/* =========================================
   変数定義 (カラーパレット、サイズなど)
   ========================================= */
:root {
    --primary-bg: #f4f6f8;
    --text-color: #1a2533;
    --header-bg: #ffffff;
    --border-color: #9a9fa8;
    --button-bg: #2c7be5;
    --button-hover-bg: #1a68d1;
    --danger-button-bg: #e53e3e;
    --danger-button-hover-bg: #c53030;
    --table-header-bg: #e9edf2;
    --selected-row-bg: #d4e6ff;
    --fixed-point-bg: #fddddd;
    --moving-point-bg: #dff9e6;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --font-size-base: 16px;
    --font-size-large: 18px;
}

/* =========================================
   基本スタイル (リセット、body設定)
   ========================================= */
html {
    box-sizing: border-box;
}

*, *:before, *:after {
    box-sizing: inherit;
}

body {
    margin: auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: var(--font-size-base);
    background-color: var(--primary-bg);
    color: var(--text-color);
    line-height: 1.6;
    max-width: 1280px;
}

/* =========================================
   ヘッダー
   ========================================= */
header {
    background-color: var(--header-bg);
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 4px var(--shadow-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

header h1 {
    margin: 0;
    font-size: var(--font-size-large);
    white-space: nowrap;
}

h2 {
    margin-top: 0;
    margin-bottom: 0rem;

}
header p {
    font-size: 14px;
    color: #ff4f4f;
    margin: 0px 5px;

}

.file-input-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.file-label {
    display: inline-block;
    padding: 10px 15px;
    background-color: var(--button-bg);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
    box-shadow: 0 2px 5px var(--shadow-color);
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.file-label:hover {
    background-color: var(--button-hover-bg);
}

#csv-file-input {
    display: none;
}

#file-name-display {
    font-size: 14px;
    color: #555;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
}

/* =========================================
   メインレイアウト (コンテナ設定)
   ========================================= */
main {
    padding: 1.5rem;
}

.container {
    display: flex;
    gap: 1.5rem;
}

.controls-container {
    width: 320px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.display-container {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    min-width: 0;
}

.control-section {
    background-color: var(--header-bg);
    padding: 1rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-color);
}

.control-section h2, .control-section h3, .control-section h4 {
    margin-top: 0;
    margin-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.control-group {
    margin-bottom: 1rem;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}
.control-group:last-child {
    margin-bottom: 0;
}

.control-section-fl {
    display: flex;
    flex-direction: row;
    gap: 10px;
    flex-wrap: wrap;
}

.control-section-fl .control-button {
    margin-top: 0;
    width: auto;
    flex: 1;
}

.radio-group {
    margin-bottom: 0.75rem;
    display: flex;
    flex-direction: column;
}

.select-group, .input-group {
    margin-bottom: 0.75rem;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 10px;
}



.select-group label, .input-group label {
    margin-bottom: 0;
    margin-right: 5px;
    font-weight: 500;
    white-space: nowrap;
}

.select-group select, .input-group input {
    width: auto;
    flex: 1;
}

select, input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: var(--font-size-base);
    min-height: 44px;
}

.radio-group {
    flex-direction: row;
    gap: 0.2rem;
    align-items: center;
}

.control-button {
    width: 100%;
    padding: 0px 15px;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: white;
    background-color: var(--button-bg);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
    box-shadow: 0 2px 5px var(--shadow-color);
    min-height: 44px;
    margin-top: 0.5rem;
}

.control-button:hover {
    background-color: var(--button-hover-bg);
}

.control-button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    box-shadow: none;
}

.danger-button {
    background-color: var(--danger-button-bg);
}
.danger-button:hover {
    background-color: var(--danger-button-hover-bg);
}

#info-display p {
    margin-top: 0;
}
#distance-output {
    background-color: var(--primary-bg);
    padding: 10px;
    border-radius: 8px;
    font-size: 15px;
}

/* =========================================
   Canvas (グラフ描画エリア)
   ========================================= */
.canvas-wrapper {
    position: relative;
    width: 100%;
    padding-top: 75%; /* Aspect ratio 4:3 */
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-color);
    overflow: hidden;
}

#coordinate-graph {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: crosshair;
}

#coordinate-graph.grabbing {
    cursor: grabbing;
}

#tooltip {
    position: absolute;
    display: none;
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
    pointer-events: none;
    white-space: nowrap;
    z-index: 100;
}

/* =========================================
   テーブル
   ========================================= */
.table-wrapper {
    width: 100%;
    overflow-x: auto;
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-color);
}

#coordinate-table {
    width: 100%;
    border-collapse: collapse;
}

#coordinate-table th, #coordinate-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

#coordinate-table thead th {
    background-color: var(--table-header-bg);
    font-weight: 600;
    position: sticky;
    top: 0;
}

