:root{
      --bg:#f3f4f6; --card:#ffffff; --muted:#6b7280; --accent:#1f2937; --blue:#2563eb; --red:#dc2626;
      --maxw:1100px;
    }
    *{box-sizing:border-box}
    body{margin:0;font-family:Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;background:var(--bg);color:var(--accent);}
    .container{max-width:var(--maxw);margin:0 auto;padding:20px;}
    header{display:flex;align-items:center;justify-content:space-between;padding:14px 0;}
    header h1{margin:0;font-size:20px;}
    .nav{display:flex;gap:12px;align-items:center;}
    button{cursor:pointer}
    .btn{background:var(--blue);color:white;padding:8px 12px;border-radius:8px;border:0;font-weight:600;}
    .btn-ghost{background:transparent;border:1px solid #e5e7eb;padding:8px 12px;border-radius:8px;}
    .hero{background:linear-gradient(90deg,#fff 0,#f8fafc 100%);padding:18px;border-radius:12px;box-shadow:0 1px 4px rgba(0,0,0,.04);display:flex;align-items:center;justify-content:space-between;gap:16px}
    .hero-left{flex:1}
    .hero h2{margin:0 0 4px 0;font-size:20px}
    .hero p{margin:0;color:var(--muted)}
    .hero .finish{background:var(--red);color:white;padding:8px 12px;border-radius:8px;border:0}
    .grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin-top:16px}
    .card{background:var(--card);padding:12px;border-radius:10px;box-shadow:0 1px 4px rgba(0,0,0,.04);display:flex;flex-direction:column;justify-content:space-between;min-height:120px}
    .title{font-weight:700;margin-bottom:6px}
    .author{color:var(--muted);font-size:13px;margin-bottom:10px}
    .card .actions{display:flex;gap:8px}
    .focus{background:#0ea5a4;color:white;border:0;padding:8px;border-radius:8px;flex:1}
    .finish-small{background:var(--red);color:white;border:0;padding:8px;border-radius:8px;flex:1}
    footer{margin-top:28px;padding:18px 0;text-align:center;color:var(--muted);font-size:14px}
    .bottom{display:flex;justify-content:space-between;align-items:center;margin-top:18px;gap:12px}
    .pagination button{padding:6px 10px;border-radius:8px;border:1px solid #e5e7eb;background:white}
    .search{display:flex;gap:8px;align-items:center}
    input[type="text"], input[type="email"]{padding:8px;border-radius:8px;border:1px solid #e5e7eb}
    /* modal */
    .modal-back{position:fixed;inset:0;background:rgba(0,0,0,.45);display:flex;align-items:center;justify-content:center;z-index:60}
    .modal{background:white;padding:18px;border-radius:10px;max-width:420px;width:100%}
    .muted{color:var(--muted)}
    .pill{background:#eef2ff;color:#3730a3;padding:6px 8px;border-radius:999px;font-weight:600;font-size:13px}
    .history-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:8px;margin-top:10px}
    .badge{font-size:12px;background:#f1f5f9;padding:6px 8px;border-radius:8px;color:var(--muted);display:inline-block}
    .small{font-size:13px}

    /* 📱 Professional Mobile Layout - Compact & Balanced */
@media (max-width: 768px) {
  :root {
    --maxw: 100%;
  }

  body {
    font-size: 14px;
    padding: 0 8px;
  }

  /* ---- Header ---- */
  header {
    flex-direction: column;
    align-items: stretch;
    padding: 8px 0;
    gap: 6px;
  }

  /* Slogan fits in one line */
  header h1 {
    font-size: 16px;
    line-height: 1.1;
    white-space: nowrap;
  }

  /* Telegram pill: icon only on mobile */
  .nav a span {
    display: none; /* hide text */
  }

  .nav img, .nav i, .nav svg {
    width: 20px;
    height: 20px;
  }

  /* Right-side controls (Signed in, Finished, Logout) in one line */
  .top-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    flex-wrap: nowrap;
  }

  .btn, .btn-ghost {
    padding: 5px 8px;
    font-size: 10px;
    white-space: nowrap;
    border: none;
  }

  /* ---- Hero section ---- */
  .hero {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 10px;
    border-radius: 10px;
    margin: 8px 0;
  }

