/* ========================================
   Бетон-Трейд Landing Page
   Design System: style-guide.md
   ======================================== */

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-primary: #3B69B5;
  --color-primary-dark: #2C5190;
  --color-primary-light: #E8EFF8;
  --color-accent: #F57C00;
  --color-accent-dark: #E65100;
  --color-accent-light: #FFF3E0;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F5F7FA;
  --color-bg-dark: #1A1A2E;
  --color-text: #1A1A2E;
  --color-text-secondary: #5A6270;
  --color-text-light: #FFFFFF;
  --color-border: #DDE1E6;
  --color-success: #2E7D32;
  --color-error: #D32F2F;
  --color-hero-overlay: rgba(26, 26, 46, 0.6);
  --font-family: 'Montserrat', 'Montserrat Fallback', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --text-h1: clamp(1.75rem, 4vw, 2.75rem);
  --text-h2: clamp(1.5rem, 3vw, 2.25rem);
  --text-h3: clamp(1.125rem, 2.5vw, 1.5rem);
  --text-body: clamp(1rem, 1.5vw, 1.125rem);
  --text-small: 0.875rem;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem;
  --space-4: 1rem; --space-5: 1.25rem; --space-6: 1.5rem;
  --space-8: 2rem; --space-10: 2.5rem; --space-12: 3rem;
  --space-16: 4rem; --space-20: 5rem;
}

@font-face {
  font-family: 'Montserrat Fallback';
  src: local('Arial');
  size-adjust: 113.2%;
  ascent-override: 84%;
  descent-override: 22%;
  line-gap-override: 0%;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font-family);
  font-size: var(--text-body);
  color: var(--color-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container { padding: 0 var(--space-8); }
}

/* --- Buttons --- */
.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  background: var(--color-accent);
  color: var(--color-text-light);
  font-family: var(--font-family);
  font-weight: 600;
  font-size: var(--text-body);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  min-height: 48px;
  text-decoration: none;
}
.btn-cta:hover { background: var(--color-accent-dark); }
.btn-cta:active { transform: scale(0.98); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background: transparent;
  color: var(--color-primary);
  font-family: var(--font-family);
  font-weight: 600;
  font-size: var(--text-body);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
  min-height: 48px;
  text-decoration: none;
}
.btn-secondary:hover { background: var(--color-primary); color: var(--color-text-light); }

.btn-cta--dark {
  background: var(--color-accent);
}

/* --- Header --- */
.header {
  position: absolute;
  top: 0; left: 0; right: 0;
  z-index: 10;
  padding: var(--space-4) 0;
}
.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.header__logo {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.header__phone-wrap {
  text-align: right;
}
.header__phone {
  color: var(--color-text-light);
  font-weight: 700;
  font-size: 1.125rem;
  text-decoration: none;
  display: block;
}
.header__phone-sub {
  color: rgba(255,255,255,0.7);
  font-size: var(--text-small);
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  background: var(--color-bg-dark);
  overflow: hidden;
  padding: var(--space-20) 0 var(--space-16);
}
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}
.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--color-hero-overlay);
}
.hero .container { position: relative; z-index: 1; }
.hero__content { max-width: 700px; }
.hero h1 {
  font-size: var(--text-h1);
  font-weight: 800;
  color: var(--color-text-light);
  line-height: 1.2;
  margin-bottom: var(--space-4);
}
.hero__subtitle {
  font-size: var(--text-h3);
  color: rgba(255,255,255,0.9);
  line-height: 1.5;
  margin-bottom: var(--space-8);
  font-weight: 400;
}
.hero__markers {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}
.hero__marker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(4px);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  color: var(--color-text-light);
  font-size: var(--text-small);
  font-weight: 500;
}
.hero__proof {
  margin-top: var(--space-4);
  color: rgba(255,255,255,0.9);
  font-size: var(--text-body);
  font-weight: 500;
}
.hero__logos {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-6);
  margin-top: var(--space-3);
}
.hero__logos img {
  height: 24px;
  width: auto;
  filter: brightness(0) invert(1);
  opacity: 0.7;
}
.hero__logos span {
  font-weight: 700;
  font-size: var(--text-small);
  color: rgba(255,255,255,0.7);
}
.hero__urgency {
  display: inline-block;
  margin-top: var(--space-4);
  padding: var(--space-2) var(--space-4);
  background: var(--color-accent-light);
  color: var(--color-accent-dark);
  font-weight: 600;
  font-size: var(--text-small);
  border-radius: var(--radius-sm);
}

