/* =====================================================================
   assets/auth.css
   লগইন ও রেজিস্ট্রেশন পেজের জন্য আলাদা, স্বতন্ত্র ডিজাইন সিস্টেম।
   (মূল অ্যাপের assets/app.min.css থেকে ইচ্ছাকৃতভাবে আলাদা — এই দুই পেজের
   নিজস্ব "সুরক্ষিত সেশন" পরিচয় আছে, তবে রঙ মূল অ্যাপের ইন্ডিগো অ্যাকসেন্টের
   সাথে সামঞ্জস্যপূর্ণ রাখা হয়েছে।)
   ===================================================================== */

:root {
  --bg: #08080a;
  --panel: #131316;
  --panel-2: #191a20;
  --panel-3: #1f2027;
  --border: #26262f;
  --border-soft: #1c1c22;
  --ink: #f4f4f6;
  --ink-dim: #a8a8b3;
  --ink-faint: #6c6c78;
  --accent: #6366f1;
  --accent-2: #818cf8;
  --signal-cyan: #22d3ee;
  --signal-violet: #a78bfa;
  --danger: #f87171;
  --danger-bg: rgba(248, 113, 113, 0.1);
  --success: #4ade80;
  --warn: #fbbf24;
  --radius-lg: 20px;
  --radius-md: 13px;
  --radius-sm: 9px;
  --font-display: 'Tiro Bangla', 'Noto Serif Bengali', Georgia, 'Times New Roman', serif;
  --font-body: 'Hind Siliguri', 'Noto Sans Bengali', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}
a { color: inherit; }
img, svg { display: block; }
button { font-family: inherit; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---------------------------------------------------------------------
   শেল লেআউট: বামে ব্র্যান্ড/সিগনেচার প্যানেল, ডানে ফর্ম
   --------------------------------------------------------------------- */
.auth-shell {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  grid-template-columns: 1fr;
}

@media (min-width: 900px) {
  .auth-shell { grid-template-columns: minmax(380px, 460px) 1fr; }
}

/* ---------------------------------------------------------------------
   ব্র্যান্ড প্যানেল — "এনক্রিপ্টেড সেশন" সিগনেচার এলিমেন্ট
   --------------------------------------------------------------------- */
.auth-brand {
  position: relative;
  overflow: hidden;
  padding: 28px 28px 24px;
  background:
    radial-gradient(120% 90% at 8% -10%, rgba(99,102,241,0.28), transparent 55%),
    radial-gradient(90% 70% at 100% 110%, rgba(34,211,238,0.16), transparent 60%),
    #0a0a0e;
  border-bottom: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
}

@media (min-width: 900px) {
  .auth-brand {
    border-bottom: none;
    border-right: 1px solid var(--border-soft);
    padding: 40px 40px 32px;
    min-height: 100vh;
  }
}

.auth-mesh {
  position: absolute;
  inset: -20%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.75;
}
.auth-mesh span {
  position: absolute;
  border-radius: 999px;
  filter: blur(60px);
  animation: auth-drift 22s ease-in-out infinite alternate;
}
.auth-mesh span:nth-child(1) {
  width: 260px; height: 260px; top: 8%; left: 4%;
  background: radial-gradient(circle, rgba(99,102,241,0.55), transparent 70%);
}
.auth-mesh span:nth-child(2) {
  width: 220px; height: 220px; bottom: 6%; right: 0%;
  background: radial-gradient(circle, rgba(34,211,238,0.4), transparent 70%);
  animation-delay: -7s;
}
.auth-mesh span:nth-child(3) {
  width: 180px; height: 180px; bottom: 30%; left: 30%;
  background: radial-gradient(circle, rgba(167,139,250,0.4), transparent 70%);
  animation-delay: -14s;
}
@keyframes auth-drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(24px, -18px) scale(1.08); }
}
@media (prefers-reduced-motion: reduce) {
  .auth-mesh span { animation: none; }
}

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

.auth-brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}
.auth-brand-logo-mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: var(--panel-3);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--accent-2);
  overflow: hidden;
  flex-shrink: 0;
}
.auth-brand-logo-mark img { width: 100%; height: 100%; object-fit: contain; }
.auth-brand-name { font-weight: 600; font-size: 0.95rem; letter-spacing: 0.01em; }

