@import url('https://fonts.googleapis.com/css2?family=Bungee&display=swap');

:root {
  /* Bảng màu Retro 20 màu */
  --color-1: #E27D60;  --color-2: #85DCBA;  --color-3: #E8A87C;  --color-4: #C38D9E;  --color-5: #41B3A3;
  --color-6: #E9C46A;  --color-7: #F4A261;  --color-8: #E76F51;  --color-9: #D4A373;  --color-10: #FAEDCB;
  --color-11: #A8DADC; --color-12: #457B9D; --color-13: #1D3557; --color-14: #2A9D8F; --color-15: #264653;
  --color-16: #C9E4DE; --color-17: #A3B18A; --color-18: #588157; --color-19: #A5A58D; --color-20: #F4F1DE;
}

.hidden { display: none !important; }

/* WRAPPER NỀN TRẮNG */
.logexp-neo-wrapper {
    font-family: system-ui, -apple-system, sans-serif;
    max-width: 900px; margin: 30px auto; background: #fff;
    border: 3px solid #000; border-radius: 16px; box-shadow: 10px 10px 0px #000;
    padding: 25px; box-sizing: border-box; color: #000;
}
.logexp-neo-wrapper * { box-sizing: border-box; }

.logexp-header {
    background: var(--color-20); padding: 20px; border-radius: 12px;
    border: 3px solid #000; box-shadow: 4px 4px 0px #000; margin-bottom: 25px; text-align: center;
}
.logexp-header h2 { margin: 0 0 10px 0; font-size: 1.8rem; font-weight: 900; text-transform: uppercase; color: #111;}
.logexp-header p { margin: 0; font-weight: 700; font-size: 1rem; color: #333; }

/* BỐ CỤC GRID & CARD */
.logexp-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 25px;}
.logexp-card { border: 3px solid #000; padding: 20px; border-radius: 12px; box-shadow: 4px 4px 0px #000; display: flex; flex-direction: column;}
.card-title { margin: 0 0 15px 0; font-size: 1.25rem; font-weight: 900; text-transform: uppercase; border-bottom: 2px dashed #000; padding-bottom: 10px;}

.bg-mustard { background: var(--color-6); }
.bg-powder { background: var(--color-11); }
.bg-mint { background: var(--color-2); }
.bg-eggshell { background: var(--color-20); }

/* MASTER RULE: NHÃN ĐEN, ĐẬM, IN HOA */
.logexp-neo-wrapper label { display: block; color: #000 !important; font-weight: 900; font-size: 1.05rem; margin-bottom: 8px; text-transform: uppercase;}

/* INPUT STYLES */
.logexp-group { margin-bottom: 15px; }
.logexp-input {
    width: 100%; padding: 12px 15px; font-size: 1.25rem; font-weight: 900; font-family: 'Courier New', monospace;
    border: 3px dashed #000; border-radius: 8px; outline: none; background: #fff; transition: 0.1s;
}
.logexp-input:focus { border-style: solid; border-color: var(--color-15); box-shadow: 4px 4px 0px var(--color-15); transform: translateY(-2px); }
.logexp-input:disabled { background: #e0e0e0; cursor: not-allowed; border-style: solid; }

/* SELECTOR (DROPDOWN) */
.logexp-base-selector { display: grid; grid-template-columns: 1.2fr 1fr; gap: 10px; }
.logexp-select {
    width: 100%; padding: 12px 10px; font-size: 1.05rem; font-weight: 900; font-family: inherit;
    border: 3px solid #000; border-radius: 8px; outline: none; background: #fff; cursor: pointer;
    box-shadow: 2px 2px 0px #000; transition: 0.1s;
}
.logexp-select:active { transform: translate(2px, 2px); box-shadow: 0px 0px 0px #000; }

/* BUTTON TÍNH TOÁN */
.logexp-btn-calc {
    width: 100%; padding: 15px; font-size: 1.25rem; font-weight: 900; text-transform: uppercase; margin-top: auto;
    background: var(--color-13); color: #fff; border: 3px solid #000; border-radius: 10px;
    box-shadow: 5px 5px 0px #000; cursor: pointer; transition: 0.1s; letter-spacing: 1px;
}
.logexp-btn-calc:active { transform: translate(4px, 4px); box-shadow: 1px 1px 0px #000; }

/* LỖI (ERROR BOX) */
.logexp-error-box {
    margin-top: 15px; background: var(--color-8); color: #fff; border: 3px solid #000;
    padding: 15px; border-radius: 8px; font-weight: 900; font-size: 1.05rem;
    box-shadow: 4px 4px 0px #000; text-align: center; animation: shake 0.3s ease-in-out;
}
@keyframes shake { 0%, 100% { transform: translateX(0); } 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }

/* KẾT QUẢ */
.logexp-result-box {
    margin-top: 20px; border: 3px solid #000; border-radius: 10px; padding: 20px; text-align: center;
    box-shadow: inset 3px 3px 0px rgba(0,0,0,0.05); animation: fadeUp 0.3s ease forwards;
}
.res-equation { font-size: 1.2rem; font-weight: 900; color: #111; margin-bottom: 10px; font-family: 'Courier New', monospace;}
.res-value { font-family: 'Courier New', monospace; font-size: 2rem; font-weight: 900; color: var(--color-8); word-break: break-all; margin-bottom: 15px;}

.logexp-btn-copy { background: #fff; border: 2px solid #000; border-radius: 6px; padding: 8px 15px; font-weight: 900; font-size: 0.95rem; cursor: pointer; box-shadow: 2px 2px 0px #000; transition: 0.1s;}
.logexp-btn-copy:active { transform: translate(2px, 2px); box-shadow: 0px 0px 0px #000; }
.logexp-btn-copy.success { background: var(--color-2); }

/* GHI NHỚ LOGIC */
.logexp-rules-box { border: 3px dashed #000; border-radius: 12px; padding: 20px; box-shadow: 4px 4px 0px #000;}
.logexp-rules-box h4 { margin: 0 0 10px 0; font-size: 1.2rem; font-weight: 900; text-transform: uppercase;}
.logexp-rules-box ul { margin: 0; padding-left: 20px; font-weight: 700; line-height: 1.6; font-size: 1.05rem;}
.logexp-rules-box li { margin-bottom: 8px; }

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

@media (max-width: 768px) {
    .logexp-grid { grid-template-columns: 1fr; }
    .logexp-base-selector { grid-template-columns: 1fr; }
}