/* ============================================================
   YISHIJIE — 登录 / 注册页面样式
   玻璃拟态卡片布局，复用 main.css 设计 token
   ============================================================ */

/* --- 页面主体 --- */
.auth-page {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 100px var(--sp-6) var(--sp-12);
  position: relative;
  overflow: hidden;
}

/* 背景装饰光晕 */
.auth-page::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  opacity: 0.5;
  pointer-events: none;
  z-index: 0;
}

.auth-page::after {
  content: '';
  position: absolute;
  bottom: 10%;
  right: 10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, oklch(68% 0.2 145 / 0.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* --- 卡片容器 --- */
.auth-card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 440px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--sp-12) var(--sp-10);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: var(--shadow-lg);
  animation: auth-card-in 0.5s var(--ease-out-expo);
}

@keyframes auth-card-in {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 注册卡片稍宽 */
.auth-card.auth-card-wide {
  max-width: 520px;
}

/* --- 头部 --- */
.auth-header {
  text-align: center;
  margin-bottom: var(--sp-8);
}

.auth-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  margin-bottom: var(--sp-6);
}

.auth-logo .logo-img {
  height: 36px;
}

.auth-title {
  font-family: var(--font-heading);
  font-size: var(--fs-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-2);
}

.auth-subtitle {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- 表单 --- */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.form-label {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.form-label .label-optional {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  font-weight: 400;
}

.form-input {
  width: 100%;
  padding: 0.75rem var(--sp-4);
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--fs-base);
  font-family: var(--font-body);
  transition: all var(--duration-fast) var(--ease-out-expo);
  outline: none;
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

.form-input:hover {
  border-color: var(--color-text-muted);
}

.form-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

.form-input.error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px oklch(60% 0.22 25 / 0.1);
}

/* 输入框带图标 */
.input-wrapper {
  position: relative;
}

.input-wrapper .input-icon {
  position: absolute;
  left: var(--sp-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
  transition: color var(--duration-fast);
}

.input-wrapper .form-input {
  padding-left: 2.75rem;
}

.input-wrapper:focus-within .input-icon {
  color: var(--color-accent);
}

/* --- 错误提示 --- */
.form-error {
  font-size: var(--fs-xs);
  color: var(--color-error);
  min-height: 1em;
  line-height: 1.4;
}

.form-error:empty {
  display: none;
}

/* 全局错误提示条 */
.auth-alert {
  display: none;
  align-items: center;
  gap: var(--sp-2);
  padding: 0.75rem var(--sp-4);
  border-radius: var(--radius-md);
  background: oklch(60% 0.22 25 / 0.12);
  border: 1px solid oklch(60% 0.22 25 / 0.25);
  color: var(--color-error);
  font-size: var(--fs-sm);
  margin-bottom: var(--sp-4);
}

.auth-alert.show {
  display: flex;
  animation: alert-shake 0.4s var(--ease-out-expo);
}

@keyframes alert-shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

.auth-alert svg {
  flex-shrink: 0;
}

/* --- 密码可见切换 --- */
.password-toggle {
  position: absolute;
  right: var(--sp-3);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--sp-1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--duration-fast);
}

.password-toggle:hover {
  color: var(--color-text-primary);
}

.input-wrapper.has-toggle .form-input {
  padding-right: 2.75rem;
}

/* --- 提交按钮 --- */
.auth-submit {
  width: 100%;
  padding: 0.875rem var(--sp-6);
  background: var(--color-accent);
  color: oklch(12% 0.01 80);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: var(--fs-base);
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out-expo);
  box-shadow: 0 2px 12px var(--color-accent-glow);
  margin-top: var(--sp-2);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
}

.auth-submit:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--color-accent-glow);
}

.auth-submit:active {
  transform: scale(0.98);
}

.auth-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.auth-submit .spinner {
  width: 18px;
  height: 18px;
  border: 2px solid oklch(12% 0.01 80 / 0.3);
  border-top-color: oklch(12% 0.01 80);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* --- 底部链接 --- */
.auth-footer {
  text-align: center;
  margin-top: var(--sp-6);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--color-border);
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
}

.auth-footer a {
  color: var(--color-accent);
  font-weight: 500;
  transition: opacity var(--duration-fast);
}

.auth-footer a:hover {
  opacity: 0.8;
}

/* --- 分隔线 --- */
.auth-divider {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin: var(--sp-6) 0;
  color: var(--color-text-muted);
  font-size: var(--fs-xs);
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* --- 返回首页链接 --- */
.auth-back {
  position: absolute;
  top: var(--sp-6);
  left: var(--sp-6);
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  padding: 0.5rem var(--sp-3);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  transition: all var(--duration-fast);
}

.auth-back:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-hover);
}

/* --- 验证码输入组（手机号 + 发送按钮） --- */
.input-group {
  display: flex;
  gap: var(--sp-2);
}

.input-group .input-wrapper {
  flex: 1;
}

.send-code-btn {
  flex-shrink: 0;
  padding: 0 1.25rem;
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-accent);
  font-size: var(--fs-sm);
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out-expo);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.send-code-btn:hover:not(:disabled) {
  border-color: var(--color-accent);
  background: var(--color-accent-subtle);
}

.send-code-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  color: var(--color-text-muted);
}

.send-code-btn .spinner {
  width: 14px;
  height: 14px;
  border: 2px solid var(--color-accent-glow);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* --- 其他登录方式折叠 --- */
.alt-login {
  margin-top: var(--sp-4);
}

.alt-login-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  width: 100%;
  padding: 0.625rem;
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  cursor: pointer;
  transition: color var(--duration-fast);
}

.alt-login-toggle:hover {
  color: var(--color-text-secondary);
}

.alt-login-toggle svg {
  transition: transform var(--duration-fast) var(--ease-out-expo);
}

.alt-login-toggle.expanded svg {
  transform: rotate(180deg);
}

.alt-login-panel {
  display: none;
  animation: alt-login-slide 0.3s var(--ease-out-expo);
}

.alt-login-panel.show {
  display: block;
}

@keyframes alt-login-slide {
  from {
    opacity: 0;
    max-height: 0;
  }
  to {
    opacity: 1;
    max-height: 500px;
  }
}

/* --- 开发模式验证码提示 --- */
.dev-code-hint {
  display: none;
  padding: 0.625rem var(--sp-3);
  border-radius: var(--radius-md);
  background: oklch(68% 0.2 145 / 0.1);
  border: 1px solid oklch(68% 0.2 145 / 0.25);
  color: oklch(55% 0.18 145);
  font-size: var(--fs-sm);
  text-align: center;
  margin-top: var(--sp-2);
  animation: alert-shake 0.4s var(--ease-out-expo);
}

.dev-code-hint.show {
  display: block;
}

.dev-code-hint code {
  font-family: var(--font-mono, 'SF Mono', monospace);
  font-size: var(--fs-lg);
  font-weight: 700;
  letter-spacing: 0.15em;
}

[data-theme="light"] .dev-code-hint {
  color: oklch(45% 0.18 145);
}

/* --- 响应式 --- */
@media (max-width: 480px) {
  .auth-page {
    padding: 90px var(--sp-4) var(--sp-8);
  }

  .auth-card {
    padding: var(--sp-8) var(--sp-6);
    border-radius: var(--radius-xl);
  }

  .auth-card.auth-card-wide {
    max-width: 100%;
  }

  .auth-back {
    top: var(--sp-4);
    left: var(--sp-4);
  }
}