/* Register — AgentOS workspace entrance. Shared visual system with login:
   real-world photo + fractured diagonal boundary + integrated auth panel.
   Tokens only; identity blues #0EA5E9/#0284C7. */

body {
  background: #f4f7fb;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  overflow-x: clip;
  animation: auth-fade 300ms var(--ease-out);
}

@keyframes auth-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* --- Slim top navbar: sticky 64px, white + bottom border --- */
.auth-top {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(148, 163, 184, 0.28);
  backdrop-filter: blur(18px);
  min-height: 64px;
  display: flex;
  align-items: stretch;
  justify-content: center;
}

.auth-top-inner {
  width: 100%;
  max-width: 1440px;
  min-height: 64px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand-group {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-width: 0;
}

.auth-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: none;
}

.auth-nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-decoration: none;
  white-space: nowrap;
}

.auth-nav-link:hover {
  color: var(--color-primary);
}

.auth-nav-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.nav-sibling {
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.nav-sibling:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-subtle);
}

/* EN/VI switcher — same pattern as Home. */
.LangSwitch { display: inline-flex; align-items: center; flex: none; background: var(--color-app-bg); border: 1px solid var(--color-border); border-radius: var(--radius-pill); padding: 2px; }
.LangSwitch-btn { appearance: none; border: none; background: transparent; border-radius: var(--radius-pill); padding: 6px 12px; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.04em; color: var(--color-text-secondary); cursor: pointer; line-height: 1.4; white-space: nowrap; }
.LangSwitch-btn:hover { color: var(--color-primary); }
.LangSwitch-btn[aria-pressed="true"] { background: #fff; color: var(--color-text-primary); box-shadow: var(--shadow-subtle); outline: 1px solid var(--color-border); }
.LangSwitch-btn:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
  border-radius: var(--radius-sm);
}

.brand:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.brand-mark {
  width: 30px;
  height: 30px;
  display: block;
  flex: none;
}

.brand-context {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.01em;
  margin: 0;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: var(--radius-pill);
  background: var(--color-success);
  flex: none;
}

/* --- Full-viewport split: photo 45% + fractured boundary + auth 55% --- */
.auth-wrap {
  position: relative;
  z-index: 1;
  flex: 1;
  display: flex;
  min-width: 0;
}

.auth-split {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 0;
  align-items: stretch;
  min-width: 0;
  min-height: calc(100vh - 65px);
  min-height: calc(100svh - 65px);
}

/* Visual half: z-order background < fracture < photo < tint < caption */
.auth-visual {
  position: relative;
  overflow: hidden;
  min-width: 0;
  min-height: 100%;
  isolation: isolate;
  background: #07111f;
}

.visual-fracture {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: #07111f;
  clip-path: none;
}

.visual-video { position: absolute; inset: 0; z-index: 1; width: 100%; height: 100%; object-fit: cover; object-position: center; opacity: 1; mix-blend-mode: normal; filter: saturate(1.08) contrast(1.2) brightness(0.68); }

@keyframes visual-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.visual-tint {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  clip-path: none;
  background: linear-gradient(180deg,
    rgba(7, 17, 31, 0.12),
    rgba(7, 17, 31, 0.48) 48%,
    rgba(7, 17, 31, 0.94));
}

.visual-caption {
  position: absolute;
  z-index: 3;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-8);
  color: #fff;
}

.visual-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #bae6fd;
  margin: 0 0 var(--space-2);
}

.visual-quote {
  font-size: 1.375rem;
  line-height: 1.35;
  font-weight: 650;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-2);
  text-wrap: balance;
}

.visual-credit {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.72);
  margin: 0;
}

.visual-status {
  position: absolute;
  z-index: 4;
  top: 40px;
  right: 40px;
  width: min(250px, calc(100% - 80px));
  padding: 16px;
  color: #e0f2fe;
  background: rgba(8, 27, 48, 0.64);
  border: 1px solid rgba(186, 230, 253, 0.22);
  border-radius: 12px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(16px);
}

.visual-status-head { display: flex; align-items: center; gap: 8px; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.04em; }
.status-pulse { width: 7px; height: 7px; border-radius: 50%; background: #4ade80; box-shadow: 0 0 0 4px rgba(74, 222, 128, 0.14); }
.visual-status-live { margin-left: auto; color: #86efac; font-size: 0.625rem; letter-spacing: 0.1em; }
.visual-status-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 18px; }
.visual-status-metrics div { display: grid; gap: 2px; min-width: 0; }
.visual-status-metrics strong { color: #fff; font-size: 1rem; line-height: 1.1; }
.visual-status-metrics span { color: #bae6fd; font-size: 0.625rem; line-height: 1.25; }

/* Auth half: integrated panel (not a floating card) */
.auth-card {
  width: 100%;
  max-width: 460px;
  margin: 0 auto;
  min-width: 0;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(148, 163, 184, 0.34);
  border-radius: 16px;
  box-shadow: 0 24px 70px rgba(15, 23, 42, 0.12);
  padding: 40px;
  align-self: center;
  animation: form-in 320ms var(--ease-out) both;
}

