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

body {
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  overflow: hidden;
}

.login-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* 背景层 - 工业风格渐变 + 几何图案 */
.login-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    linear-gradient(135deg, #1e3a8a 0%, #1e40af 25%, #3b82f6 50%, #60a5fa 75%, #93c5fd 100%);
  z-index: 0;
}

.login-background::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(255, 255, 255, 0.03) 2px,
      rgba(255, 255, 255, 0.03) 4px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 2px,
      rgba(255, 255, 255, 0.03) 2px,
      rgba(255, 255, 255, 0.03) 4px
    );
  background-size: 50px 50px;
}

.login-background::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 80%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-50px, 50px) scale(1.1);
  }
}

/* 登录卡片 */
.login-card {
  position: relative;
  z-index: 1;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-radius: 24px;
  box-shadow: 
    0 20px 60px rgba(0, 0, 0, 0.3),
    0 0 0 1px rgba(255, 255, 255, 0.1) inset;
  padding: 48px;
  width: 90%;
  max-width: 440px;
  animation: slideUp 0.6s ease-out;
}

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

/* 登录头部 */
.login-header {
  text-align: center;
  margin-bottom: 40px;
}

.logo-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 8px;
}

.logo-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: float-icon 3s ease-in-out infinite;
}

.logo-icon svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 4px 8px rgba(59, 130, 246, 0.3));
}

/* 比特币旋转硬币 */
.logo-icon.bitcoin-coin {
  perspective: 500px;
  animation: none;
}

.logo-icon.bitcoin-coin .coin-face {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  backface-visibility: hidden;
}

.logo-icon.bitcoin-coin .front {
  transform: translateZ(2px);
  animation: rotate-bitcoin 7s infinite linear;
  transform-style: preserve-3d;
}

.logo-icon.bitcoin-coin .back {
  transform: rotateY(180deg) translateZ(2px);
  animation: rotate-bitcoin 7s infinite linear;
  transform-style: preserve-3d;
}

.logo-icon.bitcoin-coin::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #b36a00, #faa504, #b36a00);
  border-radius: 50%;
  animation: rotate-bitcoin 7s infinite linear;
  transform-style: preserve-3d;
}

@keyframes rotate-bitcoin {
  0% { transform: rotateY(0deg); }
  100% { transform: rotateY(360deg); }
}

@keyframes float-icon {
  0%, 100% {
    transform: translateY(0) scale(1);
  }
  50% {
    transform: translateY(-5px) scale(1.02);
  }
}

.system-title {
  font-size: 28px;
  font-weight: 700;
  color: #1e3a8a;
  margin: 0;
}

.system-subtitle {
  font-size: 13px;
  color: #64748b;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin: 0;
}

/* 表单 */
.login-form {
  margin-bottom: 32px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: #334155;
  margin-bottom: 8px;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 16px;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 1;
  color: #64748b;
  transition: all 0.3s ease;
}

.input-icon svg {
  width: 100%;
  height: 100%;
}

.form-input {
  width: 100%;
  padding: 14px 16px 14px 48px;
  font-size: 15px;
  font-family: inherit;
  color: #1e293b;
  background: #f8fafc;
  border: 2px solid #e2e8f0;
  border-radius: 12px;
  transition: all 0.3s ease;
  outline: none;
}

.form-input::placeholder {
  color: #94a3b8;
}

.form-input:focus {
  background: #ffffff;
  border-color: #3b82f6;
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.input-wrapper:focus-within .input-icon {
  color: #3b82f6;
  transform: scale(1.1);
}

/* 验证码 */
.captcha-wrapper {
  display: flex;
  gap: 12px;
  align-items: center;
}

.captcha-image-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 120px;
  height: 48px;
  background: #f8fafc;
  border: 2px solid #e2e8f0;
  border-radius: 12px;
  overflow: hidden;
  flex-shrink: 0;
  cursor: pointer;
  transition: all 0.3s ease;
}

.captcha-image-wrapper:hover {
  border-color: #3b82f6;
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
  transform: scale(1.02);
}

.captcha-image-wrapper:active {
  transform: scale(0.98);
}

.captcha-image-wrapper.refreshing {
  animation: rotate 0.3s ease;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(180deg);
  }
}

.captcha-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  pointer-events: none;
}

/* 错误消息 */
.error-message {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #dc2626;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 14px;
  margin-bottom: 20px;
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-10px); }
  75% { transform: translateX(10px); }
}

/* 登录按钮 */
.login-btn {
  width: 100%;
  padding: 16px;
  font-size: 16px;
  font-weight: 600;
  font-family: inherit;
  color: #ffffff;
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
  position: relative;
  overflow: hidden;
}

.login-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease;
}

.login-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

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

.login-btn:active {
  transform: translateY(0);
}

.login-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.btn-loader {
  display: flex;
  gap: 6px;
  justify-content: center;
  align-items: center;
}

.btn-loader .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ffffff;
  animation: bounce 0.9s ease infinite;
}

.btn-loader .dot:nth-child(2) {
  animation-delay: 0.15s;
}

.btn-loader .dot:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
    opacity: 0.7;
  }
  50% {
    transform: translateY(-8px);
    opacity: 1;
  }
}

/* 页脚 */
.login-footer {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid #e2e8f0;
}

.login-footer p {
  font-size: 13px;
  color: #64748b;
  margin: 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .login-card {
    padding: 32px 24px;
    max-width: 100%;
    margin: 20px;
  }
  
  .system-title {
    font-size: 24px;
  }
  
  .logo-icon {
    font-size: 40px;
  }
}

@media (max-width: 480px) {
  .login-card {
    padding: 24px 20px;
  }
  
  .system-title {
    font-size: 20px;
  }
  
  .logo-container {
    flex-direction: column;
    gap: 8px;
  }
}