/* ===== 三角洲行动攻略站 - 主样式系统 ===== */
/* 设计风格：Military Tactical Tech（军事科技风） */

/* ===== 1. Settings - CSS变量系统 ===== */
:root {
  /* 色彩系统 - Military Palette */
  --color-bg-primary: #0a0f0d;
  --color-bg-secondary: #141f1a;
  --color-bg-tertiary: #1a2f23;
  --color-accent: #00ff41;
  --color-accent-dim: rgba(0, 255, 65, 0.15);
  --color-accent-glow: rgba(0, 255, 65, 0.4);
  --color-warning: #ffd700;
  --color-danger: #ff3333;
  --color-info: #00bfff;
  --color-text-primary: #e0e0e0;
  --color-text-secondary: #8a8a8a;
  --color-text-muted: #555555;
  --color-border: #1a2f23;
  --color-border-accent: rgba(0, 255, 65, 0.3);

  /* 字体系统 */
  --font-display: 'Orbitron', 'Rajdhani', sans-serif;
  --font-body: 'Share Tech Mono', 'Roboto Mono', monospace;
  --font-data: 'Chakra Petch', monospace;

  /* 间距系统 */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* 字体大小 */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3rem;

  /* 圆角 */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;

  /* 过渡动画 */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* 阴影 */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--color-accent-glow);

  /* 层级 */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-tooltip: 600;

  /* 容器宽度 */
  --container-max: 1400px;
  --container-narrow: 900px;
}

/* ===== 2. Generic - CSS重置 ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* 扫描线效果 - 全局叠加层 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 255, 65, 0.01) 2px,
    rgba(0, 255, 65, 0.01) 4px
  );
  opacity: 0.4;
}

/* 网格背景图案 */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  background-image:
    linear-gradient(rgba(0, 255, 65, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 65, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
}

/* ===== 3. Elements - 元素基础样式 ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-info);
  text-shadow: 0 0 8px var(--color-accent-glow);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

button {
  font-family: var(--font-body);
  cursor: pointer;
  border: none;
  background: none;
  font-size: inherit;
}

input, textarea, select {
  font-family: var(--font-body);
  font-size: var(--text-base);
}

/* ===== 4. Objects - 布局对象 ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.section {
  padding: var(--space-3xl) 0;
}

.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ===== 5. Components - 组件样式 ===== */

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background: rgba(10, 15, 13, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: rgba(10, 15, 13, 0.98);
  box-shadow: var(--shadow-lg);
}

.navbar__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar__logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 900;
  color: var(--color-accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-shadow: 0 0 10px var(--color-accent-glow);
}

.navbar__logo-icon {
  width: 32px;
  height: 32px;
  fill: var(--color-accent);
  filter: drop-shadow(0 0 8px var(--color-accent-glow));
}

.navbar__menu {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
}

.navbar__link {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--space-sm) var(--space-md);
  position: relative;
  transition: all var(--transition-fast);
}

.navbar__link:hover,
.navbar__link.active {
  color: var(--color-accent);
}

.navbar__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--color-accent);
  box-shadow: 0 0 8px var(--color-accent-glow);
  transition: width var(--transition-base);
}

.navbar__link:hover::after,
.navbar__link.active::after {
  width: 80%;
}

/* 汉堡菜单按钮（移动端） */
.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-sm);
}

.navbar__toggle-bar {
  width: 28px;
  height: 2px;
  background: var(--color-accent);
  transition: all var(--transition-base);
  box-shadow: 0 0 4px var(--color-accent-glow);
}

/* 按钮组件 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border: 1px solid var(--color-border-accent);
  background: transparent;
  color: var(--color-accent);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    var(--color-accent-dim),
    transparent
  );
  transition: left var(--transition-slow);
}

.btn:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow), inset 0 0 20px var(--color-accent-dim);
  transform: translateY(-2px);
}

.btn:hover::before {
  left: 100%;
}

.btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-md), inset 0 0 10px rgba(0, 0, 0, 0.5);
}

.btn--primary {
  background: var(--color-accent-dim);
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: rgba(0, 255, 65, 0.25);
}

.btn--danger {
  color: var(--color-danger);
  border-color: rgba(255, 51, 51, 0.3);
}

.btn--danger:hover {
  border-color: var(--color-danger);
  box-shadow: 0 0 20px rgba(255, 51, 51, 0.4);
}

.btn--lg {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--text-base);
}

/* 卡片组件 */
.card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--color-accent),
    transparent
  );
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  border-color: var(--color-border-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(0, 255, 65, 0.08);
}

.card:hover::before {
  opacity: 1;
}

.card__header {
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.card__title {
  font-size: var(--text-lg);
  margin-bottom: 0;
}

.card__body {
  color: var(--color-text-secondary);
}

.card__footer {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* 标签/Tag组件 */
.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
  background: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  border-left: 3px solid var(--color-accent);
}

