/* ==========================================================================
   TEK-STORE — Stylesheet
   Dark minimal theme · Premium feel · Clean UX
   ========================================================================== */

/* --- Design tokens ------------------------------------------------------- */
:root {
  --bg:           #0a0a0a;
  --surface:      #111111;
  --surface-2:    #181818;
  --surface-3:    #202020;
  --border:       #1f1f1f;
  --border-2:     #2a2a2a;
  --border-3:     #333333;
  --text:         #f0f0f0;
  --text-2:       #888888;
  --text-3:       #484848;
  --accent:       #5b8af5;
  --accent-glow:  rgba(91,138,245,0.18);
  --accent-dim:   rgba(91,138,245,0.1);
  --accent-dark:  #4a79e4;
  --success:      #22c55e;
  --success-dim:  rgba(34,197,94,0.1);
  --error:        #ef4444;
  --error-dim:    rgba(239,68,68,0.1);
  --warning:      #f59e0b;

  --radius-xs: 4px;
  --radius-sm: 7px;
  --radius:    11px;
  --radius-lg: 15px;
  --radius-xl: 20px;

  --font: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --ease: 0.16s ease;
  --ease-out: 0.22s cubic-bezier(0.16,1,0.3,1);
}

/* --- Reset --------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html  { scroll-behavior: smooth; }
body  {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}
a       { color: inherit; text-decoration: none; }
button  { cursor: pointer; font-family: inherit; border: none; background: none; }
input   { font-family: inherit; }

/* --- Layout -------------------------------------------------------------- */
.container    { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.main-content { flex: 1; padding-bottom: 96px; }

/* =========================================================================
   HEADER
   ========================================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10,10,10,0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 12px;
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Logo */
.logo { display: flex; align-items: center; gap: 0; }
.logo-tek   { font-size: 1.05rem; font-weight: 800; color: var(--text); letter-spacing: -0.02em; }
.logo-store { font-size: 1.05rem; font-weight: 400; color: var(--text-2); letter-spacing: -0.02em; }
.logo-sm    { font-size: 0.85rem; font-weight: 700; color: var(--text-3); }
.logo-sm span { color: var(--text-3); }

/* Balance pill */
.balance-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}
.balance-icon { color: var(--text-3); display: flex; }

/* Reset App button */
.btn-reset {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 11px;
  background: transparent;
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-3);
  transition: all var(--ease);
  white-space: nowrap;
}
.btn-reset:hover {
  border-color: rgba(239,68,68,0.4);
  color: var(--error);
  background: var(--error-dim);
}
.btn-reset svg { transition: transform 0.4s ease; }
.btn-reset:hover svg { transform: rotate(-180deg); }

/* Add Funds button */
.btn-funds {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 13px;
  background: var(--accent-dim);
  border: 1px solid rgba(91,138,245,0.3);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  transition: all var(--ease);
  white-space: nowrap;
}
.btn-funds:hover {
  background: var(--accent-glow);
  border-color: var(--accent);
}

/* Cart button */
.cart-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-2);
  transition: all var(--ease);
  white-space: nowrap;
}
.cart-btn:hover { border-color: var(--border-3); color: var(--text); }

.cart-badge {
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  font-size: 0.65rem;
  font-weight: 700;
  min-width: 17px;
  height: 17px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
}

/* =========================================================================
   HERO
   ========================================================================= */
.hero { padding: 76px 0 52px; }

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}

.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 3.8rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.06;
  margin-bottom: 18px;
}
.gradient-text {
  background: linear-gradient(135deg, #5b8af5 0%, #a78bfa 60%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1rem;
  color: var(--text-2);
  max-width: 460px;
  line-height: 1.7;
  margin-bottom: 28px;
}

