:root {
    --color-bg: #f5f6f8;
    --color-surface: #ffffff;
    --color-border: #e2e5ea;
    --color-text: #1f2430;
    --color-text-muted: #6b7280;
    --color-primary: #4353ff;
    --color-primary-hover: #3341d6;
    --color-danger: #d3455b;
    --color-danger-bg: #fdecef;
    --color-success: #1f9d55;
    --radius: 8px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.6;
}

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

a:hover {
    text-decoration: underline;
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.app-header .brand {
    font-weight: 700;
    font-size: 16px;
    color: var(--color-text);
}

.app-header nav {
    display: flex;
    gap: 16px;
    align-items: center;
}

.app-main {
    max-width: 960px;
    margin: 32px auto;
    padding: 0 24px;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 24px;
}

.card h2 {
    margin-top: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
    font-size: 14px;
    text-decoration: none;
}

.btn:hover {
    background: var(--color-bg);
    text-decoration: none;
}

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

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

.btn-danger {
    color: var(--color-danger);
    border-color: var(--color-danger);
}

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

.btn-sm {
    padding: 4px 10px;
    font-size: 13px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 4px;
}

.form-group .help {
    color: var(--color-text-muted);
    font-size: 12px;
    margin-top: 4px;
}

input[type="text"],
input[type="email"],
input[type="number"],
input[type="search"],
input[type="password"],
select,
textarea {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 14px;
    background: var(--color-surface);
    color: var(--color-text);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

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

table th,
table td {
    text-align: left;
    padding: 8px 12px;
    border-bottom: 1px solid var(--color-border);
}

.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
}

.alert-error {
    background: var(--color-danger-bg);
    color: var(--color-danger);
}

.alert-success {
    background: #eafaf1;
    color: var(--color-success);
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}

.badge-pending {
    background: #fef3c7;
    color: #92400e;
}

.badge-sent {
    background: #d1fae5;
    color: #065f46;
}

.badge-failed {
    background: var(--color-danger-bg);
    color: var(--color-danger);
}

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

.row {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.row > * {
    flex: 1;
}

.login-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 40px;
    width: 360px;
    text-align: center;
}

.google-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
    width: 100%;
    padding: 10px 16px;
    border-radius: var(--radius);
    border: 1px solid var(--color-primary);
    background: var(--color-primary);
    color: #fff;
    font-weight: 600;
    margin-top: 24px;
}

.google-btn:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    text-decoration: none;
}