@import url("https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;900&family=Noto+Sans+SC:wght@300;400;500;700&display=swap");

:root {
  /* ==================================
     春日微风 色彩引擎 (Spring Breeze Colors)
     ================================== */
  
  /* 画布基色 - 晨间微光白 */
  --bg-canvas: #FCFCFB;
  /* 模块基色 - 略带温度的通透白 */
  --bg-surface: rgba(255, 255, 255, 0.75);
  /* 沉浸式模块色 */
  --bg-surface-solid: #FFFFFF;
  
  /* 品牌核心 - 春木绿系列 (生机盎然而温和) */
  --spring-green: #0EA5E9;       /* 考虑到风的质感，可能青空蓝更合适？不，用户要“春风-春天”，我选一种更生机的绿色 */
  --spring-green-primary: #10B981; /* 翡翠绿/春叶绿: 鲜活、生机 */
  --spring-green-hover: #059669;   /* 深绿：悬停时的沉稳 */
  --spring-green-soft: #D1FAE5;    /* 极浅青绿：底色映衬 */
  --spring-green-glow: rgba(16, 185, 129, 0.25);
  
  /* 辅助色彩 - 迎春与朝阳 */
  --spring-sun: #FEF3C7;           /* 温暖阳光黄 */
  --spring-peach: #FCE7F3;         /* 桃花粉 */
  --spring-sky: #E0F2FE;           /* 春空蓝 */

  /* 字体墨色 - 绝无纯黑，采用有呼吸感的木褐灰 */
  --ink-900: #1C2321;   /* 主标题（极其接近深青褐） */
  --ink-700: #374151;   /* 正文，带有柔软度 */
  --ink-500: #6B7280;   /* 辅助说明 */
  --ink-300: #9CA3AF;   /* 最淡文本 */
  
  /* 边框 - 极致隐形式微光 */
  --border-subtle: rgba(0, 0, 0, 0.04);
  --border-strong: rgba(0, 0, 0, 0.08);
  --border-white: rgba(255, 255, 255, 0.6);
  
  /* ==================================
     空间形制 (Shapes & Shadows)
     ================================== */
  
  /* 圆角 - 有机平滑 (Simulating squircles) */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-xl: 36px;
  --radius-pill: 9999px;
  
  /* 弥散阴影 - 摒弃机械阴影，采用环境发光感 */
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 40px -10px rgba(16, 185, 129, 0.08); /* 带着一丝绿意的高级阴影 */
  --shadow-float: 0 30px 60px -15px rgba(0, 0, 0, 0.06), 0 0 0 1px rgba(255, 255, 255, 0.7) inset;

  /* ==================================
     排版字体 (Typography)
     ================================== */
  --font-sans: "Noto Sans SC", "PingFang SC", system-ui, sans-serif;
  --font-serif: "Noto Serif SC", "STSong", serif;
  
  /* 容器宽度 */
  --page-width: min(1080px, calc(100% - 48px));
  --spring-ease: cubic-bezier(0.25, 1, 0.3, 1);
}

/* ==================================
   全局重置与质感铺底
   ================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-700);
  background-color: var(--bg-canvas);
  background-image: 
    radial-gradient(ellipse at top left, var(--spring-sky) 0%, transparent 40%),
    radial-gradient(circle at bottom right, var(--spring-green-soft) 0%, transparent 60%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.modal-open { overflow: hidden; }

/* 排版节奏 */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif); /* 标题采用优雅灵动的宋体或明朝体 */
  color: var(--ink-900);
  margin: 0;
  line-height: 1.3;
  font-weight: 900;
  letter-spacing: 0.02em;
}

p { margin: 0 0 1em; }
a { color: inherit; text-decoration: none; transition: color 300ms var(--spring-ease); }
button, input, textarea, select { font: inherit; border: none; background: none; color: inherit; outline: none; }
button { cursor: pointer; }
img { max-width: 100%; display: block; border-radius: var(--radius-lg); }
svg { width: 20px; height: 20px; flex-shrink: 0; }

::selection { background: var(--spring-green-soft); color: var(--spring-green-hover); }

/* 自定义滚动条 - 极简 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.1); border-radius: 999px; border: 2px solid var(--bg-canvas); }
::-webkit-scrollbar-thumb:hover { background: rgba(0,0,0,0.2); }

