/* ==========================================================================
   登录 / 注册页面 — modern 居中卡片
   - 复用 ct.css 的 .ct-bg-grid + .ct-bg-glow 背景层
   - 玻璃化中央卡片 (跟 .ct-assistant-panel / .hk-lang-switch__dropdown 同款)
   - 复用 .ct-input-field floating label, .ct-btn--primary 提交按钮
   ========================================================================== */

/* ==================== Page layout ==================== */
.ct-auth-page {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--ct-space-6) var(--ct-space-4);
  background: var(--ct-bg);
  overflow: hidden;
}
/* 背景两个金色 glow — 左上 + 右下, 制造 ambient lighting */
.ct-auth-page__glow--1 {
  top: -180px;
  left: -180px;
  width: 540px;
  height: 540px;
  opacity: 0.55;
}
.ct-auth-page__glow--2 {
  bottom: -200px;
  right: -160px;
  width: 600px;
  height: 600px;
  opacity: 0.4;
}
/* 粒子 + 连线 canvas (复用 motion.js 的 initHeroCanvas, 网格上层缓慢移动的星空) */
.ct-auth-page__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ==================== Card (玻璃化, 中心) ==================== */
.ct-auth-card {
  position: relative;
  width: 100%;
  max-width: 420px;
  padding: var(--ct-space-7) var(--ct-space-6);
  background: rgba(11, 16, 32, 0.42);
  backdrop-filter: blur(32px) saturate(170%);
  -webkit-backdrop-filter: blur(32px) saturate(170%);
  border: 1px solid var(--ct-border);
  border-radius: var(--ct-radius-2xl);
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  /* 注意: 父级不能加 transform/opacity 过渡 — 会破坏 backdrop-filter */
  display: flex;
  flex-direction: column;
  gap: var(--ct-space-5);
  z-index: 1;
}
.ct-auth-card--wide { max-width: 480px; }


/* 卡片金渐变细描边 (复用 .ct-card::before 同款 mask-composite 技巧) */
.ct-auth-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, var(--ct-gold-glow), transparent 40%, transparent 60%, var(--ct-gold-glow));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
          mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  pointer-events: none;
}

/* 子元素错位淡入 (跟 .ct-assistant-panel 同款) */
.ct-auth-card > * {
  animation: ct-auth-in 0.4s var(--ct-ease-out) backwards;
}
.ct-auth-card > *:nth-child(1) { animation-delay: 0.00s; }
.ct-auth-card > *:nth-child(2) { animation-delay: 0.06s; }
.ct-auth-card > *:nth-child(3) { animation-delay: 0.12s; }
.ct-auth-card > *:nth-child(4) { animation-delay: 0.18s; }
.ct-auth-card > *:nth-child(5) { animation-delay: 0.24s; }
.ct-auth-card > *:nth-child(6) { animation-delay: 0.30s; }
.ct-auth-card > *:nth-child(7) { animation-delay: 0.36s; }
@keyframes ct-auth-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ==================== Title (主标题: 登錄 / 註冊) ==================== */
.ct-auth-card__title {
  /* margin-bottom 跟 flex gap (24) 叠加 — 让标题跟下方主体拉开 ~56px */
  margin: 0 0 var(--ct-space-6);
  font-family: var(--ct-font-display);
  /* 跟 .ct-display--h1 (news/about/service hero 用的) 对齐 */
  font-size: var(--ct-fs-h1);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ct-gold);
  text-align: center;
  line-height: 1.04;
}
/* 中文走合成 italic; 英文保持直立 (跟项目其他 .ct-display 一致) */
html[lang="zh-HK"] .ct-auth-card__title,
html[lang="zh-CN"] .ct-auth-card__title {
  font-style: italic;
  font-variation-settings: 'opsz' 144, 'SOFT' 100;
}

