/* ============================================
   THEME VARIABLES
============================================ */
:root {
  --bg:        #f7f8fa;
  --surface:   #ffffff;
  --surface-2: #f0f2f5;
  --border:    #e3e6ea;
  --text:      #1a1d21;
  --text-mute: #6b7280;
  --text-dim:  #9ca3af;
  --accent:    #2563eb;
  --accent-2:  #1d4ed8;
  --success:   #059669;
  --danger:    #dc2626;
  --warning:   #d97706;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.10);
  --shadow-xl: 0 24px 60px rgba(0,0,0,.20);
  --radius:    12px;
  --radius-sm: 8px;
}

body.dark {
  --bg:        #0f1115;
  --surface:   #181b21;
  --surface-2: #22262e;
  --border:    #2a2f37;
  --text:      #e5e7eb;
  --text-mute: #9ca3af;
  --text-dim:  #6b7280;
  --accent:    #3b82f6;
  --accent-2:  #60a5fa;
  --success:   #10b981;
  --danger:    #ef4444;
  --warning:   #f59e0b;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 4px 12px rgba(0,0,0,.5);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.6);
  --shadow-xl: 0 24px 60px rgba(0,0,0,.8);
}

/* ============================================
   RESET & BASE
============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding: 1.5rem;
  max-width: 1280px;
  margin: 0 auto;
  line-height: 1.5;
  transition: background .25s, color .25s;
  -webkit-font-smoothing: antialiased;
}

/* ============================================
   HEADER (CENTERED)
============================================ */
.header-center {
  position: relative;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem 1.5rem;
  margin-bottom: 1.2rem;
  box-shadow: var(--shadow-sm);
}

.title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text);
  line-height: 1.15;
  margin-bottom: 0.5rem;
}

.slogan {
  font-size: 0.9rem;
  color: var(--text-mute);
  letter-spacing: 0.3px;
  margin-bottom: 1rem;
}

.header-top-actions {
  position: absolute;
  top: 1rem;
  right: 1rem;
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.icon-btn {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform .15s, background .15s;
}

.icon-btn:hover {
  background: var(--border);
  transform: scale(1.05);
}

.clock {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.8rem;
  min-width: 140px;
}

.clock-date { font-size: 0.68rem; color: var(--text-mute); letter-spacing: 1px; }
.clock-time { font-size: 1.15rem; font-weight: 700; color: var(--text); letter-spacing: 1px; line-height: 1.1; }
.clock-tz   { font-size: 0.6rem; color: var(--text-dim); letter-spacing: 2px; }

/* ============================================
   MONITOR BAR
============================================ */
.monitor-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff;
  padding: 0.85rem 1.4rem;
  border-radius: var(--radius);
  margin-bottom: 1.2rem;
  gap: 1rem;
  flex-wrap: wrap;
  box-shadow: var(--shadow-md);
}

.monitor-status {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.pulse {
  width: 10px;
  height: 10px;
  background: #fff;
  border-radius: 50%;
  position: relative;
  flex-shrink: 0;
}

.pulse::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: #fff;
  animation: pulse 1.8s ease-out infinite;
}

@keyframes pulse {
  0%   { transform: scale(1); opacity: .9; }
  100% { transform: scale(2.6); opacity: 0; }
}

.monitor-actions {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.countdown {
  font-size: 0.75rem;
  opacity: 0.9;
  letter-spacing: 0.5px;
  font-variant-numeric: tabular-nums;
}

/* ============================================
   BUTTONS
============================================ */
.btn {
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all .15s;
  letter-spacing: 0.3px;
  white-space: nowrap;
}

.btn-primary {
  background: #fff;
  color: var(--accent);
  border-color: #fff;
}
.btn-primary:hover {
  background: rgba(255,255,255,.85);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-mute);
  border-color: var(--border);
}
.btn-ghost:hover {
  background: var(--surface-2);
  color: var(--text);
}

/* ============================================
   KPI SUMMARY
============================================ */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.kpi-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  box-shadow: var(--shadow-sm);
  transition: transform .15s, box-shadow .15s;
}

.kpi-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.kpi-label {
  font-size: 0.72rem;
  color: var(--text-mute);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.kpi-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
  font-variant-numeric: tabular-nums;
}

/* ============================================
   SECTIONS
============================================ */
.section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.4rem;
  border-bottom: 1px solid var(--border);
  gap: 1rem;
  flex-wrap: wrap;
  background: var(--surface);
}

.section-title {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.2px;
  color: var(--text);
}

.section-tools {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.badge {
  font-size: 0.68rem;
  background: var(--surface-2);
  color: var(--text-mute);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  letter-spacing: 1px;
  font-weight: 700;
  text-transform: uppercase;
}

.badge.live {
  background: rgba(5,150,105,.12);
  color: var(--success);
  position: relative;
  padding-left: 1.4rem;
}

.badge.live::before {
  content: '';
  position: absolute;
  left: 0.55rem;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
  animation: blink 1.5s infinite;
}

