/* ========== 极简高级风格 ========== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  overflow-y: scroll; /* 强制纵向滚动条占位 */
}

:root {
  /* 极简配色系统 */
  --color-primary: #6366f1;
  --color-primary-hover: #8573f3;
  --color-primary-strong: #4337aa;
  --color-accent: #6bcbce;

  /* 背景色彩 */
  --color-background: #ffffff;
  --color-background-soft: #f8fafc;
  --color-surface: #ffffff;

  /* 文字色彩 */
  --color-text: #474d5a;
  --color-text-strong: #272549;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;

  /* 边框色彩 */
  --color-bubble: #edebfc;
  --color-bubble-hover: #e6e3fa;
  --color-border: #e2e8f0;
  --color-border-hover: #cbd5e1;
  --color-trans: #00000000;

  /* 极简阴影 */
  --shadow-subtle: 0 1px 3px 0 rgb(0 0 0 / 0.05);
  --shadow-minimal: 0 1px 2px 0 rgb(0 0 0 / 0.05);

  /* 圆角系统 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --brightness: 1;
}

[data-theme="dark"] {
  --color-primary: #6366f1;
  --color-primary-hover: #818cf8;
  --color-primary-strong: #4337aa;
  --color-accent: #6bcbce;

  --color-background: #0f172a;
  --color-background-soft: #1e293b;
  --color-surface: #1e293b;

  --color-text: #9391ab;
  --color-text-strong: #d8d8e2;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #64748b;

  --color-border: #334155;
  --color-border-hover: #475569;
  --color-bubble: #162030;
  --color-bubble-hover: #334155;

  --brightness: 0.8;
}

/* ========== 字体系统 ========== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  letter-spacing: -0.01em;
  min-height: 100vh;
}

.center {
  width: fit-content;
  margin: 0 auto;
}

/* ========== 极简头部 ========== */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
  padding: 0;
  background-color: var(--color-background);
  position: sticky;
  top: 0;
  z-index: 100;
}

/* 左侧logo - 极简设计 */
header .info {
  display: flex;
  width: 200px;
  margin-left: 2em;
  align-items: center;
}

.icon img {
  width: 32px;
  height: 32px;
  margin-right: 0.8rem;
  display: block;
}

header .site-name {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--color-text-strong);
  letter-spacing: -0.02em;
}

/* 中间导航 - 极简风格 */
header .navbar {
  display: flex;
  margin: 0 auto;
}

header .navbutton {
  width: 7em;
  display: flex;
  justify-content: center;
  /* 水平居中 */
  align-items: center;
  /* 垂直居中 */
}

header .navbutton a {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 1.25rem;
  font-weight: 400;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

header .navbutton a:hover {
  color: var(--color-primary);
  background-color: var(--color-background-soft);
}

header .navbutton a.active {
  color: var(--color-primary);
  background-color: var(--color-background-soft);
  font-weight: 700;
}

/* 右侧设置 - 极简设计 */
header .setting {
  display: flex;
  width: 230px;
  align-items: center;
  gap: 20px;
}

.theme-switcher {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-background-soft);
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.theme-switcher:hover {
  background-color: var(--color-border);
}

#theme-toggle {
  width: 18px;
  height: 18px;
  opacity: 0.8;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 12px;
  background-color: var(--color-background-soft);
  padding: 6px 12px;
  border-radius: var(--radius-lg);
}

.lang-switch a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.lang-switch a:hover {
  color: var(--color-primary);
}

.lang-switch a.active {
  color: var(--color-primary);
  background-color: var(--color-background);
  font-weight: 600;
}

.lang-switch .sep {
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

/* ========== Flash消息 - 极简版 ========== */
.flash-popup {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  border: 1px solid #f5c2c7;
  background-color: #f8d7da;
  color: #842029;
  padding: 0.5em;
  margin: 0 auto;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  font-size: 1rem;
  opacity: 1;
  transition: opacity 0.5s ease-in-out;
  animation: slideInDown 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(-20px);
  }

  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

.flash-popup.hide {
  animation: slideOutUp 0.3s ease-in-out forwards;
}

@keyframes slideOutUp {
  to {
    opacity: 0;
    transform: translateX(-50%) translateY(-20px);
  }
}

/* ========== 主要内容区域 ========== */
.container {
  max-width: 1000px;
  margin: 0 auto;
}