/* --- Section base --- */
.section { padding: var(--space-16) 0; }
.section--alt { background: var(--color-bg-alt); }
.section--dark { background: var(--color-bg-dark); color: var(--color-text-light); }
.section__title {
  font-size: var(--text-h2);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-3);
}
.section__subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--text-body);
  margin-bottom: var(--space-12);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.section--dark .section__subtitle { color: rgba(255,255,255,0.7); }

/* --- Trust Cards (Антистрахи) --- */
.trust-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
@media (min-width: 768px) {
  .trust-grid { grid-template-columns: repeat(3, 1fr); }
}
.trust-card {
  text-align: center;
  padding: var(--space-8) var(--space-6);
}
.trust-card__icon {
  width: 48px; height: 48px;
  margin: 0 auto var(--space-4);
  color: var(--color-primary);
}
.trust-card__title {
  font-weight: 700;
  font-size: var(--text-h3);
  margin-bottom: var(--space-2);
}
.trust-card__text {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* --- Product Cards --- */
.products-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
@media (min-width: 768px) {
  .products-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1200px) {
  .products-grid { grid-template-columns: repeat(4, 1fr); }
}
.product-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s;
}
.product-card:hover { box-shadow: var(--shadow-md); }
.product-card__title {
  font-weight: 700;
  font-size: var(--text-h3);
  margin-bottom: var(--space-2);
}
.product-card__desc {
  color: var(--color-text-secondary);
  font-size: var(--text-body);
  margin-bottom: var(--space-4);
  flex-grow: 1;
}
.product-card__price {
  font-weight: 700;
  font-size: var(--text-h3);
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}
.product-card__price span {
  font-weight: 400;
  font-size: var(--text-small);
  color: var(--color-text-secondary);
}

/* --- Quiz --- */
.quiz {
  max-width: 640px;
  margin: 0 auto;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-lg);
}
.quiz__progress {
  height: 4px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
  overflow: hidden;
}
.quiz__progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}
.quiz__step { display: none; }
.quiz__step.active { display: block; }
.quiz__label {
  font-weight: 600;
  margin-bottom: var(--space-4);
  font-size: var(--text-body);
}
.quiz__options {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}
@media (min-width: 480px) {
  .quiz__options--cols2 { grid-template-columns: repeat(2, 1fr); }
}
.quiz-option {
  display: flex;
  align-items: center;
  padding: var(--space-4) var(--space-5);
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  min-height: 48px;
  font-size: var(--text-body);
  font-weight: 500;
  font-family: var(--font-family);
  text-align: left;
  width: 100%;
}
.quiz-option:hover { border-color: var(--color-primary); }
.quiz-option.selected {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}
.quiz__nav {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

/* --- Forms --- */
.form-group {
  margin-bottom: var(--space-4);
}
.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--space-2);
  font-size: var(--text-small);
}
.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: 1rem; /* 16px — no zoom iOS */
  transition: border-color 0.2s;
  min-height: 48px;
  background: var(--color-bg);
}
.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.form-input.error { border-color: var(--color-error); }
.form-error {
  color: var(--color-error);
  font-size: var(--text-small);
  margin-top: var(--space-1);
  display: none;
}
.form-input.error + .form-error { display: block; }
.form-microcopy {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--text-small);
  margin-top: var(--space-3);
}
.form-trust {
  text-align: center;
  color: var(--color-success);
  font-size: var(--text-small);
  margin-top: var(--space-4);
  font-weight: 500;
}
.form-submit-error {
  display: none;
  text-align: center;
  color: var(--color-error);
  font-size: var(--text-small);
  margin-top: var(--space-3);
  padding: var(--space-3);
  background: #FDECEA;
  border-radius: var(--radius-sm);
}