.tag--beginner { border-left-color: #00ff41; color: #00ff41; }
.tag--intermediate { border-left-color: #ffd700; color: #ffd700; }
.tag--advanced { border-left-color: #ff8c00; color: #ff8c00; }
.tag--expert { border-left-color: #ff3333; color: #ff3333; }
.tag--new {
  background: rgba(0, 255, 65, 0.15);
  color: var(--color-accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* 输入框组件 */
.input-group {
  margin-bottom: var(--space-md);
}

.input {
  width: 100%;
  padding: var(--space-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-bottom: 2px solid transparent;
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  border-radius: var(--radius-sm);
  outline: none;
  transition: all var(--transition-base);
}

.input:focus {
  border-color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  box-shadow: 0 0 20px var(--color-accent-dim);
}

.input::placeholder {
  color: var(--color-text-muted);
  font-style: italic;
}

/* 表格组件 */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-data);
  font-size: var(--text-sm);
}

.table th {
  background: var(--color-bg-tertiary);
  color: var(--color-accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-md);
  text-align: left;
  border-bottom: 2px solid var(--color-accent);
}

.table td {
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.table tbody tr:nth-child(even) {
  background: rgba(26, 47, 35, 0.3);
}

.table tbody tr:hover {
  background: var(--color-accent-dim);
  color: var(--color-text-primary);
}

/* 进度条组件 */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
}

.progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), #00cc33);
  border-radius: var(--radius-sm);
  transition: width var(--transition-slow);
  position: relative;
  box-shadow: 0 0 10px var(--color-accent-glow);
}

.progress-bar__fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.2) 50%,
    transparent 100%
  );
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* 模态框组件 */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  z-index: var(--z-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-accent);
  border-radius: var(--radius-md);
  max-width: 800px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-base);
  box-shadow: var(--shadow-lg), 0 0 40px rgba(0, 255, 65, 0.1);
}

.modal-backdrop.active .modal {
  transform: scale(1) translateY(0);
}

.modal__header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal__title {
  font-size: var(--text-xl);
  margin-bottom: 0;
}

.modal__close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: var(--text-xl);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.modal__close:hover {
  color: var(--color-danger);
  background: rgba(255, 51, 51, 0.1);
}

.modal__body {
  padding: var(--space-lg);
}

.modal__footer {
  padding: var(--space-lg);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-md);
}

/* 页脚组件 */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--space-3xl) 0 var(--space-lg);
  margin-top: var(--space-3xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer__section-title {
  font-size: var(--text-lg);
  color: var(--color-accent);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.footer__link {
  display: block;
  color: var(--color-text-secondary);
  padding: var(--space-xs) 0;
  transition: all var(--transition-fast);
  font-size: var(--text-sm);
}

.footer__link:hover {
  color: var(--color-accent);
  padding-left: var(--space-sm);
}

.footer__bottom {
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.footer__bottom a {
  color: var(--color-accent);
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 48px;
  height: 48px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: var(--text-xl);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: var(--z-sticky);
  box-shadow: var(--shadow-md);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent-dim);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

/* 加载状态组件 */
.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  gap: var(--space-lg);
}

.loading-screen__text {
  font-family: var(--font-display);
  color: var(--color-accent);
  font-size: var(--text-sm);
  letter-spacing: 0.2em;
  animation: blink 1s infinite;
}

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

/* ===== 6. Utilities - 工具类 ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-accent { color: var(--color-accent); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-danger); }
.text-info { color: var(--color-info); }
.text-muted { color: var(--color-text-muted); }

.font-display { font-family: var(--font-display); }
.font-body { font-family: var(--font-body); }
.font-data { font-family: var(--font-data); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-sm); }
.mt-2 { margin-top: var(--space-md); }
.mt-3 { margin-top: var(--space-lg); }
.mt-4 { margin-top: var(--space-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }
.mb-4 { margin-bottom: var(--space-xl); }

.p-1 { padding: var(--space-sm); }
.p-2 { padding: var(--space-md); }
.p-3 { padding: var(--space-lg); }
.p-4 { padding: var(--space-xl); }

.hidden { display: none !important; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Glitch效果文字 */
.glitch {
  position: relative;
  animation: glitch-skew 1s infinite linear alternate-reverse;
}

.glitch::before,
.glitch::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.glitch::before {
  left: 2px;
  text-shadow: -2px 0 #ff3333;
  clip: rect(44px, 450px, 56px, 0);
  animation: glitch-anim 5s infinite linear alternate-reverse;
}

.glitch::after {
  left: -2px;
  text-shadow: -2px 0 #00bfff;
  clip: rect(44px, 450px, 56px, 0);
  animation: glitch-anim2 5s infinite linear alternate-reverse;
}

