:root {
  color-scheme: light;
  --bg:#F4F7FC; --bg2:#EDF2FA; --card:#FFFFFF; --rail:#FBFCFE;
  --surface:#FFFFFF; --surface-2:#EDF2FA; --surface-3:#E2E9F4;
  --text:#1B1D21; --muted:#5C636B; --subtle:#8A9198;
  --hair:rgba(26,54,110,.09); --hair2:rgba(26,54,110,.06);
  --blue:#1A73E8; --violet:#7C5CD6; --magenta:#C2417F; --cyan:#0E7F9E;
  --spark-blue:#4285F4; --spark-violet:#9B72CB; --spark-coral:#D96570;
  --spark-magenta:#FF7AC8; --spark-cyan:#72E4FF; --on-spark:#FFFFFF;
  --g-spark:linear-gradient(135deg,var(--spark-blue),var(--spark-violet) 55%,var(--spark-coral));
  --g-name:linear-gradient(96deg,#1A73E8,#7C5CD6 55%,#C2417F);
  --g-bloom:radial-gradient(ellipse 62% 46% at 50% 0%,rgba(66,133,244,.18),transparent 70%);
  --g-aura:radial-gradient(ellipse 50% 50% at 50% 42%,rgba(66,133,244,.22),transparent 70%);
  --blue-c:#E7F0FE; --blue-t:#124FA6;
  --grn-c:#E3F3E8; --grn-t:#1E6A34;
  --pur-c:#F0E9FD; --pur-t:#5A34A6;
  --cor-c:#FCE7E4; --cor-t:#B23B2E;
  --warn-c:#FEF3D9; --warn-t:#8A5A00;
  --sh-sm:0 1px 2px rgba(30,50,110,.06);
  --sh-md:0 6px 20px rgba(40,70,150,.08);
  --sh-lg:0 18px 48px rgba(40,80,170,.16),0 2px 8px rgba(30,50,110,.06);
  --edge:none; --outline:rgba(26,54,110,.12);
  --r-full:999px; --r-lg:28px; --r-md:16px; --r-sm:12px; --r-xs:8px;
  --ease:cubic-bezier(.2,0,0,1); --spring:cubic-bezier(.34,1.56,.64,1);
  --font:Inter,'Noto Sans SC',system-ui,sans-serif;
  --mono:'Roboto Mono',ui-monospace,monospace;

  --ph-console-primary: var(--blue);
  --ph-console-primary-hover: var(--blue-t);
  --ph-console-primary-soft: var(--blue-c);
  --ph-console-primary-ring: rgba(66, 133, 244, 0.2);
  --ph-console-text: var(--text);
  --ph-console-text-muted: var(--muted);
  --ph-console-text-placeholder: var(--subtle);
  --ph-console-border: var(--hair);
  --ph-console-border-soft: var(--hair2);
  --ph-console-surface: var(--surface);
  --ph-console-surface-muted: var(--surface-2);
  --ph-console-surface-hover: var(--surface-3);
  --ph-console-shadow-sm: var(--sh-sm);
  --ph-console-shadow-lg: var(--sh-lg);
  --ph-console-danger: var(--cor-t);
  --ph-console-success: var(--grn-t);
  
  --signature-gradient: var(--g-name);
  --signature-glow: var(--g-bloom);
  --bg-gradient: none;
  --topbar-bg: color-mix(in srgb, var(--surface) 85%, transparent);
  --ph-btn-reg-color: #FFFFFF;
  --ph-btn-reg-bg: var(--ph-console-text);
  --ph-btn-submit-color: #FFFFFF;
  --ph-dot-claude: #D97757;
  --ph-dot-gemini: #4285F4;
  --ph-dot-gpt: #10A37F;
}

