/* 心岛 v1.0.8 · 登录 / 注册。表单沿用 v0.x 的 ink-tab 语气，色彩回到 v1.0 蜜糖律。 */
.s-auth { background: var(--ink-deeper); }

.s-auth .stage {
  z-index: 4;
  display: grid;
  place-items: center;
  padding: var(--gutter);
}

.s-auth-card {
  width: min(520px, 92vw);
  max-height: min(760px, 90vh);
  overflow: auto;
  padding: clamp(28px, 5vw, 52px) clamp(24px, 5vw, 56px) clamp(24px, 4vw, 38px);
  border: 1px solid var(--light-rim);
  border-radius: 6px;
  background: rgba(247, 241, 227, .95);
  color: var(--ink-deep);
  box-shadow: 0 24px 70px rgba(26, 32, 40, .48), 0 0 36px var(--light-faint);
  text-align: center;
}

.s-auth-eyebrow {
  color: var(--living);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .16em;
}

.s-auth-greeting {
  margin-top: var(--sp-2);
  color: var(--ink-deep);
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 400;
  letter-spacing: .08em;
}

.s-auth-hint {
  margin-top: var(--sp-1);
  color: var(--ink);
  font-size: 16px;
  letter-spacing: .06em;
}

.ink-tabs {
  display: flex;
  margin: var(--sp-4) 0 var(--sp-3);
  border-bottom: 1px dashed var(--air-dim);
}

.ink-tab {
  position: relative;
  flex: 1;
  min-height: 42px;
  padding: 8px 10px 11px;
  border: 0;
  background: transparent;
  color: var(--air);
  font: 15px var(--font-body);
  letter-spacing: .06em;
  cursor: pointer;
  transition: color var(--t-quick) var(--e-out);
}

.ink-tab:hover,
.ink-tab:focus-visible { color: var(--light-rim); }
.ink-tab.active { color: var(--ink-deep); }
.ink-tab.active::after {
  content: "";
  position: absolute;
  left: 12%;
  right: 12%;
  bottom: -1px;
  height: 3px;
  border-radius: 2px 2px 0 0;
  background: var(--light);
  box-shadow: 0 0 12px var(--light-halo);
}
.tab-glyph { margin-right: 6px; color: var(--light-rim); font-family: var(--font-mono); font-size: 18px; }

.ink-form { display: grid; gap: var(--sp-2); text-align: left; }
.ink-field { display: grid; gap: 5px; }
.ink-label {
  padding-left: 2px;
  color: var(--ink);
  font-size: 14px;
  letter-spacing: .04em;
}
.ink-pen { margin-right: 6px; color: var(--light-rim); }
.ink-input {
  width: 100%;
  padding: 12px 8px 10px;
  border: 0;
  border-bottom: 2px solid var(--air-dim);
  border-radius: 0;
  outline: none;
  background: rgba(247, 241, 227, .52);
  color: var(--ink-deep);
  font: 17px var(--font-body);
  transition: border-color var(--t-quick) var(--e-out), box-shadow var(--t-quick) var(--e-out), background var(--t-quick) var(--e-out);
}
.ink-input::placeholder { color: var(--air); }
.ink-input:focus {
  border-bottom-color: var(--light);
  background: var(--paper);
  box-shadow: 0 4px 0 -2px var(--light), 0 0 14px var(--light-faint);
}

.ink-error {
  min-height: 0;
  margin: 0;
  padding: 0;
  color: var(--light-rim);
  font-size: 14px;
  line-height: 1.55;
  opacity: 0;
  transition: opacity var(--t-quick) var(--e-out);
}
.ink-error.visible { opacity: 1; }

.s-auth-submit {
  width: 100%;
  min-height: 48px;
  margin-top: var(--sp-1);
  padding: 12px 20px;
  border: 1px solid var(--light);
  border-radius: 4px;
  background: var(--light);
  color: var(--ink-deep);
  font: 16px var(--font-body);
  letter-spacing: .12em;
  cursor: pointer;
  transition: filter var(--t-quick) var(--e-out), transform var(--t-quick) var(--e-out), opacity var(--t-quick) var(--e-out);
}
.s-auth-submit:hover,
.s-auth-submit:focus-visible { filter: brightness(1.08); transform: translateY(-1px); }
.s-auth-submit:disabled { cursor: wait; opacity: .62; }

.s-auth-note {
  margin-top: var(--sp-3);
  color: var(--air);
  font-size: 12px;
  line-height: 1.65;
}

.s-auth-shake { animation: auth-shake 500ms var(--e-out); }
@keyframes auth-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-7px); }
  40% { transform: translateX(7px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(5px); }
}

@media (max-width: 520px) {
  .s-auth-card { width: min(94vw, 520px); padding: 28px 22px 24px; }
  .ink-tab { font-size: 14px; }
}