.badge.top {
  background: rgba(217,119,6,.12);
  color: var(--warning);
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.25; }
}

.section-footer {
  padding: 0.7rem 1.4rem;
  font-size: 0.72rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  background: var(--surface-2);
  letter-spacing: 0.3px;
}

/* ============================================
   INPUTS
============================================ */
.input {
  font-family: inherit;
  font-size: 0.8rem;
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
  min-width: 0;
}

.input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

.input.select { cursor: pointer; }
.input-mini { width: 60px; padding: 0.3rem 0.5rem; font-size: 0.75rem; }

.toggle-group {
  display: inline-flex;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: 2px;
  gap: 2px;
}

.toggle-btn {
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.35rem 0.7rem;
  border: none;
  background: transparent;
  color: var(--text-mute);
  border-radius: 6px;
  cursor: pointer;
  transition: all .15s;
}

.toggle-btn.active {
  background: var(--surface);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.alert-toggle {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  color: var(--text-mute);
  cursor: pointer;
}

.alert-toggle input[type="checkbox"] {
  accent-color: var(--accent);
  cursor: pointer;
}

/* ============================================
   SECTION 1: PRICES GRID
============================================ */
.prices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1px;
  background: var(--border);
}

.price-card {
  background: var(--surface);
  padding: 1rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: background .15s;
  min-height: 100px;
  justify-content: center;
}

.price-card:hover {
  background: var(--surface-2);
}

.price-card.loading {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--text-dim);
  font-style: italic;
}

.price-symbol {
  font-size: 0.72rem;
  color: var(--text-mute);
  letter-spacing: 1px;
  font-weight: 700;
  text-transform: uppercase;
}

.price-value {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.3px;
}

.price-change {
  font-size: 0.78rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.positive { color: var(--success); }
.negative { color: var(--danger); }

/* ============================================
   SECTION 2: CHART
============================================ */
.chart-wrapper {
  position: relative;
  height: 300px;
  width: 100%;
  padding: 1.2rem;
}

.chart-legend {
  display: flex;
  justify-content: center;
  gap: 2rem;
  padding: 0 1.2rem 1.2rem;
  font-size: 0.8rem;
  color: var(--text-mute);
  flex-wrap: wrap;
  font-weight: 600;
}

.chart-legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 3px;
}

.dot-btc { background: var(--accent); }
.dot-eth { background: var(--success); }
.dot-bnb { background: var(--warning); }

/* ============================================
   SECTION 3: TABLE
============================================ */
.table-wrapper {
  width: 100%;
  overflow-x: auto;
}

.table-header,
.row {
  display: grid;
  grid-template-columns: 1.2fr 1.2fr 1fr 1.2fr 1fr 0.8fr;
  gap: 0.6rem;
  padding: 0.85rem 1.4rem;
  align-items: center;
  font-size: 0.85rem;
  min-width: 720px;
}

.table-header {
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  font-size: 0.7rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-mute);
  font-weight: 700;
}

.row {
  border-bottom: 1px solid var(--border);
  transition: background .15s;
}

.row:last-child { border-bottom: none; }
.row:hover { background: var(--surface-2); }

.row.loading {
  text-align: center;
  color: var(--text-dim);
  font-style: italic;
  display: block;
  padding: 1.5rem;
}

.row .pair {
  font-weight: 700;
  color: var(--text);
}

.row .exchange {
  color: var(--text-mute);
  font-size: 0.78rem;
}

.row .buy-price  { color: var(--success); font-weight: 700; font-variant-numeric: tabular-nums; }
.row .sell-price { color: var(--danger);  font-weight: 700; font-variant-numeric: tabular-nums; }

.row .spread-val {
  background: var(--accent);
  color: #fff;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  text-align: center;
  justify-self: start;
  font-variant-numeric: tabular-nums;
}

.row .spread-val.high { background: var(--success); }
.row .spread-val.low  { background: var(--text-dim); }

/* ============================================
   SECTION 4: OPPORTUNITIES
============================================ */
.opp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1px;
  background: var(--border);
}

.opp-card {
  background: var(--surface);
  padding: 1.3rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  transition: background .15s;
}

.opp-card:hover { background: var(--surface-2); }

.opp-card.loading {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--text-dim);
  font-style: italic;
}

.opp-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.6rem;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.opp-pair {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
}

.opp-spread {
  background: var(--success);
  color: #fff;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.opp-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  gap: 0.5rem;
}

.opp-label {
  color: var(--text-mute);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  font-weight: 600;
}

.opp-price {
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.opp-price.sell { color: var(--danger); }

.opp-route {
  font-size: 0.72rem;
  color: var(--text-mute);
  background: var(--surface-2);
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  text-align: center;
}

.opp-profit {
  margin-top: 0.3rem;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--border);
  font-size: 0.78rem;
  color: var(--success);
  text-align: center;
  font-weight: 700;
  letter-spacing: 0.5px;
}

/* ============================================
   FOOTER
============================================ */
.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 1.4rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  margin-top: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ============================================
   TOASTS
============================================ */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  z-index: 1000;
  max-width: 340px;
}