.hero-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

.hero-promo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(91,138,245,0.07);
  border: 1px solid rgba(91,138,245,0.2);
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  font-size: 0.82rem;
  color: var(--text-2);
}
.hero-promo code {
  font-family: var(--mono);
  background: var(--accent-dim);
  color: var(--accent);
  padding: 2px 7px;
  border-radius: var(--radius-xs);
  font-size: 0.8rem;
  font-weight: 500;
}

/* Dots */
.dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}
.dot-accent  { background: var(--accent); }
.dot-orange  { background: var(--warning); }
.pulse { animation: pulse 2.2s infinite; }
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

/* =========================================================================
   STATS BAR
   ========================================================================= */
.stats-bar {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  margin-bottom: 52px;
}
.stats-inner {
  display: flex;
  align-items: center;
  gap: 0;
  height: 56px;
}
.stat-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 28px;
  flex: 1;
  justify-content: center;
}
.stat-number {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: 0.78rem;
  color: var(--text-3);
}
.stat-sep {
  width: 1px;
  height: 24px;
  background: var(--border-2);
  flex-shrink: 0;
}

/* =========================================================================
   COURSES
   ========================================================================= */
.courses-section { padding-bottom: 0; }

.section-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 20px;
}
.section-header h2 {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.course-count { font-size: 0.78rem; color: var(--text-3); }

/* Grid */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}

/* Card */
.course-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color var(--ease), box-shadow var(--ease), transform var(--ease-out);
  cursor: default;
}
.course-card:hover {
  border-color: var(--border-3);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  transform: translateY(-3px);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title {
  font-size: 0.975rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
}
.card-desc {
  font-size: 0.825rem;
  color: var(--text-2);
  line-height: 1.55;
  flex: 1;
}
.card-meta {
  display: flex;
  gap: 14px;
  font-size: 0.75rem;
  color: var(--text-3);
}
.card-meta span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 4px;
}
.card-price {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* Level badge */
.level-badge {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: var(--radius-xs);
}
.level-beginner     { background: rgba(34,197,94,0.1);   color: #4ade80; }
.level-intermediate { background: rgba(245,158,11,0.1);  color: #fbbf24; }
.level-advanced     { background: rgba(239,68,68,0.1);   color: #f87171; }

/* =========================================================================
   TAGS
   ========================================================================= */
.tag {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.tag-sm { padding: 2px 7px; font-size: 0.62rem; }

.tag-blue   { background: rgba(59,130,246,0.12); color: #60a5fa; border: 1px solid rgba(59,130,246,0.22); }
.tag-orange { background: rgba(249,115,22,0.12); color: #fb923c; border: 1px solid rgba(249,115,22,0.22); }
.tag-cyan   { background: rgba(6,182,212,0.12);  color: #22d3ee; border: 1px solid rgba(6,182,212,0.22);  }
.tag-red    { background: rgba(239,68,68,0.12);  color: #f87171; border: 1px solid rgba(239,68,68,0.22);  }
.tag-purple { background: rgba(168,85,247,0.12); color: #c084fc; border: 1px solid rgba(168,85,247,0.22); }
.tag-green  { background: rgba(34,197,94,0.12);  color: #4ade80; border: 1px solid rgba(34,197,94,0.22);  }

/* =========================================================================
   BUTTONS
   ========================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  transition: all var(--ease);
  white-space: nowrap;
}

/* Add to Cart */
.btn-add-cart {
  flex-shrink: 0;
  background: var(--surface-3);
  color: var(--text-2);
  border: 1px solid var(--border-2);
  padding: 6px 14px;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
  transition: all var(--ease);
}
.btn-add-cart:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-add-cart.in-cart {
  background: var(--accent-dim);
  border-color: rgba(91,138,245,0.4);
  color: var(--accent);
}

/* Checkout CTA bar */
.checkout-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 24px;
  background: var(--surface);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  padding: 14px 18px;
  animation: slideUp 0.25s var(--ease-out);
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.cta-left {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--text-2);
}
.cta-left svg { color: var(--text-3); }
.cta-total { font-weight: 700; color: var(--text); }
.btn-checkout {
  background: var(--accent);
  color: #fff;
  padding: 9px 20px;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  transition: background var(--ease);
}
.btn-checkout:hover { background: var(--accent-dark); }

