.chess-clock-container {
    width: 100%;
    max-width: var(--app-container-max);
    margin: 0 auto;
}

.chess-clock {
    position: relative;
    margin: 0 auto var(--space-8);
    padding: var(--space-6);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.chess-clock__intro {
    margin: 0 0 var(--space-4);
    color: var(--color-text-muted);
    text-align: center;
}

.chess-clock__notice,
.chess-clock__status,
.chess-clock__flag-announcement,
.chess-clock__lock-indicator {
    margin: 0 0 var(--space-3);
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-align: center;
    overflow-wrap: anywhere;
}

.chess-clock__notice {
    color: var(--color-warning-text);
    background: var(--color-bg-card);
    border-color: var(--color-warning-text);
}

.chess-clock__status {
    color: var(--color-text);
    background: var(--color-bg-alt);
    font-weight: 600;
}

.chess-clock__flag-announcement {
    color: var(--color-error-text);
    background: var(--color-bg-card);
    border-color: var(--color-error-text);
    font-weight: 700;
}

.chess-clock__flag-announcement:empty {
    display: none;
}

.chess-clock__lock-indicator {
    color: var(--color-text);
    background: var(--color-bg-alt);
    font-weight: 600;
}

.chess-clock__panels {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.chess-clock__panel {
    display: flex;
    min-width: 0;
    min-height: 180px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-5);
    color: var(--color-text);
    background: var(--color-bg-alt);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    touch-action: manipulation;
    transition: border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

.chess-clock__panel--white {
    background: var(--color-bg-card);
}

.chess-clock__panel:hover {
    border-color: var(--color-primary);
    background: var(--color-bg-card);
}

.chess-clock__panel:focus-visible,
.chess-clock__button:focus-visible,
.chess-clock__preset-row select:focus-visible,
.chess-clock__field input:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.chess-clock__panel:active,
.chess-clock__button:active {
    transform: scale(0.98);
}

.chess-clock__panel.is-active {
    border-color: var(--color-primary);
    box-shadow: var(--focus-ring);
}

.chess-clock__panel.is-flagged {
    border-color: var(--color-error-text);
    background: var(--color-bg-card);
    transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.chess-clock__panel.is-flagged .chess-clock__panel-state {
    color: var(--color-error-text);
}

.chess-clock__side {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.chess-clock__symbol {
    font-size: var(--font-size-2xl);
    line-height: 1;
}

.chess-clock__time {
    font-family: var(--font-mono);
    font-size: clamp(var(--font-size-3xl), 12vw, 6rem);
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    letter-spacing: 0.02em;
    line-height: var(--line-height-tight);
}

.chess-clock__panel-state {
    min-height: 1.5em;
    font-size: var(--font-size-base);
    font-weight: 600;
    overflow-wrap: anywhere;
}

.chess-clock__settings {
    padding: var(--space-4);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.chess-clock__settings h2 {
    margin: 0 0 var(--space-4);
    font-size: var(--font-size-xl);
}

.chess-clock__preset-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.chess-clock__preset-row label {
    flex: 1 1 100%;
    font-weight: 600;
}

.chess-clock__preset-row select,
.chess-clock__field input {
    min-width: 0;
    min-height: 44px;
    padding: var(--space-2) var(--space-3);
    color: var(--color-text);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font: inherit;
    font-size: var(--font-size-base);
}

.chess-clock__preset-row select:hover:not(:disabled),
.chess-clock__field input:hover:not(:disabled) {
    border-color: var(--color-primary);
}

.chess-clock__preset-row select:active:not(:disabled),
.chess-clock__field input:active:not(:disabled) {
    border-color: var(--color-primary-dark);
}

.chess-clock__preset-row select {
    flex: 1 1 180px;
}

.chess-clock__side-settings {
    min-width: 0;
    margin: 0 0 var(--space-3);
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.chess-clock__side-settings:last-child {
    margin-bottom: 0;
}

