*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", "Montserrat", Arial, sans-serif;
  line-height: 1.6;
  background: #f1f5f9;
  color: #0f172a;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: linear-gradient(rgba(15, 23, 42, 0.7), rgba(15, 23, 42, 0.7)), url(../img/phone1.jpg);
  background-size: cover;
  background-position: center;
}

:root {
  --clr-primary: #e63946;
  --clr-primary-dark: #d62828;
  --clr-success: #10b981;
  --clr-error: #ef4444;
  --clr-bg-card: #ffffff;
  --clr-bg-input: #f8fafc;
  --clr-border: #cbd5e1;
  --radius: 12px;
  --shadow-card: 0 10px 25px rgba(0, 0, 0, 0.15);
  --transition: 0.3s ease-in-out;
}

.container {
  width: 100%;
  max-width: 440px;
  padding: 1.25rem;
}

.card {
  background: var(--clr-bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.logo-icon {
  font-size: 2.2rem;
}

h1 {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 0;
  color: var(--clr-primary-dark);
  letter-spacing: -0.5px;
}

h2 {
  font-size: 1.25rem;
  font-weight: 600;
  text-align: center;
  color: #475569;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.input-group label {
  font-size: 0.95rem;
  color: #155ec4;
  font-weight: 500;
}

.input-group input {
  width: 100%;
  padding: 0.7rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--clr-border);
  border-radius: 6px;
  background: var(--clr-bg-input);
  transition: var(--transition);
}

.input-group input:focus {
  outline: none;
  border-color: var(--clr-primary);
  background: #ffffff;
  box-shadow: 0 0 0 4px rgba(230, 57, 70, 0.15);
}

.password-group .password-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.toggle-password {
  position: absolute;
  right: 0.75rem;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  font-size: 1.2rem;
  color: #64748b;
  transition: var(--transition);
}

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

.password-wrapper input {
  padding-right: 2.8rem; 
}

.error-message {
  min-height: 1.3rem; 
  font-size: 0.85rem;
  color: var(--clr-error);
  font-weight: 500;
}

.btn {
  display: inline-block;
  width: 100%;
  padding: 0.85rem;
  font-size: 1.05rem;
  font-weight: 700;
  text-align: center;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  text-transform: uppercase;
}

.btn-primary {
  background: var(--clr-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--clr-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(230, 57, 70, 0.3);
}

.footer-link {
  text-align: center;
  font-size: 0.95rem;
  color: #475569;
  margin-top: 0.5rem;
}

.footer-link a {
  color: var(--clr-primary);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
}

.footer-link a:hover {
  color: var(--clr-primary-dark);
  text-decoration: underline;
}

@keyframes slideUp {
  0% { opacity: 0; transform: translateY(35px); }
  100% { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  0% { opacity: 0; }
  100% { opacity: 1; }
}

.animate-slideUp {
  animation: slideUp 0.5s var(--transition) forwards;
}

.animate-fadeIn {
  animation: fadeIn 0.5s var(--transition) forwards;
}

@media (max-width: 480px) {
  .card { padding: 2rem 1.5rem; }
  h1 { font-size: 1.4rem; }
  h2 { font-size: 1.1rem; }
  .logo-icon { font-size: 1.8rem; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --clr-bg-card: #1e293b;
    --clr-bg-input: #0f172a;
    --clr-border: #334155;
    --clr-primary: #ef4444;
    --clr-primary-dark: #dc2626;
    --clr-error: #f87171;
  }
  body {
    color: #f1f5f9;
  }
  .error-message { color: var(--clr-error); }
  .footer-link, .footer-link a { color: #cbd5e1; }
  h2 { color: #94a3b8; }
}

/* ==========================================================================
   ОПТИМИЗАЦИЯ СТРАНИЦ ВХОДА И РЕГИСТРАЦИИ ПО ТЗ (393x851px)
   ========================================================================== */

@media (max-width: 480px) {
  .container {
    padding: 10px;
  }

  .card {
    padding: 1.75rem 1.25rem; /* Оптимальные внутренние отступы для 393px */
    gap: 1.25rem;
  }

  .logo {
    margin-bottom: 0.25rem;
  }

  h1 {
    font-size: 1.35rem;
  }

  h2 {
    font-size: 1.05rem;
  }

  form {
    gap: 1rem;
  }

  .input-group input {
    padding: 0.65rem 0.85rem;
    font-size: 0.95rem;
  }

  .btn {
    padding: 0.75rem;
    font-size: 0.95rem;
  }
}