/* ===== СБРОС И БАЗОВЫЕ СТИЛИ ===== */

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


/* ===== ПЕРЕМЕННЫЕ ===== */

:root {
  --bg-primary: #f6f8fa;
  --bg-secondary: #f6f8fa;
  --bg-tertiary: #eef2f6;
  --bg-card: #ffffff;
  --bg-input: #ffffff;
  --bg-hover: #f3f4f6;

  --border-primary: #d0d7de;
  --border-accent: #0969da;
  --border-error: #cf222e;
  --border-success: #1a7f37;

  --text-primary: #1f2328;
  --text-secondary: #656d76;
  --text-accent: #0969da;
  --text-error: #cf222e;
  --text-success: #1a7f37;
  --text-link: #0969da;
  --text-link-hover: #0550ae;

  --accent-primary: #1f883d;
  --accent-hover: #1a7f37;
  --accent-active: #116329;

  --shadow-sm:
    0 1px 0 rgba(31, 35, 40, 0.04);

  --shadow-md:
    0 1px 3px rgba(31, 35, 40, 0.06),
    0 8px 24px rgba(140, 149, 159, 0.12);

  --shadow-lg:
    0 8px 24px rgba(140, 149, 159, 0.18);

  --shadow-glow:
    0 0 0 3px rgba(9, 105, 218, 0.18);

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --transition-fast:
    150ms cubic-bezier(0.4, 0, 0.2, 1);

  --transition-normal:
    200ms cubic-bezier(0.4, 0, 0.2, 1);

  --font-mono:
    "SF Mono",
    "Cascadia Code",
    "Fira Code",
    "JetBrains Mono",
    "Consolas",
    monospace;

  --font-sans:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "Noto Sans",
    Helvetica,
    Arial,
    sans-serif;
}


/* ===== HTML ===== */

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}


/* ===== BODY ===== */

body {
  min-height: 100vh;

  display: flex;
  flex-direction: column;

  font-family: var(--font-sans);
  line-height: 1.6;

  color: var(--text-primary);

  background:
    radial-gradient(
      circle at top,
      rgba(9, 105, 218, 0.055),
      transparent 420px
    ),
    var(--bg-primary);
}


/* ===== ОСНОВНОЙ КОНТЕЙНЕР (main) ===== */

main {
  flex: 1;

  display: flex;
  flex-direction: column;

  width: 100%;
  max-width: 520px;

  margin: 0 auto;
  padding: 2rem 1rem;
}


/* ===== ШАПКА ===== */

.hero {
  margin-bottom: 2rem;
  padding: 2rem 0 1.5rem;

  text-align: center;

  border-bottom: 1px solid var(--border-primary);
}

.hero__title {
  margin-bottom: 0.5rem;

  font-size: 2rem;
  font-weight: 700;

  letter-spacing: -0.5px;

  color: var(--text-primary);
}

.hero__subtitle {
  font-size: 0.95rem;
  line-height: 1.5;

  color: var(--text-secondary);
}


/* ===== КАРТОЧКА ===== */

.card {
  padding: 2rem;

  background-color: var(--bg-card);

  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);

  box-shadow: var(--shadow-md);
}

.card__title {
  margin-bottom: 0.5rem;

  font-size: 1.5rem;
  font-weight: 600;

  color: var(--text-primary);
}

.card__subtitle {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;

  font-size: 0.9rem;

  color: var(--text-secondary);

  border-bottom: 1px solid var(--border-primary);
}


/* ===== ССЫЛКИ ===== */

a {
  color: var(--text-link);
  text-decoration: none;

  transition:
    color var(--transition-fast);
}

a:hover {
  color: var(--text-link-hover);
  text-decoration: underline;
}


/* ===== ФОРМА ===== */

form {
  display: flex;
  flex-direction: column;

  gap: 1.25rem;
}


/* ===== ПОЛЯ ===== */

.field {
  display: flex;
  flex-direction: column;

  gap: 0.5rem;
}

.label {
  font-size: 0.875rem;
  font-weight: 600;

  letter-spacing: 0.01em;

  color: var(--text-primary);
}

.input[type="text"],
.input[type="password"] {
  width: 100%;

  padding: 0.625rem 0.875rem;

  font-family: var(--font-sans);
  font-size: 0.9375rem;

  color: var(--text-primary);

  background-color: var(--bg-input);