@media (prefers-color-scheme: dark) {
  :root {
  color-scheme: dark;
  --bg:#000000; --bg2:#050507; --card:rgba(18,19,24,.86); --rail:rgba(9,10,14,.88);
  --surface:rgba(16,17,22,.88); --surface-2:rgba(23,25,34,.90); --surface-3:rgba(33,36,49,.92);
  --text:#EAEBED; --muted:#9AA0A6; --subtle:#6E7378;
  --hair:rgba(255,255,255,.08); --hair2:rgba(255,255,255,.05);
  --blue:#8AB4F8; --violet:#B79CFF; --magenta:#FF7AC8; --cyan:#72E4FF;
  --spark-blue:#4285F4; --spark-violet:#8A5CFF; --on-spark:#FFFFFF;
  --g-spark:linear-gradient(100deg,#4285F4 0%,#8A5CFF 35%,#FF7AC8 68%,#72E4FF 100%);
  --g-name:linear-gradient(96deg,#8AB4F8,#B79CFF 45%,#FF7AC8 78%,#72E4FF);
  --g-bloom:radial-gradient(ellipse 62% 46% at 50% 0%,rgba(66,133,244,.34),transparent 70%);
  --g-aura:radial-gradient(ellipse 50% 50% at 50% 42%,rgba(66,133,244,.42),transparent 70%);
  --blue-c:rgba(138,180,248,.14); --blue-t:#AECBFB;
  --grn-c:rgba(147,211,166,.13); --grn-t:#93D3A6;
  --pur-c:rgba(183,156,255,.15); --pur-t:#CDB6F2;
  --cor-c:rgba(255,122,200,.14); --cor-t:#FFB5DD;
  --warn-c:rgba(240,206,122,.13); --warn-t:#F0CE7A;
  --sh-sm:0 1px 2px rgba(0,0,0,.4);
  --sh-md:0 8px 24px rgba(0,0,0,.45);
  --sh-lg:0 20px 50px rgba(0,0,0,.55);
  --edge:inset 0 1px 0 rgba(255,255,255,.05);
  --outline:rgba(255,255,255,.09);
  --g-ambient:
    radial-gradient(circle at 18% 12%,rgba(66,133,244,.42),transparent 34%),
    radial-gradient(circle at 78% 0%,rgba(183,156,255,.36),transparent 30%),
    radial-gradient(circle at 52% 88%,rgba(255,122,200,.24),transparent 36%),
    radial-gradient(circle at 90% 72%,rgba(114,228,255,.18),transparent 28%);
    
  --ph-console-primary: var(--blue);
  --ph-console-primary-hover: var(--blue-t);
  --ph-console-primary-soft: var(--blue-c);
  --ph-console-primary-ring: rgba(138, 180, 248, 0.24);
  --ph-console-text: var(--text);
  --ph-console-text-muted: var(--muted);
  --ph-console-text-placeholder: var(--subtle);
  --ph-console-border: var(--hair);
  --ph-console-border-soft: var(--hair2);
  --ph-console-surface: var(--surface);
  --ph-console-surface-muted: var(--surface-2);
  --ph-console-surface-hover: var(--surface-3);
  --ph-console-shadow-sm: var(--sh-sm);
  --ph-console-shadow-lg: var(--sh-lg);
  --ph-console-danger: var(--cor-t);
  --ph-console-success: var(--grn-t);
  
  --signature-gradient: var(--g-name);
  --signature-glow: var(--g-bloom);
  --bg-gradient: none;
  --topbar-bg: color-mix(in srgb, var(--surface) 85%, transparent);
  --ph-btn-reg-color: #202124;
  --ph-btn-reg-bg: #E8EAED;
  --ph-btn-submit-color: #202124;
  }
  html, body {
    background: var(--bg);
  }
}

.gemini-ambient {
  position: fixed;
  inset: -30%;
  z-index: -1;
  pointer-events: none;
  background: var(--g-ambient), var(--bg);
  filter: blur(42px) saturate(1.16);
  opacity: .82;
  animation: geminiAmbientDrift 20s ease-in-out infinite alternate;
  display: none;
}

@media (prefers-color-scheme: dark) {
  .gemini-ambient {
    display: block;
  }
}

@keyframes geminiAmbientDrift {
  0% { transform: translate3d(-6%, -4%, 0) scale(1); opacity: .66; }
  50% { transform: translate3d(5%, 4%, 0) scale(1.08); opacity: .88; }
  100% { transform: translate3d(8%, -6%, 0) scale(1.04); opacity: .74; }
}

@media (prefers-reduced-motion: reduce) {
  .gemini-ambient { animation: none; opacity: .58; }
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: "Google Sans", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--ph-console-text);
  background: var(--ph-console-surface);
  background-image: var(--bg-gradient);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-variant-numeric: tabular-nums;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease;
}

button, input {
  font-family: inherit;
  margin: 0;
}

/* ================== Topbar ================== */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  display: flex;
  align-items: center;
  padding: 0 32px;
  background: var(--topbar-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--ph-console-border-soft);
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ph-console-text);
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--signature-gradient);
  box-shadow: 0 2px 8px rgba(123, 92, 255, 0.3);
}