  #heroActions {
    text-align: center;
  }
  .hero h2 {
    font-size: 16px;
  }

  .hero p {
    font-size: 12px;
    color: var(--muted);
  }

  .hero .finish {
    font-size: 12px;
    padding: 6px 10px;
    margin-top: 8px;
  }

  /* ---- Search + Buttons ---- */
  .search {
    display: flex;
    flex-direction: row;
    gap: 6px;
    align-items: center;
    margin-top: 6px;
  }

  .search input {
    flex: 1;
    font-size: 13px;
    padding: 6px;
  }

  .search button {
    font-size: 12px;
    padding: 6px 8px;
  }

  /* ---- All books + Focus random ---- */
  .bottom {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    gap: 6px;
    margin: 10px 0;
  }

  .bottom span, .bottom button {
    font-size: 13px;
    white-space: nowrap;
  }
  /* ---- Book Grid ---- */
  .grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-top: 10px;
  }

  .card {
    background: var(--card);
    padding: 6px;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

.card img {
  width: 100%;
  aspect-ratio: 3 / 4; /* consistent book shape */
  object-fit: cover;
  object-position: center;
  border-radius: 8px;
  margin-bottom: 6px;
  background-color: #f4f4f4; /* subtle fallback if image missing */
}

  .title {
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 2px;
  }

  .author {
    font-size: 10px;
    color: var(--muted);
    margin-bottom: 4px;
  }

  .card .actions {
    display: flex;
    gap: 4px;
    width: 100%;
  }

  .focus, .finish-small {
    font-size: 11px;
    padding: 4px;
    flex: 1;
    border-radius: 6px;
  }

  /* ---- Pagination ---- */
  .pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 12px;
  }

  .pagination button {
    font-size: 12px;
    padding: 6px 10px;
  }

  /* ---- Tip below pagination ---- */
  .tip {
    text-align: center;
    font-size: 12px;
    color: var(--muted);
    margin-top: 6px;
  }

  /* ---- Footer ---- */
  footer {
    font-size: 12px;
    margin-top: 20px;
  }
}

/************************/
/* === MODAL IMPROVEMENTS === */
.modal-back {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

.modal {
  background: white;
  border-radius: 16px;
  padding: 24px;
  width: 90%;
  max-width: 500px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  animation: fadeIn 0.25s ease;
}

/* Title + close button */
.modal header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.modal header h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0;
}

.modal header button {
  border: none;
  background: transparent;
  font-size: 0.9rem;
  color: #6b7280;
  cursor: pointer;
}

.modal header button:hover {
  color: #111827;
}

/* Book history grid inside modal */
.history-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

.history-list .badge {
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 10px;
  text-align: left;
  color: #1f2937;
  transition: transform 0.15s ease;
}

.history-list .badge:hover {
  transform: scale(1.02);
}

/* Animation */
@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

/* === MOBILE OPTIMIZATION === */
@media (max-width: 768px) {
  .modal {
    width: 95%;
    max-width: none;
    padding: 18px;
  }

  .modal header h3 {
    font-size: 1rem;
  }

  .history-list {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .history-list .badge {
    font-size: 13px;
    padding: 8px;
  }
}

/* 🔵 Smooth infinite scroll banner */
.info-banner {
  background: linear-gradient(90deg, #2563eb, #3b82f6);
  color: #fff;
  border-radius: 10px;
  padding: 8px 0;
  margin: 12px 0;
  font-size: 14px;
  font-weight: 500;
  overflow: hidden;
  position: relative;
  box-shadow: 0 1px 6px rgba(0,0,0,0.1);
  white-space: nowrap;
}

.scroll-text {
  display: inline-flex;
  white-space: nowrap;
  animation: scroll-left 20s linear infinite;
}

.scroll-text span {
  display: inline-block;
  padding-right: 100px; /* spacing between the two texts */
}

@keyframes scroll-left {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

.info-banner a {
  color: #ffeb3b;
  text-decoration: none;
  font-weight: 600;
}

.info-banner a:hover {
  text-decoration: underline;
}

/* 🖱️ Optional pause on hover */
.info-banner:hover .scroll-text {
  animation-play-state: paused;
}

/* 📱 Mobile */
@media (max-width: 768px) {
  .info-banner {
    font-size: 12px;
    margin: 10px 0;
  }
}