  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);

  box-shadow:
    inset 0 1px 0 rgba(31, 35, 40, 0.02);

  outline: none;

  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

.input:hover {
  border-color: #afb8c1;
}

.input:focus {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-glow);
}

.input[aria-invalid="true"] {
  border-color: var(--border-error);
}

.input[aria-invalid="true"]:focus {
  box-shadow:
    0 0 0 3px rgba(207, 34, 46, 0.15);
}


/* ===== КНОПКА ===== */

.btn {
  width: 100%;

  padding: 0.75rem 1.5rem;

  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;

  letter-spacing: 0.01em;

  color: #ffffff;

  background-color: var(--accent-primary);

  border: 1px solid rgba(31, 35, 40, 0.15);
  border-radius: var(--radius-sm);

  box-shadow:
    0 1px 0 rgba(31, 35, 40, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.12);

  cursor: pointer;

  transition:
    background-color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast),
    opacity var(--transition-fast);
}

.btn:hover {
  background-color: var(--accent-hover);

  box-shadow:
    0 2px 5px rgba(31, 35, 40, 0.12);
}

.btn:active {
  background-color: var(--accent-active);

  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.5;

  cursor: not-allowed;

  transform: none;
}

.btn:focus-visible {
  outline: none;

  box-shadow:
    0 0 0 3px rgba(31, 136, 61, 0.2);
}


/* ===== СТАТУС СООБЩЕНИЕ (для входа) ===== */

#login-status {
  min-height: 1.5em;

  padding: 0.5rem;

  font-size: 0.875rem;
  font-weight: 500;

  text-align: center;

  border-radius: var(--radius-sm);

  transition:
    all var(--transition-fast);
}

#login-status:empty {
  display: none;
}

#login-status:not(:empty) {
  background-color: var(--bg-tertiary);

  border: 1px solid var(--border-primary);
}


/* ===== COOKIE / ПОЛИТИКА ===== */

.cookie {
  margin-top: 1.5rem;
  padding-top: 1.5rem;

  font-size: 0.8rem;
  text-align: center;

  color: var(--text-secondary);

  border-top: 1px solid var(--border-primary);
}


/* ===== ЗАГРУЗКА (СОСТОЯНИЕ ФОРМЫ) ===== */

form[aria-busy="true"] {
  opacity: 0.7;

  pointer-events: none;
}

form[aria-busy="true"] .btn {
  position: relative;

  color: transparent;
}

form[aria-busy="true"] .btn::after {
  content: "";

  position: absolute;

  top: 50%;
  left: 50%;

  width: 1.25rem;
  height: 1.25rem;

  margin:
    -0.625rem
    0
    0
    -0.625rem;

  border:
    2px solid rgba(255, 255, 255, 0.4);

  border-top-color: #ffffff;

  border-radius: 50%;

  animation:
    spin 0.6s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}


/* ===== ФОКУС ===== */

:focus-visible {
  outline:
    2px solid var(--border-accent);

  outline-offset: 2px;
}


/* ===== ВЫДЕЛЕНИЕ ТЕКСТА ===== */

::selection {
  color: var(--text-primary);

  background-color:
    rgba(9, 105, 218, 0.18);
}


/* ===== АВТОЗАПОЛНЕНИЕ ===== */

input:-webkit-autofill,
input:-webkit-autofill:hover,
input:-webkit-autofill:focus {
  -webkit-text-fill-color:
    var(--text-primary);

  -webkit-box-shadow:
    0 0 0 1000px
    var(--bg-input)
    inset;

  transition:
    background-color 5000s ease-in-out 0s;
}


/* ===== АДАПТИВНОСТЬ ===== */

@media (max-width: 600px) {
  main {
    padding: 1rem 0.75rem;
  }

  .hero {
    margin-bottom: 1.5rem;
    padding-top: 1.25rem;
  }

  .hero__title {
    font-size: 1.5rem;
  }

  .card {
    padding: 1.5rem;
  }
}


/* ===== УМЕНЬШЕНИЕ АНИМАЦИЙ ===== */

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}