/* ============================================================
   Advisor AI — общие стили
   ============================================================ */

:root {
  /* Бренд (WebMoney-синий) */
  --color-primary:        #1976D2;
  --color-primary-hover:  #1565C0;
  --color-primary-active: #0D47A1;
  --color-primary-soft:   #E3F2FD;

  /* Поверхности */
  --color-bg:       #FFFFFF;
  --color-bg-alt:   #F5F7FA;
  --color-surface:  #FFFFFF;

  /* Текст */
  --color-text:        #212121;
  --color-text-muted:  #5F6B7A;
  --color-text-invert: #FFFFFF;

  /* Границы */
  --color-border: #E0E4E8;

  /* Декор */
  --color-grid-line: rgba(25, 118, 210, 0.10);

  /* Статусы */
  --color-success:      #2E7D32;
  --color-success-soft: #E8F5E9;
  --color-error:        #D32F2F;
  --color-error-soft:   #FDECEA;

  /* Типографика */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --fs-hero:   2.5rem;
  --fs-h2:     1.875rem;
  --fs-lead:   1.125rem;
  --fs-body:   1rem;
  --fs-small:  0.875rem;
  --lh-tight:  1.25;
  --lh-base:   1.6;

  /* Layout */
  --container-max: 1140px;
  --radius:        8px;
  --shadow-card:   0 1px 3px rgba(0, 0, 0, 0.08);
  --transition:    0.18s ease;

  /* Шкала отступов */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
}

/* ---------- Reset / base ---------- */

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-base);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
p {
  margin: 0;
}

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

a:hover {
  color: var(--color-primary-hover);
}

img,
svg {
  display: block;
  max-width: 100%;
}

input {
  font-family: inherit;
}

/* ---------- Layout ---------- */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.section {
  padding: var(--space-5) 0;
}

.section--alt {
  background: var(--color-bg-alt);
}

.section__title {
  font-size: var(--fs-h2);
  line-height: var(--lh-tight);
  text-align: center;
  margin-bottom: var(--space-2);
}

.section__subtitle {
  font-size: var(--fs-lead);
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: var(--space-4);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: var(--fs-body);
  font-weight: 600;
  line-height: 1;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition),
    color var(--transition);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-invert);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  color: var(--color-text-invert);
}

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

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--outline:hover {
  background: var(--color-bg-alt);
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

.btn--lg {
  padding: 14px 32px;
  font-size: var(--fs-lead);
}

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 1.375rem;
  font-weight: 700;
  white-space: nowrap;
  color: var(--color-primary);
}

.logo:hover {
  color: var(--color-primary);
}

.logo__avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: var(--space-5) 0;
}

/* Анимированная сетка — декоративный фон hero */
.hero__grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--color-grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--color-grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(ellipse 75% 70% at 72% 38%, #000 30%, transparent 100%);
  mask-image: radial-gradient(ellipse 75% 70% at 72% 38%, #000 30%, transparent 100%);
  animation: hero-grid-drift 26s linear infinite;
}

@keyframes hero-grid-drift {
  to {
    background-position: 44px 44px, 44px 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero__grid {
    animation: none;
  }
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  align-items: center;
}

.hero__title {
  font-size: var(--fs-hero);
  line-height: var(--lh-tight);
  margin-bottom: var(--space-3);
}

.hero__subtitle {
  font-size: var(--fs-lead);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.hero__art {
  width: 100%;
  height: auto;
}

/* ---------- Features ---------- */

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
  text-align: center;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.feature-card:hover {
  box-shadow: var(--shadow-card);
  border-color: var(--color-primary);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-2);
  color: var(--color-primary);
}

.feature-card__title {
  font-size: var(--fs-body);
  font-weight: 600;
}

.feature-card__example {
  margin-top: var(--space-1);
  font-size: var(--fs-small);
  font-style: italic;
  color: var(--color-text-muted);
}

/* ---------- Pricing ---------- */

.pricing__packages {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.package-card {
  position: relative;
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4) var(--space-3);
  text-align: center;
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

.package-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: 0 8px 20px rgba(25, 118, 210, 0.15);
}

.package-card:hover .package-card__days {
  color: var(--color-primary);
}

.package-card--featured {
  border-color: var(--color-primary);
  border-width: 2px;
}

.package-card__badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: var(--color-text-invert);
  font-size: var(--fs-small);
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
  white-space: nowrap;
}

.package-card__amount {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

.package-card__days {
  margin-top: var(--space-1);
  color: var(--color-text-muted);
}

.pricing__max {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
}

/* ---------- Calculator ---------- */

.calculator {
  max-width: 420px;
  margin: 0 auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
  text-align: center;
}

.calculator__heading {
  font-size: 1.25rem;
  margin-bottom: var(--space-3);
}

.calculator__label {
  display: block;
  font-size: var(--fs-small);
  color: var(--color-text-muted);
  text-align: left;
  margin-bottom: var(--space-1);
}

.calculator__input {
  width: 100%;
  padding: 12px var(--space-2);
  font-size: var(--fs-lead);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition);
}

.calculator__input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.calculator__result {
  margin: var(--space-3) 0;
  font-size: var(--fs-lead);
}

.calculator__result strong {
  font-size: 1.75rem;
  color: var(--color-primary);
}

.calculator .btn {
  width: 100%;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
  padding: var(--space-3) 0;
}

.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--fs-small);
  color: var(--color-text-muted);
}

/* ---------- Status pages (success / fail) ---------- */

.status-page {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.status-page__main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5) var(--space-3);
}

.status-card {
  max-width: 560px;
  text-align: center;
}

.status-card__icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-3);
}

.status-card__icon--success {
  color: var(--color-success);
}

.status-card__icon--error {
  color: var(--color-error);
}

.status-card__title {
  font-size: var(--fs-h2);
  line-height: var(--lh-tight);
  margin-bottom: var(--space-2);
}

.status-card__text {
  font-size: var(--fs-lead);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.status-card__actions {
  display: flex;
  gap: var(--space-2);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================
   Адаптив
   ============================================================ */

@media (max-width: 768px) {
  :root {
    --fs-hero: 2rem;
    --fs-h2: 1.5rem;
  }

  .section {
    padding: var(--space-4) 0;
  }

  .hero {
    padding: var(--space-4) 0;
  }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .hero__art {
    order: -1;
    max-width: 360px;
    margin: 0 auto;
  }

  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing__packages {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  :root {
    --fs-hero: 1.75rem;
  }

  .container {
    padding: 0 var(--space-2);
  }

  .site-header__inner {
    height: 60px;
  }

  .logo {
    font-size: 1.25rem;
  }

  .logo__avatar {
    width: 30px;
    height: 30px;
  }

  .site-header .btn {
    padding: 9px 14px;
    font-size: var(--fs-small);
  }

  .hero__art {
    display: none;
  }

  .features__grid {
    grid-template-columns: 1fr;
  }

  .pricing__packages {
    grid-template-columns: 1fr;
  }

  .calculator {
    padding: var(--space-3);
  }

  .status-card__actions {
    flex-direction: column;
  }

  .status-card__actions .btn {
    width: 100%;
  }

  .site-footer__inner {
    flex-direction: column;
    gap: var(--space-1);
    text-align: center;
  }
}