/* ===========================================================
   BIRTHDAY PAGE - 高级 Sci-Fi 主题样式
   =========================================================== */

/* === 基础样式 === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  background: #0a0a1a;
  color: #e4e4e4;
  overflow-x: hidden;
}

/* 粒子背景 */
#particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* 页面容器 */
.page {
  position: relative;
  opacity: 1;
  visibility: visible;
  z-index: 1;
  transition: opacity 0.8s ease, visibility 0.8s ease;
}

.page.hidden {
  opacity: 0;
  visibility: hidden;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  min-height: 100vh;
}

/* ===========================================================
   HERO SECTION
   =========================================================== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  padding: 2rem;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(88, 40, 180, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 50%, rgba(0, 180, 255, 0.1) 0%, transparent 50%),
    linear-gradient(180deg, #0a0a1a 0%, #0f1628 50%, #0a0a1a 100%);
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 150px;
  background: linear-gradient(to bottom, transparent, #0a0a1a);
  pointer-events: none;
}

/* 主标题 */
.hero-title {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 800;
  letter-spacing: 0.05em;
  background: linear-gradient(135deg, #00d4ff 0%, #7b2cbf 40%, #ff6b9d 70%, #00d4ff 100%);
  background-size: 300% 300%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: hero-gradient 6s ease infinite;
  margin-bottom: 0.5rem;
}

@keyframes hero-gradient {
  0%, 100% { background-position: 0% 50%; }
  25% { background-position: 100% 0%; }
  50% { background-position: 100% 50%; }
  75% { background-position: 0% 100%; }
}

.hero-subtitle {
  font-size: clamp(1rem, 3vw, 1.3rem);
  color: rgba(200, 200, 220, 0.7);
  font-weight: 300;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  margin-bottom: 3rem;
}

/* 滚动提示 */
.scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(200, 200, 220, 0.4);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  animation: scroll-bounce 2s ease-in-out infinite;
  z-index: 5;
}

.scroll-hint .arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid rgba(200, 200, 220, 0.4);
  border-bottom: 2px solid rgba(200, 200, 220, 0.4);
  transform: rotate(45deg);
}

@keyframes scroll-bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

/* ===========================================================
   SVG 生日蛋糕
   =========================================================== */
.cake-section {
  display: flex;
  justify-content: center;
  margin-bottom: 2rem;
}

.cake-svg {
  width: clamp(160px, 40vw, 260px);
  height: auto;
  filter: drop-shadow(0 10px 30px rgba(0, 180, 255, 0.15));
}

/* 蜡烛火焰 */
@keyframes flame-dance {
  0%, 100% { transform: scaleY(1) scaleX(1) rotate(-1deg); opacity: 1; }
  25% { transform: scaleY(1.1) scaleX(0.9) rotate(2deg); }
  50% { transform: scaleY(0.95) scaleX(1.05) rotate(-2deg); }
  75% { transform: scaleY(1.05) scaleX(0.95) rotate(1deg); }
}

.flame-group {
  animation: flame-dance 0.4s ease-in-out infinite alternate;
  transform-origin: center bottom;
}

@keyframes glow-pulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.6; }
}

.flame-glow {
  animation: glow-pulse 1.5s ease-in-out infinite;
}

/* ===========================================================
   内容区域
   =========================================================== */
.content-section {
  position: relative;
  z-index: 2;
  background: #0a0a1a;
}

.section {
  max-width: 700px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.section-divider {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, transparent, #7b2cbf, transparent);
  margin: 0 auto 3rem;
}

/* 祝福语区块 */
.blessing-section {
  text-align: center;
}

.blessing-title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
  color: #e0e0f0;
  margin-bottom: 1.5rem;
}

.blessing-text {
  font-size: 1.05rem;
  line-height: 2;
  color: rgba(200, 200, 220, 0.75);
  max-width: 500px;
  margin: 0 auto;
}

/* 时间线区块 */
.timeline-section {
  padding-top: 2rem;
}

.timeline-title {
  text-align: center;
  font-size: clamp(1.3rem, 3.5vw, 1.8rem);
  font-weight: 600;
  color: #e0e0f0;
  margin-bottom: 3rem;
}

.timeline {
  position: relative;
  padding-left: 30px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, #7b2cbf, #00d4ff, #ff6b9d);
}

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
  padding-left: 20px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -34px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #7b2cbf;
  border: 2px solid #0a0a1a;
  box-shadow: 0 0 10px rgba(123, 44, 191, 0.5);
}

.timeline-year {
  font-size: 0.85rem;
  color: #00d4ff;
  font-weight: 600;
  letter-spacing: 0.1em;
  margin-bottom: 0.3rem;
}

.timeline-desc {
  font-size: 0.95rem;
  color: rgba(200, 200, 220, 0.65);
  line-height: 1.6;
}

/* ===========================================================
   异常 / 故障元素
   =========================================================== */

/* 异常文字块 - 持久存在 */
.glitch-block {
  margin-top: 2rem;
  padding: 1.5rem 2rem;
  background: rgba(255, 0, 64, 0.03);
  border: 1px solid rgba(255, 0, 64, 0.15);
  border-radius: 4px;
  cursor: pointer;
  user-select: none;
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
}

