/* =========================================================
   I-Chat — Auth Pages (Login / Register)
   Figma Design System: Monochrome + Pastel Color Blocks
   ========================================================= */

.auth-page {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  position: relative;
  overflow: hidden;
}

/* ---- Left: Brand Panel (Color Block) ---- */
.auth-brand {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--spacing-xxl) var(--spacing-xxl) var(--spacing-xxl) var(--spacing-xxl);
  background: var(--block-lilac);
  overflow: hidden;
}

.auth-brand .signal-field {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.3;
  pointer-events: none;
}

.signal-field span {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--ink);
  opacity: 0;
  animation: ripple 6s var(--ease) infinite;
}

.signal-field span:nth-child(1) {
  width: 120px;
  height: 120px;
  top: 15%;
  left: 60%;
  animation-delay: 0s;
}

.signal-field span:nth-child(2) {
  width: 200px;
  height: 200px;
  top: 55%;
  left: 10%;
  animation-delay: 1.5s;
}

.signal-field span:nth-child(3) {
  width: 90px;
  height: 90px;
  top: 70%;
  left: 70%;
  animation-delay: 3s;
}

@keyframes ripple {
  0% { transform: scale(0.6); opacity: 0.3; }
  100% { transform: scale(1.8); opacity: 0; }
}

.auth-brand-top {
  position: relative;
  z-index: 1;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 540;
  letter-spacing: -0.26px;
}

.brand-logo .logo-mark {
  width: 40px;
  height: 40px;
  border-radius: var(--rounded-md);
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--on-primary);
  font-size: 18px;
}

.auth-brand-mid {
  position: relative;
  z-index: 1;
  max-width: 440px;
}

.auth-brand-mid h1 {
  font-size: 64px;
  font-weight: 340;
  line-height: 1.10;
  letter-spacing: -0.96px;
  margin-bottom: var(--spacing-lg);
}

.auth-brand-mid h1 span {
  font-weight: 540;
}

.auth-brand-mid p {
  font-size: 20px;
  font-weight: 330;
  line-height: 1.40;
  letter-spacing: -0.14px;
  opacity: 0.7;
}

.auth-brand-bottom {
  position: relative;
  z-index: 1;
  display: flex;
  gap: var(--spacing-xl);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.60px;
  text-transform: uppercase;
  opacity: 0.6;
}

.auth-brand-bottom strong {
  display: block;
  font-family: var(--font-sans);
  font-size: 24px;
  font-weight: 540;
  letter-spacing: -0.26px;
  text-transform: none;
  margin-bottom: 4px;
  opacity: 1;
}

/* ---- Right: Form Panel ---- */
.auth-form-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xxl);
  background: var(--canvas);
}

.auth-form-card {
  width: 100%;
  max-width: 400px;
}

.auth-form-card .auth-heading {
  margin-bottom: var(--spacing-xl);
}

.auth-form-card .auth-heading h2 {
  font-size: 32px;
  font-weight: 340;
  line-height: 1.25;
  letter-spacing: -0.48px;
  margin-bottom: 8px;
}

.auth-form-card .auth-heading p {
  font-size: 16px;
  font-weight: 330;
  color: var(--ink);
  opacity: 0.6;
}

.form-row-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.remember-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: -6px 0 var(--spacing-lg);
  font-size: 14px;
  font-weight: 330;
}

.checkbox-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  opacity: 0.7;
}

.checkbox-wrap input {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
}

.link-accent {
  color: var(--ink);
  font-weight: 480;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.link-accent:hover {
  opacity: 0.7;
}

.divider {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  font-size: 14px;
  font-weight: 330;
  color: var(--ink);
  opacity: 0.4;
}

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

.oauth-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 12px;
  border-radius: var(--rounded-pill);
  background: var(--canvas);
  border: 1px solid var(--hairline);
  font-weight: 480;
  font-size: 16px;
  transition: background 0.2s var(--ease);
  cursor: pointer;
}

.oauth-btn:hover {
  background: var(--surface-soft);
}

.auth-switch {
  text-align: center;
  margin-top: var(--spacing-lg);
  font-size: 14px;
  font-weight: 330;
  color: var(--ink);
  opacity: 0.6;
}

/* ---- Avatar Upload ---- */
.avatar-upload {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.avatar-upload-preview {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--surface-soft);
  border: 2px dashed var(--hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink);
  opacity: 0.4;
  overflow: hidden;
  flex-shrink: 0;
}

.avatar-upload-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar-upload-btn {
  font-size: 14px;
  font-weight: 480;
  color: var(--ink);
  cursor: pointer;
}

.avatar-upload-btn:hover {
  opacity: 0.7;
}

.avatar-upload input[type="file"] {
  display: none;
}

/* ---- Theme Toggle ---- */
.theme-toggle-fixed {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 10;
}

/* ---- Responsive ---- */
@media (max-width: 960px) {
  .auth-page {
    grid-template-columns: 1fr;
  }

  .auth-brand {
    display: none;
  }
}

@media (max-width: 560px) {
  .auth-form-panel {
    padding: var(--spacing-lg);
  }

  .form-row-split {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .auth-form-card .auth-heading h2 {
    font-size: 26px;
  }
}