.auth-brand-mid { margin-top: auto; padding-top: 56px; }
@media (min-width: 900px) { .auth-brand-mid { padding-top: 0; } }

.auth-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal-cyan);
  margin-bottom: 16px;
}
.auth-eyebrow .dot {
  width: 6px; height: 6px; border-radius: 999px;
  background: var(--signal-cyan);
  box-shadow: 0 0 0 3px rgba(34,211,238,0.18);
  animation: auth-pulse 1.8s ease-in-out infinite;
}
@keyframes auth-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.75); }
}
@media (prefers-reduced-motion: reduce) {
  .auth-eyebrow .dot { animation: none; }
}

.auth-headline {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.65rem, 3.4vw, 2.35rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 21ch;
  margin: 0 0 14px;
}
.auth-sub {
  color: var(--ink-dim);
  font-size: 0.92rem;
  line-height: 1.65;
  max-width: 36ch;
  margin: 0;
}

.auth-trust-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 13px;
}
.auth-trust-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.83rem;
  color: var(--ink-dim);
}
.auth-trust-list svg {
  flex-shrink: 0;
  width: 15px; height: 15px;
  margin-top: 2px;
  color: var(--accent-2);
}

.auth-brand-bottom {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--border-soft);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
  display: none;
}
@media (min-width: 900px) { .auth-brand-bottom { display: block; } }

/* ---------------------------------------------------------------------
   ফর্ম প্যানেল
   --------------------------------------------------------------------- */
.auth-formside {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 36px 20px 44px;
  position: relative;
}

.auth-back {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--ink-faint);
  text-decoration: none;
  margin-bottom: 22px;
  transition: color .15s ease;
}
.auth-back:hover { color: var(--ink-dim); }
.auth-back svg { width: 14px; height: 14px; }

@media (min-width: 900px) {
  .auth-back { position: absolute; top: 32px; left: 40px; margin-bottom: 0; }
}

.auth-card-wrap { width: 100%; max-width: 380px; }

.auth-card-head { margin-bottom: 26px; }
.auth-card-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 6px;
}
.auth-card-desc { color: var(--ink-faint); font-size: 0.85rem; margin: 0; }

.auth-form { display: flex; flex-direction: column; gap: 15px; }

.field { display: flex; flex-direction: column; gap: 6px; }
.field-label {
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--ink-dim);
  letter-spacing: 0.01em;
}
.field-input-wrap { position: relative; }
.field-input {
  width: 100%;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--ink);
  font-size: 0.92rem;
  font-family: var(--font-body);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease, background .15s ease;
}
.field-input::placeholder { color: var(--ink-faint); }
.field-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.18);
  background: var(--panel-3);
}
.field-input.has-error { border-color: var(--danger); }
.field-input.has-error:focus { box-shadow: 0 0 0 3px rgba(248,113,113,0.16); }
.field-input[type="password"] { padding-right: 42px; }

.field-toggle {
  position: absolute;
  right: 6px; top: 50%; transform: translateY(-50%);
  width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  background: transparent; border: none; color: var(--ink-faint);
  border-radius: 7px; cursor: pointer;
  transition: color .15s ease, background .15s ease;
}
.field-toggle:hover { color: var(--ink-dim); background: var(--panel-3); }
.field-toggle svg { width: 17px; height: 17px; }

.field-hint {
  font-size: 0.72rem;
  color: var(--ink-faint);
  min-height: 1.1em;
}
.field-hint.is-error { color: var(--danger); }
.field-hint.is-warn { color: var(--warn); }

.field-caps {
  display: none;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  color: var(--warn);
  margin-top: 2px;
}
.field-caps.show { display: flex; }
.field-caps svg { width: 12px; height: 12px; }

