/* ========== 全局基础 ========== */
:root {
  --pink-light: #ffe4ec;
  --pink-mid: #ffb6c8;
  --pink-deep: #ff87a2;
  --pink-dark: #e85d7a;
  --white-pink: #fff5f8;
  --glass-bg: rgba(255, 228, 236, 0.65);
  --glass-border: rgba(255, 255, 255, 0.4);
}

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: linear-gradient(180deg, #fff5f8 0%, #ffe4ec 30%, #fff0f5 60%, #ffe4ec 100%);
  background-attachment: fixed;
  color: #5a3e4b;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ========== 爱心飘落 ========== */
.hearts-container {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.heart-float {
  position: absolute;
  top: -5vh;
  color: var(--pink-mid);
  opacity: 0;
  animation: heartFall linear forwards;
  pointer-events: none;
}

@keyframes heartFall {
  0%   { opacity: 0; transform: translateY(0) rotate(0deg) scale(1); }
  10%  { opacity: 0.7; }
  90%  { opacity: 0.5; }
  100% { opacity: 0; transform: translateY(110vh) rotate(360deg) scale(0.5); }
}

/* ========== 浮动菜单按钮 ========== */
.menu-toggle {
  position: fixed;
  top: 18px;
  left: 18px;
  z-index: 9999;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1.5px solid var(--glass-border);
  box-shadow: 0 4px 20px rgba(255, 135, 162, 0.25);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--pink-deep);
  font-size: 22px;
}

.menu-toggle:hover {
  background: rgba(255, 182, 200, 0.8);
  transform: scale(1.08);
  box-shadow: 0 6px 25px rgba(255, 135, 162, 0.35);
}

.menu-toggle:active { transform: scale(0.95); }

/* ========== 抽屉遮罩 ========== */
.drawer-overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.35);
  z-index: 10000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}

.drawer-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ========== 抽屉导航 ========== */
.drawer-nav {
  position: fixed;
  top: 0; left: 0;
  width: 280px;
  max-width: 80vw;
  height: 100%;
  z-index: 10001;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-right: 1.5px solid var(--glass-border);
  box-shadow: 6px 0 30px rgba(255, 135, 162, 0.15);
  transform: translateX(-100%);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  padding: 0;
}

.drawer-nav.open {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 20px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
}

.drawer-header h5 {
  color: var(--pink-dark);
  font-weight: 600;
  font-size: 18px;
  margin: 0;
}

.drawer-close {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.5);
  color: var(--pink-dark);
  font-size: 18px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all 0.25s;
}

.drawer-close:hover {
  background: rgba(255, 135, 162, 0.3);
  transform: rotate(90deg);
}

.drawer-menu {
  list-style: none;
  padding: 12px 0;
  margin: 0;
  flex: 1;
  overflow-y: auto;
}

.drawer-menu li {
  padding: 0 16px;
}

.drawer-menu a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-radius: 12px;
  color: #7a4e5e;
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: all 0.25s;
}

.drawer-menu a:hover,
.drawer-menu a:active {
  background: rgba(255, 135, 162, 0.18);
  color: var(--pink-dark);
  transform: translateX(4px);
}

.drawer-menu a .nav-icon {
  font-size: 18px;
  flex-shrink: 0;
  width: 24px;
  text-align: center;
}

/* ========== 音乐按钮 ========== */
.music-toggle {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 9999;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1.5px solid var(--glass-border);
  box-shadow: 0 4px 20px rgba(255, 135, 162, 0.25);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--pink-deep);
  font-size: 20px;
}

.music-toggle:hover {
  background: rgba(255, 182, 200, 0.8);
  transform: scale(1.08);
}

.music-toggle.playing {
  animation: musicPulse 1.5s ease-in-out infinite;
}

@keyframes musicPulse {
  0%, 100% { box-shadow: 0 4px 20px rgba(255, 135, 162, 0.25); }
  50% { box-shadow: 0 4px 30px rgba(255, 135, 162, 0.5); }
}

/* ========== 封面首页 ========== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  z-index: 1;
  padding: 60px 20px 40px;
}

.hero-subtitle-top {
  font-size: 15px;
  color: var(--pink-deep);
  letter-spacing: 3px;
  opacity: 0;
  animation: fadeSlideUp 1.2s 0.5s forwards;
}

.hero-title {
  font-size: clamp(32px, 8vw, 56px);
  font-weight: 700;
  color: var(--pink-dark);
  margin: 20px 0 12px;
  opacity: 0;
  animation: fadeSlideUp 1.2s 1s forwards;
  text-shadow: 0 2px 15px rgba(255, 135, 162, 0.2);
}

