@import url('https://fonts.googleapis.com/css2?family=Space+Mono:ital,wght@0,400;0,700;1,400;1,700&display=swap');

:root {
  --sb-bg: #2a2a2a;
  --sb-paper: #f9f9f9;
  --sb-ink: #1a1a1a;
  --font-mono: 'Space Mono', 'Courier New', Courier, monospace;
}

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  color: var(--sb-ink);
  background-color: var(--sb-bg);
  overflow-x: hidden;
  font-size: 14px;
}

/* Hide scrollbar when popup is active */
body.popup-active {
  overflow: hidden;
}

/* Receipt paper look */
.sb-receipt {
  background-color: var(--sb-paper);
  color: var(--sb-ink);
  width: 90%;
  max-width: 380px;
  margin: 20px auto;
  padding: 20px 15px;
  position: relative;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
}

/* Jagged top and bottom */
.sb-receipt::before, .sb-receipt::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 10px;
  background-size: 10px 10px;
  z-index: 10;
}
.sb-receipt::before {
  top: -10px;
  background-image: 
    linear-gradient(135deg, transparent 50%, var(--sb-paper) 50%), 
    linear-gradient(225deg, transparent 50%, var(--sb-paper) 50%);
  background-position: 0 0, 5px 0;
}
.sb-receipt::after {
  bottom: -10px;
  background-image: 
    linear-gradient(45deg, transparent 50%, var(--sb-paper) 50%), 
    linear-gradient(315deg, transparent 50%, var(--sb-paper) 50%);
  background-position: 0 0, 5px 0;
}

/* =========================================
   COVER POPUP
   ========================================= */
#introOverlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0,0,0,0.85);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-y: auto;
  padding: 20px;
}

.cover-receipt {
  margin: auto;
}

/* =========================================
   MAIN APP
   ========================================= */
.sb-app {
  display: none;
  opacity: 0;
  transition: opacity 0.5s;
  padding: 20px 0 50px;
}

/* Typography & Layout */
.sb-header {
  text-align: center;
  margin-bottom: 20px;
}
.sb-logo {
  font-size: 1.8rem;
  font-weight: bold;
  letter-spacing: -1px;
  margin-bottom: 5px;
}
.sb-text {
  line-height: 1.4;
  margin-bottom: 2px;
  word-wrap: break-word;
}
.sb-divider {
  overflow: hidden;
  white-space: nowrap;
  margin: 10px 0;
  letter-spacing: 2px;
  opacity: 0.8;
}
.sb-center {
  text-align: center;
}

/* Buttons */
.sb-btn-open, .sb-btn {
  background: transparent;
  color: var(--sb-ink);
  border: 2px solid var(--sb-ink);
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  text-transform: uppercase;
  transition: all 0.2s;
  display: inline-block;
  text-decoration: none;
}
.sb-btn-open:hover, .sb-btn:hover {
  background: var(--sb-ink);
  color: var(--sb-paper);
}

.sb-audio-btn {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--sb-paper);
  color: var(--sb-ink);
  border: 2px solid var(--sb-ink);
  padding: 10px;
  font-family: var(--font-mono);
  font-weight: bold;
  cursor: pointer;
  z-index: 9999;
}

/* Sections */
.sb-section {
  margin-top: 25px;
}

/* Countdown */
.sb-countdown {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 5px;
  font-size: 1.5rem;
  font-weight: bold;
}
.sb-cd-item {
  text-align: center;
}
.sb-cd-item span {
  display: inline-block;
}
.sb-cd-item small {
  font-size: 0.7rem;
  display: block;
}

/* Images (Dither / Grayscale effect) */
.sb-dither-img {
  width: 100%;
  border: 2px solid var(--sb-ink);
  padding: 4px;
  background: #fff;
}
.sb-dither-img img {
  width: 100%;
  height: auto;
  display: block;
  /* Fake thermal print look */
  filter: grayscale(100%) contrast(150%) brightness(110%);
  mix-blend-mode: multiply;
}

/* Forms */
.sb-form-group {
  margin-bottom: 15px;
}
.sb-form-group label {
  display: block;
  font-weight: bold;
  margin-bottom: 5px;
}
.sb-input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 2px dashed var(--sb-ink);
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--sb-ink);
  padding: 5px 0;
}
.sb-input:focus {
  outline: none;
  border-bottom-style: solid;
}

/* Scrollbar for history */
.sb-scroll::-webkit-scrollbar {
  width: 6px;
}
.sb-scroll::-webkit-scrollbar-track {
  background: transparent;
  border-left: 1px dashed var(--sb-ink);
}
.sb-scroll::-webkit-scrollbar-thumb {
  background: var(--sb-ink);
}

.sb-footer {
  margin-top: 40px;
}