:root {
  --bg-dark: #0505058c;
  --text-main: #f0f0f0;
  --text-muted: #888888;
  --gold-accent: #d4af37; /* 奢华金 */
  --font-serif: 'Playfair Display', serif;
  --font-sans: 'Inter', sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  height: 100vh;
  width: 100vw;
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  overflow: hidden; /* 禁止滚动，保持全屏沉浸 */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* === 1. 电影感动态背景 (模拟深海/极光) === */
.cinematic-bg {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: linear-gradient(180deg, #036c36 0%, #79eb0754 100%);
  z-index: -2; 
  overflow: hidden;
}

.wave {
  position: absolute;
  bottom: -20%;
  left: -20%;
  width: 150%;
  height: 150%;
  background: radial-gradient(circle at 50% 50%, rgba(45, 55, 100, 0.4), transparent 60%);
  filter: blur(80px);
  animation: drift 15s infinite ease-in-out alternate;
  opacity: 0.6;
}

.wave:nth-child(2) {
  top: -30%;
  right: -20%;
  left: auto;
  bottom: auto;
  background: radial-gradient(circle at 50% 50%, rgba(60, 80, 120, 0.3), transparent 70%);
  animation-duration: 20s;
  animation-delay: -5s;
}

/* 噪点滤镜 - 增加胶片质感 */
.noise-overlay {
  position: fixed;
  inset: 0;
  /* background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.05'/%3E%3C/svg%3E"); */
  pointer-events: none;
  z-index: -1;
}

@keyframes drift {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(20px, 40px) scale(1.1); }
}

/* === 2. 主舞台布局 === */
.stage {
  width: 100%;
  max-width: 1200px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  padding: 20px;
}

/* === 3. 字体设计 (The Eras 风格) === */
.hero-text {
  text-align: center;
  margin-bottom: 3rem;
  animation: fadeInSlow 1.5s ease-out;
}

.subtitle {
  font-size: 0.8rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.title {
  font-family: var(--font-serif);
  font-size: 5rem; /* 巨大标题 */
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.02em;
  background: linear-gradient(to bottom, #ffffff, #aaaaaa);
  -webkit-background-clip: text;
  color: transparent;
  margin-bottom: 1rem;
}

.title em {
  font-style: italic;
  font-weight: 300;
  color: #fff; /* 或设为淡金色 */
}

.description {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 300;
}

/* === 4. 极简交互区 (去盒子化) === */
.interaction-zone {
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: slideUp 1s ease-out 0.3s backwards;
}

/* 导航 */
.tabs-nav {
  margin-bottom: 40px;
  display: flex;
  align-items: center;
  gap: 15px;
}

.nav-btn {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.4);
  font-size: 1rem;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: color 0.3s;
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
}

.nav-btn.active {
  color: #fff;
  border-bottom-color: #fff;
}

.divider { color: rgba(255, 255, 255, 0.2); }

/* 面板切换 */
.content-panel { display: none; width: 100%; }
.content-panel.show { display: block; animation: fadeIn 0.5s ease; }

/* === 5. 极简表单 (Floating Labels) === */
.minimal-form {
  display: flex;
  flex-direction: column;
  gap: 25px;
}

.input-line {
  position: relative;
  width: 100%;
}

.input-line input {
  width: 100%;
  padding: 10px 0;
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  color: #fff;
  font-size: 1.1rem;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color 0.3s;
}

.input-line input:focus {
  border-bottom-color: #fff;
}

/* 浮动标签动画 */
.floating-label {
  position: absolute;
  left: 0;
  top: 10px;
  color: rgba(255, 255, 255, 0.5);
  pointer-events: none;
  transition: 0.3s ease all;
  font-size: 1rem;
}

.input-line input:focus ~ .floating-label,
.input-line input:not(:placeholder-shown) ~ .floating-label {
  top: -14px;
  font-size: 0.75rem;
  color: var(--gold-accent);
  letter-spacing: 1px;
}

/* 按钮设计 */
.cta-btn {
  width: 100%;
  padding: 16px;
  margin-top: 20px;
  background: #fff;
  color: #000;
  border: none;
  font-family: var(--font-sans);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.3s;
}

.cta-btn:hover {
  background: #e0e0e0;
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.3);
}

.cta-btn.outline {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
}
.cta-btn.outline:hover {
  border-color: #fff;
}

/* 验证码区域 */
.code-section {
  display: flex;
  gap: 15px;
  align-items: flex-end;
  margin-top: 20px;
}
.hidden { display: none !important; }

.status-msg {
  text-align: center;
  font-size: 0.85rem;
  margin-top: 20px;
  color: var(--gold-accent);
  min-height: 1.5em;
}

/* 底部 */
.legal-foot {
  position: absolute;
  bottom: 30px;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.3);
  letter-spacing: 0.05em;
}

.legal-foot a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* 响应式调整 */
@media (max-width: 768px) {
  .title { font-size: 3.5rem; }
  .interaction-zone { max-width: 320px; }
}

/* 动画定义 */
@keyframes fadeInSlow {
  from { opacity: 0; filter: blur(10px); }
  to { opacity: 1; filter: blur(0); }
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; } to { opacity: 1; }
}