/* --- Delivery --- */
.delivery-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}
@media (min-width: 768px) {
  .delivery-grid { grid-template-columns: 1fr 1fr; align-items: start; }
}
.delivery__map {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.delivery__info {}
.delivery__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  font-size: var(--text-body);
}
.delivery__icon {
  flex-shrink: 0;
  font-size: 1.25rem;
}

/* --- Steps (Как заказать) --- */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-12);
}
@media (min-width: 768px) {
  .steps { grid-template-columns: repeat(3, 1fr); }
}
.step {
  text-align: center;
  padding: var(--space-6);
}
.step__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px; height: 48px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 700;
  font-size: 1.25rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}
.step__title {
  font-weight: 700;
  font-size: var(--text-h3);
  margin-bottom: var(--space-2);
}
.step__text {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* --- Accordion (FAQ) --- */
.accordion {}
.accordion-item { border-bottom: 1px solid var(--color-border); }
.accordion-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) 0;
  background: none;
  border: none;
  font-family: var(--font-family);
  font-weight: 600;
  font-size: var(--text-body);
  text-align: left;
  cursor: pointer;
  min-height: 48px;
  color: var(--color-text);
}
.accordion-trigger::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 300;
  transition: transform 0.3s;
  flex-shrink: 0;
  margin-left: var(--space-4);
}
.accordion-item.open .accordion-trigger::after {
  transform: rotate(45deg);
}
.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  color: var(--color-text-secondary);
  line-height: 1.7;
}
.accordion-item.open .accordion-content {
  max-height: 500px;
  padding-bottom: var(--space-4);
}

/* --- Clients / Logos --- */
.clients {
  text-align: center;
  padding: var(--space-8) 0;
}
.clients__logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-8);
  align-items: center;
  opacity: 0.6;
  margin-top: var(--space-4);
}
.clients__logo {
  font-weight: 700;
  font-size: var(--text-body);
  color: var(--color-text-secondary);
}
.clients__logo-img {
  height: 32px;
  width: auto;
  object-fit: contain;
  filter: brightness(0) invert(1);
  opacity: 0.5;
  transition: opacity 0.2s;
}
.clients__logo-img:hover {
  opacity: 0.8;
}

/* --- Final CTA --- */
.final-cta { padding: var(--space-16) 0; }
.final-cta .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}
@media (min-width: 768px) {
  .final-cta .container { grid-template-columns: 1fr 1fr; align-items: start; }
}
.final-cta__form {
  background: rgba(255,255,255,0.05);
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.1);
}
.final-cta__contacts {}
.final-cta__phone {
  font-size: var(--text-h2);
  font-weight: 700;
  color: var(--color-text-light);
  text-decoration: none;
  display: block;
  margin-bottom: var(--space-4);
}
.final-cta__address {
  color: rgba(255,255,255,0.7);
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

/* --- Footer --- */
.footer {
  background: var(--color-bg-dark);
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: var(--space-6) 0;
  text-align: center;
  color: rgba(255,255,255,0.5);
  font-size: var(--text-small);
}

/* --- Sticky Bar (mobile) --- */
.sticky-bar { display: none; }
@media (max-width: 767px) {
  .sticky-bar {
    display: flex;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    height: 60px;
    background: var(--color-bg-dark);
    z-index: 100;
    padding: var(--space-2);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.2);
  }
  .sticky-bar__btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent);
    color: var(--color-text-light);
    font-weight: 600;
    font-size: var(--text-body);
    font-family: var(--font-family);
    border: none;
    border-radius: var(--radius-md);
    text-decoration: none;
    min-height: 44px;
  }
  body { padding-bottom: 70px; }
}

/* --- Select --- */
.form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: 1rem;
  min-height: 48px;
  background: var(--color-bg);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%235A6270' stroke-width='2' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* --- Utility --- */
.text-center { text-align: center; }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.hidden { display: none !important; }