/* ============================================================
   ALGA Exchange — стили. Палитра вынесена в CSS-переменные.
   Стиль: плоский, плотный, утилитарный (без «нейросетевого» глянца).
   ============================================================ */
:root {
  --bg: #07090D;
  --card: #11151C;
  --card-2: #191F28;
  --gold: #F5B943;
  --gold-light: #FFD77A;
  --red: #D92735;
  --white: #FFFFFF;
  --muted: #A7AFBC;
  --border: #303743;

  --radius: 8px;
  --radius-sm: 6px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
  --t-fast: 0.12s ease;
  --t: 0.18s ease;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 110px; }

body {
  background: var(--bg);
  color: var(--white);
  font-family: var(--font);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  min-height: 100vh;
}

.container { width: min(1200px, 94%); margin-inline: auto; position: relative; }

a { color: inherit; text-decoration: none; }

.icon { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2;
  stroke-linecap: round; stroke-linejoin: round; flex: none; }
.icon.sm { width: 15px; height: 15px; }

.tnum { font-variant-numeric: tabular-nums; }

/* ---------- Кнопки ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  font-family: var(--font); font-weight: 600; font-size: 0.92rem;
  padding: 0.6rem 1.1rem; border-radius: var(--radius-sm); border: 1px solid transparent;
  cursor: pointer; transition: background var(--t), border-color var(--t), color var(--t), opacity var(--t);
  white-space: nowrap; user-select: none;
}
.btn:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }

.btn-gold { background: var(--gold); color: #1c1402; border-color: var(--gold); }
.btn-gold:hover { background: var(--gold-light); border-color: var(--gold-light); }
.btn-gold:active { background: #e8ad38; }

.btn-ghost { background: transparent; color: var(--white); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--muted); background: var(--card-2); }

.btn.full { width: 100%; }

.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.55; cursor: not-allowed; }

/* ---------- Top bar ---------- */
.topbar { background: #0A0D12; border-bottom: 1px solid var(--border); font-size: 0.8rem; color: var(--muted); }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 34px; gap: 1rem; }
.topbar-left, .topbar-right { display: flex; align-items: center; gap: 1.2rem; }
.topbar .ti { display: inline-flex; align-items: center; gap: 0.35rem; }
.topbar .ti .icon { color: var(--gold); }
.topbar a:hover { color: var(--gold-light); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: #0A0D12;
  border-bottom: 1px solid var(--border);
}
.site-header.scrolled { box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 1.2rem; height: 62px; }

.logo { display: flex; align-items: center; gap: 0.55rem; }
.logo-mark svg { display: block; }
.logo-text { font-weight: 800; font-size: 1.25rem; letter-spacing: 0.5px; line-height: 1; }
.logo-sub { display: block; font-size: 0.58rem; font-weight: 600; letter-spacing: 2.5px;
  color: var(--gold); text-transform: uppercase; margin-top: 2px; }

.main-nav { display: flex; gap: 1.4rem; }
.main-nav a { color: var(--muted); font-weight: 500; font-size: 0.92rem; padding: 0.2rem 0;
  border-bottom: 2px solid transparent; transition: color var(--t-fast), border-color var(--t-fast); }
.main-nav a:hover { color: var(--white); border-bottom-color: var(--gold); }

.header-actions { display: flex; align-items: center; gap: 0.6rem; }
.burger { display: none; background: var(--card-2); border: 1px solid var(--border); color: var(--white);
  width: 42px; height: 42px; border-radius: var(--radius-sm); align-items: center; justify-content: center; cursor: pointer; }
.burger:hover { border-color: var(--gold); }

/* Скрыто по умолчанию (и на десктопе всегда); показывается только на мобилке. */
.mobile-nav { display: none; flex-direction: column; gap: 0.2rem; padding: 0.6rem 3% 1rem; border-top: 1px solid var(--border);
  background: #0A0D12; }
.mobile-nav a:not(.btn) { padding: 0.8rem 0.5rem; border-radius: var(--radius-sm); color: var(--muted); font-weight: 500; }
.mobile-nav a:not(.btn):hover { background: var(--card-2); color: var(--white); }
.mobile-nav .btn { margin-top: 0.4rem; }

/* ---------- Hero ---------- */
.hero { padding: clamp(2rem, 5vw, 3.8rem) 0 clamp(1.6rem, 3vw, 2.6rem); border-bottom: 1px solid var(--border); }
.hero-inner { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(1.5rem, 4vw, 3rem); align-items: center; }

