* {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    box-sizing: border-box;
}

body {
    background-color: white;
}


.bigView {
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: row;
    padding: 30px;
    background-color: #f7f7f8; /* subtle page background */
}

.turing-simulator {
    overflow: hidden;
    padding: 30px 30px;
    height: 90vh;
    width: 65vw;
    background-color: #ffffff;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    border: 1px solid #e2e2e2;
    border-radius: 12px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
    transition: box-shadow 0.2s ease;
}

.turing-simulator:hover , .ide:hover, .remarks:hover{
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.code-part {
    display: flex;
    flex-direction: column;
    width: 35vw;
    height: 90vh;
    background-color: white;
    border: 1px solid #e3e6ea;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    margin-left: 20px;
    padding: 15px;
    gap: 12px; /* space between ide and remarks */
}

.ide {
    flex: 3;
    background-color: #f8fafc;
    border: 1px solid #edf0f3;
    border-radius: 8px;
    padding: 15px;
    font-family: 'Consolas', monospace;
    font-size: 0.95rem;
    color: #333;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.05);

}

.remarks {

    background-color: #fdfdfd;
    border: 1px solid #edf0f3;
    border-radius: 8px;
    padding: 12px;
    font-size: 0.9rem;
    color: #444;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.03);
    height: 40%;
    overflow-y: auto;
    flex: 0 0 auto; /* disable flex growth/shrink */
}
.remarks:hover{
    cursor: pointer;
}

#ide-area {
    width: 100%;
    height: 90%;
    background-color: transparent;
    border: none;
    outline: none;
    resize: none;
    font-family: "Consolas", "Courier New", monospace;
    font-size: 0.95rem;
    line-height: 1.5;
    color: #1e293b; /* base text */
    padding: 10px;
    overflow-y: auto;
    caret-color: #111;
}
#run-code-btn {
  
  bottom: 10px;
  right: 10px;
  background-color: #2563eb;
  color: white;
  border: none;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background-color 0.2s;
}
#stop-code-btn{
  bottom: 10px;
  left: 10px;
  background-color: #b91c1c;
  color: white;
  border: none;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background-color 0.2s;  
}
#run-btn:hover {
  background-color: #1d4ed8;
}
/* Remove weird blue focus outline */
#ide-area:focus {
    outline: none;
    border: none;
}

/* Selection color */
#ide-area::selection {
    background: #c7d2fe;
    color: #111;
}

/* Optional — make it look like code syntax */
.syntax-keyword { color: #2563eb; font-weight: 600; }
.syntax-string { color: #16a34a; }
.syntax-number { color: #d97706; }
.syntax-comment { color: #9ca3af; font-style: italic; }


/* Optional redundancy, but good practice */
#ide-area:focus {
    outline: none;
    border: none;
}

.turing-simulator h1 {
    font-size: 1.8rem;
    font-weight: 600;
    text-align: center;
    color: #222;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.controls {
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

#tm-input {
    width: 60%;
    padding: 10px 14px;
    border: 1px solid #dcdfe4;
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: monospace;
    outline: none;
    transition: all 0.2s ease;
}

#tm-input:focus {
    border-color: #0077ff;
    box-shadow: 0 0 4px rgba(0,119,255,0.2);
}

#run-btn {
    background-color: #0077ff;
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 10px 18px;
    font-size: 0.95rem;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s ease;
}

#run-btn:hover {
    background-color: #005fd1;
}

.tape-view {
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;          /* hide extra tape parts */
    background-color: #f8fafc;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    width: 850px;              /* visible area (16 squares * 40px) */
    height: 80px;              /* a bit taller for breathing space */
    margin: 60px auto;
    position: relative;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

/* Continuous perfect squares */
.tape-cell {
    width: 40px;
    height: 40px;              /* equal width/height → square */
    flex: 0 0 40px;            /* prevents stretch */
    background-color: #fff;
    border: 1px solid #d1d5db;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: monospace;
    font-size: 1.1rem;
    color: #333;
    box-sizing: border-box;
}

/* Active cell highlight */
.tape-cell.active {
    background-color: #e0e7ff;
    border-color: #2563eb;
    box-shadow: inset 0 0 3px #2563eb;
}

/* Center pointer */
.pointer {

    top: 8px;
    left: 50%;
    transform: translateX(-50%) translateY(-100%);
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 12px solid #2563eb;
    z-index: 10;
}

.tape-cell.writing {
    background-color: #dbeafe;
    color: #1e3a8a;
    transition: background-color 0.2s ease;
}

.speed-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin: 10px auto 0 auto;
    width: 90%;
    font-family: "Consolas", "Courier New", monospace;
    color: #e2e8f0;
    border: none;
    padding: 12px;
    align-self: baseline;
}

.speed-control label {
    font-size: 0.9rem;
    font-weight: 600;
    color: #2563eb;
}

#speed-slider {
    width: 50%;
    height: 5px;
    background: linear-gradient(to right, #2563eb, #60a5fa);
    border-radius: 5px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

/* Custom thumb */
#speed-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #3b82f6;
    box-shadow: 0 0 6px #3b82f6;
    transition: all 0.2s ease;
}

#speed-slider::-webkit-slider-thumb:hover {
    background: #60a5fa;
    box-shadow: 0 0 12px #60a5fa;
}

#speed-value {
    font-size: 0.9rem;
    color: #2563eb;
    min-width: 70px;
    text-align: right;
}

#log-area {
    max-height: 200px;       /* fixed height */
    overflow-y: auto;        /* scroll when content overflows */
    margin-top: 10px;
    padding: 10px;
    background-color: #f9fafb; /* subtle background */
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 0.95rem;
    box-shadow: 0 2px 6px rgba(0,0,0,0.03);
}

/* Message boxes */
.log-message {
    padding: 10px 15px;
    margin: 5px 0;
    border-radius: 6px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
    font-size: 0.95rem;
    transition: all 0.3s ease;
    opacity: 0; /* start hidden for fade-in */
}

/* Success */
.log-message.success {
    color: #065f46;
    background-color: #d1fae5;
}

/* Error */
.log-message.error {
    color: #b91c1c;
    background-color: #fee2e2;
}