/* পাসওয়ার্ড-স্ট্রেংথ মিটার (রেজিস্ট্রেশন) */
.strength { display: flex; gap: 4px; margin-top: 2px; }
.strength i {
  flex: 1; height: 3px; border-radius: 999px;
  background: var(--border);
  transition: background .2s ease;
}
.strength[data-level="1"] i:nth-child(1) { background: var(--danger); }
.strength[data-level="2"] i:nth-child(-n+2) { background: var(--warn); }
.strength[data-level="3"] i { background: var(--success); }

.auth-submit {
  margin-top: 4px;
  width: 100%;
  border: none;
  border-radius: var(--radius-sm);
  padding: 13px 16px;
  font-size: 0.92rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 8px 24px -8px rgba(99,102,241,0.55);
  transition: transform .15s ease, box-shadow .15s ease, opacity .15s ease;
  display: flex; align-items: center; justify-content: center; gap: 8px;
}
.auth-submit:hover { transform: translateY(-1px); box-shadow: 0 10px 28px -8px rgba(99,102,241,0.65); }
.auth-submit:active { transform: translateY(0); }
.auth-submit:disabled { opacity: 0.6; cursor: default; transform: none; }

.spinner {
  width: 15px; height: 15px;
  border-radius: 999px;
  border: 2px solid rgba(255,255,255,0.35);
  border-top-color: #fff;
  animation: spin 0.7s linear infinite;
  display: none;
}
.auth-submit.is-loading .spinner { display: inline-block; }
.auth-submit.is-loading .auth-submit-label { opacity: 0.85; }
@keyframes spin { to { transform: rotate(360deg); } }

.auth-divider {
  display: flex; align-items: center; gap: 10px;
  color: var(--ink-faint); font-size: 0.72rem;
  margin: 4px 0;
}
.auth-divider::before, .auth-divider::after {
  content: ''; flex: 1; height: 1px; background: var(--border);
}

.auth-google {
  width: 100%;
  display: flex; align-items: center; justify-content: center; gap: 9px;
  background: #fff; color: #1f1f24;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.88rem; font-weight: 600;
  text-decoration: none;
  transition: background .15s ease, transform .15s ease;
}
.auth-google:hover { background: #eceef4; transform: translateY(-1px); }
.auth-google svg { width: 17px; height: 17px; flex-shrink: 0; }

.auth-alert {
  display: flex; gap: 9px; align-items: flex-start;
  background: var(--danger-bg);
  border: 1px solid rgba(248,113,113,0.3);
  color: #fca5a5;
  padding: 11px 13px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  line-height: 1.5;
}
.auth-alert svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 1px; }

.auth-switch {
  margin-top: 22px;
  text-align: center;
  font-size: 0.83rem;
  color: var(--ink-faint);
}
.auth-switch a { color: var(--accent-2); font-weight: 600; text-decoration: none; }
.auth-switch a:hover { text-decoration: underline; }

.auth-fineprint {
  margin-top: 20px;
  text-align: center;
  font-size: 0.72rem;
  color: var(--ink-faint);
  line-height: 1.6;
}
.auth-fineprint a { color: var(--ink-dim); text-decoration: underline; text-underline-offset: 2px; }

/* --------------------------------------------------------------------
   সিস্টেম-অফ বা "already logged in" স্টেট
   -------------------------------------------------------------------- */
.auth-state-card {
  width: 100%; max-width: 380px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  text-align: center;
}
.auth-state-icon {
  width: 46px; height: 46px; margin: 0 auto 16px;
  border-radius: 12px;
  background: var(--panel-3);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--accent-2);
}
.auth-state-icon svg { width: 22px; height: 22px; }
.auth-state-title { font-family: var(--font-display); font-size: 1.2rem; font-weight: 600; margin: 0 0 8px; }
.auth-state-desc { color: var(--ink-faint); font-size: 0.85rem; line-height: 1.6; margin: 0 0 20px; }
.auth-state-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; text-decoration: none;
  padding: 11px 20px; border-radius: var(--radius-sm);
  font-size: 0.86rem; font-weight: 600;
}

/* focus-visible সব ইন্টারঅ্যাক্টিভ এলিমেন্টের জন্য */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 2px;
}

.auth-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: 0 30px 60px -30px rgba(0,0,0,0.6);
}
@media (min-width: 480px) {
  .auth-card { padding: 34px 32px; }
}