@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700&display=swap');

:root {
  --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  --bg-color: #f8f9fa;
  --card-bg: #ffffff;
  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --text-muted: #8e8d92;
  --input-placeholder: #cbd5e1;
  --input-border: #e2e8f0;
  --input-border-focus: #4b5563;
  --btn-bg: #5c5b5f;
  --btn-hover: #464548;
  --btn-text: #ffffff;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 24px;
}

.container {
  width: 100%;
  max-width: 450px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.brand {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-primary);
  text-transform: uppercase;
  margin-bottom: 36px;
  user-select: none;
}

.card {
  width: 100%;
  background-color: var(--card-bg);
  border-radius: 16px;
  padding: 48px;
  box-shadow: 
    0 4px 6px -1px rgba(0, 0, 0, 0.01),
    0 10px 40px -3px rgba(0, 0, 0, 0.03);
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: box-shadow var(--transition-normal);
}

.card:hover {
  box-shadow: 
    0 4px 6px -1px rgba(0, 0, 0, 0.02),
    0 20px 50px -3px rgba(0, 0, 0, 0.05);
}

.card-title {
  font-size: 21px;
  font-weight: 700;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.card-desc {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 36px;
  max-width: 320px;
}

.form-group {
  width: 100%;
  display: flex;
  flex-direction: column;
  margin-bottom: 36px;
}

.form-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 12px;
  align-self: flex-start;
}

.form-input {
  font-family: var(--font-family);
  font-size: 14.5px;
  color: var(--text-primary);
  border: none;
  border-bottom: 1px solid var(--input-border);
  padding: 0 0 10px 0;
  width: 100%;
  background: transparent;
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-input::placeholder {
  color: var(--input-placeholder);
}

.form-input:focus {
  border-bottom-color: var(--input-border-focus);
}

.btn-submit {
  font-family: var(--font-family);
  width: 100%;
  background-color: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  border-radius: 8px;
  padding: 14px 20px;
  margin-top: 30px;
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: 
    background-color var(--transition-fast), 
    transform 0.1s ease,
    box-shadow var(--transition-fast);
}

.btn-submit:hover {
  background-color: var(--btn-hover);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.btn-submit:active {
  transform: scale(0.985);
}

.btn-submit svg {
  transition: transform var(--transition-fast);
}

.btn-submit:hover svg {
  transform: translateX(3px);
}

.back-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 36px;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.back-link svg {
  transition: transform var(--transition-fast);
}

.back-link:hover svg {
  transform: translateX(-4px);
}

@media (max-width: 480px) {
  body {
    padding: 16px;
  }
  
  .card {
    padding: 32px 24px;
    border-radius: 12px;
  }
  
  .brand {
    margin-bottom: 28px;
  }
  
  .card-title {
    font-size: 19px;
  }
  
  .card-desc {
    font-size: 13px;
    margin-bottom: 28px;
  }
  
  .form-group {
    margin-bottom: 28px;
  }
  
  .back-link {
    margin-top: 28px;
  }
}