/* ============================================
   CppLearner · 登录 / 注册模态框
   ============================================ */

/* 遮罩层 */
.auth-overlay {
  position: fixed;
  inset: 0;
  background: rgba(26, 41, 37, 0.55);
  backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.auth-overlay.show {
  opacity: 1;
  pointer-events: auto;
}

/* 模态框主体 */
.auth-modal {
  background: var(--paper);
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  width: 420px;
  max-width: calc(100vw - 32px);
  padding: 40px 40px 36px;
  position: relative;
  box-shadow: 0 20px 60px rgba(26,41,37,0.18), 0 4px 16px rgba(26,41,37,0.1);
  transform: translateY(-12px);
  transition: transform 0.25s ease;
}
.auth-overlay.show .auth-modal {
  transform: translateY(0);
}

/* 关闭按钮 */
.auth-close {
  position: absolute;
  top: 14px;
  right: 16px;
  background: none;
  border: none;
  font-size: 22px;
  color: var(--ink-mute);
  cursor: pointer;
  line-height: 1;
  padding: 4px 8px;
  border-radius: 3px;
  transition: color 0.15s, background 0.15s;
}
.auth-close:hover {
  color: var(--ink-deep);
  background: var(--paper-warm);
}

/* 品牌标识 */
.auth-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}
.auth-brand-mark {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 900;
  color: var(--jade);
  letter-spacing: -1px;
  line-height: 1;
}
.auth-brand-mark span {
  color: var(--vermilion);
  font-size: 18px;
}
.auth-brand-text {
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--ink-soft);
  font-weight: 500;
}

/* 标签切换 */
.auth-tabs {
  display: flex;
  border-bottom: 2px solid var(--paper-line);
  margin-bottom: 28px;
  gap: 0;
}
.auth-tab {
  background: none;
  border: none;
  padding: 8px 20px;
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--ink-mute);
  cursor: pointer;
  position: relative;
  transition: color 0.15s;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
}
.auth-tab.active {
  color: var(--jade);
  font-weight: 600;
  border-bottom-color: var(--jade);
}
.auth-tab:hover:not(.active) {
  color: var(--ink-soft);
}

/* 表单 */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.auth-form.hidden {
  display: none;
}

.auth-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.auth-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-soft);
  letter-spacing: 0.3px;
}
.auth-input {
  height: 42px;
  padding: 0 14px;
  border: 1.5px solid var(--paper-line);
  border-radius: 3px;
  background: var(--paper);
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--ink-deep);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.auth-input:focus {
  border-color: var(--jade);
  box-shadow: 0 0 0 3px rgba(45,90,74,0.1);
}
.auth-input::placeholder {
  color: var(--ink-mute);
  font-size: 13px;
}

/* 消息提示 */
.auth-msg {
  min-height: 20px;
  font-size: 13px;
  border-radius: 3px;
  padding: 0;
  transition: all 0.2s;
}
.auth-msg.error {
  color: var(--vermilion);
  background: var(--vermilion-bg);
  padding: 8px 12px;
}
.auth-msg.success {
  color: var(--jade);
  background: var(--jade-glow);
  padding: 8px 12px;
}

/* 提交按钮 */
.auth-submit {
  height: 44px;
  background: var(--jade);
  color: #fff;
  border: none;
  border-radius: 3px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 1px;
  transition: background 0.15s, transform 0.1s;
  margin-top: 4px;
}
.auth-submit:hover {
  background: var(--jade-soft);
}
.auth-submit:active {
  transform: scale(0.98);
}

/* 底部提示链接 */
.auth-hint {
  text-align: center;
  font-size: 13px;
  color: var(--ink-mute);
}
.auth-hint a {
  color: var(--jade);
  text-decoration: none;
  font-weight: 500;
}
.auth-hint a:hover {
  text-decoration: underline;
}

/* ——— Header 中的登录按钮 ——— */
.auth-btn {
  height: 34px;
  padding: 0 16px;
  background: transparent;
  border: 1.5px solid var(--paper-line);
  border-radius: 3px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--ink-soft);
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  margin-left: 12px;
}
.auth-btn:hover {
  border-color: var(--jade);
  color: var(--jade);
}
.auth-btn.logged-in {
  border-color: var(--jade);
  color: var(--jade);
  background: var(--jade-glow);
  font-weight: 600;
}
.auth-btn.logged-in:hover {
  background: var(--paper-warm);
  border-color: var(--vermilion);
  color: var(--vermilion);
}

@media (max-width: 600px) {
  .auth-modal {
    padding: 32px 24px 28px;
  }
}