/* ========== 标题系统 ========== */
h1,
h2,
h3 {
  font-weight: 700;
  color: var(--color-text-strong);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h1 {
  font-size: 3rem;
  text-align: center;
}

h2 {
  font-size: 2rem;
  text-align: center;
}

h3 {
  font-size: 1.5rem;
}

/* ========== 首页英雄区 - 极简版 ========== */
#hero {
  text-align: center;
  padding: 1.5rem 0 4rem;
}

#hi {
  font-size: clamp(4rem, 12vw, 10rem);
  font-weight: 800;
  margin: 0 0 1rem 0;
  background: linear-gradient(135deg,
      var(--color-primary) 30%,
      var(--color-accent) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 40px rgba(99, 102, 241, 0.3);
  animation: titleFloat 6s ease-in-out infinite;
  position: relative;
}

@keyframes titleFloat {

  0%,
  100% {
    transform: translateY(0px);
  }

  50% {
    transform: translateY(-10px);
  }
}

.hero-img {
  display: block;
  max-width: 500px;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  margin: 0 auto;
  transition: transform 0.3s ease;
  transition: all 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  animation: colorShift 30s infinite alternate, imageFloat 8s ease-in-out infinite;

}

.hero-img:hover {
  transform: scale(1.02);
}

@keyframes colorShift {
  0% {
    filter: hue-rotate(0deg) brightness(var(--brightness)) saturate(1.1);
  }

  25% {
    filter: hue-rotate(90deg) brightness(var(--brightness)) saturate(1.2);
  }

  50% {
    filter: hue-rotate(180deg) brightness(var(--brightness)) saturate(1.1);
  }

  75% {
    filter: hue-rotate(270deg) brightness(var(--brightness)) saturate(1.2);
  }

  100% {
    filter: hue-rotate(360deg) brightness(var(--brightness)) saturate(1.1);
  }
}

@keyframes imageFloat {

  0%,
  100% {
    transform: translateY(0px) rotate(0deg);
  }

  33% {
    transform: translateY(-4px) rotate(0.5deg);
  }

  66% {
    transform: translateY(2px) rotate(-0.5deg);
  }
}

/* ========== 表单 - 极简风格 ========== */
#guestbook {
  max-width: 800px;
  margin: 3rem auto;
}

form {
  margin: 2rem 0;
}

input[type="text"],
textarea {
  width: 100%;
  padding: 12px 14px;
  margin-bottom: 20px;
  border-radius: 6px;
  border: 2px solid;
  border-color: var(--color-background-soft);
  background-color: var(--color-background-soft);
  font-size: 1rem;
  color: var(--color-text-strong);
  transition: border 0.2s;
  max-width: 320px;
  display: block;
}

input[type="text"]:hover,
input[type="text"]:focus,
textarea:hover,
textarea:focus {
  outline: none;
  border: 2px solid;
  border-color: var(--color-primary);
  background-color: var(--color-inputarea-hover);
}

input,
textarea {
  caret-color: var(--color-text-light);
}

input::placeholder,
textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 1;
}

textarea {
  resize: none;
  /* 禁止拖动 */
  height: 100px;
  /* 固定高度 */
  max-width: 100%;
}

/* ========== 按钮 - 极简设计 ========== */
button {
  background-color: var(--color-primary);
  border: none;
  color: white;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.2s ease;
}

button:hover {
  background-color: var(--color-primary-hover);
}

button:active {
  transform: translateY(1px);
}

/* ========== 留言板 - 极简版 ========== */
.showmessage {
  background-color: var(--color-background-soft);
  border-radius: 20px;
  padding: 1em;
}

.message-bubble {
  background: var(--color-bubble);
  border-radius: 12px;
  padding: 12px 16px;
  margin-bottom: 16px;
  position: relative;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
  transition: all 0.2s;
}

.message-bubble:hover {
  background: var(--color-bubble-hover);
}

.message-header {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.message-header strong {
  color: var(--color-primary);
  font-weight: 600;
}
@media (max-width: 768px) {
  .timestamp {
    font-size: 0.7rem;
    line-height: 0.7em;
  }
  
}

.message-text {
  white-space: pre-wrap;
  color: var(--color-text);
  line-height: 1.6;
}

.admin-reply {
  padding-left: 16px;
  border-left: 2px solid var(--color-primary);
  background-color: var(--color-trans);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 4px 8px;
}