.hero-badge { display: inline-block; font-size: 0.78rem; font-weight: 600; color: var(--gold-light);
  background: var(--card-2); border: 1px solid var(--border); padding: 0.35rem 0.7rem; border-radius: 4px;
  margin-bottom: 1.1rem; letter-spacing: 0.2px; }

.hero-title { font-size: clamp(2.2rem, 5.5vw, 3.8rem); font-weight: 800; line-height: 1.04; letter-spacing: -0.5px; color: var(--white); }
.hero-title .accent { color: var(--gold); }
.hero-subtitle { margin-top: 0.8rem; font-size: clamp(0.98rem, 2vw, 1.15rem); color: var(--muted); font-weight: 500; }
.hero-subtitle span { color: var(--gold); margin: 0 0.25rem; }

.hero-benefits { list-style: none; margin-top: 1.6rem; display: grid; gap: 0.7rem; }
.hero-benefits li { display: flex; gap: 0.75rem; align-items: flex-start; }
.benefit-ico { width: 36px; height: 36px; flex: none; border-radius: var(--radius-sm); display: grid; place-items: center;
  background: var(--card-2); border: 1px solid var(--border); color: var(--gold); }
.hero-benefits strong { display: block; font-weight: 700; font-size: 0.96rem; }
.hero-benefits span { color: var(--muted); font-size: 0.88rem; }

.hero-cta { margin-top: 1.8rem; display: flex; gap: 0.7rem; flex-wrap: wrap; }

.hero-art { position: relative; }
.hero-svg { width: 100%; height: auto; display: block; }

/* ---------- Секции ---------- */
.section { padding: clamp(2.2rem, 5vw, 3.6rem) 0; border-bottom: 1px solid var(--border); }
.section-head { max-width: 680px; margin: 0 0 clamp(1.4rem, 3vw, 2rem); }
.section-head h2 { font-size: clamp(1.5rem, 3.5vw, 2.1rem); font-weight: 700; letter-spacing: -0.3px;
  padding-left: 0.7rem; border-left: 3px solid var(--gold); }
.section-head p { margin-top: 0.5rem; color: var(--muted); font-size: 0.98rem; padding-left: 0.9rem; }

/* ---------- Калькулятор ---------- */
.calc-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: clamp(1rem, 2.5vw, 1.6rem); box-shadow: var(--shadow); }

.calc-meta { display: flex; flex-wrap: wrap; gap: 0.9rem 2rem; padding-bottom: 1.1rem; margin-bottom: 1.2rem;
  border-bottom: 1px solid var(--border); }
.meta-item { display: flex; flex-direction: column; gap: 0.25rem; }
.meta-label { display: inline-flex; align-items: center; gap: 0.35rem; color: var(--muted); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.5px; }
.meta-label .icon { color: var(--gold); }
.meta-value { font-weight: 700; font-size: 1rem; font-variant-numeric: tabular-nums; }
.badge { align-self: flex-start; display: inline-flex; align-items: center; gap: 0.3rem; font-size: 0.8rem; font-weight: 600;
  padding: 0.22rem 0.6rem; border-radius: 4px; background: rgba(245, 185, 67, 0.1); color: var(--gold-light);
  border: 1px solid rgba(245, 185, 67, 0.35); }

.calc-panels { display: grid; grid-template-columns: 1fr auto 1fr; gap: 0.8rem; align-items: end; }
.panel { background: var(--card-2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0.85rem 1rem; }
.panel > label { display: block; color: var(--muted); font-size: 0.8rem; font-weight: 600; margin-bottom: 0.5rem; text-transform: uppercase; letter-spacing: 0.5px; }
.panel-row { display: flex; align-items: center; gap: 0.5rem; }
.amount-input { flex: 1; min-width: 0; background: transparent; border: none; color: var(--white);
  font-size: clamp(1.3rem, 3vw, 1.6rem); font-weight: 700; font-family: var(--font); font-variant-numeric: tabular-nums; }
.amount-input:focus { outline: none; }
.amount-input[readonly] { color: var(--gold-light); }

.swap-btn { width: 42px; height: 42px; border-radius: var(--radius-sm); display: grid; place-items: center; cursor: pointer;
  background: var(--gold); color: #1c1402; border: 1px solid var(--gold); transition: background var(--t); align-self: center; }
.swap-btn:hover { background: var(--gold-light); }
.swap-btn:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }
.swap-btn .icon { color: #1c1402; }

