  }
}

/* ========== 性能优化 ========== */
.warning-screen,
.warning-frame,
.headphone-screen,
.headphone-frame {
  will-change: transform, opacity;
  transform: translateZ(0);
  backface-visibility: hidden;
}