/* ============================================ * 公共样式 - index.html 与 board.html 共用 * 统一 CSS 变量、Toast、认证、动画等 * ============================================ */

/* ===== CSS 变量 ===== */
:root {
  --bg: #f5f7f6;
  --bg-card: #ffffff;
  --bg-input: #f9fafb;
  --border: #e2e7e4;
  --border-hover: #c8d1cc;
  --border-focus: #16a34a;
  --accent: #16a34a;
  --accent-hover: #15803d;
  --accent-dim: rgba(22, 163, 74, 0.06);
  --accent-glow: rgba(22, 163, 74, 0.1);
  --fg: #0f1612;
  --fg-secondary: #3a4a40;
  --fg-muted: #637068;
  --fg-dim: #9ba8a0;
  --danger: #dc2626;
  --danger-dim: rgba(220, 38, 38, 0.06);
  --warn: #d97706;
}

/* ===== 全局重置 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ===== 背景装饰 ===== */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,0,0,0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.028) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
}

.bg-glow-1 {
  position: fixed;
  width: 800px;
  height: 800px;
  top: -350px;
  left: -250px;
  background: radial-gradient(circle, rgba(22,163,74,0.06) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
  animation: drift1 16s ease-in-out infinite;
}

.bg-glow-2 {
  position: fixed;
  width: 600px;
  height: 600px;
  bottom: -200px;
  right: -150px;
  background: radial-gradient(circle, rgba(5,150,105,0.05) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
  animation: drift2 20s ease-in-out infinite;
}

@keyframes drift1 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(40px, 30px); }
}
@keyframes drift2 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-35px, -20px); }
}

/* ===== 浮动微粒 ===== */
.particles {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.particle {
  position: absolute;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0;
  animation: pFloat linear infinite;
}
@keyframes pFloat {
  0% { opacity: 0; transform: translateY(0) scale(0.5); }
  15% { opacity: 0.2; }
  85% { opacity: 0.2; }
  100% { opacity: 0; transform: translateY(-120px) scale(1); }
}

/* ===== 通用卡片 ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.02), 0 2px 4px rgba(0,0,0,0.02), 0 12px 40px rgba(0,0,0,0.04);
  position: relative;
  overflow: hidden;
}
.card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 24px;
  right: 24px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-glow), transparent);
}

/* ===== 通用输入框 ===== */
.input {
  width: 100%;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 13px 15px;
  color: var(--fg);
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 14.5px;
  transition: all 0.2s ease;
  outline: none;
  line-height: 1.5;
}
.input::placeholder {
  color: var(--fg-dim);
}
.input:hover {
  border-color: var(--border-hover);
  background: #fff;
}
.input:focus {
  border-color: var(--border-focus);
  background: #fff;
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.input.has-error {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px var(--danger-dim);
  animation: inputShake 0.35s ease;
}
@keyframes inputShake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  50% { transform: translateX(5px); }
  75% { transform: translateX(-3px); }
}

/* ===== 通用按钮 ===== */
.btn-primary {
  width: 100%;
  padding: 14px 28px;
  background: var(--accent);
  color: #fff;
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all 0.25s ease;
  letter-spacing: 0.01em;
}
.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 40%, rgba(255,255,255,0.15) 45%, rgba(255,255,255,0.15) 55%, transparent 60%);
  transform: translateX(-120%);
  transition: transform 0.5s ease;
}
.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 16px var(--accent-glow), 0 1px 3px rgba(0,0,0,0.06);
  transform: translateY(-1px);
}
.btn-primary:hover::after {
  transform: translateX(120%);
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: none;
}
.btn-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}
.btn-primary:disabled::after {
  display: none;
}
.btn-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.btn-inner svg {
  width: 16px;
  height: 16px;
}