/* ==================== Social buttons (Google / Apple) ==================== */
.ct-auth-socials {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.ct-auth-social {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 16px;
  border: 1px solid var(--ct-border-strong);
  border-radius: var(--ct-radius-pill);
  background: rgba(255, 255, 255, 0.025);
  color: var(--ct-text);
  font-family: var(--ct-font-ui);
  font-size: var(--ct-fs-sm);
  font-weight: 500;
  cursor: pointer;
  transition:
    background var(--ct-dur-fast) var(--ct-ease-out),
    border-color var(--ct-dur-fast) var(--ct-ease-out),
    transform var(--ct-dur-fast) var(--ct-ease-out);
}
.ct-auth-social:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--ct-border-gold);
  transform: translateY(-1px);
}
.ct-auth-social svg { display: block; flex: 0 0 18px; }

/* ==================== Divider "或" ==================== */
.ct-auth-divider {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: var(--ct-fs-xs);
  color: var(--ct-text-mute);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.ct-auth-divider::before,
.ct-auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--ct-border-strong), transparent);
}
.ct-auth-divider span { padding: 0 14px; }

/* ==================== Form ==================== */
.ct-auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--ct-space-3);
}
.ct-auth-form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.ct-auth-form__forgot {
  align-self: flex-end;
  font-size: var(--ct-fs-sm);
  color: var(--ct-text-soft);
  text-decoration: none;
  transition: color var(--ct-dur-fast) var(--ct-ease-out);
}
.ct-auth-form__forgot:hover { color: var(--ct-gold); }
.ct-auth-form__submit {
  width: 100%;
  margin-top: var(--ct-space-2);
  /* 跟 .ct-btn--primary --lg 复用, 这里只补一个 width:100% */
}

/* ==================== Floating-label input — pill 圆角 + glass ==================== */
.ct-input-field { position: relative; }
.ct-input-field input,
.ct-input-field textarea {
  width: 100%;
  height: 52px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--ct-border);
  border-radius: var(--ct-radius-pill);
  padding: 22px 22px 8px;
  color: var(--ct-text);
  font-family: var(--ct-font-ui);
  font-size: var(--ct-fs-sm);
  outline: none;
  transition:
    border-color var(--ct-dur) var(--ct-ease-out),
    background var(--ct-dur) var(--ct-ease-out),
    box-shadow var(--ct-dur) var(--ct-ease-out);
}
.ct-input-field input:focus,
.ct-input-field textarea:focus {
  border-color: var(--ct-border-gold);
  background: rgba(255, 255, 255, 0.05);
  box-shadow: 0 0 0 3px var(--ct-gold-soft);
}
.ct-input-field label {
  position: absolute;
  top: 50%;
  left: 22px;
  transform: translateY(-50%);
  font-size: var(--ct-fs-sm);
  color: var(--ct-text-mute);
  pointer-events: none;
  transition: all 200ms var(--ct-ease-out);
  background: transparent;
}
.ct-input-field input:focus ~ label,
.ct-input-field input:not(:placeholder-shown) ~ label,
.ct-input-field textarea:focus ~ label,
.ct-input-field textarea:not(:placeholder-shown) ~ label {
  top: 10px;
  transform: none;
  font-size: 10px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--ct-gold);
}

/* ==================== Foot link (signup / login 切换) ==================== */
.ct-auth-card__foot {
  margin: 0;
  text-align: center;
  font-size: var(--ct-fs-sm);
  color: var(--ct-text-soft);
}
.ct-auth-card__foot a {
  color: var(--ct-gold);
  text-decoration: none;
  font-weight: 500;
  margin-left: 4px;
  transition: color var(--ct-dur-fast) var(--ct-ease-out);
}
.ct-auth-card__foot a:hover { color: var(--ct-gold-light); }

/* ==================== Message banner (error / success / info) ==================== */
/* 玻璃化基底 — 与 .hk-lang-switch__dropdown 同款视觉语言 */
.ct-auth__message {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--ct-radius-lg);
  font-size: var(--ct-fs-sm);
  line-height: 1.55;
  border: 1px solid var(--ct-border);
  background: rgba(11, 16, 32, 0.42);
  backdrop-filter: blur(24px) saturate(160%);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  box-shadow:
    0 12px 32px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  animation: ct-auth-message-in 0.28s var(--ct-ease-out);
}
@keyframes ct-auth-message-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}
.ct-auth__message-icon {
  font-size: 16px;
  flex-shrink: 0;
}
.ct-auth__message-text {
  flex: 1;
  min-width: 0;
}
.ct-auth__message-link {
  color: inherit;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
  margin-left: 2px;
  transition: opacity 0.15s ease;
}
.ct-auth__message-link:hover {
  opacity: 0.8;
}