.auth-wrap {
  background: linear-gradient(rgba(148, 163, 184, 0.09) 1px, transparent 1px), linear-gradient(90deg, rgba(148, 163, 184, 0.09) 1px, transparent 1px), radial-gradient(circle at 78% 20%, rgba(186, 230, 253, 0.4), transparent 32%), #f4f7fb;
  background-size: 36px 36px, 36px 36px, auto, auto;
}

@keyframes form-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

.auth-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin: 0 0 var(--space-2);
}

.auth-card h1 {
  font-size: clamp(1.75rem, 1.5rem + 1vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-2);
  color: var(--color-text-primary);
}

.auth-sub {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.5;
  margin: 0 0 var(--space-6);
}

/* --- Subtle hierarchy labels for density --- */
.group-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-3);
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border);
}

.group-label:first-of-type {
  border-top: none;
  padding-top: 0;
}

.group-label + .field {
  margin-top: 0;
}

form .group-label ~ .group-label {
  margin-top: var(--space-6);
}

/* --- Fields --- */
.field {
  margin-bottom: var(--space-4);
}

.field label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.field input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: 1rem;
  line-height: 1.5;
  background: rgba(255, 255, 255, 0.92);
  color: var(--color-text-primary);
  transition: border-color var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
}

.field input::placeholder {
  color: var(--color-text-muted);
}

.field input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-subtle);
}

.field-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.field-row label {
  margin-bottom: 0;
}

.hint {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.password-wrap {
  position: relative;
}

.password-wrap input {
  padding-right: 4.5rem;
}

.toggle-password {
  position: absolute;
  right: var(--space-1);
  top: 50%;
  transform: translateY(-50%);
  min-height: 44px;
  min-width: 44px;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  padding: var(--space-2) var(--space-3);
  transition: color var(--duration-fast) var(--ease-out);
}

.toggle-password:hover {
  color: var(--color-text-primary);
}

.toggle-password:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

/* Strength line: reserved height so typing never shifts layout */
.strength {
  min-height: 1.25rem;
  font-size: 0.75rem;
  line-height: 1.25rem;
  color: var(--color-text-secondary);
  margin: var(--space-2) 0 0;
}

.strength[data-level="weak"] {
  color: var(--color-error);
}

.strength[data-level="ok"] {
  color: var(--color-warning);
}

.strength[data-level="strong"] {
  color: var(--color-success);
}

/* Inline errors: smooth reveal, no abrupt jump */
.error {
  display: block;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--color-error);
  margin: 0;
  transition: max-height var(--duration-fast) var(--ease-out), opacity var(--duration-fast) var(--ease-out), margin-top var(--duration-fast) var(--ease-out);
}

.error.visible {
  max-height: 3rem;
  opacity: 1;
  margin-top: var(--space-2);
}

.field.invalid input {
  border-color: var(--color-error);
}

.field.invalid input:focus {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn-primary {
  background: linear-gradient(135deg, #0369a1, #2563eb);
  color: #fff;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #075985, #1d4ed8);
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.22);
}

.btn-primary:active {
  background: #1e40af;
  transform: translateY(0);
}

.btn-block {
  width: 100%;
}

.btn[disabled] {
  opacity: 0.7;
  cursor: wait;
}

#registerSubmit {
  margin-top: var(--space-2);
}

.form-note {
  display: none;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--color-text-secondary);
  background: var(--color-primary-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin: var(--space-4) 0 0;
}

.form-note.visible {
  display: block;
}

/* Passkey upsell (post-registration, benefits first, optional). */
.passkey-promo { border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--space-4); margin-top: var(--space-4); background: var(--color-surface); }
.passkey-promo[hidden] { display: none; }
.passkey-promo p { font-size: 0.875rem; margin: 0 0 var(--space-2); }
.passkey-promo ul { margin: 0 0 var(--space-3); padding-left: var(--space-4); font-size: 0.8125rem; color: var(--color-text-secondary); display: grid; gap: var(--space-1); }
.passkey-promo-actions { display: flex; gap: var(--space-3); flex-wrap: wrap; }
.passkey-promo .btn { padding: var(--space-2) var(--space-4); font-size: 0.875rem; }

.auth-switch {
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin: var(--space-6) 0 0;
  line-height: 1.5;
}

.auth-switch a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-xs);
}

.auth-switch a:hover {
  text-decoration: underline;
}

.auth-switch a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* --- Responsive: compact photo header + simplified diagonal, form first-class --- */
@media (max-width: 900px) {
  .auth-split {
    grid-template-columns: minmax(0, 1fr);
    min-height: 0;
  }

