/* ═══════════════════════════════════════════════════════════════════════
   auth.css — JagChess sign in / create account
   ═══════════════════════════════════════════════════════════════════════ */

:root {
  --green:      #58cc02;
  --green-hi:   #61e002;
  --green-dark: #46a302;
  --green-soft: #eef9e2;
  --blue:       #1cb0f6;
  --blue-dark:  #1590cc;
  --blue-soft:  #e4f4fd;
  --gold:       #ffc800;
  --orange:     #ff9600;
  --red:        #ff4b4b;
  --red-dark:   #d93a3a;
  --red-soft:   #ffeaea;
  --ink:        #0e2a36;
  --ink-2:      #123240;
  --bg:         #ffffff;
  --bg-alt:     #f5f9fb;
  --border:     #e4ebf0;
  --border-2:   #d3dee6;
  --text:       #12262f;
  --text-2:     #526b7a;
  --muted:      #7b93a1;

  --font:    'Nunito', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-ui: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --ease:    cubic-bezier(.22,.68,0,1);
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3 { font-family: var(--font); font-weight: 900; letter-spacing: -0.03em; margin: 0; }
a { color: var(--blue); text-decoration: none; }

.auth {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  min-height: 100vh;
}

/* ── LEFT: BRAND PANEL ──────────────────────────────────────────────── */

.auth-brand {
  position: relative;
  overflow: hidden;
  padding: 42px 56px;
  display: flex;
  flex-direction: column;
  background: linear-gradient(155deg, var(--ink-2) 0%, var(--ink) 60%, #071c25 100%);
  color: #fff;
}
.auth-brand::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-conic-gradient(rgba(255,255,255,.03) 0% 25%, transparent 0% 50%) 0 0 / 56px 56px;
}
.auth-brand::after {
  content: '';
  position: absolute;
  width: 620px;
  height: 620px;
  right: -220px;
  top: -180px;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(88,204,2,.22), transparent 70%);
}
.auth-brand > * { position: relative; z-index: 1; }

.ab-logo { display: flex; align-items: center; gap: 12px; color: #fff; }
.ab-mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(160deg, var(--green-hi), var(--green-dark));
  box-shadow: 0 3px 0 #2f7a06, inset 0 1px 0 rgba(255,255,255,.35);
  display: grid;
  place-items: center;
  font-size: 24px;
  color: #fff;
}
.ab-name { font-family: var(--font); font-size: 22px; font-weight: 900; letter-spacing: -0.03em; }

.ab-body { margin: auto 0; padding: 40px 0; }
.ab-body h1 {
  font-size: clamp(30px, 3vw, 44px);
  line-height: 1.1;
  color: #fff;
  margin-bottom: 18px;
  max-width: 15ch;
}
.ab-body p {
  font-size: 16.5px;
  color: rgba(255,255,255,.68);
  max-width: 40ch;
  margin: 0 0 32px;
}

.ab-points { display: grid; gap: 14px; }
.ab-point { display: flex; align-items: center; gap: 13px; font-size: 15px; font-weight: 600; color: rgba(255,255,255,.86); }
.ab-point i {
  width: 34px;
  height: 34px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  font-style: normal;
  font-size: 17px;
  background: rgba(255,255,255,.09);
  border: 1px solid rgba(255,255,255,.12);
  flex-shrink: 0;
}

.ab-foot {
  font-size: 13px;
  color: rgba(255,255,255,.38);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.ab-foot a { color: rgba(255,255,255,.6); }
.ab-foot a:hover { color: #fff; }