.hero-subtitle {
  font-size: clamp(16px, 4vw, 22px);
  color: #b07080;
  opacity: 0;
  animation: fadeSlideUp 1.2s 1.5s forwards;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 40px;
  font-size: 13px;
  color: var(--pink-mid);
  letter-spacing: 2px;
  opacity: 0;
  animation: fadeSlideUp 1.2s 2.5s forwards, gentleBounce 2s 3.5s infinite;
}

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes gentleBounce {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(8px); }
}

/* ========== 章节通用 ========== */
.chapter {
  position: relative;
  z-index: 1;
  padding: 80px 0 60px;
}

.chapter-label {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--pink-deep);
  background: rgba(255, 228, 236, 0.7);
  backdrop-filter: blur(8px);
  padding: 6px 18px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.chapter-title {
  font-size: clamp(24px, 6vw, 36px);
  font-weight: 700;
  color: var(--pink-dark);
  margin-bottom: 30px;
}

/* 卡片淡入 */
.fade-card {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-card.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 玻璃卡片 */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 28px 24px;
  box-shadow: 0 8px 32px rgba(255, 135, 162, 0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(255, 135, 162, 0.18);
}

/* ========== 图片 ========== */
.story-img {
  width: 100%;
  border-radius: 16px;
  object-fit: cover;
  box-shadow: 0 6px 24px rgba(255, 135, 162, 0.15);
}

.img-gallery .col-6, .img-gallery .col-4 {
  margin-bottom: 16px;
}

/* ========== 信封 ========== */
.letter-section {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.envelope-wrapper {
  cursor: pointer;
  transition: transform 0.3s;
  width: 100%;
  max-width: 340px;
}

.envelope-wrapper:hover { transform: scale(1.02); }

.envelope {
  position: relative;
  width: 100%;
  aspect-ratio: 4/3;
  perspective: 800px;
}

.envelope-body {
  position: absolute;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #ffe4ec, #fff0f5);
  border-radius: 16px;
  border: 2px solid rgba(255, 182, 200, 0.5);
  box-shadow: 0 8px 30px rgba(255, 135, 162, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.envelope-body .seal-icon {
  font-size: 48px;
  color: var(--pink-deep);
  opacity: 0.8;
}

.envelope-flap {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 50%;
  background: linear-gradient(180deg, #ffc0d0, #ffe4ec);
  border-radius: 16px 16px 0 0;
  border: 2px solid rgba(255, 182, 200, 0.5);
  border-bottom: none;
  transform-origin: top center;
  transition: transform 0.6s ease;
  z-index: 3;
}

.envelope.open .envelope-flap {
  transform: rotateX(180deg);
}

.envelope-hint {
  text-align: center;
  margin-top: 16px;
  font-size: 14px;
  color: var(--pink-mid);
}

.letter-paper {
  display: none;
  background: linear-gradient(180deg, #fff9fb, #fff5f8);
  border-radius: 20px;
  padding: 36px 28px;
  margin-top: 30px;
  max-width: 520px;
  width: 100%;
  box-shadow: 0 8px 35px rgba(255, 135, 162, 0.15);
  border: 1px solid rgba(255, 182, 200, 0.3);
  position: relative;
  line-height: 2;
  font-size: 15px;
  color: #6a4555;
  white-space: pre-line;
}

.letter-paper::before {
  content: '💌';
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 32px;
}

.letter-paper.show {
  display: block;
  animation: fadeSlideUp 0.8s ease forwards;
}

/* ========== 表白板块 ========== */
.confession-section {
  background: linear-gradient(135deg, #ffe4ec, #ffb6c8, #ffc8d8, #ffe4ec);
  background-size: 300% 300%;
  animation: gradientShift 8s ease infinite;
  border-radius: 24px;
  padding: 48px 32px;
  text-align: center;
  box-shadow: 0 10px 40px rgba(255, 135, 162, 0.2);
}

@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.confession-section .confession-title {
  font-size: clamp(22px, 5vw, 32px);
  font-weight: 700;
  color: var(--pink-dark);
  margin-bottom: 24px;
}

.confession-section .confession-text {
  font-size: 16px;
  line-height: 2.2;
  color: #7a4e5e;
  white-space: pre-line;
}

/* ========== 结尾 ========== */
.ending-section {
  text-align: center;
  padding: 80px 20px 60px;
  position: relative;
  z-index: 1;
}

.ending-section h3 {
  font-size: clamp(22px, 5vw, 32px);
  color: var(--pink-dark);
  font-weight: 700;
}