/* Apply coupon */
.btn-apply {
  background: var(--surface-3);
  color: var(--text);
  border: 1px solid var(--border-2);
  padding: 9px 16px;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  transition: all var(--ease);
}
.btn-apply:hover { border-color: var(--border-3); }
.btn-apply:disabled { opacity: 0.45; cursor: not-allowed; }

/* Purchase */
.btn-purchase {
  width: 100%;
  background: var(--accent);
  color: #fff;
  padding: 13px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  margin-top: 4px;
  transition: background var(--ease), opacity var(--ease), transform var(--ease);
}
.btn-purchase:hover:not(:disabled) { background: var(--accent-dark); }
.btn-purchase:disabled { opacity: 0.35; cursor: not-allowed; }
.btn-purchase.shake {
  animation: shake 0.4s ease;
}
@keyframes shake {
  0%,100% { transform: translateX(0); }
  20%     { transform: translateX(-5px); }
  40%     { transform: translateX(5px); }
  60%     { transform: translateX(-4px); }
  80%     { transform: translateX(3px); }
}

/* Outline */
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-2);
  padding: 11px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--ease);
}
.btn-outline:hover { border-color: var(--border-3); }

/* =========================================================================
   CHECKOUT PAGE
   ========================================================================= */
.checkout-wrap { padding-top: 36px; }

.checkout-header { margin-bottom: 28px; }
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-3);
  margin-bottom: 10px;
  transition: color var(--ease);
}
.back-link:hover { color: var(--text-2); }
.checkout-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 4px;
}
.checkout-sub { font-size: 0.85rem; color: var(--text-3); }

.checkout-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  align-items: start;
}
@media (max-width: 720px) {
  .checkout-grid { grid-template-columns: 1fr; }
}

/* --- Cards --------------------------------------------------------------- */
.checkout-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}
.card-section-title {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 16px;
}

/* --- Order items --------------------------------------------------------- */
.order-items {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 18px;
}
.order-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.order-item-info {
  display: flex;
  align-items: center;
  gap: 11px;
  min-width: 0;
}
.order-item-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0;
  flex-shrink: 0;
}
/* Reuse tag colors as icon backgrounds */
.order-item-icon.tag-blue   { background: rgba(59,130,246,0.12); color: #60a5fa; }
.order-item-icon.tag-orange { background: rgba(249,115,22,0.12); color: #fb923c; }
.order-item-icon.tag-cyan   { background: rgba(6,182,212,0.12);  color: #22d3ee; }
.order-item-icon.tag-red    { background: rgba(239,68,68,0.12);  color: #f87171; }
.order-item-icon.tag-purple { background: rgba(168,85,247,0.12); color: #c084fc; }
.order-item-icon.tag-green  { background: rgba(34,197,94,0.12);  color: #4ade80; }

.order-item-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.order-item-name {
  font-size: 0.875rem;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.order-item-meta { font-size: 0.75rem; color: var(--text-3); }
.order-item-price { font-size: 0.875rem; font-weight: 600; color: var(--text-2); white-space: nowrap; }

.order-footer {
  display: flex;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 18px;
}
.order-footer-label { color: var(--text-2); }

/* Perks */
.perks-list {
  display: flex;
  flex-direction: column;
  gap: 7px;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}
.perk {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-3);
}
.perk svg { color: var(--success); flex-shrink: 0; }

/* --- Payment card fields ------------------------------------------------- */
.field-group { margin-bottom: 0; }
.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 20px 0;
}
.input-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-2);
  margin-bottom: 7px;
}
.required-star { color: var(--error); margin-left: 2px; }