/* floating 3-D board */
.ab-board {
  position: absolute;
  right: -40px;
  bottom: -40px;
  width: 340px;
  height: 340px;
  perspective: 900px;
  z-index: 0;
  opacity: .75;
}
.ab-board-inner {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  border-radius: 10px;
  overflow: hidden;
  transform: rotateX(60deg) rotateZ(-40deg);
  animation: ab-float 10s ease-in-out infinite;
  box-shadow: 0 50px 60px rgba(0,0,0,.4);
}
.ab-board-inner i { background: rgba(255,255,255,.07); }
.ab-board-inner i.d { background: rgba(88,204,2,.32); }
@keyframes ab-float {
  0%, 100% { transform: rotateX(60deg) rotateZ(-40deg) translateZ(0); }
  50%      { transform: rotateX(56deg) rotateZ(-35deg) translateZ(22px); }
}

/* ── RIGHT: FORM PANEL ──────────────────────────────────────────────── */

.auth-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 40px;
  background: var(--bg);
}

.auth-card { width: 100%; max-width: 412px; }

.auth-back {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 800;
  color: var(--muted);
  margin-bottom: 26px;
  transition: color .16s;
}
.auth-back:hover { color: var(--text); }
.auth-back svg { width: 16px; height: 16px; }

.auth-head { margin-bottom: 24px; }
.auth-head h2 { font-size: 30px; margin-bottom: 6px; }
.auth-head p { margin: 0; font-size: 15px; color: var(--text-2); }

/* tabs */
.auth-tabs {
  display: flex;
  gap: 4px;
  padding: 5px;
  border-radius: 999px;
  background: var(--bg-alt);
  border: 2px solid var(--border);
  margin-bottom: 26px;
}
.auth-tab {
  flex: 1;
  border: none;
  background: transparent;
  border-radius: 999px;
  padding: 10px 16px;
  font-family: var(--font);
  font-size: 14.5px;
  font-weight: 800;
  color: var(--text-2);
  cursor: pointer;
  transition: background .22s var(--ease), color .22s, box-shadow .22s;
}
.auth-tab.on {
  background: #fff;
  color: var(--text);
  box-shadow: 0 2px 4px rgba(18,38,47,.1);
}

/* form */
.field { margin-bottom: 16px; }
.field label {
  display: block;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 800;
  color: var(--text-2);
  margin-bottom: 7px;
}
.field-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.field-row a { font-family: var(--font); font-size: 13px; font-weight: 800; }

.input-wrap { position: relative; }
.input-wrap > svg {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  width: 19px;
  height: 19px;
  color: var(--muted);
  pointer-events: none;
  transition: color .18s;
}
.input-wrap:focus-within > svg { color: var(--blue); }

input[type="text"], input[type="email"], input[type="password"] {
  width: 100%;
  border: 2px solid var(--border);
  border-radius: 14px;
  background: #fff;
  color: var(--text);
  padding: 14px 15px 14px 46px;
  font-family: var(--font-ui);
  font-size: 15px;
  outline: none;
  transition: border-color .18s var(--ease), box-shadow .18s var(--ease);
}
input::placeholder { color: #a8b9c4; }
input:hover { border-color: var(--border-2); }
input:focus { border-color: var(--blue); box-shadow: 0 0 0 4px rgba(28,176,246,.15); }
input.bad { border-color: var(--red); box-shadow: 0 0 0 4px rgba(255,75,75,.13); }

.peek {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: background .16s, color .16s;
}
.peek:hover { background: var(--bg-alt); color: var(--text); }
.peek svg { width: 19px; height: 19px; }

/* password strength */
.strength { display: flex; align-items: center; gap: 9px; margin-top: 10px; }
.strength-bars { display: flex; gap: 4px; flex: 1; }
.strength-bars i {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  background: var(--border);
  transition: background .3s var(--ease);
}
.strength-label {
  font-family: var(--font);
  font-size: 12px;
  font-weight: 800;
  color: var(--muted);
  min-width: 54px;
  text-align: right;
}
.strength[data-level="1"] .strength-bars i:nth-child(-n+1) { background: var(--red); }
.strength[data-level="2"] .strength-bars i:nth-child(-n+2) { background: var(--orange); }
.strength[data-level="3"] .strength-bars i:nth-child(-n+3) { background: var(--gold); }
.strength[data-level="4"] .strength-bars i { background: var(--green); }
.strength[data-level="1"] .strength-label { color: var(--red-dark); }
.strength[data-level="2"] .strength-label { color: #b96b00; }
.strength[data-level="3"] .strength-label { color: #b08800; }
.strength[data-level="4"] .strength-label { color: var(--green-dark); }