.nav {
  display: flex;
  gap: 32px;
  margin-left: 48px;
}

.nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ph-console-text-muted);
}

.nav a:hover {
  color: var(--ph-console-text);
}

.top-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}

.login-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--ph-console-text);
  padding: 8px 16px;
  border-radius: 999px;
  transition: background 0.2s ease;
}

.login-link:hover {
  background: var(--ph-console-surface-hover);
}

.register-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--ph-btn-reg-color);
  background: var(--ph-btn-reg-bg);
  padding: 8px 20px;
  border-radius: 999px;
  transition: opacity 0.2s ease;
}

.register-link:hover {
  opacity: 0.9;
}

/* ================== Layout ================== */
.auth-layout {
  display: flex;
  min-height: 100vh;
  padding: 120px 5% 60px;
  max-width: 1440px;
  margin: 0 auto;
  align-items: center;
  justify-content: center;
  gap: 8%;
}

@media (max-width: 1024px) {
  .auth-layout {
    flex-direction: column;
    padding-top: 100px;
    gap: 60px;
  }
  .auth-hero {
    text-align: center;
    max-width: 600px;
  }
  .hero-content {
    align-items: center;
  }
  .nav {
    display: none;
  }
}

/* ================== Hero Section ================== */
.auth-hero {
  flex: 1;
  max-width: 540px;
}

.hero-content {
  display: flex;
  flex-direction: column;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ph-console-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.eyebrow-line {
  width: 32px;
  height: 2px;
  background: var(--ph-console-border);
}

.hero-title {
  font-size: clamp(40px, 5vw, 56px);
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.03em;
  margin: 0 0 24px 0;
  color: var(--ph-console-text);
}

.gradient-text {
  background: var(--signature-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-sub {
  font-size: 16px;
  line-height: 1.6;
  color: var(--ph-console-text-muted);
  margin: 0 0 48px 0;
  font-weight: 400;
}

/* The Signature Capsules */
.hero-signature {
  position: relative;
  height: 120px;
  display: flex;
  align-items: center;
}

@media (max-width: 1024px) {
  .hero-signature {
    justify-content: center;
  }
}

.signature-glow {
  position: absolute;
  top: 50%;
  left: 20%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  background: var(--signature-glow);
  z-index: 0;
  pointer-events: none;
  border-radius: 50%;
  filter: blur(40px);
}

@media (max-width: 1024px) {
  .signature-glow {
    left: 50%;
  }
}

.capsule-group {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
}

.capsule {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ph-console-text);
  margin-left: -20px;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease;
}

@media (prefers-color-scheme: dark) {
  .capsule {
    background: rgba(32, 33, 36, 0.7);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  }
}

.capsule:first-child {
  margin-left: 0;
}

.capsule:hover {
  transform: translateY(-4px);
  z-index: 10;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

@media (prefers-color-scheme: dark) {
  .capsule:hover {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6);
  }
}

.capsule-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.capsule-claude { z-index: 3; }
.capsule-claude .capsule-dot { background: var(--ph-dot-claude); }

.capsule-gemini { z-index: 2; }
.capsule-gemini .capsule-dot { background: var(--ph-dot-gemini); }

.capsule-gpt { z-index: 1; }
.capsule-gpt .capsule-dot { background: var(--ph-dot-gpt); }


/* ================== Form Panel ================== */
.auth-panel {
  flex: 0 0 440px;
  width: 100%;
  position: relative;
}

@media (max-width: 600px) {
  .auth-panel {
    flex-basis: auto;
  }
}

.card-glow {
  position: absolute;
  top: -20px;
  left: -20px;
  right: -20px;
  bottom: -20px;
  background: var(--signature-gradient);
  opacity: 0.05;
  border-radius: 40px;
  filter: blur(24px);
  z-index: 0;
}

@media (prefers-color-scheme: dark) {
  .card-glow {
    opacity: 0.1;
  }
}

.auth-card-wrapper {
  position: relative;
  z-index: 1;
  background: var(--ph-console-surface);
  border-radius: 28px;
  padding: 40px;
  box-shadow: var(--ph-console-shadow-lg);
  border: 1px solid var(--ph-console-border-soft);
}

@media (max-width: 500px) {
  .auth-card-wrapper {
    padding: 32px 24px;
  }
}

/* Visibility toggling based on body[data-mode] */
.auth-card {
  display: none;
  animation: fade-in 0.3s ease-out forwards;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

body[data-mode="login"] #login-form,
body[data-mode="register"] #register-form,
body[data-mode="reset-request"] #reset-request-form,
body[data-mode="reset-confirm"] #reset-confirm-form {
  display: block;
}