.ending-section p {
  color: #b07080;
  font-size: 15px;
  margin-top: 12px;
}

/* ========== 分割装饰 ========== */
.divider-hearts {
  text-align: center;
  padding: 30px 0;
  color: var(--pink-mid);
  font-size: 22px;
  letter-spacing: 12px;
  opacity: 0.6;
}

/* ========== 响应式 ========== */
@media (max-width: 576px) {
  .glass-card { padding: 22px 18px; }
  .confession-section { padding: 36px 22px; }
  .letter-paper { padding: 28px 20px; font-size: 14px; }
  .drawer-nav { width: 260px; }
  .menu-toggle, .music-toggle { width: 42px; height: 42px; font-size: 18px; }
  .menu-toggle { top: 14px; left: 14px; }
  .music-toggle { top: 14px; right: 14px; }
}

/* ========== 登录屏幕 ========== */
.login-screen {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: linear-gradient(180deg, #fff5f8 0%, #ffe4ec 30%, #fff0f5 60%, #ffe4ec 100%);
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.login-screen.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.login-wrapper {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 460px;
}

.login-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1.5px solid var(--glass-border);
  border-radius: 28px;
  padding: 48px 36px 40px;
  text-align: center;
  box-shadow: 0 12px 48px rgba(255, 135, 162, 0.18);
  animation: cardFadeIn 1s ease forwards;
  opacity: 0;
}

@keyframes cardFadeIn {
  from { opacity: 0; transform: translateY(30px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.login-icon {
  font-size: 56px;
  margin-bottom: 20px;
  animation: iconFloat 3s ease-in-out infinite;
}

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

.login-title {
  font-size: clamp(20px, 5vw, 26px);
  font-weight: 700;
  color: var(--pink-dark);
  margin-bottom: 10px;
  line-height: 1.6;
}

.login-subtitle {
  font-size: 14px;
  color: #b07080;
  margin-bottom: 36px;
}

.login-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.btn-confirm {
  padding: 14px 40px;
  border-radius: 50px;
  border: none;
  background: linear-gradient(135deg, var(--pink-deep), var(--pink-dark));
  color: #fff;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 6px 24px rgba(232, 93, 122, 0.3);
  letter-spacing: 1px;
}

.btn-confirm:hover {
  transform: scale(1.06);
  box-shadow: 0 8px 30px rgba(232, 93, 122, 0.45);
}

.btn-confirm:active {
  transform: scale(0.96);
}

.btn-cancel {
  padding: 14px 40px;
  border-radius: 50px;
  border: 1.5px solid rgba(255, 135, 162, 0.4);
  background: rgba(255, 255, 255, 0.45);
  color: var(--pink-dark);
  font-size: 17px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  letter-spacing: 1px;
}

.btn-cancel:hover {
  border-color: var(--pink-mid);
  background: rgba(255, 228, 236, 0.5);
}

.btn-cancel.shrink-1 { padding: 12px 32px; font-size: 15px; opacity: 0.8; }
.btn-cancel.shrink-2 { padding: 10px 24px; font-size: 13px; opacity: 0.6; }
.btn-cancel.shrink-3 { padding: 8px 16px; font-size: 11px; opacity: 0.45; }
.btn-cancel.shrink-4 { padding: 6px 10px; font-size: 9px; opacity: 0.3; pointer-events: none; }

.login-hint {
  margin-top: 20px;
  font-size: 14px;
  color: var(--pink-deep);
  animation: hintPop 0.5s ease;
}

@keyframes hintPop {
  0%   { opacity: 0; transform: scale(0.8); }
  50%  { transform: scale(1.1); }
  100% { opacity: 1; transform: scale(1); }
}

.login-card.entering {
  animation: cardExit 0.8s ease forwards;
}

@keyframes cardExit {
  0%   { opacity: 1; transform: scale(1); }
  40%  { opacity: 1; transform: scale(1.05); }
  100% { opacity: 0; transform: scale(0.6); }
}

/* ========== 主页内容（初始隐藏） ========== */
.main-content {
  display: none;
}

.main-content.show {
  display: block;
  animation: mainFadeIn 1s ease forwards;
}

@keyframes mainFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@media (max-width: 576px) {
  .login-card { padding: 36px 24px 32px; border-radius: 22px; }
  .login-icon { font-size: 44px; }
  .btn-confirm, .btn-cancel { padding: 12px 32px; font-size: 15px; }
}

/* ========== 视频容器 ========== */
.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: 16px;
  box-shadow: 0 6px 24px rgba(255, 135, 162, 0.15);
}

.video-wrapper video,
.video-wrapper iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: none;
  border-radius: 16px;
}