:root {
    --bg: #f6f7f9;
    --surface: #ffffff;
    --border: #dfe3e8;
    --text: #1f2430;
    --text-muted: #6b7280;
    --primary: #3457d5;
    --primary-hover: #2a46b3;
    --danger: #c0392b;
    --success: #1e8e3e;
    color-scheme: light;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

h1:focus {
    outline: none;
}

a {
    color: var(--primary);
}

button {
    font: inherit;
    cursor: pointer;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 0.5rem 1rem;
}

    button:hover:not(:disabled) {
        background: var(--primary-hover);
    }

    button:disabled {
        opacity: 0.5;
        cursor: default;
    }

.link-button {
    background: none;
    color: var(--primary);
    padding: 0.25rem 0.4rem;
}

    .link-button:hover:not(:disabled) {
        background: rgba(52, 87, 213, 0.08);
    }

    .link-button.danger {
        color: var(--danger);
    }

        .link-button.danger:hover:not(:disabled) {
            background: rgba(192, 57, 43, 0.08);
        }

input, select {
    font: inherit;
    padding: 0.4rem 0.55rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    width: 100%;
}

label {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.error {
    color: var(--danger);
    white-space: pre-wrap;
}

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

/* Layout */
.page {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.top-bar {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.brand {
    font-weight: 700;
    font-size: 1.1rem;
    text-decoration: none;
    color: var(--text);
}

.top-nav {
    display: flex;
    gap: 1rem;
    flex: 1;
}

    .top-nav a {
        text-decoration: none;
        color: var(--text-muted);
        padding: 0.25rem 0;
        border-bottom: 2px solid transparent;
    }

        .top-nav a.active {
            color: var(--text);
            border-bottom-color: var(--primary);
        }

main {
    flex: 1;
    padding: 1.5rem;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

.toolbar {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

/* Auth page */
.auth-card {
    max-width: 380px;
    margin: 3rem auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.5rem;
}

.tabs {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1.25rem;
}

.tab {
    flex: 1;
    background: none;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border);
    border-radius: 0;
    padding: 0.5rem;
}

    .tab.active {
        color: var(--text);
        border-bottom-color: var(--primary);
    }

.auth-form button[type="submit"] {
    width: 100%;
    margin-top: 0.25rem;
}

/* Words page */
.page-grid {
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 1.5rem;
    align-items: start;
}

.list-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1rem;
}

.side-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.panel-block {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1rem;
}

    .panel-block h3 {
        margin-top: 0;
    }

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

    .data-table th {
        text-align: left;
        font-size: 0.8rem;
        color: var(--text-muted);
        border-bottom: 1px solid var(--border);
        padding: 0.5rem;
    }

    .data-table td {
        padding: 0.5rem;
        border-bottom: 1px solid var(--border);
    }

    .data-table tbody tr {
        cursor: pointer;
    }

        .data-table tbody tr:hover {
            background: rgba(52, 87, 213, 0.05);
        }

        .data-table tbody tr.selected {
            background: rgba(52, 87, 213, 0.12);
        }

/* Training */
.training-grid {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: 1.5rem;
    align-items: start;
}

.history {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1rem;
}

.history-item {
    padding: 0.4rem 0.5rem;
    border-radius: 6px;
    font-size: 0.9rem;
}

    .history-item.correct {
        color: var(--success);
    }

    .history-item.wrong {
        color: var(--danger);
    }

.question {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 2rem;
    text-align: center;
}

    .question h1 {
        font-size: 2.5rem;
        margin: 0 0 1.5rem;
    }

.variants {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    max-width: 500px;
    margin: 0 auto 1.5rem;
}

.variant {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 1rem;
    border-radius: 8px;
    font-size: 1.05rem;
}

    .variant:hover:not(:disabled) {
        border-color: var(--primary);
        background: var(--surface);
    }

    .variant.correct {
        background: rgba(30, 142, 62, 0.12);
        border-color: var(--success);
        color: var(--success);
    }

    .variant.wrong {
        background: rgba(192, 57, 43, 0.12);
        border-color: var(--danger);
        color: var(--danger);
    }

.actions {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
}

/* Framework defaults kept from the scaffolded template */
.valid.modified:not([type=checkbox]) {
    outline: 1px solid #26b050;
}

.invalid {
    outline: 1px solid #e50000;
}

.validation-message {
    color: #e50000;
}

.blazor-error-boundary {
    background: url(data:image/svg+xml;base64,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) no-repeat 1rem/1.8rem, #b32121;
    padding: 1rem 1rem 1rem 3.7rem;
    color: white;
}

    .blazor-error-boundary::after {
        content: "An error has occurred.";
    }

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