/* ===== Spinner ===== */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===== Toast 统一 ===== */
.toast-wrap {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
.toast {
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 13.5px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transform: translateY(-16px);
  opacity: 0;
  animation: tIn 0.35s cubic-bezier(0.22,1,0.36,1) forwards;
  white-space: nowrap;
}
.toast.out {
  animation: tOut 0.25s ease forwards;
}
.toast.ok {
  background: rgba(22,163,74,0.1);
  border: 1px solid rgba(22,163,74,0.18);
  color: #15803d;
}
.toast.err {
  background: rgba(220,38,38,0.08);
  border: 1px solid rgba(220,38,38,0.14);
  color: #b91c1c;
}
.toast svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}
@keyframes tIn {
  to { transform: translateY(0); opacity: 1; }
}
@keyframes tOut {
  to { transform: translateY(-12px); opacity: 0; }
}

/* ===== 认证弹窗统一 ===== */
.auth-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.35);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  width: min(380px, 90vw);
  padding: 32px 28px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
  position: relative;
  overflow: hidden;
}
.auth-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 24px;
  right: 24px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-glow), transparent);
}
.auth-header {
  text-align: center;
  margin-bottom: 28px;
}
.auth-icon {
  width: 56px;
  height: 56px;
  background: var(--accent);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  box-shadow: 0 4px 12px var(--accent-glow);
}
.auth-icon svg {
  width: 26px;
  height: 26px;
  stroke: #fff;
  stroke-width: 2.5;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.auth-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 6px;
}
.auth-desc {
  font-size: 13px;
  color: var(--fg-muted);
}
.auth-input {
  width: 100%;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 13px 15px;
  color: var(--fg);
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 15px;
  text-align: center;
  letter-spacing: 0.05em;
  outline: none;
  transition: all 0.2s ease;
}
.auth-input::placeholder {
  color: var(--fg-dim);
}
.auth-input:hover {
  border-color: var(--border-hover);
  background: #fff;
}
.auth-input:focus {
  border-color: var(--border-focus);
  background: #fff;
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.auth-input.has-error {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px var(--danger-dim);
  animation: inputShake 0.35s ease;
}
.auth-remember {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  cursor: pointer;
}
.auth-remember input[type="checkbox"] {
  width: 14px;
  height: 14px;
  accent-color: var(--accent);
}
.auth-remember span {
  font-size: 12px;
  color: var(--fg-muted);
}
.auth-err {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin-top: 12px;
  font-size: 12px;
  color: var(--danger);
  opacity: 0;
  transform: translateY(-4px);
  transition: all 0.2s ease;
}
.auth-err.show {
  opacity: 1;
  transform: translateY(0);
}
.auth-err svg {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}
.auth-btn {
  width: 100%;
  padding: 14px 28px;
  background: var(--accent);
  color: #fff;
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all 0.25s ease;
  letter-spacing: 0.01em;
  margin-top: 20px;
}
.auth-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 40%, rgba(255,255,255,0.15) 45%, rgba(255,255,255,0.15) 55%, transparent 60%);
  transform: translateX(-120%);
  transition: transform 0.5s ease;
}
.auth-btn:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 16px var(--accent-glow), 0 1px 3px rgba(0,0,0,0.06);
  transform: translateY(-1px);
}
.auth-btn:hover::after {
  transform: translateX(120%);
}
.auth-btn:active {
  transform: translateY(0);
  box-shadow: none;
}
.auth-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}
.auth-btn:disabled::after {
  display: none;
}

/* ===== 错误提示 ===== */
.error-msg {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 6px;
  font-size: 12px;
  color: var(--danger);
  opacity: 0;
  transform: translateY(-4px);
  transition: all 0.2s ease;
}
.error-msg.visible {
  opacity: 1;
  transform: translateY(0);
}
.error-msg svg {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}

/* ===== 进场动画 ===== */
.enter {
  opacity: 0;
  transform: translateY(20px);
  animation: enterUp 0.6s ease forwards;
}
.enter-d1 { animation-delay: 0.05s; }
.enter-d2 { animation-delay: 0.12s; }
.enter-d3 { animation-delay: 0.19s; }
.enter-d4 { animation-delay: 0.26s; }
.enter-d5 { animation-delay: 0.33s; }
@keyframes enterUp {
  to { opacity: 1; transform: translateY(0); }
}

/* ===== 减弱动画偏好 ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}