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.input-icon {
  position: absolute;
  left: 11px;
  color: var(--text-3);
  pointer-events: none;
  flex-shrink: 0;
}
.text-input {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  padding: 10px 36px 10px 34px;
  color: var(--text);
  font-size: 0.875rem;
  outline: none;
  transition: border-color var(--ease), box-shadow var(--ease);
}
.text-input::placeholder { color: var(--text-3); }
.text-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.text-input.error   { border-color: var(--error);   box-shadow: 0 0 0 3px var(--error-dim); }
.text-input.success { border-color: rgba(34,197,94,0.5); }

.input-status {
  position: absolute;
  right: 11px;
  font-size: 0.85rem;
}
.field-hint {
  font-size: 0.76rem;
  color: var(--text-3);
  margin-top: 6px;
}
.field-msg {
  font-size: 0.82rem;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  margin-top: 8px;
}
.field-msg.success {
  background: var(--success-dim);
  border: 1px solid rgba(34,197,94,0.25);
  color: var(--success);
}
.field-msg.error {
  background: var(--error-dim);
  border: 1px solid rgba(239,68,68,0.25);
  color: var(--error);
}

/* Coupon row */
.coupon-row { display: flex; gap: 8px; }
.coupon-input {
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--mono);
  font-weight: 500;
}
.coupon-input::placeholder { text-transform: none; letter-spacing: normal; font-family: var(--font); }

/* --- Price breakdown ----------------------------------------------------- */
.price-breakdown {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}
.price-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
  color: var(--text-2);
}
.total-row {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  border-top: 1px solid var(--border);
  padding-top: 10px;
  margin-top: 4px;
}
.strikethrough { text-decoration: line-through; color: var(--text-3); }
.text-success  { color: var(--success); font-weight: 600; }

/* --- Balance status ------------------------------------------------------ */
.balance-status {
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  margin-bottom: 14px;
}
.balance-status-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  margin-bottom: 8px;
}
.balance-status-label { color: var(--text-3); }
.balance-status-value { font-weight: 600; }
.balance-status-value.ok  { color: var(--success); }
.balance-status-value.low { color: var(--error); }

.balance-bar-wrap {
  height: 3px;
  background: var(--border-2);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 8px;
}
.balance-bar {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: var(--success);
  transition: width 0.4s var(--ease-out), background 0.3s ease;
}
.balance-bar.low { background: var(--error); }

.balance-status-msg {
  font-size: 0.76rem;
  color: var(--text-3);
  line-height: 1.4;
}
.balance-status-msg.warn { color: var(--error); }
.balance-status-msg a {
  color: var(--accent);
  text-decoration: underline;
  cursor: pointer;
}

/* Secure note */
.secure-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  font-size: 0.74rem;
  color: var(--text-3);
  margin-top: 11px;
}

/* =========================================================================
   ADD FUNDS MODAL
   ========================================================================= */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(6px);
  z-index: 199;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.modal-backdrop.open { opacity: 1; pointer-events: all; }

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -46%) scale(0.97);
  z-index: 200;
  background: var(--surface);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-xl);
  width: min(480px, calc(100vw - 32px));
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s var(--ease-out);
}
.modal.open {
  opacity: 1;
  pointer-events: all;
  transform: translate(-50%, -50%) scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 22px 24px 0;
}
.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.modal-sub { font-size: 0.82rem; color: var(--text-2); margin-top: 3px; }
.modal-close {
  background: none;
  border: none;
  color: var(--text-3);
  cursor: pointer;
  padding: 2px;
  transition: color var(--ease);
  flex-shrink: 0;
}
.modal-close:hover { color: var(--text); }

.modal-body { padding: 20px 24px 24px; }

/* BTC address block */
.btc-address-block {
  display: flex;
  gap: 16px;
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 4px;
}

