:root {
    --color-bg: #f4f6f8;
    --color-surface: #ffffff;
    --color-border: #dde3e8;
    --color-text: #2b2f36;
    --color-text-sub: #6b7280;
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-income: #1d7a46;
    --color-income-bg: #e7f6ee;
    --color-expense: #c1272d;
    --color-expense-bg: #fdecec;
    --color-planned: #b8860b;
    --color-planned-bg: #fff6e0;
    --color-negative-bg: #ffd6d6;
    --color-negative-text: #a10000;
    --radius: 8px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    font-size: 15px;
    line-height: 1.6;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}

/* ヘッダー */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 10;
}
.site-header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}
.site-title {
    font-weight: bold;
    font-size: 18px;
    color: var(--color-text);
}
.site-nav {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 14px;
}
.site-nav a {
    color: var(--color-text-sub);
    padding: 4px 2px;
}
.site-nav a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.site-main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px 16px 60px;
}

h1 {
    font-size: 22px;
    margin: 0 0 16px;
}
h2 {
    font-size: 18px;
    margin: 28px 0 12px;
}

/* カード */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 18px 20px;
    margin-bottom: 20px;
}
.card-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}
.card-row .card {
    flex: 1;
    min-width: 220px;
}

.stat-label {
    font-size: 13px;
    color: var(--color-text-sub);
    margin-bottom: 4px;
}
.stat-value {
    font-size: 28px;
    font-weight: bold;
}
.stat-value.negative {
    color: var(--color-negative-text);
}

.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 14px;
}
.alert-danger {
    background: var(--color-negative-bg);
    color: var(--color-negative-text);
    border: 1px solid #f5b5b5;
}
.alert-success {
    background: var(--color-income-bg);
    color: var(--color-income);
    border: 1px solid #b7e4c7;
}

/* テーブル共通 */
table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-surface);
    font-size: 14px;
}
th, td {
    border: 1px solid var(--color-border);
    padding: 8px 10px;
    text-align: right;
}
th {
    background: #eef1f5;
    font-weight: 600;
    text-align: center;
}
td.label, th.label {
    text-align: left;
}
.table-wrap {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}
.table-wrap table {
    border: none;
}
.table-wrap th, .table-wrap td {
    border: 1px solid var(--color-border);
}

.amount-income { color: var(--color-income); }
.amount-expense { color: var(--color-expense); }

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 12px;
}
.badge-actual {
    background: var(--color-income-bg);
    color: var(--color-income);
}
.badge-planned {
    background: var(--color-planned-bg);
    color: var(--color-planned);
}

/* フォーム */
form.inline-form {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: flex-end;
    margin-bottom: 20px;
}
.form-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.form-group label {
    font-size: 13px;
    color: var(--color-text-sub);
}
input[type="text"],
input[type="number"],
input[type="date"],
input[type="password"],
input[type="month"],
select {
    padding: 7px 10px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 14px;
    background: var(--color-surface);
    color: var(--color-text);
}
.radio-group {
    display: flex;
    gap: 12px;
    align-items: center;
    font-size: 14px;
}

button, .btn {
    padding: 8px 16px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
}
button:hover, .btn:hover {
    background: var(--color-primary-dark);
    text-decoration: none;
}
.btn-danger {
    background: var(--color-expense);
}
.btn-danger:hover {
    background: #9f1f24;
}
.btn-sm {
    padding: 4px 10px;
    font-size: 12px;
}
.btn-secondary {
    background: #6b7280;
}
.btn-secondary:hover {
    background: #52575e;
}

/* カレンダー */
.calendar-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}
.calendar-nav .current-month {
    font-size: 18px;
    font-weight: bold;
}
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
}
.calendar-weekday {
    text-align: center;
    font-size: 12px;
    color: var(--color-text-sub);
    padding-bottom: 4px;
}
.calendar-cell {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    min-height: 92px;
    padding: 6px 8px;
    font-size: 12px;
}
.calendar-cell.empty {
    background: transparent;
    border: none;
}
.calendar-cell.today {
    border: 2px solid var(--color-primary);
}
.calendar-cell.negative {
    background: var(--color-negative-bg);
}
.calendar-date {
    font-weight: bold;
    margin-bottom: 4px;
}
.calendar-income {
    color: var(--color-income);
}
.calendar-expense {
    color: var(--color-expense);
}
.calendar-balance {
    margin-top: 6px;
    font-weight: bold;
}
.calendar-balance.negative {
    color: var(--color-negative-text);
}

/* ログイン画面 */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}
.login-box {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px;
    width: 320px;
    text-align: center;
}
.login-box h1 {
    margin-bottom: 20px;
}
.login-box form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.login-box .error {
    color: var(--color-negative-text);
    font-size: 13px;
}

.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}
.tabs a {
    padding: 8px 16px;
    border-radius: 6px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text-sub);
    font-size: 14px;
}
.tabs a.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.text-sub {
    color: var(--color-text-sub);
    font-size: 13px;
}

@media (max-width: 640px) {
    .calendar-cell {
        min-height: 70px;
        font-size: 10px;
    }
}