/* TOKENS */
:root {
  /* --canvas: #F8FAFC; */
  --canvas: #e1e8ee;
  --surface: #FFFFFF;
  --ink-900: #0F172A;
  --ink-700: #1E293B;
  --ink-500: #475569;
  --ink-300: #94A3B8;
  --line: #E2E8F0;
  --accent: #0EA5E9;
  --accent-dark: #0284C7;
  --accent-tint: #E0F2FE;
  --good: #16A34A;
  --good-tint: #DCFCE7;
  --warn: #D97706;
  --warn-tint: #FEF3C7;

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Roboto Mono', ui-monospace, monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.06), 0 1px 1px rgba(15, 23, 42, 0.04);
  --shadow-modal: 0 20px 50px rgba(15, 23, 42, 0.25);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--canvas);
  color: var(--ink-700);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

button, input {
  font-family: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}


   /* TOPBAR */

.topbar {
  background: var(--ink-900);
  border-bottom: 1px solid var(--ink-700);
  position: sticky;
  top: 0;
  z-index: 20;
}

.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  flex-shrink: 0;
  position: relative;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 9px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.85);
  border-right-color: transparent;
}

.brand-text h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  color: #F1F5F9;
  letter-spacing: -0.01em;
}

.brand-sub {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--ink-300);
  font-variant-numeric: tabular-nums;
}


   /* BUTTONS */
.btn {
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.08s ease, background 0.15s ease, border-color 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-dark); }

.btn-ghost {
  background: transparent;
  color: var(--ink-500);
  border-color: var(--line);
}
.btn-ghost:hover { background: var(--canvas); color: var(--ink-700); }

.btn-plus {
  font-size: 16px;
  line-height: 1;
  font-weight: 700;
}

.btn-danger-text {
  color: #DC2626;
}

.btn-block { width: 100%; justify-content: center; }

   /* MAIN / EMPTY STATE */
.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 24px 60px;
}

.empty-state {
  border: 1.5px dashed var(--line);
  border-radius: var(--radius-lg);
  padding: 56px 24px;
  text-align: center;
  background: var(--surface);
}

.empty-title {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-700);
}

.empty-sub {
  margin: 0;
  font-size: 14px;
  color: var(--ink-300);
}


   /* SESSION GRID + CARD */
.session-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.session-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 12px;
  animation: cardIn 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

.session-card.leaving {
  animation: cardOut 0.22s ease forwards;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(6px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes cardOut {
  to { opacity: 0; transform: translateY(-4px) scale(0.97); }
}

.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}

.card-name {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-900);
  overflow-wrap: anywhere;
}

.card-amount {
  font-size: 13px;
  color: var(--ink-500);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.card-timer {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 600;
  color: var(--accent-dark);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  font-size: 12.5px;
  color: var(--ink-300);
}

.status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 5px;
  box-shadow: 0 0 0 3px var(--accent-tint);
}

.card-end-btn {
  margin-top: 2px;
  background: var(--ink-900);
  color: #fff;
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  font-size: 13.5px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.08s ease;
}
.card-end-btn:hover { background: var(--ink-700); }
.card-end-btn:active { transform: scale(0.97); }


   /* MODALS */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 100;
}

.modal-overlay.open {
  display: flex;
  animation: overlayIn 0.15s ease;
}

@keyframes overlayIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal {
  background: var(--surface);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-modal);
  animation: modalIn 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  max-height: 90vh;
  overflow-y: auto;
}

@keyframes modalIn {
  from { opacity: 0; transform: translateY(10px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 22px 4px;
}

.modal-head h2 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-900);
}

.modal-close {
  background: none;
  border: none;
  font-size: 22px;
  line-height: 1;
  color: var(--ink-300);
  cursor: pointer;
  padding: 4px;
}
.modal-close:hover { color: var(--ink-700); }

.modal-body {
  padding: 16px 22px 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-500);
}

.field input {
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 14.5px;
  color: var(--ink-900);
  background: var(--canvas);
  transition: border-color 0.15s ease;
}

.field input:focus {
  border-color: var(--accent);
  outline: none;
  background: #fff;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.field-hint {
  margin: -6px 0 0;
  font-size: 12.5px;
  color: var(--ink-300);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 4px;
}

/* End-session summary */
.summary-block {
  background: var(--canvas);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 13.5px;
}

.summary-row span { color: var(--ink-500); }
.summary-row strong { color: var(--ink-900); font-weight: 600; }
.summary-row strong.mono { font-family: var(--font-mono); }

.status-banner {
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 13px;
  font-weight: 500;
}

.status-banner.under {
  background: var(--warn-tint);
  color: #92400E;
}

.status-banner.over {
  background: var(--good-tint);
  color: #166534;
}

.refund-block input {
  font-family: var(--font-mono);
}


   /* TOAST */
.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--ink-900);
  color: #fff;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 200;
  box-shadow: 0 10px 30px rgba(15,23,42,0.3);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}


   /* RESPONSIVE */
@media (max-width: 640px) {
  .topbar-inner { padding: 14px 16px; }
  .brand-text h1 { font-size: 15.5px; }
  .btn { padding: 9px 12px; font-size: 13.5px; }
  .main { padding: 20px 16px 48px; }
  .session-grid { grid-template-columns: 1fr; }
  .field-row { grid-template-columns: 1fr; }
  .card-timer { font-size: 26px; }
}