.chess-clock__side-settings legend {
    padding: 0 var(--space-2);
    font-weight: 700;
}

.chess-clock__field-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
}

.chess-clock__time-fields {
    display: flex;
    min-width: 0;
    flex-direction: column;
    gap: var(--space-2);
}

.chess-clock__field-group-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    overflow-wrap: anywhere;
}

.chess-clock__time-inputs {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2);
}

.chess-clock__field {
    display: flex;
    min-width: 0;
    flex-direction: column;
    gap: var(--space-1);
}

.chess-clock__field label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    overflow-wrap: anywhere;
}

.chess-clock__field input {
    width: 100%;
}

.chess-clock__field input[aria-invalid="true"] {
    border-color: var(--color-error-text);
}

.chess-clock__field-error {
    min-height: 1.5em;
    color: var(--color-error-text);
    font-size: var(--font-size-sm);
    overflow-wrap: anywhere;
}

.chess-clock__controls {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-4);
}

.chess-clock__button {
    display: inline-flex;
    min-width: 44px;
    min-height: 44px;
    flex: 1 1 auto;
    align-items: center;
    justify-content: center;
    padding: var(--space-2) var(--space-4);
    color: var(--color-text);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font: inherit;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    overflow-wrap: anywhere;
    transition: border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

.chess-clock__button:hover:not(:disabled) {
    border-color: var(--color-primary);
    background: var(--color-bg-card);
}

.chess-clock__button--primary,
.chess-clock__button[aria-pressed="true"] {
    color: var(--color-text-inverse);
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.chess-clock__button--primary:hover:not(:disabled),
.chess-clock__button[aria-pressed="true"]:hover:not(:disabled) {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
}

.chess-clock__button:disabled,
.chess-clock__preset-row select:disabled,
.chess-clock__field input:disabled {
    cursor: not-allowed;
    opacity: 0.65;
}

.chess-clock__dialog {
    position: fixed;
    z-index: 1200;
    inset: 0;
    display: grid;
    place-items: center;
    padding: var(--space-4);
    background: var(--color-overlay);
}

.chess-clock__dialog[hidden] {
    display: none;
}

.chess-clock__dialog-card {
    width: min(100%, 560px);
    padding: var(--space-6);
    color: var(--color-text);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.chess-clock__dialog-card h2 {
    margin-top: 0;
    font-size: var(--font-size-xl);
}

.chess-clock__dialog-card p {
    overflow-wrap: anywhere;
}

.chess-clock__dialog-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.chess-clock__help {
    z-index: 1100;
}

.chess-clock__help[hidden] {
    display: none;
}

.chess-clock .help-close {
    min-width: 44px;
    min-height: 44px;
}

.chess-clock [hidden] {
    display: none !important;
}

@media (max-width: 768px) {
    .chess-clock {
        padding: var(--space-4);
    }

    .chess-clock__panels {
        grid-template-columns: minmax(0, 1fr);
        gap: var(--space-3);
    }

    .chess-clock__panel {
        min-height: 150px;
    }
}

@media (max-width: 480px) {
    .chess-clock {
        padding: var(--space-3);
    }

    .chess-clock__settings {
        padding: var(--space-3);
    }

    .chess-clock__field-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .chess-clock__field input {
        font-size: var(--font-size-base);
    }

    .chess-clock__controls {
        gap: var(--space-2);
    }

    .chess-clock__controls .chess-clock__button {
        flex-basis: calc(50% - var(--space-1));
    }
}

@media (max-width: 768px) {
    .chess-clock-page .nav-container {
        gap: var(--space-3);
    }

    .chess-clock-page .nav-toggle,
    .chess-clock-page #help-toggle {
        box-sizing: border-box;
        flex: 0 0 44px;
        width: 44px;
        height: 44px;
        min-width: 44px;
        min-height: 44px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .chess-clock__panel,
    .chess-clock__button {
        transition: none;
    }
}