/* 公共容器 */
.page-shell { min-height: 100vh; display: flex; flex-direction: column; }
.page-width { width: var(--page-width); margin: 0 auto; }

/* ==================================
   按钮系统 - 像露珠一样圆润晶莹
   ================================== */
.btn, .btn-outline, .btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 48px;
  padding: 0 28px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-family: var(--font-sans);
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: all 400ms var(--spring-ease);
  position: relative;
  overflow: hidden;
}

/* 主操作按钮：春叶绿 */
.btn {
  background: var(--spring-green-primary);
  color: #FFF;
  box-shadow: 0 8px 20px -6px var(--spring-green-glow);
}
.btn::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(to bottom, rgba(255,255,255,0.2) 0%, transparent 100%);
  opacity: 0;
  transition: opacity 400ms var(--spring-ease);
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px -6px var(--spring-green-glow);
  background: var(--spring-green-hover);
}
.btn:hover::after { opacity: 1; }
.btn:active { transform: translateY(1px); box-shadow: 0 4px 10px -4px var(--spring-green-glow); }

/* 次级柔和按钮：玻璃微透 */
.btn-outline {
  background: rgba(255, 255, 255, 0.4);
  color: var(--ink-700);
  border: 1px solid var(--border-white);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.02);
}
.btn-outline:hover {
  background: rgba(255, 255, 255, 0.8);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.04);
  color: var(--spring-green-hover);
}

.btn-ghost {
  color: var(--ink-500);
  height: auto;
  padding: 8px 16px;
  background: transparent;
}
.btn-ghost:hover { color: var(--spring-green-primary); background: rgba(0,0,0,0.03); }

/* 圆形小图标按钮 */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  color: var(--ink-500);
  background: transparent;
  transition: all 300ms var(--spring-ease);
}
.icon-btn:hover {
  background: rgba(255,255,255,0.6);
  color: var(--spring-green-primary);
  box-shadow: var(--shadow-sm);
  transform: scale(1.05);
}

/* 旧标签兼容 */
.button { }
.button-secondary { }

/* ==================================
   表单系统 - 气泡与呼吸般
   ================================== */
.input, .textarea, .select {
  width: 100%;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--ink-900);
  font-family: var(--font-sans);
  font-size: 15px;
  transition: all 400ms var(--spring-ease);
  box-shadow: inset 0 2px 6px rgba(0,0,0,0.01);
}
.input, .select { height: 54px; padding: 0 20px; }
.textarea { min-height: 120px; padding: 20px; resize: vertical; }

.input::placeholder, .textarea::placeholder { color: var(--ink-300); }
.input:hover, .textarea:hover, .select:hover {
  background: rgba(255,255,255,0.9);
  border-color: rgba(16, 185, 129, 0.3);
}
.input:focus, .textarea:focus, .select:focus {
  background: #FFF;
  border-color: var(--spring-green-primary);
  box-shadow: 0 0 0 4px var(--spring-green-soft), inset 0 2px 4px rgba(0,0,0,0.02);
}

.label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--ink-500);
  font-weight: 500;
}
.label span { padding-left: 4px; }

.stack { display: grid; gap: 24px; }
.split { display: grid; gap: 16px; grid-template-columns: repeat(2, minmax(0, 1fr)); }

/* ==================================
   徽章与标签 - 轻盈如落花
   ================================== */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 28px;
  padding: 0 12px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-family: var(--font-sans);
  font-weight: 600;
  background: rgba(255,255,255,0.7);
  color: var(--ink-500);
  border: 1px solid var(--border-white);
  box-shadow: 0 2px 6px rgba(0,0,0,0.02);
  white-space: nowrap;
  flex-shrink: 0;
}
.pill.active {
  background: var(--spring-green-soft);
  color: var(--spring-green-hover);
  border-color: rgba(16, 185, 129, 0.2);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  color: var(--ink-500);
}
.tag svg { width: 16px; height: 16px; opacity: 0.7; }

/* ==================================
   抽象组件 - 春风毛玻璃 (Glassmorphism)
   ================================== */
.glass-pane {
  background: var(--bg-surface);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 40px;
}