.admin-name {
  color: var(--color-accent);
  font-weight: 600;
}

/* ========== 分隔线 ========== */
hr {
  width: 75%;
  margin: 1rem auto;
  border: none;
  height: 1px;
  background-color: var(--color-text-muted);
  opacity: 0.3;
  /* 让线条柔和一点 */

}


/* ========== 右下角彩蛋 ========== */
.corner-mark {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  z-index: 999;
  transition: border-color 0.2s ease;
}

.corner-mark:hover {
  border-color: var(--color-primary);
}

.corner-mark a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
}

.corner-mark:hover a {
  color: var(--color-primary);
}

/* ========== 响应式设计 ========== */
@media (max-width: 768px) {
  header {
    flex-direction: column;
    height: auto;
    padding: 1rem;
    gap: 1rem;
  }

  header .navbar {
    gap: 1rem;
  }

  header .navbutton a {
    padding: 6px 12px;
    font-size: 0.9rem;
  }

  .container {
    padding: 2rem 1rem;
  }

  #hi {
    font-size: clamp(2.5rem, 12vw, 4rem);
    margin-bottom: 2rem;
  }

  .hero-img {
    max-width: 300px;
  }

  #guestbook {
    padding: 1rem;
  }

  .showmessage {
    padding: 1.5rem;
  }
}

@media (max-width: 768px) {
  header {
    flex-direction: column;
    height: fit-content;
    position: relative;
  }

  header .info {
    width: fit-content;
    height: 30px;
    margin: 1em auto;
    padding: 0;
  }

  header .navbar {
    flex-wrap: wrap;
    height: 2em;
    justify-content: center;
    gap: 10px;
  }

  header .navbutton {
    width: fit-content;
    height: 2em;
  }

  header .setting {
    display: flex;
    justify-content: flex-end;
    position: absolute;
    top: -0.1rem;
    right: 1rem;
    width: fit-content;
    margin: 0;
    gap: 0;
  }

  .theme-switcher {
    position: relative;
    display: inline-block;
    margin-top: 5px;
    cursor: pointer;
    background-color: var(--color-trans);
  }

  #theme-toggle {
    width: 28px;
    height: 28px;
    vertical-align: middle;
    transition: opacity 0.3s;
  }

  #theme-toggle:hover {
    opacity: 0.7;
  }

  header .setting .lang-switch {
    font-size: 0.95rem;
    background-color: #00000000;
    padding: 0;
    gap: 0;
  }

  header .setting .lang-switch a {
    color: var(--color-text-light);
    text-decoration: none;
    transition: opacity 0.3s;
  }

  header .setting .lang-switch a:hover {
    opacity: 0.7;
    text-decoration: none;
  }

  header .setting .lang-switch a.active {
    font-weight: bold;
    color: var(--color-primary);
  }

  .lang-switch .sep {
    color: var(--color-text-placeholder);
    font-weight: 300;
  }
}

/* ========== 特殊页面 ========== */
.error {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  font-size: 6rem;
  font-weight: 600;
  color: var(--color-primary);
  font-family: "Special Elite", Courier, monospace;
}

.O_o {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  font-size: 20rem;
  font-weight: 600;
  color: var(--color-primary);
  user-select: none;
  cursor: pointer;
  transition: transform 0.3s ease;
}

@media (max-width: 600px) {
  .O_o {
    font-size: 10rem;
  }
  .error {
    font-size: 3rem;
  }
}

/* ========== 管理员表格 ========== */
.admin-table {
  border-collapse: collapse;
  width: 100%;
  max-width: 800px;
  background-color: var(--color-surface);
  overflow: hidden;
}

.admin-table th {
  background-color: var(--color-background-soft);
  color: var(--color-text);
  font-weight: 600;
  padding: 12px;
  text-align: center;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--color-border);
}

.admin-table td {
  padding: 12px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  max-width: 300px;
}

.admin-table tr:hover {
  background-color: var(--color-background-soft);
}

.admin-table .text-cell {
  word-break: break-word;
  white-space: pre-wrap;
  text-align: left;
  line-height: 1.5;
}

/* ========== 微动画 ========== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message-bubble {
  animation: fadeIn 0.3s ease-out;
}

/* ========== 滚动条 ========== */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-background-soft);
}

::-webkit-scrollbar-thumb {
  background: var(--color-bubble-hover);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-hover);
}