@keyframes glitch-anim {
  0% { clip: rect(31px, 9999px, 94px, 0); }
  5% { clip: rect(70px, 9999px, 71px, 0); }
  10% { clip: rect(29px, 9999px, 24px, 0); }
  15% { clip: rect(95px, 9999px, 46px, 0); }
  20% { clip: rect(34px, 9999px, 3px, 0); }
  25% { clip: rect(22px, 9999px, 86px, 0); }
  30% { clip: rect(6px, 9999px, 68px, 0); }
  35% { clip: rect(58px, 9999px, 38px, 0); }
  40% { clip: rect(30px, 9999px, 89px, 0); }
  45% { clip: rect(45px, 9999px, 23px, 0); }
  50% { clip: rect(81px, 9999px, 17px, 0); }
  55% { clip: rect(63px, 9999px, 62px, 0); }
  60% { clip: rect(52px, 9999px, 91px, 0); }
  65% { clip: rect(28px, 9999px, 5px, 0); }
  70% { clip: rect(41px, 9999px, 75px, 0); }
  75% { clip: rect(73px, 9999px, 35px, 0); }
  80% { clip: rect(14px, 9999px, 80px, 0); }
  85% { clip: rect(8px, 9999px, 49px, 0); }
  90% { clip: rect(67px, 9999px, 11px, 0); }
  95% { clip: rect(55px, 9999px, 83px, 0); }
  100% { clip: rect(19px, 9999px, 96px, 0); }
}

@keyframes glitch-anim2 {
  0% { clip: rect(65px, 9999px, 119px, 0); }
  5% { clip: rect(92px, 9999px, 15px, 0); }
  10% { clip: rect(43px, 9999px, 101px, 0); }
  15% { clip: rect(76px, 9999px, 53px, 0); }
  20% { clip: rect(18px, 9999px, 87px, 0); }
  25% { clip: rect(31px, 9999px, 38px, 0); }
  30% { clip: rect(84px, 9999px, 9px, 0); }
  35% { clip: rect(57px, 9999px, 73px, 0); }
  40% { clip: rect(12px, 9999px, 45px, 0); }
  45% { clip: rect(99px, 9999px, 27px, 0); }
  50% { clip: rect(39px, 9999px, 95px, 0); }
  55% { clip: rect(71px, 9999px, 61px, 0); }
  60% { clip: rect(24px, 9999px, 82px, 0); }
  65% { clip: rect(48px, 9999px, 13px, 0); }
  70% { clip: rect(86px, 9999px, 69px, 0); }
  75% { clip: rect(7px, 9999px, 100px, 0); }
  80% { clip: rect(54px, 9999px, 33px, 0); }
  85% { clip: rect(91px, 9999px, 47px, 0); }
  90% { clip: rect(36px, 9999px, 78px, 0); }
  95% { clip: rect(62px, 9999px, 21px, 0); }
  100% { clip: rect(15px, 9999px, 90px, 0); }
}

@keyframes glitch-skew {
  0% { transform: skew(0deg); }
  20% { transform: skew(-0.5deg); }
  40% { transform: skew(0.5deg); }
  60% { transform: skew(-0.3deg); }
  80% { transform: skew(0.3deg); }
  100% { transform: skew(0deg); }
}

/* 呼吸发光效果 */
.glow-pulse {
  animation: glow-pulse 2s ease-in-out infinite;
}

@keyframes glow-pulse {
  0%, 100% {
    box-shadow: 0 0 5px var(--color-accent-dim);
  }
  50% {
    box-shadow: 0 0 20px var(--color-accent-glow), 0 0 40px var(--color-accent-dim);
  }
}

/* ===== 7. Responsive Design - 响应式断点 ===== */

/* Tablet (768px - 1199px) */
@media (max-width: 1199px) {
  :root {
    --text-5xl: 2.5rem;
    --text-4xl: 2rem;
    --text-3xl: 1.75rem;
  }

  .container {
    padding: 0 var(--space-md);
  }

  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }

  .navbar__menu {
    gap: var(--space-lg);
  }

  .navbar__link {
    font-size: var(--text-xs);
  }
}

/* Mobile (< 768px) */
@media (max-width: 768px) {
  :root {
    --text-5xl: 2rem;
    --text-4xl: 1.75rem;
    --text-3xl: 1.5rem;
    --text-2xl: 1.25rem;
  }

  /* 移动端导航栏 */
  .navbar__toggle {
    display: flex;
  }

  .navbar__menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 15, 13, 0.98);
    backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: var(--space-3xl);
    gap: var(--space-xl);
    transform: translateX(100%);
    transition: transform var(--transition-base);
  }

  .navbar__menu.open {
    transform: translateX(0);
  }

  .navbar__link {
    font-size: var(--text-lg);
    padding: var(--space-md);
  }

  /* 移动端网格布局 */
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

  .section {
    padding: var(--space-xl) 0;
  }

  /* 移动端卡片优化 */
  .card {
    padding: var(--space-md);
  }

  /* 移动端模态框 */
  .modal {
    width: 95%;
    max-height: 90vh;
  }

  /* 返回顶部按钮位置调整 */
  .back-to-top {
    bottom: var(--space-md);
    right: var(--space-md);
    width: 44px;
    height: 44px;
  }
}

/* 小屏手机 (< 480px) */
@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .container {
    padding: 0 var(--space-sm);
  }

  .btn--lg {
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--text-sm);
  }
}