* {margin: 0;padding: 0;box-sizing: border-box}
body {font-family: "Pretendard", sans-serif;min-height: 100vh;display: flex;background: #fff;color: #111}

/* ───── Sidebar ───── */
.sidebar {width: 260px;border-right: 1px solid #ddd;padding: 32px 24px;display: flex;flex-direction: column}
.sidebar h2 {font-size: 24px;margin-bottom: 32px}
details.nav {
    margin-bottom: 24px
}

.nav > summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    font-size: 20px
}

.nav > summary::before {
    content: "";
    width: 8px;
    height: 8px;
    margin-right: 8px;
    border-left: 2px solid #111;
    border-bottom: 2px solid #111;
    transform: rotate(-135deg);
    transition: .2s
}

.nav[open] > summary::before {
    transform: rotate(-45deg)
}

.nav-items {
    display: flex;
    flex-direction: column;
    margin-top: 10px;
    padding-left: 16px;
    gap: 6px
}

.nav-items button {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 16px;
    text-align: left;
    padding: 4px 0
}

/* ───── Top-bar ───── */
.topbar {
    height: 68px;
    background: #d9d9d9;
    display: flex;
    align-items: center;
    padding: 0 32px;
    font-size: 28px;
    font-weight: 500;
    box-shadow: 0 2px 4px rgba(0, 0, 0, .15) inset
}

/* ───── Main Board ───── */
.content {
    flex: 1;
    display: flex;
    flex-direction: column
}

.board {
    flex: 1;
    overflow: auto;
    padding: 40px;
    display: flex;
    flex-direction: column;
    gap: 32px
}

.card {
    background: #fff;
    border: 1px solid #e5e5e5;
    box-shadow: 0 2px 4px rgba(0, 0, 0, .15) inset;
    padding: 32px;
    border-radius: 8px
}

.card h3 {
    font-size: 24px;
    margin-bottom: 24px
}

/* SSID rows */
.ssid-row {
    display: grid;
    grid-template-columns:220px 220px 60px 120px;
    gap: 16px;
    margin-bottom: 12px
}

.ssid-row input, .ssid-row select {
    padding: 6px 8px;
    font-size: 16px;
    border: 1px solid #aaa;
    border-radius: 4px;
    width: 100%
}

.icon-button {
    font-size: 10px;
    background-color: #f0f0f0;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.icon-button:hover {
    background-color: #dcdcdc;
}

.icon-button:active {
    background-color: #c0c0c0;
}
/* 3-column grids (Network / Server) */
.grid-3-col {display: grid;grid-template-columns:180px 240px 120px;align-items: center;gap: 16px}
.grid-3-col input {padding: 6px 8px;font-size: 16px;border: 1px solid #aaa;border-radius: 1px;width: 100%}
/* radio */
.radio-group {display: flex;align-items: center;gap: 24px}

.radio-label {display: inline-flex;align-items: center;gap: 4px;cursor: pointer}
.radio-label input {margin: 0}
/* I/O  */
.io-top {display: grid;grid-template-columns:repeat(auto-fit, minmax(360px, 1fr));gap: 40px;margin-bottom: 32px}
.io-bot {display: grid; /* Ethernet·LTE와 같은 2열(가변) 그리드 */grid-template-columns:repeat(auto-fit, minmax(360px, 1fr));gap: 40px;}
.io-group {display: flex;flex-direction: column;gap: 8px}
.io-group h4 {font-size: 20px;font-weight: 600;margin-bottom: 16px;display: flex;align-items: center;gap: 8px}
.io-group h4::before {content: "";width: 8px;height: 8px;background: #aaa;display: inline-block}
.io-fieldset {border: 1px solid #bbb;padding: 24px 32px;border-radius: 4px;display: flex;flex-direction: column;gap: 16px;width: 100%}
.io-row {display: grid;grid-template-columns:120px 12px 1fr;align-items: center;gap: 8px}
.io-row input, .io-row select {padding: 4px 6px;border: 1px solid #aaa;border-radius: 4px;font-size: 14px;width: 50%}
.io-row span.label {font-size: 14px;color: #333;display: block;width: 100%;}
.io-row span.label-inline {font-size: 14px;color: #333;display: inline;width: auto}
.io-row span.colon {font-size: 14px;color: #333;text-align: center;}
.reg-io-grid {display: grid;grid-template-columns: 1fr 1fr;gap: 4px}
.reg-io-grid .io-fieldset .io-row {display: grid;grid-template-columns: 140px 220px;align-items: center;gap: 4px;margin-bottom: 8px;}