.check-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-2);
  cursor: pointer;
  user-select: none;
  margin-bottom: 20px;
}
.check-row input {
  width: 20px;
  height: 20px;
  accent-color: var(--green);
  cursor: pointer;
}

/* buttons */
.btn3d {
  --sh: var(--green-dark);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  width: 100%;
  padding: 15px 24px;
  border: 2px solid transparent;
  border-radius: 15px;
  background: var(--green);
  color: #fff;
  font-family: var(--font);
  font-size: 15.5px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 4px 0 var(--sh);
  transition: transform .1s var(--ease), box-shadow .1s var(--ease), background .18s, opacity .18s;
}
.btn3d:hover:not(:disabled) { background: var(--green-hi); }
.btn3d:active:not(:disabled) { transform: translateY(4px); box-shadow: 0 0 0 var(--sh); }
.btn3d:disabled { opacity: .6; cursor: not-allowed; }

.btn3d.white {
  background: #fff;
  color: var(--text);
  border-color: var(--border);
  --sh: var(--border-2);
}
.btn3d.white:hover:not(:disabled) { background: var(--bg-alt); }
.btn3d svg { width: 19px; height: 19px; }

.spin {
  width: 17px;
  height: 17px;
  border: 2.5px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.or {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 20px 0;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
}
.or::before, .or::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* alerts */
.alert {
  display: none;
  align-items: flex-start;
  gap: 11px;
  padding: 13px 15px;
  border-radius: 14px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 18px;
  animation: alert-in .28s var(--ease) both;
}
.alert.show { display: flex; }
.alert svg { width: 19px; height: 19px; flex-shrink: 0; margin-top: 1px; }
.alert.error { background: var(--red-soft); color: var(--red-dark); }
.alert.ok { background: var(--green-soft); color: var(--green-dark); }
@keyframes alert-in { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }

.auth-swap {
  margin-top: 22px;
  text-align: center;
  font-size: 14.5px;
  color: var(--text-2);
}
.auth-swap button {
  border: none;
  background: none;
  padding: 0;
  font-family: var(--font);
  font-size: 14.5px;
  font-weight: 800;
  color: var(--green-dark);
  cursor: pointer;
}
.auth-swap button:hover { text-decoration: underline; }

.legal { margin-top: 18px; font-size: 12.5px; color: var(--muted); text-align: center; }

/* pane transitions */
.pane { display: none; }
.pane.on { display: block; animation: pane-in .34s var(--ease) both; }
@keyframes pane-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* ── MODALS ─────────────────────────────────────────────────────────── */

.acct-modal {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: none;
  place-items: center;
  padding: 24px;
  background: rgba(12,32,42,.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.acct-modal.show { display: grid; }
.acct-card {
  width: min(400px, 100%);
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 24px;
  padding: 34px 30px;
  text-align: center;
  box-shadow: 0 30px 60px -24px rgba(9,40,54,.5);
  animation: alert-in .3s var(--ease) both;
}
.acct-card .acct-ico {
  width: 66px;
  height: 66px;
  margin: 0 auto 16px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 28px;
  background: var(--red-soft);
}
.acct-card h3 { font-size: 21px; margin-bottom: 10px; }
.acct-card p { font-size: 14.5px; color: var(--text-2); margin: 0 0 24px; }

/* ── RESPONSIVE ─────────────────────────────────────────────────────── */

@media (max-width: 980px) {
  .auth { grid-template-columns: 1fr; }
  .auth-brand { display: none; }
  .auth-panel { padding: 40px 24px; align-items: flex-start; }
  .auth-card { padding-top: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}