* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

body {
  background: #0a0a0a;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 16px;
  background-image: radial-gradient(circle at 30% 20%, #141414 0%, #060606 90%);
}

.container {
  width: 100%;
  max-width: 380px;
  position: relative;
  min-height: 300px;
}

.page {
  background: #111111;
  border-radius: 20px;
  padding: 24px 20px 18px;
  box-shadow: 0 30px 70px rgba(0,0,0,0.9), 0 0 0 1px rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.02);
  width: 100%;
  position: relative;
  will-change: transform, opacity;
}

.page.hidden { display: none; }

.page-enter { animation: fadeScale 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards; }
.page-exit  { animation: fadeOut 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards; }

@keyframes fadeScale {
  0%   { opacity: 0; transform: scale(0.94) translateY(20px); filter: blur(8px); }
  40%  { filter: blur(2px); }
  100% { opacity: 1; transform: scale(1) translateY(0); filter: blur(0); }
}

@keyframes fadeOut {
  0%   { opacity: 1; transform: scale(1) translateY(0); filter: blur(0); }
  100% { opacity: 0; transform: scale(0.96) translateY(-12px); filter: blur(6px); }
}

.item {
  opacity: 0;
  transform: translateY(18px) scale(0.97);
  transition: all 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}
.item.visible { opacity: 1; transform: translateY(0) scale(1); }

.item-delay-1 { transition-delay: 0.05s; }
.item-delay-2 { transition-delay: 0.12s; }
.item-delay-3 { transition-delay: 0.19s; }
.item-delay-4 { transition-delay: 0.26s; }

.back-top {
  position: absolute; top: 16px; left: 16px;
  color: #6a6a6a; font-size: 20px; cursor: pointer;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  background: none; border: none; padding: 6px 10px;
  z-index: 5; display: flex; align-items: center; gap: 8px;
}
.back-top:hover { color: #e0e0e0; transform: translateX(-5px) scale(1.05); }
.back-top i { font-size: 20px; transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1); }
.back-top:hover i { transform: rotate(-12deg) scale(1.08); }

.brand { text-align: center; margin-bottom: 18px; padding-top: 2px; }
.brand h1 {
  font-weight: 600; font-size: 21px; letter-spacing: -0.2px; color: #f0f0f0;
  background: linear-gradient(135deg, #f5f5f5, #b8b8b8);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; background-size: 200% auto;
  animation: shimmer 6s ease-in-out infinite;
}
@keyframes shimmer {
  0%, 100% { background-position: 0% center; }
  50% { background-position: 100% center; }
}

.field { position: relative; }
.field input[type="email"], .field input[type="text"] {
  width: 100%; padding: 15px 16px 15px 44px;
  background: #161616; border: 2px solid #262626; border-radius: 16px;
  font-size: 15px; color: #f0f0f0; outline: none;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1); font-weight: 450;
  box-shadow: inset 0 4px 10px rgba(0,0,0,0.3);
}
.field input:focus {
  border-color: #ffffff; background: #1a1a1a;
  box-shadow: 0 0 0 4px rgba(255,255,255,0.03), inset 0 4px 10px rgba(0,0,0,0.4);
  transform: scale(1.006);
}
.field input::placeholder { color: #484848; font-weight: 400; transition: opacity 0.4s ease; }
.field input:focus::placeholder { opacity: 0.5; }
.field .icon {
  position: absolute; left: 16px; top: 50%; transform: translateY(-50%);
  color: #4a4a4a; font-size: 15px;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none; width: 16px; text-align: center;
}
.field input:focus ~ .icon { color: #ffffff; transform: translateY(-50%) scale(1.1); }