/* Typography inside card */
.card-header {
  margin-bottom: 32px;
}

.card-header h2 {
  margin: 0 0 8px 0;
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ph-console-text);
}

.card-desc {
  margin: 0;
  font-size: 14px;
  color: var(--ph-console-text-muted);
}

/* Form Fields */
.form-fields {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.field-row {
  display: flex;
  gap: 16px;
}

@media (max-width: 500px) {
  .field-row {
    flex-direction: column;
    gap: 20px;
  }
}

.field-row > * {
  flex: 1;
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--ph-console-text);
}

.field-note {
  font-size: 12px;
  color: var(--ph-console-text-muted);
  line-height: 1.4;
}

.invite-code-field.has-code .input-wrap input {
  border-color: var(--ph-console-primary);
  box-shadow: 0 0 0 3px var(--ph-console-primary-ring);
}

.invite-code-field.has-code .field-note {
  color: var(--ph-console-primary);
}

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

input {
  width: 100%;
  height: 48px;
  padding: 0 16px;
  background: var(--ph-console-surface-muted);
  border: 1px solid transparent;
  border-radius: 12px;
  font-size: 14px;
  color: var(--ph-console-text);
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

input::placeholder {
  color: var(--ph-console-text-placeholder);
}

input:hover {
  background: var(--ph-console-surface-hover);
}

input:focus {
  outline: none;
  background: var(--ph-console-surface);
  border-color: var(--ph-console-primary);
  box-shadow: 0 0 0 3px var(--ph-console-primary-ring);
}

/* Eye Button */
.eye-btn {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  padding: 4px;
  color: var(--ph-console-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  transition: color 0.2s ease, background 0.2s ease;
}

.eye-btn:hover {
  color: var(--ph-console-text);
  background: var(--ph-console-surface-hover);
}

/* Inline Action Button (Send Code) */
.with-action {
  display: flex;
  gap: 8px;
}

.with-action input {
  flex: 1;
}

.action-btn {
  height: 48px;
  padding: 0 16px;
  background: var(--ph-console-surface-muted);
  border: 1px solid var(--ph-console-border);
  border-radius: 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ph-console-text);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.action-btn:hover {
  background: var(--ph-console-surface-hover);
}

.action-btn:focus {
  outline: none;
  border-color: var(--ph-console-primary);
  box-shadow: 0 0 0 3px var(--ph-console-primary-ring);
}

.action-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Form Actions */
.form-actions {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.submit-btn {
  width: 100%;
  height: 48px;
  background: var(--ph-console-primary);
  color: var(--ph-btn-submit-color);
  border: none;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 2px 8px var(--ph-console-primary-soft);
}

.submit-btn:hover {
  background: var(--ph-console-primary-hover);
  box-shadow: 0 4px 12px var(--ph-console-primary-soft);
}

.submit-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--ph-console-primary-ring);
}

.submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.form-links {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--ph-console-text-muted);
}

.form-links.center {
  justify-content: center;
}

.link-sep {
  width: 1px;
  height: 12px;
  background: var(--ph-console-border);
  margin: 0 12px;
}

.text-link {
  color: var(--ph-console-text-muted);
  font-weight: 500;
}

.text-link:hover {
  color: var(--ph-console-text);
}

.text-link.primary {
  color: var(--ph-console-primary);
  margin-left: 4px;
}

.text-link.primary:hover {
  color: var(--ph-console-primary-hover);
}

/* Message */
.message {
  margin-top: 20px;
  padding: 12px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  text-align: center;
  background: var(--ph-console-primary-soft);
  color: var(--ph-console-primary);
  display: none;
}

.message:not(:empty) {
  display: block;
}

.message.error {
  background: rgba(217, 48, 37, 0.1);
  color: var(--ph-console-danger);
}

@media (prefers-color-scheme: dark) {
  .message.error {
    background: rgba(242, 139, 130, 0.1);
  }
}

/* Footer */
.footer {
  position: absolute;
  bottom: 24px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 12px;
  color: var(--ph-console-text-muted);
  font-family: monospace;
}

/* Focus visibility for accessibility */
input:focus-visible,
button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--ph-console-primary) !important;
  outline-offset: 2px !important;
}

/* Space Canvas (Hide since it's the old design, but keeping selectors to prevent JS errors if any) */
.space-bg, .space-canvas, .space-grid {
  display: none !important;
}

/* Prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}