/* 基本設定 */
:root {
    --bg: #f4f7f6;
    --text: #333;
    --surface: #fff;
    --surface-border: #ddd;
    --muted-text: #666;
    --input-bg: #fff;
    --input-border: #ccc;
    --shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    --danger-surface: #fff8f9;
    --danger-border: #f0b8c0;
    --danger-text: #8a1f2f;
    --table-border: #eee;
    --table-head-bg: #f8f9fa;
    --table-head-text: #666;
    --lent-text: #007bff;
    --borrowed-text: #dc3545;
    --divider: #eee;
}

html[data-theme="dark"] {
    --bg: #10161e;
    --text: #d9e1ea;
    --surface: #17212c;
    --surface-border: #223142;
    --muted-text: #9fb0c1;
    --input-bg: #0f1822;
    --input-border: #304357;
    --shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
    --danger-surface: #2a1219;
    --danger-border: #66303a;
    --danger-text: #f0b4be;
    --table-border: #2c3e50;
    --table-head-bg: #1c2a38;
    --table-head-text: #b8c8d9;
    --lent-text: #64a8ff;
    --borrowed-text: #ff8b99;
    --divider: #304357;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    padding: 20px 10px;
}

.container,
.card,
.box {
    max-width: 600px;
    margin: 0 auto 20px;
    background: var(--surface);
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    border: 1px solid var(--surface-border);
}

h1,
h2,
h3 {
    margin-bottom: 20px;
    text-align: center;
}

/* フォーム要素 */
label {
    font-weight: bold;
    display: block;
    margin-top: 15px;
}

select,
input {
    width: 100%;
    padding: 12px;
    margin-top: 5px;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text);
    border-radius: 5px;
    font-size: 16px;
}

input[type="password"] {
    letter-spacing: 0.08em;
    -webkit-text-security: disc;
}

.password-field {
    position: relative;
    margin-top: 5px;
}

.password-field .password-input {
    margin-top: 0;
    padding-right: 46px;
}

.password-field .btn-pass-toggle {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 30px;
    height: 30px;
    min-width: 30px;
    margin: 0;
    padding: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--muted-text);
    border: none;
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
}

.password-field .btn-pass-toggle:hover {
    color: var(--text);
    background: rgba(127, 140, 156, 0.2);
}

.error-text {
    color: #c82333;
    font-weight: bold;
    margin-bottom: 10px;
}

.success-text {
    color: #1c7c35;
    font-weight: bold;
    text-align: center;
    margin-bottom: 12px;
}

.remember-label {
    margin-top: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: normal;
    cursor: pointer;
}

.remember-label input[type="checkbox"] {
    width: auto;
    margin-top: 0;
    transform: scale(1.1);
}

/* ボタン */
button,
.btn-main {
    width: 100%;
    padding: 15px;
    margin: 10px 0;
    font-size: 16px;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    color: white;
    display: block;
    text-align: center;
    text-decoration: none;
}

.btn-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 20px;
}

.btn-grid button {
    margin: 0;
}

.btn-input {
    background-color: #007bff;
}

.btn-history {
    background-color: #6c757d;
}

.btn-friend-add {
    background-color: #0b7285;
}

.btn-friend-manage {
    background-color: #495057;
}

.btn-user-manage {
    background-color: #5f3dc4;
}

.btn-back {
    background-color: #6c757d;
}

.btn-lent {
    background-color: #007bff;
}

.btn-borrowed {
    background-color: #dc3545;
}

.btn-return {
    background-color: #28a745;
}

.btn-copy {
    background-color: #f8f9fa;
    color: #333;
    border: 1px solid #ccc;
    padding: 10px;
    width: auto;
    display: inline-block;
}

.btn-nav {
    width: 100%;
    padding: 14px;
    margin: 0;
    font-size: 16px;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    color: white;
    display: block;
    text-align: center;
    text-decoration: none;
}

.btn-inline {
    display: inline-block;
    padding: 8px 10px;
    border-radius: 6px;
    color: white;
    font-size: 13px;
    text-decoration: none;
    margin-right: 6px;
}

.btn-inline-light {
    background-color: #4f46e5;
}

.btn-inline-danger {
    background-color: #b42339;
}

/* テーブル */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

th,
td {
    border-bottom: 1px solid var(--table-border);
    padding: 12px 10px;
    text-align: left;
}

th {
    background-color: var(--table-head-bg);
    font-size: 14px;
    color: var(--table-head-text);
}

.amt-lent {
    color: var(--lent-text);
    font-weight: bold;
}

.amt-borrowed {
    color: var(--borrowed-text);
    font-weight: bold;
}

.amt-zero {
    color: #28a745;
}

/* 通知・その他 */
.warning-box {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    padding: 15px;
    border-radius: 5px;
    color: #721c24;
    margin-bottom: 20px;
}

.warning-text {
    color: #9a6700;
    font-size: 13px;
    margin-top: 8px;
}

.copy-section {
    text-align: center;
    margin-top: 40px;
}

.settings-card {
    margin-bottom: 16px;
}

.settings-user-name {
    text-align: center;
    margin-bottom: 12px;
}

.settings-meta-note {
    font-size: 13px;
    color: var(--muted-text);
    margin-bottom: 8px;
}

.settings-danger-note {
    font-size: 13px;
    color: var(--danger-text);
    margin-bottom: 8px;
}

.friend-code {
    font-size: 28px;
    font-weight: bold;
    letter-spacing: 0.08em;
    text-align: center;
    color: #0b7285;
    margin: 10px 0;
}

.theme-setting label {
    margin-top: 0;
}

.theme-setting .theme-help {
    margin-top: 10px;
    font-size: 13px;
    color: var(--muted-text);
}

.qr-title {
    margin-top: 18px;
    margin-bottom: 10px;
}

.qr-wrap {
    text-align: center;
    margin: 0 auto;
    width: fit-content;
    padding: 10px;
    border-radius: 14px;
    background: linear-gradient(180deg, #f8fbfc 0%, #eef6f8 100%);
    border: 1px solid #dbe9ed;
}

.qr-image {
    width: 180px;
    max-width: 100%;
    height: auto;
    border: 1px solid #dbe3e6;
    border-radius: 10px;
    padding: 6px;
    background: #fff;
}

.qr-caption {
    font-size: 13px;
    color: #666;
    margin-top: 10px;
    text-align: center;
}

.copy-msg {
    font-size: 13px;
    color: #1c7c35;
    text-align: center;
    margin-top: 8px;
}

.confirm-text {
    text-align: center;
    font-size: 18px;
    font-weight: bold;
    color: #334155;
    margin-bottom: 14px;
}

.terms-text {
    white-space: normal;
    line-height: 1.8;
    color: var(--text);
    font-size: 14px;
}

.danger-zone {
    border: 1px solid var(--danger-border);
    background: var(--danger-surface);
}

.btn-danger {
    background-color: #b42339;
}

.btn-danger:hover {
    background-color: #911c2e;
}

.logout-link {
    display: block;
    margin-top: 20px;
    color: var(--muted-text);
    text-decoration: none;
    font-size: 14px;
}

.muted-text {
    color: var(--muted-text);
}

.inline-button-reset {
    border: none;
    cursor: pointer;
}

.btn-danger-compact {
    padding: 8px 10px;
    margin: 0;
    width: auto;
}

.summary-label {
    font-size: 14px;
    color: var(--muted-text);
}

.summary-balance {
    font-size: 32px;
}

.summary-divider {
    border: none;
    border-top: 1px solid var(--divider);
    margin: 15px 0;
}

.status-line {
    margin-bottom: 5px;
}