/* кастомный селект валюты */
.currency-select { position: relative; flex: none; }
.cs-button { display: flex; align-items: center; gap: 0.45rem; background: var(--card); border: 1px solid var(--border);
  color: var(--white); padding: 0.45rem 0.6rem; border-radius: var(--radius-sm); cursor: pointer; font-weight: 600;
  font-family: var(--font); transition: border-color var(--t-fast); }
.cs-button:hover { border-color: var(--gold); }
.cs-button:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }
.cs-button .cs-code { font-size: 0.92rem; }
.cs-button .chev { transition: transform var(--t); color: var(--muted); }
.currency-select.open .cs-button .chev { transform: rotate(180deg); }
.cs-flag { width: 24px; height: 16px; border-radius: 2px; overflow: hidden; flex: none; box-shadow: 0 0 0 1px rgba(255,255,255,0.1); }
.cs-flag svg { width: 100%; height: 100%; display: block; }

.cs-menu { position: absolute; top: calc(100% + 6px); right: 0; min-width: 220px; background: var(--card);
  border: 1px solid var(--border); border-radius: var(--radius-sm); box-shadow: 0 8px 24px rgba(0,0,0,0.5); padding: 0.3rem;
  z-index: 40; display: none; }
.currency-select.open .cs-menu { display: block; }
.cs-option { display: flex; align-items: center; gap: 0.55rem; width: 100%; background: transparent; border: none;
  color: var(--white); padding: 0.55rem 0.6rem; border-radius: 4px; cursor: pointer; text-align: left; font-family: var(--font); }
.cs-option:hover, .cs-option.active { background: var(--card-2); }
.cs-option .cs-name { color: var(--muted); font-size: 0.84rem; }
.cs-option.active .cs-name { color: var(--gold-light); }
.cs-option b { font-weight: 700; }

.calc-warning { display: flex; align-items: center; gap: 0.5rem; margin-top: 1.1rem; padding: 0.7rem 0.9rem;
  background: rgba(217, 39, 53, 0.07); border: 1px solid rgba(217, 39, 53, 0.3); border-radius: var(--radius-sm);
  color: #ffbfc5; font-size: 0.88rem; }
.calc-warning .icon { color: var(--red); }

.calc-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.8rem; margin-top: 1.2rem; }
.info-card { display: flex; align-items: center; gap: 0.8rem; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 0.85rem 1rem; transition: border-color var(--t); }
.info-card:hover { border-color: var(--muted); }
.info-card strong { display: block; font-size: 0.95rem; }
.info-card span { color: var(--muted); font-size: 0.86rem; font-variant-numeric: tabular-nums; }
.info-card-flag { width: 40px; height: 27px; border-radius: 3px; overflow: hidden; flex: none; box-shadow: 0 0 0 1px rgba(255,255,255,0.1); }
.info-card-flag svg { width: 100%; height: 100%; }
.info-card-ico { width: 40px; height: 40px; flex: none; border-radius: var(--radius-sm); display: grid; place-items: center;
  background: var(--card-2); color: var(--gold); border: 1px solid var(--border); }

.demo-note { margin-top: 1.1rem; color: var(--muted); font-size: 0.83rem; max-width: 760px; }

/* ---------- Форма ---------- */
.order-card { background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: clamp(1rem, 2.5vw, 1.6rem); box-shadow: var(--shadow); max-width: 820px; }

.order-summary { background: var(--card-2); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 0.9rem 1.1rem; margin-bottom: 1.4rem; }
.summary-dir { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.summary-cell { display: flex; flex-direction: column; gap: 0.2rem; }
.summary-label { color: var(--muted); font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.5px; }
.summary-value { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 1.1rem; font-variant-numeric: tabular-nums; }
.summary-value b { font-weight: 800; }
.summary-arrow { color: var(--gold); }
.mini-flag { width: 22px; height: 15px; border-radius: 2px; overflow: hidden; display: inline-block;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.1); }
.mini-flag svg { width: 100%; height: 100%; display: block; }
.summary-edit { display: inline-block; margin-top: 0.6rem; color: var(--gold-light); font-size: 0.83rem; font-weight: 600; }
.summary-edit:hover { text-decoration: underline; }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.9rem; }
.field { display: flex; flex-direction: column; gap: 0.35rem; }
.field-full { grid-column: 1 / -1; }
.field label { font-size: 0.85rem; font-weight: 600; color: var(--muted); }
.field .req { color: var(--red); }
.field .opt { color: var(--muted); font-weight: 400; font-size: 0.78rem; }
.field input, .field textarea { background: var(--card-2); border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--white); padding: 0.7rem 0.8rem; font-family: var(--font); font-size: 0.95rem; transition: border-color var(--t-fast); }
.field input::placeholder, .field textarea::placeholder { color: #626b7a; }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--gold); }
.field textarea { resize: vertical; min-height: 78px; }
.field.invalid input, .field.invalid textarea { border-color: var(--red); }
.field-error { color: #ff8a93; font-size: 0.8rem; min-height: 1em; }