/* config 내부 라벨 */
.reg-io-grid .io-fieldset .io-row span.label {font-size: 14px;color: #333;}
.reg-io-grid .io-fieldset .io-row input,
.reg-io-grid .io-fieldset .io-row select {padding: 4px 6px;border: 1px solid #aaa;border-radius: 4px;font-size: 14px;width: 100%;box-sizing: border-box;}
.reg-io-grid .io-fieldset .io-row.checkbox-group {display: flex;align-items: center;gap: 16px;grid-column: 2 / 3;}
.reg-io-grid .io-fieldset .io-row .checkbox-with-text {display: flex;align-items: center;gap: 10px;width: 100%;}
.reg-io-grid .io-fieldset .io-row .checkbox-with-text input[type="checkbox"] {width: auto;margin: 0;}

/* 비활성 input 시각화 */
.disabled {background: #f5f5f5;cursor: not-allowed}
/* Footer Buttons */
.actions {display: flex;gap: 24px;justify-content: center;padding: 20px}
.actions button {min-width: 140px;padding: 10px 18px;font-size: 16px;border: 1px solid #bbb;background: #d9d9d9;border-radius: 4px;cursor: pointer}
.config-actions{display: flex;gap: 24px;justify-content: center;background: #f7f7f7;border: 1px solid #bbb;border-radius: 4px;margin: 24px 0 0 0;padding: 20px 0;}
.config-actions button{min-width:140px;padding:10px 18px;font-size:16px;border:1px solid #bbb;background:#d9d9d9;border-radius:4px;cursor:pointer}
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 32px;
    height: 68px;
    background: #d9d9d9;
    font-size: 28px;
    font-weight: 500;
    box-shadow: 0 2px 4px rgba(0, 0, 0, .15) inset;
}

.save-file {
    font-size: 16px;
    padding: 8px 16px;
    background-color: #4caf50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}
/* MODBUS 화면 심플 스타일 */
#page-modbus .card {background: #f7f7f7;border: 1px solid #bbb;box-shadow: none;padding: 24px;border-radius: 4px;display: flex;flex-direction: column;}
#page-modbus table {width: 100%;border-collapse: collapse;background: #fff;border: 1px solid #bbb;}
#page-modbus th, #page-modbus td {border: 1px solid #bbb;padding: 6px 8px;text-align: left;background: #fff;}
#page-modbus th {background: #e5e5e5;font-weight: 500;}
#page-modbus .modbus-input-area {display: grid;grid-template-columns: 200px 200px 200px 200px;gap: 20px 20px;margin: 24px auto 16px auto;background: #eaeaea;padding: 16px;border-radius: 4px;margin-left: auto;margin-right: auto;}
#page-modbus .input-row {display: contents;}
#page-modbus .modbus-input-area label.nowrap {white-space: nowrap;}
#page-modbus .modbus-input-area label {min-width: auto;color: #444;white-space: normal;}
#page-modbus .modbus-input-area input {background: #e0e0e0;border: none;border-radius: 2px;padding: 4px 8px;min-width: auto;}
#page-modbus .modbus-actions {display: flex;gap: 24px;justify-content: center;margin: 16px 0 0 0;}
#page-modbus .modbus-actions button {background: #d3d3d3;border: 1px solid #aaa;border-radius: 2px;padding: 8px 24px;font-size: 16px;cursor: pointer;}
/* 하단 버튼 영역 */
#modbus-bottom-actions {display: flex;gap: 24px;justify-content: center;background: #f7f7f7;border: 1px solid #bbb;border-radius: 4px;margin: 24px 0 0 0;padding: 20px 0;}
#modbus-bottom-actions button {background: #e0e0e0;border: 1px solid #aaa;border-radius: 2px;padding: 10px 18px;font-size: 16px;min-width: 140px;cursor: pointer;}