/* QR code placeholder */
.btc-qr {
  width: 72px;
  height: 72px;
  flex-shrink: 0;
  background: #fff;
  border-radius: var(--radius-sm);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.qr-grid {
  position: absolute;
  inset: 5px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-rows: auto 1fr auto;
  gap: 3px;
}
.qr-corner {
  width: 20px; height: 20px;
  border: 3px solid #111;
  position: relative;
}
.qr-corner::after {
  content: '';
  position: absolute;
  inset: 3px;
  background: #111;
}
.qr-corner.tr { grid-column: 3; }
.qr-corner.bl { grid-column: 1; grid-row: 3; }
.qr-dots {
  grid-column: 1 / 4;
  grid-row: 2;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    #111 2px,
    #111 4px
  ),
  repeating-linear-gradient(
    90deg,
    transparent,
    transparent 3px,
    #111 3px,
    #111 5px
  );
  opacity: 0.35;
}
.qr-label {
  position: absolute;
  bottom: 3px;
  font-size: 0.52rem;
  font-weight: 700;
  color: #111;
  letter-spacing: 0.05em;
  font-family: var(--mono);
}

/* Address info */
.btc-info { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 8px; }
.btc-addr-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.btc-addr {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  display: block;
}
.copy-btn {
  background: var(--surface-3);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-xs);
  color: var(--text-2);
  padding: 5px;
  display: flex;
  transition: all var(--ease);
  flex-shrink: 0;
}
.copy-btn:hover { border-color: var(--accent); color: var(--accent); }
.copy-btn.copied { border-color: var(--success); color: var(--success); }

.network-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.73rem;
  color: var(--text-3);
}
.addr-note {
  font-size: 0.72rem;
  color: var(--warning);
  line-height: 1.4;
}

.modal-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 18px 0;
}

/* Simulate block */
.simulate-block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--accent-dim);
  border: 1px solid rgba(91,138,245,0.2);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-bottom: 14px;
}
.simulate-text { flex: 1; }
.simulate-title {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 2px;
}
.simulate-desc { font-size: 0.78rem; color: var(--text-2); }
.btn-simulate {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  transition: background var(--ease);
  flex-shrink: 0;
}
.btn-simulate:hover { background: var(--accent-dark); }
.btn-simulate:disabled { opacity: 0.5; cursor: not-allowed; }

.modal-balance-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
}
.modal-balance-label { color: var(--text-3); }
.modal-balance-value { font-weight: 700; color: var(--text); }

/* =========================================================================
   SUCCESS OVERLAY
   ========================================================================= */
.success-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 300;
}
.success-card {
  background: var(--surface);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-xl);
  padding: 44px 36px;
  text-align: center;
  max-width: 360px;
  width: calc(100% - 40px);
  animation: popIn 0.3s var(--ease-out);
}
@keyframes popIn {
  from { opacity: 0; transform: scale(0.9); }
  to   { opacity: 1; transform: scale(1); }
}
.success-icon {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: var(--success-dim);
  border: 1px solid rgba(34,197,94,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--success);
  margin: 0 auto 20px;
}
.success-card h2 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 8px;
}
.success-card p {
  font-size: 0.875rem;
  color: var(--text-2);
  margin-bottom: 16px;
}
.success-meta {
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.8rem;
  color: var(--text-3);
  margin-bottom: 22px;
  text-align: left;
  line-height: 1.6;
}

/* =========================================================================
   TOAST
   ========================================================================= */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--surface-3);
  border: 1px solid var(--border-2);
  color: var(--text);
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.84rem;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
  z-index: 400;
  white-space: nowrap;
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}
.toast.visible { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error   { border-color: rgba(239,68,68,0.4); color: var(--error); }
.toast.success { border-color: rgba(34,197,94,0.4); color: var(--success); }

/* =========================================================================
   FOOTER
   ========================================================================= */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 18px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-3);
}
@media (max-width: 520px) {
  .footer-inner { flex-direction: column; gap: 4px; }
  .stats-bar    { display: none; }
  .nav-right    { gap: 6px; }
  .balance-pill { display: none; }
}