/* ベーススタイル */
:root {
    --bg: #f5f7fb;
    --panel: #ffffff;
    --panel-muted: #f9fafc;
    --border: #e5e7eb;
    --border-strong: #d2d6dc;
    --text: #0f172a;
    --text-muted: #6b7280;
    --accent: #2563eb;
    --accent-soft: #dbeafe;
    --accent-strong: #1d4ed8;
    --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.08);
}

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

body {
    margin: 0;
    font-family: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding: 32px;
}

a {
    color: inherit;
}

.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--bg);
}

.container {
    max-width: 1280px;
    margin: 0 auto 48px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 40px;
    box-shadow: var(--shadow-soft);
}

/* ヘッダー */
header {
    margin-bottom: 40px;
}

.header-row {
    display: flex;
    justify-content: space-between;
    gap: 32px;
    align-items: flex-start;
}

.header-copy h1 {
    margin: 4px 0 8px;
    font-size: clamp(1.6rem, 3vw, 2.3rem);
    color: var(--text);
    font-weight: 700;
}

.header-eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.25em;
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.header-subtitle {
    color: var(--text-muted);
    line-height: 1.6;
    margin: 0;
    max-width: 520px;
}

.user-info {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--panel-muted);
    color: var(--text);
}

.btn-primary,
.btn-ghost {
    border: none;
    font-weight: 600;
    cursor: pointer;
    border-radius: 999px;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn-primary {
    padding: 12px 28px;
    background: linear-gradient(135deg, #60a5fa 0%, #2563eb 100%);
    color: #fff;
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.22);
}

.btn-primary:hover {
    transform: translateY(-1px);
}

.btn-ghost {
    padding: 10px 22px;
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    background: var(--panel-muted);
}

.header-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin: 24px 0 32px;
}

.header-links a {
    padding: 10px 18px;
    border-radius: 999px;
    border: 1px solid transparent;
    background: var(--panel-muted);
    color: var(--text);
    font-size: 0.92rem;
    font-weight: 600;
}

.header-links a:hover {
    background: #edf2ff;
}

.header-links a.active {
    background: var(--accent-soft);
    border-color: #93c5fd;
    color: var(--accent);
}

/* フィルター */
.date-filter {
    background: var(--panel-muted);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 20px 24px;
}

.filter-heading {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: center;
    margin-bottom: 16px;
}

.filter-eyebrow {
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin: 0 0 6px;
}

.filter-hint {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.date-filter form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    align-items: end;
}

.date-filter label {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.date-filter input[type="date"] {
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text);
    font-size: 0.95rem;
}

.filter-actions {
    display: flex;
    justify-content: flex-end;
}

/* セクション */
.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 30px 32px;
    margin-bottom: 32px;
    box-shadow: var(--shadow-soft);
}

.section-header {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.section-eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin: 0 0 10px;
}

.section-header h2 {
    margin: 0;
    font-size: 1.4rem;
    color: var(--text);
}

.section-description {
    margin: 0;
    max-width: 360px;
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* 統計カード */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 18px;
}

.stat-card {
    padding: 20px;
    border-radius: 20px;
    border: 1px solid var(--border);
    background: var(--panel-muted);
    display: flex;
    gap: 16px;
    align-items: center;
    transition: transform 0.25s ease, border-color 0.25s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-strong);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: var(--accent-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
}

.stat-label {
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin: 0 0 6px;
}

.stat-value {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.stat-description {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* グラフ */
.chart-panel .chart-container {
    height: 360px;
}

.chart-container {
    position: relative;
}

canvas {
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--border);
}

/* テーブル */
.stats-table {
    width: 100%;
    border-collapse: collapse;
    border-radius: 18px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.stats-table thead {
    background: var(--panel-muted);
}

.stats-table th,
.stats-table td {
    padding: 16px 20px;
    text-align: left;
    font-size: 0.95rem;
}

.stats-table th {
    color: var(--text);
    font-weight: 600;
}

.stats-table tbody tr {
    background: #fff;
    border-bottom: 1px solid var(--border);
}

.stats-table tbody tr:hover {
    background: var(--panel-muted);
}

.no-data {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

/* ログイン画面 */
.login-container {
    width: 100%;
    max-width: 420px;
    padding: 40px 36px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--border);
    color: var(--text);
    box-shadow: var(--shadow-soft);
}

.login-card {
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.login-card h1 {
    margin: 0;
    color: var(--text);
}

.login-description {
    margin: 0;
    color: var(--text-muted);
    line-height: 1.6;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 600;
    color: var(--text);
}

.form-group input {
    padding: 12px 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text);
}

.form-help {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.login-footer {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.login-footer a {
    color: var(--accent);
    text-decoration: none;
}

/* アラート */
.alert {
    padding: 14px 18px;
    border-radius: 12px;
    margin-bottom: 18px;
    font-size: 0.92rem;
    line-height: 1.5;
}

.alert-error {
    background: #fee2e2;
    border: 1px solid #fecaca;
    color: #b91c1c;
}

.alert-success {
    background: #dcfce7;
    border: 1px solid #bbf7d0;
    color: #15803d;
}

.alert-warning {
    background: #fef9c3;
    border: 1px solid #fde68a;
    color: #a16207;
}

.alert-info {
    background: #dbeafe;
    border: 1px solid #bfdbfe;
    color: #1d4ed8;
}

/* レスポンシブ */
@media (max-width: 960px) {
    body {
        padding: 24px;
    }

    .container {
        padding: 32px 24px;
    }

    .header-row {
        flex-direction: column;
    }

    .user-info {
        width: 100%;
        justify-content: space-between;
    }

    .section-header {
        flex-direction: column;
    }

    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

@media (max-width: 600px) {
    body {
        padding: 16px;
    }

    .container {
        padding: 24px 18px;
    }

    .date-filter form {
        grid-template-columns: 1fr;
    }

    .chart-panel .chart-container {
        height: 280px;
    }

    .user-info {
        flex-direction: column;
        align-items: flex-start;
    }
}