/* OPC_UA 화면 */
#page-opcua .card {background: #f7f7f7;border: 1px solid #bbb;box-shadow: none;padding: 24px;border-radius: 4px;display: flex;flex-direction: column;}
#page-opcua table {width: 100%;border-collapse: collapse;background: #fff;border: 1px solid #bbb;}
#page-opcua th, #page-opcua td {border: 1px solid #bbb;padding: 6px 8px;text-align: left;background: #fff;}
#page-opcua th {background: #e5e5e5;font-weight: 500;}
#page-opcua .opcua-input-area {display: grid;grid-template-columns: 200px 200px 200px 200px;gap: 20px 20px;margin: 24px auto 16px auto;background: #eaeaea;padding: 16px;border-radius: 4px;margin-left: auto;margin-right: auto;}
#page-opcua .input-row {display: contents;}
#page-opcua .opcua-input-area label.nowrap {white-space: nowrap;}
#page-opcua .opcua-input-area label {min-width: auto;color: #444;white-space: normal;}
#page-opcua .opcua-input-area input {background: #e0e0e0;border: none;border-radius: 2px;padding: 4px 8px;min-width: auto;}
#page-opcua .opcua-actions {display: flex;gap: 24px;justify-content: center;margin: 16px 0 0 0;}
#page-opcua .opcua-actions button {background: #d3d3d3;border: 1px solid #aaa;border-radius: 2px;padding: 8px 24px;font-size: 16px;cursor: pointer;}
#opcUa-bottom-actions {display: flex;gap: 24px;justify-content: center;background: #f7f7f7;border: 1px solid #bbb;border-radius: 4px;margin: 24px 0 0 0;padding: 20px 0;}
#opcUa-bottom-actions button {background: #e0e0e0;border: 1px solid #aaa;border-radius: 2px;padding: 10px 18px;font-size: 16px;min-width: 140px;cursor: pointer;}

/* CAN 화면 스타일 */
#page-can .card {background: #f7f7f7;border: 1px solid #bbb;box-shadow: none;padding: 24px;border-radius: 4px;display: flex;flex-direction: column;}
#page-can table {width: 100%;border-collapse: collapse;background: #fff;border: 1px solid #bbb;}
#page-can th, #page-can td {border: 1px solid #bbb;padding: 6px 8px;text-align: left;background: #fff;}
#page-can th {background: #e5e5e5;font-weight: 500;}
#page-can .can-input-area {display: grid;grid-template-columns: 200px 200px 200px 200px;gap: 20px 20px;margin: 24px auto 16px auto;background: #eaeaea;padding: 16px;border-radius: 4px;margin-left: auto;margin-right: auto;}
#page-can .input-row {display: contents;}
#page-can .can-input-area label.nowrap {white-space: nowrap;}
#page-can .can-input-area label {min-width: auto;color: #444;white-space: normal;}
#page-can .can-input-area input {background: #e0e0e0;border: none;border-radius: 2px;padding: 4px 8px;min-width: auto;}
#page-can .can-actions {display: flex;gap: 24px;justify-content: center;margin: 16px 0 0 0;}
#page-can .can-actions button {background: #d3d3d3;border: 1px solid #aaa;border-radius: 2px;padding: 8px 24px;font-size: 16px;cursor: pointer;}
#can-bottom-actions {display: flex;gap: 24px;justify-content: center;background: #f7f7f7;border: 1px solid #bbb;border-radius: 4px;margin: 24px 0 0 0;padding: 20px 0;}
#can-bottom-actions button {background: #e0e0e0;border: 1px solid #aaa;border-radius: 2px;padding: 10px 18px;font-size: 16px;min-width: 140px;cursor: pointer;}

.selected-row {background: #d0e6ff !important;}
.selected-row > td {background: #d0e6ff !important;}

.file-upload-section{padding: 10px;margin: 10px;text-align: center;}