/* ==================================
   引导装饰文本 (Eyebrow & Section Titles)
   ================================== */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  font-family: var(--font-sans);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--spring-green-primary);
  opacity: 0.8;
}
.eyebrow::before, .eyebrow::after {
  content: "";
  height: 1px;
  width: 24px;
  background: currentColor;
  opacity: 0.3;
}

/* ==================================
   品牌 Lockup
   ================================== */
.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 16px;
}
.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--spring-green-soft) 0%, var(--spring-sky) 100%);
  color: var(--spring-green-hover);
  font-size: 24px;
  font-family: var(--font-serif);
  font-weight: 900;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.15), inset 0 2px 4px rgba(255,255,255,0.8);
}
.brand-copy { display: flex; flex-direction: column; }
.brand-copy strong {
  font-size: 20px;
  font-family: var(--font-serif);
  color: var(--ink-900);
  font-weight: 900;
  line-height: 1;
}
.brand-copy small {
  font-size: 12px;
  color: var(--ink-500);
  margin-top: 4px;
  font-family: var(--font-sans);
  letter-spacing: 0.04em;
}

/* ==================================
   空状态与加载 (Float in the air)
   ================================== */
.loading-state, .error-state, .empty-state {
  min-height: 50vh;
  display: grid;
  place-items: center;
  padding: 40px;
}
.loading-card, .error-card, .empty-card {
  text-align: center;
  max-width: 400px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  animation: float 6s ease-in-out infinite;
}
.empty-card strong {
  font-family: var(--font-serif);
  font-size: 24px;
  color: var(--ink-900);
}
.empty-card p {
  color: var(--ink-500);
  font-size: 15px;
}

/* ==================================
   悬浮式弹窗 (Floating Modals)
   ================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(252, 252, 251, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: grid;
  place-items: center;
  padding: 20px;
  animation: fadeIn 400ms var(--spring-ease);
}
.modal-card {
  width: min(600px, 100%);
  background: #FFF;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-float);
  padding: 48px;
  border: 1px solid rgba(255,255,255,0.8);
  transform-origin: center;
  animation: popIn 500ms var(--spring-ease) forwards;
}

/* ==================================
   提示消息 (Toasts)
   ================================== */
.toast-stack {
  position: fixed;
  right: 32px;
  bottom: 32px;
  z-index: 300;
  display: grid;
  gap: 12px;
}
.toast {
  min-width: 300px;
  padding: 16px 24px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px);
  color: var(--ink-900);
  font-size: 14px;
  font-family: var(--font-sans);
  font-weight: 500;
  box-shadow: 0 10px 40px rgba(0,0,0,0.08);
  border: 1px solid var(--border-white);
  animation: slideInUp 600ms var(--spring-ease) forwards;
}
.toast.error {
  background: #FEF2F2;
  color: #DC2626;
  border-color: #FECACA;
}

/* ==================================
   头像 - 天然水滴印
   ================================== */
.avatar-cluster { display: flex; align-items: center; }
.avatar-cluster span {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--spring-green-hover);
  background: #FFF;
  border: 2px solid var(--bg-canvas);
  margin-left: -10px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}
.avatar-cluster span:first-child { margin-left: 0; }

.hidden { display: none !important; }

/* ==================================
   全局春风动画 (Breeze Animations)
   ================================== */
@keyframes revealUp {
  from { opacity: 0; transform: translateY(40px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes fadeIn {
  from { opacity: 0; backdrop-filter: blur(0px); }
  to { opacity: 1; backdrop-filter: blur(8px); }
}
@keyframes slideInUp {
  from { opacity: 0; transform: translateY(20px) scale(0.9); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes popIn {
  from { opacity: 0; transform: translateY(20px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

.reveal-up { opacity: 0; animation: revealUp 800ms var(--spring-ease) forwards; }
.reveal-up.delay-1 { animation-delay: 150ms; }
.reveal-up.delay-2 { animation-delay: 300ms; }
.reveal-up.delay-3 { animation-delay: 450ms; }
.reveal-up.delay-4 { animation-delay: 600ms; }

@media (max-width: 768px) {
  .page-width { width: 100%; padding: 0 24px; }
  .split { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}