.glitch-block:hover {
  border-color: rgba(255, 0, 64, 0.4);
  background: rgba(255, 0, 64, 0.08);
  box-shadow: 0 0 20px rgba(255, 0, 64, 0.1);
}

.glitch-block .normal-text {
  font-size: 0.9rem;
  color: rgba(200, 200, 220, 0.6);
  line-height: 1.8;
  transition: all 0.15s;
}

.glitch-block .glitch-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1.5rem 2rem;
  opacity: 0;
  background: rgba(10, 10, 26, 0.92);
  font-family: 'Courier New', 'Fira Code', monospace;
  font-size: 0.75rem;
  color: #ff0040;
  line-height: 1.8;
  pointer-events: none;
  transition: opacity 0.15s;
}

/* 闪烁时显示 overlay */
.glitch-block.flash .glitch-overlay {
  opacity: 1;
  animation: glitch-shake 0.4s ease;
}

@keyframes glitch-shake {
  0% { transform: translate(0); opacity: 0; }
  10% { transform: translate(-3px, 2px); opacity: 1; }
  20% { transform: translate(3px, -1px); }
  30% { transform: translate(-2px, 1px); }
  40% { transform: translate(2px, -2px); }
  50% { transform: translate(-1px, 1px); }
  60% { transform: translate(1px, 0); opacity: 0.8; }
  100% { opacity: 0; transform: translate(0); }
}

/* 随机故障 - 文字腐蚀 */
.corrupted {
  position: relative;
  display: inline;
}

.corrupted::after {
  content: attr(data-glitch);
  position: absolute;
  top: 0;
  left: 2px;
  color: #ff0040;
  opacity: 0;
  pointer-events: none;
}

.corrupted.active::after {
  animation: text-corrupt 0.15s steps(2) infinite;
  opacity: 0.8;
}

@keyframes text-corrupt {
  0% { opacity: 0; transform: translate(0); }
  25% { opacity: 0.8; transform: translate(-2px, 1px); }
  50% { opacity: 0; }
  75% { opacity: 0.6; transform: translate(2px, -1px); }
  100% { opacity: 0; transform: translate(0); }
}

/* 隐藏的系统状态线 */
.system-line {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 2rem 0;
  opacity: 0.25;
  transition: opacity 0.3s;
}

.system-line:hover {
  opacity: 0.6;
}

.system-line .line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 255, 65, 0.3), transparent);
}

.system-line .status {
  font-family: 'Courier New', monospace;
  font-size: 0.65rem;
  color: #00ff41;
  letter-spacing: 0.15em;
  white-space: nowrap;
}

/* 底部提示 */
.terminal-hint {
  text-align: center;
  padding: 3rem 2rem;
  position: relative;
}

.terminal-hint p {
  font-family: 'Courier New', monospace;
  font-size: 0.8rem;
  color: rgba(0, 255, 65, 0.25);
  letter-spacing: 0.2em;
  animation: hint-pulse 4s ease-in-out infinite;
}

@keyframes hint-pulse {
  0%, 100% { opacity: 0.15; }
  50% { opacity: 0.4; }
}

/* ===========================================================
   气球 - 高级浮动动画
   =========================================================== */
.balloons-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

.balloon {
  position: absolute;
  bottom: -120px;
  width: clamp(30px, 6vw, 45px);
  height: clamp(38px, 7.5vw, 56px);
  border-radius: 50% 50% 50% 50% / 40% 40% 60% 60%;
  opacity: 0;
  animation: elegant-float linear infinite;
  filter: blur(0.3px);
}

.balloon::before {
  content: '';
  position: absolute;
  top: 15%;
  left: 20%;
  width: 30%;
  height: 25%;
  background: radial-gradient(ellipse, rgba(255, 255, 255, 0.5), transparent);
  border-radius: 50%;
  transform: rotate(-30deg);
}

.balloon::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 6px solid inherit;
}

.balloon .string {
  position: absolute;
  bottom: -40px;
  left: 50%;
  width: 1px;
  height: 35px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.3), transparent);
  transform: translateX(-50%);
}

.balloon-1 {
  background: linear-gradient(135deg, #c4788a, #a85568);
  animation-duration: 18s;
  animation-delay: 0s;
  left: 8%;
}
.balloon-1::after { border-top-color: #a85568; }

.balloon-2 {
  background: linear-gradient(135deg, #7ba4a0, #5d8a86);
  animation-duration: 22s;
  animation-delay: -5s;
  left: 25%;
}
.balloon-2::after { border-top-color: #5d8a86; }

.balloon-3 {
  background: linear-gradient(135deg, #8b7ec8, #6d5fb0);
  animation-duration: 20s;
  animation-delay: -10s;
  left: 50%;
}
.balloon-3::after { border-top-color: #6d5fb0; }

.balloon-4 {
  background: linear-gradient(135deg, #c8a87e, #b08d60);
  animation-duration: 25s;
  animation-delay: -3s;
  left: 75%;
}
.balloon-4::after { border-top-color: #b08d60; }

