/* ==========================================================================
   认证页（登录 / 注册）
   ========================================================================== */

.auth {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  background: var(--bg);
}

/* ---------------- 左侧品牌面板 ---------------- */
.auth__aside {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 44px 48px;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(120% 90% at 0% 0%, #312e81 0%, transparent 60%),
    radial-gradient(110% 80% at 100% 100%, #0e7490 0%, transparent 58%),
    linear-gradient(150deg, #1b1b4b 0%, #241f5e 46%, #102a4c 100%);
}
/* 细网格纹理：轻科技感，不抢内容 */
.auth__aside::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 38px 38px;
  mask-image: radial-gradient(80% 70% at 30% 20%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(80% 70% at 30% 20%, #000 20%, transparent 78%);
}
.auth__aside > * { position: relative; z-index: 1; }

.auth__brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 16px;
  font-weight: 650;
  letter-spacing: -0.01em;
}
.auth__brand .brand__mark {
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.24);
  box-shadow: none;
  backdrop-filter: blur(6px);
}

.auth__pitch { margin: auto 0; max-width: 420px; }
.auth__pitch h1 {
  font-size: clamp(26px, 2.6vw, 36px);
  line-height: 1.28;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: #fff;
}
.auth__pitch h1 span { color: #a5b4fc; }
.auth__pitch p {
  margin-top: 14px;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.68);
}

.auth__points { margin-top: 30px; display: flex; flex-direction: column; gap: 14px; }
.auth__point { display: flex; align-items: flex-start; gap: 12px; font-size: 13.5px; color: rgba(255, 255, 255, 0.82); }
.auth__point i {
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  font-size: 12px;
  color: #c7d2fe;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.16);
}
.auth__point b { display: block; color: #fff; font-weight: 600; margin-bottom: 1px; }
.auth__point span { color: rgba(255, 255, 255, 0.6); font-size: 12.5px; }

.auth__aside-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.45);
}

/* ---------------- 右侧表单区 ---------------- */
.auth__main {
  display: flex;
  flex-direction: column;
  padding: 28px clamp(20px, 5vw, 64px);
  overflow-y: auto;
}
.auth__topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.auth__topbar .brand { font-size: 15px; }
.auth__mobile-brand { display: none; }

.auth__card {
  width: 100%;
  max-width: 400px;
  margin: auto;
  padding: 6px 0;
}
.auth__head { margin-bottom: 22px; }
.auth__head h2 { font-size: 23px; letter-spacing: -0.02em; }
.auth__head p { margin-top: 6px; font-size: 13.5px; color: var(--text-2); }

.auth__switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 4px;
  border-radius: var(--r-md);
  background: var(--surface-3);
  margin-bottom: 22px;
}
.auth__switch button {
  padding: 9px 0;
  border: 0;
  border-radius: var(--r-xs);
  background: transparent;
  color: var(--text-2);
  font-size: 13.5px;
  font-weight: 550;
  cursor: pointer;
  transition: all 0.2s var(--ease);
}
.auth__switch button.is-active {
  background: var(--surface);
  color: var(--primary);
  box-shadow: var(--shadow-1);
}

.auth-form { display: flex; flex-direction: column; gap: 15px; }
.auth-form .field { gap: 6px; }

.auth__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 13px;
}
.auth__check { display: inline-flex; align-items: center; gap: 8px; color: var(--text-2); cursor: pointer; }
.auth__link { color: var(--primary); font-weight: 550; }
.auth__link:hover { text-decoration: underline; }

.strength { display: flex; align-items: center; gap: 9px; margin-top: 2px; }
.strength__track { flex: 1; height: 4px; border-radius: var(--r-pill); background: var(--surface-3); overflow: hidden; }
.strength__fill { height: 100%; width: 0; border-radius: inherit; transition: width 0.3s var(--ease), background 0.3s var(--ease); }
.strength__text { font-size: 11.5px; color: var(--text-3); min-width: 52px; text-align: right; }

.auth__submit { margin-top: 4px; }
.auth__foot { margin-top: 18px; text-align: center; font-size: 12.5px; color: var(--text-3); }
.auth__divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 20px 0 0;
  font-size: 12px;
  color: var(--text-3);
}
.auth__divider::before,
.auth__divider::after { content: ""; height: 1px; flex: 1; background: var(--line); }

/* ---------------- 响应式 ---------------- */
@media (max-width: 980px) {
  .auth { grid-template-columns: minmax(0, 1fr); }
  .auth__aside { display: none; }
  .auth__main { min-height: 100vh; padding-top: 22px; }
  .auth__mobile-brand { display: flex; align-items: center; justify-content: center; gap: 10px; margin-bottom: 26px; }
  .auth__card { margin-top: 0; margin-bottom: auto; }
}

/* ---------------- 左栏：流动光晕 ---------------- */
.auth__aside::after {
  content: "";
  position: absolute;
  width: 68%;
  height: 62%;
  left: -14%;
  top: -18%;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(52px);
  background: radial-gradient(circle, rgba(129, 140, 248, 0.5), transparent 66%);
  animation: drift-a 26s var(--ease) infinite alternate;
  z-index: 0;
}
.auth__aside::before { z-index: 0; }
.auth__aside > * { z-index: 1; }