.form-note { color: #ff8a93; font-size: 0.88rem; margin-top: 0.9rem; min-height: 1em; }
.btn-submit { width: 100%; margin-top: 1.2rem; font-size: 1rem; padding: 0.85rem; position: relative; }
.btn-spinner { width: 17px; height: 17px; border-radius: 50%; border: 2px solid rgba(28, 20, 2, 0.35);
  border-top-color: #1c1402; animation: spin 0.7s linear infinite; display: none; }
.btn-submit.loading .btn-spinner { display: inline-block; }
.btn-submit.loading .btn-label { opacity: 0.7; }
@keyframes spin { to { transform: rotate(360deg); } }

.form-disclaimer { margin-top: 0.9rem; color: var(--muted); font-size: 0.82rem; }

/* ---------- Партнёры ---------- */
.brand-gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.9rem; margin-bottom: 1.4rem; max-width: 640px; }
.brand-shot { position: relative; aspect-ratio: 1 / 1; border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; background: var(--card-2); }
.brand-shot img { width: 100%; height: 100%; object-fit: cover; display: block; }
.brand-shot .brand-fallback { position: absolute; inset: 0; display: none; place-items: center; text-align: center;
  font-weight: 800; font-size: 1.6rem; letter-spacing: 1px; color: var(--gold); padding: 1rem; }
.brand-shot.no-img img { display: none; }
.brand-shot.no-img .brand-fallback { display: grid; }

/* ---------- Footer ---------- */
.site-footer { padding: 2rem 0; background: #0A0D12; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; flex-wrap: wrap; }
.footer-brand p { color: var(--muted); font-size: 0.88rem; margin-top: 0.4rem; max-width: 380px; }
.footer-legal { color: var(--muted); font-size: 0.8rem; text-align: right; }

/* ---------- Модалка успеха ---------- */
.modal-overlay { position: fixed; inset: 0; z-index: 200; background: rgba(4, 6, 10, 0.8);
  display: grid; place-items: center; padding: 1.2rem; }
/* Атрибут hidden должен побеждать display:grid выше (специфичность 0,2,0). */
.modal-overlay[hidden] { display: none; }
.modal-card { background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2rem 1.8rem; text-align: center; max-width: 430px; width: 100%;
  box-shadow: 0 16px 48px rgba(0,0,0,0.6); }
.success-ico { width: 64px; height: 64px; margin: 0 auto 1rem; border-radius: 50%; display: grid; place-items: center;
  background: rgba(245, 185, 67, 0.1); border: 1px solid rgba(245, 185, 67, 0.4); color: var(--gold); }
.success-ico .icon { width: 32px; height: 32px; }
.modal-card h3 { font-size: 1.35rem; font-weight: 700; }
.success-number { margin-top: 0.7rem; font-size: 1rem; color: var(--muted); }
.success-number b { color: var(--gold-light); font-size: 1.15rem; letter-spacing: 0.5px; font-variant-numeric: tabular-nums; }
.success-text { margin-top: 0.5rem; color: var(--muted); }
.modal-card .btn { margin-top: 1.4rem; width: 100%; }

/* ---------- Утилиты ---------- */
.hide-sm { display: inline-flex; }

/* ---------- Адаптив ---------- */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-art { order: -1; max-width: 480px; margin: 0 auto; }
  .main-nav { display: none; }
  .burger { display: flex; }
  .mobile-nav:not([hidden]) { display: flex; }
}

@media (max-width: 680px) {
  .calc-panels { grid-template-columns: 1fr; }
  .swap-btn { justify-self: center; transform: rotate(90deg); }
  .calc-cards { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-legal { text-align: left; }
  .summary-arrow { transform: rotate(90deg); }
  .hide-sm { display: none; }
  .topbar-left, .topbar-right { gap: 0.8rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}