.toast {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  font-size: 0.82rem;
  color: var(--text);
  box-shadow: var(--shadow-lg);
  animation: slideIn .25s ease-out;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.toast.success { border-left-color: var(--success); }
.toast.danger  { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }

@keyframes slideIn {
  from { transform: translateX(120%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}

/* ============================================
   PROMO POPUP
============================================ */
.promo-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 17, 21, 0.72);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.2rem;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s ease, visibility .3s ease;
}

.promo-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.promo-modal {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  max-width: 460px;
  width: 100%;
  padding: 2.2rem 1.8rem 1.8rem;
  text-align: center;
  box-shadow: var(--shadow-xl);
  transform: translateY(20px) scale(.96);
  transition: transform .35s cubic-bezier(.2,.9,.3,1.2);
}

.promo-overlay.visible .promo-modal {
  transform: translateY(0) scale(1);
}

.promo-close {
  position: absolute;
  top: 0.9rem;
  right: 0.9rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-mute);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .15s, color .15s, transform .15s;
}

.promo-close:hover {
  background: var(--border);
  color: var(--text);
  transform: rotate(90deg);
}

.promo-icon {
  font-size: 2.6rem;
  margin-bottom: 0.6rem;
  line-height: 1;
}

.promo-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 0.6rem;
  letter-spacing: -0.3px;
}

.promo-text {
  font-size: 0.88rem;
  color: var(--text-mute);
  line-height: 1.55;
  margin-bottom: 1.4rem;
}

.promo-text strong {
  color: var(--text);
  font-weight: 700;
}

.promo-cta {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.75rem 1.8rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.4px;
  box-shadow: var(--shadow-md);
  transition: transform .15s, box-shadow .15s;
  margin-bottom: 0.9rem;
  width: 100%;
  max-width: 240px;
}

.promo-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.promo-dismiss {
  display: block;
  margin: 0 auto;
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-family: inherit;
  font-size: 0.78rem;
  cursor: pointer;
  padding: 0.4rem 0.8rem;
  transition: color .15s;
  letter-spacing: 0.3px;
}

.promo-dismiss:hover {
  color: var(--text-mute);
  text-decoration: underline;
}

/* ============================================
   RESPONSIVE
============================================ */
@media (max-width: 900px) {
  .title { font-size: 1.5rem; }
  .slogan { font-size: 0.82rem; }
  .kpi-value { font-size: 1.15rem; }
  .chart-wrapper { height: 240px; }
  .section-title { font-size: 0.9rem; }
}

@media (max-width: 640px) {
  body { padding: 0.9rem; }

  .header-center {
    padding: 3.5rem 1rem 1.2rem;
  }

  .header-top-actions {
    top: 0.8rem;
    right: 0.8rem;
  }

  .title {
    font-size: 1.15rem;
    letter-spacing: -0.2px;
  }

  .slogan {
    font-size: 0.72rem;
  }

  .clock {
    min-width: 0;
    padding: 0.3rem 0.6rem;
  }

  .clock-date { font-size: 0.6rem; }
  .clock-time { font-size: 0.95rem; }

  .monitor-bar {
    flex-direction: column;
    align-items: stretch;
    text-align: left;
    padding: 1rem;
  }

  .monitor-actions {
    justify-content: space-between;
  }

  .kpi-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.7rem;
  }

  .kpi-value { font-size: 1rem; }

  .section-header {
    flex-direction: column;
    align-items: stretch;
    padding: 0.9rem 1rem;
  }

  .section-tools { width: 100%; }
  .input { width: 100%; }
  .input-mini { width: 60px; }
  .input.select { width: auto; }

  .prices-grid { grid-template-columns: repeat(2, 1fr); }
  .price-value { font-size: 1.05rem; }

  .chart-wrapper { height: 200px; padding: 0.6rem; }
  .chart-legend { gap: 1rem; font-size: 0.72rem; }

  /* Table → cards */
  .table-header { display: none; }

  .row {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
    padding: 1rem;
    min-width: 0;
  }

  .row .pair {
    font-size: 1rem;
    width: 100%;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.4rem;
  }

  .row .exchange::before { content: "Exchange: "; color: var(--text-dim); }
  .row .buy-price::before { content: "Buy: "; color: var(--text-dim); font-weight: 400; }
  .row .sell-price::before { content: "Sell: "; color: var(--text-dim); font-weight: 400; }
  .row .spread-val::before { content: "Spread: "; background: none; color: var(--text-dim); padding: 0; }
  .row .spread-val { background: transparent; color: var(--accent); padding: 0; }

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

  .toast-container {
    left: 0.9rem;
    right: 0.9rem;
    bottom: 0.9rem;
    max-width: none;
  }

  .footer {
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
  }

  .promo-modal {
    padding: 1.8rem 1.3rem 1.4rem;
  }

  .promo-title { font-size: 1.05rem; }
  .promo-text  { font-size: 0.82rem; }
}