  .auth-visual {
    min-height: 220px;
    max-height: 260px;
  }

  .visual-fracture {
    display: none;
  }

  .visual-tint {
    clip-path: none;
  }

  .visual-caption {
    right: 0;
    padding: var(--space-4) var(--space-6);
  }

  .visual-status { top: 24px; right: 24px; }

  .visual-quote {
    font-size: 1.0625rem;
  }

  .visual-credit {
    display: none;
  }

  .auth-card {
    padding: 32px 24px 48px;
    max-width: 480px;
  }
}

@media (max-width: 640px) {
  .brand-context {
    display: none;
  }

  .auth-top-inner {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
}

@media (max-width: 560px) {
  .auth-top,
  .auth-top-inner {
    min-height: 60px;
  }

  .nav-home {
    display: none;
  }

  .auth-visual {
    min-height: 180px;
    max-height: 210px;
  }

  .auth-card {
    padding: var(--space-6) var(--space-4) var(--space-12);
  }
}

@media (max-width: 390px) {
  .auth-top-inner,
  .auth-wrap,
  .auth-split,
  .auth-visual,
  .auth-card {
    min-width: 0;
    max-width: 100%;
  }

  .auth-nav-link {
    padding-left: var(--space-2);
    padding-right: var(--space-2);
  }
}

@supports not (overflow: clip) {
  body { overflow-x: hidden; }
}

@media (prefers-reduced-motion: reduce) {
  body {
    animation: none;
  }

  .visual-video,
  .auth-card {
    animation: none;
  }

  .btn,
  .field input,
  .error,
  .toggle-password {
    transition: none;
  }
}

/* ===== Enterprise form polish ===== */
.auth-card { max-width: 440px; padding: 44px 40px; }
.auth-eyebrow { display: inline-flex; align-items: center; gap: 8px; }
.auth-eyebrow::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--color-success); box-shadow: 0 0 0 4px rgba(22, 163, 74, 0.12); }
.auth-card h1 { font-size: clamp(1.9rem, 1.65rem + 0.8vw, 2.25rem); font-weight: 750; letter-spacing: -0.025em; }
.auth-sub { max-width: 34rem; }
.field label { font-weight: 700; }
.field input { min-height: 46px; border-color: #cbd5e1; box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03); }
.field input:hover { border-color: #94a3b8; }
.field input:focus { box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.14), 0 2px 5px rgba(15, 23, 42, 0.06); }
.btn { min-height: 46px; font-weight: 700; }
.btn-primary { box-shadow: 0 5px 12px rgba(37, 99, 235, 0.16); }
.btn-secondary { background: rgba(255, 255, 255, 0.7); border-color: #cbd5e1; }
.auth-switch { margin-top: var(--space-5); }

/* ===== ThemeToggle — sun/moon icon button ===== */
.ThemeToggle {
  appearance: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-text-secondary);
  flex: none;
  transition: color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out), background var(--duration-fast) var(--ease-out);
}
.ThemeToggle:hover { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-primary-subtle); }
.ThemeToggle:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.ThemeToggle-sun { display: block; }
.ThemeToggle-moon { display: none; }
html.dark .ThemeToggle-sun { display: none; }
html.dark .ThemeToggle-moon { display: block; }

/* ===== Dark mode: VS Code black, forced contrast ===== */
html.dark {
  --color-surface: #1E1E1E;
  --color-app-bg: #252526;
  --color-surface-subtle: #252526;
  --color-text-primary: #FFFFFF;
  --color-text-secondary: #CCCCCC;
  --color-text-muted: #A6A6A6;
  --color-border: #3E3E3E;
  --color-border-strong: #5A5A5A;
  --color-primary: #58a6ff;
  --color-primary-hover: #79c0ff;
  --color-primary-active: #388bfd;
  --color-primary-subtle: rgba(56, 139, 253, 0.1);
}
html.dark body {
  background: #111111;
  color: var(--color-text-primary);
}
html.dark .auth-top { background: #1E1E1E; border-color: var(--color-border); }
html.dark .auth-visual { background: #111111; }
html.dark .auth-wrap { background-color: #111111; }
html.dark .auth-card { background: rgba(30, 30, 30, 0.94); border-color: var(--color-border); box-shadow: 0 24px 70px rgba(0, 0, 0, 0.5); }
html.dark .field input { background: #2D2D2D; border-color: var(--color-border); color: var(--color-text-primary); }
html.dark .field input:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15); }
html.dark .field.invalid input { border-color: var(--color-error); }
html.dark .btn-primary { background: var(--color-primary); color: #fff; }
html.dark .btn-secondary { background: #2D2D2D; color: var(--color-text-primary); border-color: var(--color-border); }
html.dark .form-note { background: rgba(56, 139, 253, 0.08); border-color: var(--color-border); }
html.dark .passkey-promo { background: #2D2D2D; border-color: var(--color-border); }
html.dark .LangSwitch { background: #2D2D2D; border-color: var(--color-border); }
html.dark .LangSwitch-btn[aria-pressed="true"] { background: #3E3E3E; color: var(--color-text-primary); outline-color: var(--color-border); }

@media (prefers-reduced-motion: reduce) {
  .ThemeToggle { transition: none; }
}

/* Smooth page entry (matches app pages) */
@keyframes page-in { from { opacity: 0; transform: translateY(6px); } }

.auth-wrap { animation: page-in 0.28s ease-out; }