.ct-auth__message--error {
  border-color: rgba(248, 113, 113, 0.42);
  color: #ffb6b6;
}
.ct-auth__message--error .ct-auth__message-icon {
  color: var(--ct-danger);
}
.ct-auth__message--success {
  border-color: rgba(74, 222, 128, 0.42);
  color: #b9f8c5;
}
.ct-auth__message--success .ct-auth__message-icon {
  color: var(--ct-success);
}
.ct-auth__message--info {
  border-color: var(--ct-border-gold);
  color: var(--ct-gold-light, #e9d27a);
}
.ct-auth__message--info .ct-auth__message-icon {
  color: var(--ct-gold);
}

/* ==================== Signup-only · Dropzone (圆形头像) ==================== */
.ct-dropzone {
  display: flex;
  align-items: center;
  gap: var(--ct-space-4);
  padding: var(--ct-space-3);
  border: 1px dashed var(--ct-border-strong);
  border-radius: var(--ct-radius-lg);
  background: rgba(255, 255, 255, 0.02);
  cursor: pointer;
  transition:
    border-color var(--ct-dur-fast) var(--ct-ease-out),
    background var(--ct-dur-fast) var(--ct-ease-out);
}
.ct-dropzone:hover,
.ct-dropzone.is-drag {
  border-color: var(--ct-border-gold);
  background: var(--ct-gold-soft);
}
.ct-dropzone__preview {
  flex: 0 0 56px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.04) center / cover no-repeat;
  border: 1px dashed var(--ct-border-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ct-text-mute);
  font-size: 18px;
  transition: border-color var(--ct-dur-fast) var(--ct-ease-out);
}
.ct-dropzone:hover .ct-dropzone__preview {
  border-color: var(--ct-border-gold);
  color: var(--ct-gold);
}
.ct-dropzone__hint {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.ct-dropzone__hint-title {
  font-size: var(--ct-fs-sm);
  color: var(--ct-text);
  font-weight: 500;
}
.ct-dropzone__hint-sub {
  font-size: var(--ct-fs-xs);
  color: var(--ct-text-mute);
}

/* ==================== Signup-only · Toggle (同意条款) ==================== */
.ct-toggle {
  display: flex;
  align-items: center;
  gap: var(--ct-space-3);
  cursor: pointer;
  font-size: var(--ct-fs-sm);
  color: var(--ct-text-soft);
  user-select: none;
}
.ct-toggle input { display: none; }
.ct-toggle__sw {
  position: relative;
  flex: 0 0 36px;
  width: 36px;
  height: 20px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.10);
  transition: background var(--ct-dur-fast) var(--ct-ease-out);
}
.ct-toggle__sw::after {
  content: '';
  position: absolute;
  width: 14px;
  height: 14px;
  left: 3px;
  top: 3px;
  border-radius: 50%;
  background: var(--ct-text);
  transition: transform var(--ct-dur-fast) var(--ct-ease-out), background var(--ct-dur-fast) var(--ct-ease-out);
}
.ct-toggle input:checked ~ .ct-toggle__sw {
  background: var(--ct-gold);
}
.ct-toggle input:checked ~ .ct-toggle__sw::after {
  transform: translateX(16px);
  background: var(--ct-text-on-gold);
}
.ct-toggle__label a {
  color: var(--ct-gold);
  text-decoration: none;
  margin: 0 2px;
}
.ct-toggle__label a:hover { color: var(--ct-gold-light); }

/* ==================== Responsive ==================== */
@media (max-width: 520px) {
  .ct-auth-card {
    padding: var(--ct-space-6) var(--ct-space-5);
    border-radius: var(--ct-radius-xl);
  }
  .ct-auth-card__title { font-size: 24px; }
  .ct-auth-form__row { grid-template-columns: 1fr; }
}