:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-danger: #dc2626;
    --color-text: #1f2937;
    --color-border: #e5e7eb;
    --color-bg-muted: #f9fafb;
}

* {
    box-sizing: border-box;
}

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

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

a:hover {
    text-decoration: underline;
}

.site-header {
    border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.site-header__logo {
    font-weight: bold;
    font-size: 1.2rem;
    color: var(--color-text);
    text-decoration: none;
}

.site-header__nav a {
    margin-left: 16px;
    color: var(--color-text);
}

.site-main {
    max-width: 960px;
    margin: 0 auto;
    padding: 24px 20px 60px;
}

.site-footer {
    text-align: center;
    padding: 20px;
    color: #6b7280;
    font-size: 0.85rem;
}

.flash {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.flash--success {
    background: #dcfce7;
    color: #166534;
}

.flash--error {
    background: #fee2e2;
    color: #991b1b;
}

.flash--info {
    background: #e0f2fe;
    color: #075985;
}

.error-list {
    background: #fee2e2;
    color: #991b1b;
    padding: 12px 24px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.form {
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-width: 480px;
}

.form label {
    font-weight: bold;
    margin-top: 10px;
}

.form input[type="text"],
.form input[type="email"],
.form input[type="password"],
.form textarea {
    padding: 10px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 1rem;
    width: 100%;
}

.problem-fieldset {
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 12px 16px;
    margin-top: 16px;
}

.btn {
    display: inline-block;
    padding: 10px 18px;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    background: #fff;
    color: var(--color-text);
    cursor: pointer;
    font-size: 0.95rem;
    text-decoration: none;
    margin-top: 16px;
}

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

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

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

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

.btn--small {
    padding: 4px 10px;
    margin-top: 0;
    font-size: 0.85rem;
}

.inline-form {
    display: inline;
}

.list-page__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

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

.table th {
    background: var(--color-bg-muted);
    width: 180px;
}

.table__actions a,
.table__actions button {
    margin-right: 8px;
}

.category-filter {
    margin: 16px 0;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.category-filter a {
    padding: 6px 14px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    color: var(--color-text);
}

.category-filter a.is-active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.hero {
    text-align: center;
    padding: 40px 0;
}

.hero__actions {
    margin-top: 24px;
    display: flex;
    gap: 12px;
    justify-content: center;
}

.typing-stats {
    display: flex;
    gap: 24px;
    margin: 16px 0;
    font-weight: bold;
}

.typing-target {
    font-size: 1.4rem;
    line-height: 2;
    padding: 20px;
    background: var(--color-bg-muted);
    border-radius: 8px;
    letter-spacing: 1px;
    font-family: "SFMono-Regular", Consolas, monospace;
    min-height: 4em;
}

.typing-target .pending {
    color: #9ca3af;
}

.typing-target .correct {
    color: #16a34a;
}

.typing-target .incorrect {
    color: #dc2626;
    text-decoration: underline;
}

.typing-input {
    width: 100%;
    padding: 14px;
    font-size: 1.2rem;
    margin-top: 16px;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    font-family: "SFMono-Regular", Consolas, monospace;
}

.typing-input:disabled {
    background: var(--color-bg-muted);
}

.result-area {
    margin-top: 24px;
}

.result-note {
    color: #6b7280;
    font-size: 0.9rem;
}