#coordinate-table tbody tr {
    cursor: pointer;
    transition: background-color 0.2s;
}

#coordinate-table tbody tr:hover {
    background-color: #f0f4f8;
}

#coordinate-table tbody tr.selected {
    background-color: var(--selected-row-bg);
    font-weight: bold;
}
#coordinate-table tbody tr.fixed-point-row {
    background-color: var(--fixed-point-bg);
    font-weight: bold;
}
#coordinate-table tbody tr.moving-point-row {
    background-color: var(--moving-point-bg);
    font-weight: bold;
}
.radioItem {
    display: inline-flex;
    align-items: center;
    column-gap: 2px;
    line-height: 1;
    cursor: pointer;
}

.radioItem:not(:last-of-type) {
    margin-right: 6px;
}

.radioButton {
    appearance: none;
    position: relative;
    width: 15px;
    height: 15px;
    border: 1px solid #2c7be5;
    border-radius: 9999px;
    cursor: pointer;
}

.radioButton:checked::after {
    content: "";
    position: absolute;
    inset: 0;
    width: 15px;
    height: 15px;
    margin: auto;
    border-radius: 9999px;
    background-color: #2c7be5;
}

.fl {
    padding:6px 5px;
    margin-bottom: 7px;
    border-radius: 12px;
    display: flex;
    border-bottom: #bbb3b3 solid 1px;   
    box-shadow: 1px 3px 9px 1px rgba(20, 20, 20, 0.3);
    justify-content: space-between;
    align-items: center;
}

.fl h4 {
    margin: 0;
    padding: 0;
    border: none;
}

.fl .control-button {
    width: 50%;
    margin-top: 0;
}

/* =========================================
   レスポンシブデザイン (スマートフォン向け)
   ========================================= */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        padding: 5px 5px;
    }
    
    .file-input-container {
        width: 100%;
    }

    #file-name-display {
        flex-grow: 1;
    }

    main {
        padding: 0.5rem;
    }

    .container {
        flex-direction: column;
    }

    .controls-container {
        width: 100%;
        gap: 0rem;
    }

    .canvas-wrapper {
        padding-top: 100%; /* 1:1 aspect ratio on mobile */
    }

    .control-section {
    margin-top: 10px;
    padding: 10px 0px;
    }

    .control-section h4 {
    width: 50%;
    padding-bottom: 0px;
    align-items: center;
    border-bottom: 0px;
    }

    .control-button {
        width: 50%;
        font-size: 14px;
        padding: 0px 5px;
        margin: 0px 5px;
    }

    #info-display {
    padding-left: 15px;
    }

    .select-group {
    margin: 0px;
    padding-bottom: 6px;
    flex-direction: row;
    }
    
    .select-group label {
        width: 30%;
    }
    
    .input-group {
        margin: 0px;
        padding-bottom: 6px;
        flex-direction: row;
    }

    .input-group label {
        width: 30%;
    }

    .control-section-fl {
        display: flex;
        flex-direction: row;
    }

    #coordinate-table th {
        padding: 8px 8px;
        z-index: 1;
    }

    #coordinate-table td {
        padding: 8px 8px;
    }

    .table-wrapper {
        padding-bottom: 20px;
        max-height: 70vh;
        overflow-y: auto;
    }
.control-section {
    padding: 10px 5px;
    border-radius: 12px;
    }

.radioItem {
    margin-right: 12px;
    font-size: 14px;
}
.radioItem:not(:last-of-type) {
    margin-right: 12px;
}
.radioButton {
    appearance: none;
    position: relative;
    width: 18px;
    height: 18px;
    border: 1px solid #2c7be5;
    border-radius: 9999px;
    cursor: pointer;
    }

.radioButton:checked::after {
    content: "";
    position: absolute;
    inset: 0;
    width: 18px;
    height:18px;
    margin: auto;
    border-radius: 9999px;
    background-color: #2c7be5;
    }


}

#coordinate-table th, #coordinate-table td {
    border-left: 1px solid var(--border-color);
}

#coordinate-table th:first-child, #coordinate-table td:first-child {
    border-left: none;
}

#coordinate-table td:nth-child(n+2) {
    text-align: right;
}

/* =========================================
   ページトップボタン
   ========================================= */
.scroll-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
    background-color: rgba(0, 0, 0, 0.5);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    z-index: 1000;
    display: none; /* デフォルトは非表示 */
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s, opacity 0.3s;
    opacity: 0; /* JSで表示切り替え時にフェードインさせるため */
    pointer-events: none; /* 非表示時はクリック不可 */
}

.scroll-to-top.visible {
    display: flex;
    opacity: 1;
    pointer-events: auto;
}

.scroll-to-top:hover {
    background-color: rgba(0, 0, 0, 0.7);
}