.code-grid { display: flex; gap: 8px; justify-content: center; }
.code-slot {
  width: 48px; height: 58px; background: #161616;
  border: 2px solid #262626; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 600; color: #f0f0f0;
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: inset 0 4px 10px rgba(0,0,0,0.3);
  caret-color: transparent; outline: none; text-align: center;
}
.code-slot:focus {
  border-color: #ffffff; background: #1a1a1a;
  box-shadow: 0 0 0 4px rgba(255,255,255,0.03), inset 0 4px 10px rgba(0,0,0,0.4);
  transform: scale(1.04) translateY(-2px);
}
.code-slot.correct {
  border-color: #5ae05a; background: #1a2a1a;
  box-shadow: 0 0 30px rgba(90, 224, 90, 0.12);
  animation: popCorrect 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
.code-slot.wrong {
  border-color: #ff6b6b; background: #2a1a1a;
  box-shadow: 0 0 30px rgba(255, 107, 107, 0.12);
  animation: shake 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
@keyframes popCorrect {
  0%   { transform: scale(0.8); opacity: 0.7; }
  45%  { transform: scale(1.12) rotate(-2deg); opacity: 1; }
  75%  { transform: scale(0.96) rotate(1deg); }
  100% { transform: scale(1) rotate(0); opacity: 1; }
}
@keyframes shake {
  0%   { transform: translateX(0) rotate(0); }
  15%  { transform: translateX(-8px) rotate(-2.5deg); }
  30%  { transform: translateX(8px) rotate(2.5deg); }
  45%  { transform: translateX(-5px) rotate(-1.5deg); }
  60%  { transform: translateX(5px) rotate(1.5deg); }
  80%  { transform: translateX(-2px) rotate(-0.5deg); }
  100% { transform: translateX(0) rotate(0); }
}

.hidden-input {
  position: absolute; opacity: 0; width: 1px; height: 1px; pointer-events: none;
}

.actions { margin-top: 1px; display: flex; flex-direction: column; gap: 4px; }

.btn {
  background: #ffffff; border: none; padding: 15px 18px; border-radius: 16px;
  font-weight: 600; font-size: 15px; color: #0b0b0b;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  cursor: pointer; transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 20px rgba(255,255,255,0.02);
  letter-spacing: 0.2px; width: 100%; position: relative; overflow: hidden;
}
.btn::after {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 30% 40%, rgba(255,255,255,0.15), transparent 70%);
  opacity: 0; transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.btn:hover::after { opacity: 1; }
.btn:hover {
  background: #f2f2f2; transform: scale(0.98) translateY(-1px);
  box-shadow: 0 8px 30px rgba(255,255,255,0.05);
}
.btn:active { transform: scale(0.93) translateY(0); }
.btn i { font-size: 15px; transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1); }
.btn:hover i { transform: translateX(4px) scale(1.08); }
.btn.loading { pointer-events: none; opacity: 0.8; }
.btn.loading .btn-text { opacity: 0; transform: scale(0.8); }
.btn.loading .btn-icon { opacity: 0; transform: scale(0.5) rotate(90deg); }
.btn .spinner {
  position: absolute; width: 22px; height: 22px;
  border: 3px solid rgba(11, 11, 11, 0.08); border-top-color: #0b0b0b;
  border-radius: 50%; opacity: 0; transform: scale(0.5);
  transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}
.btn.loading .spinner { opacity: 1; transform: scale(1); animation: spin 0.8s cubic-bezier(0.16, 1, 0.3, 1) infinite; }
@keyframes spin { 0% { transform: rotate(0deg) scale(1); } 100% { transform: rotate(360deg) scale(1); } }

.btn .btn-text, .btn .btn-icon { transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1); }

.status {
  margin-top: 10px; font-size: 13px; font-weight: 450;
  min-height: 18px; padding: 0 4px; letter-spacing: 0.1px;
  text-align: center; transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}
.status.error   { color: #ff7a7a; animation: statusShake 0.5s cubic-bezier(0.16, 1, 0.3, 1); }
.status.success { color: #7ae07a; animation: statusPop 0.5s cubic-bezier(0.16, 1, 0.3, 1); }
.status.info    { color: #5a5a5a; }
@keyframes statusShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}
@keyframes statusPop {
  0%   { transform: scale(0.85) translateY(4px); opacity: 0.4; }
  50%  { transform: scale(1.06) translateY(-2px); opacity: 1; }
  100% { transform: scale(1) translateY(0); opacity: 1; }
}

