/* ==========================================================
   共通スタイル(スマートフォン優先・タップ操作最適化)
   ========================================================== */

:root {
    --color-primary: #2f6fed;
    --color-primary-dark: #1f4fbb;
    --color-danger: #e0453c;
    --color-bg: #f5f6fa;
    --color-text: #222831;
    --color-border: #d9dce3;
    --tap-min-size: 44px; /* タップ操作に最適なボタン最小サイズ */
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
}

.app-container {
    max-width: 480px;
    margin: 0 auto;
    padding: 16px;
    min-height: 100vh;
}

h1 {
    font-size: 1.3rem;
    margin: 8px 0 20px;
    text-align: center;
}

/* ---------- フォーム ---------- */
.form-group {
    margin-bottom: 16px;
}

label {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 6px;
    color: #555;
}

input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"] {
    width: 100%;
    padding: 12px;
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    min-height: var(--tap-min-size);
}

input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.field-error {
    color: var(--color-danger);
    font-size: 0.85rem;
    margin-top: 4px;
}

.alert {
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 0.9rem;
}

.alert-error {
    background: #fdecea;
    color: var(--color-danger);
    border: 1px solid #f5c6c3;
}

.alert-success {
    background: #e9f7ef;
    color: #1e7a3c;
    border: 1px solid #b9e6c9;
}

/* ---------- ボタン ---------- */
.btn {
    display: block;
    width: 100%;
    min-height: var(--tap-min-size);
    padding: 12px;
    font-size: 1rem;
    border-radius: 8px;
    border: none;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    margin-bottom: 12px;
    touch-action: manipulation; /* タップ時の遅延・拡大を防止 */
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}

.btn-primary:active {
    background: var(--color-primary-dark);
}

.btn-secondary {
    background: #fff;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-link {
    background: transparent;
    color: var(--color-primary);
    text-decoration: underline;
}

.btn:disabled {
    background: #c9ccd3;
    color: #fff;
    cursor: not-allowed;
}

.btn-group-vertical .btn {
    max-width: 320px;
    margin-left: auto;
    margin-right: auto;
}

/* ---------- 数量ステッパー ---------- */
.qty-stepper {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 6px;
}

.qty-btn {
    width: var(--tap-min-size);
    height: var(--tap-min-size);
    font-size: 1.2rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    background: #fff;
    touch-action: manipulation;
}

.qty-input {
    width: 56px;
    text-align: center;
    min-height: var(--tap-min-size);
    padding: 4px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
}

/* ---------- テーブル ---------- */
table.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

table.data-table th,
table.data-table td {
    padding: 10px 6px;
    border-bottom: 1px solid var(--color-border);
    text-align: left;
    vertical-align: middle;
}

/* ---------- トグルスイッチ ---------- */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #ccc;
    transition: .2s;
    border-radius: 26px;
}

.toggle-slider::before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .2s;
    border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
    background-color: var(--color-primary);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(18px);
}

/* ---------- モーダル(共通部品) ---------- */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 16px;
}

.modal-overlay.active {
    display: flex;
}

.modal-box {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    width: 100%;
    max-width: 320px;
    text-align: center;
}

.modal-message {
    margin-bottom: 20px;
    font-size: 1rem;
}

.modal-buttons {
    display: flex;
    gap: 8px;
}

.modal-buttons .btn {
    margin-bottom: 0;
}

/* ---------- 合計金額表示 ---------- */
.payment-summary {
    background: #fff;
    border-radius: 8px;
    padding: 16px;
    margin: 16px 0;
    text-align: center;
    border: 1px solid var(--color-border);
}

.payment-summary .amount {
    font-size: 1.6rem;
    font-weight: bold;
    color: var(--color-primary);
}