.balloon-5 {
  background: linear-gradient(135deg, #9bb5a0, #7d9d82);
  animation-duration: 19s;
  animation-delay: -14s;
  left: 90%;
}
.balloon-5::after { border-top-color: #7d9d82; }

@keyframes elegant-float {
  0% {
    transform: translateY(0) translateX(0) rotate(0deg);
    opacity: 0;
  }
  5% { opacity: 0.6; }
  15% { opacity: 0.7; }
  50% {
    transform: translateY(-55vh) translateX(15px) rotate(3deg);
    opacity: 0.65;
  }
  85% { opacity: 0.5; }
  95% { opacity: 0; }
  100% {
    transform: translateY(-110vh) translateX(-10px) rotate(-2deg);
    opacity: 0;
  }
}

/* ===========================================================
   页面过渡
   =========================================================== */
.page-glitch {
  animation: full-glitch 0.6s ease forwards;
}

@keyframes full-glitch {
  0% { filter: none; transform: none; }
  10% { filter: hue-rotate(90deg); transform: translate(-8px, 3px); }
  20% { filter: hue-rotate(180deg) saturate(2); transform: translate(6px, -2px); }
  30% { filter: hue-rotate(270deg); transform: translate(-4px, -3px); }
  40% { filter: invert(0.1); transform: translate(4px, 2px); }
  50% { filter: hue-rotate(45deg) blur(1px); transform: translate(-2px, 1px); }
  60% { filter: saturate(3) contrast(1.5); transform: translate(3px, -1px); }
  70% { filter: hue-rotate(90deg); transform: translate(-1px, 2px); }
  80% { filter: none; transform: translate(2px, 0); }
  90% { transform: translate(-1px, 0); }
  100% { filter: none; transform: none; opacity: 0; }
}

/* ===========================================================
   崩溃覆盖层（滚动到底部时触发）
   =========================================================== */
.crash-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #000;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease;
}

.crash-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.crash-content {
  font-family: 'Courier New', 'Fira Code', monospace;
  color: #ff0040;
  font-size: clamp(0.7rem, 2.5vw, 0.9rem);
  max-width: 600px;
  width: 90%;
  padding: 2rem;
  text-align: left;
}

.crash-title {
  font-size: clamp(1.2rem, 4vw, 1.8rem);
  font-weight: bold;
  color: #ff0040;
  text-align: center;
  margin-bottom: 1.5rem;
  animation: crash-pulse 0.5s ease-in-out infinite alternate;
}

@keyframes crash-pulse {
  0% { opacity: 0.7; text-shadow: 0 0 10px rgba(255, 0, 64, 0.5); }
  100% { opacity: 1; text-shadow: 0 0 30px rgba(255, 0, 64, 0.9); }
}

.crash-lines div {
  margin: 4px 0;
  line-height: 1.6;
}

.crash-warn {
  color: #ff6600;
  font-weight: bold;
  animation: warn-blink 0.8s step-end infinite;
}

@keyframes warn-blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0.3; }
}

.crash-pause {
  margin: 12px 0 !important;
  animation: none !important;
}

.crash-loader {
  color: #00ff41;
  margin-top: 10px;
  animation: loader-flicker 0.3s steps(1) infinite;
}

@keyframes loader-flicker {
  0%, 90% { opacity: 1; }
  95% { opacity: 0.5; }
  100% { opacity: 1; }
}

.stack-indent {
  padding-left: 20px;
  color: rgba(255, 0, 64, 0.6);
}

/* ===========================================================
   滚动触发的渐进 Glitch 效果
   =========================================================== */

/* 全局 glitch 蒙版 - 随滚动增强 */
.glitch-scanline {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 50;
  opacity: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent 0px,
    transparent 2px,
    rgba(255, 0, 64, 0.03) 2px,
    rgba(255, 0, 64, 0.03) 4px
  );
  mix-blend-mode: screen;
}

.glitch-scanline.active {
  animation: scanline-flicker 0.1s steps(3) infinite;
}

@keyframes scanline-flicker {
  0% { opacity: 0.3; }
  33% { opacity: 0.5; }
  66% { opacity: 0.2; }
  100% { opacity: 0.4; }
}

/* 色块 glitch */
.glitch-chunk {
  position: fixed;
  background: rgba(255, 0, 64, 0.08);
  pointer-events: none;
  z-index: 49;
  opacity: 0;
  mix-blend-mode: screen;
}

/* ===========================================================
   响应式
   =========================================================== */
@media (max-width: 768px) {
  .section { padding: 3rem 1.5rem; }
  .timeline { padding-left: 25px; }
  .timeline-item { padding-left: 15px; }
  .timeline-item::before { left: -29px; }
  .glitch-block { padding: 1.2rem 1.5rem; }
  .glitch-block .glitch-overlay { padding: 1.2rem 1.5rem; }
  .crash-content { font-size: 0.65rem; padding: 1.2rem; }
}

@media (max-width: 480px) {
  .hero { min-height: 90vh; padding: 1.5rem; }
  .section { padding: 2.5rem 1.2rem; }
  .hero-subtitle { letter-spacing: 0.15em; font-size: 0.85rem; }
  .balloon { width: 28px; height: 36px; }
}