/* style.css */

*{
  margin:0;
  padding:0;
  box-sizing:border-box;
}

body{
  font-family: Arial, Helvetica, sans-serif;
  background:#eef5ff;
  color:#1f2937;
  line-height:1.6;
  padding-bottom:60px;
}

.back-btn{
  position:fixed;
  top:16px;
  left:16px;
  z-index:100;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:42px;
  padding:10px 16px;
  background:white;
  color:#2563eb;
  border:1px solid rgba(37,99,235,0.2);
  border-radius:999px;
  font-weight:bold;
  text-decoration:none;
  box-shadow:0 4px 14px rgba(0,0,0,0.12);
}

.back-btn::before{
  content:"<";
  margin-right:8px;
  font-weight:900;
}

.back-btn:hover{
  background:#dbeafe;
}

/* TOP BAR */

.topbar{
  background:linear-gradient(135deg,#3b82f6,#60a5fa);
  color:white;
  padding:20px;
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  align-items:center;
  gap:15px;
  box-shadow:0 4px 12px rgba(0,0,0,0.15);
}

.topbar h1{
  font-size:28px;
  font-weight:700;
}

.budget-box,
.stress-box{
  background:rgba(255,255,255,0.15);
  padding:12px 18px;
  border-radius:14px;
  font-weight:bold;
  backdrop-filter:blur(8px);
}

/* GENERAL SECTIONS */

section{
  width:92%;
  max-width:1300px;
  margin:28px auto;
}

/* INTRO CARD */

.intro-card,
.slang-card,
.marketplace-card,
.chat-section,
.challenge-section,
.guide-intro,
.guide-table-section,
.seller-lines{
  background:white;
  border-radius:24px;
  padding:28px;
  box-shadow:0 8px 25px rgba(0,0,0,0.08);
}

h2{
  margin-bottom:18px;
  color:#2563eb;
  font-size:28px;
}

/* WARNING GRID */

.warning-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:16px;
  margin-top:20px;
}

.warning{
  background:#dbeafe;
  padding:16px;
  border-radius:16px;
  font-size:15px;
  font-weight:600;
}

/* TABLES */

.table-wrapper{
  overflow-x:auto;
  margin-top:20px;
}

table{
  width:100%;
  min-width:1100px;
  border-collapse:collapse;
}

th{
  background:#3b82f6;
  color:white;
  padding:16px;
  text-align:left;
  font-size:15px;
}

td{
  padding:16px;
  border-bottom:1px solid #e5e7eb;
  vertical-align:top;
  background:white;
}

tr:hover td{
  background:#f8fbff;
}

/* PRODUCT IMAGES */

.product-img{
  width:100px;
  height:100px;
  object-fit:cover;
  border-radius:14px;
  border:3px solid #dbeafe;
}

/* INPUTS */

.price-input{
  width:90px;
  padding:10px;
  border-radius:10px;
  border:1px solid #cbd5e1;
  font-size:15px;
}

/* BUTTONS */

button{
  background:#2563eb;
  color:white;
  border:none;
  padding:10px 18px;
  border-radius:12px;
  cursor:pointer;
  font-weight:bold;
  margin-bottom:8px;
  transition:0.2s;
}

button:hover{
  background:#1d4ed8;
  transform:translateY(-2px);
}

.skip-btn{
  background:#94a3b8;
}

.skip-btn:hover{
  background:#64748b;
}

/* DETAILS */

details{
  margin-top:10px;
  background:#eff6ff;
  border-radius:12px;
  padding:10px;
}

summary{
  cursor:pointer;
  font-weight:bold;
  color:#2563eb;
}

details p{
  margin-top:10px;
  font-size:14px;
  line-height:1.7;
}

/* CHAT SYSTEM */

.chat-box{
  background:#f1f5f9;
  border-radius:22px;
  padding:24px;
}

.seller-msg{
  background:white;
  padding:14px 18px;
  border-radius:18px;
  width:fit-content;
  max-width:80%;
  margin-bottom:14px;
  box-shadow:0 2px 8px rgba(0,0,0,0.06);
  font-size:15px;
}

.student-options{
  margin-top:18px;
  display:flex;
  flex-wrap:wrap;
  gap:12px;
}

.chat-btn{
  background:#dbeafe;
  color:#1e3a8a;
  border:none;
  padding:12px 16px;
  border-radius:14px;
  font-weight:600;
}

.chat-btn:hover{
  background:#bfdbfe;
}

/* CHALLENGE CARDS */

.challenge-grid,
.line-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:18px;
  margin-top:20px;
}

.challenge-card,
.line-card{
  background:#eff6ff;
  border-radius:18px;
  padding:20px;
  font-weight:600;
  min-height:110px;
  display:flex;
  align-items:center;
  box-shadow:0 4px 12px rgba(0,0,0,0.05);
}

/* GUIDE TABLE */

.guide-table-section table td{
  font-size:15px;
}

.guide-table-section table tr:nth-child(even) td{
  background:#f8fbff;
}

/* MOBILE */

@media(max-width:900px){

  .topbar{
    flex-direction:column;
    align-items:flex-start;
  }

  .topbar h1{
    font-size:24px;
  }

  h2{
    font-size:24px;
  }

  .product-img{
    width:80px;
    height:80px;
  }

  button{
    width:100%;
  }

  .student-options{
    flex-direction:column;
  }

}

@media(max-width:600px){

  section{
    width:95%;
  }

  .intro-card,
  .slang-card,
  .marketplace-card,
  .chat-section,
  .challenge-section,
  .guide-intro,
  .guide-table-section,
  .seller-lines{
    padding:20px;
    border-radius:20px;
  }

  td,
  th{
    padding:12px;
    font-size:14px;
  }

  .warning{
    font-size:14px;
  }

  .challenge-card,
  .line-card{
    min-height:auto;
  }

}

.marketplace-link {
  margin: 10px 0 20px 0;
  font-size: 14px;
}

.marketplace-link a {
  color: #1877f2;
  text-decoration: none;
  font-weight: 600;
}

.marketplace-link a:hover {
  text-decoration: underline;
}