.nav-bottom { display: flex; justify-content: center; margin-top: 10px; padding: 0 4px; }
.nav-link {
  color: #4a4a4a; font-size: 13px; font-weight: 450; cursor: pointer;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  background: none; border: none; padding: 4px 8px;
  letter-spacing: 0.1px; display: flex; align-items: center; gap: 6px; position: relative;
}
.nav-link::after {
  content: ''; position: absolute; bottom: 0; left: 50%;
  width: 0; height: 1px; background: #7a7a7a;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1); transform: translateX(-50%);
}
.nav-link:hover:not(:disabled) { color: #c0c0c0; transform: translateY(-1px); }
.nav-link:hover:not(:disabled)::after { width: 50%; }
.nav-link:disabled { opacity: 0.4; cursor: default; }
.nav-link:disabled::after { display: none; }
.nav-link i { font-size: 13px; transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1); }
.nav-link:hover:not(:disabled) i { transform: rotate(180deg); }

.timer-text-inline {
  color: #5a5a5a; font-size: 13px; font-weight: 450;
  font-variant-numeric: tabular-nums; min-width: 32px;
  text-align: center; transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.timer-text-inline.ready { color: #4a4a4a; }

@media (max-width: 480px) {
  body { padding: 12px; }
  .page { padding: 18px 14px 14px; border-radius: 16px; }
  .code-slot { width: 40px; height: 50px; font-size: 20px; border-radius: 14px; }
  .code-grid { gap: 6px; }
  .brand h1 { font-size: 19px; }
  .brand { margin-bottom: 14px; }
  .back-top { top: 10px; left: 10px; font-size: 18px; }
  .back-top i { font-size: 18px; }
  .btn { padding: 13px 16px; font-size: 14px; border-radius: 14px; }
  .field input[type="email"] { padding: 13px 14px 13px 40px; font-size: 14px; border-radius: 14px; }
  .field .icon { left: 14px; font-size: 14px; }
  .status { font-size: 12px; min-height: 16px; margin-top: 8px; }
  .nav-link { font-size: 12px; }
  .timer-text-inline { font-size: 12px; min-width: 28px; }
  .nav-bottom { margin-top: 8px; }
  .container { min-height: 270px; }
}

@media (max-width: 380px) {
  .page { padding: 14px 10px 12px; border-radius: 14px; }
  .code-slot { width: 34px; height: 44px; font-size: 17px; border-radius: 12px; }
  .code-grid { gap: 5px; }
  .brand h1 { font-size: 17px; }
  .brand { margin-bottom: 10px; }
  .back-top { top: 8px; left: 8px; font-size: 16px; }
  .back-top i { font-size: 16px; }
  .btn { padding: 11px 14px; font-size: 13px; border-radius: 12px; gap: 8px; }
  .field input[type="email"] { padding: 11px 12px 11px 36px; font-size: 13px; border-radius: 12px; }
  .field .icon { left: 12px; font-size: 13px; }
  .btn .spinner { width: 18px; height: 18px; border-width: 2.5px; }
  .status { font-size: 11px; min-height: 14px; margin-top: 6px; }
  .nav-link { font-size: 11px; padding: 2px 6px; }
  .timer-text-inline { font-size: 11px; min-width: 24px; }
  .nav-bottom { margin-top: 6px; }
  .container { min-height: 240px; }
  .actions { gap: 3px; }
}

@media (max-width: 350px) {
  .code-slot { width: 30px; height: 40px; font-size: 15px; }
  .code-grid { gap: 4px; }
  .page { padding: 12px 8px 10px; }
  .btn { padding: 10px 12px; font-size: 12px; }
}